A device for downhole positioning and detection of natural hydrogen

Abstract

The present invention relates to a device for positioning and detecting natural hydrogen in a well. 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 side wall of the well. The detection boxes are equipped with hydrogen detectors for detecting natural hydrogen released from the side wall of the well. The lower positioning assembly comprises a second driver and several retractable lower positioning rods. The several lower positioning rods point to different directions in the well respectively. When the lower positioning rods are extended, they abut against the side wall of the well, serving as lower guide rails of the detection box and fixing the lower support plate and the upper support plate at the same time. The upper positioning assembly comprises 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 abut against the side wall of the well, serving 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.

[0004] 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.

[0005] 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.

[0006] 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.

[0007] 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.

[0008] Optionally, the upper support plate is parallel to the lower support plate and both are circular, the diameter of the upper support plate is smaller than the diameter of the lower support plate, the connecting pipe, the upper support plate, the driver and the lower support plate are arranged concentrically; two connecting rods are connected between the upper support plate and the lower support plate;

[0009] The top of the motor is installed at the center of the circle on the lower surface of the upper support plate, the rotating shaft of the motor is downwardly connected to the driver 1, and the bottom of the driver 1 is rotated and connected to the center of the circle of the lower support plate, so that the motor drives the driver 1 to rotate;

[0010] The second driver is installed at the center of the lower surface of the lower support plate. The side of the second driver is connected to a plurality of lower positioning rods, which are evenly arranged along the circumference of the lower support plate.

[0011] Further optionally, two telescopic rods are provided on the side of the driver one, and the two telescopic rods are symmetrically arranged on the left and right with the driver one as the center, and the telescopic rods are connected to the detection box; the driver one controls the radial movement of the detection box along the lower support plate by controlling the extension and retraction of the telescopic rods; the motor controls the circumferential movement of the detection box along the lower support plate through the driver one.

[0012] Further optionally, the lower positioning rod is arranged horizontally, and the whole is in the shape of a slender flat plate, which is 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 to move along the lower positioning rod. The lower positioning rod is a conventional retractable 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 is against the inner wall of the well, the friction and stability of the lower positioning rod are improved, and the lower positioning rod is protected at the same time.

[0013] Further optionally, the upper positioning rod 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 to move along the upper positioning rod, and the upper positioning rod is a conventional retractable form; the corresponding upper positioning rod and lower positioning rod are on the same vertical plane, forming upper and lower guide rails to guide the detection box to move toward the inner wall of the well; a rubber pad is provided at the end of the upper positioning rod pointing to the inner wall of the well, and when this end of the upper positioning rod is against the inner wall of the well, the friction and stability of the upper positioning rod are increased, while protecting the upper positioning rod.

[0014] 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 plate is lower than the end of the rubber pad pointing to the inner wall of the well.

[0015] Optionally, the interior of the detection box is hollow, and a hydrogen detector is provided therein, with the detection port of the hydrogen detector facing the inner wall of the well; a vent and a connecting ring are provided on the top of the detection box, the vent is connected to the air pump and the nitrogen cylinder on the ground through an air path, and the upper positioning rod can pass through the connecting ring after being extended to realize the sliding connection between the detection box and the upper positioning rod;

[0016] The side of the test box 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 bags is installed on the side of the test box facing the inner wall of the well. The hydraulic bags are connected to the liquid supply device on the ground through pipes. After the hydraulic bags are filled with liquid, the gap between the test box and the inner wall of the well is sealed.

[0017] There are two rows of ball bearings at the bottom of the test box to facilitate the movement of the test box on the lower support plate; a row of rollers is provided between the two rows of ball bearings to facilitate the movement of the test box on the lower positioning rod.

[0018] Further optionally, the bottom surface of the detection box is provided with an inverted frustum-shaped fixing portion, which is larger at the top and smaller at the bottom and is hollow inside. Part of the ball is inside the fixing portion, and the other part is outside the fixing portion, 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 in the air, and the fixing portion can clamp the balls and prevent them from falling.

[0019] Further optionally, the rollers are higher than the balls, and when the detection box moves on the lower positioning rod, a row of rollers slides on the lower positioning rod.

[0020] 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, and 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 in the connecting ring.

[0021] Further optionally, a circle of rubber pads is provided on the side of the hydraulic bag facing the inner wall of the well. The liquid supply device on the ground inputs hydraulic oil or water into the hydraulic bag. The hydraulic bag swells and fills the space between the detection box and the inner wall of the well. The pushing force of the telescopic rod is then used to seal the detection box. The rubber pads protect the hydraulic bag, prevent the hydraulic bag from being punctured by sharp rocks in the formation, and improve the sealing of the hydraulic bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the structure of a device for downhole positioning and detection of natural hydrogen;

[0023] Figure 2 for Figure 1 3D schematic diagram of

[0024] Figure 3 Schematic diagram of a top view of the lower support plate;

[0025] Figure 4 is a three-dimensional schematic diagram of the detection box;

[0026] Figure 5 Schematic diagram of the bottom of the detection box;

[0027] Figure 6Schematic diagram of the detection box moving along the lower positioning rod and the upper positioning rod.

[0028] In the accompanying drawings, 1-upper support plate, 2-motor, 3-driver one, 4-lower support plate, 5-driver two, 6-driver three, 7-detection box, 8-hydrogen detector, 9-lower positioning rod, 10-upper positioning rod, 11-connecting pipe, 12-connecting rod, 13-telescopic rod, 14-rubber pad, 15-vent, 16-connecting ring, 17-hydraulic bag, 18-ball, 19-roller, 20-fixing part. DETAILED DESCRIPTION

[0029] This embodiment provides a device for downhole positioning and detection of natural hydrogen, such as Figures 1-6 As shown, from top to bottom, it includes an upper positioning assembly, an upper support plate 1, a motor 2, a driver 3, a lower support plate 4, and a lower positioning assembly. The motor 2 is connected to the top of the driver 3 to drive the driver 3 to rotate. The side of the 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 boxes 7 are equipped with hydrogen detectors 8 for detecting natural hydrogen released from the side wall of the well.

[0030] The lower positioning assembly includes a second driver 5 and a plurality of retractable lower positioning rods 9. The plurality of lower positioning rods 9 point to different directions in the well. When the lower positioning rods 9 are extended, they abut against the side wall of the well, serving as the lower guide rail of the detection box 7 and fixing the lower support plate 4 and the upper support plate 1.

[0031] The upper positioning assembly includes a driver 3 6 and several retractable upper positioning rods 10. The upper positioning rods 10 correspond one to one with the lower positioning rods 9. After the upper positioning rods 10 are extended, they rest against the side wall of the well and serve as the upper guide rail of the detection box 7.

[0032] Optionally, a hollow vertical connecting pipe 11 is connected to the middle of the upper surface of the upper support plate 1, the driver 3 6 is arranged inside the connecting pipe 11, and the top of the connecting pipe 11 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.

[0033] The continuous pipe is a conventional device. For example, the connecting pipe 11 is connected to the bottom of the bottommost continuous pipe. The continuous pipe is connected end to end and is continuously lowered from the wellhead on the ground into the well. The vertical well is basically vertical and is in an open hole state. The inner wall of the well is the solid wall of the formation. Natural hydrogen in this part of the formation can diffuse from the inner wall of the well and be detected by the hydrogen detector 8 in the detection box 7. The continuous pipe leads the device for downhole positioning and detecting natural hydrogen to be lowered along the vertical well to the depth required for detection. The number of sections of the continuous pipe is reasonably set according to the depth required for detection. The device of the present invention can be lowered to any depth in the vertical well, facilitating the flexible selection of detection locations and comprehensively and meticulously understanding the natural hydrogen situation at various locations downhole.

[0034] Further optionally, the bottom end of the connecting tube 11 is connected to the center of the upper support plate 1, the bottom of the driver three 6 is installed on the upper surface of the upper support plate 1, the side of the connecting tube 11 is provided with several through holes, the side of the driver three 6 is connected to several upper positioning rods 10, and the upper positioning rods 10 pass through the corresponding through holes.

[0035] 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 that of the lower support plate 4. The connecting pipe 11, the upper support plate 1, the 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. The two connecting rods 12 are symmetrically arranged with the driver 3 as the center, connecting the upper support plate 1 and the lower support plate 4 together.

[0036] 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 downwardly connected to the driver 1 3. The bottom of the driver 1 3 is rotated and connected to the center of the lower support plate 4, so that the motor 2 drives the driver 1 3 to rotate.

[0037] The second driver 5 is installed at the center of the lower surface of the lower support plate 4 . The side of the second driver 5 is connected to a plurality of lower positioning rods 9 . The plurality of lower positioning rods 9 are evenly arranged along the circumference of the lower support plate 4 .

