Passive self-adaptive pushing equipment for seismic instrument in well

Abstract

The invention discloses passive self-adaptive sidewall contact equipment for a seismic instrument in a well. The passive self-adaptive sidewall contact equipment comprises a sidewall contact main body, an upper connecting block, a lower connecting block and a support arm assembly, wherein the upper connecting block and the lower connecting block are fixed at two end parts of the sidewall contact main body in an embracing manner, and the support arm assembly is assembled on the sidewall contact main body. The pushing main body is matched with the upper connecting block and the lower connecting block to clamp and fix a seismic instrument (geophone) in a well; the pushing main body is matched with the support arm assembly to form a triangular support with adjustable height, so that the pushing device can be adaptive to different well hole sizes, pushing of the seismic instrument in the well to the well wall is completed, and good coupling of the seismic instrument in the well and the well wall is guaranteed. Compared with a pushing structure that a pushing arm is controlled by a motor to press a seismic instrument in a well to a well wall in the prior art, the mechanical pushing device is not limited by temperature resistance and pressure resistance of electronic components, can stably work at different temperatures and pressures, and is simple in structure and convenient to operate. And the stability and the reliability of the operation of the seismic instrument in the well are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of geophysical exploration, and relates to a device used in borehole seismic exploration, specifically a self - powered adaptive pushing device for borehole seismic instruments. Background Technique

[0002] Borehole seismic is a geophysical exploration method that relies on boreholes for seismic wave acquisition, mainly using the vertical seismic profile method (VSP), and generally also includes various observation methods such as cross - hole seismic and micro - seismic fracturing monitoring. Compared with surface seismic, borehole seismic data has the advantages of high signal - to - noise ratio, wide frequency band, rich wave field, and obvious dynamic and kinematic characteristics of seismic waves. With the continuous deepening of the exploration and development research of oil and gas reservoirs, borehole seismic technology, as a high - resolution seismic exploration method, has received more and more attention. Since it combines the data characteristics of seismic, logging, surface, and borehole, etc., it has become a bridge and link connecting multi - disciplinary oil and gas exploration methods.

[0003] In borehole seismic, seismic waves are excited on the surface and then observed on multi - level multi - component geophones arranged at different depths along the borehole. Since borehole seismic instruments - geophones are usually moving - coil geophones, they need to be well - coupled with the borehole wall after being placed inside the formation through the borehole to collect high - quality formation signals. Currently, in China, most use motor - controlled pushing arms to press the borehole seismic instrument against the borehole wall. This pushing device usually has the following problems when applied: Firstly, the downhole environment is harsh, and motors and corresponding control circuits that can withstand high temperature and high pressure need to be configured, with relatively high technical difficulty; Secondly, the high - temperature and high - pressure downhole environment affects the working reliability and stability of electronic products (motors, control circuits, etc.), and the safety and controllability are relatively low. If the pushing device works unstably, it will not only affect production efficiency, but seriously may even lead to the accident of the three - component geophone array falling into the well, causing property losses. Moreover, if the three - component geophone array cannot be salvaged successfully, it will cause the abandonment of the observation well project, resulting in secondary accidents and greater property losses. Summary of the Invention

[0004] To solve the above - mentioned deficiencies in the prior art, the present invention aims to provide a self - powered adaptive pushing device for borehole seismic instruments to improve the operation stability and reliability of borehole seismic instruments.

[0005] To achieve the above - mentioned purpose, the technical solution adopted by the present invention is as follows: A self - powered adaptive pushing device for borehole seismic instruments includes a pushing main body, an upper connection block and a lower connection block that are clamped and fixed at both ends of the pushing main body to realize the clamping of the seismic instrument, and a support arm assembly assembled on the pushing main body; Both ends of the pushing body are respectively provided with an upper sliding groove and a lower sliding groove along the length direction. The upper sliding groove is located on the opposite side of the upper connecting block, and the lower sliding groove is located on the opposite side of the lower connecting block. The arm assembly includes an upper spring rod slidably assembled in the upper sliding groove, a first compression spring sleeved on the upper spring rod and limited in the upper sliding groove, an upper arm hinged to the upper spring rod, a lower spring rod slidably assembled in the lower sliding groove, a second compression spring sleeved on the lower spring rod and limited in the lower sliding groove, and a lower arm hinged to the lower spring rod. Among them, the upper arm is hinged to the lower arm, and the sum of their lengths is greater than the distance between the upper sliding groove and the lower sliding groove. A roller is rotatably connected to the hinged part of the upper arm and the lower arm.

