E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/4
E21B 33/03 (2006.01)
Patent
CA 1061246
ABSTRACT OF THE DISCLOSURE In the testing of an underground formation intersected by a fluid filled well bore extending from the earth's surface to the formation, wherein the formation is tested with a test- ing string having a flow passage therethrough, a normally closed valve in the lower portion of the testing string for opening and closing the flow passage, and a weight and pressure respon- sive valve located in the testing string adjacent said normally closed valve for closing the flow passage responsive to weight and opening the flow passage responsive to pressure, a method comprising the steps of: lowering the testing string into the well bore to the formation depth; isolating the formation from the fluid pressure in the well bore above the formation; apply- ing weight to the weight and pressure responsive valve, thereby closing the flow passage adjacent the normally closed valve; opening the normally closed valve subsequent to the closing of the weight and pressure responsive valve; and, increasing the fluid pressure in the well bore above the formation, thereby opening said weight and pressure responsive valve to provide fluid communication between the surface and the formation.
309038
Barrington Burchus Q.
Farley David L.
Hortman Norman G.
Nix George J.
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