[0038] Further optionally, two telescopic rods 13 are provided on the side of the driver 3, and the two telescopic rods 13 are symmetrically arranged with the driver 3 as the center, and the telescopic rods 13 are connected to the detection box 7; the driver 3 controls the radial movement of the detection box 7 along the lower support plate 4 by controlling the extension and contraction of the telescopic rods 13; the motor 2 controls the circumferential movement of the detection box 7 along the lower support plate 4 through the driver 3.

[0039] As a specific implementation method, the bottom of the driver 3 is installed on the chassis, and the chassis is rotated to connect to the lower support plate 4 to improve the stability of the driver 3; the two connecting rods 12 are vertical and close to the edge of the upper support plate; because 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 rod 13 cannot cross the connecting rod 12, so that the detection box 7 can only rotate 180° between the two connecting rods 12. The two detection boxes 7 can cover a 360° area of ​​the underground cross-section and complete the natural hydrogen detection of the well side wall in any direction at the same height underground.

[0040] Further optionally, the lower positioning rod 9 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 lower positioning rod 9, and the lower positioning rod 9 is a conventional retractable form; a rubber pad 14 is provided at one end of the lower positioning rod 9 pointing to the inner wall of the well. When this end of the lower positioning rod 9 is against the inner wall of the well, the friction and stability of the lower positioning rod 9 are improved, and the lower positioning rod 9 is protected at the same time.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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;

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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 .

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Taking an inspection 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 inspection box 7 moves to the lower positioning rod 9, the box will drop as a whole, about the thickness of the lower support plate 4. The position where the rear side of the inspection box 7 is connected to the telescopic rod 13 is provided with a vertical through groove. When the inspection box 7 is on the lower support plate 4, the telescopic rod 13 is connected to the bottom of the through groove. When the inspection box 7 is on the lower positioning rod 9, the telescopic rod 13 is connected to the top of the through groove, and the roller 19 at the bottom of the inspection box 7 rolls on the lower positioning rod 9; corresponding to the descent of the inspection box 7, the connecting ring 16 also drops, and the internal space of the connecting ring 16 is higher, reserving space for the upper positioning rod 10, that is, when the inspection 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. At this point, the upward and downward sliding of the detection box 7 connects the upper positioning rod 10 and the lower positioning rod 9, 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.

[0055] When detection box 7 is close to the wellbore (but not sealed), nitrogen is pumped into the detection box 7 from a nitrogen cylinder to displace any air previously contained within. Once the displacement is complete, the detection box 7 is sealed and docked with the wellbore as described above. A vacuum pump is then used to pump out the nitrogen, simultaneously releasing gas from the formation within the wellbore, where it is detected by hydrogen detector 8. The nitrogen in detection box 7 is initially pumped out. Based on the volume of detection box 7, the pressure at the specified depth, and the flow rate displayed by the gas flowmeter connected to the vacuum pump, the time it takes for the nitrogen in detection box 7 to be substantially exhausted can be calculated. Based on this time, the vacuum pump is stopped. Gas from the formation continues to diffuse into detection box 7. Hydrogen detector 8 is connected to a surface data analysis device to analyze the natural hydrogen content of the formation at that depth. Two detection boxes 7 simultaneously monitor the relative positions of formations at the same depth.

[0056] Then, the liquid in the hydraulic bladder 17 is pumped out, and the test box 7 contacts the seal. Driver 13 pulls the test box 7 back to the edge of the lower support plate 4, and the upper and lower positioning rods 9 retract 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 toward the lower support plate 4 lower and the end pointing toward the wellbore wall higher. As the lower positioning rod 9 retracts, the roller 19, which acts as the test box 7, moves along the wedge-shaped rubber pad, raising the height of the test box 7, allowing the telescopic rod 13 to reconnect to the bottom of the through slot. The ball bearing 18 returns to the height of the upper surface of the lower support plate. The telescopic rod 13 pulls the test box 7 back to its original position, facilitating rotation of the test box 7 to the next testing direction. The above operation is repeated, and natural hydrogen is detected again at different locations at the same depth on the wellbore wall. Finally, all the test data can be averaged to obtain the natural hydrogen content of the formation at that depth. The entire device is then lowered to another depth in the well for testing.

