A mine hydraulic fracturing stress testing system
Patent Information
- Application Number
- CN202522379219.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-10
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-10
AI Technical Summary
[0003]由于在测试过程中需要提前将封隔器以及压裂管等部件送入钻孔的内部，而压裂管上所开设的压裂出水孔在向钻孔内部推送过程中容易被钻孔内部的大颗粒杂物所堵塞，从而影响后续的测试结果
本实用新型提出了一种矿用水压致裂应力测试系统，该测试系统通过高压泵提供动力将高压水输送至第一封隔器和第二封隔器，利用第一封隔器和第二封隔器在顶板钻孔内形成封闭的压裂区间，有效防止水压外泄，以确保测试的准确性；同时，压裂段注水管具有独特的结构设计，通过顶推板、滑套以及推移块的同轴装配在下壳体内部，配合上壳体侧壁的条形孔和挡块，能够在水压作用下实现自动调节，确保压裂出水孔始终保持畅通，避免传统测试系统中压裂出水孔易被钻孔内杂物堵塞的问题，保证测量的顺利进行；此外，每个输水支路上设置的压力变送器、流量计以及开关阀门，能够实时监测和调节水压和流量，确保测试过程的稳定性和可控性；在压裂区间设置的内部水压传感器，则能够进一步精确测量压裂区间内的水压变化，为岩体应力测量提供更加准确的数据支持。
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Figure CN224861426U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rock mass stress testing technology, specifically to a mine water pressure fracturing stress testing system. Background Technology
[0002] Hydraulic fracturing is a direct method for testing geostress. It involves using a pair of expandable rubber packers to seal a section of exposed rock at a selected measurement depth. Fluid is then pumped into this section of the borehole to increase pressure, which continues to rise until the surrounding rock fractures. Further pressure is applied to propagate the fracture. During fracturing, the changes in pressure and flow rate over time are recorded, and the magnitude of the principal stresses can be determined from the pressure-time curve.
[0003] During the testing process, components such as packers and fracturing pipes need to be inserted into the borehole in advance. However, the fracturing water outlet holes on the fracturing pipes are easily blocked by large particles of debris inside the borehole during the pushing process, which affects the subsequent test results.
[0004] Therefore, this utility model proposes a water pressure fracturing stress testing system for mines. Utility Model Content
[0005] The purpose of this invention is to propose a water pressure fracturing stress testing system for mines. This stress testing system improves the structural design to prevent the fracturing water outlet from being blocked, ensuring the accuracy of the measurement results and the smooth progress of the test. It can provide more accurate data support for rock mass stress measurement by measuring the water pressure changes in the fracturing zone.
[0006] To achieve the above objectives, this utility model adopts the following technical solution: A water-pressure fracturing stress testing system for mines includes a water storage tank, a high-pressure pump, a first packer, a first high-pressure pipeline, a water injection pipe for the fracturing section, a second high-pressure pipeline, and a second packer. The first packer, the first high-pressure pipeline, the fracturing section water injection pipe, the second high-pressure pipeline, and the second packer are all installed inside the borehole in the top plate. The outlet of the water storage tank is connected to the inlet of the high-pressure pump, and the outlet of the high-pressure pump is connected to multiple water transmission branches. Each water transmission branch is connected to one end of the first high-pressure pipeline, and the other end of the first high-pressure pipeline passes through the first packer and is connected to the inside of the fracturing section water injection pipe. One end of the second high-pressure pipeline is located inside the water injection pipe of the fracturing section, and the other end of the second high-pressure pipeline is connected to the inside of the second packer.
[0007] Preferably, the fracturing section water injection pipe includes a lower shell and an upper shell, both of which are hollow and interconnected, and the second high-pressure pipeline is vertically arranged on the central axis of the lower shell and the upper shell; The lower housing has a push plate inside, and a sliding sleeve is provided on the top of the push plate. The outer wall of the sliding sleeve is slidably connected to the inner wall of the lower housing. A push block is provided on the top of the sliding sleeve. The upper part of the push block is inserted into the upper housing, and the upper contour of the push block is frustum-shaped. The upper housing has a strip-shaped hole on its side wall, and a stop block is provided inside the strip-shaped hole. The stop block has an inclined surface that matches the upper contour of the push block. The side walls of both the upper housing and the stop block have slots, and annular springs are provided inside the slots.
[0008] Preferably, the portion of the first high-pressure pipeline located inside the first packer has a packing outlet, and the portion of the second high-pressure pipeline located inside the upper housing has a fracturing outlet.
[0009] Preferably, the push plate, the sliding sleeve, and the pushing block are all coaxially assembled.
[0010] Preferably, each water transmission branch is equipped with a pressure transmitter, a flow meter, and a switch valve, and the pressure transmitter and flow meter are connected to a data acquisition instrument.
