7” Liner - Cementing Preparation and Procedure Checklist
Hold pre-job planning meeting. All equipment to be checked and personnel familiar with the plan.
The final cement programme to be issued to the rig and approved by the Drilling Superintendent.
Ensure that BJ needs to blow out water from the lines after performing pressure test to avoid frozen the lines if job is carried out in cold weather.
Before cement job begins, ensure that the cement is fluffed and transferred from one tank to another tank to make sure it would transfer in the cold weather.
Carry out pressure testing of cement line while mixing cement.
Prior to start cementing, ensure to perform the following:
Total required volume of technical water to be stored on the rig site some days in advance of the job.
Pre-job analysis of technical water, slurry and spacers. Perform tests for possible fluid contamination and include in the program.
Be sure the slurry formula is fit to avoid flash setting due to possible slurry dehydration while passing through TOL.
Prepare cement mix water in the batch mixers and store in the KPO tanks, prepare spacers in the batch mixer and store in same.
Confirm that the Technical water is being supplied directly from the LMP. Do not use water from any other source. BJ supervisor to check the water.
Avoid using NaCL Brine to perform BJ lines test until a contamination test has been performed.
Ensure correct tanks and drill water are delivered at least 24 hours in advance of the cementing job.
Check that cement chemicals have been added to the mix water in the correct order (e.g.: FP-21L, A-9, EC-1, R-3, CD-32 & FL-25)
Thoroughly mix each chemical after adding them to the mix water. Take samples of final mix fluids, label and retain for lab verification tests.
Ensure all BJ washer and spacers should be prepared in the batch mixer and pumped by the BJ unit. For improved job control avoid preparing washer and spacer in rig pits and avoid using rig pumps.
Take 5 gallons dry cement sample in advance of the cement job so that pilot testing at cementing lab using rig samples can be carried out.
Take 1 gallon mix water sample during the cement job.
Check that the following equipment is available at the rig site: Weatherford circulating tool; Long elevator bails (Parker Supplied).
Mud Logger to ensure stroke counters set to zero before pumping spacer and displacement.
If losses encountered during drilling 8 ½” hole section, attempt to cure losses before mixing and pumping cement slurry. Note: if no losses encountered mixing of slurry could commence during liner running so as to be ready once circulation of liner contents complete.
While preparing the slurry, continue to circulate and check the following:
Cement head bearing is secured to the derrick prior to rotating the liner
The tugger must be manned at all times during rotation.
There is a minimum of 20 Klbs (10 tonne) of drillpipe weight onto the liner prior to rotation and re-engage torque fingers of ‘HRD’ tool in ‘HRD’ profile of ‘ZXP’ packer to allow rotation of liner.
Establish circulation and rotation (generally ensure continued circulation during all rotation) prior to cement job and monitor rates and pressures.
Note torque readings at 20 and 30 RPM with a minimum weight of 20 Klbs (10 Tonne) of drill pipe weight on liner.
Check that the top drive is set properly in order not to limit the torque below programmed for rotating the liner during the cementing job.
Make sure there is good communication possible between the rig-floor and the cement unit. Have spare cement unit on location.
Ensure that TDS IBOP is closed before hooking up the cement lines. Open the low torque valve.
If possible use the caliper log to calculate the slurry volume required.
The Liner should be set 100m inside the 9 7/8" casing. Reduce the slurry top to 50 - 100m above TOL. Hole volume % excess and TOC should be agreed & communicated to the team once the logs are run.
Before the job check & calibrate all Saipar and WFD-Datalog sensors and stroke counters.
Pump the required amount of cement as per cementing programme, allowing for volume of approximately 100m above the Liner Top (with the DP connected to the hanger). Observe and note the torque required to rotate the Liner.
Stop rotation to allow safe release of the Drill Pipe Pump Down Plug as follows (it is not allowed to have man in riding belt whilst rotating).
When cementing the 7'' liner after bumping the plug pressure up to 1000psi over final displacement pressure and hold for 5 mins.