A shale gas logging device

Abstract

The application discloses a shale gas logging device, which comprises a top support fixedly installed above a shale gas vertical shaft wellhead, a downhole probe used for downhole logging, a connecting cable connected with the downhole probe, and a movable winding mechanism for winding the connecting cable, wherein a support connecting mechanism is arranged between the movable winding mechanism and the top support, and a decoking mechanism is connected between the connecting cable and the downhole probe; the decoking mechanism comprises a connecting column connected with the downhole probe and the cable and two opening components arranged at two ends of the connecting column and capable of being opened automatically when the connecting column is stuck. The connecting cable is retracted by the movable winding mechanism, so that the connecting column and the casing are displaced, the slide rod is pulled by the short shaft, the slide rod and the supporting rod connected with the slide rod are further rotated, the supporting rod is extended from the through slot, the decoking mechanism close to the well wall is pushed away, and the decoking mechanism is separated, so that the decoking is automatically completed.

Description

Technical Field

[0001] This invention relates to the field of shale gas logging, and more specifically to a shale gas logging device. Background Technology

[0002] Shale gas is a recoverable natural gas resource found in shale formations. China has substantial recoverable shale gas reserves. The formation and enrichment of shale gas have unique characteristics, often found in thick, widely distributed shale source rock formations within basins. Compared to conventional natural gas, shale gas development has advantages such as a longer production lifespan and production cycle. Most shale gas producing wells are widely distributed, thick, and generally gas-bearing, allowing them to produce gas at a stable rate over a long period.

[0003] Currently, when logging shale gas, the logging equipment usually needs to be lowered into the well for measurement and connected via cable. The logging probe is inserted vertically from the wellhead, and measurements are taken while the logging probe is being retrieved. When the cable is retracted, it slides on the inside of the well wall at bends and turns, which can wear grooves into the well wall. Since the logging probe is relatively large, it is easy for it to get stuck in the grooves worn by the cable when passing through.

[0004] Therefore, it is necessary to invent a shale gas logging device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a shale gas logging device to address the aforementioned shortcomings in the technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a shale gas logging device, comprising a top support fixedly installed above the wellhead of a shale gas vertical shaft, a downhole probe for downhole logging, a connecting cable connecting the downhole probe, and a movable winding mechanism for winding the connecting cable, wherein a support connection mechanism is provided between the movable winding mechanism and the top support, and a release mechanism is provided between the connecting cable and the downhole probe. The unblocking mechanism includes a connecting column that connects the downhole probe to the cable and two opening components that automatically open when the connecting column is stuck. Preferably, the release mechanism further includes two sleeves, which are respectively sleeved on the outside of the two spreading components, and a connecting component is provided between the two sleeves.

[0007] Preferably, a sliding sleeve is provided at the center of the sleeve, and a connecting frame is fixedly connected between the sliding sleeve and the sleeve. The sliding sleeve slides outside the connecting column, and the connecting column is disposed between the two sleeves. A return spring is installed at both ends of the connecting column, and the end of the return spring is connected to the sleeve.

[0008] Preferably, the spreading assembly includes multiple through slots and multiple support rods, with each support rod corresponding to one of the multiple through slots. The multiple through slots are formed in a ring shape on the outside of the sleeve. One end of each support rod is hinged to a connecting column, and a movable wheel is fixedly installed on the other end of each support rod.

[0009] Preferably, the spreading assembly further includes a slide bar installed on one side of the support rod, a plurality of short shafts corresponding one-to-one with the slide bar, a fixing frame provided on the outside of the short shaft, the short shaft being rotatably connected to the fixing frame, the fixing frame being fixedly installed inside the sleeve, a sliding groove passing through the center of the short shaft, and the slide bar passing through the sliding groove and being slidably connected to the sliding groove.

[0010] Preferably, the connecting assembly includes a connector and connecting rods. The connector is disposed between two sleeves and passes through a connecting post. The connector is movably connected to the connecting post via a pivot. Connecting rods are hinged to both ends of the connector, and the other ends of the two connecting rods are respectively hinged to the two sleeves.

[0011] Preferably, a main shaft is mounted on the top of the top bracket, and a pulley is mounted at the center of the main shaft, the pulley being adapted to the connecting cable.

[0012] Preferably, the movable winding mechanism includes a winch for winding the connecting cable and a vehicle body for loading the winch, the winch being fixedly mounted on the top of the vehicle body, and the connecting cable being wound around the outside of the winch's winding roller.

