Permeability measuring device based on coupling of artificial fracture and natural fracture

Abstract

The invention relates to the technical field of rock permeability, in particular to a permeability measuring device based on coupling of an artificial fracture and a natural fracture, and solves the problems that when permeability measurement is carried out on rock with coupling of the artificial fracture and the natural fracture in the prior art, peripheral pressure borne by the rock in a rock stratum cannot be simulated, and the permeability of the rock cannot be measured. The problems that the permeability cannot be accurately measured, penetrating fluid cannot be uniformly pressurized according to the size of a rock sample, and the seepage effect of the penetrating fluid is poor are solved. A permeability measuring device based on coupling of an artificial fracture and a natural fracture comprises a circulating fluid infusion mechanism, a sealed transmission mechanism and a sample storage mechanism, the sample storage mechanism is installed on the inner side of the upper end of the circulating fluid infusion mechanism, and the sealed transmission mechanism is installed at the upper end of the sample storage mechanism. According to the invention, by uniformly pressurizing the rock sample and the penetrating fluid, the peripheral pressure of the rock in the rock stratum can be effectively simulated, so that the accuracy of permeability measurement is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rock permeability, in particular to a permeability measurement device based on the coupling of artificial fractures and natural fractures. Background Art

[0002] Artificial fractures in rock formations have a good coupling effect with natural fractures. The coupling effect between artificial fractures and natural fractures has a significant impact on the permeability of rocks. By in-depth research on their interaction mechanism and optimizing mining strategies, the development efficiency and recovery rate of oil and gas fields can be effectively improved. Permeability is one of the most important parameters in the study of reservoir physical properties. The permeability measurement under the coupling of artificial fractures and natural fractures is an important research field. Especially in the development of oil and gas fields, understanding the interaction between these two fractures is of great significance to improving the recovery rate. The measurement of core permeability is an indispensable task for reservoir evaluation, development plan design, numerical simulation and production capacity rating.

[0003] The existing permeability measurement of rocks with artificial fractures coupled with natural fractures cannot simulate the peripheral pressure of the rocks in the rock formations, and thus the permeability cannot be accurately measured. It is also inconvenient to uniformly pressurize the permeate according to the size of the rock sample, and the permeate seepage effect is poor. Therefore, it does not meet the existing needs. In this regard, we propose a permeability measurement device based on the coupling of artificial fractures and natural fractures. Summary of the invention

[0004] The purpose of the present invention is to provide a permeability measuring device based on the coupling of artificial fractures and natural fractures, so as to solve the problems raised in the above background technology that when measuring the permeability of rocks with artificial fractures and natural fractures, the surrounding pressure of the rocks in the rock formations cannot be simulated, and the permeability cannot be accurately measured, and it is not convenient to uniformly pressurize the permeate according to the size of the rock sample, resulting in poor permeate seepage effect.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A permeability measurement device based on the coupling of artificial fractures and natural fractures, comprising a circulating fluid replenishment mechanism, a sealing transmission mechanism and a sample storage mechanism, wherein the sample storage mechanism is installed on the inner side of the upper end of the circulating fluid replenishment mechanism, the sealing transmission mechanism is installed on the upper end of the sample storage mechanism, the protective pressurization mechanism is installed on the upper end of the sealing transmission mechanism, the circulating fluid replenishment mechanism comprises a supporting bottom box, a plurality of supporting frames are fixedly installed on the middle part of the upper end surface of the supporting bottom box, a mounting cylinder is installed on the inner side of the upper ends of the plurality of supporting frames, a supporting hollow disk is fixedly installed on the inner side of the bottom end of the mounting cylinder, and a monitoring shell is fixedly installed on the inner side of the supporting hollow disk;

[0007] The sealing transmission mechanism comprises a sealing disc, which is slidably connected to the mounting cylinder, a lower pressing seat is fixedly mounted on the inner side of the sealing disc, a transmission sheet is fixedly mounted on the upper end of the lower pressing seat, two pressing rings are mounted on the outer side of the sealing disc, and a sealing ring is arranged on the outer side of the pressing ring;

[0008] The sample storage mechanism includes a storage test cylinder, which is slidably connected to the mounting cylinder. A limiting ring is installed on the upper end of the storage test cylinder. An isolation disk is slidably connected to the inner side of the storage test cylinder. A central collecting hole is provided on the inner side of the middle part of the isolation disk. A flow pump is fixedly installed in the middle of the upper end surface of the isolation disk.

