High-pressure gas blasting and acidification combined integrated test device and use method

Abstract

The invention relates to a high-pressure gas blasting and acidizing combined integrated test device which comprises a gas supercharger, an acid storage tank, a mixing tank, booster pumps, a test bed, a multi-way valve and a tailing collecting mechanism, the gas supercharger is communicated with the mixing tank and the test bed through the multi-way valve, the acid storage tank is communicated with one booster pump, and the other booster pump is communicated with the tailing collecting mechanism. The booster pump connected with the acid storage tank is respectively communicated with the mixing tank and the test bed through the multi-way valve, the mixing tank is communicated with the test bed through the multi-way valve, and the test bed is further communicated with the tailing collecting mechanism. The use method comprises the three steps of system construction, test operation and data summarization. The requirements of various geological environments and construction simulation operation can be effectively met, and meanwhile, the requirements of independent development and synchronous development of high-pressure gas blasting and acidification tests can be flexibly met, so that the efficiency of test work is greatly improved, and the test work flow is simplified.

Description

Technical Field

[0001] The invention belongs to the technical field of blasting test equipment, and in particular relates to a high-pressure gas blasting and acidizing combined integrated test device and a use method thereof. Background Art

[0002] As mining depth continues to increase, the difficulty of extracting unconventional gases such as coalbed methane and shale gas increases accordingly. Affected by geological conditions and the increase in mining depth, high-pressure gas blasting fracturing technology can increase the development and expansion of reservoir fractures, but under high stress, the fractures are easily closed, and acid acidification treatment can dissolve minerals such as quartz, carbonates and pyrite in the pores of the coal body. Therefore, for deep reservoirs with high mineral content, combining the advantages of high-pressure gas blasting and acid fracturing technology can further form seepage channels for gas migration. At present, domestic and foreign scholars mainly focus on the research and development of high-pressure gas blasting test devices and acidification test devices. During the test process, on the one hand, only a single test operation can be simulated, and complex environments cannot be simulated, and the test efficiency is low and the equipment maintenance cost is high. On the other hand, it is impossible to accurately detect the data and test results during the test.

[0003] Based on the above problems, after researching and improving the existing problems, a multi-field coupled high-pressure gas blasting and acidizing combined integrated test device is provided, aiming to solve some existing equipment problems through this equipment. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a high-pressure gas blasting and acidizing combined integrated test device and a use method thereof.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A high-pressure gas blasting and acidification combined integrated test device comprises a gas booster, an acid storage tank, a mixing tank, a booster pump, a test bench, a multi-way valve, a tail material collection mechanism and a drive circuit. The gas booster is connected to the mixing tank and the test bench respectively through the multi-way valve, the acid storage tank is connected to a booster pump, and the booster pump connected to the acid storage tank is connected to the mixing tank and the test bench respectively through the multi-way valve. There is a total of one mixing tank, which is connected to a booster pump through a guide pipe, and the booster pump connected to the mixing tank is connected to the test bench through the multi-way valve. The test bench is also connected to the tail material collection mechanism through the guide pipe. The drive circuit is connected to the outer side of the test bench and is electrically connected to the gas booster, the mixing tank, the booster pump, the test bench, the multi-way valve and the tail material collection mechanism respectively.

[0007] Furthermore, the mixing tank includes a supporting tank body, an atomizing spray pump, an atomizing spray port, a jet vent, a liquid inlet, an air inlet, an exhaust port, a liquid discharge port, an electric heating mechanism, a temperature sensor, a flow sensor and a control valve. The supporting tank body is a closed cavity structure with an axis vertically distributed to a horizontal plane. A liquid inlet and an air inlet are arranged on its upper end face, a liquid discharge port coaxially arranged on the bottom, and an exhaust port is arranged on the side wall. The distance between the exhaust port and the bottom of the supporting tank body is 20%-80% of the height of the supporting tank body. There are at least two atomizing spray ports, which are located in the supporting tank body and connected to the top of the supporting tank body, and each atomizing spray port is evenly distributed around the axis of the supporting tank body and connected to the liquid inlet. The liquid inlet is also connected to the atomizing spray pump through a guide pipe. The atomizing spray pump and The outer side of the supporting tank body is connected and connected to the acid storage tank through a booster pump. There are at least three jet air outlets, which are located inside the supporting tank body and connected to the side wall of the supporting tank body. Each jet air outlet is connected to the air inlet and is distributed in a spiral structure around the axis of the supporting tank body. At the same time, the air inlet is connected to the gas booster. The drain port and the exhaust port are both connected to the booster pump through a guide pipe, and the booster pumps connected to the exhaust port and the drain port are connected in parallel. There are at least two electric heating mechanisms and temperature sensors, which are embedded in the side wall of the supporting tank body and evenly distributed around the axis of the supporting tank body. A flow sensor and a control valve are each provided at the liquid inlet, air inlet, drain port and exhaust port. The atomizing spray pump, the electric heating mechanism, the temperature sensor, the flow sensor and the control valve are all electrically connected to the drive circuit.