[0011] Preferably, an internal water pressure sensor is provided between the first packer and the second packer, and the internal water pressure sensor is connected to the data acquisition instrument.
[0012] Preferably, both the first and second packers are rubber packers.
[0013] The beneficial effects of this utility model are as follows: This invention proposes a mine water pressure fracturing stress testing system. The system uses a high-pressure pump to deliver high-pressure water to a first and second packer. These packers form a closed fracturing zone within the borehole in the roof, effectively preventing water pressure leakage and ensuring test accuracy. Simultaneously, the fracturing section's water injection pipe features a unique structural design. Through a coaxial assembly of a pusher plate, sliding sleeve, and shifting block inside the lower housing, and in conjunction with the strip-shaped holes and baffles on the upper housing's sidewall, it can automatically adjust under water pressure, ensuring the fracturing water outlet remains unobstructed. This avoids the problem of the fracturing water outlet being easily blocked by debris in the borehole in traditional testing systems, guaranteeing smooth measurement. Furthermore, pressure transmitters, flow meters, and switching valves installed on each water supply branch can monitor and adjust water pressure and flow in real time, ensuring the stability and controllability of the testing process. An internal water pressure sensor installed within the fracturing zone can further accurately measure water pressure changes within the fracturing zone, providing more accurate data support for rock mass stress measurement. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall connection relationship of this utility model; Figure 2 This is a partial structural diagram of the present invention inside a borehole; Figure 3 This is a schematic diagram of the structure of the fracturing section water injection pipe of this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the fracturing section water injection pipe of this utility model. Figure 2 ; Figure 5 This is a schematic diagram of the structure of the fracturing section water injection pipe of this utility model. Figure 3 ; Figure 6 This is a schematic diagram of the structure of the second high-pressure pipeline of this utility model; Figure 7 This diagram illustrates the high-pressure water flow direction of the fracturing section water injection pipe of this utility model. Figure 1 ; Figure 8 This diagram illustrates the high-pressure water flow direction of the fracturing section water injection pipe of this utility model. Figure 2 ; Among them, 1-water storage tank, 2-high pressure pump; 30-Data acquisition instrument, 31-Pressure transmitter, 32-Flow meter, 33-Internal water pressure sensor; 4-Water supply branch, 41-Switch valve; 51-First high-pressure pipeline, 52-Second high-pressure pipeline, 521-Fracturing outlet; 61-First packer, 62-Second packer; 7-Fracturing section water injection pipe; 71-Lower shell; 711-Push plate; 712-Sliding sleeve; 713-Push block; 72-Upper housing; 721-Stop; 722-Annular spring; 8-Top plate, 81-Drill hole. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0016] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0017] Combination Figures 1 to 8 As shown, this utility model proposes a water pressure fracturing stress testing system for mines. This testing system, through improved structural design, prevents the fracturing water outlet 521 from being blocked, ensuring the accuracy of measurement results and the smooth progress of the test. It can provide more accurate data support for rock mass stress measurement by measuring water pressure changes within the fracturing zone. The testing system includes a water storage tank 1, a high-pressure pump 2, a first packer 61, a first high-pressure pipeline 51, a fracturing section water injection pipe 7, a second high-pressure pipeline 52, and a second packer 62, among other structural components. The first packer 61, the first high-pressure pipeline 51, the fracturing section water injection pipe 7, the second high-pressure pipeline 52, and the second packer 62 are all located inside the borehole 81 of the top plate 8.
[0018] Combination Figure 1 As shown, the outlet of the water storage tank 1 is connected to the inlet of the high-pressure pump 2, and the outlet of the high-pressure pump 2 is connected to multiple water supply branches 4. Each water supply branch 4 is independent of each other and does not affect the others, and each can start the test process independently.
[0019] Each water supply branch 4 is connected to one end of the first high-pressure pipeline 51, and the other end of the first high-pressure pipeline 51 passes through the first packer 61 and is connected to the interior of the fracturing section water injection pipe 7. This utility model provides high-pressure water through the high-pressure pump 2, which is delivered into the fracturing section water injection pipe 7 through the water supply branch 4 and the first high-pressure pipeline 51.
[0020] One end of the second high-pressure pipeline 52 is located inside the water injection pipe 7 of the fracturing section, and the other end of the second high-pressure pipeline 52 is connected to the inside of the second packer 62, so that high-pressure water can be injected into the first packer 61 and the second packer 62, and finally a closed fracturing zone is formed in the borehole 81.
[0021] Combination Figures 3 to 5 As shown, the fracturing section water injection pipe 7 mainly includes a lower shell 71 and an upper shell 72. The upper shell 72 is set on the top of the lower shell 71, and the interiors of the lower shell 71 and the upper shell 72 are hollow and interconnected. The second high-pressure pipeline 52 is vertically set on the central axis of the lower shell 71 and the upper shell 72.