[0009] Preferably, the circulating fluid replenishment mechanism also includes a positioning ring fixedly connected to the mounting cylinder, a plurality of locking knobs are provided on the outer side of the positioning ring, a filter box is fixedly installed on the front end surface of the supporting bottom box, a liquid storage tank is fixedly installed on the inner side of the supporting bottom box, an impurity water storage chamber is provided between the supporting bottom box and the liquid storage tank, a reflux pipe is installed on the inner side of the impurity water storage chamber, a locking sleeve is movably installed on the outer side of the upper end of the reflux pipe, a distilled water storage chamber is provided inside the liquid storage tank, a booster pump is installed on the inner side of the distilled water storage chamber, and a flow meter is fixedly installed on the output end of the booster pump.

[0010] Preferably, the protective boost mechanism includes an installation box, which is fixedly connected to the supporting bottom box, a control panel is fixedly installed on one side of the installation box, an air pump is fixedly installed on the inner wall of the rear side of the installation box, a transparent cover plate is fixedly installed on the front end surface of the installation box, a movable door is rotatably connected to the front end surface of the transparent cover plate, two guide frames are fixedly installed on the inner side of the upper end of the installation box, a second hydraulic cylinder is fixedly installed on the lower end surface of one of the guide frames, a cylinder mounting seat is slidably connected between the two guide frames, and a first hydraulic cylinder is fixedly installed on the inner side of the middle part of the cylinder mounting seat.

[0011] Preferably, the upper ends of the multiple support frames are inserted between the mounting tube and the positioning ring, one end of the locking knob passes through the positioning ring and is threadedly connected to the upper end of the support frame, the multiple support frames are fixedly connected to the positioning ring and the mounting tube through the mounting tube, the bottom end of the storage and test tube is inserted into the inner side of the mounting tube and is in close contact with the upper end surface of the supporting hollow disk, and the lower end surface of the storage and test tube is provided with multiple micro holes.

[0012] Preferably, the interior of the distilled water storage chamber is filled with distilled water, the booster pump is fixedly connected to the liquid storage tank, the input end of the booster pump is through-connected to the distilled water storage chamber, and the output end of the booster pump passes through the liquid storage tank, the supporting bottom box and the mounting cylinder and is through-connected to the flow meter.

[0013] Preferably, a rock sample is provided between the storage and test cylinder and the isolation disk, the upper end of the storage and test cylinder is connected to the limit ring by threads, the bottom end of the lower pressure seat is in close contact with the upper end surface of the isolation disk, and the sealing disk is connected to the mounting cylinder by two sealing rings.

[0014] Preferably, the inner wall of the central collecting hole is provided with a plurality of waist-shaped guide holes, the input end of the flow pump is plugged into the inner side of the central collecting hole, one end of the locking sleeve passes through the mounting tube and is threadedly connected to the output end of the flow pump, sealing rings are provided between the locking sleeve, the return pipe and the mounting tube, the output end of the flow pump passes through the lower pressure seat and is fixedly connected to the upper end of the return pipe through the locking sleeve, and the output end of the flow pump is connected to the impurity water storage chamber through the return pipe.

[0015] Preferably, the output end of the air pump is plugged between the sealing disk and the isolation disk and fixedly connected to the sealing disk, and the booster pump, air pump, first hydraulic cylinder, second hydraulic cylinder and flow pump are all electrically connected to the control panel.

[0016] Preferably, the output end of the second hydraulic cylinder passes through one of the guide frames and is fixedly connected to the cylinder mounting seat, both ends of the cylinder mounting seat are slidably connected to the two guide frames, and the output end of the first hydraulic cylinder is fixedly connected to the lower pressure seat through a transmission plate.