[0008] Furthermore, the test bench includes a bearing frame, a gas explosion test tank, a main hydraulic bag, an auxiliary hydraulic bag, an adjusting pressure plate, an elastic guide tube, a gas fracturing pipe, a connecting pipe head, an aeration plate, a control valve, a three-way valve and a hydraulic station. The bearing frame is a columnar frame structure with an axis vertically distributed to the horizontal plane. At least one gas explosion test tank is embedded in the bearing frame, and the axis of the gas explosion test tank is parallel to the axis of the bearing frame. The gas explosion test tank is a cylindrical hollow cavity structure, and its upper and lower end faces are each provided with a connecting pipe head coaxially distributed therewith, and a control valve is provided at the connecting pipe head, wherein the connecting pipe head at its lower end face is connected to a tail material collection mechanism The connecting pipe head on the upper end face is connected with the multi-way valve through the guide pipe, and is respectively connected with the gas booster, the acid storage tank and the mixing tank through the multi-way valve. A main hydraulic bag and two auxiliary hydraulic bags are arranged in the gas explosion test tank, wherein the main hydraulic bag is a hollow cylindrical tubular structure coaxially distributed with the gas explosion test tank, located in the middle of the gas explosion test tank and connected to the inner surface of the gas explosion test tank, and its length is not less than 70% of the length of the gas explosion test tank, and the auxiliary hydraulic bag is a closed ring structure coaxially distributed with the gas explosion test tank, and is located outside the two ends of the main hydraulic bag, and at the same time, the upper end faces of the two auxiliary hydraulic bags are respectively connected to the gas explosion test tank The upper end face and the lower end face of the test tank are connected, and they are against and slidably connected with the inner side face of the gas bursting test tank. At the same time, the lower end face of the auxiliary hydraulic bladder is connected with the upper surface of the adjusting pressure plate. There are two adjusting pressure plates, which are located between the main hydraulic bladder and the auxiliary hydraulic bladder. They are coaxially distributed with the gas bursting test tank and are against and slidably connected with the inner side face of the gas bursting test tank. At the same time, the lower end face of the adjusting pressure plate is against the end face of the main hydraulic bladder. A connecting pipe head coaxially distributed with the adjusting pressure plate is also provided on the adjusting pressure plate, and the connecting pipe head provided on the adjusting pressure plate is connected with the connecting pipe heads provided at both ends of the gas bursting test tank through an elastic guide pipe. The gas fracturing pipe is located at the main hydraulic bladder. The gas bursting test tank is located at the corresponding position in the gas bursting test tank and is coaxially distributed with the gas bursting test tank. At the same time, the gas fracturing pipe is connected to the connecting pipe head of the adjusting pressure plate at the upper end surface of the gas bursting test tank through a three-way valve. At the same time, the connecting pipe head of the adjusting pressure plate at the upper end surface of the gas bursting test tank is also connected to the aeration plate through a three-way valve. The aeration plate is embedded in the lower end surface of the adjusting pressure plate, is coaxially distributed with the adjusting pressure plate, and is connected to the cavity of the gas bursting test tank corresponding to the main hydraulic bag. The hydraulic station is connected to the carrying frame and is respectively connected to the main hydraulic bag and the auxiliary hydraulic bag through high-pressure pipelines. In addition, the control valve, the three-way valve, the hydraulic station and the adjusting pressure plate are also electrically connected to the drive circuit.

[0009] Furthermore, the gas explosion test tank includes a tank body, a sealed end cover, an electric heating device, a spring, a pressure sensor, and a temperature sensor, wherein the tank body is a cylindrical hollow tubular structure, and its two ends are connected to the sealed end covers to form a closed cavity structure, and the inner sides of the tank body and the sealed end cover are each provided with at least two springs evenly distributed around the axis of the tank body, wherein the tank body is connected to the outer side of the main hydraulic bladder through the spring, and the sealed end cover is connected to the upper end surface of the auxiliary hydraulic bladder through the spring, and the spring is connected to the tank body and the sealed end cover through the pressure sensor, the electric heating device and the temperature sensor are both embedded in the tank body, evenly distributed around the axis of the tank body, and distributed along the axis direction of the tank body, and the electric heating device, the pressure sensor, and the temperature sensor are all electrically connected to the drive circuit.

[0010] Furthermore, the regulating pressure plate includes a tray, a pressure sensor, an air pressure sensor, a spring, and an elastic protective net, wherein the tray is a circular groove structure with an "H"-shaped axial cross-section, the upper end face and the lower end face of the tray are connected to an elastic protective net through springs, and the elastic protective net is wrapped around the outside of the tray end face and coaxially distributed with the tray, and the spring is connected to the tray through at least three pressure sensors evenly distributed around the axis of the tray, and at the same time, the aeration plate and the three-way valve are embedded in the groove body on the lower end face of the tray and connected to the bottom of the groove, and an air pressure sensor is provided at the connection between the three-way valve, the aeration plate and the elastic guide pipe, and the pressure sensor and the air pressure sensor are electrically connected to the drive circuit.

[0011] Furthermore, the tail material collection mechanism includes a collecting tank, a liquid level sensor, a pH sensor, a drainage fan, and an air pressure sensor. There is at least one collecting tank, which is connected to the drainage fan through a guide pipe. At the same time, the drainage fan is also connected to the connecting pipe head on the lower end surface of the gas explosion test tank of the test bench through the guide pipe. The liquid level sensor, pH sensor, and air pressure sensor are all located in the collecting tank, wherein the air pressure sensor is connected to the top of the collecting tank, and the liquid level sensor and pH sensor are both connected to the inner surface of the side wall of the collecting tank. There are several pH sensors, which are evenly distributed in the vertical direction. At the same time, the liquid level sensor, pH sensor, drainage fan, and air pressure sensor are all electrically connected to the drive circuit.

[0012] Furthermore, the driving circuit is a circuit system based on a programmable controller, and the driving circuit is also provided with a serial communication circuit.

[0013] A method for using a high-pressure gas blasting and acidizing combined integrated test device comprises the following steps:

[0014] S1, system construction, first assemble the gas booster, acid storage tank, mixing tank, booster pump, test bench, multi-way valve, tail material collection mechanism and drive circuit to obtain a finished test device, and set a corresponding number of test benches according to the type and number of tests in the test process, and connect the test benches in parallel; then, on the one hand, set the working parameters of the gas booster and the test gas pressure; on the other hand, preset the test acid in the acid storage tank for standby; finally, connect the drive circuit with the external power supply system and remote data acquisition system to complete the construction of the test device;

[0015] S2, test operation. After completing step S1, the test operation can be carried out. During the test operation, the test sample is first installed in the test bench, and the gas fracturing pipe set in the test bench is embedded in the sample and coaxially distributed between the samples; then the test bench is driven to operate, the main hydraulic bladder and auxiliary hydraulic bladder of the test bench are pressurized, and the main hydraulic bladder and auxiliary hydraulic bladder are made to apply axial pressure and circumferential pressure to the sample, and specific test operations can be carried out after the test pressure reaches the set value. The test operation is divided into two types: independent test detection and mixed test detection, specifically:

[0016] Acid acidification test: First, the acid in the acid storage tank is pressurized by a booster pump, and the acid is adjusted to a constant pressure by a control valve, and then the acid is transported to the test sample through the gas fracturing pipe. Finally, the waste liquid generated by the seepage of the test sample is collected and processed by the tailings collection mechanism. At the same time, during the acid acidification test, the amount of acid in the test piece, the acid concentration and the acid seepage velocity are tested on the one hand; on the other hand, the damage and pore and crack development of the test piece under different conditions are monitored in real time.