[0006] As a limitation of the present invention, a plurality of protrusions for contacting the inner wall of the wellbore are fixedly provided on the outer side walls of the upper connecting block and the lower connecting block.

[0007] As another limitation of the present invention, the upper sliding groove and the lower sliding groove have the same structure. One end close to the end of the pushing body is a closed end, and the end far from the end of the pushing body is an open end. A limit screw is threadedly assembled at the open end position to prevent the spring rod from disengaging from the sliding groove.

[0008] As a further limitation of the present invention, on the pushing body, T-shaped grooves are provided on the outer sides of the closed ends of the upper sliding groove and the lower sliding groove. The T-shaped groove is communicated with the sliding groove so that the spring rod can extend from the sliding groove into the corresponding T-shaped groove.

[0009] Due to the adoption of the above technical solution, compared with the prior art, the beneficial effects obtained by the present invention are: (1) The present invention proposes a pure mechanical pushing device, which can adapt to different wellbore sizes, and can obtain corresponding pushing forces by replacing compression springs of different models. Most importantly, compared with the pushing structure in the prior art where a motor controls the pushing arm to press the downhole seismic instrument against the well wall, the present invention is not limited by the temperature and pressure resistance performance of electronic components and can work stably at different temperatures and pressures, thereby effectively improving the stability and reliability of the downhole seismic instrument operation and achieving the purpose of successful data acquisition with the device lowered into the well once.

[0010] (2) Protrusions are provided on the outer side walls of both the upper connecting block and the lower connecting block of the present invention. On the premise of ensuring good coupling between the downhole seismic instrument and the well wall, the contact area with the well wall can be reduced. Furthermore, in cooperation with the rollers rotatably connected to the hinged part of the upper arm and the lower arm on the opposite side, the downhole seismic instrument can be lowered and lifted freely and flexibly in the wellbore.

[0011] (3) In the present invention, T-shaped grooves are provided at both ends of the pushing body. In addition to accommodating the inserted spring rod when adjusting the triangular support structure formed by the upper arm and the lower arm, it can also cooperate with a special platform with T-shaped protrusions to achieve the temporary fixation of the present invention on the special platform, thereby avoiding rotation when disassembling the upper connecting block or the lower connecting block, and effectively improving the disassembly and assembly efficiency of the present invention.

[0012] In summary, the present invention greatly simplifies the design and manufacture of the pushing device for borehole seismic instruments. It is small, light, and portable as a whole. During on-site construction, it is easy to operate and maintain. It can press the borehole seismic instrument against the well wall for a long time, enabling the borehole seismic instrument to work reliably and stably, filling the gap of the self-powered adaptive pushing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 It is a schematic diagram of the structural relationship of an embodiment of the present invention; Figure 2 It is a schematic diagram of the structural relationship of the embodiment of the present invention from another angle; Figure 3 It is a schematic diagram of the disassembled structure of the embodiment of the present invention; Figure 4 It is a top view of the structural relationship of the embodiment of the present invention (the upper arm and the lower arm are abutted against one side of the pushing body); Figure 5 It is a schematic diagram of the end structure of the pushing body in the embodiment of the present invention; Figure 6 It is a schematic diagram of the application structure of the embodiment of the present invention.

[0015] In the figure: 1. Pushing body; 2. Upper connecting block; 3. Lower connecting block; 4. Arm assembly; 5. Upper sliding groove; 6. Lower sliding groove; 7. Limit screw; 8. T-shaped groove; 9. Protrusion; 10. Borehole seismic instrument; 101. Upper spring rod; 102. First compression spring; 103. Upper arm; 104. Lower spring rod; 105. Second compression spring; 106. Lower arm; 107. Roller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and understanding the present invention, and are not used to limit the present invention.

