Pumping device for taking liquid in reciprocating mode in well drilling process

Abstract

The utility model discloses a pumping device for extracting liquid in a reciprocating mode in the well drilling process, which comprises a cylinder body, and the cylinder body is provided with a first end and a second end which are opposite. The first end is provided with a sampling assembly, and the second end is provided with a sample collection switching assembly; a piston assembly is arranged in the cylinder body and divides the interior of the cylinder body into a first cavity, a second cavity, a third cavity and a fourth cavity. The sampling assembly is provided with a sampling channel communicated with the first cavity, and a first one-way valve is arranged in the sampling channel; the cylinder body is provided with a connecting channel communicating with the first cavity and the fourth cavity, and a second one-way valve is arranged in the connecting channel. The sample collection switching assembly is provided with a sample collection channel, and a third one-way valve is arranged in the sample collection channel; and the second cavity and the third cavity are respectively connected to a driving device through high-pressure pipelines. According to the pumping device, various samples can be obtained through one-time well descending, the sampling effect is good, and the sampling efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling, in particular to a pumping device for reciprocating liquid extraction during the drilling process. Background Art

[0002] The drilling mid-course oil and gas formation tester (EFDT) is used to measure formation pressure and sample undisturbed fluid in the formation. An analysis of the applicability of conventional probes of the drilling mid-course oil and gas formation tester in Bohai Sea area found that there are many types of samples, which increases the difficulty of sampling. Therefore, a pumping device for reciprocating liquid extraction during drilling is designed to obtain multiple samples in one trip and improve the convenience of sampling. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a pumping device for reciprocating liquid extraction during drilling, which can achieve multiple samples in one trip down the well, has good sampling effect, and greatly improves sampling efficiency.

[0004] The utility model provides a pumping device for reciprocating liquid extraction during drilling, comprising a cylinder body, the cylinder body having a first end and a second end opposite to each other; the first end is provided with a sampling assembly, the second end is provided with a sample collection adapter assembly; a piston assembly is provided in the cylinder body, and the piston assembly divides the cylinder body into a first cavity, a second cavity, a third cavity and a fourth cavity along the direction from the first end to the second end;

[0005] The sampling assembly is provided with a sampling channel connected to the first cavity, and a first one-way valve is provided in the sampling channel; the cylinder body is provided with a connecting channel connecting the first cavity and the fourth cavity, and a second one-way valve is provided in the connecting channel; the sample collecting adapter assembly is provided with a sample collecting channel connected to the fourth cavity, and a third one-way valve is provided in the sample collecting channel; the second cavity and the third cavity are respectively connected to the driving device through high-pressure pipelines.

[0006] Furthermore, the sampling assembly includes a sampling connector, one end of which is embedded in the first end and fixed in the first end by a first external threaded locking ring, and a first sealing ring is arranged between the sampling connector and the inner wall of the first end; the sampling channel passes through the sampling connector and is connected to the first cavity.

[0007] Furthermore, a first positioning block is fixedly provided on one side of the sampling connector, a first positioning groove matched with the first positioning block is opened on one side of the first end, and the first positioning block is embedded in the first positioning groove.

[0008] Furthermore, the sample collecting adapter assembly includes a sealing joint, which is fixed in the second end by a second externally threaded locking ring, a second sealing ring is arranged between the sealing joint and the inner wall of the second end, and the second end is fixedly connected with a sample collecting adapter sealingly docked with the sealing joint by screws; the sample collecting channel passes through the sample collecting adapter and the sealing joint and is connected to the fourth cavity.

[0009] Furthermore, a second positioning block is fixedly provided on one side of the sealing joint, a second positioning groove matched with the second positioning block is opened on one side of the second end, and the second positioning block is embedded in the second positioning groove.

[0010] Furthermore, the piston assembly includes a spacer plug fixedly arranged in the middle of the cylinder body, a piston rod is sealingly and slidably sleeved in the spacer plug, a first piston head is arranged at one end of the piston rod close to the first end, and a second piston head is arranged at the other end;

[0011] The first cavity is formed between the first piston head and the sampling assembly; the second cavity is formed between the first piston head and the spacing plug; the third cavity is formed between the second piston head and the spacing plug; and the fourth cavity is formed between the second piston head and the sample collection adapter assembly.