[0013] Preferably, the bracket connection mechanism includes a pin installed on one side of the vehicle body and a limiting block installed on one side of the top bracket. The limiting block matches the pin, and the pin is shaped as a right-angled triangle.

[0014] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. The connecting cable is retracted by the movable winding mechanism, causing the connecting cable to move the connecting column and the casing. The short shaft moves relative to the connecting column as the casing moves. The short shaft pulls the slide rod on one side of the support rod and slides along the slide rod, thereby driving the slide rod and the support rod connected to it to rotate. This causes the support rod to extend out of the through groove and push away the unjamming mechanism close to the well wall, thus disengaging the unjamming mechanism. The unjamming can be completed automatically as the connecting cable is retracted.

[0015] 2. By setting a connecting component between the two opening components, the two opening components can be opened simultaneously. The opening component at the top is close to the inside of the bend and is pushed outward so that it is close to the center of the shale gas well. The opening component at the bottom is close to the outside of the bend and is pushed inward so that it is close to the center of the shale gas well, thereby straightening the unblocking mechanism.

[0016] 3. By pushing the vehicle body, the pin is inserted into the limit block, and then the movable winding mechanism can be fixed. At the same time, the connecting cable for going down into the well can be quickly positioned by the pulley set on the top of the top bracket, making it more convenient to use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the overall structure of the top support of the present invention.

[0020] Figure 3 This is a schematic diagram of the overall structure of the active winding mechanism of the present invention.

[0021] Figure 4 This is a perspective view of the card release mechanism of the present invention when it is opened.

[0022] Figure 5 This is a schematic diagram of the cooperation structure between the support component and the connecting column of the present invention.

[0023] Figure 6 This is a perspective view of the card release mechanism of the present invention when it is stored.

[0024] Figure 7 This is a partial cross-sectional view of the card release mechanism of the present invention.

[0025] Figure 8 For the present invention Figure 7 Enlarged view of the structure of part A.

[0026] Figure 9 This is a schematic diagram of the mating structure of the slide bar and the slide groove of the present invention.

[0027] Figure 10 This is a schematic diagram of the internal structure of the sleeve of the present invention.

[0028] Figure 11 This is a schematic diagram of the state when the present invention encounters a jam.

[0029] Figure 12 This is a schematic diagram of the state when the card is removed according to the present invention.

[0030] Explanation of reference numerals in the attached figures: 1. Top support; 2. Movable winding mechanism; 3. Support connection mechanism; 4. Connecting cable; 5. Downhole probe; 6. Unlocking mechanism; 11. Main shaft; 12. Pulley; 21. Car body; 22. Winch; 31. Limit block; 32. Pin; 61. Connecting post; 62. Sleeve; 63. Spreading assembly; 64. Connecting assembly; 65. Sliding sleeve; 66. Connecting bracket; 67. Return spring; 631. Through groove; 632. Support rod; 633. Playing wheel; 634. Slide rod; 635. Short shaft; 636. Fixing frame; 637. Slide groove; 641. Connector; 642. Connecting rod. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1 This invention provides, for example Figure 1-12 The shale gas logging device shown includes a top support 1 fixedly installed above the wellhead of a shale gas vertical shaft, a downhole probe 5 for downhole logging, a connecting cable 4 connecting the downhole probe 5, and a movable winding mechanism 2 for winding the connecting cable 4. A support connection mechanism 3 is provided between the movable winding mechanism 2 and the top support 1, and a release mechanism 6 is connected between the connecting cable 4 and the downhole probe 5.

[0033] A main shaft 11 is mounted on the top of the top bracket 1, and a pulley 12 is mounted at the center of the main shaft 11. The pulley 12 is adapted to the connecting cable 4.

[0034] It should be noted that during well logging, the downhole probe 5 is generally lowered to the bottom of the well via the connecting cable 4, and then the downhole probe 5 is slowly retrieved. The shale gas wells at different depths are then surveyed in sequence. The top support 1 is fixedly installed above the wellhead of the shale gas vertical well, which can fix the pulley 12 above the wellhead, so as to quickly position the connecting cable 4 in the center of the vertical well.

[0035] In actual use, the connecting cable 4 is wound on the movable winding mechanism 2, which can move freely. When used multiple times, the connecting cable 4 only needs to be passed through the pulley 12 to position it. There is no need to adjust the position of the movable winding mechanism 2 each time, which saves logging time. In addition, the unsticking mechanism 6 is connected to one end of the top connecting cable 4, and the downhole probe 5 is movably connected to the unsticking mechanism 6. Different downhole probes 5 can be used to explore different shale gas well parameters. Furthermore, the signal connection between the unsticking mechanism 6 and the connecting cable 4 is maintained, which can significantly reduce equipment costs.

