DEEPSET WIRELINE RETRIEVABLE SAFETY VALVE
The present invention generally relates to a deepset wireline retrievable safety valve for controlling fluid flow through a production tubing string. In one aspect, a valve for use in a wellbore is provided. The valve includes a housing having a bore. The valve further includes an actuator sleeve movable within the housing between a retracted position and an extended position. The actuator sleeve in the retracted position allows a flapper member to obstruct the bore in the housing. Additionally, the valve includes a first piston member attached to a first side of the actuator sleeve and a second piston member attached to a second side of the actuator sleeve, wherein wellbore fluid pressure acts on the first piston member, which results in a first force, and acts on the second piston, which results in a second force, and the first force and the second force are applied to the actuator sleeve in an opposite direction.
1 . A valve for use in a wellbore, the valve comprising:
a housing having a bore;
an actuator sleeve movable within the housing between a retracted position and an extended position, wherein the actuator sleeve in the retracted position allows a flapper member to obstruct the bore in the housing; and
a first piston member attached to a first side of the actuator sleeve and a second piston member attached to a second side of the actuator sleeve, wherein wellbore fluid pressure acts on the first piston member, which results in a first force, and acts on the second piston, which results in a second force, and wherein the first force and the second force are applied to the actuator sleeve in opposite directions.
2 . The valve of claim 1 , wherein the first piston member is in fluid communication with a control line.
3 . The valve of claim 2 , wherein the fluid from the control line acts on a first end of the first piston member and the wellbore fluid pressure acts on a second end of the first piston member.
4 . The valve of claim 1 , wherein the second piston member is in fluid communication with a cavity in the housing.
5 . The valve of claim 4 , wherein the fluid in the cavity acts on a first end of the second piston member and the wellbore fluid pressure acts on a second end of the second piston member.
6 . The valve of claim 1 , further comprising a spring attached to the actuator sleeve, the spring being configured to bias the actuator sleeve in the retracted position.
7 . The valve of claim 6 , wherein the spring is configured to apply a force on the actuator sleeve that is greater than a force that results from hydrostatic pressure acting on the first piston member.
8 . A valve for use in a wellbore, the valve comprising:
a housing having a bore;
an actuator sleeve movable within the housing between a retracted position and an extended position, wherein the actuator sleeve in the retracted position allows a flapper member to obstruct the bore in the housing;
a first piston member attached to a first side of the actuator sleeve, the first piston member being in fluid communication with a control line;
a second piston member attached to a second side of the actuator sleeve, the second piston member being in fluid communication with a cavity in the housing; and
a biasing member configured to bias the actuator sleeve in the retracted position.
9 . The valve of claim 8 , wherein the actuator sleeve is movable from the retracted position to the extended position in response to fluid pressure acting on the first piston member.
10 . The valve of claim 8 , wherein the biasing member is configured to apply a force on the actuator sleeve that is greater than a force that results from hydrostatic pressure acting on the first piston member.