[0012] Furthermore, two circles of third sealing rings are arranged between the spacer plug and the inner wall of the cylinder body; two circles of fourth sealing rings are arranged between the spacer plug and the piston rod; two circles of fifth sealing rings are arranged between the first piston head and the inner wall of the cylinder body; and two circles of sixth sealing rings are arranged between the second piston head and the inner wall of the cylinder body.

[0013] Furthermore, the driving device is a hydraulic pump.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The pumping device of the utility model drives the piston assembly to reciprocate in the cylinder body through the driving device, and can complete the sampling of one liquid every time it reciprocates, and can complete the sampling of multiple liquids in one trip down the well, with good sampling effect, which greatly improves the sampling efficiency.

[0016] It should be understood that the contents described in the utility model summary are not intended to limit the key or important features of the embodiments of the utility model, nor are they intended to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0018] Figure 1 It is a schematic diagram of the structure of the pumping device;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the pumping device;

[0020] Figure 3 It is a schematic diagram of the structure of the sampling component;

[0021] Figure 4 It is a structural schematic diagram of the sample collection and transfer assembly;

[0022] Figure 5 This is the sampling principle block diagram of the pumping device.

[0023] Numbers in the figure: 1, cylinder; 2, sampling assembly; 3, sample collection adapter assembly; 4, piston assembly; 5, first cavity; 6, second cavity; 7, third cavity; 8, fourth cavity;

[0024] 11. first end; 12. second end; 13. connecting channel; 14. second one-way valve; 15. first positioning groove; 16. second positioning groove;

[0025] 21. Sampling channel; 22. First one-way valve; 23. Sampling connector; 24. First external thread lock ring; 25. First sealing ring; 26. First positioning block;

[0026] 31. Sample collection channel; 32. Third one-way valve; 33. Blocking joint; 34. Second external thread lock ring; 35. Second sealing ring; 36. Sample collection adapter; 37. Second positioning block;

[0027] 41. Spacer plug; 42. Piston rod; 43. First piston head; 44. Second piston head; 45. Third sealing ring; 46. Fourth sealing ring; 47. Fifth sealing ring; 48. Sixth sealing ring. DETAILED DESCRIPTION

[0028] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings.

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] Please refer to Figure 1 to Figure 5The embodiment of the utility model provides a pumping device for reciprocating liquid extraction during drilling, comprising a cylinder body 1, the cylinder body 1 having a first end 11 and a second end 12 opposite to each other; a sampling assembly 2 is provided at the first end 11, and a sample collection adapter assembly 3 is provided at the second end 12; a piston assembly 4 is provided in the cylinder body 1, and the piston assembly 4 divides the cylinder body 1 into a first cavity 5, a second cavity 6, a third cavity 7 and a fourth cavity 8 along the direction from the first end 11 to the second end 12;

[0031] The sampling assembly 2 is provided with a sampling channel 21 connected with the first cavity 5, and a first one-way valve 22 is provided in the sampling channel 21; the cylinder body 1 is provided with a connecting channel 13 connecting the first cavity 5 and the fourth cavity 8, and a second one-way valve 14 is provided in the connecting channel 13; the sample collecting adapter assembly 3 is provided with a sample collecting channel 31 connected with the fourth cavity 8, and a third one-way valve 32 is provided in the sample collecting channel 31; the second cavity 6 and the third cavity 7 are respectively connected to the driving device through high-pressure pipelines.

[0032] In this embodiment, the output end of the sample collection adapter assembly 3 is connected to the container switching device. When sampling, after the cylinder body 1 is extended to the sampling position in the well, the driving device drives the piston assembly 4 to move toward the second end 12, and the liquid enters the first cavity 5 through the first one-way valve 22 and the sampling channel 21; then the driving device drives the piston assembly 4 to move toward the first end 11, and the liquid in the first cavity 5 enters the fourth cavity 8 through the connecting channel 13 and the second one-way valve 14.

[0033] Then the cylinder 1 moves to the next sampling position, the driving device drives the piston assembly 4 to move toward the second end 12, and the second liquid enters the first cavity 5 through the first one-way valve 22 and the sampling channel 21; at the same time, the first liquid in the fourth cavity 8 enters the collection container through the sample collection channel 31 and the third one-way valve 32, completing the collection of the first liquid. Then the container switching device switches a new collection container to be connected to the sample collection adapter assembly 3, and the driving device drives the piston assembly 4 to move toward the first end 11, and the second liquid in the first cavity 5 enters the fourth cavity 8 through the connecting channel 13 and the second one-way valve 14.

