Circular rock sample segmented positioning radial radiation force chemical temperature synergistic effect device and method

Abstract

The invention belongs to the technical field of rock sample tests, and particularly relates to an annular rock sample segmented positioning radial radiation force chemical temperature synergistic effect device and method. According to the device, dynamic and static loads with different gradients, acid-base corrosion effects and temperature stress can be applied to a plurality of segmented annular rock samples, so that rock samples meeting preset standards are provided for rock mechanics tests of subsequent segmented rock samples, and environmental conditions of uneven distribution of stress fields, chemical fields and temperature fields borne by shaft surrounding rock of a kilometer deep well can be simulated; a preposed experimental device foundation can be provided for shaft stability research during development of oil and gas resources and mineral resources, and related research on stability rules of well building projects and shaft surrounding rocks under the action of complex environments is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of rock sample testing, and specifically relates to a radial divergent force-temperature synergistic device and method for segmented positioning of annular rock samples. Background Art

[0002] As shallow resources are exhausted, kilometer-level deep resource mining projects have become the new normal. At present, the depth of coal mining has reached 1500m, the depth of geothermal mining has exceeded 5000m, the depth of metal mining has exceeded 4350m, and the depth of oil and gas resource mining has reached 8800m. Among them, wellbores (such as wellbores for coal mining, geothermal wellbores for geothermal energy development, injection wells for underground storage of carbon dioxide, and fracturing wells for oil and gas mining) are the throat channels connecting various types of oil and gas mineral resources underground with ground transportation equipment. The efficiency of wellbore construction and stability maintenance constitute an extremely important prerequisite for the safe and efficient development of energy and mineral resources.

[0003] The rock mechanics experimental research on annular rock samples is aimed at studying the mechanical properties of surrounding rocks similar to wellbores. However, the radial diffusion permeability treatment of existing annular rock samples is to press the liquid out of the axial hollow hole of the rock sample through the rock sample, so that the liquid penetrates to the outside of the rock sample. It cannot simulate the uneven imbibition effect of fluid fracturing in the real reservoir rock mass, nor can it simulate the comprehensive effect of the complex environmental conditions to which the wellbore is subjected. In addition, the existing experimental device can only process the entire annular rock sample, and cannot reflect the non-uniform and complex situation of the corresponding impact on the wellbore in the process of increasing the permeability of the rock formation, so that the test results cannot reflect the real environmental conditions of the wellbore, which also leads to inaccurate experimental results.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Invention content

[0005] The purpose of the invention is to provide a device and method for the synergistic effect of radial divergence force and temperature on circular ring rock sample segmented positioning, so as to at least solve the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A circular ring-shaped rock sample segmented positioning radial divergent force chemical temperature synergistic device, the device comprising:

[0008] The device frame comprises an annular sleeve, a fixed end plate and a movable end plate, wherein the fixed end plate and the movable end plate are respectively arranged at two ends of the annular sleeve, and the centers of the fixed end plate and the movable end plate are both provided with through holes, and the through holes on the fixed end plate and the movable end plate are coaxial with the center hole of the annular rock sample;

[0009] An energy-absorbing, anti-seepage and heat-insulating component is provided, wherein a plurality of annular rock samples are arranged in parallel inside the annular sleeve, and an energy-absorbing, anti-seepage and heat-insulating component is provided between two adjacent annular rock samples, wherein the cross-sectional shape of the energy-absorbing, anti-seepage and heat-insulating component is consistent with the cross-sectional shape of the annular rock sample;

[0010] A stress wave applying component, wherein the stress wave applying component comprises a plurality of stress loading units, wherein the stress loading units extend into the central hole of the annular rock sample, each stress loading unit is arranged corresponding to one annular rock sample, and each stress loading unit independently applies static stress and / or dynamic stress of set parameters to one annular rock sample;

[0011] A solution application assembly, wherein the solution application assembly comprises a plurality of solution application units, wherein a liquid discharge device of each solution application unit extends into a central hole of the annular rock sample, each solution application unit is arranged corresponding to one annular rock sample, and a central anti-seepage gasket is arranged between the central holes of adjacent annular rock samples; each solution application unit independently applies a solution of set parameters to one annular rock sample through the liquid discharge device;

[0012] A temperature application component, wherein the temperature application component includes a plurality of temperature application units, wherein the temperature application units extend into the center hole of the circular ring-shaped rock sample, each temperature application unit is arranged corresponding to a circular ring-shaped rock sample, and a central insulating gasket is arranged between the center holes of adjacent circular ring-shaped rock samples; each temperature application unit independently applies a temperature of set parameters to a circular ring-shaped rock sample.

[0013] The circular ring-shaped rock sample segmented positioning radial divergent force chemical temperature synergistic action device as described above, preferably, the stress wave application component includes a loading horizontal rod, and a plurality of stress loading units are arranged in parallel on the loading horizontal rod, and the stress loading units are driven by the loading horizontal rod to extend into the central hole of the circular ring-shaped rock sample;

[0014] The stress loading unit at least includes a stress loader, which includes a built-in chip, a built-in telescopic column and a built-in wave conductor. The built-in telescopic column is used to apply static stress to the annular rock sample, and the built-in wave conductor is used to apply dynamic stress waves to the annular rock sample.