[0017] Embodiment An self-powered adaptive pushing device for borehole seismic instruments As Figures 1 to 4As shown in the figure, this embodiment includes a pushing main body 1, an upper connecting block 2, a lower connecting block 3, and an arm assembly 4. The pushing main body 1 cooperates with the upper connecting block 2 and the lower connecting block 3 to hold and fix the downhole seismic instrument 10 (geophone); the pushing main body 1 cooperates with the arm assembly 4 to form a triangular support with adjustable height. As Figure 1 shown, and then after being vertically placed into the wellbore, it can adapt to different wellbore sizes, complete the pushing of the downhole seismic instrument 10 against the wellbore wall, and ensure good coupling between the downhole seismic instrument 10 and the wellbore wall.

[0018] I. Pushing main body 1, upper connecting block 2, and lower connecting block 3 The pushing main body 1, the upper connecting block 2, and the lower connecting block 3 are all made of metal, preferably aluminum alloy with a relatively light mass. Among them, the length dimension of the pushing main body 1 is adapted to the existing downhole seismic instrument 10. One side of it is set as an arc shape adapted to the shape of the downhole seismic instrument 10, and both ends of it are set as semi-circular shapes that can cooperate with the upper connecting block 2 / lower connecting block 3 to realize the holding and fixing of the downhole seismic instrument 10; both the upper connecting block 2 and the lower connecting block 3 are semi-circular structures, and after being aligned with the ends of the pushing main body 1, they can form an annular structure to complete the holding and fixing of the upper end / lower end of the downhole seismic instrument 10.

[0019] In this embodiment, the upper connecting block 2 and the lower connecting block 3 are each assembled on the pushing main body 1 through a plurality of screws for easy disassembly and assembly.

[0020] Furthermore, upper sliding grooves 5 and lower sliding grooves 6 are arranged at both ends of the pushing main body 1 extending towards the center of the pushing main body 1 along the length direction. As Figure 1 shown, the upper sliding groove 5 is located on the opposite side of the upper connecting block 2, and the lower sliding groove 6 is located on the opposite side of the lower connecting block 3. The upper sliding groove 5 and the lower sliding groove 6 have the same structure. Taking the upper sliding groove 5 as an example, its structure is described as follows: As Figure 1 and Figure 5 shown, the upper sliding groove 5 is a rectangular groove. One end close to the end of the pushing main body 1 is a closed end, and the end far from the end of the pushing main body 1 is an open end. Limiting grooves are arranged on both side walls of the rectangular groove along its length direction. A limiting screw 7 for blocking the side-end opening of the limiting groove is assembled outside the open end of the upper sliding groove 5 through threads.

[0021] On the pushing main body 1, T-shaped grooves 8 are arranged on the outside of the closed ends of the upper sliding groove 5 and the lower sliding groove 6. As Figure 3 , Figure 4 shown. And, a through hole for connection and communication is provided between the T-shaped groove 8 and the sliding groove (the sliding groove in this embodiment refers to the upper sliding groove 5 or the lower sliding groove 6 corresponding to the T-shaped groove 8).

[0022] A plurality of protrusions 9 for directly contacting the inner wall of the wellbore are fixedly arranged on the outer side walls of the upper connecting block 2 and the lower connecting block 3. As Figure 2As shown, under the premise of ensuring good coupling between the seismic instrument 10 in the well and the well wall, the protrusion 9 can reduce the contact area with the well wall, thereby reducing the friction.

[0023] 2. Arm assembly 4 The arm assembly 4 is assembled on the above-mentioned pushing body 1, and is used to apply a pushing force to make the seismic instrument 10 in the well well coupled with the well wall. Figure 1 , Figure 3 As shown, the arm assembly 4 includes an upper spring rod 101, a first compression spring 102, an upper arm 103, a lower spring rod 104, a second compression spring 105 and a lower arm 106. The upper spring rod 101 is slidably assembled in the upper slide groove 5, as shown in FIG. Figure 5 As shown, it is a T-shaped rod, the two sides of the top are placed in the above-mentioned limiting grooves, and the bottom is placed in the through hole between the T-shaped groove 8 and the upper slide groove 5. Under the action of the limiting screw 7, the upper spring rod 101 cannot be separated from the upper slide groove 5; the first compression spring 102 is sleeved on the upper spring rod 101 and is limited in the upper slide groove 5; the upper support arm 103 is hinged to the top of the upper spring rod 101. Similarly, the lower spring rod 104 is slidably assembled in the lower slide groove 6 in the same way as the upper spring rod 101; the second compression spring 105 is sleeved on the lower spring rod 104 and is limited in the lower slide groove 6; the lower support arm 106 is hinged to the top of the lower spring rod 104.

