A non-drilling water pressure test device and water pressure test method

Abstract

The present invention provides a non-drilling water pressure test device, including a center tube, a valve system assembly, and a rubber cylinder assembly; the center tube is provided with a central through opening; the rubber cylinder assembly is provided at the middle part of the center tube, and the valve system assembly is provided at the bottom end of the center tube; the valve system assembly includes a valve joint and a positive and negative valve, the valve joint is provided with a central through opening, the input end of the valve joint is connected with the output end of the center tube, and the positive and negative valves are provided in the valve joint and contact with the output end of the center tube; the positive and negative valves can control the downstream and reflux of water. Through the provision of the positive and negative valves, the present invention can control whether the output end of the center tube is in contact and whether the reflux can pass through the positive and negative valves according to the changes in the pressure in the mine, thereby controlling the expansion and contraction of the rubber cylinder assembly, and further realizing that the water pressure test can be carried out without drilling.

Description

Technical Field

[0001] The invention relates to the technical field of underground directional drilling in coal mines, in particular to a water pressure test device and a water pressure test method without drilling. Background Art

[0002] The ground regional exploration and control of limestone water in the mining floor of Group A coal is a new technology that explores and high-pressure grouting the limestone aquifer in the floor of the coal seam through the construction of multi-branch horizontal wells on the ground, blocks the vertical water conduction channels of the limestone, and eliminates the hidden dangers of water inrush in the floor of Group A coal. Huainan Mining (Group) has achieved the expected results since the launch of regional exploration and control projects. In order to further improve the accuracy of the regional control exploration data of limestone water in the floor of Group A coal, the Coal Industry Company's Document No. 4 of 2021 (Huai Mining Coal Industry Safety

[2021] No. 4) stipulates that "in the process of horizontal section construction of regional exploration and control projects, in principle, drilling should be stopped for a water pressure test every 300m of drilling", and the water absorption rate of boreholes in different sections of the boreholes should be explored to discover possible water conduction channels within the control range, to ensure that the regional control project is "accurately explored and effectively controlled".

[0003] According to the length of branch holes in our company's ground area exploration and control project for bottom limestone water hazards in the west wing of the East-1 Coal Mining Area of ​​Zhangji Coal Mine, each branch hole needs to be drilled and water-pressurized 3 to 4 times, with a very high frequency; during the on-site construction process, the conventional water pressure test procedure mainly includes: drilling to the depth of the water pressure hole, pulling out all the drill tools in the hole, installing the hole mouth device, water pressure test, and drilling down to the bottom of the hole to continue drilling; the whole process takes at least 2 shifts; in addition, the drilling stop time is long due to drilling and water pressure, which is prone to accidents in the hole. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a device which can carry out water pressure test without drilling.

[0005] The present invention solves the above technical problems through the following technical means:

[0006] A non-drilling water pressure test device comprises a center pipe (1), a valve system assembly (3), and a rubber cylinder assembly (5); the center pipe (1) is provided with a central through opening; the rubber cylinder assembly (5) is provided at the middle part of the center pipe (1), and the valve system assembly (3) is provided at the bottom end of the center pipe (1); the valve system assembly (3) comprises a valve joint (31) and a forward and reverse valve (32); the valve joint (31) is provided with a central through opening, the input end of the valve joint (31) is connected to the output end of the center pipe (1), and the forward and reverse valve (32) is provided in the valve joint (31) and contacts the output end of the center pipe (1); the forward and reverse valve (32) can control the forward flow and reverse flow of water.

[0007] Beneficial effects: Through the mutual cooperation of the center tube, the valve system assembly and the rubber cylinder assembly, the center tube is connected with the valve system assembly, and the valve system assembly is provided with positive and negative valves capable of controlling the downstream and reflux of water flow. The middle part of the center tube is provided with a rubber cylinder assembly, which can expand and seal the mine when the water pressure is too high, and can return to its original state when the water pressure returns to normal. Through the above arrangement, the water pressure test can be carried out without drilling.

[0008] Furthermore, the forward and reverse valve (32) comprises a valve core (321) and a spring (322), the top end of the valve core (321) contacts the bottom end of the central tube (1), and the bottom end of the valve core (321) is provided with a spring (322).

