Formation tester tool assembly and methods of use
First Claim
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1. A downhole apparatus comprising:
- a drill collar having an outer surface for interaction with an earth formation;
an extendable sample device having a bore and recessed beneath said outer surface in a first position to extend beyond said outer surface to a second position;
a first draw down chamber slidably retaining a first draw down piston, said first draw down piston actuatable between a first position and a second position and said first draw down chamber in fluid communication with said extendable sample device;
a flow line between said extendable sample device and said first draw down chamber, said bore and said flow line to receive at least formation fluid from the earth formation; and
a second draw down chamber slidably retaining a second draw down piston, said second draw down chamber in fluid series with said first draw down chamber and said extendable sample device.
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Abstract
A downhole, extendable testing apparatus and methods of use are described and claimed herein. In one embodiment, an extendable sample device is connected to a draw down piston assembly. A position indicator may be used to show the position of the draw down piston during movement, and the draw down piston may be stopped and re-started, and moved at different rates. A filter may be used to clean fluids drawn into the extendable sample device. In another embodiment, the extendable sample device may connected to a hydraulic circuit. The hydraulic circuit may include accumulators for accumulating fluid pressures and operating the apparatus. Further apparatus and methods are disclosed herein.
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Citations
28 Claims
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1. A downhole apparatus comprising:
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a drill collar having an outer surface for interaction with an earth formation; an extendable sample device having a bore and recessed beneath said outer surface in a first position to extend beyond said outer surface to a second position; a first draw down chamber slidably retaining a first draw down piston, said first draw down piston actuatable between a first position and a second position and said first draw down chamber in fluid communication with said extendable sample device; a flow line between said extendable sample device and said first draw down chamber, said bore and said flow line to receive at least formation fluid from the earth formation; and a second draw down chamber slidably retaining a second draw down piston, said second draw down chamber in fluid series with said first draw down chamber and said extendable sample device. - View Dependent Claims (2, 3)
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4. A downhole apparatus comprising:
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a drill collar having an outer surface for interaction with an earth formation; an extendable sample device having a bore and recessed beneath said outer surface in a first position to extend beyond said outer surface to a second position; a draw down chamber slidably retaining a draw down piston, said draw down piston actuatable between a first position and a second position and said draw down chamber in fluid communication with said extendable sample device; a flow line between said extendable sample device and said draw down chamber, said bore and said flow line to receive at least formation fluid from the earth formation; and a position indicator in communication with said draw down chamber to signal a position of said draw down piston. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a downhole apparatus comprising:
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disposing a drill collar in a borehole, the drill collar comprising an extendable sample device, a hydraulic circuit and a draw down piston assembly; extending a sampling member from the extendable sample device beyond the drill collar; moving a piston of the draw down piston assembly; drawing a fluid into the extendable sample device and a flow line connecting the extendable sample device and the draw down piston assembly; accumulating a fluid pressure in the hydraulic circuit; diverting a hydraulic fluid from a retract side of the sampling member; directing the fluid to the extend side of the sampling member; and providing an additional extending force to the extend side of the sampling member. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification