Downhole formation testing tool
Embodiments of the invention relate to a wireline assembly that includes a coring tool for taking coring samples of the formation and a formation testing tool for taking fluid samples from the formation, where the formation testing tool is operatively connected to the coring tool. In some embodiments, the wireline assembly includes a low-power coring tool. In other embodiments, the coring tool includes a flowline for formation testing.
1. A wireline assembly, comprising:
a housing;
a coring tool for taking coring samples of the formation, wherein the coring tool is disposed in the housing and includes a coring bit extendable from the housing; and
a formation testing tool for taking fluid samples from the formation,
wherein the formation resting tool is operatively connected to the coring tool.
2. The wireline assembly of claim 1 , wherein the coring tool comprises:
a first brushless DC motor;
a hydraulic pump coupled to the first brushless DC motor; and
a coring motor hydraulically coupled to the first hydraulic pump.
3. The wireline assembly of claim 2 , there in the coring tool further comprises:
a second brushless DC motor;
a second hydraulic pump operatively coupled to the second brushless DC motor; and
a kinematics piston in fluid communication with the second hydraulic pump.
4. The wireline assembly of claim 3 , wherein the coring tool further comprises a pulse-width modulated solenoid valve in fluid communication with the second hydraulic pump.
5. The wireline assembly of claim 1 , wherein the coring tool consumes less than about 2 kW of power.
6. The wireline assembly of claim 1 , wherein the coring tool consumes less than about 1 kW of power.
7. The wireline assembly of claim 1 , wherein the coring tool further comprises a sample chamber and a first flowline, wherein the first flowline is in fluid communication with a flowline in the formation testing tool and with the sample chamber, and wherein the sample chamber is configured to receive core samples from a coring bit disposed in the coring tool.
8. The wireline assembly of claim 1 , wherein the coring tool and the formation testing tool are connected by a field joint.
9. The wireline assembly of claim 8 , wherein the formation testing tool comprises one selected from the group consisting of an upper module and a lower module, and the coring tool comprises the other of the group consisting of the upper module and the lower module, and wherein the tool joint comprises:
a bottom field joint connector at a lower end of the upper module; and
a top field joint connector at an upper end of the lower module,
wherein the upper module comprises:
a cylindrical housing for receiving the lower module;
a first flowline; and
a female socket bulkhead having at least one female socket, and
wherein the lower module comprises:
a second flowline;
a male pin bulkhead; and
one or more male pins disposed in the male pin bulkhead so that at least a portion of the one or more male pins protrudes upwardly from the male pin bulkhead.
10. The wireline assembly of claim 9 , wherein the formation testing tool comprises the upper module.
11. The wireline assembly of claim 9 , wherein the formation testing tool comprises the lower module.
12. The wireline assembly of claim 9 , wherein the male pin bulkhead is moveable with respect to the lower module, and wherein the lower module further comprises a spring disposed below the male pin bulkhead so as to exert an upward force on the male pin bulkhead.
13. The wireline assembly of claim 1 , wherein the lower module further comprises a protective sleeve disposed around the male pin bulkhead.
14. The wireline assembly of claim 13 , wherein the protective sleeve is porous.
15. The wireline assembly of claim 13 , wherein the protective sleeve is perforated.
16. The wireline assembly of claim 1 , further including a motor operatively coupled to the coring bit to rotate the coring bit.
17. A method for evaluating a formation, comprising:
lowering a wireline assembly into a borehole;
activating a formation testing tool connected in the wireline assembly to obtain a sample fluid from the formation;
activating a coring tool connected in the wireline assembly; and
extending a coring bit of the coring tool from the wireline assembly into a formation to obtain a core sample.
18. The method of claim 17 , further comprising:
directing the core sample into a sample chamber disposed in the wireline assembly; and
directing the fluid sample into the sample chamber.
19. The method of claim 17 , further comprising:
retrieving the wireline assembly;
analyzing the core sample; and
analyzing the fluid sample.