[0009] Beneficial effect: The valve core can be reset by setting the spring.

[0010] Furthermore, the diameter of the bottom end of the valve core (321) is smaller than the diameter of the stem of the valve core (321), and the spring (322) is sleeved on the bottom end of the valve core (321).

[0011] Furthermore, there is a reflux ball (323), the valve core (321) is provided with a central through opening, and a first reflux channel (3211) and a second reflux channel (3212) are provided in the valve core (321) from top to bottom, and the diameter of the first reflux channel (3211) is larger than the diameter of the second reflux channel (3212); and a reflux ball (323) is detachably connected at the interface between the first reflux channel (3211) and the second reflux channel (3212).

[0012] Beneficial effect: By setting the reflux ball, the opening and closing of the interface between the first reflux channel and the second reflux channel can be controlled.

[0013] Furthermore, a semicircular groove is provided at the interface between the first reflux channel (3211) and the second reflux channel (3212), and a reflux ball (323) is placed in the semicircular groove; a limiting plate (3213) is fixed at the top of the first reflux channel (3211), and a plurality of openings are provided on the limiting plate (3213) parallel to the reflux channel.

[0014] Beneficial effect: The return flow ball can be limited by setting the limit plate.

[0015] Furthermore, the stem of the valve joint (31) is provided with a second connection port (311), a mounting port (312), and a second water flow channel (313) in sequence from top to bottom; the bottom end of the central tube (1) is inserted into the second connection port (311) for fixation; a forward and reverse valve (32) is provided in the mounting port (312); the diameter of the second water flow channel (313) is smaller than the diameter of the mounting port (312); the valve core (321) is provided close to the second connection port (311); and the spring (322) is provided close to the second water flow channel (313).

[0016] Beneficial effect: By arranging the spring close to the second water flow channel and the diameter of the second water flow channel being smaller than the diameter of the installation opening, the spring can be limited.

[0017] Furthermore, a limit seat (314) is integrally fixed on the valve connector (31) near the top section of the valve core (321), and when not in operation, the valve core (321) is stuck in the limit seat (314).

[0018] Furthermore, two installation grooves (13) are fixed at intervals in the middle portion of the central tube (1), and a rubber cylinder assembly (5) is fixed between the two installation grooves (13).

[0019] Furthermore, a first connection port (11) is provided at the top end of the central tube (1), a first water flow channel (12) is provided in the shaft of the central tube (1), the first connection port (11) is connected to the first water flow channel (12), the diameter of the first connection port (11) is larger than the diameter of the first water flow channel (12), and an active drill rod is provided in the first connection port (11).

[0020] The present invention also discloses a method for performing a water pressure test using the non-drilling water pressure test device described in any of the above technical solutions, comprising the following steps:

[0021] S1 When the active drill rod (7) drives the common drill rod (6) to reach the water pressure end, a non-drilling water pressure test device is installed between the active drill rod (7) and the common drill rod (6), specifically: the top end of the central pipe (1) is connected to the output end of the active drill rod (7), and the bottom end of the valve system assembly (3) is connected to the common drill rod (6);

[0022] After the S2 drilling water pressure test device is lowered into the well, water is pressed through the active drill pipe; when the pressure is ≤3MPa, the forward and reverse valves (32) contact the output end of the central pipe (1), and the water pressure causes the rubber sleeve assembly (5) to gradually expand until it contacts the casing (9) inside the mine, thereby sealing the annular gap; when the pressure is greater than 3MPa, the forward and reverse valves (32) are separated from the output end of the central pipe (1), and the water flows into the valve joint (31) through the gap between the central pipe (1) and the forward and reverse valves (32), and then reaches the water pressure end through the ordinary drill pipe (6) to perform a water pressure test;

[0023] S3 After the water pressure test is completed, the active drill pipe (7) is separated from the central tube (1); the pressure in the mine is too high, causing water to flow back from the ordinary drill pipe (6), and the water flows through the internal opening of the valve joint (31) to push open the positive and negative valves (32) and enter the central tube (1), and finally flows back to the ground through the opening in the central tube (1), and the pressure relief is completed, and the rubber cylinder assembly (5) returns to its original state;

[0024] S4: Take out the non-drilling water pressure test device, connect the active drill rod (7) with the common drill rod (6), and continue drilling until the next water pressure end is reached, and repeat the above steps.

