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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Offshore Simultaneous Operations Procedure
C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GOS Rev # 2 Date: 20/07/01 Page 1 of 18
GOS
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS
GUPCO
Rev # 2 Date: 20/07/01 Page 2 of 18
Authorized By: GOS D.D. Gen. Mgr. (Operation)
Objective The objective of this document is to state the limitations under which different operations can be carried out simultaneously on the GOS platforms Simultaneous Operations Procedure The procedures have been structured under headings as follows: Operation General background information concerning the operation. Specific Hazards Hazards liable to arise as a result of the operations concerned. Procedures & Restrictions Restrictions applying to the operation, and specific procedures relating to the interaction of the two operations being carried out simultaneously. The ‘Simultaneous Activities Matrix’ summarizes the activities associated with simultaneous operations. For each procedure that follows, the appropriate part of the matrix is reproduced.
1 Drilling Rig Positioning 2 Lifts affecting wells
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GOS
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS
GUPCO
Rev # 2 Date: 20/07/01 Page 3 of 18
Authorized By: GOS D.D. Gen. Mgr. (Operation) 3 Drilling Ops. 4 Flowline Installation 5 Pressure & leak testing 6 Instr. El. Work 7 Well Prod/Injec. 8 Wellhead Maintenance 9 Chemical Injection 10 Explosives Op. 11 Wireline Op. 12 Coil Tubing Op 13 Hot Work 14 Scaffolding 15 Painting 16 Grit Blasting 17 Radiography 18 Vessel Operation 19 Diving 20 Gas Lift 21 Emergency Eq. Maint./Repair 22 Purging
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 4 of 18
The used in the matrix are as follows: Not Applicable (-) Two operations that cannot physically be carried out simultaneously due to the configuration of the platform. Allowed Subject to Permit Restrictions ( ) This is to be treated as normal work on the platform and will require a permit to work to be raised and subject to normal observances and precautions. Restricted (o) Operations that may only take place simultaneously provided certain conditions have been met. Risk Assessment might be the tool to identify the required precautions. Not Permitted (x) Operations not to be undertaken simultaneously. Drilling Rig Installation Operation This operation involves the movement of a drilling rig approaching a satellite or Complex drilling platform. This is required to drill a new well or perform workover on a platform. Specific Hazards The positioning of a drilling rig above a satellite or Complex platform is a critical operation. The drilling rig is much heavier and bigger than a satellite and the possibility of objects falling or bumping into each other is high. Rig move Risk Assessment to be completed before Rig approach or begging work with, O/P, Marian, Drilling and any other Dept. involved. Procedures & Restrictions If on a drilling platform the area has to be barriered off from unauthorized personnel. No operation shall take place on the satellite or drilling platform during this operation. No other operation than production may continue. The drilling platform must be barriered off. Skidding Derrick
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
Operation This operation involves the movement of the drilling derrick over the satellite helideck deck or drilling platform. This is required when work requiring the derrick on one well is complete and when work on another well, requiring the derrick, is to be started, or for maintenance or access purposes. Specific Hazards The moving of heavy equipment above hydrocarbon filled facilities, and the possibility of objects falling onto the decks below, and/or into the sea. Procedures & Restrictions If on a drilling platform the area has to be barriered off from unauthorized personnel. No operation shall take place on or above the deck under the path of the skidding rig. No operations other than production may continue Lifts Affecting Wells Operation This procedure covers the moving of a heavy piece of equipment, for example a Xmas tree, the wellhead or conductor, below or through the wellbay deck. Specific Hazards Damage to flowlines or pipework under pressure or containing well fluids during equipment handling. Endangering diving operations by dropped objects. Injury to personnel. Damage to gas lift flowlines under pressure. Procedures & Restrictions All work on affected wells is to cease. All wells considered to be at risk to be shut in as and the relevant flowlines depressurized. Cold work permit for heavy lift operation will only be issued after the Production Supervisor has confirmed that the wells have been shut in and the flowlines depressurized as required. If risk is apparent, ensure diving operations have been completed and the divers returned to the bell.
