An unconventional natural gas reservoir development pre-frac evaluation apparatus

Abstract

The application discloses a pre-drainage evaluation device for unconventional natural gas reservoir exploitation, and relates to the technical field of unconventional natural gas reservoir evaluation.The device comprises a control module, an exploration module, a pre-drilling module, a pre-drainage module, a fracturing module and an evaluation module.The exploration module adopts remote sensing, sound waves and other means to make three-dimensional imaging of underground rock strata, so as to obtain the distribution and reserve estimation information of coal seams or shale gas.The pre-drilling module is used for drilling the exploration position.The pre-drainage module is used for supporting and reinforcing the inner wall of the drill hole and pre-draining the reservoir.The fracturing module is used for fracturing the underground rock strata.The evaluation module is used for analyzing the drainage gas and drainage pressure.

Description

An unconventional natural gas reservoir development pre-extraction assessment device Technical Field

[0001] This invention relates to the field of unconventional natural gas reservoir assessment technology, specifically to an unconventional natural gas reservoir development pre-extraction assessment device. Background Technology

[0002] Unconventional gas refers to natural gas that, for various reasons, cannot be extracted using conventional technologies and cannot be commercially exploited at a specific time. Unconventional gas can be converted into conventional gas at a certain stage. Currently, it mainly refers to natural gas stored in the form of coalbed methane, shale gas, dissolved gas, natural gas hydrates, inorganic gas, shallow biogenic gas, and tight sandstone gas. Because its formation and accumulation mechanisms differ from conventional natural gas, its development is more difficult and requires specialized technologies for extraction.

[0003] Currently, a pre-extraction assessment is required before exploiting unconventional natural gas reservoirs to determine the types and contents of various components in the reservoir and to determine the final extraction parameters. However, drilling and grouting are required during pre-extraction to reinforce the borehole walls, which makes the pre-extraction boreholes difficult to process later and affects the formal extraction work.

[0004] To address the above problems, this invention provides a pre-extraction assessment device for unconventional natural gas reservoir development, thereby solving the aforementioned issues. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pre-extraction assessment device for unconventional natural gas reservoir development, comprising:

[0006] Control module;

[0007] The exploration module uses a variety of methods, such as remote sensing and acoustic waves, to create three-dimensional images of underground rock strata in order to obtain information on the distribution and reserves of coal seams or shale gas.

[0008] Pre-drilling module, used for drilling holes at exploration locations;

[0009] The pre-extraction module is used to support and reinforce the borehole wall and to perform pre-extraction operations on the reservoir.

[0010] Fracturing modules are used for fracturing underground rock formations; and

[0011] The evaluation module is used to analyze the extracted gas and extraction pressure.

[0012] Further, preferably, the pre-sampling module includes:

[0013] The upper support component is fixed to the external lifting equipment;

[0014] The lower support assembly is connected to the upper support assembly via a connecting shaft;

[0015] Multiple support plates are configured and fixed between the upper support assembly and the lower support assembly, and multiple adjustment grooves are provided on their inner walls.

[0016] The pre-sampling assembly is configured in multiple parts and is hinged between the multiple support plates by means of an adjustment slot;

[0017] The extraction chamber is fixed to the lower end of the pre-extraction assembly and is connected to an external extraction pump via an extraction pipe; and

[0018] The extraction head is fixed to the outer wall of the pre-extraction component and connected to the extraction chamber.

[0019] Furthermore, preferably, the upper support component and the lower support component have the same structure, both including:

[0020] Fixture;

[0021] Multiple adjusting rods are configured and slidably disposed within the fixed frame;

[0022] The support rod is fixed to the adjusting rod; and

[0023] Adjust the gear, which is rotated on the fixed frame.

[0024] Furthermore, preferably, one end face of the adjusting rod is fixed with an adjusting column, and the adjusting gear is provided with multiple limiting grooves, the multiple limiting grooves corresponding to the multiple adjusting columns.

