Device for underground positioning detection of natural hydrogen

Abstract

The invention relates to an underground natural hydrogen positioning and detecting device which comprises an upper positioning assembly, an upper supporting disc, a motor, a first driver, a lower supporting disc and a lower positioning assembly from top to bottom, and the motor is connected with the top of the first driver and drives the first driver to rotate; the side face of the first driver is connected with a plurality of detection boxes on the lower supporting disc and used for pushing the detection boxes to the underground side wall, and hydrogen detectors are arranged in the detection boxes and used for detecting natural hydrogen released by the underground side wall. The lower positioning assembly comprises a driver II and a plurality of telescopic lower positioning rods, the plurality of lower positioning rods point to different directions in the well respectively, and the lower positioning rods abut against the side wall of the well after extending to serve as lower guide rails of the detection box and fix the lower supporting disc and the upper supporting disc at the same time; the upper positioning assembly comprises a third driver and a plurality of telescopic upper positioning rods, the upper positioning rods correspond to the lower positioning rods in a one-to-one mode, and the upper positioning rods abut against the well side wall after extending to serve as upper guide rails of the detection box.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground or downhole natural hydrogen detection, and particularly relates to a device for downhole positioning and detection of natural hydrogen. Background Art

[0002] In the field of natural gas and underground gas reservoir mining, the hydrogen content in natural gas is an important indicator for evaluating the quality of natural gas, and is crucial to the subsequent safe transportation and utilization of natural gas. Excessive underground hydrogen concentration will not only lead to energy waste, but may also cause major safety accidents such as explosions and fires, endangering the lives and property of people. Traditional natural hydrogen detection is ground detection, that is, after the underground well or tunnel is drilled, the wellhead is sealed, and the gas from the underground is collected at the wellhead. The natural hydrogen content in the collected gas is then tested to make an overall judgment on the natural hydrogen content underground or in the well. This method cannot accurately determine the natural hydrogen content at a specific depth or specific location underground. If the natural hydrogen content detected on the ground is high, the specific location of the leak underground cannot be determined. Summary of the Invention

[0003] To address the above-mentioned problems, the present invention provides a downhole positioning and detection device for natural hydrogen. The device comprises, from top to bottom, an upper positioning assembly, an upper support plate, a motor, a first driver, a lower support plate, and a lower positioning assembly. The motor is connected to the top of the first driver to drive the first driver to rotate. The side of the first driver is connected to several detection boxes on the lower support plate, which are used to push the detection boxes to the downhole sidewall. The detection boxes are equipped with hydrogen detectors for detecting natural hydrogen released from the well sidewall. The lower positioning assembly includes a second driver and several retractable lower positioning rods. The several lower positioning rods point to different directions in the well. When the lower positioning rods are extended, they abut against the side wall of the well, serving as the lower guide rail of the detection box and fixing the lower support plate and the upper support plate. The upper positioning assembly includes a third driver and several retractable upper positioning rods. The upper positioning rods correspond to the lower positioning rods one by one. When the upper positioning rods are extended, they rest against the side wall of the well and serve as the upper guide rails of the detection box.

[0004] Optionally, a hollow vertical connecting pipe is connected to the middle of the upper surface of the upper support plate, the driver three is arranged inside the connecting pipe, and the top of the connecting pipe is detachably connected to a continuous pipe fitting, which lowers the downhole positioning and detection device for natural hydrogen along the vertical well to the depth required for detection.

[0005] Further optionally, the bottom end of the connecting tube is connected to the center of the upper support plate, the bottom of the driver three is installed on the upper surface of the upper support plate, the side of the connecting tube is provided with several through holes, the side of the driver three is connected to several upper positioning rods, and the upper positioning rods pass through the corresponding through holes.

[0006] Optionally, the upper support disk is parallel to the lower support disk, and both are circular. The diameter of the upper support disk is smaller than that of the lower support disk. The connecting pipe, the upper support disk, the first driver and the lower support disk are concentrically arranged. Two connecting rods are connected between the upper support disk and the lower support disk; The top of the motor is installed at the center of the lower surface of the upper support disk. The rotating shaft of the motor is connected downward to the first driver, and the bottom of the first driver is rotatably connected to the center of the lower support disk, so that the motor drives the first driver to rotate; The second driver is installed at the center of the lower surface of the lower support disk. The side of the second driver is connected with a plurality of lower positioning rods, and the plurality of lower positioning rods are uniformly arranged along the circumference of the lower support disk.

