STIMULATION OF OIL AND GAS WELLS WITH PHOSPHATE ESTER SURFACTANTS

摘要

STIMULATION OF OIL AND GAS WELLS WITHPHOSPHATE ESTER SURFACTANTSABSTRACT:Crude oil and gas production wells, which no longerproduce oil or gas utilizing conventional primary andsecondary means of recovery, can be returned to produc-tion by treatment comprising addition of a non-aqueoussolution of certain phosphate ester surfactants followedby successive treatment with water or a hydrocarbon.Increased production also can be obtained in low-produ-cing oil and gas wells by similar treatment with certainphosphate ester surfactants. Subsequent to treatment ofa producer well, the phosphate ester surfactant isforced into the formation utilizing water or a hydro-carbon and said surfactant is allowed to remain in theproducing well, for an effective period of at least 12hours. Thereafter, pumping and/or conventional fluiddrive means are then utilized to recover oil or gas fromthe subterranean oil or gas formation. The amount ofnon-aqueous surfactant solution utilized is sufficientto permeate the oil or gas subterranean formation in thearea immediately adjacent to the producing well bore andup to a radius therefrom of about 20 feet.