Oil-free, water-soluble, hydroxyethyl cellulose, liquid,...

E - Fixed Constructions – 21 – B

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E21B 43/22 (2006.01) B01J 13/00 (2006.01) C08L 1/28 (2006.01) C08L 71/02 (2006.01) C09K 3/00 (2006.01) C09K 8/10 (2006.01) C09K 8/514 (2006.01) C09K 8/60 (2006.01) C09K 8/90 (2006.01)

Patent

CA 2233551

The present invention is directed to an oil-free, water-soluble, liquid, polymer dispersion for use in thickening aqueous mediums, particularly completion and workover fluids used in the oil and gas drilling business. The dispersions of the present invention are comprised of hydroxyethyl cellulose and propylene glycol derivatives, preferably both propylene glycol polyether polyols and an aliphatic propylene glycol ether. Optionally these dispersions include water. Because of their low toxicity, these dispersions are particularly useful for drilling in offshore environments. These compositions rapidly disperse in and viscosify a variety of brines, including sea water and other light brines, with minimum shear and without fisheye formation.

Dispersion polymère liquide, exempte d'huile, soluble dans l'eau, à utiliser pour épaissir des milieux aqueux, notamment pour le finissage ou le reconditionnement des fluides utilisés dans l'exploitation du pétrole et du gaz. Les dispersions visées par la présente invention sont constituées de dérivés d'hydroxycellulose et de propylène-glycol, de préférence à la fois de polyols de polyéther propylène-glycol et d'un éther de propylène-glycol aliphatique. Ces dispersions comprennent facultativement de l'eau. En raison de leur faible toxicité, elles se révèlent particulièrement utiles pour le forage au large des côtes. Ces compositions se dispersent rapidement et entraînent la viscosité de diverses saumures, notamment de l'eau de mer et d'autres saumures légères, avec un minimum de dégradation de la viscosité au cisaillement et sans formation d'oeils-de-poisson.

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