[0025] Furthermore, preferably, the upper support assembly further includes a drive gear and a limiting post, wherein the drive gear is rotatably mounted on the fixed frame and meshes with the adjusting gear, the rotation shaft of the drive gear passes through the fixed frame and fixes the limiting post, and the limiting post is engaged with the output end of an external motor.

[0026] Further, preferably, the connecting shaft includes an inner shaft and an outer shaft, wherein the inner shaft is fixed between the two fixed brackets, the outer shaft is fixed between the two adjusting gears, and the inner shaft and the outer shaft are rotatably connected.

[0027] Further, preferably, the pre-sampling component includes:

[0028] Multiple sliding blocks are configured, each of which is slidably disposed within the adjustment groove;

[0029] A reset spring is connected between the sliding block and the adjusting groove;

[0030] Linkages, configured in multiples, are rotatably disposed at one end between every two of the sliding blocks; and a pressing plate is hinged to the other end of the multiple linkages.

[0031] Furthermore, preferably, both ends of the connecting rod are fitted with torsion springs, and when no external force is applied, the torsion springs have a tendency to move the pressing plate toward the inner wall of the support plate.

[0032] Compared with the prior art, the present invention provides a pre-extraction assessment device for unconventional natural gas reservoir development, which has the following advantages:

[0033] In this invention, during pre-extraction, a pre-extraction module can provide temporary support within the pre-extraction hole, facilitating the completion of the pre-extraction work. After pre-extraction, the pre-extraction module can be quickly disassembled, allowing for subsequent hole enlargement to convert the pre-extraction hole into an extraction hole. This avoids the difficulty in enlarging the pre-extraction hole due to grouting. Furthermore, during the installation of the pre-extraction module, the extraction head remains inside the support plate, minimizing the entry of debris into the extraction head during installation. Multiple pre-extraction components enable pre-extraction with various parameters, facilitating the evaluation of multiple extraction parameters to determine the optimal extraction parameters. Since multiple extraction heads are at the same depth, the variability in pre-extraction positions is reduced, improving the accuracy of the evaluation. Attached Figure Description

[0034] Figure 1 is a control logic block diagram of a pre-extraction assessment device for the development of unconventional natural gas reservoirs;

[0035] Figure 2 is a schematic diagram of a pre-extraction module of a pre-extraction assessment device for the development of unconventional natural gas reservoirs.

[0036] Figure 3 is a schematic diagram of the support components of a pre-extraction assessment device for unconventional natural gas reservoir development.

[0037] Figure 4 is a schematic diagram of the closed state of the pre-extraction component of a pre-extraction assessment device for the development of unconventional natural gas reservoirs.

[0038] In the diagram: 1. Upper support assembly; 2. Lower support assembly; 3. Connecting shaft; 4. Support plate; 5. Pre-extraction assembly; 6. Extraction chamber; 7. Extraction head; 11. Fixing frame; 12. Adjusting rod; 13. Adjusting gear; 14. Limiting groove; 15. Support rod; 16. Drive gear; 17. Limiting post; 41. Adjusting groove; 51. Pressing plate; 52. Connecting rod; 53. Sliding block; 54. Return spring. Detailed Implementation

[0039] Referring to Figures 1-4, the present invention provides a technical solution: a pre-extraction assessment device for unconventional natural gas reservoir development, comprising:

[0040] Control module;

[0041] The exploration module uses a variety of methods, such as remote sensing and acoustic waves, to create three-dimensional images of underground rock strata in order to obtain information on the distribution and reserves of coal seams or shale gas.

[0042] Pre-drilling module, used for drilling holes at exploration locations;

[0043] The pre-extraction module is used to support and reinforce the borehole wall and to perform pre-extraction operations on the reservoir.

[0044] Fracturing modules are used for fracturing underground rock formations; and

[0045] The evaluation module is used to analyze the extracted gas and extraction pressure.

