Formation tester tool assembly and methods of use
First Claim
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 draw down cylinder slidably retaining a draw down piston, said draw down piston actuatable between a first position and a second position and said draw down cylinder in fluid communication with said extendable sample device; and
a flow line between said extendable sample device and said draw down cylinder, said bore and said flow line to receive at least formation fluid from the earth formation.
1 Assignment
0 Petitions
Accused Products
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.
109 Citations
28 Claims
-
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 draw down cylinder slidably retaining a draw down piston, said draw down piston actuatable between a first position and a second position and said draw down cylinder in fluid communication with said extendable sample device; and
a flow line between said extendable sample device and said draw down cylinder, said bore and said flow line to receive at least formation fluid from the earth formation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A downhole apparatus comprising:
-
a drill string including a drill bit at a distal end of the drill string and a drill collar having an outer surface for interaction with an earth formation, said drill collar disposed near said drill bit;
an annulus surrounding said drill string, said annulus having a fluid pressure;
an extendable sample device having a sampling member to extend beyond said outer surface;
a hydraulic circuit having a fluid pressure; and
a hydraulic reservoir accumulator, said hydraulic reservoir accumulator in fluid communication with said annulus and said hydraulic circuit such that said reservoir accumulator communicates said annulus fluid pressure to said hydraulic circuit. - View Dependent Claims (12, 13, 14)
-
-
15. A method of operating a downhole apparatus comprising:
-
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;
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; and
accumulating a fluid pressure in the hydraulic circuit. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
Specification