[0007] Further optionally, two telescopic rods are provided on the side of the first driver, and the two telescopic rods are symmetrically arranged left and right with the first driver as the center. The telescopic rods are connected to the detection box. The first driver controls the detection box to move along the radial direction of the lower support disk by controlling the telescopic movement of the telescopic rods. The motor controls the detection box to move along the circumferential direction of the lower support disk through the first driver.

[0008] Further optionally, the lower positioning rods are horizontally arranged, and the whole is in the shape of a slender flat plate, divided into several sections. The upper surface of each section is a flat plate, which is convenient for supporting and guiding the detection box to move along the lower positioning rods. The lower positioning rods are in a conventional telescopic form. A rubber pad is provided at one end of the lower positioning rod pointing to the inner wall of the well. When this end of the lower positioning rod abuts against the inner wall of the well, the friction and stability of the lower positioning rod are improved, and at the same time, the lower positioning rod is protected.

[0009] Further optionally, the upper positioning rods are horizontally arranged, and the whole is in the shape of a slender flat plate, divided into several sections. The upper surface of each section is a flat plate, which is convenient for supporting and guiding the detection box to move along the upper positioning rods. The upper positioning rods are in a conventional telescopic form. The corresponding upper positioning rods and lower positioning rods are in the same vertical plane, forming upper and lower guide rails to guide the detection box to move towards the inner wall of the well. A rubber pad is provided at one end of the upper positioning rod pointing to the inner wall of the well. When this end of the upper positioning rod abuts against the inner wall of the well, the friction and stability of the upper positioning rod are improved, and at the same time, the upper positioning rod is protected.

[0010] Further optionally, the upper surface of the rubber pad at one end of the lower positioning rod is wedge-shaped, and the end of the rubber pad pointing to the lower support disk is lower than the end of the rubber pad pointing to the inner wall of the well.

[0011] Optionally, the inside of the detection box is hollow, and a hydrogen detector is provided inside. The detection port of the hydrogen detector faces the inner wall of the well. An air vent and a connecting ring are provided at the top of the detection box. The air vent is connected to an air pump and a nitrogen cylinder on the ground through a gas path. After the upper positioning rod extends, it can pass through the connecting ring to realize the sliding connection between the detection box and the upper positioning rod; The side of the detection box facing the well inner wall is open, capable of receiving the gas released from the formation of the well inner wall; a circle of hydraulic capsules is arranged on the side of the detection box facing the well inner wall, and the hydraulic capsules are connected to a liquid supply device on the ground through pipelines. After filling the hydraulic capsules with liquid, the gap between the detection box and the well inner wall is sealed. Two rows of ball bearings are arranged at the bottom of the detection box to facilitate the movement of the detection box on the lower support plate; a row of rollers is arranged between the two rows of ball bearings to facilitate the movement of the detection box on the lower positioning rod.

[0012] Further optionally, the bottom surface of the detection box is provided with a frustum-shaped fixing part, which is large at the top and small at the bottom and hollow inside. Part of the ball bearings are inside the fixing part and the other part are outside the fixing part, and they can roll on the lower support plate; when the detection box moves on the lower positioning rod, the two rows of ball bearings are respectively on both sides of the lower positioning rod and are suspended, and the fixing part can hold the ball bearings to prevent them from falling off.

[0013] Further optionally, the rollers are higher than the ball bearings. When the detection box moves on the lower positioning rod, a row of rollers slides on the lower positioning rod.

[0014] Further optionally, the height of the lower part of the internal space of the connecting ring corresponds to the height of the upper positioning rod, so that the upper positioning rod can be inserted into the connecting ring. The height of the upper part of the internal space of the connecting ring is higher than the upper positioning rod, that is, after the upper positioning rod is inserted into the connecting ring, there is still some space inside the connecting ring.

