Apparatus, method and system for measuring formation pressure and mobility

摘要

An apparatus, method and system are provided for characterizing fluid trapped in a subterranean formation using a downhole tool that includes an elongated body and a probe body. The probe body is moveable from and back into the elongated body. The probe body defines a flow line and supports a pressure sensor for measuring fluid pressure in the flow line, a piston and an electrical motor actuator that is adapted to move the piston in order to vary volume of the flow line. The integral electrical motor actuator, piston, pressure sensor and flow line of the probe body can provide for measurement of formation pressure and/or formation mobility.

主权项

1. A tool for characterizing an earth formation surrounding a borehole having a borehole wall, the tool comprising:
an elongated body adapted for downhole operation in the borehole; and a probe body, moveable out of and back into the elongated body, the probe body defining a flow line and including
at least one sealing member configured to seal the borehole wall during operation of the tool,a shoe that supports the at least one sealing member,a barrel configured to contact the borehole wall to position a distal end of the fluid line at the borehole wall,a pressure sensor for measuring fluid pressure in said flow line,a piston, andan electrical motor actuator that is adapted to move said piston in order to vary volume of said flow line, wherein the barrel is moveable relative to the shoe such that the barrel is configured to maintain contact with the borehole wall while the shoe and the at least one sealing member are moved toward the borehole wall.