[0017] Sour gas explosion test: First, the gas for external test is pressurized by the gas booster, and the pressurized gas is pressure-regulated by the booster pump and then transported to the mixing tank. At the same time, the acid liquid in the acid storage tank is pressurized by the booster pump and then atomized and sprayed through the mixing tank and then transported to the mixing tank. In the mixing tank, the atomized acid liquid is mixed with the high-pressure gas in proportion and then pressure-regulated again by the booster pump. The pressure-regulated mixed gas is transported to the gas fracturing pipe set up on the test bench and the sample is subjected to fracturing and blasting operations. At the same time, during the sour gas explosion test, on the one hand, parameters such as acid gas concentration and gas flow rate can be tested, and on the other hand, the pressure value and damage form of the fracturing and blasting operation can be detected;

[0018] Combined test of gas explosion and acidification: First, the gas booster is used to pressurize the external test gas, and the pressurized gas is transported to the test bench after pressure adjustment by the booster pump, driving the gas fracturing pipe set on the test bench to operate and perform fracturing and blasting operations on the sample; and the test bench detects the pressure value and damage form of the fracturing and blasting operation; then after the explosion and when the stress state is stable, the booster pump is driven to operate to pressurize the acid in the acid storage tank, and the pressurized acid is injected into the gas explosion test tank from the top of the gas explosion test tank of the test bench, and continuously sprayed directly onto the upper end surface of the sample, so that the acid flows from top to bottom along the axis of the sample through the sample, and is discharged from the lower end surface of the gas explosion test tank. During the flow of the acid, on the one hand, the amount of acid in the specimen, the acid concentration and the acid seepage velocity are detected; on the other hand, the damage and pore and crack development of the specimen under different conditions are monitored in real time; finally, the tail material collection mechanism collects and treats the tail gas and waste liquid generated by the explosion and acid seepage;

[0019] S3, data summary, after completing the current test, on the one hand, the data generated by the test is collected and summarized to obtain specific test result data; on the other hand, the test bench is depressurized, the sample is taken out of the test bench, the gas fracturing pipe is replaced, and the equipment is cleaned, and subsequent test operations can be carried out.

[0020] Furthermore, in the step S2, the temperature of the test operation is 0-80°C, and the pressure of the main hydraulic bladder and the auxiliary hydraulic bladder set on the test bench during the experiment is not greater than 25Mpa.

[0021] The structure of the present invention has good versatility and strong environmental adaptability. It can effectively meet the needs of various geological environments and structural simulation operations. At the same time, it can also flexibly realize the needs of independent and synchronous high-pressure gas blasting and acidizing tests, thereby greatly improving the efficiency of the test work, simplifying the test workflow, and reducing the difficulty and cost of the test work. In addition, it also effectively improves the convenience of obtaining test data in detection operations and the accuracy of test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments;

[0023] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the partial structure of the mixing tank in cross section;

[0025] Figure 3 It is a schematic diagram of the local structure of the test bench;

[0026] Figure 4 This is a schematic diagram of the partial structure of the gas explosion test tank in cross section;

[0027] Figure 5 It is a schematic diagram of the local structure of the adjusting plate;

[0028] Figure 6 It is a schematic diagram of the partial structure of the tailings collection mechanism in cross section;

[0029] Figure 7 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0030] In order to facilitate the construction of the technical means, creative features, objectives and effects achieved by the present invention, the present invention is further described below in conjunction with specific implementation methods.

[0031] like Figure 1-6 As shown, a high-pressure gas blasting and acidification combined integrated test device includes a gas booster 1, an acid storage tank 2, a mixing tank 3, a booster pump 4, a test bench 5, a multi-way valve 6, a tail material collection mechanism 7 and a drive circuit 8. The gas booster 1 is connected to the mixing tank 3 and the test bench 5 through the multi-way valve 6, respectively. The acid storage tank 2 is connected to a booster pump 4, and the booster pump 4 connected to the acid storage tank 2 is connected to the mixing tank 3 and the test bench 5 through the multi-way valve 6. There is a total of one mixing tank 3, which is connected to a booster pump 4 through a guide pipe, and the booster pump 4 connected to the mixing tank 3 is connected to the test bench 5 through the multi-way valve 6. The test bench 5 is also connected to the tail material collection mechanism 7 through a guide pipe. The drive circuit 8 is connected to the outer side of the test bench 5, and is electrically connected to the gas booster 1, the mixing tank 3, the booster pump 4, the test bench 5, the multi-way valve 6, and the tail material collection mechanism 7.

