DOP 206 - Rev 4

Maintenance Document No.

Document Title

DOP 206

Maintenance

Page Rev No Date Doc No

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1 of 11 4 06.04.00 DOP 206

TABLE OF CONTENTS

1.0 2.0 3.0 4.0 5.0

PURPOSE................................................................................................... 2 SCOPE........................................................................................................ 2 RESPONSIBILITIES................................................................................... 2 DEFINITIONS............................................................................................ 2 PROCEDURE............................................................................................. 2

5.1 5.2 5.3 5.4 5.5 5.6

Daily.................................................................................................................... 2 Weekly................................................................................................................ 3 Monthly............................................................................................................... 3 Drilling Line.......................................................................................................... 3 Drill String............................................................................................................ 5 Drawworks Brakes and Emergency Systems...................................................... 7

6.0 7.0

Rev No 2 3 4

REFERENCES............................................................................................ 8 ENCLOSURES.......................................................................................... 8

Date 17.04.9 7 23.03.9 9 06.04.0 0

Prepared by: BNO

Verified by: ICO

Approved by: Managing Director AJE

IMI / LVA

ICO

AJE / BNO

KCA

ICO

AJE / BNO

G:\Management Library\Drilling Operations Manual\DOP 200\DOP 206

Reason for Revision As Per Rev. Request No. 04 As per Procedural Review Scheme As per Revision Request No. 002/00

Maintenance 1.0


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PURPOSE The purpose of this procedure is to give guidance on maintenance of the most common drilling equipment.

2.0

SCOPE This procedure applies to all Stena Drilling’s units.

3.0

RESPONSIBILITIES

3.1

Senior Toolpusher The Senior Toolpusher is responsible for the implementation of this procedure.

4.0

DEFINITIONS Ref DOP 208.

5.0

PROCEDURE

5.1

Daily

5.1.1

Derrick Equipment

5.1.2

•

Visual inspection and lubrication according to planned maintenance system (PMS) and manufacturers’ recommendations.

•

Visual inspection to identify potential safety hazards e.g. loose bolts, debris in beams and secure/remove same. To be carried out according to the Derrick Inspection Form.

Drill Floor Equipment •

5.1.3

Visual inspection and lubrication according to PMS and manufacturers’ recommendations.

Mud System •


•

Visual inspection of all mudlines/transfer lines to check for leaks-(Ref. Oil Base Muds/Completion Fluids.


Maintenance 5.1.4

5.2

5.3


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BOP System / Sub Sea Equipment •


•

Visual inspection of marine riser and riser angle relative to BOPs using SSTV or ROV (where available). Check bullseye positions on PGB, BOPS, LMRP, riser/flex joint. These along with accoustic hole positioning system are to be logged on IADC Report and the Company Daily Drilling Report.

Weekly •

According to computerised PM system.

•

Carry out Weekly Rig Inspection as per Weekly Report (Ref. Rig Specific Work methods).

Monthly According to computerised PM system.

5.4

Drilling Line

5.4.1

Introduction Slipping and Cutting Philosophy Drilling line is periodically slipped through the reeving system to distribute wear more uniformly along the length of the rope. The heaviest wear occurs on the critical wear points which are in the following locations: •

Pick up points (pulling out of hole).

•

Pick up points (running in hole).

•

Cross-over points on the drum.

Points Of Critical Wear The critical points on the line suffer heavy wear as the load is picked up off the slips, these points being: •

At the top of the crown sheaves.

•

At the bottom of the travelling block sheaves.

It is necessary to develop a programme of slipping through drilling line to prevent the drilling line becoming worn or damaged to such an extent that there will be the chance of failure, injury to personnel and equipment damage.


Maintenance


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The objective of a programme is to obtain maximum rope service without jeopardising the safety of the rig operation. The programme will be based on the use of 'Ton-miles' to record the work done by the drilling line and these can be calculated using slide rules provided by wire rope manufacturers or computer programmes based on formulae or with a hand held calculator. 5.4.2

Slipping and Cutting Programme Ton Miles of service will vary with types of equipment used and therefore the cut-off programme should be tailored for the individual rig. Particular conditions to consider for their effect on the condition of the drilling line are :1.

Use of DDM/Top Drives (Ref. Drilling Tonmiles).

2.

Stuck in the hole jarring and pulling heavy loads.

3.

