C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/16, 166/29
C09K 8/588 (2006.01) C09K 8/584 (2006.01)
Patent
CA 1162398
ABSTRACT OF THE DISCLOSURE: Crude oil and gas production wells, which no longer produce oil or gas utilizing conventional primary and secondary means of recovery, can be returned to production by treatment comprising addition of an aqueous solution of alkyl or aralkyl polyoxyalkylene phosphate ester surfactants follow- ed by successive treatment with a hydrocarbon. Increased production also can be obtained in low-producing oil and gas wells by similar treatment with certain phosphate ester surfactants. Subsequent to treatment of a producer oil or gas well, said phosphate ester surfactant is forced into the formation utilizing a hydrocarbon or water in the case of a gas well and said surfactant and hydrocarbon or water mixture is allowed to remain in the producing well, for an effective period of time ranging from not less than 24 hours to one month. Thereafter, pumping and/or conventional fluid drive means are then utilized to recover oil or gas from the sub- terranean oil or gas formation. The amount of aqueous surfactant solution and hydrocarbon or water utilized are sufficient to permeate the oil or gas subterranian formation in the area immediately adjacent to the producing well bore and up to a radius therefrom of about 20 feet. The process of the invention provides for the use of an aqueous solution of a phosphate ester rather than an oil-external or water- external micellar dispersion in the stimulation of oil and gas wells.
375359
Basf Wyandotte Corporation
Robic Robic & Associes/associates
LandOfFree
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