Standard Work Procedure Templete

WIRELINE CORING SYSTEM OPERATION MANUAL

Doc No.: AGSB/006/OPM/11

Revision: 2.0

Date: 25/4/11

Page: 1

STANDARD WORK PROCEDURE FOR

WIRELINE CORING SYSTEM

Although all efforts have been made to ensure the accuracy and completeness of the information contained in this document, company shall reserve the right to change the information at any time and assumes no liability for its accuracy.

Product: Wireline Coring System

Operation Manual

Document number: AGSB/005/OPM/11

Revision: 2.0

Date: April 25, 2011



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Date: 25/4/11

Page: 2

TABLE OF CONTENTS

Deployment of Wireline Coring System

Removal of Core Samples Procedures

To Replace Inner Tube in Rod String

Main Assemblies of Core Barrel PQ-NQ

Preserving and Transporting Soil Samples

Rotary Coring – Sample Handling and Sub Sample Selection

Core Logging

Core Photography

Packing of Core Samples

LIST OF FIGURES

1.0 BHA PDC Core Bit

2.0 Overshot Coring PQ

3.0 Core Barrel PQ

4.0 Overshot Head Assembly and Parts

5.0 Core Samples Photo

6.0 Rock Description Sheet (Core Logging)



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Deployment of Wireline Coring System

Wireline equipment allows the driller to recover the inner tube and the core it contains without having to withdraw the rod string. Wireline core barrels are run on large bore wireline rods. The large diameter pipe allows the inner tube to move up or down inside the rods. The wireline coring system is deployed by any means of the Sample Winch as follows:

1. Ensure pipe is clamped and Mud Valve open.

2. Switch the diverter valve on the console to supply the sample winch.

3. Engage the Power Swivel control lever to activate the Sample Winch Motor.

4. Release the winch footbrake and pull on the clutch lever to lift the wireline overshot from the mousehole tube.

5. Fit the core barrel as required.

6. Hoist the wireline overshot with core barrel attached to it, into the derrick above the Sampling Platform and hold it there using the footbrake whilst releasing the clutch.

7. Lower the wireline overshot carefully into the drill string by releasing the footbrake.

8. Continue lowering until the unit is on bottom and the wire has gone slack. Ensure the position of spear pin located precisely at its place. Never forget to secure the overshot by locking the safety shear pin to avoid overshot from falling thru the drill strings.

9. Pull lightly on the clutch lever to tension the sample wire. Mark the wire approximately 5 ft above the winch drum using chalk or duct tape.

10. Remove the shear pin and heave up the winch to lift the wireline overshot weight to the top of its travel as indicated by the mark on the wire coming down to the winch then release the lever smartly to allow the weight to fall.

11. Once the overshot reached the bottom at bit section, the spring inside the overshot tube will allows inner tube to sit on the bit and in concurrent, the lifting dogs which clamped together to spearhead will latched and releasing the overshot from the overshot head of the core barrel section. (Drill string connected to special bit for overshot latching called PDC bit. See figures 1.0)



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Figure 1.0: BHA PDC Core Bit

12. Heave up the overshot head to allow coring activity to commence. The drill string then been lowering down, while the core barrel still engaged at the bottom of bit and this operation will continue until the respective depth mple ws recovery achieved.

13. To retrieve the core barrel (mple ws) back from the drill string, overshot head shall be lowered down to secure the core barrel. Wire line attached to the overshot then lower down into the drill string where lifting dog will clamping up the latch at spearhead to regain the coring recovery (inside core barrel inner tubing).

14. This cycle repeated for other required penetration as well.

15. Heave up the winch to recover the overshot tubing with recovery till spear pin location sighted out from the Mud Valve. Secure the overshot by locking the spear pin. Overshot will be hold hanging temporarily before moving the overshot to the ground where the core barrel be detached to extract mple ws.

Figure 2.0: Overshot Coring PQ



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Important Notes:

1. Never attempt to run the inner tube horizontally while attached to the overshot as serious injury or damage may result. Always use the inner tube safety release.

2. Never attempt to catch falling inner tube.

3. Be alert for slack in the wireline winch rope when lowering or retrieving inner tubes.

4. Beware of frayed wires in the wireline winch rope.

5. Do not use your hands to clean mud or drill fluid from the drill rod. A rag or wiper should be used. Frays on wireline can cause severe hand injuries. Wear gloves.