[0032] In this embodiment, the mixing tank 3 includes a supporting tank body 31, an atomizing spray pump 32, an atomizing spray port 33, a jet air port 34, a liquid inlet 35, an air inlet 36, an exhaust port 37, a liquid discharge port 38, an electric heating mechanism 39, a temperature sensor 30, a flow sensor 301 and a control valve 302. The supporting tank body 31 is a closed cavity structure with an axis perpendicular to the horizontal plane, and a liquid inlet 35 and an air inlet 37 are provided on the upper end surface, and a coaxially distributed The side wall of the tank body 31 is provided with a discharge port 38, and an exhaust port 37 is provided, and the distance between the exhaust port 37 and the bottom of the bearing tank body 31 is 20%-80% of the height of the bearing tank body 31, and at least two atomizing spray ports 33 are located in the bearing tank body 31 and connected to the top of the bearing tank body 31, and each atomizing spray port 33 is evenly distributed around the axis of the bearing tank body 31 and communicated with the liquid inlet 35, and the liquid inlet 35 is also communicated with the atomizing spray pump 32 through a guide pipe, and the atomizing spray pump 32 is connected to the bearing tank body 31. The outer side of the carrier tank body 31 is connected and connected to the acid storage tank 2 through the booster pump 4. There are at least three jet air ports 34, which are located in the carrier tank body 31 and connected to the side wall of the carrier tank body 31. Each jet air port 34 is connected to the air inlet 37 and is distributed in a spiral structure around the axis of the carrier tank body 31. At the same time, the air inlet 37 is connected to the gas booster 1. The drain port 38 and the exhaust port 37 are both connected to the booster pump 4 through the guide pipe, and the exhaust port 37 and the drain port 38 are connected. The booster pumps 4 are connected in parallel, and there are at least two electric heating mechanisms 39 and temperature sensors 30, which are embedded in the side wall of the support tank body 31 and evenly distributed around the axis of the support tank body 31. A flow sensor 301 and a control valve 302 are provided at the liquid inlet 35, the air inlet 37, the liquid discharge port 38 and the exhaust port 37. The atomizing spray pump 32, the electric heating mechanism 33, the temperature sensor 30, the flow sensor 301 and the control valve 302 are all electrically connected to the drive circuit 8.

[0033] The mixing tank provided can, on the one hand, realize the need of buffering, regulating pressure and adjusting temperature of the high-pressure gas and acid liquid used in the test, thereby improving the supply stability of the high-pressure gas and acid liquid in the test; on the other hand, it can also realize the mixing operation of the high-pressure gas and the acid liquid, thereby meeting the need of carrying out gas blasting and acidizing test operations separately, and can also realize the continuous implementation of the two test steps of gas blasting test followed by acidizing test, in addition, it can also realize the need of blasting operation by the acidic mixed gas after the high-pressure gas and acid liquid are mixed, thereby improving the flexibility and diversity of the test operation.

[0034] In practical applications, in order to improve the efficiency and uniformity of mixing between gas and acid mist, an ultrasonic atomization mechanism can be added to the carrier tank. Ultrasonic waves can be used to achieve full and uniform mixing between gas and droplets. On the other hand, ultrasonic oscillations can be used to further reduce the diameter of acid mist droplets, thereby improving the mixing uniformity and mixing efficiency between acid mist and high-pressure gas. At the same time, it also helps to improve the uniformity of the combination of acid mist in the test sample with the sample surface, thereby improving the test efficiency and test accuracy.

[0035] It is emphasized that the test bench 5 includes a bearing frame 51, a gas explosion test tank 52, a main hydraulic bag 53, an auxiliary hydraulic bag 54, an adjusting plate 55, an elastic guide tube 56, a gas fracturing tube 57, a connecting pipe head 58, an aeration plate 59, a control valve 302, a three-way valve 50 and a hydraulic station 501. The bearing frame 51 is a columnar frame structure with an axis perpendicular to the horizontal plane. At least one gas explosion test tank 52 is embedded in the bearing frame 51, and the axis of the gas explosion test tank 52 is parallel to the axis of the bearing frame 51. The gas explosion test tank 52 is a cylindrical hollow cavity structure, and its upper end face and lower end face are each provided with a connecting pipe head 58 coaxially distributed therewith, and the connecting pipe head 58 is provided with a control valve 3 02, wherein the connecting pipe head 58 at the lower end face is connected with the tail material collecting mechanism 7, the connecting pipe head 58 at the upper end face is connected with the multi-way valve 6 through the guide pipe, and is respectively connected with the gas booster 1, the acid storage tank 2, and the mixing tank 3 through the multi-way valve 6, wherein the gas explosion test tank 52 is provided with a main hydraulic bag 53 and two auxiliary hydraulic bags 54, wherein the main hydraulic bag 53 is a hollow cylindrical tubular structure coaxially distributed with the gas explosion test tank 52, located in the middle position of the gas explosion test tank 52 and connected to the inner surface of the gas explosion test tank 52, and its length is not less than 70% of the length of the gas explosion test tank 52, the auxiliary hydraulic bag 54 is a closed ring structure coaxially distributed with the gas explosion test tank 52, and is located in the main hydraulic bag The two ends of the bag 53 are outside, and the upper end faces of the two auxiliary hydraulic bladder bags 54 are respectively connected to the upper end face and the lower end face of the gas explosion test tank 52, and are against and slidably connected to the inner side of the gas explosion test tank 52. At the same time, the lower end face of the auxiliary hydraulic bladder bag 54 is connected to the upper surface of the adjusting pressure plate 55. There are two adjusting pressure plates 55, which are located between the main hydraulic bladder bag 53 and the auxiliary hydraulic bladder bag 54, and are coaxially distributed with the gas explosion test tank 52 and are against and slidably connected to the inner side of the gas explosion test tank 52. At the same time, the lower end face of the adjusting pressure plate 55 is against the end face of the main hydraulic bladder bag 53. The adjusting pressure plate 55 is also provided with a connecting pipe head 58 coaxially distributed therewith, and the connecting pipe head 58 provided on the adjusting pressure plate 55 is connected through the elastic guide pipe 56. The gas fracturing pipe 57 is connected with the connecting pipe heads 58 provided at both ends of the gas explosion test tank 52. The gas fracturing pipe 57 is located at the position in the gas explosion test tank 52 corresponding to the main hydraulic bag 53 and is coaxially distributed with the gas explosion test tank 52. At the same time, the gas fracturing pipe 57 is connected with the connecting pipe head 58 of the adjusting pressure plate 55 at the upper end surface of the gas explosion test tank 52 through the three-way valve 50. At the same time, the connecting pipe head 58 of the adjusting pressure plate 55 at the upper end surface of the gas explosion test tank 52 is also connected with the aeration plate 59 through the three-way valve 50. The aeration plate 59 is embedded in the lower end surface of the adjusting pressure plate 55, is coaxially distributed with the adjusting pressure plate 55 and is connected with the cavity of the gas explosion test tank 52 corresponding to the main hydraulic bag 53. The hydraulic station 501 is connected with the supporting frame 51.The main hydraulic bag 53 and the auxiliary hydraulic bag 54 are connected through high-pressure pipelines. In addition, the control valve 302, the three-way valve 50, the hydraulic station 501 and the regulating plate 55 are also electrically connected to the drive circuit 8.