Damage due to line jumping sheaves, vibrating and striking derrick equipment.

4.

Use of block retraction equipment.

5.

Condition of Spooling Equipment

It is important that the drilling line is inspected on a daily basis and any remedial work carried out if required, regardless of any predetermined calculations. This is particularly important for cases 2, 3 and 4 above. Senior Toolpusher must be informed of any damaged wire immediately. 5.4.3

Procedures for Slipping and Cutting Ref. - Rig Specific Work Methods.

5.4.4

Procedures for Changing to New Wire Reel General These are the procedures to be used when a reel of drilling wire is used up and it becomes necessary to start on a new reel of wire. These procedures use the tail of the old wire to pull through the new wire, thereby reeving up the system with new wire. There are several factors to consider when approaching the final layer or last few wraps of drilling line on the reel. Rig operations will need to be monitored to select the best time for shutting down the operation to change out to the new drilling line. It is preferable to perform this task between wells if possible, but otherwise consideration should be given to :1.

Stability of any open hole sections (changing line not recommended in this vulnerable position).

2.

Consider changing out line immediately after casing is set and cemented.

3.

Amount of drilling line work required in next section - predicted number of trips required? e.g. Is there a long interval to be cored, necessitating frequent trips?


Maintenance 4.


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Is there a programmed shut down period for rig operations? It is recommended that a long splice method (splice length approximately 26ft) is used to connect the two drilling lines and procedures are written to reflect this method. Do not use a snake and swivel to connect the drilling lines.

5.5

Drill String Maintenance

5.5.1

Introduction Drill collars, subs, hevi-wate drill pipe and drill pipe are a large and costly portion of the rigs drilling equipment. It is vital to use correct handling procedures to care for tool joints. This is particularly important when 'breaking-in' new or re-cut tool joints.

5.5.2

Handling New Tubulars The break-in period of a tool joint's life is the most critical part. Newly machined surfaces are more likely to gall. After some service the surfaces undergo some changes which make them more resistant to galling. The first few times tool joints are used it is important to consider the following :•

Make sure that the DDM/Topdrive saver sub(s) are in good condition. These mate with the majority of the joints.

•

Use thread protectors when picking up tubulars.

•

Thoroughly clean all pin and box threads to remove all grease, dirt, rust, and protective coatings or other foreign material.

•

Inspect for burrs, dings and wickers on threads and for handling damage on threads and shoulders, such as scratches, gouges and flat spots.

•

Thoroughly coat the shoulder and threads on both box and pin using a recommended tool joint compound.

•

Spin in new joints "SLOWLY", preferably using chain tongs. High speed rotation may cause galling. Make up joint with recommended make-up torque.

•

Break out connection, clean and inspect for minor damage. Repair same if possible, remove wickers etc.

•

Redope and remake to correct torque.


Maintenance •

5.5.3


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Make sure surface handling equipment is in good condition. Check slips and master bushings to prevent damage, see the IADC Drilling Manual for procedures/measurements. Check that hydraulic roughneck/rig tong dies are in good condition.

General Guidelines These will increase tool joint and tubular life :•

Drill string components should be equipped with thread protectors when not in use and when being picked up or laid down.

•

Ensure tool joint threads are clean and dry before doping same.

•

Use tool joint dope specified - do not use tubing and casing lubricants as they are 'too slick and can result in stretched and cracked pins. After breakin it is satisfactory to thoroughly dope the box threads and shoulders only.

•

Lift sub pins should be cleaned, inspected and lubricated on each trip. If damage to these pins goes unnoticed, they will eventually damage all the drill collar boxes.

•

It is recommended practice to break a different joint on each trip, giving the crew an opportunity to look at each pin and box every third trip. This ensures that the connections are adequately doped at all times. Inspect the shoulders for signs of loose connections, galls and possible washouts.

•

Do not allow the pin end to be stabbed against the box shoulder. This can produce a low spot on the shoulder which will result in a washout. Use stabbing guide where available.

•

Do not stop downward movement of the drill string with the slips. This can cause crushing or necking down of the drill pipe tube. Allowing slips to ride the pipe on trips out of the hole can also damage the pipe.

•

Accidental catching of tool joints with slips will permanently damage the slips. This could lead to slips failing, or damaging the pipe. In the event of such an accident the slips should be inspected for deformations, breakages or cracks.

