Deepset wireline retrievable safety valve

Abstract

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.