[0046] In other words, before pre-drainage, it is necessary to use seismic exploration technology to create a three-dimensional image of the underground rock strata to obtain information on the distribution and reserves of coal seams or shale gas, thereby determining the depth of the pre-drilling hole. After the pre-drilling hole is completed, the inner wall of the hole is temporarily supported by the pre-drainage module to facilitate disassembly and installation. Then, the gas is released through the fracturing module and collected and evaluated through the evaluation module.

[0047] In this embodiment, the pre-sampling module includes:

[0048] Upper support component 1 is fixed to the external lifting equipment;

[0049] The lower support assembly 2 is connected to the upper support assembly 1 via a connecting shaft 3;

[0050] Multiple support plates 4 are configured and fixed between the upper support assembly 1 and the lower support assembly 2, and multiple adjustment grooves 41 are provided on their inner walls;

[0051] The pre-extraction assembly 5 is configured in multiples and is hinged between the multiple support plates 4 by means of adjustment groove 41;

[0052] The extraction chamber 6 is fixed to the lower end of the pre-extraction assembly 5 and is connected to an external extraction pump via an extraction pipe 8; and

[0053] The extraction head 7 is fixed to the outer wall of the pre-extraction component 5 and connected to the extraction chamber 6.

[0054] In a preferred embodiment, the upper support component 1 and the lower support component 2 have the same structure, both including:

[0055] Fixture 11;

[0056] Adjusting rods 12 are configured in multiple ways and are slidably disposed within the fixed frame 11;

[0057] Support rod 15, fixed to the adjusting rod 12; and

[0058] Adjusting gear 13 is rotatably mounted on the fixed frame 11.

[0059] It should be noted that the support plate 4 is fixed between the support rod 15 of the upper support assembly 1 and the lower support assembly 2, meaning that it moves synchronously with the support rod 15.

[0060] In a preferred embodiment, an adjusting column is fixed to one end face of the adjusting rod 12, and a plurality of limiting grooves 14 are provided on the adjusting gear 13, with the plurality of limiting grooves 14 corresponding to the plurality of adjusting columns 12.

[0061] In a preferred embodiment, the upper support assembly 1 further includes a drive gear 16 and a limiting post 17, wherein the drive gear 16 is rotatably mounted on the fixed frame 11 and meshes with the adjusting gear 13, the rotation shaft of the drive gear 16 passes through the fixed frame 11 and fixes the limiting post 17, and the limiting post 17 is engaged with the output end of an external motor.

[0062] When the extraction head 7 reaches the designated pre-extraction position, the external motor drives the drive gear 16 to rotate, causing the adjusting gear 13 to rotate, thereby causing the adjusting rod 12 to slide and push the multiple support plates 4 to unfold. At this time, the pre-extraction assembly 5 moves towards the borehole wall. When the support plates 4 are fully unfolded, the pre-extraction assembly 5 fits against the borehole wall, thereby providing all-round support to the borehole wall.

[0063] In a preferred embodiment, the connecting shaft 3 includes an inner shaft and an outer shaft, wherein the inner shaft is fixed between the two fixing brackets 11, the outer shaft is fixed between the two adjusting gears 13, and the inner shaft and the outer shaft are rotatably connected.

[0064] In a preferred embodiment, the pre-sampling component 5 includes:

[0065] Multiple sliding blocks 53 are configured and are all slidably disposed within the adjustment groove 41;

[0066] A reset spring 54 is connected between the sliding block 53 and the adjusting groove 41;

[0067] Linkages 52 are configured in multiples, with one end rotatably disposed between every two sliding blocks 53; and

[0068] Press plate 51 is hinged to the other end of the plurality of links 63.

[0069] In a preferred embodiment, both ends of the connecting rod 52 are fitted with torsion springs, and when no external force is applied, the torsion springs tend to move the pressing plate 51 toward the inner wall of the support plate 4.

[0070] In other words, the torsion spring ensures that the pressing plate 51 always retracts inward during retraction, preventing it from jamming.