[0015] As described above, the annular rock sample segmented positioning radial divergent force and temperature synergistic action device, preferably, the stress wave application component also includes a stress loading computer end and a wave loading computer end, and the built-in chips in the stress loader are electrically connected to the stress loading computer end and the wave loading computer end.

[0016] As described above, the circular ring-shaped rock sample segmented positioning radial divergent force and temperature synergistic action device, preferably, the solution application unit is composed of a liquid storage tank, a pressure pump, a liquid injection port and a liquid discharge device which are connected in sequence through pipelines, and the liquid discharge device extends into the interior of the circular ring-shaped rock sample to release the solution into each circular ring-shaped rock sample.

[0017] As described above, the annular rock sample segmented positioning radial divergent force and temperature synergistic action device is preferably provided with a liquid inlet valve on the pipeline between the liquid storage tank and the booster pump, and the liquid injection port valve and an upper end hydraulic pressure gauge are provided on the pipeline between the booster pump and the liquid injection port.

[0018] As described above, the annular rock sample segmented positioning radial divergent force temperature synergistic action device, preferably, the temperature application unit includes an adjustable resistance wire, a heat collecting tube is arranged on the periphery of the adjustable resistance wire, and the central insulation gasket is arranged between adjacent temperature application units;

[0019] The adjustable resistance wires in each temperature application unit are connected to the temperature controller.

[0020] As described above, the circular ring-shaped rock sample segmented positioning radial divergent force and temperature synergistic action device, preferably, the device also includes a sensor placement film and a sensor data receiver, the sensor placement film is wrapped around the periphery of a plurality of circular ring-shaped rock samples, the sensor placement film is used to transmit the detected data to the sensor data receiver; a sealing soft rubber is arranged between the sensor placement film and the annular sleeve.

[0021] As described above, the annular rock sample segmented positioning radial divergent force and temperature synergistic device, preferably, the sensor placement film is provided with a pressure sensor, a humidity sensor and a temperature sensor;

[0022] The pressure sensor is used to detect the penetration transmission of the stress field applied by the stress loading unit to the annular rock sample;

[0023] The humidity sensor is used to detect the penetration of the chemical field applied by the solution application unit to the annular rock sample;

[0024] The temperature sensor is used to detect the penetration of the temperature field applied by the temperature applying unit to the annular rock sample.

[0025] As described above, the circular rock sample segmented positioning radial divergent force and temperature synergistic action device, preferably, the energy absorbing, anti-seepage and thermal insulation component includes an energy absorbing gasket, an anti-seepage gasket and a thermal insulation gasket arranged in parallel, and a circle of sealing gaskets is arranged on the inner ring of the energy absorbing gasket, the anti-seepage gasket and the thermal insulation gasket.

[0026] The present application also provides a method for the synergistic effect of radial divergence force and temperature on segmented positioning of annular rock samples, the method using the device for synergistic effect of radial divergence force and temperature on segmented positioning of annular rock samples as claimed in claim 9, the method comprising the following steps:

[0027] Step 1: prepare multiple annular rock samples with the same outer dimensions according to the test requirements, place an energy-absorbing, anti-seepage and heat-insulating component between two adjacent annular rock samples, then wrap the sensor placement film around the multiple annular rock samples, and wrap the sealing soft glue around the sensor placement film; then place the assembled multiple annular rock samples in a sleeve, and then fix the fixed end plate, the movable end plate and the sleeve together;

[0028] Step 2, extending the stress loading unit into the central hole of the annular rock sample, and making each stress loading unit correspond to one annular rock sample to perform stress field loading, after the pressure sensor monitors that the peripheral pressure value of the annular rock sample reaches a set value, stopping the stress field loading, and taking the stress loading unit out of the annular rock sample;

[0029] Step 3, extending the temperature application unit into the central hole of the annular rock sample, and making each temperature application unit correspond to one annular rock sample to load the temperature field, after the temperature value of the outer periphery of the annular rock sample monitored by the temperature sensor reaches the set value, stopping the temperature field loading, and taking the temperature application unit out of the annular rock sample;

[0030] Step 4, extending the solution application unit into the central hole of the annular rock sample, and making each solution application unit correspond to one annular rock sample for chemical field loading, after the humidity value of the outer periphery of the annular rock sample monitored by the humidity sensor reaches a set value, stopping the chemical field loading, and taking the solution application unit out of the annular rock sample;

[0031] Step 5, taking out the annular rock sample that has been processed by the stress field, temperature field and chemical field from the device frame, and then continuing to carry out rock mechanics loading test on the annular rock sample.

[0032] Beneficial effects:

[0033] The device can apply dynamic and static loads, acid-base dissolution effects and temperature stresses of different gradients to multiple segmented circular rock samples, so as to provide rock samples that meet predetermined standards for subsequent rock mechanics tests of segmented rock samples. It can simulate the uneven distribution of stress, chemical and temperature fields in the surrounding rocks of kilometer-deep wells, and provide a preliminary experimental device basis for the study of wellbore stability during the development of oil and gas resources and mineral resources, which is conducive to the relevant research on well construction projects and the stability laws of wellbore surrounding rocks under complex environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings constituting part of the present application are used to provide a further understanding of the invention. The exemplary embodiments and descriptions of the invention are used to explain the invention and do not constitute an improper limitation on the invention. Among them:

[0035] Figure 1 A schematic diagram of a circular ring-shaped rock sample segmented positioning radial divergence force temperature synergistic device according to an embodiment of the present invention

[0036] Figure 2 A schematic diagram of a structure for applying a stress field to a device that creates an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of a structure for applying a chemical field to a device that creates an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of the structure of a device for applying a temperature field to create an embodiment of the present invention.

[0039] In the figure:

[0040] 1- Section I liquid storage tank; 2- Section II liquid storage tank; 3- Section III liquid storage tank; 4- Section IV liquid storage tank; 5- Section V liquid storage tank;

[0041] 6- Liquid inlet valve for section Ⅰ; 7- Liquid inlet valve for section Ⅱ; 8- Liquid inlet valve for section Ⅲ; 9- Liquid inlet valve for section Ⅳ; 10- Liquid inlet valve for section Ⅴ;

[0042] 11- Section I booster pump; 12- Section II booster pump; 13- Section III booster pump; 14- Section IV booster pump; 15- Section V booster pump;

[0043] 16-hydraulic gauge at the upper end of section Ⅰ; 17-hydraulic gauge at the upper end of section Ⅱ; 18-hydraulic gauge at the upper end of section Ⅲ; 19-hydraulic gauge at the upper end of section Ⅳ; 20-hydraulic gauge at the upper end of section Ⅴ;

[0044] 21- Valve for liquid injection port of section Ⅰ; 22- Valve for liquid injection port of section Ⅱ; 23- Valve for liquid injection port of section Ⅲ; 24- Valve for liquid injection port of section Ⅳ; 25- Valve for liquid injection port of section Ⅴ;

[0045] 26-liquid injection port for section I; 27-liquid injection port for section II; 28-liquid injection port for section III; 29-liquid injection port for section IV; 30-liquid injection port for section V;

[0046] 31- Liquid injection hose for section I; 32- Liquid injection hose for section II; 33- Liquid injection hose for section III; 34- Liquid injection hose for section IV; 35- Liquid injection hose for section V;

[0047] 36-fixing buckle; 37-support base; 38-butterfly nut; 39-fixed end plate; 40-movable end plate; 41-sleeve; 42-fixed end internal thread; 43-movable end internal thread; 44-fixed end center hole; 45-movable end center hole; 46-sensor data receiver; 47-sealing soft glue; 48-sensor placement film; 49-sealing gasket; 50-energy absorption gasket; 51-anti-seepage gasket; 52-insulating gasket; 53-pressure sensor; 54; humidity sensor; 55-temperature sensor; 56-stress loading computer terminal; 57-wave loading computer terminal; 58-loading level bar;

[0048] 59-Ⅰ section stress loader control device; 60-Ⅱ section stress loader control device; 61-Ⅲ section stress loader control device; 62-Ⅳ section stress loader control device; 63-Ⅴ section stress loader control device;

[0049] 64-Ⅰ section stress loader; 65-Ⅱ section stress loader; 66-Ⅲ section stress loader; 67-Ⅳ section stress loader; 68-Ⅴ section stress loader;

[0050] 69-built-in chip; 70-built-in telescopic column; 71-built-in waveguide; 72-solution application component handle; 73-waste liquid discharge pipeline; 74-liquid pump; 75-waste liquid treatment controller; 76-waste liquid processor; 77-waste liquid collector; 78-fixed end anti-seepage gasket; 79-movable end anti-seepage gasket; 80-inter-section anti-seepage gasket;

[0051] 81-I section drainage equipment; 82-II section drainage equipment; 83-III section drainage equipment; 84-IV section drainage equipment; 85-V section drainage equipment;

[0052] 86- Section I liquid injection hard pipe; 87- Section II liquid injection hard pipe; 88- Section III liquid injection hard pipe; 89- Section IV liquid injection hard pipe; 90- Section V liquid injection hard pipe;

[0053] 91 - temperature application component handle; 92 - temperature controller; 93 - fixed end insulation gasket; 94 - movable end insulation gasket; 95 - insulation gasket between sections; 96 - heat collecting pipe; 97 - adjustable resistance wire. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0055] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0056] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0057] According to the specific embodiments of the present invention, Figure 1-4 As shown, the present invention provides a circular rock sample segmented positioning radial divergence force temperature synergistic device, the device comprises:

[0058] The device frame includes an annular sleeve, a fixed end plate and a movable end plate, the fixed end plate and the movable end plate are respectively arranged at two ends of the annular sleeve, and the centers of the fixed end plate and the movable end plate are provided with through holes, and the through holes on the fixed end plate and the movable end plate are coaxial with the center hole of the circular ring rock sample; in this embodiment, fixed buckles are arranged at both ends of the annular sleeve, and card grooves are arranged on the fixed end plate and the movable end plate, and the fixed buckles at both ends of the annular sleeve are respectively inserted into the card grooves of the fixed end plate and the movable end plate, so as to facilitate the accurate positioning of the annular sleeve and the fixed end plate and the movable end plate; wherein, a plurality of supporting bases are arranged on the side of the fixed end plate away from the movable end plate, and the supporting base is used to fix one end of the threaded rod, and the other end of the threaded rod passes through the movable end plate and is threadedly tightened with a butterfly nut, so that the annular sleeve, the fixed end plate and the movable end plate are relatively fixed.

[0059] In one embodiment of the present application, a fixed end center hole is provided at the center of the fixed end plate, and a fixed end internal thread is provided on the inner wall of the fixed end center hole; a movable end center hole is provided at the center of the movable end plate, and a movable end internal thread is provided on the inner wall of the movable end center hole. In other embodiments, the movable end center hole is smaller than the fixed end center hole, so that after the external device is inserted into the annular rock sample, both ends of the device can be screwed fixed in the movable end center hole and the fixed end center hole at the same time.

[0060] The energy-absorbing, anti-seepage and heat-insulating component has a plurality of annular rock samples arranged in parallel inside the annular sleeve. In the present embodiment, the structure of the annular rock samples is similar to the structure of the wellbore, and the annular rock samples are used to simulate the wellbore. An energy-absorbing, anti-seepage and heat-insulating component is arranged between two adjacent annular rock samples, and the cross-sectional shape of the energy-absorbing, anti-seepage and heat-insulating component is consistent with the cross-sectional shape of the annular rock sample. In the present embodiment, the energy-absorbing, anti-seepage and heat-insulating component is in the shape of an annular ring, which completely separates the two adjacent annular rock samples to play the role of anti-seepage, heat insulation and energy absorption and vibration isolation between the two adjacent annular rock samples.

[0061] A stress wave applying component includes a plurality of stress loading units, each of which extends into a central hole of the annular rock sample, each of which is arranged corresponding to a circular ring-shaped rock sample, and each of which independently applies static stress and / or dynamic stress of set parameters to a circular ring-shaped rock sample.

[0062] A solution application component, the solution application component includes a plurality of solution application units, the drainage device of each solution application unit extends into the central hole of the circular ring-shaped rock sample, each solution application unit is arranged corresponding to a circular ring-shaped rock sample, and a central anti-seepage gasket is arranged between the central holes of adjacent circular ring-shaped rock samples; each solution application unit independently applies a solution of set parameters to a circular ring-shaped rock sample through the drainage device; in this embodiment, a circle of sealing gaskets is arranged on the periphery of the central anti-seepage gasket, which is used to improve the sealing performance of the installation gap of the central anti-seepage gasket; wherein the central anti-seepage gasket includes a fixed end anti-seepage gasket, a movable end anti-seepage gasket and an inter-segment anti-seepage gasket, the fixed end anti-seepage gasket is installed at the central hole of the fixed end, the movable end anti-seepage gasket is installed at the central hole of the movable end, and the inter-segment anti-seepage gasket is installed at the central hole of the energy-absorbing anti-seepage insulation component, so that each circular ring-shaped rock sample is isolated as an independent unit, ensuring that the chemical fields between the two circular ring-shaped rock samples do not interfere with each other.

[0063] The temperature application component includes a plurality of temperature application units, and the temperature application units extend into the center hole of the annular rock sample. Each temperature application unit is set corresponding to an annular rock sample, and a central insulation gasket is set between the center holes of adjacent annular rock samples; each temperature application unit independently applies a temperature of set parameters to an annular rock sample. In this embodiment, a circle of sealing gaskets is set on the periphery of the central insulation gasket to improve the sealing of the installation gap of the central insulation gasket; wherein the central insulation gasket includes a fixed end insulation gasket, a movable end insulation gasket and an insulation gasket between sections, the fixed end insulation gasket is installed at the center hole of the fixed end, the movable end insulation gasket is installed at the center hole of the movable end, and the insulation gasket between sections is installed at the center hole of the energy-absorbing and anti-seepage insulation component, so that each annular rock sample is isolated as an independent unit, ensuring that the temperature fields between the two annular rock samples do not interfere with each other.

[0064] In the device, static stress and / or dynamic stress with different parameters are first applied to multiple annular rock samples through multiple stress loading units in the stress wave application assembly; the static stress applied is used to simulate the hydraulic fracturing process of coal reservoirs. After drilling, the equilibrium state of the original stress near the wellbore is destroyed, causing the ground stress to be redistributed near the wellbore. Due to the local disturbance of the wellbore to the ground stress, the maximum horizontal principal stress is distributed in an annular shape along the circumference of the wellbore, and the minimum horizontal principal stress is distributed radially along the wellbore; the dynamic stress is used to simulate the process of using the explosion method to increase the fracture and permeability of the reservoir rock to be mined to improve the recovery rate, and the dynamic stress wave is generated to cause impact damage to the surrounding rock of the wellbore.

