Method and apparatus for testing spotting fluids for releasing stuck drill pipe
An apparatus is described for determining the efficacy of a spotting fluid intended to release a drill pipe which has become stuck within a borehole, the apparatus comprising: (a) an open vessel containing a drilling mud filter cake, which cake has a top surface; (b) a cylinder having an outer surface with at least a portion of the outer surface adhering to the cake and the cylinder having the axis thereof oriented parallel to the surface of the cake; (c) a spotting fluid applied to the cake surrounding the cylinder; (d) a means for applying a force perpendicular to the axis of the cylinder to separate the cylinder from the cake; and (e) a means for concurrently measuring and recording the force required to separate the cylinder from the cake.
- Assignee:
- Standard Oil Production Co., Houston, TX
- Patent Number(s):
- US 4829816
- OSTI ID:
- 5749255
- Resource Relation:
- Patent File Date: Filed date 6 Nov 1987
- Country of Publication:
- United States
- Language:
- English
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