FIELD: engines and pumps.
SUBSTANCE: proposed pump unit comprises pump, casing and rod strings. Compensators are made up of branch pipes that form chambers. Said chamber represents a coaxial tube accommodating coaxial elastic web to produce, together with outer tube, a tight work chamber. Top part of the latter accommodates spring-loaded valve. Tube arranged on inner side of aforesaid elastic web is perforated via equal intervals in both axial and radial direction.
EFFECT: higher efficiency lower probability of casing string breakage.
2 dwg
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RU2358091C2 |
