Method and apparatus for continuously testing a well

• US 6,457,521 B1
• Filed: 01/08/2002
• Issued: 10/01/2002
• Est. Priority Date: 04/22/1999
• Status: Expired due to Term

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: Patel, Dinesh R., Spiers, Christopher W., Langseth, Bjorn
• Primary Examiner(s): Tsay, Frank
• Application Number:
  US10/041,917
• Publication Number:
  US 20020066563A1
• Time in Patent Office: 266 Days
• Field of Search: 166/250.01, 166/250.03, 166/264, 166/72, 166/373, 166/374, 166/100, 166/321
• US Class Current: 166/264
• CPC Class Codes: E21B 49/08 Obtaining fluid samples or testing fluids, in boreholes or wells
• CPC Class Codes: E21B 49/081 with down-hole means for trapping a fluid sample E21B49/10 takes precedence
• CPC Class Codes: E21B 49/088 combined with sampling

Abstract

One embodiment of my invention comprises a tool string for testing a wellbore formation that includes a production inlet, an injection outlet, and a sampler apparatus. Fluid is taken from a production zone, into the tool string through the production inlet, out of the tool string through the injection outlet, and into the injection zone. Within the interior of the tool string, the sampler apparatus takes samples of the fluid flowing therethrough. In another embodiment, a large volume of sample fluid is trapped within the interior of the tool string, such as between two valves, and is removed from the wellbore along with the tool string subsequent to the test. In another embodiment, the tool string includes at least one perforating gun to perforate one of the production and injection zones. The tool string may also include two perforating guns to perforate both the production and injection zones. One of the two perforating guns may be an oriented perforating gun so that upon activation the shape charges do not disturb any of the cables, data lines, or transmission lines associated with the tool string.

Claims

1. A device for removing a dead fluid from a downhole tool string, the tool string including a compartment, comprising:

a valve assembly including a piston, a conduit, and a passage;

the conduit in fluid communication with the dead fluid in the compartment;

the conduit disposed through the piston;

the piston slidingly disposed within the compartment; and

the passage in fluid communication with the compartment.

2. The device of claim 1, wherein the passage is in fluid communication with the interior of the valve assembly.

3. The device of claim 1, wherein the passage provides fluid communication between a pressure source and the compartment.

4. The device of claim 3, wherein pressurized fluid from the pressure source causes the piston to slide within the compartment towards the dead fluid forcing the dead fluid into the conduit.

5. The device of claim 4, wherein:

the piston is slidably disposed on the conduit; and

the pressurized fluid causes the piston to slide on the conduit within the compartment towards the dead fluid forcing the dead fluid into the conduit.

6. The device of claim 1, wherein the conduit provides fluid communication between the compartment and at least one container.

7. The device of claim 1, wherein the conduit is in fluid communication with a pressure source.

8. The device of claim 1, wherein the passage provides fluid communication between at least one container and the compartment.

9. The device of claim 1, wherein the piston includes at least one selectively closable fluid communication port therethrough.

10. The device of claim 9, wherein the ports of the piston are initially open and the piston is moved within the compartment so that a majority of the dead fluid is intermediate the piston and the passage.

11. The device of claim 10, wherein the ports of the piston are closed when the piston reaches the location wherein a majority of the dead fluid is intermediate the piston and the passage.

12. The device of claim 11, wherein:

the conduit is in fluid communication with a pressure source; and

pressurized fluid from the pressure source causes the piston to slide within the compartment towards the passage forcing the dead fluid through the passage.

13. The device of claim 1, wherein:

the valve assembly further comprises a stuffing box; and

the conduit is sealingly disposed through the stuffing box.

14. The device of claim 13, wherein the conduit is slidingly disposed through the stuffing box.

15. A device for removing a dead fluid from a downhole tool string, the tool string including a compartment, comprising:

a valve assembly including a conduit and a passage;

the conduit in fluid communication with the dead fluid in the compartment;

the conduit movably disposed within the compartment; and

the passage in fluid communication with the compartment.

16. The device of claim 15, wherein the passage provides fluid communication between the compartment and a pressure source.

17. The device of claim 16, wherein pressurized fluid from the pressure source forces the dead fluid into the conduit.

18. The device of claim 15, wherein the conduit provides fluid communication between the compartment and a pressure source.

19. The device of claim 18, wherein pressurized fluid from the pressure source forces the dead fluid into the passage.

20. The device of claim 15, wherein:

the valve assembly further comprises a stuffing box; and

the conduit is sealingly disposed through the stuffing box.

21. The device of claim 20, wherein the conduit is slidingly disposed through the stuffing box.

22. A method for removing a fluid from a downhole tool string, the tool string including a compartment, the method comprising:

attaching a valve assembly to the tool string, the valve assembly including a piston and a conduit, the conduit disposed through the piston; and

sliding the piston within the compartment towards the fluid thereby forcing the fluid to pass into the conduit.

23. The method of claim 22, wherein:

the valve assembly further includes a passage providing fluid communication between a pressure source and the compartment; and

wherein the sliding step comprises injecting pressurized fluid through the passage which causes the piston to slide within the compartment towards the fluid.

24. The method of claim 23, wherein:

the piston is slidably disposed on the conduit; and

the pressurized fluid causes the piston to slide on the conduit within the compartment towards the fluid.

25. A method for removing a fluid from a downhole tool string, the tool string including a compartment, the method comprising:

attaching a valve assembly to the tool string, the valve assembly including a piston and a passage;

positioning the piston so that a majority of the fluid is intermediate the piston and the passage; and

sliding the piston towards the passage thereby forcing the fluid to pass into the passage.

26. The method of claim 25, wherein the piston includes at least one selectively closable fluid communication port therethrough.

27. The method of claim 26, wherein prior to the sliding step the ports of the piston are initially open and the piston is moved within the compartment so that a majority of the fluid is intermediate the piston and the passage.

28. The method of claim 27, wherein the ports of the piston are closed when the piston reaches the location wherein a majority of the fluid is intermediate the piston and the passage.

29. The method of claim 28, wherein:

the valve assembly further includes a conduit providing fluid communication between a pressure source and the compartment; and

wherein the sliding step comprises injecting pressurized fluid through the conduit which causes the piston to slide within the compartment towards the passage.

30. The method of claim 25, wherein:

the valve assembly further includes a conduit providing fluid communication between a pressure source and the compartment; and

wherein the sliding step comprises injecting pressurized fluid through the conduit which causes the piston to slide within the compartment towards the passage.

31. A method for removing a fluid from a downhole tool string, the tool string including a compartment, the method comprising:

attaching a valve assembly to the tool string, the valve assembly including a conduit and a passage; and

injecting a pressurized fluid through the conduit wherein the pressurized fluid forces the dead fluid out of the compartment through the passage.

32. A method for removing a fluid from a downhole tool string, the tool string including a compartment, the method comprising:

attaching a valve assembly to the tool string;

the valve assembly including a conduit and a passage; and

injecting a pressurized fluid through the passage wherein the pressurized fluid forces the dead fluid out of the compartment through the conduit.