Shale stabilizing drilling fluid

Details Shale stabilizing drilling fluid Shale stabilizing drilling fluid

1978-02-13

1979-03-06

Guynn, Herbert B.

Boring or penetrating the earth

Processes

Boring with specific fluid

252 85A, 252 85C, C09K 702

Patent

active

041425952

ABSTRACT:
A process and composition are described for use in drilling shale and especially in drilling the troublesome types of shale which heretofore have been impossible to drill effectively. The aqueous drilling fluid of this invention so effectively stabilizes the shale that additions to maintain the special drilling fluid can be discontinued or drastically reduced, once the shale formation has been penetrated and drilling below the shale could even be done with conventional drilling fluids.
The drilling fluid contains between about 0.2 to 1.5 pounds per barrel of flaxseed gum together with potassium and/or ammonium salts. The potassium and/or ammonium salts are used in quantities to provide a concentration of the cation of the salt of at least 10,000 ppm. As the drilling fluid is a non-clay type, a non-clay viscosifier is used. Preferably, the cation concentration is tailored to drilling fluid salinity such that the cation concentration in parts per million is approximately equal to at least 10,000.times.(1+0.025.times.the sodium chloride salinity in percent saturation).

REFERENCES:
patent: 1460788 (1923-07-01), Carmen
patent: 1807082 (1931-05-01), Boynton
patent: 2812161 (1957-11-01), Mayhew
patent: 3017351 (1962-01-01), Scott et al.
patent: 3360461 (1967-12-01), Anderson et al.
patent: 3723311 (1973-03-01), Lummus et al.
patent: 3852201 (1974-12-01), Jackson
patent: 3953336 (1976-04-01), Daigle

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