hse practice no 6 - simops procedure

GUPCO

HSE Practice No. 6 GOS OFFSHORE SIMULTANEOUS

GOS

Rev # 2

Date: 20/07/01Authorized By: GOS D.D. Gen. Mgr. (Operation) of 18

GOSOffshore

SimultaneousOperations Procedure

C:\Hytham\Procedures\New Safety Manual\GOS OFFSHORE SIMULTINES.doc (6)

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ObjectiveThe objective of this document is to state the limitations under which different operations can be carriedout simultaneously on the GOS platforms

Simultaneous Operations Procedure

The procedures have been structured under headings as follows:OperationGeneral background information concerning the operation.Specific HazardsHazards liable to arise as a result of the operations concerned.Procedures & RestrictionsRestrictions applying to the operation, and specific procedures relating to the interaction of the twooperations 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 2 3 4 5 6 7 8 9 1 1 1 1 1 1 1 1 1 1 2 2 2


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0 1 2 3 4 5 6 7 8 9 0 1 2 1 Drilling Rig Positioning

- x - x x x o x x - - - x x x x x x x o x x

2 Lifts affecting wells

x - o x x o o x o x o o o o o o o o o o o

3 Drilling Ops. - o - o o o o o o o o - o o o o o o x o 4 Flowline Installation

x o o - o o o o o x o o x o o o o o o

5 Pressure & leak testing

x o o o - o o o x o o o o o o x o

6 Instr. El. Work x o o o o - o o o o o o o o o o o 7 Well Prod/Injec. o o o o - 8 Wellhead Maintenance

x o o o o o - o o o o o o o o o o

9 Chemical Injection

x o o o o o o - x o o o o o o o o

10 Explosives Op. - - o x x o o x - o o x o o o x x x x o11 Wireline Op. - - o o o o o o o - - o o o o o o o12 Coil Tubing Op - - - - o o o o o - - o o o o o o o13 Hot Work x x o x o o x o o - o o 0 x14 Scaffolding x o o o o o o o o o o - o15 Painting x o o o o o o o o o o o - o o o16 Grit Blasting x o o o o o o o o o o o - o o x17 Radiography x o o o o o o o x o o o o o o - o o x18 Vessel Operation x o x o o - o o19 Diving x o o o x o o o o -20 Gas Lift o o -21 Emergency Eq. Maint./Repair

x o x x o o x o o o o o o - x

22 Purging x o o o o o x x x o x -


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The terms 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 andsubject 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 InstallationOperation

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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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 WellsOperation

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 flowlinesdepressurized. 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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Drilling OperationsOperation

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 InstallationOperation

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 HotWork 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.


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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.

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 riskfrom falling objects.

Pressure & Leak TestingOperation

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 encompass 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 WorkOperation

This procedure applies only to ‘dead’ electrical work and exclude those works


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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

that the pressure/leak testing has been completed and system or equipment has been depressurized.

Instrument/electrical work will be restricted in terms 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/InjectionOperation

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 personneland uncontrolled release of hydrocarbons. Specifically affecting

production will be heavy lifts overlive 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.


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Wellhead MaintenanceOperation

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.

Procedures & Restrictions All pressure testing in the area of the affected wellhead must

have been completed and the systemor 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 timeas 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 SqueezeOperation

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.


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Procedures & Restriction If access to or egress from the wellhead is restricted in any

way by any other operation, the squeezeshould be suspended until such times as safe and clear access

is available. The area encompassing the adjacent wells is to be barriered

off for the duration of the squeeze, andno other operation is to be permitted within these barriers.

Inhibitor squeezes may be restricted during drilling.

Explosives OperationsOperation

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 orlightning 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 theexplosive device shall be clearly marked out. Only persons authorized by the platform Supervisor shall enter or remain in the


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defined danger area. This area must remain clearly demarcated until the explosives operations are complete.

Withdraw all Hot Work.

Wireline OperationsOperation

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.

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 failureof 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 thewireline 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


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the access to or egress from another work site, or the extent of the barriers encompass 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 OperationsOperation

The types of operations performed with coiled tubing. Each operation involves passing 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. 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 andmade safe.

Diving operations to be restricted below the area deemed by the Area Authority to be at risk from

falling objects.


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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. 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 HotWork must be restricted.

ScaffoldingOperation

A scaffold is defined as a temporary structure on which persons work and which provides support for the materials used in construction, maintenance, repair or demolition work. It can also be used to obtain access to certain areas or equipment.


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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 extendingover 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.

PaintingOperation

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. 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 affectaccess/egress or site hygiene.

Painting in confined spaces requires special precautions and the provision of adequate ventilation or

personal protective equipment.

Grit BlastingOperation

Grit blasting is carried out for the purpose of surface preparation for painting.


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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 machineryif 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

RadiographyOperation

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.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 bythe radiography. If these barriers encompass or ingress into

another worksite, then that job or theradiography must be suspended.

Responsible persons must patrol the barriers at regular intervals to stop unauthorized access.


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Vessel OperationsOperation

All vessel operations within the 500 meter safety zone will only be conducted on the authority of theProduction 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 operationsSpecific 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.

DivingOperation

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.


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- Clearance is to be obtained from the Diving Supervisor prior to any outboard lifts

Commencing.

Gas LiftOperation

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

ط Heavy lifting above Gas Lift piping must be restricted.

Emergency Equipment Maintenance/RepairOperation

ط Any emergency equipment like the Fire Water pumps out of operation due to maintenance or repair etc.Specific Hazards

ط High risk jobs creating a fire without fire pumps in operation.Procedures & Restrictions

ط No hot work open flame (welding) jobs to take place.ط No other critical job that can initiate sparks etc to take place.

Purging Operation

ط Using nitrogen to gas free hydrocarbon pipes.Specific Hazards

ط Hydro carbon gas is intentionally released to atmosphere.Procedures & Restrictions

ط No hot work to take place during purging operations.


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ط All emergency equipment to be operationalط No grit blasting or painting


hse practice no 6 - simops procedure

Documents

gas lift piping

making heavy lifts

specific hazards injury

stop unauthorized access

specific hazards

grit blasting

production manifold

flowline installation