الرحيم الرحمن الله بسم

Drilling out Cement Operation comes after Squeezing Cement Operation Job:

Preparation :1. Pack off.2. Pack off Rubber.3. Slips. 4. Power swivel.5. Casing gauge. 6. Weight indicator.

Pack off Rubber:To prevent the water comes out of BOP through DP (2 7/8”) meanwhile circulation

because BOP pipe Ram has been already closed, this Rubber hold pressure until 700-800 psi, if the pressure of pump more than 1000 psi, the assistant driller in pump should decrease the Rate of pump & closed the pump and must tell the Rig Engineer.

R/U the Rig Floor. N/U BOP & Tubing head (Spool) for Gas Well ( hold pressure until 3000 psi):

Tubing head (Spool), 3000 psi for Gas well

N/D & M/U Tubing head (spool) hold pressure until 3000 psi & ESP Spool for Oil Well hold pressure until 5000 psi, R/D the Rig Floor.

ESP Spool for Oil Well 3000 psi

Tubing head (spool) 5000 psi oil well with double stud

BOP, 5000 psi

X-over, adapter or flange

Casing head

Rig Engineer should Prepare Drilling String Design (BHA Design)& he must Measure drill-pipe (tally) and check thread, greased & must be clean, by using drift with crew:

Bottom Hole Assembly (BHA) Design:

Consist of:

1. Bit (6” 3 1/2" Reg Pin).2. Bit sub (3 ½” IF Box* 3 ½” Reg Box).3. Drill collar (4 ¾”, 3 ½” IF Box).4. Drilling Jar (4 ¾”, 3 ½” IF Box).5. X-over (2 7/8” IF Box * 3 ½” IF Pin)6. Drill pipe (2 7/8”).

The crew must RIH w/ Drill string to Total Depth (tagged TOC), Driller must go up 5m above TOC and the crew should circulate the well(down casing ,up tubing) to check the cement is wet or dry, if cement is wet & observed in settling tank (shaker), the crew should circulate until the water comes clean in shaker.

R/U & N/D Pack off w/ BOP (by 4 pail) & R/U power swivel with special elevator (4 ½”) & connect power swivel w/ x-over in bob joint & enter pack off Rubber in bob joint and go down by Rubber to Pack off until enter in Pack off successfully.

slips

Pack off

Pack off Rubber

The Rig Engineer should ask the crew to make Pressure test after M/U back off rubber (500-750 psi), meanwhile circulation.

The driller & floor-men connect power swivel with first joint of drill-pipe, then Start drilling after the mention from derrick-man in shaker that return is observed, and the pressure is below 500 psi in casing pressure gauge &weight indicator (WOB 1-2 ton).

meanwhile drilling if the assistant driller noticed increase in pressure the driller must stop drilling (this means bit plugged) and go up w/ drilling string, then circulate down casing (never reverse the circulation) until pressure drop to normal (bit nozzle opened), then continue drilling.

When the joint has been drilled ,the driller go and closed the pipe Ram & he will mention to assistant driller that to start circulation meanwhile the shaker-man observed return in shaker, if the cutting is fine or big size.

Meanwhile the assistant driller circulate the well (down casing, up tubing) ,he should observed that the pressure in the pump (700-800) psi, if the pressure increase more than 1000 psi ,he must decrease the speed Rate in the pump and closed the pump until pressure decrease.

Continue drilling to TD, the speed of drilling depend on type of cement dry or wet, if the cement dry (one joint take 2 hrs enough with circulation), the cement wet (one joint take 3 hrs enough with circulation).

POOH W/ BHA assembly after R/D power swivel & Rig Engineer should ask the crew to RIH W/scraper 7”csg to design depth to clean the well-bore from the cutting when the driller arrived to TD (tagged), go up 1 joint to Ream & Wash the well-bore.

Rig Engineer must check bit condition form and storage it for next job according to dull grading, also check power swivel.

Then TCP job is taken place.

Power swivel Engine:

Consist of:

1. Sensor for oil hydraulic line.

2. Tanks for oil (diesel).

3. Pump.

Prepared by:

Ala-eldin Saad Awadallah. Trainee Engineer.

Supervised by:

Eng. Ahmed Adil.