Well perforating method for solution well mining

Details Well perforating method for solution well mining Well perforating method for solution well mining

E - Fixed Constructions

21

B

166/10

E21B 29/00 (2006.01) E21B 43/114 (2006.01) E21B 43/28 (2006.01)

Patent

CA 1082099

An improved method of solution well mining is provided which, among other advantages, enhances the injectivity of the wells and eliminates the need for underreaming and the use of well screens. In solution well mining, a leaching solution is pumped into an injection well so as to flow through a mineralize zone to a plurality of production wells, the solution which contains the mineral to be recovered being pumped out of the production wells. The invention provides for using a high pressure water jet to perforate the cemented casings of the well so as to, inter alia, enhance injectivity and provide sand control. The perforations are arranged in a preselected non- uniform pattern in the production well, with the density being the greatest at the bottom of the zone, so as to promote uniform flow of the solution.

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