Downhole Rod Pumps with Straightening Elements of the Cylinder

Abstract

The reliability of borehole pumps in general and its individual components is ensured during their design and manufacture. It depends on the features of the design, on the quality of manufacturing of their constituent parts, the quality of the assembly of the borehole pump as a whole and their components, as well as a number of other indicators of the technological process. The level of reliability laid down during development and ensured by production is further determined by operating conditions and other operational factors. The relevant theoretical and experimental studies of the factors affecting the operation of a downhole pump have shown that it is possible to increase the reliability of the design and the efficiency of its operation by: (1) finding ways to protect friction surfaces from the impact of abrasive, ways to level the wear of rubbing pairs in different sections; improving the design of downhole pumps in general and finding the optimal combination of configuration of the elements of the units and their interfaces, which have stable operation in the appropriate operating conditions; (2) neutralizing the causes that cause complications in the operation of the downhole pump, and finding ways to eliminate them. To solve the tasks in the indicated direction, we have chosen a constructive-technological method. According to the above, a number of variants of borehole pumps, their components and parts were developed, including: borehole pump with a sealing element in the gap between the casing and bushings; borehole pump with cylinder rectifying device; borehole pumps with centering devices in two versions; borehole pump with forced suction valve; borehole pump with a rotating plunger; special plunger resistant to abrasive wear; downhole pump resistant to hydroerosive wear, downhole pump without volume loss of liquid and with forced filling of the cylinder; downhole pump for pumping gas–liquid mixtures; a valve assembly with a ball deflector and a downhole pump with elements with minimal hydraulic resistance. This article describes the design features of the proposed developments, the principle of their operation and the necessary calculations for their implementation.