Method of increasing the low shear rate viscosity of well...

Details Method of increasing the low shear rate viscosity of well... Method of increasing the low shear rate viscosity of well...

2007-05-08

2007-05-08

Tucker, Philip C. (Department: 1712)

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

C507S111000, C507S112000, C507S140000, C507S211000, C507S212000, C507S213000, C507S269000

Reexamination Certificate

active

11011659

ABSTRACT:
The invention provides well drilling and servicing fluids, and methods of drilling, completing, or working over a well therewith, preferred fluids comprise an aqueous liquid, a water soluble polymer viscosifier (preferably xanthan gum), a polymeric fluid loss control additive (preferably a partially depolymerized partially crosslinked hydroxyalkyl ether derivative of starch or a hydroxyalkyl ether derivative of a partially crosslinked and partially depolymerized starch), a bridging agent comprising a particulate calcined magnesia that has an Activity Index greater than about 800 seconds, and an additive selected from the group consisting of citric acid, alkali metal salts of citric acid, ammonium citrate, and mixtures thereof in an amount sufficient to increase the low shear rate viscosity of the fluids, preferably from about 0.05–5 ppb, most preferably from about 0.15–3 ppb. The invention further provides a method of increasing the low shear rate viscosity of fluids which contain a water soluble polymer and a calcined magnesia bridging agent which has an Activity Index greater than about 800 seconds.

REFERENCES:
patent: 5514644 (1996-05-01), Dobson
patent: 6165947 (2000-12-01), Chang et al.
patent: 2004/0235675 (2004-11-01), Qiu

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