[0036] Among them, the main hydraulic bag and the auxiliary hydraulic bag can flexibly adjust their working pressure under the drive of the hydraulic station, so as to effectively clamp and position the sample. On the one hand, the main hydraulic bag can provide a stable radial pressure for the sample; on the other hand, the auxiliary hydraulic bag can provide a stable axial pressure for the sample, so as to achieve the confining pressure setting of the sample to meet the needs of different geological structure environments;

[0037] At the same time, during blasting operations, on the one hand, the main hydraulic bladder and the auxiliary hydraulic bladder can effectively transmit the blasting pressure, thereby meeting the needs of blasting force detection operations through pressure sensors;

[0038] When the blasting force is greater than the pressure of the main hydraulic bladder and the auxiliary hydraulic bladder, driven by the blasting force, the main hydraulic bladder and the auxiliary hydraulic bladder can transmit the blasting pressure while also undergoing elastic deformation, thereby reducing the damage to the test equipment caused by the blasting force and improving the safety of the test.

[0039] The aeration plate can effectively improve the working efficiency and the uniformity of acid distribution when the acid is transported to the end face of the sample.

[0040] In addition, the gas explosion test tank 52 includes a tank body 521, a sealed end cover 522, an electric heating device 523, a spring 524, a pressure sensor 525, and a temperature sensor 30, wherein the tank body 521 is a cylindrical hollow tubular structure, and its two ends are connected to the sealed end cover 522 to form a closed cavity structure, and the inner side surfaces of the tank body 521 and the sealed end cover 522 are each provided with at least two springs 524 uniformly distributed around the axis of the tank body 521, wherein the tank body 521 is connected to the main hydraulic bag through the spring 524. The outer side of the bag 53 is connected, the sealing end cover 522 is connected to the upper end surface of the auxiliary hydraulic bladder bag 54 through the spring piece 524, the spring piece 524 is connected to the tank body 521 and the sealing end cover 522 through the pressure sensor 525, the electric heating device 523 and the temperature sensor 30 are embedded in the tank body 521, evenly distributed around the axis of the tank body 521, and distributed along the axis direction of the tank body 521, the electric heating device 523, the pressure sensor 525, and the temperature sensor 30 are all electrically connected to the drive circuit 8.

[0041] The set shrapnel assists the main hydraulic bag in carrying the sample and detecting the blasting force at the same time. It also assists the main hydraulic bag in elastically absorbing the blasting force through its elastic deformation ability to prevent the equipment from being damaged by the blasting force.

[0042] The electric heating device provided at the same time can effectively adjust the test temperature during the test, and detect the test temperature through the temperature sensor.

[0043] At the same time, the regulating pressure plate 55 includes a tray 551, a pressure sensor 525, an air pressure sensor 552, a spring 524, and an elastic protective net 553, wherein the tray 551 is a circular groove structure with an axial cross-section in the shape of an "H", and the upper and lower end surfaces of the tray 550 are connected to an elastic protective net 553 through springs, and the elastic protective net 553 is covered outside the end surface of the tray 551 and is coaxially distributed with the tray 551, and the spring 524 is connected to the tray 551 through at least three pressure sensors 525 uniformly distributed around the axis of the tray 551, and at the same time, the aeration plate 59 and the three-way valve 50 are embedded in the groove body on the lower end surface of the tray 551 and connected to the bottom of the groove, and the air pressure sensor 552 is respectively provided at the connection between the three-way valve 50, the aeration plate 59 and the elastic guide tube 56, and the pressure sensor 525 and the air pressure sensor 552 are both electrically connected to the drive circuit 8.

[0044] The tray provided can effectively improve the load-bearing capacity of the adjusting platen for the specimen, while achieving the installation and positioning stability of the auxiliary hydraulic bladder. At the same time, through the shrapnel and the elastic protective net, it can assist the auxiliary hydraulic bladder in detecting the pressure sensor while assisting the main hydraulic bladder in elastically absorbing the blasting force through its elastic deformation ability, thereby further improving the stability of the equipment operation.

[0045] In addition, during operation, at least one coaxially distributed elastic sealing ring is disposed on the outer side of the tray, and the elastic sealing ring abuts against and is slidably connected to the inner side of the tank body of the gas explosion test tank.

[0046] In this embodiment, the tail material collection mechanism 7 includes a collection tank 71, a liquid level sensor 72, a pH sensor 73, a drainage fan 74, and an air pressure sensor 552. There is at least one collection tank 71, which is connected to the drainage fan 74 through a guide pipe. At the same time, the drainage fan 74 is also connected to the connecting pipe head 58 on the lower end surface of the gas explosion test tank 52 of the test bench 5 through a guide pipe. The liquid level sensor 72, the pH sensor 73, and the air pressure sensor 552 are all located in the collection tank 71, wherein the air pressure sensor 552 is connected to the top of the collection tank 71, and the liquid level sensor 72 and the pH sensor 73 are both connected to the inner surface of the side wall of the collection tank 71. There are a plurality of pH sensors 73, which are evenly distributed in the vertical direction. At the same time, the liquid level sensor 72, the pH sensor 73, the drainage fan 74, and the air pressure sensor 552 are all electrically connected to the drive circuit 8.

[0047] The set collection tank is used to collect the exhaust gas and waste liquid after the test. At the same time, the set liquid level sensor is used to detect the amount of acid discharged after the test, and the pH sensor is used to detect the pH value of the discharged acid, so as to achieve the purpose of statistical calculation of the acid loss during the test.

[0048] In this embodiment, the driving circuit 8 is a circuit system based on a programmable controller, and the driving circuit 8 is also provided with a serial communication circuit.