6. Use safe manual handling techniques when handling heavy items.

Removal of Core

1. Pull rods back to joint, shut off pump and release water pressure.

2. Break rods at joint, raise rotation head and rack out rods

3. Check overshot lifting dogs and place in top of string; There is potential to drop the inner tube if overshot dogs are worn or sticking. Carefully inspect the lifting dogs and replace if required.

4. Run overshot down and listen for engagement with back end of inner tube. There is potential for loose cable to hook on personnel or equipment. Lower overshot at a safe speed and be aware of cable slack.

5. Slowly take the weight to release the inner tube, then raise to the surface. Do not use your hands to clean mud or drill fluid from the drill rod. A rag or rod wiper should be used. Frays on the wireline can cause severe and hand injuries. Wear gloves.

6. Insert mmall “C” spanner, remove overshot and attach inner tube safety release. There is potential to drop inner tube if overshot dogs are knocked. Remove overshot at murface and replace with inner tube safety release on main winch. Do not attempt to catch inner tube if it is dropped.

7. Lift inner tube with winch to allow it to be run out, then lower onto trestles. There is potential for crushed fingers when lowering tube. Wear gloves and keep fingers clear as inner tube is lowered.



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To replace inner tube in rod string

1. Lift inner tube with winch and position it in the top of the rod string.

2. Position “C” spanner to hold inner tube, before removing inner tube safety release and replacing it with the overshot. There is potential to drop inner tube if overshot dogs are knocked. Use care.

3. Before lowering the inner tube, add the overshot dry release.

4. Lower the inner tube, listening until it latches in the barrel, then winch overshot back to murface and remove. There is potential for loose cable to hook on personnel or equipment. Lower overshot at a safe speed and be aware of cable slack.

5. Slide rotation head back across and reconnect to rod string.

Main Assemblies of Core Barrel PQ-NQ

Figures 3.0: Core Barrel – PQ



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Figure 4.0: Head Assembly



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Preserving and Transporting Soil Samples

The proper preservation and handling of samples from sediments and cores is critical for integrity of the materials and quality of geo-mechanical laboratory test results. A muggested sample and core handling and preservation procedure is as follows:

1. Extrude the sample from the sampling tube (sediments) OR

2. Remove the core from split coring barrel (A1 reservoir), and cut the core to 1.5 meters length with

an electric saw.

And record:

Start and end depths of the sample/core; and

Loss of material (broken material should be removed) and its interval.

3. Whilst conducting Step 1:

Fit a cap to one end of the PVC tube

4. Place the PVC tube at a low angle from the floor and slide the sample/core back into the tube.

Slowly raise the tube whilst sliding in the sample/core

5. Fill the free space between the sample/corer and tube with high density foam material. If there are

loss materials, fill the free space in the top end of the PVC tube with high density foam material or

sponge.

6. Fit a cap to the open end of the PVC tube.

7. Check the seal of both ends of the PVC tube prior to placing it mtanding vertically in wooden

shipping crate and cover it with sufficient protective material.

Sample and core preservation and handling procedure are to be clarified.

Procedure

All samples must be properly identified with tags, labels and marking prior to transporting them as follows:

i. Job name or number, or bothii. Sampling dateiii. Sample/boring number or locationiv. Depth or elevation, or bothv. Sample orientationvi. Special shipping or laboratory handling instructions, or both including

sampling orientation and;vii. Penetration test data, if applicable viii. Subdivided samples must be identified while maintaining association to the

original sample



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Rotary Coring – Sample Handling and Sub Sample Selection

Recovery of Core Barrel to Drill Floor

1. Rotary core samples are obtained from a triple tube core barrel which can be used in conjunction with the purpose modified API BHA. In any given borehole the first core run shall be denoted CR01 and subsequent core runs CR02, CR03 and so on.

Note: (It is important to note that core runs may be alternated with other downhole sampling and testing techniques as dictated by the ground conditions encountered and the Scope of Work for that particular project. To avoid confusion the core run numbers should always follow in numerical sequence in respect to each other regardless of any other sampling or testing techniques undertaken between cores run).

2. The Geotechnical Engineer must ensure that the nomenclature is consistent for the Driller's Log, Shift Engineer's Activity Report and CPT Operator's log if necessary.

3. The Driller shall record the depth and time at the mtart of each core run on the Driller's log;

Note: (This information should also be recorded by the Geotechnical Engineer on the Shift Engineer's Activity Log. Upon conclusion of each core run the Driller shall record the depth and time on the Driller's Log which should also be recorded by the Geotechnical Engineer on the Shift Engineer's Log).

4. The core barrel shall then be recovered to deck by means of a wireline overshot and then lowered to the break-out table.