[0036] It should be noted that the unblocking mechanism 6 is mainly designed for bends in shale gas wells. During logging, when the connecting cable 4 is retracted, the connecting cable 4 will continuously rub against the inner side of the bend, thus creating a groove on the inner side of the bend. Figure 11 When the probe, which has a larger volume at the bottom of the connecting cable 4, moves to the position of the groove, it will get stuck in the groove, hindering the rise of the connecting cable 4. The function of the unblocking mechanism 6 is to automatically unblock when stuck, without affecting the surveying process.

[0037] Furthermore, the unblocking mechanism 6 includes a connecting post 61 connecting the downhole probe 5 and the cable 4, and two opening components 63 disposed at both ends of the connecting post 61 that automatically open when encountering a jam. It should be noted that, referring to Figure 11 When the connecting cable 4 drives the unblocking mechanism 6 to rise and gets stuck in the groove on the inside of the bend, the entire downhole device will tilt towards the inside of the bend in the well wall, causing it to get stuck. At this time, as the movable winding mechanism 2 retracts the connecting cable 4, the tension of the connecting cable 4 on the unblocking mechanism 6 increases, causing the two opening components 63 to open. Figure 12 As shown, the unblocking mechanism 6, which is close to the well wall, is forcibly pushed away, thereby disengaging the unblocking mechanism 6, which can then be removed from the well by ascending the connecting cable 4.

[0038] Additionally, by providing support components 63 at both ends of the connecting column 61, such as... Figure 11 As shown, the top-positioned expansion component 63 is close to the inside of the bend. Pushing the expansion component 63 outward brings it closer to the center of the shale gas well. Meanwhile, the bottom-positioned expansion component 63 is close to the outside of the bend. Pushing the expansion component 63 inward brings it closer to the center of the shale gas well, thus straightening the unblocking mechanism 6 and disengaging it.

[0039] Furthermore, the unblocking mechanism 6 also includes two sleeves 62, which are respectively sleeved on the outside of the two spreading components 63, and a connecting component 64 is provided between the two sleeves 62.

[0040] It should be noted that one end of the connecting cable 4 is connected to the top of the connecting post 61, and the connecting post 61 maintains a communication connection with the downhole probe 5. The two casings 62 are connected by the connecting component 64. When the top casing 62 moves, it can drive the other casing 62 to move, so that the two casings 62 keep synchronized, and thus the two opening components 63 can open synchronously.

[0041] When in use, when encountering a groove on the inside of a bend, the sleeve 62 is stuck, and the connecting cable 4 moves with the movable winding mechanism 2, which in turn drives the connecting post 61 to move, causing the sleeve 62 to be displaced relative to the corresponding connecting post 61. This causes the sleeve 62 to drive the opening assembly 63, and through the connecting assembly 64, it drives the bottom sleeve 62 to drive the two opening assemblies 63 to open synchronously.

[0042] Furthermore, a sliding sleeve 65 is provided at the center of the sleeve 62, and a connecting frame 66 is fixedly connected between the sliding sleeve 65 and the sleeve 62. The sliding sleeve 65 slides outside the connecting post 61. The connecting post 61 is located between the two sleeves 62. A return spring 67 is installed at both ends of the connecting post 61, and the end of the return spring 67 is connected to the sleeve 62.

[0043] The sleeve 65 is fixedly installed inside the sleeve 62, which can limit the sleeve 62 and ensure that the sleeve 62 is sleeved on the outside of the connecting post 61 and slides on the connecting post 61. At the same time, the reset spring 67 can ensure that the two sleeves 62 are initially located at a relatively far distance, so that the spreading component 63 is kept in a contracted state.

[0044] Furthermore, the spreading assembly 63 includes multiple through slots 631 and multiple support rods 632, with each support rod 632 corresponding to one of the multiple through slots 631. The multiple through slots 631 are formed in a ring shape on the outside of the sleeve 62. One end of each support rod 632 is hinged to the connecting post 61, and the other end of each support rod 632 is fixedly mounted with a movable wheel 633.

