Ethers
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
Apr 13, 1998
filing date -
Apr 14, 1997
priority date (Note) -
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Abstract
A glycol ether block copolymer for use in low potassium content aqueous drilling fluids of the formula I R--O--[[--R.sup.1 O].sub.m [--R.sup.11 O].sub.n [--R.sup.111 --O].sub.p ]H I wherein the --R.sup.1 O and --R.sup.11 O groups may be in either order attached to the R--O group, and the R.sup.111 O group, if any is spaced from the RO group by the R.sup.11 O group and R.sup.1 O group, and is different from the group R.sup.11 or R.sup.1 O to which it is bonded directly. R is an organic group e.g. a hydrocarbyl group, R.sup.1 is an ethylene group, each of R.sup.11 and R.sup.111, which are the same or different is a propylene, butylene ethylene group, m is 1-10 or an average of 1.0-10, while n is 1-10 or an average of 1.0-10, p is O or an average of 0.5-5 and the sum of m and n is at least 3.0.
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