[0015] Further optionally, a circle of rubber pads is arranged on the side of the hydraulic capsule facing the well inner wall. The liquid supply device on the ground inputs hydraulic oil or water into the hydraulic capsule, and the hydraulic capsule bulges and fills the space between the detection box and the well inner wall. Together with the driving force of the telescopic rod, the detection box is sealed. The rubber pads protect the hydraulic capsule from being punctured by sharp rocks in the formation, and at the same time improve the sealing performance of the hydraulic capsule. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a device for detecting and positioning natural hydrogen underground; Figure 2 It is Figure 1 a three-dimensional schematic diagram; Figure 3 It is a top view schematic diagram of the lower support plate; Figure 4 It is a three-dimensional schematic diagram of the detection box; Figure 5 It is a bottom view schematic diagram of the detection box; Figure 6 It is a schematic diagram of the detection box moving along the lower positioning rod and the upper positioning rod.

[0017] In the attached drawings, 1 is the upper support plate, 2 is the motor, 3 is the first driver, 4 is the lower support plate, 5 is the second driver, 6 is the third driver, 7 is the detection box, 8 is the hydrogen detector, 9 is the lower positioning rod, 10 is the upper positioning rod, 11 is the connecting pipe, 12 is the connecting rod, 13 is the telescopic rod, 14 is the rubber pad, 15 is the ventilation port, 16 is the connecting ring, 17 is the hydraulic bladder, 18 is the ball, 19 is the roller, and 20 is the fixing part. Detailed implementation mode

[0018] This embodiment provides a device for underground positioning and detecting natural hydrogen, as Figures 1-6 shown. From top to bottom, it includes an upper positioning component, an upper support plate 1, a motor 2, a first driver 3, a lower support plate 4, and a lower positioning component. The motor 2 is connected to the top of the first driver 3 and drives the first driver 3 to rotate. The side of the first driver 3 is connected to several detection boxes 7 on the lower support plate 4, which are used to push the detection boxes 7 to the side wall of the well. The detection box 7 is equipped with a hydrogen detector 8, which is used to detect the natural hydrogen released from the side wall of the well. The lower positioning component includes a second driver 5 and several telescopic lower positioning rods 9. The several lower positioning rods 9 point to different directions in the well respectively. After the lower positioning rods 9 are extended, they abut against the side wall of the well, serving as the lower guide rails of the detection box 7, and at the same time fixing the lower support plate 4 and the upper support plate 1. The upper positioning component includes a third driver 6 and several telescopic upper positioning rods 10. The upper positioning rods 10 correspond to the lower positioning rods 9 one by one. After the upper positioning rods 10 are extended, they abut against the side wall of the well, serving as the upper guide rails of the detection box 7.

[0019] Optionally, the middle of the upper surface of the upper support plate 1 is connected to a section of hollow vertical connecting pipe 11. The third driver 6 is arranged inside the connecting pipe 11. The top of the connecting pipe 11 is detachably connected to a continuous pipe fitting. The continuous pipe fitting lowers the device for underground positioning and detecting natural hydrogen along the vertical well to the depth to be detected.

[0020] The continuous pipe fitting is a conventional device. For example, the connecting pipe 11 is connected to the bottom of the continuous pipe fitting at the bottom. Sections of continuous pipe fittings are connected end to end and continuously lowered into the well from the ground wellhead. The vertical well is basically vertical and in a barehole state. The inner wall of the well is the formation solid wall surface. The natural hydrogen at that place in the formation can diffuse out from the inner wall of the well and be detected by the hydrogen detector 8 in the detection box 7. The continuous pipe fitting leads the device for underground positioning and detecting natural hydrogen along the vertical well to the depth to be detected. According to the depth to be detected, the number of sections of the continuous pipe fitting is reasonably set. The device of the present invention can be lowered to any depth in the vertical well, facilitating flexible selection of the detection position and comprehensively and precisely grasping the situation of natural hydrogen at various places in the well.

[0021] Further optionally, the bottom end of the connecting pipe 11 is connected to the center of the upper support plate 1, the bottom of the third driver 6 is installed on the upper surface of the upper support plate 1, several through holes are provided on the side surface of the connecting pipe 11, several upper positioning rods 10 are connected to the side surface of the third driver 6, and the upper positioning rods 10 pass through the corresponding through holes.

