Reclosable circulating valve for use in oil well testing

Details Reclosable circulating valve for use in oil well testing Reclosable circulating valve for use in oil well testing

E - Fixed Constructions

21

B

166/4, 166/42

E21B 43/12 (2006.01) E21B 34/10 (2006.01) E21B 49/00 (2006.01) E21B 49/08 (2006.01)

Patent

CA 1094943

Docket No. PC-996 ABSTRACT Disclosed is a circulation valve for use in the testing of an oil well wherein the circulation valve may be reclosed by application of well annulus pressure to allow a subsequent treating or testing program. A spring means is subjected to well annulus pressure on two ends of a volume of fluid. The volume of fluid is divided by a dividing means which includes pressure relief means such that fluid on one side of the dividing means is either higher or lower than the well annulus pressure. This dif- ferent pressure is applied to one set of a piston means, and the other side of the piston means is subject to well annulus pressure such that movement of the piston means may be controlled by changing the well annulus pressure. An indexing means is additionally disclosed which controls opening of the circulation valve after a selected number of piston means movements, and which closes the circula- tion valve upon a selected movement of said piston means when the circulation valve is in the open condition.

308889

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