A method of laying out a testing device

Abstract

The present application relates to the technical field of coal mining, and particularly relates to a method for laying a testing device. The present application provides a method for laying a testing device, which comprises the following steps: placing a retraction and separation device at a first end of a borehole; wherein the first end of the borehole is provided with a tee device; fixing one end of a testing device on the retraction and separation device, and passing the other end of the testing device out through the tee device; fixing the end of the testing device, which is away from the retraction and separation device, on a fixing device outside the first end; connecting a drill rod, which is inserted into the borehole from a second end of the borehole, with the retraction and separation device located at the first end; and driving the retraction and separation device by the drill rod to drive the retraction and separation device from the first end to the second end, so as to lay the testing device in the borehole. The present application provides a method for laying a testing device, which can lay a testing device in a borehole.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a method for laying out a testing device. Background Technology

[0002] During coal mining, the methane content in the borehole is high. If the methane is not extracted in time, it will affect the safe mining of coal.

[0003] In related technologies, it is necessary to lay a linear testing device in the borehole. However, it is difficult to lay a linear testing device in a narrow borehole.

[0004] To address the above problems, there is an urgent need for a method to lay the testing device in the borehole. Summary of the Invention

[0005] This invention provides a method for laying a test device, which is a method for laying the test device in a borehole.

[0006] This invention provides a method for laying out a testing device, comprising:

[0007] The retraction actuator is placed at the first end of the borehole; wherein, the first end of the borehole is provided with a tee device;

[0008] One end of the test device is fixed to the retraction transfer device, and the other end passes through the tee device;

[0009] The end of the test device away from the retraction transfer device is fixed to a fixing device outside the first end;

[0010] The drill rod, inserted into the borehole from the second end of the borehole, is connected to the retraction actuator located at the first end;

[0011] The drill rod is used to drive the retraction actuator from the first end to the second end to lay the test device in the borehole.

[0012] In one possible design, after the drill rod is used to drive the retraction actuator from the first end to the second end to lay the test device in the borehole, the following is further included:

[0013] Connect one port of the three-way device to the extraction system;

[0014] Seal the first end and the three-way device.

[0015] In one possible design, after the drill rod is used to drive the retraction actuator from the first end to the second end to lay the test device in the borehole, the following is further included:

[0016] Separate the retraction transfer device and the testing device;

[0017] The retraction device is connected to the data measurement device by passing it through a four-way device through a drill hole.

[0018] Connect the remaining two ports of the four-way device to the extraction system and the drainage device, respectively.

[0019] Seal the second end and the four-way device.

[0020] In one possible design, the data measurement device includes a gas analyzer.

[0021] In one possible design, the retraction actuator includes a retraction body, one end of which is connected to the drill bit assembly, and the other end is fixed to a linear test device.

[0022] The retraction body is columnar, comprising a core and a columnar shell. The core includes a base and a fixing unit. One end of the shell is connected to the base. The fixing unit is inserted into the shell. The fixing unit has a groove facing the base at one end near the base. A rod-shaped fixing member is provided between the two inner walls of the groove. One end of the testing device is fixed to the fixing member, and the other end protrudes from the shell.

[0023] In one possible design, the fixing unit has a winding part at one end away from the base. The winding part includes a fixing plate and a fixing post. The fixing plate is fixed to the core by the fixing post, and the testing device is wound around the fixing post.

[0024] In one possible design, an annular baffle is provided at the end of the housing away from the base, and the testing device passes through the center of the baffle and exits the housing.

[0025] In one possible design, a clamping member is inserted through the hollowed-out portion at the center of the baffle. The clamping member includes a columnar connecting part and a screw tube clamp. One end of the connecting part is sealed to the baffle, and the other end is connected to the screw tube clamp. The test device in the housing passes through the connecting part and the screw tube clamp in sequence, and the test device is clamped by adjusting the screw tube clamp.

[0026] In one possible design, a sealing ring is provided between the baffle and the connecting part.