20. The method of claim 16 , further including rotating the coring bit with a motor operatively coupled to the coring bit.
21. A downhole tool, comprising:
a tool body having an opening therein;
a coring bit disposed proximate the opening in the tool body and selectively extendable therethrough; and
a flowline disposed proximate the coring bit; and
a sealing surface disposed proximate a distal end of the flowline.
22. The downhole tool of claim 21 , further comprising a sample block disposed proximate the opening in the tool body, wherein the coring bit is disposed on a first side of the sample block and the sealing surface is disposed on a second side of the sample block.
23. The downhole tool of claim 22 , wherein the sample block is rotatably coupled to the tool.
24. The dowohole tool of claim 22 , wherein the first flowline is disposed in the sample block and further comprising:
a second flowline; and
a tubing connected between the first flowline and the tool flowline.
25. The dowuhole tool of claim 24 , wherein the tubing comprises a flexible tubing.
26. The dowahole tool of claim 24 , wherein the tubing comprises a telescoping tubing.
27. The downhole tool of claim 21 , wherein the sealing surface comprises a packer seal, the coring bit is extendable through an interior of a sealing area of the packer seal; and the distal end of the flowline is disposed inside the sealing area of the packer seal and operatively coupled to a fluid pump.
28. The dowohole tool of claim 21 , further comprising a sample chamber.
29. The downhole tool of claim 28 , wherein the sample chamber is segmented by one or more valves.
30. The downhole tool of claim 29 , wherein the one or more valves are gate valves.
31. The downhole tool of claim 29 , wherein the one or more valves are iris valves.
32. The downhole tool of claim 28 , further comprising a fill line connected to the sample chamber and connected to flowline.
33. The downhole tool of claim 32 , further comprising a fill valve disposed in the fill line selectively positionable to put the sample chamber in fluid communication with the flowline.
34. A field joint for connecting tool modules, comprising:
an upper module having a bottom field joint connector at a lower end of the upper module; and
a lower module having a top field joint connector at an upper end of the lower module,
wherein the upper module comprises:
a cylindrical housing far receiving the lower module;
a first flowline; and
a female socket bulkhead having at least one female socket, and
wherein the lower module comprises:
a second flowline;
a male pin bulkhead; and
one or more male pins disposed in the male pin bulkhead so that at least a portion of the one or more male pins protrudes upwardly from the male pin bulkhead.
35. The field joint of claim 34 , wherein the lower module further comprises a protective sleeve disposed around the male pin bulkhead.
36. The field joint of claim 35 , wherein the protective sleeve is porous.
37. The field joint of claim 35 , wherein the protective sleeve is perforated.
38. The field joint of claim 34 , wherein the male pin bulkhead is moveable with respect to the lower module, and wherein the lower module further comprises a spring disposed below the male pin bulkhead so as to exert an upward force on the male pin bulkhead.
39. A method for taking downhole samples, comprising:
obtaining a core sample using a caring bit disposed on a sample block in a downhole tool;
rotating the sample block;
establishing fluid communication between a flowline in the sample block and a formation; and
withdrawing a formation fluid from the formation through the flowline.
40. The method of claim 39 , wherein the establishing fluid communication between the flowline in the sample block and a formation comprises extending the sample block so that a packer disposed on the sample block is in contact with the formation.
41. The method of claim 40 , further comprising: ejecting the core from the coring bit into a sample chamber; and direction the formation fluid to the sample chamber.
42. A method for taking downhole samples, comprising:
establishing fluid communication between a flowline in a downhole tool and a formation by extending the a packer seal to be in contact with a formation;
obtaining a core sample using a coring bit configured to extend inside a sealing area of the packer seal;
ejecting the core from the coring bit and into a sample chamber; and
withdrawing a formation fluid from the formation through the flowline.
43. The method of claim 42 , further comprising directing the formation fluid to the sample chamber.