Three-stage cylinder precision fluid suction structure

Abstract

The present application provides a kind of tertiary cylinder precision fluid pumping structure, including shell and power part installed in shell, and drive part, the drive part includes the screw rod device that converts circular motion into linear motion, provides hydraulic power to external instrument oil pressure device, and extraction device of extracting underground liquid sample.The present application increases secondary piston sleeve, and forms a sealed hydraulic oil cavity in shell, so that secondary piston sleeve can drive hydraulic oil in oil cavity to output high pressure hydraulic oil to the outside, provide hydraulic power for the instrument needed, the instrument here can be measuring equipment, can also be push arm.This embodiment makes full use of existing screw rod structure, without affecting the original equipment liquid sampling, while providing more power options for other instruments.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of downhole oil measurement, in particular to a three-stage cylinder precision fluid pumping structure capable of providing hydraulic power for downhole measuring instruments while sampling. BACKGROUND

[0002] With the development of the oil industry, oil exploration and exploitation technology is constantly updated, and formation sampling instruments have always been an important part of exploration equipment in the field of oil exploration, which can be used to measure various data of the current drilling, such as inclination, liquid sampling, etc.

[0003] The existing pusher itself needs corresponding high-pressure hydraulic oil to drive the work, such as the extension of the pusher's push arm, and some measuring instruments installed on the pusher also need corresponding high-pressure hydraulic oil to provide power, such as the sample cylinder for placing underground mud.

[0004] In the patent application 202210022910.4, a multi-pump integrated mixed fluid delivery device is disclosed, which outputs multiple powers by multiple pumps working simultaneously to meet the requirement of providing power for multiple instruments simultaneously. However, in this patent, the sampling part can only sample and cannot provide additional hydraulic power, resulting in a large waste of space. In addition, the shell is connected by multiple short pipes through threads, which is not conducive to the disassembly of the middle part, and all the connections are threaded, which will rotate the threads of the connection part when connecting each section, affecting the docking effect. SUMMARY

[0005] An object of the present application is to provide a three-stage cylinder precision fluid pumping structure capable of providing hydraulic power for downhole measuring instruments while sampling.

[0006] Another object of the present application is to provide a shell connection structure, which makes the installation and disassembly of each part of the whole shell more convenient.

[0007] Specifically, the present application provides a three-stage cylinder precision fluid pumping structure, comprising a hollow cylindrical shell, a power part installed in the shell for providing power to the outside through a plunger pump, and

[0008] a drive part comprising a lead screw device for converting circular motion to linear motion, an oil pressure device for providing hydraulic power to the external instrument, and a sampling device for sampling underground liquid samples;

[0009] The screw rod device comprises a screw rod connected to the power unit at one end, a screw rod nut screwed on the outer surface of the screw rod, and a first piston sleeve sleeved on the outer surface of the screw rod nut and the screw rod, the first piston sleeve comprising a nut segment sleeved on the outer surface of the screw rod nut and a screw rod segment sleeved on the outer surface of the screw rod, the outer surface of the nut segment being in contact with the inner surface of the shell; an outwardly protruding sliding block is arranged on the outer surface of the nut segment, and an axial sliding groove accommodating the sliding block is arranged on the inner surface of the shell.

[0010] The oil pressure device comprises a second piston sleeve threadedly connected to the other end of the first piston sleeve, the threadedly connected end of the second piston sleeve being in contact with the inner surface of the shell, and a first isolation sleeve and a second isolation sleeve are respectively arranged on the first piston sleeve and the second piston sleeve to isolate the liquid flow in the adjacent spaces;

[0011] The extraction device comprises a piston head arranged at the other end of the second piston sleeve, the outer surface of the piston head being in contact with the inner surface of the shell.

