Bottom hole temperature from logs consistent with norm and relayed to cementing Company
Caliper run. Is hole under/in/overgauge
Casing drifted, threads clean, consumables in place as per program
Strokes to bump
Plan to monitor returns/ losses
Contingency for losses - minimum turbulent flow, maximum laminar flow
Open-hole excess volume determined
Cement and additive stocks sufficient
Chemical inventory before slurry and spacer preparation.
Has the Cementer been told how much excess mixfluid should be available? i.e. calculated volume + tank dead volume + contingency
Cement truck checked out and run recently
Cement calculations done by at least 2 people and cross checked
Spare chicksans available on floor or catwalk
Plug dropping head and plugs inspected. Operation of tattle-tail last time, serviced, working
Loading of PDH witnessed by Drilling Supervisor. Valves secured
Strokes to bump plug and strokes to fill pipe calculated
What is the plan for handling fluids at surface. Can pits be isolated – suction & return. Mud Engineer and Mud Loggers clearly briefed
Radios checked
Stroke counter functioning OK
If displacing with rig pump, use one pump only.
Double the chemical requirements calculated available.
Check water to be used (salt content is too high/ Mg level to avoid 'flash setting').
Set the oven to the test temp. before the job starts.
Discuss the complete job when contractor arrives on site.
Be present when the cement chemicals are being added to the water. Take two samples of the mixwater (usefull if a problem occurs).
Calculate:
1. the volume and strokes to cement equalised and bump.
2. the expected differential pressure at bump.
3. based on the planned height of cement in the annulus estimate the pressure just before bump.
Litecrete: re-blend and test the dry blend cement at the rig.
Litecrete: “more” mix water must be prepared.
Preprare several copies of the cement program Make a list of people who should have one.
Cement samples sent to town
Have cementers check stock for next casing job
JOB PLANNING Checklist
BHST and BHCT consistent with recipe
Spacer’s compatibility been checked
Is fluid loss additive required? It is cheaper to use standard LCM in the spacers rather than in the slurry.
If a new system is introduced, has a sensitivity test been done?
Are the spacers recommended cost effective
Is free water acceptable (high angle cementation only)
DURING JOB Checklist
Note times of arrival of contractor and other significant times during the job (floor handed over to contractors, pressure testing of lines, plug dropped, bumped etc.).
Have with you the program and the pre-calculation, a calculator is also advised.
Set up non-oral method of to advise cementer of slurry densities whilst mixing
Use rig personnel to assist with monitoring job
Sampling: - take two samples of final slurry, one to be placed in the oven and one outside. For 'on the fly' take four samples, two in and two out of the oven.
If a tail slurry is planned take 2 samples also.
AFTER JOB Checklist
Prepare a cement job report and send to Drilling Superintendent
Have cementers rig down equipment as soon as possible
Insure that personnel do not remain on the wellsite if not required.