Formation pressure testing apparatus with flexible member and method of formation pressure testing
First Claim
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1. An apparatus for determining a pressure downhole comprising:
- a first chamber having a flexible member for accepting a first fluid downhole;
a second chamber containing a second fluid; and
the flexible member providing pressure communication between the first chamber and the second chamber, wherein the flexible member flexes from a first position to a second position to draw the first fluid into the first chamber and flexes from the second position to the first position to expel the fluid from the first chamber.
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Abstract
An apparatus and method for use in determining pressure at a formation of interest in-situ. A carrier carrying a tool is conveyed in a borehole. The tool includes a sealing member and a port exposable to the formation of interest. A formation fluid sampling chamber is separated from a hydraulic fluid chamber by a flexible member that allows pressure communication from the fluid sampling chamber to the hydraulic fluid chamber. A sensor senses pressure in the hydraulic fluid for determining pressure in the sampling chamber.
34 Citations
27 Claims
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1. An apparatus for determining a pressure downhole comprising:
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a first chamber having a flexible member for accepting a first fluid downhole; a second chamber containing a second fluid; and the flexible member providing pressure communication between the first chamber and the second chamber, wherein the flexible member flexes from a first position to a second position to draw the first fluid into the first chamber and flexes from the second position to the first position to expel the fluid from the first chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of determining a pressure of a fluid downhole comprising:
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conveying a tool into a borehole adjacent a formation; placing a first chamber in the tool in fluid communication with a first fluid in the formation; flexing a flexible member associated with the first chamber from a first position to a second position to draw the first fluid into the first chamber for determining the pressure of the fluid downhole and flexing the flexible member from the second position to the first position to expel the first fluid from the first chamber. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A system for use downhole comprising:
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a tool including; a sealing member and an associated port configured to obtain a first fluid from a formationl; a first chamber having a flexible member for accepting the first fluid; a second chamber containing a second fluid; a flexible member providing pressure communication between the first chamber and the second chamber, wherein the flexible member is adapted to move from a first position to a second position to draw the first fluid into the first chamber and to move from the second position to the first position to expel the first fluid from the first chamber; and a sensor configured to sense a characteristic of the second fluid; and a processor processing an output of the sensor to estimate formation fluid pressure. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification