Casing and tubing selection are one of the critical tasks for constructing each wellbore to meet the wellbore objective. There are several selection criteria for casing/tubing string design.
The factors must be contemplated when designing a casing and/or tubing string as listed below;
Added by Rachain Jetjongjit on February 22, 2010 at 2:30pm —
Slug Mud: It is heavy mud which is used to push lighter mud weight down before pulling drill pipe out of hole. Slug is used when pipe became wet while pulling out of hole.
Normally, 1.5 to 2 PPG over current mud weight is a rule of thumb to decide how much weight of slug should be. For example, current mud weight is 10 PPG. Slug weight should be about 11.5 to 12 PPG.…
Added by Rachain Jetjongjit on February 19, 2010 at 6:30am —
You may not know that drilling fluid or mud has several important functions helping us achieve goal to drill well. I would like to share about the functions of drilling fluid as follows;
1. Transport cutting and dispose to surface - The drilling fluid brings the drilled material to the ground surface either by mud rheology and… Continue
Added by Rachain Jetjongjit on February 16, 2010 at 11:00am —
Steering (orienting or sliding) is drilling with mud downhole steerable mud motor. Drilling with the steerable motor does not rotate drill pipe because it uses hydraulic power to drive down hole motor and bit. Steering is used in order to control well direction.
Rotating is drilling with Topdrive or rotary table and… Continue
Added by Rachain Jetjongjit on February 13, 2010 at 11:00am —