[0025] Beneficial effect: Through the setting of the positive and negative valves, it is possible to control whether the output end of the central pipe is in contact with the central pipe and whether the return flow can pass through the positive and negative valves according to the changes in the pressure in the mine, thereby controlling the expansion and contraction of the rubber cylinder assembly, and then achieving water pressure testing without drilling.

[0026] The advantages of the present invention are:

[0027] The present invention provides a center tube, a valve system assembly and a rubber cylinder assembly in a water pressure test device without drilling. Through the cooperation of the center tube, the valve system assembly and the rubber cylinder assembly, the center tube is connected with the valve system assembly. The valve system assembly is provided with a positive and negative valve capable of controlling the downstream and reflux of water flow. The middle part of the center tube is provided with a rubber cylinder assembly. When the water pressure is too high, the rubber cylinder assembly can expand to seal the mine, and can return to its original state when the water pressure returns to normal. Through the above arrangement, the water pressure test can be carried out without drilling.

[0028] The present invention can control whether the output end of the central tube contacts and whether the reflux can pass through the forward and reverse valves according to the change of the pressure in the mine by setting the forward and reverse valves, thereby controlling the expansion and contraction of the rubber cylinder assembly, and further realizing the water pressure test without drilling.

[0029] The present invention can reset the valve core by setting a spring.

[0030] The present invention can control the opening and closing of the interface between the first reflow channel and the second reflow channel by setting the reflow ball.

[0031] The present invention can limit the return flow ball by setting the limiting plate.

[0032] The present invention can limit the position of the spring by arranging the spring close to the second water flow channel and the diameter of the second water flow channel is smaller than the diameter of the installation opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a working schematic diagram of a non-drilling water pressure test device according to a first embodiment of the present invention;

[0034] Figure 2 It is a front view of a non-drilling water pressure test device according to a first embodiment of the present invention;

[0035] Figure 3 It is a front cross-sectional view of a non-drilling water pressure testing device according to a first embodiment of the present invention;

[0036] Figure 4 for Figure 3 A magnified view of middle;

[0037] Figure 5 for Figure 3 Enlarged view of B. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1

[0040] like Figure 1 , Figure 2 As shown, this embodiment provides a non-drilling water pressure test device, including a center pipe 1, a valve system assembly 3, and a rubber cylinder assembly 5.

[0041] like Figure 1 As shown, the center tube 1 is set with a central through opening; the bottom end of the center tube 1 is fixed with a valve system assembly 3; the middle part of the center tube 1 is fixed with a rubber cylinder assembly 5; when working, the bottom end of the valve system assembly 3 is connected to the ordinary drill rod 6, the top end of the center tube 1 is connected to the active drill rod 7, and the input end of the active drill rod 7 is connected to the power mechanism 8.

[0042] like Figure 3 , Figure 4As shown, the center tube 1 is a stepped cylindrical tube; two mounting grooves 13 are fixed at intervals in the middle part of the center tube 1, and a rubber tube assembly 5 is fixed between the two mounting grooves 13; a first connecting port 11 is opened at the top of the center tube 1, and a first water flow channel 12 is opened in the rod body of the center tube 1, and the first connecting port 11 is connected with the first water flow channel 12, and the diameter of the first connecting port 11 is larger than the diameter of the first water flow channel 12, and the first connecting port 11 is used for docking with the active drill pipe.

[0043] like Figure 3 , Figure 5 As shown, the valve system assembly 3 includes a valve joint 31 and a positive and negative valve 32; the valve joint 31 is a stepped cylindrical tube, and the diameter of the valve joint 31 decreases from top to bottom; the valve joint 31 is a central through opening, and the stem of the valve joint 31 is provided with a second connection port 311, a mounting port 312, and a second water flow channel 313 from top to bottom;

[0044] like Figure 3 , Figure 5 As shown, the diameter of the second connection port 311 is consistent with the diameter of the shaft of the central tube 1, and the bottom end of the central tube 1 is inserted into the second connection port 311 for fixation;