[0027] In one possible design, a connecting device is also included, which is used to connect the retraction actuator device and the drill bit device. The connecting device is rotatably connected to the retraction actuator device and fixedly connected to the drill bit device.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] The retraction actuator is positioned at the first end of the borehole, and one end of the test device is then fixed to the retraction actuator. A tee is provided at the first end of the borehole. After fixing one end of the test device to the retraction actuator, the other end of the test device is passed through the tee. To facilitate the retraction actuator's movement of the test device within the borehole, the test device protruding from the tee is fixed to a fixing device outside the first end of the borehole; this fixing device can be an anchor mesh installed in the tunnel. After fixing the test device to the fixing device, the drill rod is inserted from the second end of the borehole, until the mounting part of the drill rod head reaches the first end of the borehole. The mounting part of the drill rod is connected to the retraction actuator. The drill rod is retracted; during this retraction, it moves the retraction actuator and the test device fixed to the retraction actuator from the first end to the second end, so that both ends of the test device are located at the first and second ends respectively, thus completing the placement of the test device within the borehole. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a side view of a retraction maneuver device for coal seam drilling testing provided in an embodiment of the present invention;

[0032] Figure 2 This is a top view schematic diagram of a retraction splitter device for coal seam drilling testing provided in an embodiment of the present invention;

[0033] Figure 3 This is a cross-sectional structural schematic diagram of a retraction maneuver device for coal seam drilling testing provided in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of a drilling test system provided in one embodiment of the present invention;

[0035] Figure 5This is a schematic diagram of a drilling test system provided in another embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of another drilling test system provided in one embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of another drilling test system provided in one embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of another drilling test system provided in another embodiment of the present invention;

[0039] Figure 9 This is a schematic diagram of another drilling test system provided in another embodiment of the present invention.

[0040] In the picture:

[0041] 1- Retreat main body;

[0042] 11-Core;

[0043] 111-Base;

[0044] 112 - Fixed unit;

[0045] 112a - Groove;

[0046] 112b - Fastener;

[0047] 112c - Winding section;

[0048] 112c1 - Fixing plate;

[0049] 112c2 - Fixed column;

[0050] 12-Shell;

[0051] 13-Baffle;

[0052] 14-Clamping components;

[0053] 141 - Connecting part;

[0054] 142-Screw clamp;

[0055] 15 - Sealing ring;

[0056] 2-Testing apparatus;

[0057] 3-Connecting device. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0059] This invention provides a method for laying out a testing device, comprising:

[0060] The retraction transfer device is placed at the first end of the borehole; wherein, a tee device is provided at the first end of the borehole;

[0061] One end of the test device is fixed to the retraction transfer device, and the other end is passed out through the tee device;

[0062] Fix the end of the test device away from the retraction transfer device to the fixing device outside the first end;

[0063] The drill rod, inserted into the borehole from the second end, is connected to the retraction actuator located at the first end.

[0064] The drill rod is used to drive the retraction actuator from the first end to the second end to lay the test device in the borehole.

[0065] The retraction actuator is positioned at the first end of the borehole, and one end of the test device is then fixed to the retraction actuator. A tee is provided at the first end of the borehole. After fixing one end of the test device to the retraction actuator, the other end of the test device is passed through the tee. To facilitate the retraction actuator's movement of the test device within the borehole, the test device protruding from the tee is fixed to a fixing device outside the first end of the borehole; this fixing device can be an anchor mesh installed in the tunnel. After fixing the test device to the fixing device, the drill rod is inserted from the second end of the borehole, until the mounting part of the drill rod head reaches the first end of the borehole. The mounting part of the drill rod is connected to the retraction actuator. The drill rod is retracted; during this retraction, it moves the retraction actuator and the test device fixed to the retraction actuator from the first end to the second end, so that both ends of the test device are located at the first and second ends respectively, thus completing the placement of the test device within the borehole.

[0066] In some embodiments of the present invention, after using the drill pipe to drive the retraction actuator from the first end to the second end to lay the test device in the borehole, the method further includes:

[0067] Connect one port of the three-way device to the extraction system;

[0068] Seal the connection between the first end and the tee.

[0069] In this embodiment, after the test device is laid, it is necessary to use the test device to test the negative pressure in the borehole. Therefore, it is necessary to connect the extraction system at the port of the borehole to extract the gas in the borehole in order to test the negative pressure in the borehole. To extract the negative pressure, it is necessary to seal the first end of the borehole and the three-way device so that the extraction system can be used to extract the borehole gas.

[0070] In some embodiments of the present invention, after using the drill pipe to drive the retraction actuator from the first end to the second end to lay the test device in the borehole, the method further includes:

[0071] Separating and retracting transfer case and testing device;

[0072] The retraction device is passed through the drill hole via a four-way connector and connected to the data measurement device.

[0073] Connect the remaining two ports of the four-way device to the extraction system and the drainage device, respectively.

[0074] Seal the connection between the second end and the four-way connector.