[0012] The present application adds a second piston sleeve and forms a sealed hydraulic oil cavity in the shell, so that the second piston sleeve can drive the hydraulic oil in the oil cavity to output high-pressure hydraulic oil to the outside, thereby providing hydraulic power for the required instruments, which can be measuring devices or push arms. The present embodiment makes full use of the existing screw rod structure, which does not affect the liquid sampling of the original device, and at the same time provides more power options for other instruments. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic view of the three-stage cylinder structure of the present application;

[0014] Figure 2 is an exploded view of the three-stage cylinder;

[0015] Figure 3 is a schematic view of the installation of the first piston sleeve;

[0016] Figure 4 is Figure 1 A-A sectional view in

[0017] Figure 5 is Figure 1 B-B sectional view in DETAILED DESCRIPTION

[0018] The specific structure and implementation process of the present application will be described in detail below through specific examples and drawings. The present application is a functional module of a downhole measuring instrument, and the "main base body" mentioned herein refers to the body of the measuring instrument. "Left" refers to the left side of the drawing when facing the screen, and "right" refers to the right side of the drawing when facing the screen; "external environment" refers to the external environment of the downhole measuring position.

[0019] The present application is an improvement on the 202210022910.4 patent, therefore, the improvement part of the present scheme is not involved in the improvement of the pusher, such as the structure and working mode of the power drive part, oil pressure drive part, etc. can refer to 202210022910.4 patent.

[0020] The following only describes the improvement points involved in the present scheme in detail. As shown in the figure, Figure 1 In one embodiment of the present application, a three-stage cylinder precision fluid pumping structure is disclosed, which comprises a hollow cylindrical shell 1, the shell 1 is the protective shell outside the entire measuring instrument, and the inside is used for installing various power components, hydraulic lines, driving devices, measuring devices, etc.

[0021] The driving part involved in the present scheme needs to be connected with the power part installed in the shell to receive the single axial power output by the power part, which specifically includes a lead screw device 2 for converting circular motion into linear motion, an oil pressure device 3 for providing hydraulic power to the external instrument, and a pumping device 4 for pumping underground liquid samples;

[0022] The lead screw device 1 includes a lead screw 21 connected with the power part 5 plunger pump through one end, a lead screw nut 22 screwed on the outer surface of the lead screw 21, and a first-stage piston sleeve 23 sleeved on the outer surface of the lead screw nut 22 and the lead screw 21. The first-stage piston sleeve 23 is divided into a nut segment 231 sleeved on the outer surface of the lead screw nut 22 and a lead screw segment 232 sleeved on the outer surface of the lead screw 21 according to the different sleeve insertion positions, the diameter of the lead screw segment 232 is smaller than that of the nut segment 231, the outer surface of the nut segment 231 is in contact with the inner surface of the shell 1, and cavities 24 are formed on both sides of the nut segment 231. An outward convex sliding block 25 is arranged on the outer surface of the nut segment 231, and an axial sliding groove 26 accommodating the sliding block 25 is arranged on the inner surface of the shell 1.

[0023] The oil pressure device 3 includes a second-stage piston sleeve 31 threadedly connected with the other end (relative to the end away from the power part) of the first-stage piston sleeve 23, the outer surface of the threaded connection end 32 of the second-stage piston sleeve 31 is in contact with the inner surface of the shell 1, and a first-stage isolation sleeve 33 and a second-stage isolation sleeve 34 are respectively installed on the first-stage piston sleeve 23 and the second-stage piston sleeve 31 to isolate the liquid flow in the adjacent space, the relative positions of the first-stage isolation sleeve 33 and the second-stage isolation sleeve 34 are fixed, and the first-stage piston sleeve 23 and the second-stage piston sleeve 31 can slide and move inside the first-stage isolation sleeve 33 and the second-stage isolation sleeve 34.

[0024] The extraction device 4 comprises a piston head 41 mounted at the other end of the secondary piston sleeve 31 (away from the end of the primary piston sleeve 21), the outer surface of the piston head 41 being in sliding contact with the inner surface of the housing 1, and the end of the housing 1 opposite the piston head 41 being sealed and closed by the plug 12. The piston head 41 is fixed by a screw rod 42 passing through the shaft and screwed into the end of the secondary piston sleeve 31.