[0034] According to the above steps, each time the cylinder body 1 moves to a sampling position, the piston assembly 4 reciprocates once in the cylinder body 1 to complete the sampling of one liquid, thereby achieving the sampling of multiple liquids in one trip down the well, with good sampling effect and greatly improving the sampling efficiency.

[0035] In a preferred embodiment, if Figure 2 and Figure 3As shown, the sampling assembly 2 includes a sampling connector 23, one end of which is embedded in the first end 11 and fixed in the first end 11 by a first external threaded locking ring 24, and a first sealing ring 25 is arranged between the sampling connector 23 and the inner wall of the first end 11; the sampling channel 21 passes through the sampling connector 23 and is connected to the first cavity 5.

[0036] In this embodiment, the first end 11 of the cylinder body 1 is blocked by a sampling connector 23, and a first one-way valve 22 is arranged in a sampling channel 21 passing through the sampling connector 23, so that the external liquid and the first cavity 5 can only enter but not exit, thereby ensuring that the pumping device can sample different liquids separately and the sampling effect is good.

[0037] In a preferred embodiment, if Figure 1 and Figure 3 As shown, a first positioning block 26 is fixedly provided on one side of the sampling connector 23, a first positioning groove 15 adapted to the first positioning block 26 is opened on one side of the first end 11, and the first positioning block 26 is embedded in the first positioning groove 15 to ensure accurate installation of the sampling connector 23.

[0038] In a preferred embodiment, if Figure 2 and Figure 4 As shown, the sample collecting adapter assembly 3 includes a sealing joint 33, which is fixed in the second end 12 by a second externally threaded locking ring 34, a second sealing ring 35 is arranged between the sealing joint 33 and the inner wall of the second end 12, and the second end 12 is fixedly connected with a sample collecting adapter 36 sealingly docked with the sealing joint 33 by screws; the sample collecting channel 31 passes through the sample collecting adapter 36 and the sealing joint 33 and is connected to the fourth cavity 8.

[0039] In this embodiment, the sample collecting adapter 36 is connected to the container switching device, the second end 12 of the cylinder body 1 is blocked by the blocking joint 33, and a second one-way valve 32 is arranged in the sample collecting channel 31 passing through the sample collecting adapter 36 and the blocking joint 33, so that the fourth cavity 8 and the collection container can only exit but not enter, ensuring that different liquids are injected into different collection containers respectively, and the sampling effect is good.

[0040] In a preferred embodiment, if Figure 1 and Figure 4 As shown, a second positioning block 37 is fixedly provided on one side of the sealing joint 33, and a second positioning groove 16 adapted to the second positioning block 37 is opened on one side of the second end 12. The second positioning block 37 is embedded in the second positioning groove 16 to ensure the accurate installation of the sealing joint 33.

[0041] In a preferred embodiment, if Figure 1As shown, the piston assembly 4 includes a spacer plug 41 fixedly arranged in the middle of the cylinder body 1, a piston rod 42 is sealingly and slidably sleeved in the spacer plug 41, a first piston head 43 is arranged at one end of the piston rod 42 close to the first end 11, and a second piston head 44 is arranged at the other end;

[0042] A first cavity 5 is formed between the first piston head 43 and the sampling assembly 2 ; a second cavity 6 is formed between the first piston head 43 and the spacing plug 41 ; a third cavity 7 is formed between the second piston head 44 and the spacing plug 41 ; and a fourth cavity 8 is formed between the second piston head 44 and the sample collection adapter assembly 3 .

[0043] In this embodiment, when performing sampling operation, the driving device injects the driving medium into the second cavity 6, and the driving medium in the third cavity 7 flows back to the driving device; or the driving device injects the driving medium into the third cavity 7, and the driving medium in the second cavity 6 flows back to the driving device; the driving of the first piston head 43 and the second piston head 44 is realized by alternately injecting and returning the driving medium in the second cavity 6 and the third cavity 7, thereby cooperating with the first cavity 5 and the fourth cavity 8 to complete the sampling, and the sampling effect is good.

[0044] In a preferred embodiment, if Figure 2 As shown, two circles of third sealing rings 45 are arranged between the spacer plug 41 and the inner wall of the cylinder body 1; two circles of fourth sealing rings 46 are arranged between the spacer plug 41 and the piston rod 42; two circles of fifth sealing rings 47 are arranged between the first piston head 43 and the inner wall of the cylinder body 1; two circles of sixth sealing rings 48 are arranged between the second piston head 44 and the inner wall of the cylinder body 1, thereby ensuring the sealing effect of the spacer plug 41, the first piston head 43 and the second piston head 44.