[0075] In this embodiment, to more accurately test the negative pressure in the borehole, extraction can be performed at both ends of the borehole separately or simultaneously. Therefore, the second end of the borehole also needs to be sealed. In addition, it is necessary to collect and analyze the concentration and composition of the extracted gas, and it is also necessary to drain the water from the borehole. Therefore, two of the ports of the four-way device are connected to the extraction system and the drainage device, respectively.

[0076] In some embodiments of the present invention, the data measurement device includes a gas analyzer.

[0077] like Figures 1 to 5 As shown, this embodiment of the invention provides a retraction actuator device for coal seam drilling testing. The retraction actuator device includes a retraction body 1, one end of which is connected to the drill bit device, and the other end is fixed to a linear testing device 2.

[0078] The retraction body 1 is columnar, including a core 11 and a columnar shell 12. The core 11 includes a base 111 and a fixing unit 112. One end of the shell 12 is connected to the base 111. The fixing unit 112 is inserted into the shell 12. The fixing unit 112 has a groove 112a facing the base 111 at one end near the base 111. A rod-shaped fixing member 112b is provided between the two inner walls of the groove 112a. One end of the testing device 2 is fixed to the fixing member 112b, and the other end protrudes from the shell 12.

[0079] To address the difficulty in laying the test device 2, this application provides a retraction actuator device for laying the test device 2 in a coal seam borehole. After the test device 2 is laid, data such as negative pressure and flow rate in the borehole can be tested using the test device 2. The retraction actuator device is used to fix the test device 2. Due to the narrow and rugged nature of the borehole, it is necessary to ensure a stable connection between the retraction actuator device and the test device 2 during the laying process. Therefore, one end of the test device 2 is fixed to the fixing member 112b. Since the fixing member 112b is columnar and the test device 2 is linear, one end of the test device 2 can be wrapped around the fixing member 112b, and the fixing of the test device 2 to the fixing member 112b can be made more stable by knotting. The fixing member 112b is located at one end of the core 11, and a shell 12 is provided outside the core 11. After one end of the test device 2 is fixed to the fixing member 112b, the remaining part protrudes from the shell 12. The housing 12, which covers the fixing unit 112, protects the connection 141 between the test device 2 and the fixing member 112b, preventing falling gravel and rock fragments from damaging the connection between the fixing member 112b and the test device 2. The retraction actuator is connected to the drill bit assembly, which is used to break through obstacles in the borehole and drive the retraction actuator to lay the test device 2 in the borehole. It should be noted that the drill bit assembly is connected to a drill rod and is driven by the drill rod.

[0080] In some embodiments of the present invention, the end of the fixing unit 112 away from the base 111 is provided with a winding part 112c. The winding part 112c includes a fixing plate 112c1 and a fixing post 112c2. The fixing plate 112c1 is fixed to the core 11 by the fixing post 112c2, and the testing device 2 is wound on the fixing post 112c2.

[0081] In this embodiment, a winding portion 112c for further securing the testing device 2 is provided at the end of the core 11 away from the base 111. The winding portion 112c includes a fixing plate 112c1 and a fixing post 112c2. The fixing plate 112c1 and the core 11 are fixedly connected by the fixing post 112c2. After the testing device 2 is wound around the fixing post 112c2, it continues to be wound around the fixing member 112b and is finally knotted and fixed on the fixing member 112b.

[0082] In some embodiments of the present invention, a ring-shaped baffle 13 is provided at one end of the housing 12 away from the base 111, and the testing device 2 passes through the center of the baffle 13 and exits the housing 12.

[0083] In this embodiment, the annular baffle 13 can block some of the rocks and debris from entering the housing 12 without affecting the test device 2 from passing through the center of the baffle 13.

[0084] In some embodiments of the present invention, a clamping member 14 is provided through the hollow portion in the center of the baffle 13. The clamping member 14 includes a columnar connecting portion 141 and a screw clamp 142. One end of the connecting portion 141 is sealed to the baffle 13, and the other end is connected to the screw clamp 142. The test device 2 in the housing 12 passes through the connecting portion 141 and the screw clamp 142 in sequence. The test device 2 is clamped by adjusting the screw clamp 142.

[0085] In this embodiment, the clamping member 14 further closes the central opening of the baffle 13. The clamping member 14 includes a connecting part 141 and a screw clamp 142. The connecting part 141 passes through the baffle 13, and the screw clamp 142 is disposed on the connecting part 141. The testing device 2 passes through the screw clamp 142, and the testing device 2 can be further fixed by clamping the screw clamp 142.

[0086] It is understandable that the connecting part 141 can be connected to the baffle 13 or to the core 11.