[0017] Preferably, a liquid level gauge and a pressure sensor are respectively provided on the inner sides of the upper and lower ends of the monitoring shell, a wireless transmission module is provided between the liquid level gauge and the pressure sensor, and the flow meter, liquid level gauge, pressure sensor and wireless transmission module are all electrically connected to the control panel.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention uses a booster pump to transport the distilled water in the distilled water storage chamber to the inner side of the installation cylinder, so that the lower end surface of the storage test cylinder fits with the water surface of the distilled water inside the bottom of the installation cylinder, avoiding the presence of air between the lower end surface of the storage test cylinder and the inner side of the bottom of the installation cylinder when the distilled water is subsequently pressurized, resulting in inaccurate measurement. The second hydraulic cylinder drives the first hydraulic cylinder to move downward through the cylinder mounting seat, and then the first hydraulic cylinder synchronously drives the lower pressure seat and the sealing plate to move downward to the inner side of the upper end of the installation cylinder through the transmission plate. The air pump injects air and pressurizes between the sealing plate and the isolation plate to achieve pressure simulation of artificial cracks and natural cracks in rock samples.

[0020] 2. The present invention presses down the isolation plate through the transmission plate and the lower pressure seat by the first hydraulic cylinder, thereby simulating the pressure environment of the rock sample in the rock formation, ensuring the accuracy of the permeability measurement of the rock sample. The booster pump replenishes and pressurizes the distilled water between the storage test cylinder and the installation cylinder, ensuring that the bottom of the rock is in uniform contact with the pressurized distilled water, improving the permeability uniformity, and the distilled water can be pressurized into the rock sample through the diversion at the bottom of the storage test cylinder, thereby realizing the permeability measurement operation of the rock sample under different pressure environments;

[0021] 3. The present invention can collect the impure water after the distilled water penetrates the rock sample through the central collecting hole. The permeability of the rock sample under the coupling of artificial fractures and natural fractures can be obtained by monitoring the amount extracted by the flow pump from the central collecting hole through the control panel. The measurement is accurate and is not interfered by the outflow of water from between the storage test cylinder and the isolation plate. The sealing transmission mechanism is reset by the first hydraulic cylinder and the output end of the flow pump is separated from the locking sleeve, so that the rock sample can be easily taken out and replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the installation structure of the installation tube of the present invention;

[0024] Figure 3 It is a schematic cross-sectional structure diagram of the present invention as a whole;

[0025] Figure 4 It is a structural schematic diagram of the protective boosting mechanism of the present invention;

[0026] Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure of the middle C area;

[0027] Figure 6 For the present invention Figure 3 Schematic diagram of the enlarged structure of the A area in the middle;

[0028] Figure 7 For the present invention Figure 3 Schematic diagram of the enlarged structure of the middle B area;

[0029] Figure 8 It is a schematic diagram of the explosion structure of the sealing transmission mechanism of the present invention;

[0030] Fig. 9 It is a schematic diagram of the explosion structure of the sample storage mechanism of the present invention.

[0031] In the figure: 1. Circulation and replenishment mechanism; 101. Support bottom box; 102. Filter box; 103. Support frame; 104. Positioning ring; 105. Locking knob; 106. Mounting cylinder; 107. Liquid storage tank; 108. Booster pump; 109. Flow meter; 110. Reflux pipe; 111. Distilled water storage chamber; 112. Impurity water storage chamber; 113. Support hollow disk; 114. Locking sleeve; 115. Monitoring shell; 2. Protective booster mechanism; 201. Mounting box; 202. Control surface Plate; 203, transparent sealing plate; 204, movable door; 205, cylinder mounting seat; 206, air pump; 207, first hydraulic cylinder; 208, second hydraulic cylinder; 209, guide frame; 3, sealing transmission mechanism; 301, sealing disk; 302, transmission plate; 303, lower pressure seat; 304, pressure ring; 305, sealing ring; 4, sample storage mechanism; 401, storage test tube; 402, isolation plate; 403, limit ring; 404, flow pump; 405, central collecting hole. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] The booster pump 108 (model MDZ-20-180), air pump 206 (model ZYBW80E), first hydraulic cylinder 207 (model HOB80X250-100), second hydraulic cylinder 208 (model SJYG70-1000) and flow pump 404 (model IS200-150-400) mentioned in the present invention can all be purchased from the market or customized.

