7/28/2019 CS01 Running Conductor Casing

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IPM

Best Practices Manual

Running Conductor Casing Practices Nr: CS01 Page: 1 of 2

Date: 22 Jun 13 rev. 1

Criteria for running Conductor CasingThe following criteria apply to the running of the Conductor Casing:1. When the casing string is programmed. Setting depth will be specified in the Well Program.2. When losses or total losses occur when drilling for the surface casing and significant sand bodies are

encountered above the loss zone within the first 200 - 250 m. Attempting to drill ahead with water willdestabilise the sand bodies due to loss of filter cake and the reduction in hydrostatic head. The hole should

be opened using mud as a drilling fluid and the Conductor string should be run.3. If losses are manageble but the hole shows sloughing below 200 - 250 m, the hole should be opened and the

Conductor string should be set.4. If communication is observed from the outside of the stove pipe in the cellar, to the surrounding surface or

to nearby cellars, or if cracks are observed around the sub base / trailer and cellar area, the hole should beopened and the Conductor string should be set immediately.

Preparation (see BP CA01 and CA02)

Ensure section TD is the casing string length plus a 3 meter pocket.

Count and measure all joints of casing at the location and on the racks.

Ensure cellar pump is operational and clear the cellar of all debris and fluids.

Remove flowriser and cut the stove pipe to the required height to accommodate the wellhead.

Check the stab in stinger, stab in shoe and float valve for any damage. Check the stab-in tool for the right

size.

On the pipe racks, Baker lock the stab-in float shoe to the first joint.

Prepare shoe track and centralisers as per DCOM Bulletin # 2600.

Ensure casing circulating and fill-up device (e.g. LaFleur, Nubbin) is available on the rig floor.

Make up stab-in tool and rack back in mast.

Running Conductor Casing (see BP CA03)

Baker lock shoe joint to the next joint (#2).

Run the shoe joint into the well and as the shoe track descends into the mud confirm that the float is holding.

Run in 2 joints.

P/U stab-in tool, stab in and confirm circulation.

Run casing to planned shoe depth. Ensure proper make up torque (18 5/8: 1500 - 2000 daN.m, 13 3/8:

1200 - 1600 daN.m, see DCOM 2600).

Fill up every joint and constantly monitor the hole for losses using the trip tank.

Wash down the landing joint and at any point where resistance is observed. Report points of resistance.

If any joints are rejected a minimum pocket of 1 m should be maintained when selecting replacement joints.

On Reaching Planned Setting Depth

Count and confirm the number of remaining joints on the racks.

7/28/2019 CS01 Running Conductor Casing

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IPM

Best Practices Manual

Running Conductor Casing Practices Nr: CS01 Page: 2 of 2

Date: 22 Jun 13 rev. 1

Land Conductor Casing on the stove pipe.

Mark the stove-pipe at ground level so that any downward movement may be detected. Slack off the conductor casing in 5 tonne increments ensuring that there is no movement of the stove pipe.

Run stab-in cement tool and stab in.

Stab in and circulate 120% DP capacity, confirm the seal of stab-in tool.

Continue to circulate until mud has been conditioned to the requirements (see BP CS02).

Notes on landing off Conductor Casings

Hanging off 18.5/8" casing on 30" stove pipe is best performed using a c-clamp from WASCO which fits

below a casing collar. This item is manufactured on request. Alternatively, the casing may be landed andcentralised by welding the casing to the stove pipe with a minimum of six triangular welded lugs.

Hanging off 13.3/8" casing on 20" stove pipe is performed using a Cameron supplied casing hanger (itemB03 on Cameron wellhead diagram) which is held as a Shell stock item.

ReferenceFormer DCOM section 2222DCOM sections 2125, 2600 and 2800BP manual CS02, CA01, Ca02 and CA03