초록 ▼

A gas anchor is attached to the lower end of a downhole pump located downhole in a borehole so that fluid must flow from the lower borehole, into the gas anchor, to the suction of the pump, and to the surface of the ground. The gas anchor has a metal rod located within an outer housing. An annulus i

A gas anchor is attached to the lower end of a downhole pump located downhole in a borehole so that fluid must flow from the lower borehole, into the gas anchor, to the suction of the pump, and to the surface of the ground. The gas anchor has a metal rod located within an outer housing. An annulus is formed between the housing interior and the outer surface of the rod. Both the housing and rod are made of a special alloy. The housing has a multiplicity of ports formed therein. Formation fluid located in the bottom of the borehole flows through the ports, into the housing, along the annulus between the housing and the rod, and into the pump intake. This action subjects the formation fluid to treatment prior to the fluid entering the pump suction. Accordingly, the fluid that must flow through the downhole pump, production tubing, and downstream flow lines are treated by the action of the special alloy from which the housing and central core are cast, thereby causing significant reduction in scale and corrosion of the metal surfaces that come in contact with the produced fluid.

대표청구항 ▼

A downhole pump for use in a borehole which extends through a formation from which formation fluid flows into the borehole, said pump is located in said borehole and has a suction end for receiving formation fluid and an outlet end through which produced fluid flows into a tubing string and to the s

A downhole pump for use in a borehole which extends through a formation from which formation fluid flows into the borehole, said pump is located in said borehole and has a suction end for receiving formation fluid and an outlet end through which produced fluid flows into a tubing string and to the surface of the ground; the improvement comprising: a gas anchor attached to the suction end of the pump through which formation fluid must flow; said gas anchor a perforated housing and a core, said housing has attachment means at an upper end thereof by which it is removably affixed to the suction end of the pump; said housing has a closure means at the lower end thereof through which fluid flow is precluded; said core is contained within said perforated housing, an annular passage means formed between the core and the housing through which formation fluid must flow from the housing perforations to the pump suction; said core and said housing are made from an alloy having the following percent composition: copper: 40-66%; zinc: 2-28% nickel: 5-25%; lead: 2-12%; and tin: 1-5%; said core is an elongated rod having an outside diameter which is smaller than the housing inside diameter such that an annulus is formed therebetween, thereby forming said annular passage means; the lower marginal end of the housing is perforated while the upper marginal end thereof is imperforate; said core and said housing are cylindrical in cross-section configuration; said perforations are all located at the lower marginal end of the housing, and said rod has a lower marginal end located in the perforated lower marginal end of the housing and an upper marginal end of the rod is located in the upper imperforate marginal end of the housing so that all of the flow to the pump must occur through said perforations, along said annulus, and into the suction of the pump.