[0034] See also Figures 1 to 7 , an embodiment of the present invention: a permeability measuring device based on the coupling of artificial fractures and natural fractures, comprising a circulating fluid replenishment mechanism 1, a sealing transmission mechanism 3 and a sample storage mechanism 4, the circulating fluid replenishment mechanism 1 comprises a supporting bottom box 101, a plurality of supporting frames 103 are fixedly installed in the middle of the upper end surface of the supporting bottom box 101, a mounting tube 106 is installed on the inner side of the upper ends of the plurality of supporting frames 103, a positioning ring 104 is fixedly connected to the outer side of the bottom end of the mounting tube 106, a plurality of locking knobs 105 are arranged on the outer side of the positioning ring 104, the upper ends of the plurality of supporting frames 103 are all inserted between the mounting tube 106 and the positioning ring 104, one end of the locking knob 105 passes through the positioning ring 104 and is connected to the upper end of the supporting frame 103 by a thread, the plurality of supporting frames 103 are fixedly connected to the positioning ring 104 and the mounting tube 106 by the mounting tube 106, and the mounting tube 106 and the plurality of supporting frames 103 are conveniently disassembled and assembled by the locking knob 105;

[0035] A supporting hollow disk 113 is fixedly installed on the inner side of the bottom end of the mounting tube 106, and a monitoring shell 115 is fixedly installed on the inner side of the supporting hollow disk 113. A liquid level gauge and a pressure sensor are respectively provided on the inner sides of the upper and lower ends of the monitoring shell 115. A wireless transmission module is provided between the liquid level gauge and the pressure sensor, so that the liquid level and water pressure before and after the pressurized penetration of the distilled water can be monitored conveniently through the liquid level gauge and the pressure sensor.

[0036] A filter box 102 is fixedly installed on the front end surface of the support bottom box 101, a liquid storage tank 107 is fixedly installed on the inner side of the support bottom box 101, and an impurity water storage chamber 112 is provided between the support bottom box 101 and the liquid storage tank 107. The interior of the distilled water storage chamber 111 is filled with distilled water. The impurity water in the impurity water storage chamber 112 can be filtered by the filter box 102 and transported to the distilled water storage chamber 111, so as to realize the recycling of the distilled water.

[0037] A return pipe 110 is installed on the inner side of the impurity water storage chamber 112, and a locking sleeve 114 is movably installed on the outer side of the upper end of the return pipe 110. A distilled water storage chamber 111 is provided inside the liquid storage tank 107, and a booster pump 108 is installed on the inner side of the distilled water storage chamber 111. A flow meter 109 is fixedly installed on the output end of the booster pump 108. The booster pump 108 is fixedly connected to the liquid storage tank 107, and the input end of the booster pump 108 is connected through the distilled water storage chamber 111. The output end of the booster pump 108 passes through the liquid storage tank 107, the supporting bottom box 101 and the mounting cylinder 106 and is connected through the flow meter 109. The booster pump 108 replenishes and pressurizes the distilled water between the test cylinder 401 and the mounting cylinder 106, so as to realize the permeability measurement operation of the rock sample under different pressure environments.

[0038] See also Figures 4 to 8 A sample storage mechanism 4 is installed on the inner side of the upper end of the circulating fluid replenishment mechanism 1, and a sealing transmission mechanism 3 is installed on the upper end of the sample storage mechanism 4. The sealing transmission mechanism 3 includes a sealing disk 301, and the sealing disk 301 is slidably connected to the mounting tube 106. A lower pressure seat 303 is fixedly installed on the inner side of the sealing disk 301, and a transmission sheet 302 is fixedly installed on the upper end of the lower pressure seat 303. Two pressure rings 304 are installed on the outer side of the sealing disk 301, and a sealing ring 305 is provided on the outer side of the pressure ring 304. The sealing disk 301 is connected to the mounting tube 106 through two sealing rings 305, and is sealed by the sealing ring 305 to facilitate the stability of gas injection and pressurization.

