COUPLINGS FOR WELL PUMPING COMPONENTS

• Main Authors: NIELSEN, Diane M, NIELSEN JR., William D
• Format: Patent
• Language: English
• Published: 21.07.2022
• Subjects: ALLOYS; BLASTING; CHEMISTRY; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; ENGINEERING ELEMENTS AND UNITS; FERROUS OR NON-FERROUS ALLOYS; FIXED CONSTRUCTIONS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS

A coupling for joining a downhole pump to a sucker rod string includes a core having a first end, a central portion, and a second end. The first end and the second end each have an end surface. The first end tapers linearly inwards from the central portion to the first end surface, and a diameter of the first end surface is less than a diameter of the second end surface. The coupling is made from a spinodally-hardened copper nickel-tin alloy and has a sliding coefficient of friction of less than 0.4 when measured against carbon steel. A sucker rod string comprises a sucker rod, a valve rod bushing and the coupling. A threaded bore runs entirely through the coupling core from the first end to the second end. The threaded bore at the first end is complementary with an external thread of the valve rod bushing, and at the second end is complementary with an external thread of the sucker rod. A method of extracting a fluid from a well, and a pump system, including the coupling are also disclosed.