[0065] Then, solutions with different parameter ratios and pressures are applied to multiple circular rock samples through multiple solution application units in the solution application assembly; the solution is used to simulate the use of chemical transformation methods, including acidification and alkaline chemical stimulation, to inject acidic liquid / alkaline liquid into the reservoir through the wellbore to dissolve the minerals in the reservoir and achieve the purpose of improving fracture connectivity and permeability. In the process, various acid and alkaline solutions often cause mineral dissolution effects on the surrounding rocks of the wellbore during transportation or leakage, affecting the stability of the inner wall of the wellbore and the integrity of the wellbore.

[0066] Finally, different temperatures are applied to the multiple annular rock samples through the multiple temperature applying units in the temperature applying assembly to simulate the different geothermal effects on wellbores at different depths.

[0067] An energy-absorbing, anti-seepage and heat-insulating component is set between any two adjacent circular rock samples to prevent penetration, isolate heat, absorb energy and isolate vibration, so as to avoid mutual influence between stress field, temperature field and chemical field between the two adjacent circular rock samples.

[0068] That is, the device can apply dynamic and static loads, acid-base dissolution effects and temperature stresses of different gradients to multiple segmented circular rock samples, so as to provide rock samples that meet the predetermined standards for subsequent rock mechanics tests of segmented rock samples. It can simulate the uneven distribution of stress, chemical and temperature fields in the surrounding rocks of kilometer-deep wells, and provide a basis for pre-experimental devices for wellbore stability research during the development of oil and gas resources and mineral resources, which is conducive to the relevant research on well construction projects and the stability laws of wellbore surrounding rocks under complex environmental conditions.

[0069] The stress wave applying assembly includes a loading horizontal rod, and a plurality of stress loading units are arranged in parallel on the loading horizontal rod. The stress loading units are driven by the loading horizontal rod to extend into the center hole of the circular ring rock sample. In this embodiment, the loading horizontal rod is inserted into the circular ring rock sample from the center hole of the fixed end, and each stress loading unit is located in a circular ring rock sample.

[0070] The stress loading unit at least includes a stress loader, which includes a built-in chip, a built-in telescopic column and a built-in wave conductor. The built-in telescopic column is used to apply static stress to the annular rock sample, and the built-in wave conductor is used to apply dynamic stress waves to the annular rock sample.

[0071] The stress wave applying component also includes a stress loading computer end and a wave loading computer end. The built-in chips in the stress loader are electrically connected to the stress loading computer end and the wave loading computer end.

[0072] In one embodiment of the present application, the stress loading computer terminal and the wave loading computer terminal are used to send signals to the built-in chip to control the action parameters of the built-in telescopic column and the built-in wave conductor. In other embodiments, the built-in chips in the stress loader are all connected to the stress loading computer terminal and the wave loading computer terminal signal.

[0073] During static stress loading, the stress adjustment computer sends instructions to the built-in chip of the stress loader, thereby controlling the built-in telescopic column of the stress loader and completing the loading. Energy-absorbing gaskets built into each section can effectively block the interference between the segmented circular rock samples.

[0074] During dynamic stress loading, it is necessary to set the waveform and various characteristics of the wave you want to apply on the wave loading computer before loading (elastic waves: can be divided into compression waves (P waves) and shear waves (S waves) in rocks. Frequency: The frequency range is wide, ranging from a few hertz to several thousand hertz or even higher, depending on the source. For example, the commonly used frequency in seismic exploration is around 10-100Hz, the frequency of blasting surrounding rock in underground well construction projects is between 30Hz and 100Hz, and the frequency of high-energy gas explosion during coalbed methane reservoir fracturing is between 60Hz and 300Hz. Hz. Amplitude: The amplitude is related to the energy of the earthquake source. The elastic wave amplitude produced by a strong earthquake source is larger. In earthquake research, the amplitude of P waves and S waves produced by strong earthquakes can cause obvious ground shaking. Other characteristics: P waves travel faster and can pass through solids, liquids and gases; S waves travel slower than P waves and can only pass through solids. By measuring parameters such as the arrival time difference of P waves and S waves, the properties and structure of rocks can be inferred. Ultrasonic wave: Sound waves with a frequency higher than the upper limit of human hearing (about 20kHz). Frequency: Usually in the range of tens of kHz to several MHz In rock detection, different frequencies may be selected according to different detection purposes and rock characteristics, such as 50kHz-500kHz. Amplitude: The amplitude determines the energy intensity of the ultrasonic wave, and the amplitude is different in different detection equipment and application scenarios. Other characteristics: It has the characteristics of good directionality and strong penetration ability. In rock mechanics experiments, it can be used to detect defects and cracks inside the rock. Seismic waves (which can be regarded as a special elastic wave): include body waves (P waves and S waves) and surface waves (such as Rayleigh waves and Love waves). Frequency: From a few hertz at low frequencies to tens of hertz at high frequencies. The seismic waves generated by large earthquakes have more low-frequency components, while the seismic waves generated by small earthquakes or artificial sources have relatively high frequencies. Amplitude: The amplitude of seismic waves generated by large earthquakes is very large, which may cause serious damage to surface buildings; the amplitude of small earthquakes and underground well blasting construction is smaller. Other characteristics: Surface waves propagate along the surface of the earth, and their energy is mainly concentrated near the surface, causing greater damage to surface buildings. The propagation speed and attenuation characteristics of seismic waves in different rock formations are different, which is an important basis for seismic exploration. )

[0075] Specifically, by sending the wave type and its corresponding characteristic instructions to the built-in chip of the stress loader on the wave loading computer side, the built-in wave conductor of the stress loader can be controlled to control the transmission of the wave and complete the application of the wave. The energy-absorbing gaskets built in between each section can effectively block the interference between the segmented specimens.