[0049] A method for using a high-pressure gas blasting and acidizing combined integrated test device comprises the following steps:

[0050] S1, system construction, first assemble the gas booster, acid storage tank, mixing tank, booster pump, test bench, multi-way valve, tail material collection mechanism and drive circuit to obtain a finished test device, and set a corresponding number of test benches according to the type and number of tests in the test process, and connect the test benches in parallel; then, on the one hand, set the working parameters of the gas booster and the test gas pressure; on the other hand, preset the test acid in the acid storage tank for standby; finally, connect the drive circuit with the external power supply system and remote data acquisition system to complete the construction of the test device;

[0051] S2, test operation. After completing step S1, the test operation can be carried out. During the test operation, the test sample is first installed in the test bench, and the gas fracturing pipe set in the test bench is embedded in the sample and coaxially distributed between the samples; then the test bench is driven to operate, the main hydraulic bladder and auxiliary hydraulic bladder of the test bench are pressurized, and the main hydraulic bladder and auxiliary hydraulic bladder are made to apply axial pressure and circumferential pressure to the sample, and specific test operations can be carried out after the test pressure reaches the set value. The test operation is divided into two types: independent test detection and mixed test detection, specifically:

[0052] Acid acidification test: First, the acid in the acid storage tank is pressurized by a booster pump, and the acid is adjusted to a constant pressure by a control valve, and then the acid is transported to the test sample through the gas fracturing pipe. Finally, the waste liquid generated by the seepage of the test sample is collected and processed by the tailings collection mechanism. At the same time, during the acid acidification test, the amount of acid in the test piece, the acid concentration and the acid seepage velocity are tested on the one hand; on the other hand, the damage and pore and crack development of the test piece under different conditions are monitored in real time.

[0053] Sour gas explosion test: First, the gas for external test is pressurized by the gas booster, and the pressurized gas is pressure-regulated by the booster pump and then transported to the mixing tank. At the same time, the acid liquid in the acid storage tank is pressurized by the booster pump and then atomized and sprayed through the mixing tank and then transported to the mixing tank. In the mixing tank, the atomized acid liquid is mixed with the high-pressure gas in proportion and then pressure-regulated again by the booster pump. The pressure-regulated mixed gas is transported to the gas fracturing pipe set up on the test bench and the sample is subjected to fracturing and blasting operations. At the same time, during the sour gas explosion test, on the one hand, parameters such as acid gas concentration and gas flow rate can be tested, and on the other hand, the pressure value and damage form of the fracturing and blasting operation can be detected;

[0054] Combined test of gas explosion and acidification: First, the gas booster is used to pressurize the external test gas, and the pressurized gas is transported to the test bench after pressure adjustment by the booster pump, driving the gas fracturing pipe set on the test bench to operate and perform fracturing and blasting operations on the sample; and the test bench detects the pressure value and failure form of the fracturing and blasting operation; then after the explosion and when the stress state is stable, the booster pump is driven to operate to pressurize the acid in the acid storage tank, and the pressurized acid is injected into the gas explosion test tank from the top of the gas explosion test tank of the test bench, and continuously sprayed directly onto the upper end surface of the sample, so that the acid flows from top to bottom along the axis of the sample through the sample, and is discharged from the lower end surface of the gas explosion test tank. During the flow of the acid, on the one hand, the amount of acid in the specimen, the acid concentration and the acid seepage velocity are detected; on the other hand, the damage and pore and crack development of the specimen under different conditions are monitored in real time; finally, the tail material collection mechanism collects and treats the tail gas and waste liquid generated by the explosion and acid seepage. By setting up mixed test detection, on the one hand, it is possible to effectively simulate different gas fracturing and explosion operating environments, such as using acidic gases such as carbon dioxide to combine with groundwater to produce an acidic environment after completing the fracturing and blasting operation; on the other hand, by simultaneously injecting high-pressure gas when the acid seeps through the sample, it is possible to simulate the flow state of other gases along the cracks in the bottom layer, such as groundwater and biogas, thereby further improving the accuracy and effect of the test;

[0055] S3, data summary, after completing the current test, on the one hand, the data generated by the test is collected and summarized to obtain specific test result data; on the other hand, the test bench is depressurized, the sample is taken out of the test bench, the gas fracturing pipe is replaced, and the equipment is cleaned, and subsequent test operations can be carried out.

[0056] In this embodiment, in the step S2, the temperature of the test operation is 0-80°C, and the pressure of the main hydraulic bladder and the auxiliary hydraulic bladder set on the test bench during the experiment is not greater than 25MPa.

[0057] In this embodiment, when the high-pressure gas and acid mist are mixed in the mixing tank, the pressure of the acid mist is not less than the pressure of the high-pressure gas, and the volume of the acid mist is not more than 30% of the volume of the high-pressure gas.

[0058] The structure of the present invention has good versatility and strong environmental adaptability. It can effectively meet the needs of various geological environments and structural simulation operations. At the same time, it can also flexibly realize the needs of independent and synchronous high-pressure gas blasting and acidizing tests, thereby greatly improving the efficiency of the test work, simplifying the test workflow, and reducing the difficulty and cost of the test work. In addition, it also effectively improves the convenience of obtaining test data in detection operations and the accuracy of test data.

[0059] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-pressure gas blasting and acidizing combined integrated test device, characterized in that: The high-pressure gas blasting and acidification combined integrated test device includes a gas booster, an acid storage tank, a mixing tank, a booster pump, a test bench, a multi-way valve, a tail material collection mechanism and a drive circuit. The gas booster is connected to the mixing tank and the test bench respectively through the multi-way valve, the acid storage tank is connected to a booster pump, and the booster pump connected to the acid storage tank is connected to the mixing tank and the test bench respectively through the multi-way valve. There is a total of one mixing tank, which is connected to a booster pump through a guide pipe, and the booster pump connected to the mixing tank is connected to the test bench through the multi-way valve. The test bench is also connected to the tail material collection mechanism through the guide pipe. The drive circuit is connected to the outer side of the test bench, and is electrically connected to the gas booster, the mixing tank, the booster pump, the test bench, the multi-way valve, and the tail material collection mechanism.

