ZERO DRILL COMPLETION AND PRODUCTION SYSTEM

摘要

The present invention is a method and apparatus for the completion of wells in which the production tube is run and cemented with only one downhole trip into the well. The completion tool string includes a pressure activated cementing valve, an external casing packer, a pressure activated production valve and a plug landing collar. This tool series is assembled near the end of a production tube string between a well production screen and a well production packer. With the production screen in place, an opening pump-down plug is delivered against the landing collar to seal the internal bore of the tube string below the pressure actuated production valve. Fluid pressure within the tube string is raised to inflate the external casing packer against the borehole wall or casing. Additional pressure increase opens the pressure actuated cementing valve. The desired quantity of cement is pumped down the tubing bore and through the cementing valve into the borehole annulus. Cement flow is forced toward the up-hole direction by the external casing packer which blocks the annulus below the cementing valve. A closing pump-down plug caps the cement volume and is driven down the tubing bore by water or other well working fluid. The closing plug engages a valve closing seat in the cementing valve. Increased fluid pressure behind the closing plug first closes the cementing valve and second, shears the seat retaining pins to drive the closing plug against the fluid column between the two plugs. The resulting fluid pressure increase opens the pressure actuated production valve to purge the residual cement between the plugs and open a well fluid flow path around the plugged landing collar into the production flow tube.