Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Patent
1997-06-03
1999-08-31
Kelly, C. H.
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
507135, 507138, 507136, 507139, 252 1, C09K 700, C09K 300, E21B 2100
Patent
active
059453850
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: 4230586 (1980-10-01), Bretz et al.
patent: 4356096 (1982-10-01), Cowan et al.
patent: 4382002 (1983-05-01), Walker et al.
patent: 4409108 (1983-10-01), Carney et al.
patent: 4941983 (1990-07-01), Coates et al.
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