2. A high-pressure gas explosion and acidification combined integrated test device according to claim 1, characterized in that: The mixing tank includes a supporting tank body, an atomizing spray pump, an atomizing spray port, a jet vent, a liquid inlet, an air inlet, an exhaust port, a liquid discharge port, an electric heating mechanism, a temperature sensor, a flow sensor and a control valve. The supporting tank body is a closed cavity structure with an axis vertically distributed to a horizontal plane. A liquid inlet and an air inlet are arranged on its upper end surface, a liquid discharge port coaxially distributed therewith is arranged at the bottom, and an exhaust port is arranged on the side wall. The distance between the exhaust port and the bottom of the supporting tank body is 20%-80% of the height of the supporting tank body. There are at least two atomizing spray ports, which are located in the supporting tank body and connected to the top of the supporting tank body, and each atomizing spray port is evenly distributed around the axis of the supporting tank body and is connected to the liquid inlet. The liquid inlet is also connected to the atomizing spray pump through a guide pipe. The atomizing spray pump is connected to the supporting tank body. The outer side of the tank body is connected and connected to the acid storage tank through a booster pump. There are at least three jet air outlets, which are located inside the support tank body and connected to the side wall of the support tank body. Each jet air outlet is connected to the air inlet and is distributed in a spiral structure around the axis of the support tank body. At the same time, the air inlet is connected to the gas booster. The drain port and the exhaust port are both connected to the booster pump through a guide pipe, and the booster pumps connected to the exhaust port and the drain port are connected in parallel. There are at least two electric heating mechanisms and temperature sensors, which are embedded in the side wall of the support tank body and evenly distributed around the axis of the support tank body. A flow sensor and a control valve are provided at the liquid inlet, air inlet, drain port and exhaust port. The atomizing spray pump, the electric heating mechanism, the temperature sensor, the flow sensor and the control valve are all electrically connected to the drive circuit.

3. The high-pressure gas explosion and acidification combined integrated test device according to claim 1 is characterized in that: The test bench includes a load-bearing frame, a gas explosion test tank, a main hydraulic bag, an auxiliary hydraulic bag, an adjusting pressure plate, an elastic guide pipe, a gas fracturing pipe, a connecting pipe head, an aeration plate, a control valve, a three-way valve and a hydraulic station. The load-bearing frame is a columnar frame structure with an axis vertically distributed to the horizontal plane. At least one gas explosion test tank is embedded in the load-bearing frame, and the axis of the gas explosion test tank is parallel to the axis of the load-bearing frame. The gas explosion test tank is a cylindrical hollow cavity structure, and its upper and lower end faces are each provided with a connecting pipe head coaxially distributed therewith, and a control valve is provided at the connecting pipe head, wherein the connecting pipe head at its lower end face is connected to a tail material collection mechanism, and the upper The connecting pipe head on the end face is connected to the multi-way valve through the guide pipe, and is respectively connected to the gas booster, the acid storage tank, and the mixing tank through the multi-way valve. A main hydraulic bag and two auxiliary hydraulic bags are arranged in the gas explosion test tank, wherein the main hydraulic bag is a hollow cylindrical tubular structure coaxially distributed with the gas explosion test tank, located in the middle of the gas explosion test tank and connected to the inner surface of the gas explosion test tank, and its length is not less than 70% of the length of the gas explosion test tank, and the auxiliary hydraulic bag is a closed ring structure coaxially distributed with the gas explosion test tank, and is located outside the two ends of the main hydraulic bag, and at the same time, the upper end faces of the two auxiliary hydraulic bags are respectively connected to the gas explosion test tank. The upper end face is connected to the lower end face, and is abutted against and slidably connected to the inner side of the gas bursting test tank. At the same time, the lower end face of the auxiliary hydraulic bladder is connected to the upper surface of the adjusting pressure plate. There are two adjusting pressure plates, which are located between the main hydraulic bladder and the auxiliary hydraulic bladder. They are coaxially distributed with the gas bursting test tank and abutted against and slidably connected to the inner side of the gas bursting test tank. At the same time, the lower end face of the adjusting pressure plate abuts against the end face of the main hydraulic bladder. A connecting pipe head coaxially distributed with the main hydraulic bladder is also provided on the adjusting pressure plate, and the connecting pipe head provided on the adjusting pressure plate is connected to the connecting pipe heads provided at both ends of the gas bursting test tank through an elastic guide pipe. The gas fracturing pipe is located at the corresponding position of the main hydraulic bladder The gas bursting test tank is located at a position inside the gas bursting test tank and is coaxially distributed with the gas bursting test tank. At the same time, the gas fracturing pipe is connected to the connecting pipe head of the adjusting pressure plate at the upper end surface of the gas bursting test tank through a three-way valve. At the same time, the connecting pipe head of the adjusting pressure plate at the upper end surface of the gas bursting test tank is also connected to the aeration plate through a three-way valve. The aeration plate is embedded in the lower end surface of the adjusting pressure plate, is coaxially distributed with the adjusting pressure plate, and is connected to the cavity of the gas bursting test tank corresponding to the main hydraulic bladder. The hydraulic station is connected to the carrying frame and is respectively connected to the main hydraulic bladder and the auxiliary hydraulic bladder through high-pressure pipelines. In addition, the control valve, the three-way valve, the hydraulic station and the adjusting pressure plate are also electrically connected to the drive circuit.

4. A high-pressure gas explosion and acidification combined integrated test device according to claim 3, characterized in that: The gas explosion test tank includes a tank body, a sealed end cover, an electric heating device, a spring, a pressure sensor, and a temperature sensor, wherein the tank body is a cylindrical hollow tubular structure, and its two ends are connected to the sealed end covers to form a closed cavity structure, and the inner sides of the tank body and the sealed end cover are each provided with at least two springs evenly distributed around the axis of the tank body, wherein the tank body is connected to the outer side of the main hydraulic bladder through the spring, and the sealed end cover is connected to the upper end surface of the auxiliary hydraulic bladder through the spring, and the spring is connected to the tank body and the sealed end cover through the pressure sensor, the electric heating device and the temperature sensor are both embedded in the tank body, evenly distributed around the axis of the tank body, and distributed along the axis direction of the tank body, and the electric heating device, the pressure sensor, and the temperature sensor are all electrically connected to the drive circuit.

