Divalent cation-containing well drilling and service fluid
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United States of America Patent
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Oct 9, 2001
Grant Date -
N/A
app pub date -
Aug 5, 1999
filing date -
Aug 5, 1999
priority date (Note) -
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Abstract
The invention provides clay-free, preferably biopolymer free, well drilling and servicing fluids comprising an aqueous divalent cation-containing water soluble salt, a bridging agent, and a pre-gelatinized crosslinked amylopectin starch suspending agent and fluid loss control additive. The concentration of the starch derivative is sufficient to provide the fluid with the following charactersitics: (a) a low shear rate viscosity less than about 10,000 centipoise; (b) a high shear rate viscosity at 511 sec.sup.-1 in the range from about 15 to about 70 centipoise measured at 120.degree. F.; (c) a fluid loss less than about 10 milliliters as measured at 185.degree. F. and 250 psi differential pressure across a 5 micron disk for 30 minutes; and (d) anti-settling characteristics as exhibited upon static aging the fluid for 16 hours at 185.degree. F.
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