Method and composition for reducing torque in downhole drilling
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United States of America Patent
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Feb 10, 1998
Grant Date -
N/A
app pub date -
Jul 10, 1996
filing date -
Sep 2, 1994
priority date (Note) -
Expired
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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.
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