Wire-line controlled down-hole shut-in tool for wells

Wells – With below and above ground modification – Above ground actuating means for below ground device

Patent

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Details

166183, 166324, 166334, E21B 3410

Patent

active

046870555

ABSTRACT:
A wire-line controlled down-hole shut-in tool for wells incorporates a mandrel adapted for connection in a tubing string. A shut-in valve mechanism within the mandrel is opened and maintained in its open position by a sectioned flow tube assembly and is permitted to close upon linear retraction of the flow tube thus causing temporary shut-in of the well such as for purposes of inspecting formation pressure. The shut-in tool mechanism incorporates a pressure equalization system which is controlled by downward linear movement of the flow tube assembly for establishing a pressure balanced condition at the shut-in valve to permit opening of the valve without excessive force. Pressure balancing with the shut-in valve in its closed position is achieved by control of pressure equalization valves in response to actuation of a lost-motion connection between upper and lower sections of the elongated flow tube assembly.

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Flopetrol Johnston, "MUST"-Universal DST Real Time Surface Pressure Read Out.

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