FIELD: oil recovery technique; shutting-off well for conducting repair jobs. SUBSTANCE: oil-well pump is provided with cylinder, plunger, suction and delivery valves and subsurface safety valve secured in oil well tubing. Subsurface safety valve is made in form of ball valve whose ball 1 is engageable with spring-loaded rod held by ball. Cylinder of oil-well pump is provided with end-piece which is passed through hole of valve seat and is engageable with ball. EFFECT: reliability. 3 dwg
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Authors
Dates
1997-12-10—Published
1995-10-06—Filed