Method and apparatus of locking closed a subsurface safety system
AssigneeCamco International Inc.
InventorsDanny W. Wagoner, David L. Parker, Arthur J. Morris
Life of this patent
Estimating the term…
Abstract
Locking closed a subsurface safety system in a well production tubing from the well surface by releasably holding the subsurface safety valve in the open position. Thereafter closing the subsurface safety system from the well surface through a control line extending exteriorly of the production tubing. Thereafter preventing the safety system from being opened through the control line.
Claims9
A method of locking closed a subsurface actuated safety system in a well production tubing from the well surface comprising,
- releasably holding the subsurface safety system in the open position allowing well production through the production tubing,
- closing the subsurface safety system from the well surface through a control line extending from the safety system to the well surface exteriorly of the bore of the production tubing, and
- preventing the safety system from being opened through the control line,
- said control line is a hydraulic control line and including the step of venting the hydraulic control line at a subsurface location.
A method of locking closed a subsurface actuated safety system in a well production tubing from the well surface comprising,
- releasably holding the subsurface safety system in the open position allowing well production through the production tubing,
- closing the subsurface safety system from the well surface through a control line extending from the safety system to the well surface exteriorly of the bore of the production tubing, and
- preventing the safety system from being opened through the control line,
- wherein the step of preventing the safety system from being opened includes,
- mechanically locking the safety system in the closed position inside of the production tubing.
A subsurface controlled lock closed subsurface safety system comprising,
- a subsurface safety system in an well production tubing controlling the flow of well fluids through the tubing,
- a control line extending from the well surface to the safety system exteriorly of the production tubing for controlling the opening and closing of the safety system, and
- subsurface means connected to the control line and actuated by the control line for preventing the safety system from being opened by the control line.
A subsurface well safety valve comprising,
- a housing having a bore therethrough,
- a valve closure member in the bore moving between open and closed positions for controlling the fluid flow through the bore,
- a flow tube telescopically movable in the housing for controlling the movement of the valve closure member,
- biasing means in the housing urgin the flow tube in a direction to close the valve,
- releasable latch means in the housing releasably holding the flow tube in a position holding the valve in the open position, and
- actuating means in the housing adapted to be connected to a control line extending to the well surface, said actuating means engagable with the releasable latch means for releasing the flow tube and closing the valve.
A method of locking closed and opening a surface actuated safety system in a well production tubing from the well surface comprising,
- releasably holding the subsurface safety system in the open position allowing well production through the production tubing,
- closing the subsurface safety system from the well surface through a control line extending from the safety system to the well surface exteriorly of the bore of the production tubing,
- preventing the safety system from being opened through the control line, and
- when desired to open the subsurface system, lowering a wireline tool through the production tubing to the subsurface safety system and resetting the subsurface safety system with the lowered tool.
Dependencies are inferred from the claim text.