Laboratory Evaluation of Mud Differential Sticking Tendency and Spotting Fluid Effectiveness (CROSBI ID 196464)
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Gaurina-Međimurec, Nediljka ; Pašić, Borivoje ; Matanović, Davorin
engleski
Laboratory Evaluation of Mud Differential Sticking Tendency and Spotting Fluid Effectiveness
Differential-pressure pipe sticking occurs when a portion of the drill string becomes embedded in a filter cake that forms on the wall of a permeable formation during drilling. The dominant force is usually associated with a difference in pressures between the hydrostatic pressure of the mud and the pore pressure in the contact area, though adhesion and cohesion may also contribute some resistance to pipe movement. Some level of sticking occurs routinely in drilling operations and differential-pressure-pipe-sticking problems may not be totally prevented. These events only became problematic if the force required to pull the pipe free exceeds the pipe strength. If sticking does occur, several methods can be used for freeing the stuck pipe but the most common approach is to place a small volume of oil, or special spotting fluid in a wellbore annulus to free differentially stuck pipe. Spotting fluid reduces the stuck area and the forces of cohesion between the pipe and cake, and allowing pipe to be pulled free. Differential sticking tendency of different drilling fluids were determined in laboratory using sticking tester as well as influence of spotting fluids on freeing differentially stuck pipe. Results of the testing are presented in the paper.
differential sticking; stuck pipe; spotting fluid; filter cake; drilling
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