[0071] Specifically, during pre-extraction, the pre-extraction module provides temporary support within the pre-extraction hole, facilitating the pre-extraction work. After pre-extraction, the module can be quickly disassembled, allowing for subsequent enlargement of the pre-extraction hole to transform it into an extraction hole. This avoids the difficulty in enlarging the pre-extraction hole due to grouting. Furthermore, during the installation of the pre-extraction module, the extraction head 7 remains inside the support plate 4, minimizing the entry of debris into the extraction head 7. Multiple sets of pre-extraction components 5 enable pre-extraction with various parameters, facilitating the evaluation of multiple extraction parameters to determine the optimal parameters. Since multiple extraction heads 7 are at the same depth, the variability in pre-extraction positions is reduced, improving the accuracy of the evaluation.

[0072] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pre-extraction assessment device for unconventional natural gas reservoir development, characterized in that, include: Control module; The exploration module uses remote sensing, acoustic wave and other methods to create three-dimensional images of underground rock strata in order to obtain information on the distribution and reserves of coal seams or shale gas. The pre-drilling module is used to drill holes at the exploration location; the pre-extraction module is used to support and reinforce the inner wall of the borehole and to perform pre-extraction operations on the reservoir. Fracturing module, used for fracturing underground rock formations; An evaluation module is used to analyze the extracted gas and extraction pressure; the pre-extraction module includes: an upper support assembly (1) fixed to an external lifting device; a lower support assembly (2) connected to the upper support assembly (1) by a connecting shaft (3); multiple support plates (4) configured and fixed between the upper support assembly (1) and the lower support assembly (2), and multiple adjustment grooves (41) are provided on their inner walls; multiple pre-extraction components (5) configured and hinged between the multiple support plates (4) by adjustment grooves (41); and an extraction chamber (6) fixed to the pre-extraction components (5). The lower end of the pre-extraction assembly (5) is connected to an external extraction pump via an extraction pipe (8); the extraction head (7) is fixed to the outer wall of the pre-extraction assembly (5) and connected to the extraction chamber (6); the pre-extraction assembly (5) includes: multiple sliding blocks (53) that are slidably disposed in the adjustment groove (41); a return spring (54) connected between the sliding blocks (53) and the adjustment groove (41); multiple connecting rods (52) that are rotatably disposed at one end between every two sliding blocks (53); and a pressing plate (51) hinged to the other end of the multiple connecting rods (52).

2. The pre-extraction assessment device for unconventional natural gas reservoir development according to claim 1, characterized in that: The upper support assembly (1) and the lower support assembly (2) have the same structure, both including: a fixed frame (11); multiple adjusting rods (12) that are slidably disposed in the fixed frame (11); a support rod (15) fixed on the adjusting rod (12); and an adjusting gear (13) that is rotatably disposed on the fixed frame (11).

3. The pre-extraction assessment device for unconventional natural gas reservoir development according to claim 2, characterized in that: One end face of the adjusting rod (12) is fixed with an adjusting column, and the adjusting gear (13) is provided with multiple limiting grooves (14), which correspond to the multiple adjusting columns.

4. The pre-extraction assessment device for unconventional natural gas reservoir development according to claim 2, characterized in that: The upper support assembly (1) further includes a drive gear (16) and a limiting post (17). The drive gear (16) is rotatably mounted on the fixed frame (11) and meshes with the adjusting gear (13). The rotation shaft of the drive gear (16) passes through the fixed frame (11) and fixes the limiting post (17). The limiting post (17) is engaged with the output end of an external motor.

5. The pre-extraction assessment device for unconventional natural gas reservoir development according to claim 2, characterized in that: The connecting shaft (3) includes an inner shaft and an outer shaft, wherein the inner shaft is fixed between two of the fixing brackets (11), the outer shaft is fixed between two of the adjusting gears (13), and the inner shaft and the outer shaft are rotatably connected.

6. The pre-extraction assessment device for unconventional natural gas reservoir development according to claim 1, characterized in that: Both ends of the connecting rod (52) are fitted with torsion springs, and when no external force is applied, the torsion springs have a tendency to move the pressing plate (51) toward the inner wall of the support plate (4).

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