[0022] Optionally, the upper support plate 1 is parallel to the lower support plate 4, and both are circular. The diameter of the upper support plate 1 is smaller than the diameter of the lower support plate 4. The connecting pipe 11, the upper support plate 1, the first driver 3 and the lower support plate 4 are concentrically arranged; two connecting rods 12 are connected between the upper support plate 1 and the lower support plate 4, and the two connecting rods 12 are symmetrically arranged left and right with the first driver 3 as the center, connecting the upper support plate 1 and the lower support plate 4 together; The top of the motor 2 is installed at the center of the lower surface of the upper support plate 1. The rotating shaft of the motor 2 is connected downward to the first driver 3. The bottom of the first driver 3 is rotatably connected to the center of the lower support plate 4, so that the motor 2 drives the first driver 3 to rotate; The second driver 5 is installed at the center of the lower surface of the lower support plate 4. Several lower positioning rods 9 are connected to the side surface of the second driver 5, and the several lower positioning rods 9 are uniformly arranged along the circumference of the lower support plate 4.

[0023] Further optionally, two telescopic rods 13 are provided on the side surface of the first driver 3, and the two telescopic rods 13 are symmetrically arranged left and right with the first driver 3 as the center. The telescopic rods 13 are connected to the detection box 7; the first driver 3 controls the telescopic movement of the telescopic rods 13 to control the radial movement of the detection box 7 along the lower support plate 4; the motor 2 controls the circumferential movement of the detection box 7 along the lower support plate 4 through the first driver 3.

[0024] As a specific implementation manner, the bottom of the first driver 3 is installed on the chassis, and the chassis is rotatably connected to the lower support plate 4 to improve the stability of the first driver 3; the two connecting rods 12 are vertical and are located at the position close to the edge of the upper support plate; since the two connecting rods 12 divide the space between the upper support plate 1 and the lower support plate 4 into two parts, the telescopic rods 13 cannot cross the connecting rods 12, so that the detection box 7 can only rotate 180° between the two connecting rods 12 where it is located. The two detection boxes 7 can cover the 360° area of the cross-section of the underground well, and complete the natural hydrogen detection of the well side wall in any direction at the same height underground.

[0025] Further optionally, the lower positioning rod 9 is horizontally arranged and is an overall slender flat plate shape, which is divided into several sections. The upper surface of each section is a flat plate, which is convenient for supporting and guiding the detection box 7 to move along the lower positioning rod 9. The lower positioning rod 9 is in a conventional telescopic form; a rubber pad 14 is provided at the end of the lower positioning rod 9 pointing to the inner wall of the well. When this end of the lower positioning rod 9 abuts against the inner wall of the well, the friction and stability of the lower positioning rod 9 are improved, and at the same time, the lower positioning rod 9 is protected.

[0026] Because the lower positioning assembly is fixed relative to the lower support plate 4, each time the continuous tubing is inserted into the well, the lower positioning rod 9 can only point in a few fixed directions, so the detection box 7 can only detect the well wall in the direction pointed by the lower positioning rod 9. Before the continuous tubing is sent into the well again, the two support plates can be rotated in advance to change the detection angle.

[0027] When the entire device follows the continuous pipe to the specified detection depth, driver 2 5 pushes all lower positioning rods 9 to extend synchronously with the inner wall of the well and press against the inner wall of the well, thereby temporarily fixing the position of the two support plates to facilitate the subsequent operation of motor 2 and driver 1 3.

[0028] Further optionally, the upper positioning rod 10 is arranged horizontally, and the whole is in the shape of a slender flat plate, divided into several sections, the upper surface of each section is in the shape of a flat plate, which is convenient for supporting and guiding the detection box 7 to move along the upper positioning rod 10, and the upper positioning rod 10 is a conventional retractable form; the corresponding upper positioning rod 10 and lower positioning rod 9 are on the same vertical plane, forming upper and lower guide rails to guide the detection box 7 to move toward the inner wall of the well; a rubber pad is provided at one end of the upper positioning rod 10 pointing to the inner wall of the well, and when this end of the upper positioning rod 10 is against the inner wall of the well, the friction and stability of the upper positioning rod 10 are increased, while protecting the upper positioning rod 10.

[0029] The control circuits and wires of the motor 2 and the three drivers are bundled together, extended along the outer side of the continuous pipe to the ground, and then connected to the corresponding control devices and power supplies on the ground.