[0045] It should be noted that when not stuck, in the initial state, the support rod 632 is vertical and housed inside the casing 62. As the unblocking mechanism 6 is stuck, the support rod 632 gradually rotates along the hinge point with the connecting column 61, causing one end of the connecting movable wheel 633 to extend out of the through groove 631 and then contact the well wall, thus releasing the unblocking mechanism 6 from the stuck state. By installing the movable wheel 633 at the end of the support rod 632, when the support rod 632 extends, the movable wheel 633 contacts the well wall, which can prevent the support rod 632 from inserting into the well wall and thus being unable to unblock. At the same time, the movable wheel 633 rolls with the well wall, which can also assist the logging device in unblocking.

[0046] Furthermore, the spreading assembly 63 also includes a sliding rod 634 installed on one side of the support rod 632, and a plurality of short shafts 635 corresponding one-to-one with the sliding rod 634. A fixing frame 636 is provided on the outside of the short shaft 635, and the short shaft 635 is rotatably connected to the fixing frame 636. The fixing frame 636 is fixedly installed inside the sleeve 62. A sliding groove 637 passes through the center of the short shaft 635, and the sliding rod 634 passes through the sliding groove 637 and is slidably connected to the sliding groove 637.

[0047] Among them, the short shaft 635 moves relative to the connecting post 61 as the sleeve 62 moves, such as Figure 7-10 As shown, the short shaft 635 pulls the slide bar 634 on one side of the support rod 632 and slides along the slide bar 634, thereby driving the slide bar 634 and the support rod 632 connected thereto to rotate, so that the support rod 632 extends out of the through groove 631.

[0048] It should be noted that the short shaft 635 slides with the slide rod 634 through the slide groove 637 opened in its center. As the support rod 632 extends, the angle of the slide rod 634 will change. At this time, in order to make the slide groove 637 fit with it, the short shaft 635 needs to be rotatably connected to the fixed frame 636. The angle of the slide groove 637 can be automatically adjusted with the movement of the slide rod 634 so that it always fits with the slide rod 634 and avoids it from obstructing the extension of the support rod 632.

[0049] The connecting assembly 64 includes a connector 641 and a connecting rod 642. The connector 641 is disposed between two sleeves 62 and passes through a connecting post 61. The connector 641 is movably connected to the connecting post 61 via a pivot. Both ends of the connector 641 are hinged with connecting rods 642, and the other ends of the two connecting rods 642 are respectively hinged to the two sleeves 62.

[0050] It should be noted that the connector 641 is located inside the connecting post 61 and is connected to the two sleeves 62 through the connecting rods 642 at both ends. When the top sleeve 62 moves relative to the connecting post 61, the connecting rod 642 drives one end of the connector 641 to rotate, which in turn drives the other connecting rod 642 to move the other sleeve 62. This causes the two sleeves 62 to move synchronously, cooperating with the opening assembly 63 to open the two opening assemblies 63 simultaneously.

[0051] Example 2 Based on the movable winding mechanism 2 and the support connection mechanism 3 proposed in the embodiments, the invention provides as follows: Figure 1-3 Further technical solutions.

[0052] The movable winding mechanism 2 includes a winch 22 for winding the connecting cable 4 and a vehicle body 21 for loading the winch 22. The winch 22 is fixedly installed on the top of the vehicle body 21, and the connecting cable 4 is wound around the outside of the winding roller of the winch 22.

[0053] By using the vehicle body 21 to install the winch 22, the winch 22 can be moved easily. When not in use, the vehicle body 21 can be easily pushed to store the winch 22. In addition, the winch 22 needs to be of high precision so as to accurately control the position of the downhole probe 5 so as to correspond the survey data of the downhole probe 5 with the downhole height data.

[0054] The bracket connection mechanism 3 includes a pin 32 installed on one side of the vehicle body 21 and a limiting block 31 installed on one side of the top bracket 1. The limiting block 31 matches the pin 32, and the shape of the pin 32 is set as a right triangle.

[0055] It should be noted that the side of the top bracket 1 with the limiting block 31 needs to be left open to facilitate connection with the vehicle body 21. The movable vehicle body 21 is limited by the cooperation of the pin 32 and the limiting block 31. At the same time, the right-angled triangle design results in a larger gap between the limiting block 31 and the pin 32 when the pin 32 is inserted, making it easier to insert. It can be fully inserted and tightly fitted to achieve fixation between the two. During operation, the movable winding mechanism 2 is fixed to the top bracket 1 by the gravity of the connecting cable 4, the downhole probe 5, and the release mechanism 6. No additional fixing means are required. After completion, the vehicle body 21 can be directly pushed out, making it more convenient to use.