[0087] In some embodiments of the present invention, a sealing ring 15 is provided between the baffle 13 and the connecting portion 141.

[0088] In this embodiment, the sealing ring 15 can ensure the sealing between the baffle 13 and the connecting part 141.

[0089] In some embodiments of the present invention, a connecting device 3 is also included. The connecting device 3 is used to connect the retraction actuator device and the drill bit device. The connecting device 3 is rotatably connected to the retraction actuator device and fixedly connected to the drill bit device.

[0090] In this embodiment, the drill bit needs to be rotated to facilitate the breaking of obstructing rocks in the borehole. To prevent the retraction actuator from rotating with the drill bit, the two are connected by a connecting device 3. The end of the connecting device 3 connected to the retraction actuator is a rotatable connection, such as a bearing connection. This prevents the retraction actuator from rotating with the drill bit.

[0091] This invention also provides a method for using a retraction actuator device for coal seam drilling testing. Based on the retraction actuator device described in any of the above embodiments, the method includes:

[0092] Insert one end of the test device 2 into the housing 12 and fix it on the fastener 112b;

[0093] The retraction actuator is connected to the drill bit assembly; wherein, the drill bit assembly is connected to the drill rod;

[0094] The test device 2 is laid in the borehole using the drill rod to drive the drill bit device and the retraction actuator device.

[0095] In some embodiments of the present invention, a winding portion 112c is provided at one end of the fixing unit 112 away from the base 111. The winding portion 112c includes a fixing plate 112c1 and a fixing post 112c2. The fixing plate 112c1 is fixed to the core 11 by the fixing post 112c2, and the testing device 2 is wound on the fixing post 112c2.

[0096] One end of the testing device 2 is inserted into the housing 12 and fixed to the fastener 112b, including:

[0097] Insert one end of the test device 2 into the housing 12;

[0098] The test device 2 is wound around the fixed column 112c2;

[0099] One end of the test device 2 is fixed to the fastener 112b.

[0100] In some embodiments of the present invention, an annular baffle 13 is provided at the end of the housing 12 away from the base 111;

[0101] Inserting one end of the testing device 2 into the housing 12 includes:

[0102] One end of the test device 2 is inserted into the housing 12 through the center of the baffle 13.

[0103] In some embodiments of the present invention, a clamping member 14 is provided through the hollow part in the center of the baffle 13. The clamping member 14 includes a columnar connecting part 141 and a screw clamp 142. One end of the connecting part 141 is sealed to the baffle 13, and the other end is connected to the screw clamp 142.

[0104] Before inserting one end of the testing device 2 into the housing 12, the following is also included:

[0105] Separate clamping member 14 and baffle 13;

[0106] Inserting one end of the testing device 2 into the housing 12 includes:

[0107] One end of the test device 2 is inserted into the housing 12 via the screw clamp 142;

[0108] After fixing one end of the testing device 2 to the fixing member 112b, it also includes:

[0109] Connecting clamp 14 and baffle 13;

[0110] Tighten the screw clamp 142 to clamp the test device 2.

[0111] The method provided in this embodiment of the invention and the device provided in the above embodiments are based on the same inventive concept. Therefore, they can achieve the same technical effects. For specific effects, please refer to the above text, and will not be repeated here.

[0112] After the test device 2 is installed, the negative pressure at different depths of the borehole can be calculated based on the test results of the test device 2.

[0113] Please refer to Figure 4 This invention provides a method for calculating negative pressure in boreholes, comprising:

[0114] The test device is laid in the borehole using a retraction maneuver device; the test device includes multiple test tubes, each test tube including an air extraction end and a test end, and the multiple test ends are located at different depths in the borehole;

[0115] For each test tube, perform the following steps:

[0116] Connect the extraction system to the borehole;

[0117] Connect one end of the negative pressure gauge to the suction end and seal the other end of the negative pressure gauge.

[0118] Start the extraction system and record the first negative pressure value of the negative pressure gauge;

[0119] A negative pressure calculation model is established based on multiple first negative pressure values ​​and the depth of multiple test terminals;

[0120] The negative pressure value at any borehole depth is calculated using a negative pressure calculation model.

