Method for removing alkaline sulfate scale in downhole tubulars

Details Method for removing alkaline sulfate scale in downhole tubulars Method for removing alkaline sulfate scale in downhole tubulars

1994-06-06

1995-05-16

Wyszomierski, George

Cleaning and liquid contact with solids

Processes

Using solid work treating agents

134 10, 134 221, 134 2211, 134 2213, 134 2214, 134 2216, 134 2217, 134 2219, 134 23, 134 32, 134 34, B08B 104, B08B 308, B08B 900

Patent

active

054156963

ABSTRACT:
The present invention relates to a method of removing alkaline earth sulfate scale from the interior surface of downhole production tubing comprising contacting the scale with a solvent having a specific gravity of at least 1.2 while simultaneously milling the scale with a rotating mill head connected to a downhole motor.

REFERENCES:
patent: 4980077 (1990-12-01), Morris et al.
patent: 5049297 (1991-09-01), Morris et al.
patent: 5084105 (1992-01-01), Morris et al.
A. D. F. Brown, S. J. Merrett, and J. S. Putman (Brown et al.), "Coil-Tubing Milling/Underreaming of Barium Sulfate Scale and Scale Control in the Forties Field", Society of Petroleum Engineers, 1991.

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