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GOS Rev # 2 Date: 20/07/01 Page 5 of 18
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 6 of 18
Drilling Operations Operation Drilling Operation covers all modes of drilling, during well control, drilling in the reservoir and normal drilling. Specific Hazards Shallow gas encounter risk. Release of hydrocarbons. Drilling in the reservoir. Injury to personnel. Procedures & Restrictions No Hot Work operations will be allowed during abnormal drilling operations (as listed under specific hazards above). Wells considered to be at risk of collision are to be made secure. Should the drilling phase reach the point where primary well control has been lost, then the production and all other work on the platform must stop. Flowline Installation Operation Once a well is ready to be connected to the platform system, the flowline spool must be fitted, making the final connection from the tree to the production manifold. Specific Hazards Hot Work may be required in the well area. Procedures & Restrictions No operation allowed on adjacent wells. If drilling is in the critical phase, Hot Work restrictions are imposed. Suspend the following operations that may be ongoing on any wells for the duration of the Hot Work required for the flowline installations: Wellhead maintenance Scale inhibitor squeeze operation Withdraw all Hot Work permits in force on the Platform other than those required for flowline installation. Scaffold erection/striking, painting, grit blasting and radiography may continue provided access to or egress from their worksite is not affected by the area affected by the flowline installation.
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 7 of 18
The DHSV on the affected well to be closed and tested for PBU, and the well prepared for flowline installation as per the detailed procedures. No diving operation to be undertaken below the area deemed by the Area Authority to be at risk from falling objects. Pressure & Leak Testing Operation Pressure and leak testing, where possible, will be limited to hydraulic testing. Specific Hazards Injury to personnel following failure of equipment under test. Procedures & Restrictions Before allowing a pressure or leak test to be undertaken, the Area Authority must ensure that all work in the vicinity of the test is stopped and the permits withdrawn. Erect barriers at a safe distance from the pressure test. If these barriers affect the access to or egress from another work site, or the extent of the barriers encom another job site then that job must be suspended until after the completion of the pressure or leak test. Ensure that responsible persons patrol the barriers at regular intervals to stop unauthorized access. Make regular PA announcements warning unauthorized personnel to stay clear of the pressure test area. Instrument Electrical Work Operation This procedure applies only to ‘dead’ electrical work and exclude those works requiring a Hot Work (Spark Potential) Permit. Specific Hazards Injury to personnel due to failure of equipment under test. Procedures & Restrictions Prior to allowing instrument/electrical work on pressure vessels, the Area Authority is to ensure
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 8 of 18
that the pressure/leak testing has been completed and system or equipment has been depressurized. Instrument/electrical work will be restricted in of being performed simultaneously with any other work when access to or egress from the site of the instrument/electrical work is affected by the extent of the other work. Well Production/Injection Operation Production via the Xmas trees and flowlines to the production manifold of formation fluids, and injection from the water injection manifold through flowlines to the injection Xmas trees of treated seawater. Specific Hazards Uncontrolled release of hydrocarbons may result if a well being drilled intersects an on line producing well. Failure of lifting gear when making heavy lifts over live plant could result in injury to personnel and uncontrolled release of hydrocarbons. Specifically affecting production will be heavy lifts over live flowlines and trees. Procedures & Restrictions Wells considered to be at risk of collision are to be made secure. Wells at risk due to overhead heavy lifts are to be shut in and isolated. Wellhead Maintenance Operation This procedure refers to any operation involving work on the wellhead. Specific Hazards Any release of hydrocarbons presents a risk of fire/explosion if a source of ignition exists. Any release of well fluids presents an additional hazard to personnel in the area of the leak due to its H 2 S content. Injury to personnel from failure of equipment under test. C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 9 of 18
Procedures & Restrictions All pressure testing in the area of the affected wellhead must have been completed and the system or equipment depressurized before the wellhead maintenance is allowed to commence or continue. No Hot Work in the wellbay area will be allowed. No heavy lift will be allowed in the area of the wellhead being worked on. No other operation (for example wireline operations) will be permitted on the well at the same time as the well head maintenance is being performed. If access to or egress from the wellhead being maintained is affected by any other operation, one of either of the operations will be suspended. Scale Inhibitor Squeeze Operation At regular intervals, each production well will be treated with chemicals to avoid, as far as possible, the formation of scale. This treatment is referred to as ‘Squeeze’ treatment and consists primarily of injecting a mixture of scale inhibitor and sea water into the production wells. Specific Hazards Injury to personnel following failure of equipment under pressure. Hazard to personnel involved in the handling of chemicals. Procedures & Restriction If access to or egress from the wellhead is restricted in any way by any other operation, the squeeze should be suspended until such times as safe and clear access is available. The area encoming the adjacent wells is to be barriered off for the duration of the squeeze, and no other operation is to be permitted within these barriers. Inhibitor squeezes may be restricted during drilling.