[0121] In this embodiment, multiple test tubes are set up, each including an extraction end and a test end. The test tubes have different lengths, and the test ends of the multiple test tubes are inserted into the borehole, placing them at different positions within the borehole. For each test tube, the following test operations are performed: the extraction system is connected to one end of the borehole; one end of a negative pressure gauge is connected to the extraction end, and the other end of the negative pressure gauge is sealed; the extraction system is turned on to extract gas from the borehole. Since the extraction end is connected to one end of the negative pressure gauge, the other end of the negative pressure gauge is sealed, and the test end is located in the borehole, the gas in the borehole is continuously extracted. Therefore, the first negative pressure value displayed by the negative pressure gauge is the negative pressure value of the test tube at that depth. After measuring the first negative pressure value of each test tube, different negative pressure values ​​(first negative pressure values) at different depths (depth of the test section) in the borehole are obtained, thus obtaining the mapping relationship between borehole depth and negative pressure value, i.e., the negative pressure calculation model. After obtaining the negative pressure calculation model, the negative pressure value at any borehole depth can be calculated.

[0122] In this embodiment, the flow meter can also be connected in series with the negative pressure gauge, and the flow meter can measure the flow rate of the test tube.

[0123] It is understandable that, such as Figure 4 As shown, closing the valve between the extraction system and the flow meter achieves the effect of sealing the extraction end in this embodiment.

[0124] It should be noted that the gas extraction end can be connected through a gas extraction single bundle tube. In addition to being connected to the extraction system, the gas extraction single bundle tube is also connected to the extraction pump. Then, a gas sampler is connected to the extraction pump to obtain the changes in negative pressure and concentration at each monitoring point (test end) of the extraction borehole over time during the extraction cycle, as well as the changes in negative pressure and concentration along the extraction borehole.

[0125] In this embodiment, the testing device includes multiple test tubes and an outer sheath, with the multiple test tubes enclosed within the outer sheath. The suction end of each test tube is located at the same end of the testing device, while the test ends are located at different positions within the testing device. To facilitate negative pressure testing at the test ends of the test tubes, air sampling nozzles are provided at the positions of the outer sheath corresponding to different test ends, allowing the test ends to communicate with the borehole.

[0126] like Figure 4 As shown, in some embodiments of the present invention, it further includes:

[0127] For each test tube, perform the following steps:

[0128] The extraction system is connected to the borehole and the extraction end respectively; a negative pressure gauge is installed between the extraction end and the extraction system.

[0129] Start the extraction system and record the second negative pressure value of the negative pressure gauge;

[0130] For each test tube, the first theoretical value is determined based on the second negative pressure value measured by the test tube and the tube diameter ratio of the test tube;

[0131] A negative pressure calculation model is established based on multiple initial negative pressure values ​​and the depth of multiple test terminals, including:

[0132] Multiple first theoretical values ​​are used to verify multiple first negative pressure values, resulting in multiple first verification negative pressure values;

[0133] A negative pressure calculation model is established based on multiple first theoretical values, multiple first verification negative pressure values, and the depth of multiple test terminals.

[0134] Since the first negative pressure value measured in the above embodiment is the actual negative pressure value measured at the test end, any problem with any device or component in the test system will affect the first negative pressure value, causing a large deviation between the measured first negative pressure value and the negative pressure value in the borehole. Therefore, this embodiment is designed to find the large deviation value in the first negative pressure value.

[0135] In this embodiment, for each test tube, the extraction system is connected to both the borehole and the extraction end, and the extraction system simultaneously extracts gas from both ends. Since the extraction system directly extracts gas from the extraction end, while indirectly extracting gas from the test end through the borehole, the negative pressure at the extraction end is higher, causing gas to flow from the test end to the extraction end. At this point, the test tube forms a negative pressure system, and the second negative pressure value displayed on the negative pressure gauge is the negative pressure value of this system. Further, the theoretical negative pressure value at the test end of the test tube, i.e., the first theoretical value, can be determined by the ratio of the second negative pressure value to the tube diameter. The first negative pressure value is verified using the first theoretical value of the same test tube. If the first theoretical value and the first negative pressure value deviate significantly, then the first negative pressure value is incorrect. After deleting the incorrect first negative pressure value, the remaining value is the correct first verification negative pressure value. In addition to verifying the first negative pressure value, the first theoretical value can also participate in the establishment of the negative pressure calculation model. The negative pressure calculation model established based on multiple first theoretical values, multiple first verified negative pressure values, and the depth of multiple test terminals is more accurate.

[0136] It should be noted that when the sampling system is connected to the same test tube, the first negative pressure value and the second negative pressure value of the test tube can be tested at the same time to improve the testing efficiency.

[0137] It is understandable that, such as Figure 4 As shown, opening the valve between the extraction system and the flow meter allows the extraction system in this embodiment to simultaneously extract from the borehole and the extraction end.

