Aphron-containing well drilling and servicing fluids

Details Aphron-containing well drilling and servicing fluids Aphron-containing well drilling and servicing fluids

E - Fixed Constructions

21

B

E21B 21/14 (2006.01) C09K 8/20 (2006.01) C09K 8/575 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2280713

The invention provides a method and fluid for drilling or servicing a well in a subterranean formation containing lost circulation zones or depleted, low pressure reservoirs. The fluid comprises an aqueous liquid having dispersed therein a polymer which increases the low shear rate viscosity of the fluid to the extent that the thixotropic index of the fluid is at least about 10 and a surfactant, and wherein the fluid contains less than about 15 % by volume of aphrons preferably generated by the turbulence and pressure drop as the fluid exits the drill bit in the vicinity of the formation. The method of drilling a wellbore in a subterranean formation comprises continuously circulating, while drilling, such a drilling fluid.

L'invention porte sur un procédé et un fluide de forage et d'entretien d'un puits foré dans une formation souterraine contenant des zones à circulation perdue ou des réservoirs épuisés ou sous faible pression. Ledit fluide consiste en un liquide aqueux où sont dispersés un polymère qui augmente la viscosité à faible vitesse de cisaillement du fluide et porte l'indice thixotropique du fluide à au moins environ 10, et un tensio-actif, et qui contient moins d'environ 15 % en volume d'aphrons produits de préférence par des turbulences et des chutes de pression alors que le fluide sort du trépan au voisinage de la formation. L'invention porte également sur un procédé de forage d'un puits dans une formation souterraine consistant à faire circuler en permanence le susdit fluide pendant le forage.

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