[0045] like Figure 3 , Figure 5 As shown, a positive and negative valve 32 is arranged in the installation port 312; the positive and negative valve 32 includes a valve core 321, a spring 322, and a reflux ball 323. The top of the valve core 321 contacts the bottom end of the central tube 1. A limit seat 314 is integrally fixed on the valve joint 31 near the top section of the valve core 321. When not working, the valve core 321 is stuck in the limit seat 314. The bottom end of the valve core 321 is provided with a spring 322. In this embodiment, the diameter of the bottom end of the valve core 321 is smaller than the diameter of the valve core 321 rod, and the spring 322 is sleeved on the bottom end of the valve core 321. The valve core 321 is set as a central through opening, and a first reflux channel 3211 and a second reflux channel 3212 are sequentially opened in the valve core 321 from top to bottom, and the diameter of the first reflux channel 3211 is larger than the diameter of the second reflux channel 3212; a semicircular groove is set at the interface of the first reflux channel 3211 and the second reflux channel 3212, and a reflux ball 323 is placed in the semicircular groove; a limit plate 3213 is fixed at the top of the first reflux channel 3211, and a plurality of openings are opened on the limit plate 3213 parallel to the reflux channel;

[0046] like Figure 3 , Figure 5 As shown, the diameter of the second water flow channel 313 is smaller than the diameter of the installation opening 312 .

[0047] like Figure 3 , Figure 4As shown, the rubber cylinder assembly 5 is made of multiple layers of high elasticity and high strength materials. In this embodiment, the rubber cylinder assembly 5 is made of three layers of stainless steel as the skeleton layer.

[0048] Working principle:

[0049] 1. Connect the input end of the active drill rod 7 to the power mechanism 8, and connect the output end of the active drill rod 7 to the common drill rod 6, which is a Φ89mm oil drill rod; then lower the common drill rod 6 into the mine through the active drill rod 7. When the common drill rod 6 reaches the water pressure end, install a non-drilling water pressure test device between the active drill rod 7 and the common drill rod 6, specifically: the top end of the central pipe 1 is connected to the active drill rod 7, and the bottom end of the valve system assembly 3 is connected to the common drill rod 6;

[0050] 2. After the drilling water pressure test device is lowered into the well, water is pressed through the active drill pipe; when the pressure is ≤3MPa, the valve core 321 contacts the central pipe 1 to block the first water flow channel 12, and the water pressure causes the rubber sleeve assembly 5 to gradually expand until it contacts the casing 9, sealing the annular gap; when the pressure is greater than 3MPa, the valve core 321 is separated from the central pipe 1, and the water flows into the installation port 312 and the second water flow channel 313 through the gap between the central pipe 1 and the valve core 321, and then reaches the water pressure end through the ordinary drill pipe 6 to carry out the water pressure test.

[0051] 3. When the water pressure test is completed, the active drill rod 7 is separated from the non-drilling water pressure test device; at this time, the pressure in the mine is too high, causing water to flow back from the ordinary drill rod 6, and the spring 322 will move upward to block the gap between the central tube 1 and the valve core 321, and the water flows through the second reflux channel 3212 to push the reflux ball 323 into the first reflux channel 3211, and then enter the central tube 1 through the opening in the limit plate 3213, and finally flow back to the ground through the first water flow channel 12 and the first connecting port 11, and the pressure relief is completed, and the rubber cylinder assembly 5 returns to its original state;