[0030] Optionally, the interior of the detection box 7 is hollow, and a conventional portable or small hydrogen detector 8 is provided therein, with the detection port of the hydrogen detector 8 facing the inner wall of the well; a vent 15 and a connecting ring 16 are provided on the top of the detection box 7, and the vent 15 is connected to the air pump and the nitrogen cylinder on the ground through an air path, and the upper positioning rod 10 can pass through the connecting ring 16 after being extended, thereby realizing a sliding connection between the detection box 7 and the upper positioning rod 10; The side of the detection box 7 facing the inner wall of the well is open and can receive gas released from the formation on the inner wall of the well. A circle of hydraulic bladders 17 are provided on the side of the detection box 7 facing the inner wall of the well. The hydraulic bladders 17 are connected to the liquid supply device on the ground through pipelines. After the hydraulic bladders 17 are filled with liquid, the gap between the detection box 7 and the inner wall of the well is sealed. Two rows of balls 18 are provided at the bottom of the detection box 7 to facilitate the movement of the detection box 7 on the lower support plate 4; a row of rollers 19 is provided between the two rows of balls 18 to facilitate the movement of the detection box 7 on the lower positioning rod 9.

[0031] Further optionally, the detection box 7 is a cube with an open front side, a rear side connected to the driver 3 via a telescopic rod 13, and left and right sides closed. The top and bottom surfaces are both horizontal, which facilitates sliding connection of the upper and lower positioning rods 9.

[0032] Further optionally, the bottom surface of the detection box 7 is provided with an inverted frustum-shaped fixing portion 20, which is larger at the top and smaller at the bottom and is hollow inside. Part of the ball 18 is inside the fixing portion 20, and the other part is outside the fixing portion 20, and can roll on the lower support plate 4; when the detection box 7 moves on the lower positioning rod 9, the two rows of balls 18 are respectively on both sides of the lower positioning rod 9 and are suspended in the air, and the fixing portion 20 can clamp the balls 18 and prevent them from falling.

[0033] Further optionally, the rollers 19 are higher than the balls 18 , and when the detection box 7 moves on the lower positioning rod 9 , a row of rollers 19 slides on the lower positioning rod 9 .

[0034] Further optionally, the height of the lower part of the internal space of the connecting ring 16 corresponds to the height of the upper positioning rod 10, so that the upper positioning rod 10 can be inserted into the connecting ring 16, and the height of the upper part of the internal space of the connecting ring 16 is higher than the upper positioning rod 10, that is, after the upper positioning rod 10 is inserted into the connecting ring 16, there is still some space in the connecting ring 16.

[0035] Further optionally, a circle of rubber pads is provided on the side of the hydraulic bag 17 facing the inner wall of the well. The liquid supply device on the ground inputs hydraulic oil or water to the hydraulic bag 17. The hydraulic bag 17 swells and fills the space between the detection box 7 and the inner wall of the well. The pushing force of the telescopic rod 13 is then used to seal the detection box 7. The rubber pads protect the hydraulic bag 17, prevent the hydraulic bag 17 from being punctured by sharp rocks in the formation, and improve the sealing of the hydraulic bag 17.

[0036] During use, the initial positions of the two detection boxes 7 connected by driver 1 (3) are known. For example, the detection boxes 7 are close to a connecting rod 12, which serves as the initial position. After the lower positioning rod 9 fixes the position of the two support plates, the motor 2 drives the detection boxes 7 through driver 1 (3) to rotate to the direction required for detection, which corresponds to an upper positioning rod 10 and a lower positioning rod 9. Driver 3 (3) pushes all upper positioning rods 10 to extend. After passing through the corresponding connecting rings 16, the upper positioning rods 10 extend to the inner wall of the well and press against the inner wall of the well. The telescopic rod 13 of driver 1 (3) extends, simultaneously pushing the two detection boxes 7 away from each other in opposite directions.

[0037] Taking a detection box 7 as an example, since the lower support plate 4 has a certain thickness, the upper surface of the lower positioning rod 9 is basically flush with the lower surface of the lower support plate 4. When the detection box 7 moves to the lower positioning rod 9, the whole box will drop by a certain distance, approximately the thickness of the lower support plate 4. There is a vertical through groove at the position where the rear side of the detection box 7 is connected to the telescopic rod 13. When the detection box 7 is on the lower support plate 4, the telescopic rod 13 is connected to the bottom of the through groove. When the detection box 7 is on the lower positioning rod 9, the telescopic rod 13 is connected to the top of the through groove. The rollers 19 at the bottom of the detection box 7 roll on the lower positioning rod 9. Corresponding to the drop of the detection box 7, the connecting ring 16 also drops. The internal space of the connecting ring 16 is relatively high, leaving space for the upper positioning rod 10. That is, when the detection box 7 is on the lower positioning rod 9, the upper surface of the upper positioning rod 10 contacts the top of the connecting ring 16. Thus, the detection box 7 is slidably connected to the upper positioning rod 10 and the lower positioning rod 9 up and down, and the telescopic rod 13 pushes the detection box 7 to move along the upper and lower positioning rods 9 to the inner wall of the well.