[0138] In some embodiments of the present invention, multiple first negative pressure values ​​are verified using multiple first theoretical values ​​to obtain multiple first verification negative pressure values, including:

[0139] The first difference value is obtained by subtracting the first theoretical value and the first negative pressure value measured in the same test tube.

[0140] Mark the first difference that is higher than the first preset value;

[0141] Delete the first negative pressure value corresponding to the first difference marked with the label;

[0142] The first negative pressure value that was not deleted is determined as the first verification negative pressure value.

[0143] In this embodiment, the first theoretical value and the first negative pressure value of the same test tube are first subtracted to obtain the first difference value. Each first difference value is compared with the first preset value, and the first difference values ​​that are higher than the first preset value are marked. The first negative pressure value with the marked first difference value is the error value. After removing the error value, the remaining first negative pressure value is the first verification negative pressure value.

[0144] It should be noted that the first preset value can be an empirical value or determined by averaging multiple first differences. Specifically, 1.4 to 2 times the average can be used as the first preset value.

[0145] In some embodiments of the present invention, the first theoretical value is obtained by the following formula:

[0146] Δp=λ×l / d×(ρv2 / 2)

[0147] L1=Δp-f2

[0148] Where Δp is the pressure drop, λ is the friction coefficient, l is the length of the test tube, d is the diameter of the test tube, ρ is the density of the fluid in the test tube, L1 is the first theoretical value, and f2 is the second negative pressure value.

[0149] In this embodiment, the pressure drop is obtained by considering the aspect ratio of the test tube, the fluid density, and the friction coefficient. The difference between the pressure drop and the second negative pressure value is the theoretical negative pressure value (first theoretical value) at the test end. The friction coefficient can be determined experimentally, and the fluid density can be determined by the gas concentration of the gas flowing through the test tube.

[0150] like Figure 5 As shown, in some embodiments of the present invention, it further includes:

[0151] For each test tube, perform the following steps:

[0152] Connect the extraction system to the borehole;

[0153] Connect one end of the negative pressure gauge to the suction end, and connect the other end of the negative pressure gauge to the outside of the borehole;

[0154] Turn on the extraction system and record the third negative pressure value of the negative pressure gauge;

[0155] For each test tube, the second theoretical value is determined based on the third negative pressure value measured by the test tube and the tube diameter ratio of the test tube;

[0156] A negative pressure calculation model is established based on multiple initial negative pressure values ​​and the depth of multiple test terminals, including:

[0157] Multiple second theoretical values ​​are used to verify multiple first negative pressure values ​​to obtain multiple second verification negative pressure values;

[0158] A negative pressure calculation model is established based on multiple second theoretical values, multiple second verification negative pressure values, and the depth of multiple test terminals.

[0159] In order to verify the first negative pressure value through multiple methods and angles, and to provide more data for establishing a negative pressure calculation model, this embodiment is designed to obtain the third negative pressure value and the second theoretical value.

[0160] In this embodiment, for each test tube, an extraction system is connected to the borehole, with the extraction end open to the external environment of the borehole (i.e., the extraction end is not sealed and not connected to the extraction system). The extraction system extracts gas from the borehole. Because the extraction system extracts gas from the test end through the borehole, a large negative pressure is created at the test end. Since the extraction end is open to the external environment of the borehole, gas flows from the extraction end to the test end. At this time, the test tube forms a negative pressure system, and the third negative pressure value displayed by the negative pressure gauge is the negative pressure value of this system. Further, the theoretical negative pressure value of the test end of the test tube can be determined by the ratio of the third negative pressure value to the tube diameter, i.e., the second theoretical value. The second theoretical value of the same test tube is used to verify the first negative pressure value. If the second theoretical value and the first negative pressure value deviate significantly, then the first negative pressure value is incorrect. After deleting the incorrect first negative pressure value, the remaining value is the correct second verification negative pressure value. In addition to verifying the first negative pressure value, the second theoretical value can also participate in the establishment of the negative pressure calculation model. The negative pressure calculation model established based on multiple second theoretical values, multiple first verification negative pressure values, and the depth of multiple test terminals is more accurate.

[0161] It should be noted that when the sampling system is connected to the same test tube, the first negative pressure value and the third negative pressure value of the test tube can be tested at the same time to improve the testing efficiency.

[0162] It should be noted that because the flow direction of the gas in the test tube changes, the connection of the negative pressure gauge needs to be changed.