[0039] See also Figures 5 to 9The sample storage mechanism 4 includes a storage test cylinder 401, which is slidably connected to the mounting cylinder 106. The bottom end of the storage test cylinder 401 is inserted into the inner side of the mounting cylinder 106 and is in close contact with the upper end surface of the supporting hollow disk 113. The lower end surface of the storage test cylinder 401 is provided with a plurality of micro holes, which facilitates the storage of rock samples and the uniform distilled water diversion through the storage test cylinder 401.

[0040] A limit ring 403 is installed at the upper end of the storage test cylinder 401, and an isolation disk 402 is slidably connected to the inner side of the storage test cylinder 401. A rock sample is arranged between the storage test cylinder 401 and the isolation disk 402. The upper end of the storage test cylinder 401 is connected to the limit ring 403 by threads, and the bottom end of the lower pressure seat 303 is in close contact with the upper end surface of the isolation disk 402. A central collecting hole 405 is arranged on the inner side of the middle part of the isolation disk 402. The central collecting hole 405 can collect the impurity water after the distilled water infiltrates the rock sample, and is not disturbed by the water flowing out from between the storage test cylinder 401 and the isolation disk 402.

[0041] A flow pump 404 is fixedly installed in the middle of the upper end surface of the isolation disk 402, and a plurality of waist-shaped flow guide holes are provided on the inner wall of the central collecting hole 405. The input end of the flow pump 404 is plugged into the inner side of the central collecting hole 405. One end of the locking sleeve 114 passes through the installation tube 106 and is connected to the output end of the flow pump 404 by a thread. A sealing ring is provided between the locking sleeve 114, the return pipe 110 and the installation tube 106. The output end of the flow pump 404 passes through the lower pressure seat 303 and is fixedly connected to the upper end of the return pipe 110 by the locking sleeve 114. The output end of the flow pump 404 is connected to the impurity water storage chamber 112 through the return pipe 110. The permeability of the rock sample under the coupling of artificial fractures and natural fractures can be obtained by monitoring the amount extracted by the flow pump 404 from the central collecting hole 405, and the measurement is accurate.

[0042] The output end of the air pump 206 is plugged between the sealing disk 301 and the isolation disk 402 and fixedly connected to the sealing disk 301. The booster pump 108, the air pump 206, the first hydraulic cylinder 207, the second hydraulic cylinder 208 and the flow pump 404 are all electrically connected to the control panel 202. The control panel 202 facilitates real-time display and regulation of various parameters of the osmotic pressure measurement process.

[0043] See also Figures 1 to 5A protective pressurizing mechanism 2 is installed at the upper end of the sealing transmission mechanism 3, and the protective pressurizing mechanism 2 includes an installation box 201, and the installation box 201 is fixedly connected to the supporting bottom box 101. A control panel 202 is fixedly installed on one side of the installation box 201. The flow meter 109, the liquid level gauge, the pressure sensor and the wireless transmission module are all electrically connected to the control panel 202. An air pump 206 is fixedly installed on the inner wall of the rear side of the installation box 201, and a transparent sealing plate 203 is fixedly installed on the front end surface of the installation box 201. The front end surface of the transparent sealing plate 203 is rotatably connected with a movable door 204, so that when the air pump 206 injects gas to pressurize between the sealing disk 301 and the isolation disk 402, the pressure in the artificial cracks and natural cracks in the rock sample can be simulated;

