High temperature drilling mud composition

Details High temperature drilling mud composition High temperature drilling mud composition

1986-09-11

1988-10-18

Guynn, Herbert B.

Compositions

Leather or fur treating

252 851, 252 8511, C09K 702

Patent

active

047786086

ABSTRACT:
A composition, including a mixture of high-yield bentonite and low-yield bentonite, in a ratio of high-yield bentonite to low-yield bentonite in the range of about 10:1 to about 1:1, and preferably in the range of 5:1 to 3:1, together with a water-in-soluble form of leonardite, that is particularly useful in a water-based drilling mud and exhibits unexpected stability and rheological functionality at the high temperatures and high pressures encountered in deep wells.

REFERENCES:
patent: 2826548 (1958-03-01), Busch
patent: 3079334 (1963-02-01), Clem
patent: 4235727 (1980-11-01), Firth
Rogers, Composition and Properties of Oilwell Drilling Fluids, Third Ed., Pub. 1963, pp. 261, 262, 380 and 381.
Gray et al, Composition and Properties of Oil Well Drilling Fluids, Fourth Ed., Pub. 1980, pp. 568 and 569.

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