Flow control hanger and polished bore receptacle

摘要

A completion system is provided for completing downhole wells, comprising an upper polished bore receptacle incorporated into an intermediate casing of the downhole well and formed with a honed inner bore. A bottom packer for supporting a completion string within the intermediate casing has a first sealing assembly for sealing engagement against the inner bore of the upper polished bore receptacle. A lower polished bore receptacle is further incorporated into the intermediate casing and formed with a honed inner bore. A flow control hanger in the form of a hollow mandrel hangs a production liner in the intermediate casing and has a second sealing assembly for sealing engagement against an inner bore of the lower polished bore receptacle. A further completion system is provided comprising a polished bore receptacle (PBR) and a latch down packer having a lower end to which the PBR is connected.

主权项

1. A completion system for completing downhole wells, said system comprising;
a. an upper polished bore receptacle (PBR) incorporated into an intermediate casing of the downhole well and formed with a honed inner bore; b. a bottom packer for supporting a completion string within the intermediate casing and having a first sealing assembly for sealing engagement against an inner bore of the upper polished bore receptacle; said first sealing assembly comprising:
i. a mandrel having at least one threaded connection at an end of the mandrel to mate to the completion string;ii. one or more end caps threaded to an outside diameter of the mandrel and having angled faces;iii. one or more pairs of end seals made of high temperature and pressure resistant stainless steel;iv. one or more mid seals made of high temperature and pressure resistant stainless steel and placed between each pair of end seals;
wherein each of the one or more pairs of end seals include a controlled width cut along a length of the end seal, an angled taper on a first side of the end seal to mate with the angled face of the end caps or an angled face of a spacer ring, a shouldered face on a second side of the end seal to mate to a shouldered face of the mid seal, and one or more pin pockets located on the shouldered face of the end seal; c. a lower polished bore receptacle (PBR) incorporated into the intermediate casing and formed with a honed inner bore; and comprising a no-go in the form of a smaller than honed inside diameter proximal a bottom end of the lower PBR; d. a flow control hanger (FCH) in the form of a hollow mandrel for hanging a production liner in the intermediate casing and having a second sealing assembly for sealing engagement against an inner bore of the lower polished bore receptacle, said second sealing assembly comprising:
i. a mandrel having at least one threaded connection to mate to the production liner and a flat faced stop shoulder;ii. one or more end caps threaded to an outside diameter of the mandrel and having an angled face;iii. one or more split seals made of high temperature and pressure resistant stainless steel; andiv. one or more stop rings,wherein the no-go on the lower PBR serves to prevent passage of the FCH through the lower PBR.