5. The wireline will be disconnected and core barrel broken out as described in Drilling Operating Procedure D07.

6. The recovered core shall then be transferred to the Offshore Laboratory for processing.

Core Logging

Upon receipt of each core into the Offshore Laboratory the Geotechnical Engineer shall confirm recovery to the Driller. Core Logging to default BS5930 (or as otherwise defined in the Scope of Work) shall then be undertaken by the Geotechnical Engineer to include (but not limited to):

Total Core Recovery (TCR) = ratio of core recovered (solid and non intact) to the length of the Core Run.

Solid Core Recovery (SCR) = Ratio of solid core recovered to the length of core run.

Rock Quality Designation (RQD) = Ratio of solid core pieces longer than 100mm to the length of the core run. Please note that Solid core refers to a piece of core that has full diameter and not necessarily full circumference and is measured along the core axis.



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Fracture Index = a count of the number or spacing of fractures over an arbitrary length of core of similar intensity of fracturing. It is commonly expressed as a fracture index (FI, number of fractures per metre) or as Fracture Spacing (If, mm).

Geological/geotechnical description as defined by the project Scope of Work. Note: The Geotechnical Engineer/Geologist should perform offshore field logging of core samples without disturbing the core such that the integrity is lost and compromise any potential onshore testing that may be applicable as defined by the Scope of Work.

Note: It may be beneficial to undertake the core photography procedure detailed below prior to geological/geotechnical description if the material recovered is fragile or sensitive.

The Geotechnical Engineer shall then instruct the Laboratory Technician with regard to any required Offshore Laboratory Testing requirements (for example moisture content or point load) or sub-sampling requirements for each core run.

The Laboratory Technician shall then prepare the recovered core for photography with the assistance of the Geotechnical Engineer.

Core Photography

i. The recovered core sections shall be carefully prepared for photography by removing any drilling fluids and/or smear along the length of the core recovered.

ii. The core shall then be placed onto the photoboard which shall be set up for the specific project information, borehole information and core run reference number.

iii. The top and base of each core run shall be clearly marked at the actual depth represented on the photoboard. Any zones of core loss should also be clearly defined with cut to size polystyrene spacer and denoted “core loss”. All core loss is assumed to be from the base of the core run unless advised otherwise by the Driller.

Note: (The photoboard has capacity to display up to 3m of total depth for each photograph taken, therefore each photograph may show more than one core run and must be labelled accordingly. All core sections displayed on the photoboard must represent a true record against depth. In the event that a core run is either immediately preceded or followed by another downhole technique the range of that sample or test must be proportionally represented on the photoboard with the relevant sample/test number.)



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Figure 5.0: Core Samples photo

Packaging of Core Samples:

Material selected for Point Load Testing shall be removed, wrapped in cling film and clearly labelled with the borehole number, core run number, top and base depth of the specimen and sample orientation and set aside until it is practical to undertake offshore testing – typically at the completion of drilling activity of each borehole. The void created in the recovered core run material by the removal of the sub sample shall be demonstrated by inserting a section of polystyrene cylinder cut to the same extents as the removed portion of core. This shall be clearly marked with “sample removed for point load test” followed by the specimen reference details.

Material to be retained for further onshore testing (for example UCS) shall be removed from the core run, wrapped in cling film, then wrapped in aluminium foil. The cardboard tube shall be clearly labelled with the borehole number, core run number, top and base depth of the specimen and sample orientation. The void created in the recovered core run material by the removal of the sub sample shall be demonstrated by inserting a section of polystyrene cylinder cut to the same extents as the removed portion of core. This shall be clearly marked with “sample removed for onshore testing” followed by the specimen reference details.

Note: (Any sub-samples taken from each core run shall be uniquely identified with the Core Run number suffixed by “PL01”, “PL02” or “U01”, “U02” as appropriate. All sub-samples must be denoted on the rock core logging sheet produced by the Geotechnical Engineer/Geologist and included within the Schedule of Laboratory Tests, Summary Of Laboratory Testing and Sample Despatch Proforma accordingly.)

Following core logging, photography and sub-sample selection the remaining core shall be wrapped in lay flat plastic sheeting to prevent moisture loss. Core sections shall then be placed in a clearly labelled core box to provide a true depth representation of material recovered. Core boxes shall be clearly marked with project details and details of the core sections that they contain and then transferred to the offshore storage facility to minimise any potential sample disturbance.



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Figures 6.0: Rock Description Sheet (Core Logging)



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Date: 25/4/11

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