Patent ID: 7926571

Claim:
A method of petroleum-production from at least one open hole in at least one petroleum production zone of an oil and/or gas well comprising the steps of: locating a plurality of selectively-openable sliding valves spaced apart along a production tubing at predetermined locations, wherein at least one of said plurality of selectively-openable sliding valves is a ball-and-seat valve; inserting said plurality of selectively-openable sliding valves and said production tubing into said at least one open hole; cementing said plurality of selectively-openable sliding valves and said production tubing permanently in place in said at least one open hole, said predetermined locations along said production tubing being in said petroleum production zone in said at least one open hole; selectively opening said at least one of said plurality of said selectively-openable sliding valves; selectively removing some of said cement adjacent said plurality of selectively openable sliding valves without using jetting or cutting tools to establish access therefrom to said at least one petroleum production zone; selectively fracing through said selectively opened of said plurality of said selectively-openable sliding valve with fracing material; and selectively producing said at least one petroleum production zone through said plurality of said selectively-openable valves in said open hole of said oil and/or gas well that has been (a) selectively opened and (b) selectively removed and/or fraced.