Aphron-containing aqueous well drilling and servicing fluids

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

C - Chemistry, Metallurgy

09

K

C09K 8/20 (2006.01) C09K 8/08 (2006.01)

Patent

CA 2359844

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 viscosifier which increases the low shear rate viscosity of the fluid to at least 10,000 centipoise, an aphron-generating surfactant, and aphrons, wherein the fluid contains less than about 20 % 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 re-circulating, while drilling, such a drilling fluid.

L'invention concerne un procédé et un fluide de forage ou d'entretien d'un puits dans une formation souterraine présentant des zones de circulation perdues ou des réservoirs épuisés, à basse pression. Ce fluide contient un liquide aqueux comprenant à l'état dispersé un améliorant de viscosité qui augmente la viscosité à faible vitesse de cisaillement du fluide à au moins 10 000 centipoises, un tensioactif générant des aphrons, et des aphrons. Ce fluide contient moins d'environ 20 % en volume d'aphrons, générés de préférence par la turbulence et la baisse de pression à mesure que le fluide sort du trépan au voisinage de la formation. Le procédé de forage d'un puits dans une formation souterraine consiste à faire recirculer continuellement, pendant le forage, un tel fluide de forage.

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