Method and apparatus for testing spotting fluids for releasing s

Details Method and apparatus for testing spotting fluids for releasing s Method and apparatus for testing spotting fluids for releasing s

1987-11-06

1989-05-16

LaRoche, Eugene R.

Measuring and testing

Borehole or drilling

Downhole test

73 614, 166301, E21B 4700

Patent

active

048298166

ABSTRACT:
An apparatus and method for testing the performance of spotting fluids used for freeing drill pipe stuck to drilling mud filter cake in a borehole. A small cylinder simulating the drill pipe is pressed against a filter cake in a vessel. Spotting fluid is applied and the cylinder and cake are pulled apart. The maximum force required to free the cylinder is recorded.

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Bond et al., "An Improved App. for Interfacial Tension Meas. by the Ring Method", Rev. Sci. Instrum., vol. 44, No. 6, Jun. 1973, p. 779.

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