[0076] In this embodiment, the stress loading unit also includes a loader control device. Since the height of each annular rock sample is 20 mm, the width of each section stress loader is set to 5 mm. Therefore, the stress loading computer sends commands to each section stress loader control device, and controls each section micro stress loader to move four times in sequence to achieve complete coverage of the annular rock sample in the section. In other embodiments, the loading horizontal rod can also be directly driven to move forward a set distance until the entire loading process of the rock sample stress in the section is completed.

[0077] The solution application unit is composed of a liquid storage tank, a pressure pump, a liquid injection port and a liquid discharge device which are sequentially connected through pipelines. The liquid discharge device extends into the inside of the circular rock sample to release the solution into each circular rock sample.

[0078] A liquid inlet valve is arranged on the pipeline between the liquid storage tank and the booster pump, and a liquid injection port valve and an upper end hydraulic pressure gauge are arranged on the pipeline between the booster pump and the liquid injection port.

[0079] In one embodiment of the present application, an injection hose is connected downstream of the injection port, the injection hose extends to the center hole of the fixed end, and an injection hard pipe is connected downstream of the injection hose. The end of the injection hard pipe is connected to a drainage device, and the drainage device can be a valve; that is, the injection hard pipes of each solution application unit are respectively connected to the injection systems corresponding to different injection hoses, and the segmented injection of multiple liquids can be achieved by controlling the type of liquid installed in the liquid storage tank of each section. The injection of liquids under different pressures can also be achieved by adjusting the pressure pump of each section and the hydraulic gauge at the upper end of each section, and finally the injection of liquids with different pressures in the sections is achieved.

[0080] In this embodiment, the solution application component also includes a waste liquid discharge pipe, a liquid suction pump, a waste liquid treatment controller, a waste liquid treatment device and a waste liquid collector; the waste liquid discharge pipe extends into the interior of each circular rock sample, and after the pressure is released at the center hole of the fixed end, the liquid suction pump draws the unpenetrated liquid into the waste liquid treatment device, and the waste liquid treatment controller treats the liquid and discharges it into the waste liquid collector.

[0081] In this embodiment, each liquid discharge device is arranged in parallel on the handle of the solution application component, and each liquid discharge device is extended into the corresponding annular rock sample by driving the handle of the solution application component.

[0082] The temperature application unit includes an adjustable resistance wire, a heat collecting tube is arranged on the periphery of the adjustable resistance wire, and a central insulation gasket is arranged between adjacent temperature application units; the adjustable resistance wire in each temperature application unit is connected to a temperature controller. In one embodiment of the present application, the temperature of the temperature application unit is adjusted by adjusting the length and / or thickness of the adjustable resistance wire; wherein the adjustable resistance wire in each temperature application unit can be connected in series to the temperature controller, so that the temperature controller can simultaneously control the adjustable resistance wires in each temperature application unit to work simultaneously.

[0083] In this embodiment, each temperature application unit is arranged in parallel on the handle of the temperature application component, and each temperature application unit is extended into the corresponding circular ring-shaped rock sample by driving the handle of the temperature application component.

[0084] The device also includes a sensor placement film and a sensor data receiver. The sensor placement film is wrapped around the periphery of multiple annular rock samples. The sensor placement film is used to transmit the detected data to the sensor data receiver. A sealing soft glue is arranged between the sensor placement film and the annular sleeve. In one embodiment of the present application, the sensor data receiver is located outside the device frame, and the sensor placement film is arranged on the periphery of the annular rock sample, which is more convenient for detecting the penetration of the stress field, chemical field and temperature field to the annular rock sample from the periphery of the annular rock sample. The sealing soft glue is used to protect the sensor placement film.

[0085] A pressure sensor, a humidity sensor and a temperature sensor are arranged on the sensor placement film; the pressure sensor is used to detect the penetration and transmission of the stress field applied by the stress loading unit to the annular rock sample; in this embodiment, when the stress loading unit applies static stress and dynamic stress inside the annular rock sample, the stress field changes inside the annular rock sample, and the pressure sensor monitors the change of force outside the annular rock sample, then the penetration of the stress field loading of the annular rock sample by the stress loading unit can be inferred, thereby determining the time to end the stress field loading.