[0025] The structure and working mode of the foregoing structure will be described in detail below.

[0026] The power unit 5 outputs circumferential power through the plunger pump, drives the screw rod 21 connected to the plunger pump to rotate, and the screw rod 21 rotates circumferentially in the screw nut 22, drives the screw nut 22 to rotate through external threads, and the screw nut 22 drives the primary piston sleeve 23 fixedly connected thereto to rotate. Since the nut section 231 of the primary piston sleeve 23 is provided with the sliding block 25 on the outer surface thereof, the circumferential rotation of the primary piston sleeve 23 is converted into linear motion along the axial sliding groove 26, thereby pushing the connected secondary piston sleeve 31 to also move linearly. In the cavity 24 of the housing 1 where the nut section 231 is located, normal-pressure hydraulic oil is filled, and the normal-pressure hydraulic oil on both sides of the nut section 231 can flow through the axial sliding groove 26, and the normal-pressure hydraulic oil is used to keep the internal pressure of the housing 1 the same as the downhole pressure, thereby protecting the housing 1 from being extruded and deformed. In this embodiment, the top end of the right end of the axial sliding groove 26 is located at the primary isolation sleeve 23.

[0027] The cavity between the primary isolation sleeve 33 and the secondary isolation sleeve 34 forms a sealed hydraulic cavity 35, and the secondary piston sleeve 31 reciprocates in the cavity 35 and separates the cavity 35 into a left oil cavity 351 and a right oil cavity 352. The left oil cavity 351 and the right oil cavity 352 are connected to the external oil supply cavity and the instrument requiring high-pressure hydraulic oil through oil line, and the oil line connecting the left oil cavity 351 and the right oil cavity 352 at least includes an oil inlet line and an oil outlet line; when the secondary piston sleeve 31 reciprocates with the primary piston sleeve 23, the hydraulic oil in the left oil cavity 351 is pushed out as high-pressure oil, and the right oil cavity 352 sucks in normal-pressure hydraulic oil, and the process is reversed when moving in the opposite direction.

[0028] The sample cavity 43 is formed between the secondary isolation sleeve 34 and the end of the shell 1, and the piston head 41 is located in the sample cavity 43 and separates the sample cavity into a left pressing chamber 431 and a right pressing chamber 432. When the secondary piston sleeve 34 moves, the piston head 41 at the other end reciprocates in the sample cavity 43. Since the piston head 41 is in sliding sealing contact with the inner surface of the shell 1, when the piston head 41 moves to the right, the left pressing chamber 431 generates suction and the right pressing chamber 432 generates thrust, and when the piston head 41 moves to the left, the action is reversed. The sample line for sucking external liquid and discharging liquid to the sample cylinder is arranged on the cavity wall of the sample cavity 43. When the right pressing chamber 432 generates thrust, the internal liquid enters the sample cylinder along the sample line, and at this time the suction generated by the left pressing chamber 431 sucks the external liquid into the left pressing chamber 431. When the right pressing chamber 432 generates suction, the external liquid is sucked into the right pressing chamber 432 through the sample line, and at this time the thrust received by the left pressing chamber 431 pushes the internal liquid to the sample cylinder. By repeating the process, the sample cylinder can be filled.

[0029] In the foregoing oil cavity 35 and sample cavity 43, the function of controlling the opening and closing of each pipeline along with the reciprocating movement of the lead screw 21 is realized by a corresponding electromagnetic valve.

[0030] In the present embodiment, a secondary piston sleeve is added, and a sealed hydraulic oil cavity is formed in the shell, so that the secondary piston sleeve can drive the hydraulic oil in the oil cavity to output high-pressure hydraulic oil to the outside, providing hydraulic power for the required instruments. The instruments can be measuring devices or push arms. The present embodiment makes full use of the existing lead screw structure, without affecting the liquid sampling of the original device, while providing more power options for other instruments.

