Metal lined metal pump barrel

Claim 1

In a subterranean oil well sucker rod type of pump for use in pumping well fluids from a deep borehole in the earth, including a string of tubing supporting a working barrel for said pump, and a string of sucker rods to reciprocate the pump piston in said working barrel, the improvement in said working barrel comprising: a. a long tubular pipe of rigid metallic construction, the inside periphery adjacent each end beveled outwardly, said pipe including male threads at each outside end; b. a thin-walled tubular liner of stainless steel extending within said pipe, along its entire length, the ends of said liner beveled outwardly against said beveled portions adjacent each end of said pipe, said liner forming the inner periphery of said barrel for said pump piston for at least the operative stroke of said pump; c. the ends of said pipe and said liner united, as by welding, at each end of said barrel at a diameter intermediate the internal diameter of said liner and the root diameter of said threads, to form a tight seal between said pipe and said liner.