[0038] When the detection box 7 approaches the inner wall of the well (but not sealed), the nitrogen cylinder fills the detection box 7 with nitrogen to displace the original air in the detection box 7. After the displacement is completed, after the detection box 7 is hermetically docked with the inner wall of the well in the above manner, the air in the detection box 7 is pumped out with a vacuum pump to extract the nitrogen, and at the same time, it also promotes the release of the gas in the formation inside the inner wall of the well, which is thus detected by the hydrogen detector 8. The nitrogen in the detection box 7 is first pumped out. According to the volume of the detection box 7, the pressure at this depth underground, and the flow rate shown by the gas flow meter connected to the vacuum pump, the time when the nitrogen in the detection box 7 is basically pumped out can be calculated. According to this time, the vacuum pump is stopped. The gas in the formation continues to diffuse into the detection box 7. The hydrogen detector 8 is connected to the data analysis device on the ground for analyzing the content of natural hydrogen in the formation at this depth. Two detection boxes 7 simultaneously detect the relative positions of the formation at the same depth.

[0039] Then, the liquid in the hydraulic bladder 17 is pumped out, the detection box 7 is hermetically sealed, and the driver 1 3 pulls the detection box 7 back to the edge of the lower support plate 4. The upper and lower positioning rods 9 contract and reset. The upper surface of the rubber pad 14 at one end of the lower positioning rod 9 is wedge-shaped, with the end pointing to the lower support plate 4 being lower and the end pointing to the inner wall of the well being higher. During the contraction of the lower positioning rod 9, it is equivalent to the rollers 19 of the detection box 7 moving along this wedge-shaped rubber pad, which can lift the height of the detection box 7, so that the telescopic rod 13 is connected to the bottom of the through groove again, and the balls 18 rise back to the height of the upper surface of the lower support plate. The telescopic rod 13 can pull the detection box 7 back to its original position, facilitating the rotation of the detection box 7 to the next detection direction. Repeat the above operations to detect the natural hydrogen in different positions of the formation at the same depth on the inner wall of the well again. Finally, all the detection data can be averaged to obtain the content of natural hydrogen in the formation at this depth. Then, the whole device is lowered to other depths in the well for detection.

Claims

1. An underground positioning and detecting device for natural hydrogen, characterized in that From top to bottom, it includes an upper positioning component, an upper support disk, a motor, a first driver, a lower support disk, and a lower positioning component. The motor is connected to the top of the first driver and drives the first driver to rotate. The side of the first driver is connected to several detection boxes on the lower support disk, which are used to push the detection boxes to the side wall of the well. The detection boxes are equipped with hydrogen detectors to detect the natural hydrogen released from the side wall of the well. The lower positioning component includes a second driver and several telescopic lower positioning rods. The several lower positioning rods point to different directions inside the well respectively. After the lower positioning rods extend, they abut against the side wall of the well, serving as the lower guide rails of the detection boxes, and at the same time fixing the lower support disk and the upper support disk. The upper positioning component includes a third driver and several telescopic upper positioning rods. The upper positioning rods correspond to the lower positioning rods one by one. After the upper positioning rods extend, they abut against the side wall of the well, serving as the upper guide rails of the detection boxes.

2. The device for downhole positioning and detecting natural hydrogen according to claim 1, characterized in that, In the middle of the upper surface of the upper support disk, a hollow vertical connecting pipe is connected. The third driver is arranged inside the connecting pipe. The top of the connecting pipe is detachably connected to a continuous pipe fitting, and the continuous pipe fitting lowers the device for detecting natural hydrogen in the well to the depth to be detected along the straight well. The bottom of the third driver is installed on the upper surface of the upper support disk. Several through holes are provided on the side of the connecting pipe. The side of the third driver is connected to several upper positioning rods, and the upper positioning rods pass through the corresponding through holes.