[0031] As shown in Figure 2 , 3 , 4, in one embodiment of the present application, in order to facilitate the installation and removal of the shell 1, the entire shell 1 is improved to be formed by a plurality of short pipes 11 inserted into each other. One of the joints of the adjacent two short pipes 11 can be completely inserted into the other. Corresponding positioning holes 13 are arranged at the joint of the adjacent two short pipes 11, the positioning holes 13 are perpendicular to the axis of the short pipe 11, threaded holes 141 with grooves 14 are arranged on both sides of the positioning holes 13, and T-shaped keys 15 are inserted into the positioning holes 13. The T-shaped keys 15 include a transverse positioning plate 151 and a vertical positioning rod 152, and a through hole 153 corresponding to the threaded hole 141 is arranged on the transverse positioning plate 151.

[0032] The vertical positioning rod 152 of the T-shaped key 15 is inserted into the positioning hole 13, and the transverse positioning plate 151 is clamped into the grooves 14 on both sides. After the insertion, the through hole 153 corresponds to the threaded hole 141, and the screw 16 is screwed into the threaded hole 141 to restrict the T-shaped key 15 in the positioning hole 13. In this embodiment, the T-shaped key 15 is slidably inserted into the positioning hole 13, and only the screw 16 needs to be removed to disassemble the adjacent two sections of the short pipe 11 without rotating the short pipe 11, which does not affect the connection of other short pipes 11.

[0033] In addition, in order to reduce the activity space of the vertical positioning rod 152, the positioning hole 13 and the vertical positioning rod 152 can be provided in a polygonal shape, such as a hexagonal hole or an octagonal column.

[0034] In one embodiment of the present application, in order to facilitate the threaded connection of the secondary piston sleeve 31 and the primary piston sleeve 23, an axially recessed rib hole 36 is provided at the end of the end of the secondary piston sleeve 31, which does not affect the installation of the piston head 41. The rib hole 36 can be used to insert a multi-angle wrench to rotate the secondary piston sleeve 31, thereby driving the other end to achieve threaded fixation with the primary piston sleeve 23. This embodiment does not need to provide a corresponding clamping position on the outer surface of the secondary piston sleeve 31, and the secondary piston sleeve 31 can be disassembled directly through the rib hole 36.

[0035] In one embodiment of the present application, each short section is divided into a lead screw short pipe 111 for installing the lead screw device 2, an oil pressure short pipe 112 for installing the oil pressure device 3, and an extraction short pipe 113 for installing the extraction device 4.

[0036] As shown in Figure 5 In order to reduce the number of components and make full use of the existing structure, the primary isolation sleeve 33 can be formed by the end of the oil pressure short pipe 112. That is, the end of the oil pressure short pipe 112 is inwardly retracted to form a convex ring protruding in the axial direction, and the inner ring surface of the convex ring is in sealing contact with the outer surface of the primary piston sleeve 23. This embodiment does not need to increase the step of installing a separate isolation sleeve, and also plays a better positioning role.

[0037] In order to improve the stability of the tail end of the housing 1, the sampling short pipe 113 is connected to the oil pressure short pipe 112 by threads. This connection structure can also make full use of the secondary isolation sleeve 34, and the secondary isolation sleeve 34 is used as a threaded mounting base to further optimize the installation and disassembly of the secondary isolation sleeve 34.

[0038] At this point, those skilled in the art will appreciate that although specific exemplary embodiments of the application have been described herein, the present application also encompasses many other variations or modifications in accordance with the principles of the application as set forth above. Accordingly, the scope of the present application should be understood to include all such variations and modifications.