[0163] In some embodiments of the present invention, multiple first negative pressure values ​​are verified using multiple second theoretical values ​​to obtain multiple second verification negative pressure values, including:

[0164] The second difference value is obtained by subtracting the second theoretical value and the first negative pressure value measured in the same test tube.

[0165] Mark the second difference that is higher than the second preset value;

[0166] Delete the first negative pressure value corresponding to the marked second difference;

[0167] The first negative pressure value that was not deleted is determined as the second verification negative pressure value.

[0168] In this embodiment, the second theoretical value and the first negative pressure value of the same test tube are first subtracted to obtain a second difference value. Each second difference value is compared with a second preset value, and the second difference values ​​that are higher than the second preset value are marked. The first negative pressure value with the marked second difference value is the error value. After removing the error value, the remaining second negative pressure value is the second verification negative pressure value.

[0169] It should be noted that the second preset value can be an empirical value or determined by averaging multiple second differences. Specifically, 1.4 to 2 times the average can be used as the second preset value. The first preset value can be the same as or different from the second preset value.

[0170] In some embodiments of the present invention, the second theoretical value is obtained by the following formula:

[0171] Δp=λ×l / d×(ρv 2 / 2)

[0172] L2=Δp-f3

[0173] Where Δp is the pressure drop, λ is the friction coefficient, l is the length of the test tube, d is the diameter of the test tube, ρ is the density of the fluid in the test tube, L2 is the second theoretical value, and f3 is the third negative pressure value.

[0174] In this embodiment, the pressure drop is obtained by considering the aspect ratio of the test tube, the fluid density, and the friction coefficient. The difference between the pressure drop and the third negative pressure value is the theoretical negative pressure value (second theoretical value) at the test end. The friction coefficient can be determined experimentally, and the fluid density can be determined by the gas concentration of the gas flowing through the test tube.

[0175] like Figure 4 , 6 As shown in Figure 7, in some embodiments of the present invention, two extraction systems are included, which are respectively disposed on both sides of the borehole;

[0176] Connecting the extraction system to the borehole includes:

[0177] Two extraction systems were connected to the two ends of the borehole, respectively.

[0178] Turn on the extraction system and record the first negative pressure value of the negative pressure gauge, including:

[0179] Start the two sampling systems separately and record the first negative pressure value of the negative pressure gauges respectively;

[0180] Simultaneously activate two sampling systems and record the first negative pressure value of the negative pressure gauge.

[0181] To ensure the measured data more closely approximates real-world data, extraction systems are installed at both ends of the borehole. Specifically, when measuring the first negative pressure value, extraction is performed at both ends of the borehole, and then simultaneously at both ends. These three extractions yield three first negative pressure values. This setup improves the accuracy of the first negative pressure value, reduces errors, and increases the data available for establishing the negative pressure calculation model.

[0182] It should be noted that in order to ensure that the negative pressure inside the extraction borehole reaches a balanced state, the extraction interval should be at least 6 days.

[0183] In this embodiment, Figure 4 , 6 The extraction valve in section 7 is in the closed state.

[0184] like Figure 4 , 6 As shown in Figure 7, in some embodiments of the present invention, two extraction systems are included, which are respectively disposed on both sides of the borehole;

[0185] The extraction system is connected to both the borehole and the extraction end, including:

[0186] Connect a extraction system to the first end and the extraction end of the borehole, respectively;

[0187] Connect another extraction system to the second end of the borehole;

[0188] Turn on the extraction system and record the second negative pressure value of the negative pressure gauge, including:

[0189] Simultaneously activate two extraction systems and record the second negative pressure value of the negative pressure gauge;

[0190] Disconnect the first end from the sampling system, and simultaneously turn on both sampling systems and record the second negative pressure value of the negative pressure gauge;

[0191] Disconnect the second end from the sampling system, and simultaneously turn on both sampling systems and record the second negative pressure value of the negative pressure gauge.

[0192] To ensure the measured data more closely approximates real-world data, extraction systems are installed at both ends of the borehole. Specifically, when measuring the second negative pressure value, extraction is performed separately at both ends of the borehole, and then simultaneously at both ends. This three-stage extraction process yields three second negative pressure values. This setup improves the accuracy of the second negative pressure value, reduces errors, and increases the data available for establishing the negative pressure calculation model.

[0193] In this embodiment, regardless of which end of the borehole is being pumped from, a pumping system needs to be connected to the pumping end. When one pumping system is pumping air through the pumping end and another pumping system is pumping air at one end of the borehole, it is necessary to ensure that the power of the two pumping systems is the same.