[0044] Two guide frames 209 are fixedly installed on the inner side of the upper end of the installation box 201, and a second hydraulic cylinder 208 is fixedly installed on the lower end surface of one of the guide frames 209, and a cylinder mounting seat 205 is slidably connected between the two guide frames 209. The output end of the second hydraulic cylinder 208 passes through one of the guide frames 209 and is fixedly connected to the cylinder mounting seat 205. Both ends of the cylinder mounting seat 205 are slidably connected to the two guide frames 209. A first hydraulic cylinder 207 is fixedly installed on the inner side of the middle part of the cylinder mounting seat 205, and the output end of the first hydraulic cylinder 207 is fixedly connected to the lower pressure seat 303 through a transmission plate 302. The height of the sealing transmission mechanism 3 can be adjusted through the action of the first hydraulic cylinder 207 and the second hydraulic cylinder 208, so as to facilitate the taking and placing of rock samples.

[0045] In summary, when measuring the permeability of a rock sample with artificial fractures and natural fractures, the rock sample is placed inside the storage test cylinder 401 and covered by the isolation disk 402, and the middle part of the isolation disk 402 is plugged into the inner side of the upper end of the rock sample to form a central collecting hole 405. The limiting ring 403 is connected to the storage test cylinder 401 through a threaded connection to limit the isolation disk 402, so as to prevent the rock sample from being separated from the storage test cylinder 401 during transportation and transfer. The power is turned on, and the distilled water in the distilled water storage chamber 111 is transported to the inner side of the installation cylinder 106 through the booster pump 108 to completely submerge the supporting hollow disk 113.

[0046] The storage test cylinder 401 is placed on the inner side of the mounting cylinder 106 so that the lower end surface of the storage test cylinder 401 is in contact with the surface of the distilled water inside the bottom end of the mounting cylinder 106 to avoid the presence of air between the lower end surface of the storage test cylinder 401 and the inner side of the bottom end of the mounting cylinder 106 when the distilled water is pressurized later, which may cause inaccurate measurement. At the same time, one end of the locking sleeve 114 is slid on the outer side of the reflux pipe 110 and penetrates the mounting cylinder 106 and is connected to the output end of the flow pump 404 through a thread, and then the output end of the flow pump 404 is connected to the reflux pipe 110 through the locking sleeve 114.

[0047] Start the second hydraulic cylinder 208, so that the second hydraulic cylinder 208 drives the first hydraulic cylinder 207 to move downward through the cylinder mounting seat 205 under the support of the guide frame 209, and then the first hydraulic cylinder 207 synchronously drives the lower pressing seat 303 and the sealing plate 301 to move downward to the inner side of the upper end of the mounting cylinder 106 through the transmission plate 302. At this time, the sealing plate 301 is sealed and connected with the mounting cylinder 106 through two sealing rings 305, and the lower pressing seat 303 is in contact with the upper end surface of the isolation plate 402 and is sleeved on the outer side of the output end of the flow pump 404;

[0048] Start the air pump 206, so that the air pump 206 can inject air and pressurize the space between the sealing disk 301 and the isolation disk 402 under the support of the installation box 201, so as to simulate the pressure in the artificial cracks and natural cracks in the rock sample. At the same time, start the first hydraulic cylinder 207, so that the first hydraulic cylinder 207 can press down the isolation disk 402 through the transmission plate 302 and the downward pressure seat 303 under the support of the cylinder mounting seat 205, thereby simulating the pressure environment of the rock sample in the rock formation and ensuring the accuracy of the permeability measurement of the rock sample.

[0049] Start the booster pump 108 again, so that the booster pump 108 replenishes and pressurizes the distilled water between the storage test cylinder 401 and the installation cylinder 106. The distilled water can be pressurized into the rock sample through the diversion at the bottom of the storage test cylinder 401, so as to realize the measurement operation of the permeability of the rock sample under different pressure environments. The central collecting hole 405 can collect the impurity water after the distilled water infiltrates the rock sample, so that the input end of the flow pump 404 extracts the impurity water inside the central collecting hole 405 and transports it to the inner side of the impurity water storage chamber 112 through the return pipe 110. The permeability of the rock sample under the coupling of artificial fractures and natural fractures can be obtained by monitoring the amount extracted from the central collecting hole 405 by the flow pump 404 through the control panel 202. The measurement is accurate and is not interfered by the water flowing out from between the storage test cylinder 401 and the isolation plate 402.

