OIL-WELL SUCKER-ROD PUMP

摘要

FIELD: oil industry; pumping out of oil from deep wells. SUBSTANCE: inner and outer threaded surfaces are made on pump members interconnected by threaded conjugations. Threaded surfaces are provided with conical hole and spherical projection with side recess. Value of radius of spherical projection is specified by relationship given in description of invention. EFFECT: enlarged operating capabilities. 3 dwgt