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 10 of 18
Explosives Operations Operation The operation that require the use of explosives is related to well perforations. In all cases, the explosives are run into the hole on electric line. Detonation will be electrical, initiated at the surface. Either conventional explosives or explosives using Schlumberger’s SAFE equipment may be utilized. Specific Hazards Premature detonation of explosive charge whilst using conventional explosives. Procedure & Restrictions (Conventional Explosives). Radio silence to be imposed. Operations relying on radio communication to be suspended or postponed. Work involving the use of explosives must not be carried out under conditions of thunder or lightning and may be restricted during high winds. Withdraw all Hot Works. Procedures & Restrictions (SAFE Equipment) Use of equipment featuring SAFE will only be permitted subject to the following restrictions: Work involving the use of explosives may be restricted during high winds. The area in which there may be a risk to persons or plant from premature detonation of the explosive device shall be clearly marked out. Only persons authorized by the platform Supervisor shall enter or remain in the defined danger area. This area must remain clearly demarcated until the explosives operations are complete. Withdraw all Hot Work. Wireline Operations Operation Wireline operations, as described in this procedure, refer to any operation which involves the lowering of a tool or device into a well on either slickline or electric line. Electric line and slickline work can take place through the Helideck on Satellites and weather deck on drilling platforms. On drilling rigs it is performed from the drill floor.
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 11 of 18
All wireline work on a live well will take place using pressure control equipment to enable entry of the tool or device into the well without release of well fluids. Specific Hazards Potential for release of well fluids and subsequent fire hazard should failure of pressure control equipment occur. Injury to personnel from wireline breakage under tension. Damage to well/completion integrity should wireline part. Injury to personnel from failure of equipment under test. Procedures & Restrictions All Hot Work liable to present a source of ignition to a leak of hydrocarbons as a result of failure of or damage to any part of the equipment associated with the wireline work to be withdrawn. All work within an area judged by the Area Authority to be at risk due to its proximity to the wireline operation to be suspended. No lifts of any kind to be made above the wireline once it is under tension. When lifting the wireline hatch covers, and installing the lubricator and riser, specific precautions to be taken. Barriers and signs to be erected warning personnel of the wireline operations. If these barriers affect the access to or egress from another work site, or the extent of the barriers encom another job site then that job must be suspended until after the completion of the pressure or leak test. No diving operation to be undertaken below the area deemed by the Area Authority to be at risk from falling objects. Coiled Tubing Operations Operation The types of operations performed with coiled tubing. Each operation involves ing small bore tubing through an injector head attached to a lubricator which is attached to the wellhead. The rig up of this equipment involves heavy lifting operations. Specific Hazards Inadvertent release of hydrocarbons. C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
Injury to personnel following failure of equipment under pressure. Hazard to personnel involved in the handling of chemicals. Hazard to personnel or equipment underneath the coiled tubing operation due to failure of equipment causing a spillage of chemical. Risk of damage to equipment or injury to personnel during rig up operations. Release of chemicals/hydrocarbons should damage occur to the tubing whilst it is in service. Procedures & Restriction Restrictions will be imposed on Hot Work as advised by the Area Authority. No operation to be undertaken beneath the coiled tubing operation that could be at risk should a spillage of chemical or nitrogen occur. All wells considered to be at risk due to the heavy lifts involved during rig up to be shut in and made safe. Diving operations to be restricted below the area deemed by the Area Authority to be at risk from falling objects. No lifts of any kind to be made above the coiled tubing spread once it is in service. Hot Work Operation Hot Works are defined as those requiring a Hot Works, Naked Flame and Spark Potential Permit. In this section, Hot Work in that area of the platform that will directly affect well related is addressed. Specific Hazards On a production platform any source of ignition presents a potential explosion/fire hazard. Procedures & Restrictions Before allowing Hot Work to commence, ensure that the area where the work is being undertaken is gas-free, and stop all operations liable to give rise to a hydrocarbon release. If necessary, the area should be washed down to remove traces of oil or grease.
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
Due to the increased risk of hydrocarbon release associated with the following operations, consideration will have to be given to restricting them for the duration of the Hot Work: Coiled tubing operations Wireline operations Wellhead maintenance Due to the flammable nature of the solvents associated with painting, painting in proximity to Hot Work must be restricted. Scaffolding Operation A scaffold is defined as a temporary structure on which persons work and which provides for the materials used in construction, maintenance, repair or demolition work. It can also be used to obtain access to certain areas or equipment. Specific Hazards Endangering diving operations when constructing or dismantling scaffolding over the side of the platform Injuries Procedures & Restrictions Diving operations must cease during the period of construction or destruction of scaffold extending over the side of the platform. Scaffolding operations can generally be restricted by their proximity to other ongoing work. For example, scaffold operations are not permitted on any well adjacent to one being worked on.