[0050] The impurity water in the impurity water storage chamber 112 can be filtered through the filter box 102 and transported to the distilled water storage chamber 111, so as to realize the recycling of the distilled water. By driving the sealing transmission mechanism 3 to reset by the first hydraulic cylinder 207 and separating the output end of the flow pump 404 from the locking sleeve 114, the sample storage mechanism 4 can be taken out from the installation tube 106, thereby facilitating the removal of the rock sample.

[0051] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A permeability measurement device based on the coupling of artificial fractures and natural fractures, comprising a circulating fluid replenishment mechanism (1), a sealing transmission mechanism (3) and a sample storage mechanism (4), characterized in that: A sample storage mechanism (4) is installed on the inner side of the upper end of the circulating liquid replenishment mechanism (1), a sealing transmission mechanism (3) is installed on the upper end of the sample storage mechanism (4), and a protective pressurization mechanism (2) is installed on the upper end of the sealing transmission mechanism (3). The circulating liquid replenishment mechanism (1) comprises a supporting bottom box (101), a plurality of supporting frames (103) are fixedly installed in the middle of the upper end surface of the supporting bottom box (101), a mounting tube (106) is installed on the inner side of the upper ends of the plurality of supporting frames (103), a supporting hollow disk (113) is fixedly installed on the inner side of the bottom end of the mounting tube (106), and a monitoring shell (115) is fixedly installed on the inner side of the supporting hollow disk (113); the sealing transmission mechanism (3) comprises a sealing disk (301), and the sealing disk (301) is slidably connected to the mounting tube (106). The sealing disk (301) is dynamically connected, a lower pressure seat (303) is fixedly installed on the inner side of the sealing disk (301), a transmission plate (302) is fixedly installed on the upper end of the lower pressure seat (303), two pressure rings (304) are installed on the outer side of the sealing disk (301), and a sealing ring (305) is provided on the outer side of the pressure ring (304); the sample storage mechanism (4) comprises a storage test cylinder (401), the storage test cylinder (401) is slidably connected to the installation cylinder (106), a limit ring (403) is installed on the upper end of the storage test cylinder (401), an isolation disk (402) is slidably connected on the inner side of the storage test cylinder (401), a central collecting hole (405) is provided on the inner side of the middle part of the isolation disk (402), and a flow pump (404) is fixedly installed in the middle part of the upper end surface of the isolation disk (402).

2. The permeability measurement device based on the coupling of artificial fractures and natural fractures according to claim 1 is characterized in that: The circulating liquid replenishing mechanism (1) further comprises a positioning ring (104) fixedly connected to the mounting tube (106); a plurality of locking knobs (105) are arranged on the outer side of the positioning ring (104); a filter box (102) is fixedly mounted on the front end surface of the supporting bottom box (101); a liquid storage tank (107) is fixedly mounted on the inner side of the supporting bottom box (101); an impurity water storage chamber (112) is arranged between the supporting bottom box (101) and the liquid storage tank (107); a return pipe (110) is mounted on the inner side of the impurity water storage chamber (112); a locking sleeve (114) is movably mounted on the outer side of the upper end of the return pipe (110); a distilled water storage chamber (111) is arranged inside the liquid storage tank (107); a booster pump (108) is mounted on the inner side of the distilled water storage chamber (111); a flow meter (109) is fixedly mounted on the output end of the booster pump (108).

3. The permeability measurement device based on the coupling of artificial fractures and natural fractures according to claim 1 is characterized in that: The protective boost mechanism (2) comprises an installation box (201), wherein the installation box (201) is fixedly connected to the supporting bottom box (101), a control panel (202) is fixedly installed on one side of the installation box (201), an air pump (206) is fixedly installed on the inner wall of the rear side of the installation box (201), a transparent sealing plate (203) is fixedly installed on the front end surface of the installation box (201), and a movable door (204) is rotatably connected to the front end surface of the transparent sealing plate (203), two guide frames (209) are fixedly installed on the inner side of the upper end of the installation box (201), a second hydraulic cylinder (208) is fixedly installed on the lower end surface of one of the guide frames (209), a cylinder mounting seat (205) is slidably connected between the two guide frames (209), and a first hydraulic cylinder (207) is fixedly installed on the inner side of the middle part of the cylinder mounting seat (205).