Claims

1. A device for downhole positioning and detection of natural hydrogen, characterized in that: From top to bottom, it includes an upper positioning assembly, an upper support plate, a motor, a driver 1, a lower support plate, and a lower positioning assembly. The motor is connected to the top of the driver 1 to drive the driver 1 to rotate. The side of the driver 1 is connected to several detection boxes on the lower support plate, which are used to push the detection boxes to the sidewall of the well. The detection boxes are equipped with hydrogen detectors for detecting natural hydrogen released from the sidewall of the well. 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 abut against the side wall of the well and serve as the upper guide rails of the detection box. Two telescopic rods are provided on the side of the driver 1, and the two telescopic rods are symmetrically arranged with the driver 1 as the center, and the telescopic rods are connected to the detection box; the driver 1 controls the detection box to move radially along the lower support plate by controlling the extension and contraction of the telescopic rods; the motor controls the detection box to move circumferentially along the lower support plate through the driver 1; The detection port of the hydrogen detector faces the inner wall of the well; a connecting ring is provided on the top of the detection box, and the upper positioning rod can pass through the connecting ring after being extended; The side of the test box 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 bags is installed on the side of the test box facing the inner wall of the well. The hydraulic bags are connected to the liquid supply device on the ground through pipes. After the hydraulic bags are filled with liquid, the gap between the test box and the inner wall of the well is sealed. There are two rows of ball bearings at the bottom of the test box to facilitate the movement of the test box on the lower support plate; a row of rollers is provided between the two rows of ball bearings to facilitate the movement of the test box on the lower positioning rod.

2. The device for downhole positioning and detecting natural hydrogen according to claim 1, characterized in that: A hollow vertical connecting pipe is connected to the middle of the upper surface of the upper support plate. A third driver is provided inside the connecting pipe. The top of the connecting pipe is detachably connected to a continuous pipe. The continuous pipe lowers the downhole positioning and natural hydrogen detection device along the vertical well to the depth required for detection. The bottom of the driver three is installed on the upper surface of the upper support plate, and the side of the connecting pipe 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.

3. The device for downhole positioning and detecting natural hydrogen according to claim 1, characterized in that: The upper support plate is parallel to the lower support plate and both are circular. The diameter of the upper support plate is smaller than that of the lower support plate. The upper support plate and the lower support plate are concentrically arranged. Two connecting rods are connected between the upper support plate and the lower support plate. The top of the motor is installed at the center of the circle on the lower surface of the upper support plate, the rotating shaft of the motor is downwardly connected to the driver 1, and the bottom of the driver 1 is rotated and connected to the center of the circle of the lower support plate, so that the motor drives the driver 1 to rotate; The second driver is installed at the center of the lower surface of the lower support plate. The side of the second driver is connected to a plurality of lower positioning rods, which are evenly arranged along the circumference of the lower support plate.

4. The device for downhole positioning and detecting natural hydrogen according to claim 1, characterized in that: The lower positioning rod and the upper positioning rod are both arranged horizontally, and are both slender flat plates as a whole, divided into several sections, and 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. The lower positioning rod and the upper positioning rod are both retractable; the ends of the lower positioning rod and the upper positioning rod pointing to the inner wall of the well are provided with rubber pads; The corresponding upper positioning rod and lower positioning rod are on the same vertical plane, forming upper and lower guide rails to guide the detection box to move toward the inner wall of the well.

5. The device for downhole positioning and detecting natural hydrogen according to claim 1, characterized in that: The interior of the detection box is hollow and is provided with a hydrogen detector. A vent is provided on the top of the detection box, and the vent is connected to an air pump and a nitrogen bottle on the ground through an air path.

6. The device for downhole positioning and detecting natural hydrogen according to claim 1, characterized in that: A circle of rubber pad is provided on the side of the hydraulic bag facing the inner wall of the well. The hydraulic oil or water is input into the hydraulic bag by the liquid supply device on the ground, and the hydraulic bag bulges. The rubber pad protects the hydraulic bag.

7. The device for downhole positioning and detecting natural hydrogen according to claim 1, characterized in that: The bottom surface of the detection box is provided with an inverted truncated cone-shaped fixing portion, which is larger at the top and smaller at the bottom and is hollow inside. Part of the ball is located inside the fixing portion, and the other part is located outside the fixing portion, and can roll on the lower support plate; when the detection box moves on the lower positioning rod, the two rows of ball are located on both sides of the lower positioning rod and are suspended in the air, and the fixing portion can clamp the ball and prevent it from falling; The rollers are higher than the balls, and when the detection box moves on the lower positioning rod, a row of rollers slides on the lower positioning rod.

8. The device for downhole positioning and detecting natural hydrogen according to claim 1, 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 in the connecting ring.

9. The device for downhole positioning and detecting natural hydrogen according to claim 4, 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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