Painting Operation Application of paint to all surfaces throughout the entire platform. Specific Hazards The flammable nature of the solvents used during the painting process give rise to a potential fire hazard.
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
The toxicity of some paints or solvents can affect personnel in the vicinity of the worksite. Procedures & Restriction Painting in proximity to Hot Work must be restricted. Painting will be restricted by the physical encroachment of other operations which affect access/egress or site hygiene. Painting in confined spaces requires special precautions and the provision of adequate ventilation or personal protective equipment.
Grit Blasting Operation Grit blasting is carried out for the purpose of surface preparation for painting. Specific Hazards Grit blasting is a possible source of ignition. The materials used during grit blasting are abrasive and will cause damage to systems or machinery if ingress is allowed to occur. Injury to personnel due to flying grit. Procedures & Restrictions When reviewing an application for grit blasting operations, the Area Authority must consider restricting the following activities or restricting grit blasting in their vicinity: Wireline operations Coiled tubing operations Flowline installation Wellhead maintenance Painting Radiography Operation Radiography is a method used to evaluate the integrity of material welds, and involves the exposure of a radioactive source. As a result restrictions are imposed on all operations that are being performed within the field of exposure of the source.
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 15 of 18
Specific Hazards Exposure of personnel to radiation doses above a safe level. Procedures & Restrictions Before allowing radiography to be undertaken, the Area Authority must ensure that all work in the vicinity of the radiography is stopped and permits withdrawn. The HSE advisor in conjunction with the Performing Authority will barrier off the area affected by the radiography. If these barriers encom or ingress into another worksite, then that job or the radiography must be suspended. Responsible persons must patrol the barriers at regular intervals to stop unauthorized access.
Vessel Operations Operation All vessel operations within the 500 meter safety zone will only be conducted on the authority of the Production Supervisor. The master of the vessel remains responsible for the safety of his crew and the vessel. The Production Supervisor will co-ordinate all vessel operations Specific Hazards Vessel operations can present a hazard to diving operations. Procedures & Restrictions Vessels entering the 500 meter safety zone while divers are in the water should be notified regarding the location of the diving operation and areas of prohibited vessel operation. Once a vessel enters the 500 meter safety zone, smoking is to be prohibited on the open deck of the vessel, and any work liable to give rise to a source of ignition to hydrocarbon gas is to cease.
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
Diving Operation Diving operations will be required at regular intervals for inspection purposes, for the platform structure and the gas export line sub-sea isolation valve. Specific Hazards Divers in the water are at risk from falling objects, discharges or vessel movements. Procedures & Restrictions Scaffold work over the side of the platform to be suspended while diving operations are in progress. Diving operations must not coincide with drilling or well activities that involve lifting of objects which may be dropped into the water. Outboard crane operations are restricted during diving. Clearance is to be obtained from the Diving Supervisor prior to any outboard lifts Commencing.
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Gas Lift Operation Production wells will be considered for gas lift as their production rate decreases and water out increases. Specific Hazards Uncontrolled release of hydrocarbons may result if a well being drilled intersects an online gas lift well. Failure of lifting gear when making heavy lifts in vicinity of gas lift piping. Rigging of wireline/coil tubing equipment on wells adjacent to gas lift manifold. Potential dropped objects during drilling rig positioning operations. Procedures & Restrictions Heavy lifting above Gas Lift piping must be restricted.
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
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Emergency Equipment Maintenance/Repair Operation Any emergency equipment like the Fire Water pumps out of operation due to maintenance or repair etc. Specific Hazards High risk jobs creating a fire without fire pumps in operation. Procedures & Restrictions No hot work open flame (welding) jobs to take place. No other critical job that can initiate sparks etc to take place. Purging Operation Using nitrogen to gas free hydrocarbon pipes. Specific Hazards Hydro carbon gas is intentionally released to atmosphere. Procedures & Restrictions No hot work to take place during purging operations. All emergency equipment to be operational No grit blasting or painting
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HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Offshore Simultaneous Operations Procedure
C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GOS Rev # 2 Date: 20/07/01 Page 1 of 18
GOS
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS
GUPCO
Rev # 2 Date: 20/07/01 Page 2 of 18
Authorized By: GOS D.D. Gen. Mgr. (Operation)
Objective The objective of this document is to state the limitations under which different operations can be carried out simultaneously on the GOS platforms Simultaneous Operations Procedure The procedures have been structured under headings as follows: Operation General background information concerning the operation. Specific Hazards Hazards liable to arise as a result of the operations concerned. Procedures & Restrictions Restrictions applying to the operation, and specific procedures relating to the interaction of the two operations being carried out simultaneously. The ‘Simultaneous Activities Matrix’ summarizes the activities associated with simultaneous operations. For each procedure that follows, the appropriate part of the matrix is reproduced.
