Method and composition for reducing torque in downhole drilling

Details Method and composition for reducing torque in downhole drilling Method and composition for reducing torque in downhole drilling

1996-07-10

1998-02-10

Suchfield, George A.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

175 61, 175 62, 175 65, 175 66, 507135, 507136, 507128, 507940, E21B 2100, E21B 4700, C09K 702

Patent

active

057158967

ABSTRACT:
The present invention relates to a method and a solution for use in downhole drilling to reduce the torque necessary to rotate the drill string. The solution comprises a phosphate and a sulfonate according to the formula (RSO.sub.3).sub.x Me.sup.x, where R is selected from the group consisting of an alkyl group, an aryl group, an alkylaryl group, and mixtures thereof having a molecular weight between about 280 and about 650, x is the number of (RSO.sub.3) groups, and Me.sup.x is a metal ion having a valence x. The phosphate is preferably a phosphate ester, ether phosphate, or soluble phosphate having a molecular weight in the range of about 300 to bout 900. The phosphate is able to operate at temperatures prevailing in drilling mud systems. The solution is pumped down a drill string as a slug in order to coat solids which accumulate in the well and allow them to be removed along with the drilling fluid.

REFERENCES:
patent: 3642623 (1972-02-01), Bennett et al.
patent: 3712393 (1973-01-01), Sheldahl et al.
patent: 3840460 (1974-10-01), Sheldahl et al.
patent: 4064056 (1977-12-01), Walker et al.
patent: 4496012 (1985-01-01), Savins
patent: 4821563 (1989-04-01), Maron
patent: 5099930 (1992-03-01), Enright et al.

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