Claims

1. A three-stage cylinder precision fluid suction structure comprising a hollow cylindrical housing, and a power unit installed in the housing to provide power to the outside by a plunger pump, characterized in that, A driving part is installed in the shell, which includes a screw rod device for converting circular motion into linear motion, an oil pressure device for providing hydraulic power to external instruments, and a pumping device for pumping underground liquid samples. The screw rod device includes a screw rod connected to the driving part at one end, a screw rod nut screwed on the outer surface of the screw rod, and a first piston sleeve sleeved on the outer surface of the screw rod nut and the screw rod, the first piston sleeve including a nut segment sleeved on the outer surface of the screw rod nut and a screw rod segment sleeved on the outer surface of the screw rod, the outer surface of the nut segment being in contact with the inner surface of the shell; an outwardly convex sliding block is provided on the outer surface of the nut segment, and an axial sliding groove accommodating the sliding block is provided on the inner surface of the shell. The oil pressure device includes a second piston sleeve threadedly connected to the other end of the first piston sleeve, the threadedly connected end of the second piston sleeve being in contact with the inner surface of the shell, and a first isolation sleeve and a second isolation sleeve are respectively installed on the first piston sleeve and the second piston sleeve to isolate the liquid flow in the adjacent space. The cavity between the first isolation sleeve and the second isolation sleeve forms a sealed hydraulic chamber, the second piston sleeve reciprocates in the cavity and separates the cavity into a left oil chamber and a right oil chamber, a sample chamber is formed between the second isolation sleeve and the end of the shell, and a piston head is located in the sample chamber and separates the sample chamber into a left extrusion chamber and a right extrusion chamber. The pumping device includes a piston head installed at the other end of the second piston sleeve, the outer surface of the piston head being in contact with the inner surface of the shell.

2. The three-stage cylinder precision fluid pumping structure according to claim 1, wherein the shell is formed by inserting multiple short pipes into each other, positioning holes are provided at the insertion positions of the adjacent two short pipes, threaded holes are provided on both sides of the positioning holes, T-shaped keys are inserted into the positioning holes, the T-shaped keys include transverse positioning plates and vertical positioning rods, through holes corresponding to the threaded holes are provided on the transverse positioning plates, and the inserted T-shaped keys are fixed by screws passing through the through holes and screwed into the threaded holes.

3. The three-stage cylinder precision fluid pumping structure according to claim 2, wherein the short pipes include a screw rod short pipe for installing the screw rod device, an oil pressure short pipe for installing the oil pressure device, and a pumping short pipe for installing the pumping device, and the pumping short pipe is threadedly connected to the oil pressure short pipe.

4. The three-stage cylinder precision fluid pumping structure according to claim 3, wherein the second isolation sleeve serves as a threaded connection base of the pumping short pipe and the oil pressure short pipe.

5. The three-stage cylinder precision fluid pumping structure according to claim 3, wherein the first isolation sleeve is formed by the end of the oil pressure short pipe.

6. The three-stage cylinder precision fluid pumping structure according to claim 1, wherein normal pressure hydraulic oil is injected into the cavity where the nut segment is located, and the normal pressure hydraulic oil in the cavities on both sides of the nut segment is communicated through the axial sliding groove.

7. The three-stage cylinder precision fluid pumping structure according to claim 1, wherein the threaded connection end of the second piston sleeve forms a sealed oil chamber with the first isolation sleeve and the second isolation sleeve, and high pressure hydraulic oil is provided to the connected instruments through a pipeline. ​ ​ ​ ​ ​ ​ ​ 8. The tertiary cylinder precision fluid pumping structure according to claim 1, wherein the piston head is fixed to the end of the secondary piston sleeve by a screw rod passing through the shaft center.

9. The tertiary cylinder precision fluid pumping structure according to claim 8, wherein an axial slot is provided on the end of the secondary piston sleeve where the piston head is installed, and the slot is used for inserting a polygonal wrench to screw the other end of the secondary piston sleeve with the primary piston sleeve.

10. The tertiary cylinder precision fluid pumping structure according to claim 1, wherein the nut section of the primary piston sleeve, the threaded connection end of the secondary piston sleeve, and the piston head are respectively in sliding sealing contact with the inner surface of the housing. ​ ​ ​

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