1 Drilling Rig Positioning 2 Lifts affecting wells
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GOS
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS
GUPCO
Rev # 2 Date: 20/07/01 Page 3 of 18
Authorized By: GOS D.D. Gen. Mgr. (Operation) 3 Drilling Ops. 4 Flowline Installation 5 Pressure & leak testing 6 Instr. El. Work 7 Well Prod/Injec. 8 Wellhead Maintenance 9 Chemical Injection 10 Explosives Op. 11 Wireline Op. 12 Coil Tubing Op 13 Hot Work 14 Scaffolding 15 Painting 16 Grit Blasting 17 Radiography 18 Vessel Operation 19 Diving 20 Gas Lift 21 Emergency Eq. Maint./Repair 22 Purging
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 4 of 18
The used in the matrix are as follows: Not Applicable (-) Two operations that cannot physically be carried out simultaneously due to the configuration of the platform. Allowed Subject to Permit Restrictions ( ) This is to be treated as normal work on the platform and will require a permit to work to be raised and subject to normal observances and precautions. Restricted (o) Operations that may only take place simultaneously provided certain conditions have been met. Risk Assessment might be the tool to identify the required precautions. Not Permitted (x) Operations not to be undertaken simultaneously. Drilling Rig Installation Operation This operation involves the movement of a drilling rig approaching a satellite or Complex drilling platform. This is required to drill a new well or perform workover on a platform. Specific Hazards The positioning of a drilling rig above a satellite or Complex platform is a critical operation. The drilling rig is much heavier and bigger than a satellite and the possibility of objects falling or bumping into each other is high. Rig move Risk Assessment to be completed before Rig approach or begging work with, O/P, Marian, Drilling and any other Dept. involved. Procedures & Restrictions If on a drilling platform the area has to be barriered off from unauthorized personnel. No operation shall take place on the satellite or drilling platform during this operation. No other operation than production may continue. The drilling platform must be barriered off. Skidding Derrick
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
Operation This operation involves the movement of the drilling derrick over the satellite helideck deck or drilling platform. This is required when work requiring the derrick on one well is complete and when work on another well, requiring the derrick, is to be started, or for maintenance or access purposes. Specific Hazards The moving of heavy equipment above hydrocarbon filled facilities, and the possibility of objects falling onto the decks below, and/or into the sea. Procedures & Restrictions If on a drilling platform the area has to be barriered off from unauthorized personnel. No operation shall take place on or above the deck under the path of the skidding rig. No operations other than production may continue Lifts Affecting Wells Operation This procedure covers the moving of a heavy piece of equipment, for example a Xmas tree, the wellhead or conductor, below or through the wellbay deck. Specific Hazards Damage to flowlines or pipework under pressure or containing well fluids during equipment handling. Endangering diving operations by dropped objects. Injury to personnel. Damage to gas lift flowlines under pressure. Procedures & Restrictions All work on affected wells is to cease. All wells considered to be at risk to be shut in as and the relevant flowlines depressurized. Cold work permit for heavy lift operation will only be issued after the Production Supervisor has confirmed that the wells have been shut in and the flowlines depressurized as required. If risk is apparent, ensure diving operations have been completed and the divers returned to the bell.
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GOS Rev # 2 Date: 20/07/01 Page 5 of 18
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 6 of 18
Drilling Operations Operation Drilling Operation covers all modes of drilling, during well control, drilling in the reservoir and normal drilling. Specific Hazards Shallow gas encounter risk. Release of hydrocarbons. Drilling in the reservoir. Injury to personnel. Procedures & Restrictions No Hot Work operations will be allowed during abnormal drilling operations (as listed under specific hazards above). Wells considered to be at risk of collision are to be made secure. Should the drilling phase reach the point where primary well control has been lost, then the production and all other work on the platform must stop. Flowline Installation Operation Once a well is ready to be connected to the platform system, the flowline spool must be fitted, making the final connection from the tree to the production manifold. Specific Hazards Hot Work may be required in the well area. Procedures & Restrictions No operation allowed on adjacent wells. If drilling is in the critical phase, Hot Work restrictions are imposed. Suspend the following operations that may be ongoing on any wells for the duration of the Hot Work required for the flowline installations: Wellhead maintenance Scale inhibitor squeeze operation Withdraw all Hot Work permits in force on the Platform other than those required for flowline installation. Scaffold erection/striking, painting, grit blasting and radiography may continue provided access to or egress from their worksite is not affected by the area affected by the flowline installation.