•

Make sure the setback areas are clean and the wood in good condition. Use only tools designed to move joints on the setback. Sharp-edged tools can cause shoulder damage which will lead to washouts.

•

Wash out drill string components when laying them out. protectors are installed.

•

Inspect drill string components at regular intervals e.g. at end of every well, six monthly intervals or as specified by Operator's Contract. Inspection as per API RP7G.


Ensure thread

Maintenance 5.6


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Drawworks Brakes and Emergency Systems It is vitally important to maintain Drawworks brakes in proper adjustment. This will ensure that full braking power is available when required. The Driller should check over the system at the start of his shift and items of particular importance are :-

5.6.1

•

Brake cooling water flow and pressure set at recommended settings.

•

Monitoring and battery back-up systems for auxiliary brake to be in operation.

Brake Adjustment Proper adjustment of brake linkage as per Manufacturer’s Manual. Adjust the brakes regularly with small adjustments rather than leaving them to go too far out of adjustment. Brake cooling water flow and pressure set at recommended settings. Monitoring and battery back-up systems for auxiliary brake to be in operation. When adjusting brakes consider :-

5.6.2

•

Brief the crew members properly before starting the operation. Ensure that they are sure of the direction to make the adjustments required.

•

Ensure that block speed is controlled at all times when brakes are disengaged for adjustment by either picking up slowly in the lowest gear OR lowering slowly with the auxiliary brake fully on.

•

Adjust the brakes by only a ‘Flat’ at a time and test the brake each time.

•

Check brake balance bar to ensure both brakes in proper adjustment.

Crown Saver System Crown saver systems to be in good working order and proper adjustment. These can take several forms :•

CROWN-O-MATIC: Toggle switch above Drawworks drum which detects excess wire and disengages air clutch and engages brakes. This is set to prevent the travelling block striking the crown. This must be tested at the start of each shift (as soon as possible) and logged on the IADC Report. This is carried out by picking up slowly whilst observing the block height until the wire activates the CROWN-O-MATIC. Adjust the position of the toggle switch as required.

•

CROWN SAVER: This system uses proximity switch(es) to alert the Driller when the block is close to the crown and then to disengage the clutch and engage the brakes before the block is too close to striking the crown.

•

This must be tested regularly. The ease of resetting these systems will determine when and how often to test them.


Maintenance •

6.0


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Pneumatic/Mechanical/Electrical condition monitoring must be carried out according to computerised planned maintenance system.

REFERENCES N/A.

7.0

ENCLOSURES Enclosure 1

Derrick Inspection Report (QA Documented Form 031)


Maintenance


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DERRICK INSPECTION REPORT

Enclosure 1


G:\Management Library\Forms\Offshore\QA Documented Forms\031 – Derrick Inspection Report – Rev 2.doc

Page 1 of 2


Maintenance

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DERRICK INSPECTION REPORT ITEMS TO BE CHECKED

PASS

Bolts : All bolts

FAIL

FREQUENCY

CORRECTIVE ACTION

CLOSE OUT DATE

1 Leg Per 3 Mths Visual Remainder After Jarring

Access Ladders : All ladders

Weekly

Lighting : All light fittings

Weekly

Safety Equipment : Inertia Reels Safety Belts Derrick Escape Line BA Escape Sets

Weekly Weekly Weekly Weekly

Crown Block : Sheave Condition Lubrication Debris In Area

Weekly Weekly Weekly

Air Hoists : Wireline Condition Sheaves Secured Wire Clear Of Beams

Weekly Weekly Weekly

Monkey Board : Windwall Condition Camera Condition Debris In Area Racking System Date: ........................................................

Weekly

Drill Crew: ................................................................................


Driller Signature: ...................................................................... Page 1 of 2


Maintenance

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DERRICK INSPECTION REPORT ITEMS TO BE CHECKED

PASS

FAIL

FREQUENCY

Stabbing Board

As Required

Dolly Rollers

As Ops. Permit

Hoses (General)

Weekly

Safety Slings

Weekly

Padeyes

Visual Weekly

CORRECTIVE ACTION

CLOSE OUT DATE

S.T.P. Comments on Inspection Report

S.T.P. Signature: ................................................... Date: ................................. ................................................................................. Close Out Action Completed

Senior Toolpusher Signature: ..................................................


Date: ................................. Page 2 of 2

Maintenance


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DOP 206 - Rev 4

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