Wellbore isolation devices and methods of use to prevent pump offs

摘要

Disclosed is a downhole tool that includes a housing coupled to a wellbore isolation device, a tension-actuated valve arranged within the housing and having a first piston movably arranged within a first piston chamber, the first piston being coupled to a conveyance such that tension in the conveyance is transmitted to the first piston, wherein, when the tension in the conveyance is reduced, the first piston is moved within the first piston chamber such that wellbore fluids are able to enter the first piston chamber, and a pressure-actuated valve arranged within the housing and having a second piston movably arranged within a second piston chamber to place the second piston chamber in fluid communication with the first piston chamber, wherein a pressure drop across the downhole tool allows the second piston to move such that the wellbore fluids pass into the second piston chamber and through the wellbore isolation device.

主权项

1. A downhole tool, comprising:
a housing coupled to a wellbore isolation device; a tension-actuated valve arranged within the housing and having a first piston movably arranged within a first piston chamber, the first piston being operatively coupled to a conveyance such that tension in the conveyance is transmitted to the first piston, wherein, when the tension in the conveyance is reduced, the first piston is moved within the first piston chamber such that wellbore fluids are able to enter the first piston chamber; and a pressure-actuated valve arranged within the housing and having a second piston movably arranged within a second piston chamber in order to place the second piston chamber in fluid communication with the first piston chamber, wherein, upon experiencing a pressure drop across the downhole tool, the second piston is moved within the second piston chamber such that the wellbore fluids are able to pass into the second piston chamber and through the wellbore isolation device, thereby reducing hydraulic forces on the downhole tool when the tension in the conveyance is restored.