C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 7 of 18
The DHSV on the affected well to be closed and tested for PBU, and the well prepared for flowline installation as per the detailed procedures. No diving operation to be undertaken below the area deemed by the Area Authority to be at risk from falling objects. Pressure & Leak Testing Operation Pressure and leak testing, where possible, will be limited to hydraulic testing. Specific Hazards Injury to personnel following failure of equipment under test. Procedures & Restrictions Before allowing a pressure or leak test to be undertaken, the Area Authority must ensure that all work in the vicinity of the test is stopped and the permits withdrawn. Erect barriers at a safe distance from the pressure test. If these barriers affect the access to or egress from another work site, or the extent of the barriers encom another job site then that job must be suspended until after the completion of the pressure or leak test. Ensure that responsible persons patrol the barriers at regular intervals to stop unauthorized access. Make regular PA announcements warning unauthorized personnel to stay clear of the pressure test area. Instrument Electrical Work Operation This procedure applies only to ‘dead’ electrical work and exclude those works requiring a Hot Work (Spark Potential) Permit. Specific Hazards Injury to personnel due to failure of equipment under test. Procedures & Restrictions Prior to allowing instrument/electrical work on pressure vessels, the Area Authority is to ensure
C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 8 of 18
that the pressure/leak testing has been completed and system or equipment has been depressurized. Instrument/electrical work will be restricted in of being performed simultaneously with any other work when access to or egress from the site of the instrument/electrical work is affected by the extent of the other work. Well Production/Injection Operation Production via the Xmas trees and flowlines to the production manifold of formation fluids, and injection from the water injection manifold through flowlines to the injection Xmas trees of treated seawater. Specific Hazards Uncontrolled release of hydrocarbons may result if a well being drilled intersects an on line producing well. Failure of lifting gear when making heavy lifts over live plant could result in injury to personnel and uncontrolled release of hydrocarbons. Specifically affecting production will be heavy lifts over live flowlines and trees. Procedures & Restrictions Wells considered to be at risk of collision are to be made secure. Wells at risk due to overhead heavy lifts are to be shut in and isolated. Wellhead Maintenance Operation This procedure refers to any operation involving work on the wellhead. Specific Hazards Any release of hydrocarbons presents a risk of fire/explosion if a source of ignition exists. Any release of well fluids presents an additional hazard to personnel in the area of the leak due to its H 2 S content. Injury to personnel from failure of equipment under test. C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 9 of 18
Procedures & Restrictions All pressure testing in the area of the affected wellhead must have been completed and the system or equipment depressurized before the wellhead maintenance is allowed to commence or continue. No Hot Work in the wellbay area will be allowed. No heavy lift will be allowed in the area of the wellhead being worked on. No other operation (for example wireline operations) will be permitted on the well at the same time as the well head maintenance is being performed. If access to or egress from the wellhead being maintained is affected by any other operation, one of either of the operations will be suspended. Scale Inhibitor Squeeze Operation At regular intervals, each production well will be treated with chemicals to avoid, as far as possible, the formation of scale. This treatment is referred to as ‘Squeeze’ treatment and consists primarily of injecting a mixture of scale inhibitor and sea water into the production wells. Specific Hazards Injury to personnel following failure of equipment under pressure. Hazard to personnel involved in the handling of chemicals. Procedures & Restriction If access to or egress from the wellhead is restricted in any way by any other operation, the squeeze should be suspended until such times as safe and clear access is available. The area encoming the adjacent wells is to be barriered off for the duration of the squeeze, and no other operation is to be permitted within these barriers. Inhibitor squeezes may be restricted during drilling.