[0056] Working principle of this invention: Refer to the instruction manual appendix Figure 1-12 The downhole probe 5 is lowered to the bottom of the well via the connecting cable 4, and then slowly retrieved. The probe is then used to survey shale gas wells at different depths. When the connecting cable 4 drives the release mechanism 6 to rise and gets stuck in the groove inside the bend, the entire downhole device will tilt towards the inside of the well wall bend, causing it to become stuck. At this point, as the movable winding mechanism 2 retracts the connecting cable 4, the connecting cable 4 causes the connecting column 61 and the casing 62 to shift. The short shaft 635 moves relative to the connecting column 61 as the casing 62 moves. The short shaft 635 pulls the sliding rod 634 on one side of the support rod 632 and slides along the sliding rod 634, thereby causing the sliding rod 634 and the connected support rod 632 to rotate. This causes the support rod 632 to extend out of the through groove 631, opening the spreading component 63 and pushing the release mechanism 6 away from the well wall, thus allowing the release mechanism 6 to disengage. The device can then be retrieved from the well as the connecting cable 4 rises.

[0057] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A shale gas logging device, characterized in that: It includes a top support (1) fixedly installed above the wellhead of a shale gas vertical shaft, a downhole probe (5) for downhole logging, a connecting cable (4) connecting the downhole probe (5), and a movable winding mechanism (2) for winding the connecting cable (4). A support connection mechanism (3) is provided between the movable winding mechanism (2) and the top support (1), and a release mechanism (6) is provided between the connecting cable (4) and the downhole probe (5). The unblocking mechanism (6) includes a connecting post (61) connecting the downhole probe (5) and the cable (4) and two opening components (63) set at both ends of the connecting post (61) to automatically open when it gets stuck. The card release mechanism (6) also includes two sleeves (62), which are respectively sleeved on the outside of the two spreading components (63), and a connecting component (64) is provided between the two sleeves (62). A sliding sleeve (65) is provided at the center of the sleeve (62). A connecting frame (66) is fixedly connected between the sliding sleeve (65) and the sleeve (62). The sliding sleeve (65) slides outside the connecting post (61). The connecting post (61) is located between the two sleeves (62). A return spring (67) is installed at both ends of the connecting post (61). The end of the return spring (67) is connected to the sleeve (62). The spreading assembly (63) includes multiple through slots (631) and multiple support rods (632). The multiple support rods (632) correspond one-to-one with the multiple through slots (631). The multiple through slots (631) are opened in a ring on the outside of the sleeve (62). One end of the support rod (632) is hinged to the connecting column (61), and the other end of the support rod (632) is fixedly installed with a movable wheel (633). The spreading assembly (63) also includes a slide rod (634) installed on one side of the support rod (632), a plurality of short shafts (635) corresponding one-to-one with the slide rod (634), a fixing frame (636) is provided on the outside of the short shaft (635), the short shaft (635) is rotatably connected to the fixing frame (636), the fixing frame (636) is fixedly installed inside the sleeve (62), a sliding groove (637) is passed through the center of the short shaft (635), the slide rod (634) passes through the sliding groove (637) and is slidably connected to the sliding groove (637); The connecting assembly (64) includes a connector (641) and a connecting rod (642). The connector (641) is disposed between two sleeves (62). The connector (641) passes through the connecting post (61). The connector (641) is movably connected to the connecting post (61) via a rotating shaft. Both ends of the connector (641) are hinged with connecting rods (642). The other ends of the two connecting rods (642) are respectively hinged to the two sleeves (62).

2. The shale gas logging device according to claim 1, characterized in that: The top of the top bracket (1) is equipped with a main shaft (11), and a pulley (12) is installed at the center of the main shaft (11). The pulley (12) is adapted to the connecting cable (4).

3. A shale gas logging device according to claim 2, characterized in that: The active winding mechanism (2) includes a winch (22) for winding the connecting cable (4) and a vehicle body (21) for loading the winch (22). The winch (22) is fixedly mounted on the top of the vehicle body (21), and the connecting cable (4) is wound around the outside of the winding roller of the winch (22).

4. A shale gas logging device according to claim 3, characterized in that: The bracket connection mechanism (3) includes a pin (32) installed on one side of the vehicle body (21) and a limiting block (31) installed on one side of the top bracket (1). The limiting block (31) matches the pin (32), and the shape of the pin (32) is set as a right triangle.

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