[0024] Furthermore, the upper arm 103 is hinged to the lower arm 106, and the sum of the lengths of the upper arm 103 and the lower arm 106 is greater than the distance between the upper slide groove 5 and the lower slide groove 6. Under the action of the spring rod (i.e., the upper spring rod 101 and the lower spring rod 104) and the compression spring (i.e., the first compression spring 102 and the second compression spring 105), the upper arm 103 and the lower arm 106 form a triangular support structure on the push body 1 (in a natural state). By pressing down the upper arm 103 and the lower arm 106 so that the spring rod slides in the corresponding slide groove, the formed triangular support structure can be adjusted to adapt to wellbores of different sizes (the maximum size that can place the upper arm 103 and the lower arm 106 against the push body 1, such as Figure 4 By replacing different types of compression springs, different sizes of pushing forces can be obtained.

[0025] After being lowered into the wellbore, the hinge point between the upper arm 103 and the lower arm 106 is always in contact with the well wall under the action of the compression spring. Therefore, in this embodiment, a roller 107 is rotatably connected to the hinge to reduce friction.

[0026] When using this embodiment, first select a compression spring of the corresponding model according to the borehole diameter and the required pushing force; then assemble the support arm assembly 4 on the pushing main body 1; then temporarily fix the pushing main body 1 on a special platform with a T-shaped bump by using the T-shaped groove 8. After placing the downhole seismic instrument 10 into the well, fasten and install the upper connecting block 2 and the lower connecting block 3, and conduct debugging to complete the clamping of the downhole seismic instrument 10, as Figure 6 shown. After completely clamping the first-stage downhole seismic instrument 10 and the second-stage downhole seismic instrument 10 according to the above steps, start the data acquisition work by lowering them into the well in sequence according to the instrument lowering order; after the acquisition is completed, disassemble the downhole seismic instrument 10 from this embodiment and pack it into a box.

[0027] It should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the above embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A self - powered adaptive pushing device for borehole seismic instruments, characterized in that: It includes a pushing main body, an upper connecting block and a lower connecting block that are clamped and fixed at both ends of the pushing main body to realize the clamping of the seismic instrument, and an arm assembly assembled on the pushing main body; Upper sliding grooves and lower sliding grooves are respectively formed at both ends of the pushing main body along the length direction. The upper sliding groove is located on the opposite side of the upper connecting block, and the lower sliding groove is located on the opposite side of the lower connecting block; The arm assembly includes an upper spring rod slidably assembled in the upper sliding groove, a first compression spring sleeved on the upper spring rod and limited in the upper sliding groove, an upper arm hinged to the upper spring rod, a lower spring rod slidably assembled in the lower sliding groove, a second compression spring sleeved on the lower spring rod and limited in the lower sliding groove, and a lower arm hinged to the lower spring rod; wherein, the upper arm is hinged to the lower arm, and the sum of their lengths is greater than the distance between the upper sliding groove and the lower sliding groove; A roller is rotatably connected to the hinged part of the upper arm and the lower arm.

2. The self - powered adaptive pushing device for borehole seismic instruments according to claim 1, characterized in that: A plurality of protrusions for contacting the inner wall of the wellbore are fixed on the outer side walls of the upper connecting block and the lower connecting block.

3. The self - powered adaptive pushing device for borehole seismic instruments according to claim 1 or 2, characterized in that: The upper sliding groove and the lower sliding groove have the same structure. One end close to the end of the pushing main body is a closed end, and the end far from the end of the pushing main body is an open end; A limit screw is threadedly assembled at the open end position to prevent the spring rod from disengaging from the sliding groove.

4. The self - powered adaptive pushing device for borehole seismic instruments according to claim 3, characterized in that: On the pushing main body, T-shaped grooves are provided on the outer sides of the closed ends of the upper sliding groove and the lower sliding groove; The T-shaped groove is communicated with the sliding groove so that the spring rod can extend from the sliding groove into the corresponding T-shaped groove.

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