DOWNHOLE TOOL CONSISTENT FLUID CONTROL

摘要

A downhole apparatus for use in a wellbore includes a housing having at least one passage or cavity capable of receiving a fluid. The downhole apparatus further includes an orifice in fluid communication with the passage or cavity. A viscosity-altering member is positioned in proximity to the orifice and is capable of being activated to change the viscosity of the fluid and thus a rate at which the fluid is able to pass through the orifice.

主权项

1. A downhole tester valve for collecting a formation fluid for testing, the valve comprising:
a housing; a valve member positioned within the housing and selectively positionable in an open position or a closed position to allow or prevent fluid communication through a passage of the downhole tester valve; a liquid chamber positioned within the housing, the liquid chamber having a liquid with a selectively-adjustable viscosity, the liquid capable of directly or indirectly exerting a force on the valve member to move the valve member to at least one of the open position or the closed position; an orifice associated with the liquid chamber to allow the liquid to enter or exit the liquid chamber; and a viscosity-altering member capable of being activated to change the viscosity of the liquid and thus a rate at which the liquid is able to enter or exit the orifice, thereby controlling the application of the force by the liquid.