[0194] It should be noted that in order to ensure that the negative pressure inside the extraction borehole reaches a balanced state, the extraction interval should be at least 6 days.

[0195] In this embodiment, Figure 4 , 6 The extraction valve in section 7 is in the open position.

[0196] like Figure 5 , 8As shown in Figures 9 and 1, in some embodiments of the present invention, two extraction systems are included, which are respectively disposed on both sides of the borehole.

[0197] Connecting the extraction system to the borehole includes:

[0198] Connect the two extraction systems to the two ends of the borehole respectively;

[0199] Turn on the extraction system and record the third negative pressure value of the negative pressure gauge, including:

[0200] Turn on the two sampling systems separately and record the third negative pressure value of the negative pressure gauge respectively;

[0201] Simultaneously activate two extraction systems and record the third negative pressure value of the negative pressure gauge.

[0202] To ensure the measured data more closely approximates real-world data, extraction systems are installed at both ends of the borehole. Specifically, when measuring the third negative pressure value, extraction is performed at both ends of the borehole separately, and then simultaneously at both ends. This three-stage extraction process yields three third negative pressure values. This setup improves the accuracy of the third negative pressure value, reduces errors, and increases the data available for establishing the negative pressure calculation model.

[0203] It should be noted that in order to ensure that the negative pressure inside the extraction borehole reaches a balanced state, the extraction interval should be at least 6 days.

[0204] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for laying out a testing device, characterized in that, include: The retraction actuator is placed at the first end of the borehole; wherein, the first end of the borehole is provided with a tee device; One end of the test device is fixed to the retraction transfer device, and the other end passes through the tee device; The end of the test device away from the retraction transfer device is fixed to a fixing device outside the first end; The drill rod, inserted into the borehole from the second end of the borehole, is connected to the retraction actuator located at the first end; The drill rod is used to drive the retraction actuator from the first end to the second end to lay the test device in the borehole; The retraction actuator includes a retraction body (1), one end of which is connected to the drill bit device, and the other end is fixed to a linear test device (2). The retraction body (1) is columnar, including a core (11) and a columnar shell (12). The core (11) includes a base (111) and a fixing unit (112). One end of the shell (12) is connected to the base (111). The fixing unit (112) is inserted into the shell (12). The fixing unit (112) has a groove (112a) facing the base (111) at one end near the base (111). A rod-shaped fixing member (112b) is provided between the two inner walls of the groove (112a). One end of the testing device (2) is fixed to the fixing member (112b), and the other end protrudes from the shell (12). It also includes a connecting device (3), which is used to connect the retraction actuator device and the drill bit device. The connecting device (3) is rotatably connected to the retraction actuator device and fixedly connected to the drill bit device.

2. The method according to claim 1, characterized in that, After the drill rod is used to drive the retraction actuator from the first end to the second end to lay the test device in the borehole, the method further includes: Connect one port of the three-way device to the extraction system; Seal the first end and the three-way device.

3. The method according to claim 1, characterized in that, After the drill rod is used to drive the retraction actuator from the first end to the second end to lay the test device in the borehole, the method further includes: Separate the retraction transfer device and the testing device; The retraction actuator is connected to the data measurement device via a four-way connector through a drill hole. Connect the remaining two ports of the four-way device to the extraction system and the drainage device, respectively. Seal the second end and the four-way device.

4. The method according to claim 3, characterized in that, The data measurement device includes a gas analyzer.

5. The method according to claim 1, characterized in that, The fixing unit (112) has a winding part (112c) at one end away from the base (111). The winding part (112c) includes a fixing plate (112c1) and a fixing post (112c2). The fixing plate (112c1) is fixed on the core (11) by the fixing post (112c2), and the testing device (2) is wound on the fixing post (112c2).

6. The method according to claim 1, characterized in that, The housing (12) is provided with an annular baffle (13) at one end away from the base (111), and the test device (2) passes through the center of the baffle (13) and exits the housing (12).

7. The method according to claim 6, characterized in that, A clamping member (14) is provided through the hollow part in the center of the baffle (13). The clamping member (14) includes a columnar connecting part (141) and a screw clamp (142). One end of the connecting part (141) is sealed to the baffle (13), and the other end is connected to the screw clamp (142). The test device (2) in the housing (12) passes through the connecting part (141) and the screw clamp (142) in sequence. The test device (2) is clamped by adjusting the screw clamp (142).

8. The method according to claim 7, characterized in that, A sealing ring (15) is provided between the baffle (13) and the connecting part (141).

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