[0022] Combination Figures 2 to 4 As shown, the other end of the first high-pressure pipeline 51 is connected to the interior of the lower housing 71. A push plate 711 is provided inside the lower housing 71. A sliding sleeve 712 is provided on the top of the push plate 711. The outer wall of the sliding sleeve 712 is slidably connected to the inner wall of the lower housing 71. A push block 713 is provided on the top of the sliding sleeve 712. The upper part of the push block 713 is inserted into the interior of the upper housing 72, and the upper contour of the push block 713 is frustum-shaped.
[0023] Combination Figures 2 to 5 As shown, a strip-shaped hole is formed in the side wall of the upper housing 72. A stop block 721 is provided inside the strip-shaped hole. The stop block 721 has an inclined surface that matches the upper contour of the push block 713. A slot is formed in the side wall of the upper housing 72 and the stop block 721, and a ring spring 722 is provided inside the slot. When the high-pressure water flow impacts the push plate 711, the push plate 711 can push the sliding sleeve 712 and the push block 713 to move upward. The frustum-shaped upper part of the push block 713 interacts with the inclined surface of the stop block 721, causing the stop block 721 to move within the strip-shaped hole. At the same time, the ring spring 722 can play an adjustment and reset role to ensure the stability of the structure.
[0024] Combination Figure 6 As shown, the first high-pressure pipeline 51, located inside the first packer 61, has a packer outlet hole in its portion, and the second high-pressure pipeline 52, located inside the upper housing 72, has a fracturing outlet hole 521 in its portion. The packer outlet hole and fracturing outlet hole 521 allow high-pressure water to flow out at specific locations, achieving both packing and hydraulic fracturing functions. The push plate 711, sliding sleeve 712, and push block 713 are all coaxially assembled, ensuring the coordination of movement between components and improving the reliability of the system.
[0025] Specifically, combined Figure 7As shown, when the high-pressure pump 2 and valve 41 are turned on, the high-pressure water will pass through the water supply branch 4, the first high-pressure pipeline 51 and the second high-pressure pipeline 52 in sequence. Since the stop block 721 is restricted by the elastic force of the ring spring 722, the high-pressure water will first flow to the first packer 61 and the second packer 62, filling the first packer 61 and the second packer 62 with water and sticking tightly to the inner wall of the borehole 81, forming a closed fracturing zone in the borehole 81 of the top plate 8.
[0026] Combination Figure 8 As shown, with further increases in water pressure, the jacking plate 711 is pushed upwards by the high-pressure water flow, causing the sliding sleeve 712 and the pushing block 713 to move upwards. The frustum-shaped upper part of the pushing block 713 interacts with the inclined surface of the stop block 721, causing the stop block 721 to move and be pushed out within the strip-shaped hole. At this time, high-pressure water is ejected from the fracturing outlet hole 521 of the second high-pressure pipeline 52, performing water pressure fracturing on the rock mass within the fracturing zone. When the water pressure continues to increase, the pushing block 713 can push the stop block 721 to continue moving outwards, thereby expanding the water outlet area of the fracturing outlet hole 521 and ensuring that the high-pressure water can be ejected smoothly.
[0027] After the test is completed, the high-pressure pump 2 and the switch valve 41 are turned off. The elastic force of the ring spring 722 and the external water pressure can make the stop block 721 move inward to block the water from the fracturing outlet hole 521. At the same time, it can also prevent large particles of debris from entering the borehole 81, prevent the fracturing outlet hole 521 from becoming blocked, and ensure the smooth progress of the measurement.
[0028] This invention, by improving the structure of the fracturing section water injection pipe 7 and simplifying the pipeline connection, not only reduces potential leakage points in the pipeline connection and improves the system's sealing and reliability, but also makes the layout of the entire testing system within the borehole 81 more compact and reasonable. The unique design of the lower shell 71 and upper shell 72, combined with the coordinated work of the push plate 711, sliding sleeve 712, and push block 713, realizes the automatic adjustment function under water pressure. This automatic adjustment mechanism can adjust the opening degree of the fracturing water outlet 521 in real time according to changes in water pressure, thereby ensuring that high-pressure water can be ejected in the best state under different water pressure conditions, effectively fracturing the rock mass.
[0029] Combination Figure 1 As shown, each water supply branch 4 is equipped with a pressure transmitter 31, a flow meter 32, and a switching valve 41. The pressure transmitter 31 and flow meter 32 are both connected to a data acquisition instrument 30. The pressure transmitter 31 can monitor the water pressure in the water supply branch 4 in real time, the flow meter 32 can monitor the water flow rate in real time, and the data acquisition instrument 30 can collect and record these data for subsequent analysis and processing. The switching valve 41 can control the on / off state of the water supply branch 4, achieving flexible control of the water flow.
