Differential Sticking Test Part No. 21150
Most incidents of stuck pipe are caused by differential-pressure effects. Excessive differential pressures across lower-pressure permeable zones can cause the drillstring to push into the well-bore wall where it becomes stuck. When differential sticking occurs, spotting fluid can sometimes free the drillpipe.
Differential sticking may be identified by the following characteristics:
Pipe sticks after remaining motionless for a period of time
Pipe cannot be rotated or moved when circulation is remained.
The Fann Differential Sticking Tester Apparatus was designed to determine "stuck pipe tendency" and the effectiveness of spotting fluids in any given drilling fluid. The stuck pipe tendency coefficient is read directly data at the conclusion of the test.
By measuring the area of caking during a test, a bulk sticking coefficient is obtained; and by using a yoke accessory, the sticking coefficient of a controlled cake thickness can be measured. The question of how likely a given fluid will produce a "stuck" situation and the effectiveness of a given treatment can be investigated onsite.
The unit is pressurized by CO2 assembly or any nitrogen source. The standard test uses 477 psi differential pressure applied to a stainless steel vessel of approximately 140ml capacity. Measurement can be made on either a flat-faced torque plate or a plate of 12-1/2" radius (both are provided). In the event of a "sticky" sample the tends to adhere more to the plate than to the filter paper, stainless steel micro-corrugation disks are provided.
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