Patent ID: 9739130
Date: 2017-08-22
CPC Classifications: E21B,F04B

Claim:
1. In a fluid end of a reciprocating pump for delivery of fracking fluid at high pressure into a well for recovery of oil and natural gas trapped in shale rock formations, said fluid end having at least one fluid cylinder assembly including: a body having a first bore which includes a reciprocating plunger; a second bore which includes a suction valve; and a third bore which includes a discharge valve, said first bore being substantially perpendicular to both said second and third bores which are in flow communication with each other, an outlet of said second bore and an inlet of said third bore defining a chamber with said first bore that receives a reciprocating plunger for drawing fracking fluid into said chamber at low pressure and discharging said fracking fluid at high pressure; the improvement comprising: at least one tubular sleeve in said first bore, substantially the entire length of the outer cylindrical surface of said tubular sleeve configured to be in intimate, surface-to-surface direct contact with the surface of said first bore that surrounds said at least one tubular sleeve; at least one tubular cartridge in a fluid passage defined by said second and third bores, substantially the entire length of the outer cylindrical surface of said at least one tubular cartridge configured to be in intimate, surface-to-surface direct contact with the surfaces of said second and third bores that surrounds said at least one tubular cartridge; a fluid-tight seal between contacting surfaces of said at least one tubular sleeve and said at least one tubular cartridge, said fluid tight seal being formed between an outer cylindrical surface on one of said at least one tubular sleeve and said at least one tubular cartridge being in sealing contact with an annular interior-facing edge surface of the other of said at least one tubular sleeve and at least one tubular cartridge; said at least one sleeve and said at least one cartridge, when installed in said fluid end cylinder assembly, cooperating to overlie the fluid end body portions that surround each of them and to protect them from direct impingement thereon by high pressure fracking fluid passing through said fluid end cylinder assembly.