[0030] Combination Figure 2 As shown, an internal water pressure sensor 33 is installed between the first packer 61 and the second packer 62, and the internal water pressure sensor 33 is connected to the data acquisition instrument 30. The internal water pressure sensor 33 can accurately measure the water pressure changes within the fracturing zone and transmit the data to the data acquisition instrument 30, providing more accurate data support for rock mass stress measurement. Both the first packer 61 and the second packer 62 are rubber packers. Rubber material has good sealing and elasticity, which can better adapt to the shape of the borehole 81 and improve the sealing effect.
[0031] Combination Figures 1 to 8 As shown, this utility model proposes a mine water pressure fracturing stress testing system. This system uses a high-pressure pump 2 to deliver high-pressure water to the first packer 61 and the second packer 62. The first and second packers 61 and 62 form a closed fracturing zone within the borehole 81 in the top plate 8, effectively preventing water pressure leakage and ensuring test accuracy. Simultaneously, the unique structural design of the fracturing section water injection pipe 7, through the coaxial assembly of the push plate 711, sliding sleeve 712, and push block 713 inside the lower shell 71, combined with the strip-shaped hole on the side wall of the upper shell 72 and its internal stop block 721, enables automatic adjustment under water pressure, ensuring the fracturing water outlet remains unobstructed. This avoids the problem of the fracturing water outlet being easily blocked by debris in the borehole in traditional testing systems, ensuring smooth testing. Furthermore, the pressure transmitter 31, flow meter 32, and switch valve 41 installed on each water supply branch can monitor and adjust water pressure and flow rate in real time, ensuring the stability and controllability of the testing process. The internal water pressure sensor 33 installed in the fracturing zone can further accurately measure the water pressure changes within the fracturing zone, providing operators with precise data support so they can adjust test parameters according to actual conditions and ensure the smooth progress of the test. In summary, the mine water pressure fracturing stress testing system proposed in this utility model has advantages such as compact structure, simple operation, and accurate measurement, and has broad application prospects.
[0032] Of course, the above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model and should be protected by the present utility model.
Claims
1. A hydraulic fracturing stress testing system for mines, characterized in that, It includes a water storage tank, a high-pressure pump, a first packer, a first high-pressure pipeline, a fracturing section water injection pipe, a second high-pressure pipeline, and a second packer; The first packer, the first high-pressure pipeline, the fracturing section water injection pipe, the second high-pressure pipeline, and the second packer are all installed inside the borehole in the top plate. The outlet of the water storage tank is connected to the inlet of the high-pressure pump, and the outlet of the high-pressure pump is connected to multiple water transmission branches. Each water transmission branch is connected to one end of the first high-pressure pipeline, and the other end of the first high-pressure pipeline passes through the first packer and is connected to the inside of the fracturing section water injection pipe. One end of the second high-pressure pipeline is located inside the water injection pipe of the fracturing section, and the other end of the second high-pressure pipeline is connected to the inside of the second packer.
2. The mine hydraulic fracturing stress testing system according to claim 1, characterized in that, The fracturing section water injection pipe includes a lower shell and an upper shell. The interiors of the lower shell and the upper shell are hollow and interconnected. The second high-pressure pipeline is vertically arranged on the central axis of the lower shell and the upper shell. The lower housing has a push plate inside, and a sliding sleeve is provided on the top of the push plate. The outer wall of the sliding sleeve is slidably connected to the inner wall of the lower housing. A push block is provided on the top of the sliding sleeve. The upper part of the push block is inserted into the upper housing, and the upper contour of the push block is frustum-shaped. The upper housing has a strip-shaped hole on its side wall, and a stop block is provided inside the strip-shaped hole. The stop block has an inclined surface that matches the upper contour of the push block. The side walls of both the upper housing and the stop block have slots, and annular springs are provided inside the slots.
3. The mine hydraulic fracturing stress testing system according to claim 2, characterized in that, The first high-pressure pipeline has a sealing outlet hole in the part of the pipeline located inside the first packer, and the second high-pressure pipeline has a fracturing outlet hole in the part of the pipeline located inside the upper shell.
4. The mine hydraulic fracturing stress testing system according to claim 2, characterized in that, The push plate, sliding sleeve, and pushing block are all coaxially assembled.
5. The mine hydraulic fracturing stress testing system according to claim 1, characterized in that, Each water transmission branch is equipped with a pressure transmitter, a flow meter, and a switch valve. The pressure transmitter and flow meter are connected to a data acquisition instrument.
6. The mine hydraulic fracturing stress testing system according to claim 5, characterized in that, An internal water pressure sensor is provided between the first packer and the second packer, and the internal water pressure sensor is connected to a data acquisition instrument.
7. The mine hydraulic fracturing stress testing system according to claim 1, characterized in that, Both the first and second packers are rubber packers.