Hydraulic control security valve

Abstract

The invention discloses a hydraulic controlling safety valve, which comprises an external shell. Two level axle holes and an axle hole of the sucker rod are arranged inside the external shell; a flap main valve core provided with a sealing part, a thrust piston with boss and a main end cover pressed on the axle end of the first level axle hole are symmetrically arranged sideways in the first level axle hole; a main spring is arranged on the piston rod between one side of the boss on the thrust piston and the main end cover; an oil-guide groove and an auxiliary oil-guide groove are arranged onthe front end and the back end of the sleeve respectively; an axle hole boss, an auxiliary piston and an auxiliary end cover pressed on the axle end of the second level axle hole are symmetrically arranged in sequence in the second level axle hole, and a spring is arranged between the axle hole boss and the auxiliary piston. The safety valve adopting the valve can close the annular space between the well bore and the sucker rod reliably after controlling the pressure release, and at the same time, the hydraulic controlling safety valve can indicate the on / off state of the valve core, control the motor to stop indirectly outside the valve, and avoid grinding and breaking the rotating sucker rod after the valve core is closed.

Description

technical field [0001] The invention relates to a safety valve, in particular to a hydraulic control safety valve. Background technique [0002] The dynamic sealing device used in the driving device of surface driven rod drive screw pump has limited pressure bearing capacity, and is easy to be damaged when the well fluid pressure fluctuates violently, causing crude oil leakage to seriously pollute the equipment and the environment. Wellhead safety valve is an important well control equipment in oil production equipment. With the corresponding control system, it can effectively control blowout and well kick, and protect the power unit above the valve from damage. At present, most of the wellhead safety valves used in the field are manual and hydraulic ram-type valves, which cannot adapt to the sucker rod located in the center of the wellhead for ground-driven rod-driven screw pumps, and the safety valves attached to the existing screw pump drivers are all Manual operation ha...

AI Technical Summary

Problems solved by technology

At present, most of the wellhead safety valves used in the field are manual and hydraulic ram-type valves, which cannot adapt to the sucker rod located in the center of the wellhead for ground-driven rod-driven screw pumps, and the safety valves attached to the existing screw pump drivers are all Manual operation has the disadvantages of slow movement of the spool, poor reliability, high labor intensity, and the inability to connect to the automatic control system of the safety valve. At present, there is no hydraulic control safety valve suitable for ground-driven rod-driven screw pumps.

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