Modular check valve system

摘要

A modular check valve system for providing back pressure to a fluid flow having a housing with a seating end, a receiving end, a housing annulus, and a housing sealing surface. The modular check valve system can also have at least one cartridge insert fluidly connected to the housing. The cartridge insert can have a poppet engaging a cartridge housing sealing surface, a pair of O-rings positioned on the cartridge housing, and a rod secured to the poppet. The rod is configured to move the poppet from a sealed position to an open position. A spring guide with spring is disposed around the rod. A compression adjustment device is connected to the first rod opposite the spring guide to apply force to the rod sealing the poppet against the cartridge housing sealing surface and creating fluid back pressure in the housing annulus when the spring is decompressed.

主权项

1. A modular check valve system for providing back pressure to a fluid flow downhole comprising:
a. a housing; b. a first cartridge housing fluidly connected to the housing, the first cartridge housing comprising:
(i) a first poppet engaging a first cartridge housing sealing surface; and(ii) a first rod secured to the first poppet, the first rod configured to move the first poppet from a sealed position against the first cartridge housing sealing surface to an open position; c. an expanded cartridge housing fluidly connected to the first cartridge housing, the expanded cartridge housing comprising an expanded cartridge housing annulus; d. at least one cartridge insert installed in the expanded cartridge housing, the at least one cartridge insert comprising a cartridge insert poppet sealingly engaging a cartridge insert body, the cartridge insert poppet secured to a cartridge insert rod, the cartridge insert rod inserted longitudinally through the cartridge insert body and configured to move the cartridge insert poppet between a sealed position against the cartridge insert body and an open position; e. a second cartridge housing fluidly connected to the expanded cartridge housing, the second cartridge housing comprising:
(i) a second poppet engaging a second cartridge housing sealing surface; and(ii) a second rod secured to the second poppet, the second rod configured to move the second poppet from a sealed position against the second cartridge housing sealing surface to an open position; and f. an exit sub fluidly engaging the expanded cartridge housing and the second cartridge housing, the exit sub comprising a sub annulus extending between an exit and an entrance.