[0052] 4. Take out the non-drilling water pressure test device, connect the active drill rod 7 with the ordinary drill rod 6 and continue drilling until the next water pressure end is reached, and repeat the above steps.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-drilling water pressure test device, characterized in that: The invention comprises a central tube (1), a valve system assembly (3), and a rubber cylinder assembly (5); the central tube (1) is provided with a central through opening; the rubber cylinder assembly (5) is provided in the middle of the central tube (1), and the valve system assembly (3) is provided at the bottom end of the central tube (1); the valve system assembly (3) comprises a valve joint (31) and a positive and negative valve (32); the valve joint (31) is provided with a central through opening; the input end of the valve joint (31) is connected to the output end of the central tube (1); the positive and negative valve (32) is arranged in the valve joint (31) and contacts the output end of the central tube (1); the positive and negative valve (32) can control the forward flow and the reverse flow of water; the positive and negative valve (32) comprises a valve core (321) and a spring (322); the top end of the valve core (321) contacts the bottom end of the central tube (1), and the bottom end of the valve core (321) contacts the bottom end of the central tube (1). A spring (322) and a return ball (323) are arranged at the end of the valve core (321), the valve core (321) is arranged with a central through opening, and a first return channel (3211) and a second return channel (3212) are arranged in sequence from top to bottom in the valve core (321), and the diameter of the first return channel (3211) is larger than the diameter of the second return channel (3212); the return ball (323) is detachably connected at the interface of the first return channel (3211) and the second return channel (3212), and a semicircular groove is arranged at the interface of the first return channel (3211) and the second return channel (3212), and the return ball (323) is placed in the semicircular groove; a limiting plate (3213) is fixed at the top end of the first return channel (3211), and a plurality of openings are arranged on the limiting plate (3213) and are parallel to the return channel and through.

2. The non-drilling water pressure test device according to claim 1, characterized in that: The diameter of the bottom end of the valve core (321) is smaller than the diameter of the stem of the valve core (321), and the spring (322) is sleeved on the bottom end of the valve core (321).

3. The non-drilling water pressure test device according to claim 1, characterized in that: The stem of the valve joint (31) is provided with a second connection port (311), a mounting port (312), and a second water flow channel (313) in sequence from top to bottom; the bottom end of the central tube (1) is inserted into the second connection port (311) for fixation; a forward and reverse valve (32) is provided in the mounting port (312); the diameter of the second water flow channel (313) is smaller than the diameter of the mounting port (312); the valve core (321) is provided close to the second connection port (311); and the spring (322) is provided close to the second water flow channel (313).

4. The non-drilling water pressure test device according to claim 3, characterized in that: A limit seat (314) is integrally fixed on the valve connector (31) near the top section of the valve core (321); when not in operation, the valve core (321) is clamped in the limit seat (314).

5. The non-drilling water pressure test device according to claim 1, characterized in that: Two installation grooves (13) are fixed at intervals in the middle of the central tube (1), and a rubber cylinder assembly (5) is fixed between the two installation grooves (13).

6. The non-drilling water pressure test device according to claim 1, characterized in that: A first connection port (11) is provided at the top end of the central tube (1), a first water flow channel (12) is provided in the shaft of the central tube (1), the first connection port (11) is connected to the first water flow channel (12), the diameter of the first connection port (11) is larger than the diameter of the first water flow channel (12), and an active drill rod is arranged in the first connection port (11).

7. A method for performing a water pressure test using the non-drilling water pressure test device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1 When the active drill rod (7) drives the common drill rod (6) to reach the water pressure end, a non-drilling water pressure test device is installed between the active drill rod (7) and the common drill rod (6), specifically: the top end of the central pipe (1) is connected to the output end of the active drill rod (7), and the bottom end of the valve system assembly (3) is connected to the common drill rod (6); After the S2 drilling water pressure test device is lowered into the well, water is pressed through the active drill pipe; when the pressure is ≤3MPa, the forward and reverse valves (32) contact the output end of the central pipe (1), and the water pressure causes the rubber sleeve assembly (5) to gradually expand until it contacts the casing (9) inside the mine, thereby sealing the annular gap; when the pressure is greater than 3MPa, the forward and reverse valves (32) are separated from the output end of the central pipe (1), and the water flows into the valve joint (31) through the gap between the central pipe (1) and the forward and reverse valves (32), and then reaches the water pressure end through the ordinary drill pipe (6) to perform a water pressure test; S3 After the water pressure test is completed, the active drill pipe (7) is separated from the central tube (1); the pressure in the mine is too high, causing water to flow back from the ordinary drill pipe (6), and the water flows through the internal opening of the valve joint (31) to push open the positive and negative valves (32) and enter the central tube (1), and finally flows back to the ground through the opening in the central tube (1), and the pressure relief is completed, and the rubber cylinder assembly (5) returns to its original state; S4: Take out the non-drilling water pressure test device, connect the active drill rod (7) with the common drill rod (6), and continue drilling until the next water pressure end is reached, and repeat the above steps.

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