Apparatus and method for drawing fluid into a downhole tool

• US 7,114,385 B2
• Filed: 10/07/2004
• Issued: 10/03/2006
• Est. Priority Date: 10/07/2004
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (SLB)
• Original Assignee: Schlumberger Technology Corporation (SLB)
• Inventors: Fisseler, Patrick J., Palmer, Thomas W. II
• Primary Examiner(s): Larkin, Daniel S.
• Assistant Examiner(s): FRANK, RODNEY T
• Application Number:
  US10/960,404
• Publication Number:
  US 20060075813A1
• Time in Patent Office: 726 Days
• Field of Search: 731/522.6, 731/520.1, 731/521.8
• US Class Current: 73/152.26
• CPC Class Codes: E21B 49/10 using side-wall fluid samplers or testers

Abstract

An apparatus and method for drawing fluid from a subterranean formation into a downhole tool positioned in a wellbore penetrating the formation is provided. A probe body is extended from the downhole tool for engagement with the wellbore wall. The probe body has at least one inlet extending therethrough for receiving downhole fluids. At least one packer is positioned on an external end of the probe body and adapted to create a seal with the wellbore wall. The packer has an inner surface defining an aperture therethrough in fluid communication with the at least one inlet, and a peripheral surface. An internal packer support is positioned adjacent the inner surface of the packer, and an external packer support is positioned about the peripheral surface of the packer whereby at least a portion of the at least one packer is supported as it is pressed against the wellbore wall.

Claims

1. A probe for drawing fluid from a subterranean formation into a downhole tool, the downhole tool positioned in a wellbore penetrating the subterranean formation, comprising:

a probe body extendable from the downhole tool, the probe body having at least one inlet extending therethrough for receiving downhole fluids;

at least one packer positioned on an external end of the probe body, the at least one packer adapted to create a seal with the wellbore wall, the at least one packer having an inner surface and a peripheral surface, the inner surface defining an aperture therethrough in fluid communication with the at least one inlet; and

a plurality of packer supports, at least one of the plurality of packer supports is an internal packer support positioned adjacent at least a portion of the inner surface of the at least one packer and at least one of the plurality of packer supports is an external packer support positioned about at least a portion of the peripheral surface of the at least one packer whereby at least a portion of the at least one packer is supported as it is pressed against the wellbore wall.

2. The probe af claim 1 further comprising a piston slidably positioned in a chamber of the probe body and extending into the inlet.

3. The probe of claim 2 wherein the piston is selectively retractable within the probe body to define a cavity for receiving a fluid through the inlet.

4. The probe of claim 3 further comprising a sensor for measuring parameters of the fluid.

5. The probe of claim 2 where in the piston has a passage therethrough positionable in fluid communication with a flowline of the downhole tool.

6. The probe of claim 2 wherein the piston is extendable beyond an outer surface of the packer.

7. The probe of claim 2 wherein the internal packer support is a hollow tube, the piston slidably movable therethrough.

8. The probe of claim 1 wherein the internal packer support has a plurality of barbs adapted to engage the inner surface of the packer.

9. The probe of claim 1 wherein the external support is operatively connected to the probe body.

10. The probe of claim 1 wherein at least one of the plurality of supports is selectively extendable.

11. The probe of claim 1 wherein the at least one packer comprises a central packer and a surrounding packer, the central packer disposed within the aperture of the surrounding packer such fluid flowing through the aperture of the central packer is isolated from fluid passing through the aperture of the surrounding packer.

12. A downhole tool for drawing fluid from a subterranean formation therein, the downhole tool positionable in a wellbore penetrating the subterranean formation, comprising:

a housing;

a probe body extendable from the housing, the probe body having at least one inlet extending therethrough for receiving downhole fluids;

at least one packer positioned on an external end of the probe body, the at least one packer adapted to create a seal with the wellbore wall, the at least one packer having an inner surface and a peripheral surface, the inner surface defining an aperture therethrough in fluid communication with the at least one inlet; and

a plurality of packer supports, at least one of the plurality of packer supports is an internal packer support positioned adjacent at least a portion of the inner surface of the at least one packer and at least one of the plurality of packer supports is an external packer support positioned about at least a portion of the peripheral surface of the at least one packer whereby at least a portion of the at least one packer is supponed as it is pressed against the wellbore wall.

13. The downhole tool of claim 12 further comprising a piston slidably positioned in a chamber of the probe body and extending into the inlet.

14. The downhole tool of claim 13 wherein the piston is selectively retractable within the probe body to define a cavity for receiving a fluid through the inlet.

15. The dowuhole tool of claim 14 further comprising a sensor for measuring parameters of the fluid.

16. The downhole tool of claim 13 wherein the piston has a passage therethrough positionable in fluid communication with a flowline in the housing.

17. The downhole tool of claim 13 wherein the piston is extendable beyond an outer surface of the packer.

18. The downhole tool of claim 13 wherein the internal packer support is a hollow tube, the piston slidably movable therethrough.

19. The downhole tool of claim 12 wherein the internal packer support has a plurality of barbs adapted to engage the inner surface of the packer.

20. The downhole tool of claim 12 wherein the external support is operatively connected to the probe body.

22. The downhole tool of claim 12 wherein at least one of the plurality of supports is selectively extendable.

23. The downhole tool of claim 12 wherein the at least one packer comprises a central packer and a surrounding packer, the central packer disposed within the aperture of the surrounding packer such fluid flowing through the aperture of the central packer is isolated from fluid passing through the aperture of the surrounding packer.

24. The downhole tool of claim 12 wherein the downhole tool is one of a drilling tool, a wireline tool, and a coiled tubing tool.

25. The downhole tool of claim 12 wherein the housing is one of a drill collar, a stabilizer blade, a rib, a module and combinations thereof.

21. The downhole tool of claim wherein the external support is operatively connected to the housing.

26. A method of drawing a fluid from a subterranean formation into a downhole tool positioned in a wellbore, the method comprising:

extending a probe from the downhole tool, the probe having at least one packer at an end thereof, the at least one packer having an inner surface and a peripheral surface, the inner surface defining an aperture therethrough;

sealingly engaging the at least one packer with a wall of the wellbore;

supporting at least a portion of the inner surface of the packer and the peripheral surface of the at least one packer with a packer support as the at least one packer engages the wellbore wall; and

drawing the fluid into the probe through the aperture.

27. The method of claim 26 further comprising measuring parameters of the fluid.

28. The method of claim 26 wherein the fluid is drawn into the probe by retracting a piston positioned in the probe.

29. The method of claim 26 further comprising extending a piston positioned in the probe through the wellbore wall.

30. The method of claim 26 wherein the step of supporting comprises grippingly engaging at least a portion of the inner surface of the at least one packer and the peripheral surface of the at least one packer as the packer engages the wellbore wall.