[0086] The humidity sensor is used to detect the penetration of the chemical field applied by the solution application unit to the annular rock sample; in the present embodiment, when the solution application unit applies the chemical field inside the annular rock sample, the chemical field changes inside the annular rock sample, and the humidity change is monitored by the humidity sensor outside the annular rock sample. The penetration of the chemical field loading of the annular rock sample by the solution application unit can be inferred, thereby determining the timing to end the chemical field loading.

[0087] The temperature sensor is used to detect the penetration of the temperature field applied by the temperature application unit to the annular rock sample. In this embodiment, when the temperature application unit is heating the inside of the annular rock sample, the temperature field changes inside the annular rock sample. By monitoring the temperature change at the periphery of the annular rock sample through the temperature sensor, the penetration of the temperature field loading of the annular rock sample by the temperature application unit can be inferred, thereby determining the timing of ending the temperature field loading.

[0088] The energy-absorbing, anti-seepage and heat-insulating assembly includes an energy-absorbing gasket, an anti-seepage gasket and a heat-insulating gasket arranged in parallel, and a circle of sealing gaskets is arranged on the inner ring of the energy-absorbing gasket, the anti-seepage gasket and the heat-insulating gasket. In one embodiment of the present application, the energy-absorbing gasket can isolate the transmission of the stress field between two adjacent annular rock samples, the anti-seepage gasket can isolate the transmission of the chemical field between two adjacent annular rock samples, and the heat-insulating gasket can isolate the transmission of the temperature field between two adjacent annular rock samples; a circle of sealing gaskets is arranged on the inner ring of the energy-absorbing, anti-seepage and heat-insulating assembly, which can not only improve the integrity of the energy-absorbing, anti-seepage and heat-insulating assembly, but also improve the sealing of the energy-absorbing, anti-seepage and heat-insulating assembly.

[0089] The present application also provides a circular ring-shaped rock sample segmented positioning radial divergence force temperature synergistic method, the method uses the circular ring-shaped rock sample segmented positioning radial divergence force temperature synergistic device, the method comprises the following steps:

[0090] Step 1, prepare multiple annular rock samples with consistent outer dimensions according to test requirements, place an energy-absorbing, anti-seepage and heat-insulating component between two adjacent annular rock samples, then wrap a sensor placement film around the multiple annular rock samples, and wrap a sealing soft rubber around the sensor placement film; then place the assembled multiple annular rock samples in a sleeve, and then fix the fixed end plate and the movable end plate to the sleeve; in this embodiment, the sleeve length is 100mm, first prepare a small cylindrical rock sample (rock type such as granite, limestone, shale, etc.) with a diameter of 50mm and a height of 20mm, and then use a rock sample processing tool to drill a ring in the center of the sample. The center of the ring is consistent with that of the cylindrical sample, but the diameters are set to 10mm, 15mm, 20mm, 25mm, and 30mm respectively, and then drill out the core of the inner part of the ring, and finally retain only the outer annular rock sample. Five circular rock samples with the same outer dimensions are selected and then placed in a loading sleeve, wherein the sleeve is divided into two parts, the upper sleeve can be removed to facilitate the placement of the circular rock samples.

[0091] In other embodiments, any number of annular rock samples can be loaded into the sleeve. For example, when pre-treating a circular rock sample, the height of the circular rock sample is made equal to the height of the sleeve so that the circular rock sample can be just loaded into the sleeve. Since there is only one circular rock sample, there is no need to set up an energy-absorbing, anti-seepage and heat-insulating component in this case. At this time, the whole rock sample is pre-treated by the synergistic effect of force, temperature and humidity. For another example, when pre-treating two circular rock samples, two circular rock samples are made, and the height of the two circular rock samples is half of the height of the sleeve. An energy-absorbing, anti-seepage and heat-insulating component is arranged between the two circular rock samples, and the two circular rock samples are placed in the sleeve of the device frame for mechanical, chemical and thermal synergistic pretreatment; of course, the number of circular rock samples to be pretreated can be selected from 1, 2, 3, 4, 5 or other numbers. When different numbers of circular rock samples are selected, the circular rock samples need to be made into different heights to facilitate the placement of different numbers of circular rock samples into the sleeve of the device frame; that is, the device can pretreat circular rock samples in a variety of different situations, so that the device has a wider range of use.

[0092] In this embodiment, 5 annular rock samples are provided, each of which is a section; wherein the liquid storage tanks include a section I liquid storage tank, a section II liquid storage tank, a section III liquid storage tank, a section IV liquid storage tank, and a section V liquid storage tank;

[0093] The liquid inlet valve includes the liquid inlet valve of section I, the liquid inlet valve of section II, the liquid inlet valve of section III, the liquid inlet valve of section IV, and the liquid inlet valve of section V;

[0094] The booster pumps include the booster pumps for section I, section II, section III, section IV, and section V;

[0095] The upper hydraulic pressure gauge includes the upper hydraulic pressure gauge of section I, the upper hydraulic pressure gauge of section II, the upper hydraulic pressure gauge of section III, the upper hydraulic pressure gauge of section IV, and the upper hydraulic pressure gauge of section V;

[0096] The liquid injection port valves include the liquid injection port valves of section I, the liquid injection port valves of section II, the liquid injection port valves of section III, the liquid injection port valves of section IV, and the liquid injection port valves of section V;