C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 10 of 18
Explosives Operations Operation The operation that require the use of explosives is related to well perforations. In all cases, the explosives are run into the hole on electric line. Detonation will be electrical, initiated at the surface. Either conventional explosives or explosives using Schlumberger’s SAFE equipment may be utilized. Specific Hazards Premature detonation of explosive charge whilst using conventional explosives. Procedure & Restrictions (Conventional Explosives). Radio silence to be imposed. Operations relying on radio communication to be suspended or postponed. Work involving the use of explosives must not be carried out under conditions of thunder or lightning and may be restricted during high winds. Withdraw all Hot Works. Procedures & Restrictions (SAFE Equipment) Use of equipment featuring SAFE will only be permitted subject to the following restrictions: Work involving the use of explosives may be restricted during high winds. The area in which there may be a risk to persons or plant from premature detonation of the explosive device shall be clearly marked out. Only persons authorized by the platform Supervisor shall enter or remain in the defined danger area. This area must remain clearly demarcated until the explosives operations are complete. Withdraw all Hot Work. Wireline Operations Operation Wireline operations, as described in this procedure, refer to any operation which involves the lowering of a tool or device into a well on either slickline or electric line. Electric line and slickline work can take place through the Helideck on Satellites and weather deck on drilling platforms. On drilling rigs it is performed from the drill floor.
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GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 11 of 18
All wireline work on a live well will take place using pressure control equipment to enable entry of the tool or device into the well without release of well fluids. Specific Hazards Potential for release of well fluids and subsequent fire hazard should failure of pressure control equipment occur. Injury to personnel from wireline breakage under tension. Damage to well/completion integrity should wireline part. Injury to personnel from failure of equipment under test. Procedures & Restrictions All Hot Work liable to present a source of ignition to a leak of hydrocarbons as a result of failure of or damage to any part of the equipment associated with the wireline work to be withdrawn. All work within an area judged by the Area Authority to be at risk due to its proximity to the wireline operation to be suspended. No lifts of any kind to be made above the wireline once it is under tension. When lifting the wireline hatch covers, and installing the lubricator and riser, specific precautions to be taken. Barriers and signs to be erected warning personnel of the wireline operations. If these barriers affect the access to or egress from another work site, or the extent of the barriers encom another job site then that job must be suspended until after the completion of the pressure or leak test. No diving operation to be undertaken below the area deemed by the Area Authority to be at risk from falling objects. Coiled Tubing Operations Operation The types of operations performed with coiled tubing. Each operation involves ing small bore tubing through an injector head attached to a lubricator which is attached to the wellhead. The rig up of this equipment involves heavy lifting operations. Specific Hazards Inadvertent release of hydrocarbons. C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
Injury to personnel following failure of equipment under pressure. Hazard to personnel involved in the handling of chemicals. Hazard to personnel or equipment underneath the coiled tubing operation due to failure of equipment causing a spillage of chemical. Risk of damage to equipment or injury to personnel during rig up operations. Release of chemicals/hydrocarbons should damage occur to the tubing whilst it is in service. Procedures & Restriction Restrictions will be imposed on Hot Work as advised by the Area Authority. No operation to be undertaken beneath the coiled tubing operation that could be at risk should a spillage of chemical or nitrogen occur. All wells considered to be at risk due to the heavy lifts involved during rig up to be shut in and made safe. Diving operations to be restricted below the area deemed by the Area Authority to be at risk from falling objects. No lifts of any kind to be made above the coiled tubing spread once it is in service. Hot Work Operation Hot Works are defined as those requiring a Hot Works, Naked Flame and Spark Potential Permit. In this section, Hot Work in that area of the platform that will directly affect well related is addressed. Specific Hazards On a production platform any source of ignition presents a potential explosion/fire hazard. Procedures & Restrictions Before allowing Hot Work to commence, ensure that the area where the work is being undertaken is gas-free, and stop all operations liable to give rise to a hydrocarbon release. If necessary, the area should be washed down to remove traces of oil or grease.
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GOS Rev # 2 Date: 20/07/01 Page 12 of 18
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
Due to the increased risk of hydrocarbon release associated with the following operations, consideration will have to be given to restricting them for the duration of the Hot Work: Coiled tubing operations Wireline operations Wellhead maintenance Due to the flammable nature of the solvents associated with painting, painting in proximity to Hot Work must be restricted. Scaffolding Operation A scaffold is defined as a temporary structure on which persons work and which provides for the materials used in construction, maintenance, repair or demolition work. It can also be used to obtain access to certain areas or equipment. Specific Hazards Endangering diving operations when constructing or dismantling scaffolding over the side of the platform Injuries Procedures & Restrictions Diving operations must cease during the period of construction or destruction of scaffold extending over the side of the platform. Scaffolding operations can generally be restricted by their proximity to other ongoing work. For example, scaffold operations are not permitted on any well adjacent to one being worked on.