[0045] In a preferred embodiment, the driving device is a hydraulic pump, which has a good driving effect.

[0046] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the description of this specification, the description of the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pumping device for reciprocating liquid extraction during drilling, characterized in that: The invention comprises a cylinder (1), wherein the cylinder (1) has a first end (11) and a second end (12) opposite to each other; the first end (11) is provided with a sampling assembly (2), and the second end (12) is provided with a sample collection adapter assembly (3); a piston assembly (4) is provided in the cylinder (1), and the piston assembly (4) divides the cylinder (1) into a first cavity (5), a second cavity (6), a third cavity (7) and a fourth cavity (8) along the direction from the first end (11) to the second end (12); The sampling assembly (2) is provided with a sampling channel (21) connected to the first cavity (5), and a first one-way valve (22) is provided in the sampling channel (21); the cylinder body (1) is provided with a connecting channel (13) connecting the first cavity (5) and the fourth cavity (8), and a second one-way valve (14) is provided in the connecting channel (13); the sample collecting adapter assembly (3) is provided with a sample collecting channel (31) connected to the fourth cavity (8), and a third one-way valve (32) is provided in the sample collecting channel (31); the second cavity (6) and the third cavity (7) are respectively connected to the driving device through high-pressure pipelines.

2. The pumping device for reciprocating liquid extraction during drilling according to claim 1, characterized in that: The sampling assembly (2) comprises a sampling connector (23), one end of which is embedded in the first end (11) and fixed in the first end (11) by a first external threaded locking ring (24); a first sealing ring (25) is provided between the sampling connector (23) and the inner wall of the first end (11); the sampling channel (21) passes through the sampling connector (23) and is connected to the first cavity (5).

3. The pumping device for reciprocating liquid extraction during drilling according to claim 2, characterized in that: A first positioning block (26) is fixedly provided on one side of the sampling connector (23), a first positioning groove (15) adapted to the first positioning block (26) is provided on one side of the first end (11), and the first positioning block (26) is embedded in the first positioning groove (15).

4. The pumping device for reciprocating liquid extraction during drilling according to claim 1, characterized in that: The sample collecting adapter assembly (3) comprises a plugging joint (33), the plugging joint (33) is fixed in the second end (12) by a second external threaded locking ring (34), a second sealing ring (35) is arranged between the plugging joint (33) and the inner wall of the second end (12), and the second end (12) is fixedly connected to a sample collecting adapter (36) which is sealingly connected to the plugging joint (33) by screws; the sample collecting channel (31) passes through the sample collecting adapter (36) and the plugging joint (33) and is connected to the fourth cavity (8).

5. The pumping device for reciprocating liquid extraction during drilling according to claim 4, characterized in that: A second positioning block (37) is fixedly provided on one side of the sealing joint (33), a second positioning groove (16) adapted to the second positioning block (37) is provided on one side of the second end (12), and the second positioning block (37) is embedded in the second positioning groove (16).

6. The pumping device for reciprocating liquid extraction during drilling according to claim 1, characterized in that: The piston assembly (4) comprises a spacer plug (41) fixedly arranged in the middle of the cylinder body (1), a piston rod (42) being sealingly and slidably sleeved in the spacer plug (41), a first piston head (43) being arranged at one end of the piston rod (42) close to the first end (11), and a second piston head (44) being arranged at the other end; The first cavity (5) is formed between the first piston head (43) and the sampling assembly (2); the second cavity (6) is formed between the first piston head (43) and the spacer plug (41); the third cavity (7) is formed between the second piston head (44) and the spacer plug (41); and the fourth cavity (8) is formed between the second piston head (44) and the sample collection adapter assembly (3).

7. The pumping device for reciprocating liquid extraction during drilling according to claim 6, characterized in that: Two circles of third sealing rings (45) are arranged between the spacer plug (41) and the inner wall of the cylinder body (1); two circles of fourth sealing rings (46) are arranged between the spacer plug (41) and the piston rod (42); two circles of fifth sealing rings (47) are arranged between the first piston head (43) and the inner wall of the cylinder body (1); and two circles of sixth sealing rings (48) are arranged between the second piston head (44) and the inner wall of the cylinder body (1).

8. The pumping device for reciprocating liquid extraction during drilling according to claim 1, characterized in that: The driving device is a hydraulic pump.

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