| 摘要 |
FIELD: borehole equipment used in oil production wells equipped, as a rule, with submersible pumps. SUBSTANCE: circulating check valve has body with upper and lower joining threadings. Body has cavity covered from above with separable lattice. Cavity communicates with outer space through side canal with vertical section. Body also has longitudinal canal communicated with the cavity. Seats are mounted in vertical section of side canal and in upper part of longitudinal canal. Seats are made in the form of conical bushes with cylindrical parts in lower sections. Ball valve is placed in cavity so, that it is capable to be on any seat and to move from one seat to another during change of liquid streams movement direction. During pumping set running-in at speed of 0.15 - 0.25 m/s ball valve being on seat in side canal just lifts a little to allow liquid from interpipe space to pass in lift string. As a version conical bushes are mounted at one level and fixed in canals using threading made on cylindrical parts of canals. Separable lattice has concave lower surface and radial bulges along periphery in ring-type drilling on body. To provide bulges passing during lattice setting in drilling threading there are vertical grooves. During lifting of equipment pump is isolated by ball valve. EFFECT: circulating check valve improves safe operation of oil wells running-in pump. |