Painting Operation Application of paint to all surfaces throughout the entire platform. Specific Hazards The flammable nature of the solvents used during the painting process give rise to a potential fire hazard.
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GOS Rev # 2 Date: 20/07/01 Page 13 of 18
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
The toxicity of some paints or solvents can affect personnel in the vicinity of the worksite. Procedures & Restriction Painting in proximity to Hot Work must be restricted. Painting will be restricted by the physical encroachment of other operations which affect access/egress or site hygiene. Painting in confined spaces requires special precautions and the provision of adequate ventilation or personal protective equipment.
Grit Blasting Operation Grit blasting is carried out for the purpose of surface preparation for painting. Specific Hazards Grit blasting is a possible source of ignition. The materials used during grit blasting are abrasive and will cause damage to systems or machinery if ingress is allowed to occur. Injury to personnel due to flying grit. Procedures & Restrictions When reviewing an application for grit blasting operations, the Area Authority must consider restricting the following activities or restricting grit blasting in their vicinity: Wireline operations Coiled tubing operations Flowline installation Wellhead maintenance Painting Radiography Operation Radiography is a method used to evaluate the integrity of material welds, and involves the exposure of a radioactive source. As a result restrictions are imposed on all operations that are being performed within the field of exposure of the source.
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GOS Rev # 2 Date: 20/07/01 Page 14 of 18
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
GOS Rev # 2 Date: 20/07/01 Page 15 of 18
Specific Hazards Exposure of personnel to radiation doses above a safe level. Procedures & Restrictions Before allowing radiography to be undertaken, the Area Authority must ensure that all work in the vicinity of the radiography is stopped and permits withdrawn. The HSE advisor in conjunction with the Performing Authority will barrier off the area affected by the radiography. If these barriers encom or ingress into another worksite, then that job or the radiography must be suspended. Responsible persons must patrol the barriers at regular intervals to stop unauthorized access.
Vessel Operations Operation All vessel operations within the 500 meter safety zone will only be conducted on the authority of the Production Supervisor. The master of the vessel remains responsible for the safety of his crew and the vessel. The Production Supervisor will co-ordinate all vessel operations Specific Hazards Vessel operations can present a hazard to diving operations. Procedures & Restrictions Vessels entering the 500 meter safety zone while divers are in the water should be notified regarding the location of the diving operation and areas of prohibited vessel operation. Once a vessel enters the 500 meter safety zone, smoking is to be prohibited on the open deck of the vessel, and any work liable to give rise to a source of ignition to hydrocarbon gas is to cease.
C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
Diving Operation Diving operations will be required at regular intervals for inspection purposes, for the platform structure and the gas export line sub-sea isolation valve. Specific Hazards Divers in the water are at risk from falling objects, discharges or vessel movements. Procedures & Restrictions Scaffold work over the side of the platform to be suspended while diving operations are in progress. Diving operations must not coincide with drilling or well activities that involve lifting of objects which may be dropped into the water. Outboard crane operations are restricted during diving. Clearance is to be obtained from the Diving Supervisor prior to any outboard lifts Commencing.
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Gas Lift Operation Production wells will be considered for gas lift as their production rate decreases and water out increases. Specific Hazards Uncontrolled release of hydrocarbons may result if a well being drilled intersects an online gas lift well. Failure of lifting gear when making heavy lifts in vicinity of gas lift piping. Rigging of wireline/coil tubing equipment on wells adjacent to gas lift manifold. Potential dropped objects during drilling rig positioning operations. Procedures & Restrictions Heavy lifting above Gas Lift piping must be restricted.
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GOS Rev # 2 Date: 20/07/01 Page 16 of 18
GUPCO
HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS Authorized By: GOS D.D. Gen. Mgr. (Operation)
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Emergency Equipment Maintenance/Repair Operation Any emergency equipment like the Fire Water pumps out of operation due to maintenance or repair etc. Specific Hazards High risk jobs creating a fire without fire pumps in operation. Procedures & Restrictions No hot work open flame (welding) jobs to take place. No other critical job that can initiate sparks etc to take place. Purging Operation Using nitrogen to gas free hydrocarbon pipes. Specific Hazards Hydro carbon gas is intentionally released to atmosphere. Procedures & Restrictions No hot work to take place during purging operations. All emergency equipment to be operational No grit blasting or painting
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GOS Rev # 2 Date: 20/07/01 Page 17 of 18
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