Method and apparatus for stopping well production

Details Method and apparatus for stopping well production Method and apparatus for stopping well production

1984-08-29

1986-04-29

Novosad, Stephen J.

Wells

Processes

Placing or shifting well part

166319, 166323, E21B 3408

Patent

active

045850674

ABSTRACT:
A method and valve for stopping production of an oil and/or gas well by injecting a fluid from the outside of a well conduit into the well bore through a check safety valve. The valve, initially in the open position, is actuated to the closed position by an increase of the pressure outside of the conduit relative to the inside pressure. A communication path from the outside of the conduit to the inside of the conduit above the safety valve is opened by pressure in the conduit below the closed safety valve. Fluid is injected into the open communication path through the safety valve to kill well production while maintaining a safety check on the production fluid below the safety valve. The valve may be relatched to its initial open position and reactuated.

REFERENCES:
patent: 3750752 (1973-08-01), Mott
patent: 4161960 (1979-07-01), Watkins

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