3. The device for downhole positioning and detecting natural hydrogen according to claim 1, characterized in that, The upper support disk is parallel to the lower support disk, and both are circular. The diameter of the upper support disk is smaller than that of the lower support disk, and the upper support disk and the lower support disk are concentrically arranged. Two connecting rods are connected between the upper support disk and the lower support disk. The top of the motor is installed at the center of the lower surface of the upper support disk. The rotating shaft of the motor is connected downward to the first driver, and the bottom of the first driver is rotatably connected to the center of the lower support disk, so that the motor drives the first driver to rotate. The second driver is installed at the center of the lower surface of the lower support disk. The side of the second driver is connected to several lower positioning rods, and the several lower positioning rods are evenly arranged along the circumference of the lower support disk.

4. The device for downhole positioning and detecting natural hydrogen according to claim 3, characterized in that, Two telescopic rods are provided on the side of the first driver. The two telescopic rods are symmetrically arranged left and right with the first driver as the center. The telescopic rods are connected to the detection box. The first driver controls the telescopic rods to expand and contract to control the detection box to move radially along the lower support disk. The motor controls the detection box to move circumferentially along the lower support disk through the first driver.

5. The device for underground positioning and detecting natural hydrogen according to claim 1, wherein Both the lower positioning rods and the upper positioning rods are horizontally arranged and are overall slender flat plate-shaped, divided into several sections. The upper surface of each section is a flat plate, which is convenient for supporting and guiding the detection box to move along the lower positioning rod or the upper positioning rod. Both the lower positioning rods and the upper positioning rods are in a telescopic form. Rubber pads are provided at the ends of the lower positioning rods and the upper positioning rods pointing to the inner wall of the well. The corresponding upper positioning rods and lower positioning rods are in the same vertical plane, forming upper and lower guide rails to guide the detection box to move towards the inner wall of the well.

6. The device for underground positioning and detecting natural hydrogen according to claim 1, characterized in that, The inside of the detection box is hollow and is equipped with a hydrogen detector. The detection port of the hydrogen detector faces the inner wall of the well. An air vent and a connecting ring are provided at the top of the detection box. The air vent is connected to an air extraction pump and a nitrogen cylinder on the ground through an air path. After the upper positioning rod extends, it can pass through the connecting ring. The side of the detection box facing the inner wall of the well is open, capable of receiving the gas released from the formation of the inner wall of the well; a circle of hydraulic capsules is arranged on the side of the detection box facing the inner wall of the well, and the hydraulic capsules are connected to the liquid supply device on the ground through pipelines. After filling the hydraulic capsules with liquid, the gap between the detection box and the inner wall of the well is sealed. Two rows of balls are arranged at the bottom of the detection box to facilitate the movement of the detection box on the lower support plate; a row of rollers is arranged between the two rows of balls to facilitate the movement of the detection box on the lower positioning rod.

7. The device for downhole positioning and detecting natural hydrogen according to claim 6, characterized in that, A circle of rubber pads is arranged on the side of the hydraulic capsule facing the inner wall of the well. The liquid supply device on the ground inputs hydraulic oil or water into the hydraulic capsule, and the hydraulic capsule bulges, and the rubber pads protect the hydraulic capsule.

8. The device for downhole positioning and detecting natural hydrogen according to claim 6, wherein, The bottom surface of the detection box is provided with a frustum-shaped fixing part, which is large at the top and small at the bottom and hollow inside. Part of the balls are inside the fixing part and part are outside the fixing part, and can roll on the lower support plate; when the detection box moves on the lower positioning rod, the two rows of balls are respectively on both sides of the lower positioning rod and are suspended, and the fixing part can hold the balls so that they do not fall off. The rollers are higher than the balls. When the detection box moves on the lower positioning rod, a row of rollers slides on the lower positioning rod.

9. The device for downhole positioning and detecting natural hydrogen according to claim 6, characterized in that, The height of the lower part of the internal space of the connecting ring corresponds to the height of the upper positioning rod, so that the upper positioning rod can be inserted into the connecting ring. The height of the upper part of the internal space of the connecting ring is higher than the upper positioning rod, that is, after the upper positioning rod is inserted into the connecting ring, there is still some space inside the connecting ring.

10. The device for downhole positioning and detecting natural hydrogen according to claim 5, characterized in that, The upper surface of the rubber pad at one end of the lower positioning rod is wedge-shaped, and the end of the rubber pad pointing to the lower support plate is lower than the end of the rubber pad pointing to the inner wall of the well.

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