4. The permeability measurement device based on coupling of artificial fractures and natural fractures according to claim 2, characterized in that: The upper ends of the plurality of support frames (103) are all inserted between the mounting tube (106) and the positioning ring (104); one end of the locking knob (105) passes through the positioning ring (104) and is connected to the upper end of the support frame (103) by means of a thread; the plurality of support frames (103) are fixedly connected to the positioning ring (104) and the mounting tube (106) by means of the mounting tube (106); the bottom end of the storage test tube (401) is inserted into the inner side of the mounting tube (106) and is in close contact with the upper end surface of the supporting hollow disk (113); and the lower end surface of the storage test tube (401) is provided with a plurality of micro holes.

5. The permeability measurement device based on the coupling of artificial fractures and natural fractures according to claim 2, characterized in that: The interior of the distilled water storage chamber (111) is filled with distilled water, the booster pump (108) is fixedly connected to the liquid storage tank (107), the input end of the booster pump (108) is connected in a through-connection with the distilled water storage chamber (111), and the output end of the booster pump (108) passes through the liquid storage tank (107), the supporting bottom box (101) and the mounting cylinder (106) and is connected in a through-connection with the flow meter (109).

6. The permeability measurement device based on coupling of artificial fractures and natural fractures according to claim 1, characterized in that: A rock sample is arranged between the storage test cylinder (401) and the isolation disk (402); the upper end of the storage test cylinder (401) is connected to the limit ring (403) via a thread; the bottom end of the lower pressure seat (303) is in close contact with the upper end surface of the isolation disk (402); and the sealing disk (301) is connected to the installation cylinder (106) via two sealing rings (305).

7. The permeability measurement device based on coupling of artificial fractures and natural fractures according to claim 6, characterized in that: The inner wall of the central collecting hole (405) is provided with a plurality of waist-shaped flow guide holes, the input end of the flow pump (404) is plugged into the inner side of the central collecting hole (405), one end of the locking sleeve (114) passes through the mounting tube (106) and is connected to the output end of the flow pump (404) by means of a thread, a sealing ring is provided between the locking sleeve (114), the return pipe (110) and the mounting tube (106), the output end of the flow pump (404) passes through the lower pressure seat (303) and is fixedly connected to the upper end of the return pipe (110) by means of the locking sleeve (114), and the output end of the flow pump (404) is connected to the impurity water storage chamber (112) by means of the return pipe (110).

8. The permeability measurement device based on coupling of artificial fractures and natural fractures according to claim 7, characterized in that: The output end of the air pump (206) is plugged between the sealing disk (301) and the isolation disk (402) and is fixedly connected to the sealing disk (301), and the booster pump (108), the air pump (206), the first hydraulic cylinder (207), the second hydraulic cylinder (208) and the flow pump (404) are all electrically connected to the control panel (202).

9. The permeability measurement device based on coupling of artificial fractures and natural fractures according to claim 8, characterized in that: The output end of the second hydraulic cylinder (208) passes through one of the guide frames (209) and is fixedly connected to the cylinder mounting seat (205); both ends of the cylinder mounting seat (205) are slidably connected to the two guide frames (209); and the output end of the first hydraulic cylinder (207) is fixedly connected to the lower pressing seat (303) via a transmission plate (302).

10. The permeability measurement device based on coupling of artificial fractures and natural fractures according to claim 2, characterized in that: A liquid level meter and a pressure sensor are respectively provided on the inner sides of the upper and lower ends of the monitoring shell (115); a wireless transmission module is provided between the liquid level meter and the pressure sensor; and the flow meter (109), the liquid level meter, the pressure sensor and the wireless transmission module are all electrically connected to the control panel (202).

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