E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/46.1
E21B 34/10 (2006.01) E21B 43/01 (2006.01) E21B 49/00 (2006.01) E21B 34/00 (2006.01)
Patent
CA 1159364
?-S-PA-3S ABSTRACT OF THE INVENTION A test tool is provided for testing the production capabili- ties of a preselected formation subsequent to the drilling of a subterranean well. The test tool is part of a testing string which incorporates a packer which may be releasably engaged in the casing string at a depth immediately above a region where formation testing is desired. The test tool includes a rotary ball valve which is normally maintained in a closed position during the insertion of the tool into the well. After setting of the packer, the ball valve is opened by increasing the fluid pressure existing in the annulus between the casing and the testing string. Such annulus pressure is applied to a first reservoir of trapped fluid which may contain water, and supplies fluid at annulus pressure to one side of a valve operating piston to shift the operating piston to actuate the rotary ball valve to its open position and compress a piston return spring. A second reservoir maintains a pressure equal to the hydrostatic pressure in the well at the selected depth. The control valve for the ball valve piston is a piston exposed at opposite ends respectively to the two trapped fluids, and hence is shiftable to a valve opening position by an increase in fluid pressure in the first reservoir over that in the second reservoir, When annulus pressure is reduced, the trapped pressure and a compressed spring in the second fluid reservoir shifts the control valve to cause closing of the ball valve. An over pressure valve permits fluid pressure in the second reservoir to be increased in the event that a significant further increase in annulus pressure is encountered.
375427
Craig Gene C.
Borden Ladner Gervais Llp
Lynes Inc.
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