5. The high-pressure gas explosion and acidification combined test device according to claim 3 is characterized in that: The regulating pressure plate includes a tray, a pressure sensor, an air pressure sensor, a spring, and an elastic protective net, wherein the tray is a circular groove structure with an "H"-shaped axial cross-section, the upper end face and the lower end face of the tray are connected to an elastic protective net through springs, and the elastic protective net is wrapped outside the end face of the tray and coaxially distributed with the tray, and the spring is connected to the tray through at least three pressure sensors evenly distributed around the axis of the tray, and at the same time, the aeration plate and the three-way valve are embedded in the groove body on the lower end face of the tray and connected to the bottom of the groove, and an air pressure sensor is provided at the connection between the three-way valve, the aeration plate and the elastic guide pipe, and the pressure sensor and the air pressure sensor are electrically connected to the drive circuit.

6. A high-pressure gas explosion and acidification combined integrated test device according to claim 1 or 3, characterized in that: The tail material collection mechanism includes a collection tank, a liquid level sensor, a pH sensor, a drainage fan, and an air pressure sensor. There is at least one collection tank, which is connected to the drainage fan through a guide pipe. At the same time, the drainage fan is also connected to the connecting pipe head on the lower end surface of the gas explosion test tank of the test bench through the guide pipe. The liquid level sensor, pH sensor, and air pressure sensor are all located in the collection tank, wherein the air pressure sensor is connected to the top of the collection tank, and the liquid level sensor and pH sensor are both connected to the inner surface of the side wall of the collection tank. There are a number of pH sensors, which are evenly distributed in the vertical direction. At the same time, the liquid level sensor, pH sensor, drainage fan, and air pressure sensor are all electrically connected to the drive circuit.

7. The method for using the high-pressure gas explosion and acidification combined integrated test device according to claim 1 is characterized in that: The driving circuit is a circuit system based on a programmable controller, and a serial communication circuit is also provided in the driving circuit.

8. The method for using the high-pressure gas explosion and acidification combined integrated test device according to claim 1 is characterized in that: The method for using the high-pressure gas blasting and acidizing combined integrated test device comprises the following steps: S1, system construction, first assemble the gas booster, acid storage tank, mixing tank, booster pump, test bench, multi-way valve, tail material collection mechanism and drive circuit to obtain a finished test device, and set a corresponding number of test benches according to the type and number of tests in the test process, and connect the test benches in parallel; then, on the one hand, set the working parameters of the gas booster and the test gas pressure; on the other hand, preset the test acid in the acid storage tank for standby; finally, connect the drive circuit with the external power supply system and remote data acquisition system to complete the construction of the test device; S2, test operation. After completing step S1, the test operation can be carried out. During the test operation, the test sample is first installed in the test bench, and the gas fracturing pipe set in the test bench is embedded in the sample and coaxially distributed between the samples; then the test bench is driven to operate, the main hydraulic bladder and auxiliary hydraulic bladder of the test bench are pressurized, and the main hydraulic bladder and auxiliary hydraulic bladder are made to apply axial pressure and circumferential pressure to the sample, and specific test operations can be carried out after the test pressure reaches the set value. The test operation is divided into two types: independent test detection and mixed test detection, specifically: Acid acidification test: First, the acid in the acid storage tank is pressurized by a booster pump, and the acid is adjusted to a constant pressure by a control valve, and then the acid is transported to the test sample through the gas fracturing pipe. Finally, the waste liquid generated by the seepage of the test sample is collected and processed by the tailings collection mechanism. At the same time, during the acid acidification test, the amount of acid in the test piece, the acid concentration and the acid seepage velocity are tested on the one hand; on the other hand, the damage and pore and crack development of the test piece under different conditions are monitored in real time. Sour gas explosion test: First, the gas for external test is pressurized by the gas booster, and the pressurized gas is pressure-regulated by the booster pump and then transported to the mixing tank. At the same time, the acid liquid in the acid storage tank is pressurized by the booster pump and then atomized and sprayed through the mixing tank and then transported to the mixing tank. In the mixing tank, the atomized acid liquid is mixed with the high-pressure gas in proportion and then pressure-regulated again by the booster pump. The pressure-regulated mixed gas is transported to the gas fracturing pipe set up on the test bench and the sample is subjected to fracturing and blasting operations. At the same time, during the sour gas explosion test, on the one hand, parameters such as acid gas concentration and gas flow rate can be tested, and on the other hand, the pressure value and damage form of the fracturing and blasting operation can be detected; Combined test of gas explosion and acidification: First, the gas booster is used to pressurize the external test gas, and the pressurized gas is transported to the test bench after pressure adjustment by the booster pump, driving the gas fracturing pipe set on the test bench to operate and perform fracturing and blasting operations on the sample; and the test bench detects the pressure value and damage form of the fracturing and blasting operation; then after the explosion and when the stress state is stable, the booster pump is driven to operate to pressurize the acid in the acid storage tank, and the pressurized acid is injected into the gas explosion test tank from the top of the gas explosion test tank of the test bench, and continuously sprayed directly onto the upper end surface of the sample, so that the acid flows from top to bottom along the axis of the sample through the sample, and is discharged from the lower end surface of the gas explosion test tank. During the flow of the acid, on the one hand, the amount of acid in the specimen, the acid concentration and the acid seepage velocity are detected; on the other hand, the damage and pore and crack development of the specimen under different conditions are monitored in real time; finally, the tail material collection mechanism collects and treats the tail gas and waste liquid generated by the explosion and acid seepage; S3, data summary, after completing the current test, on the one hand, the data generated by the test is collected and summarized to obtain specific test result data; on the other hand, the test bench is depressurized, the sample is taken out of the test bench, the gas fracturing pipe is replaced, and the equipment is cleaned, and subsequent test operations can be carried out.

9. The method for using the high-pressure gas explosion acidification fracturing test device according to claim 8, characterized in that: In the step S2, the temperature of the test operation is 0-80°C, and the pressure of the main hydraulic bladder and the auxiliary hydraulic bladder set on the test bench during the experiment is not greater than 25MPa.

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