[0097] The liquid injection ports include the liquid injection port for section I, the liquid injection port for section II, the liquid injection port for section III, the liquid injection port for section IV, and the liquid injection port for section V;

[0098] The liquid injection hose includes a liquid injection hose for section I, a liquid injection hose for section II, a liquid injection hose for section III, a liquid injection hose for section IV, and a liquid injection hose for section V;

[0099] The liquid injection hard pipe includes the liquid injection hard pipe of section I, the liquid injection hard pipe of section II, the liquid injection hard pipe of section III, the liquid injection hard pipe of section IV, and the liquid injection hard pipe of section V;

[0100] The stress loader control device includes a section I stress loader control device, a section II stress loader control device, a section III stress loader control device, a section IV stress loader control device, and a section V stress loader control device;

[0101] The stress loader includes a stress loader for section I, a stress loader for section II, a stress loader for section III, a stress loader for section IV, and a stress loader for section V;

[0102] The drainage equipment includes section I drainage equipment, section II drainage equipment, section III drainage equipment, section IV drainage equipment, and section V drainage equipment.

[0103] The equipment in each section is set up corresponding to the circular rock samples in each section, so that each circular rock sample can adjust the required test parameters individually.

[0104] Step 2, extending the stress loading unit into the central hole of the annular rock sample, and making each stress loading unit correspond to one annular rock sample to perform stress field loading, after the pressure sensor monitors that the peripheral pressure value of the annular rock sample reaches a set value, stopping the stress field loading, and taking the stress loading unit out of the annular rock sample;

[0105] Step 3, extending the temperature application unit into the central hole of the annular rock sample, and making each temperature application unit correspond to one annular rock sample to load the temperature field, after the temperature value of the outer periphery of the annular rock sample monitored by the temperature sensor reaches the set value, stopping the temperature field loading, and taking the temperature application unit out of the annular rock sample;

[0106] Step 4, extending the solution application unit into the central hole of the annular rock sample, and making each solution application unit correspond to one annular rock sample for chemical field loading, after the humidity value of the outer periphery of the annular rock sample monitored by the humidity sensor reaches a set value, stopping the chemical field loading, and taking the solution application unit out of the annular rock sample;

[0107] Step 5, taking out the annular rock sample that has been processed by the stress field, temperature field and chemical field from the device frame, and then continuing to carry out rock mechanics loading test on the annular rock sample.

[0108] In one embodiment of the present application, the stress field, temperature field and chemical field applied to each annular rock sample can be different, which is more convenient for simulating the real stress, temperature and chemical conditions of the wellbore at different stages; after applying the stress field, the rock sample can be left to stand for a set time before applying the temperature field. In other embodiments, the order and interval of applying the stress field, temperature field and chemical field can be combined according to the test needs, so as to more realistically simulate the combined influence of the stress field, chemical field and temperature field on the actual wellbore. In fact, it is affected from the inside of the wellbore and slowly spreads to the outside of the wellbore. It is a process of slow penetration of the force, chemical and temperature environment from the inside (inner wall) to the outside (outer wall). The device can realize the radial divergence force, chemical and temperature synergistic pretreatment function of segmented rock samples, and provides a pre-experimental device foundation for the study of wellbore stability during the development of oil and gas resources and mineral resources, which is conducive to the relevant research on well construction engineering and the stability law of wellbore surrounding rocks under the action of complex environments.

[0109] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A circular ring-shaped rock sample segmented positioning radial divergence force chemical temperature synergistic device, characterized in that: The device comprises: The device frame comprises an annular sleeve, a fixed end plate and a movable end plate, wherein the fixed end plate and the movable end plate are respectively arranged at two ends of the annular sleeve, and the centers of the fixed end plate and the movable end plate are both provided with through holes, and the through holes on the fixed end plate and the movable end plate are coaxial with the center hole of the annular rock sample; An energy-absorbing, anti-seepage and heat-insulating component is provided, wherein a plurality of annular rock samples are arranged in parallel inside the annular sleeve, and an energy-absorbing, anti-seepage and heat-insulating component is provided between two adjacent annular rock samples, wherein the cross-sectional shape of the energy-absorbing, anti-seepage and heat-insulating component is consistent with the cross-sectional shape of the annular rock sample; A stress wave applying component, wherein the stress wave applying component comprises a plurality of stress loading units, wherein the stress loading units extend into the central hole of the annular rock sample, each stress loading unit is arranged corresponding to one annular rock sample, and each stress loading unit independently applies static stress and / or dynamic stress of set parameters to one annular rock sample; A solution application assembly, wherein the solution application assembly comprises a plurality of solution application units, wherein a liquid discharge device of each solution application unit extends into a central hole of the annular rock sample, each solution application unit is arranged corresponding to one annular rock sample, and a central anti-seepage gasket is arranged between the central holes of adjacent annular rock samples; each solution application unit independently applies a solution of set parameters to one annular rock sample through the liquid discharge device; A temperature application component, wherein the temperature application component includes a plurality of temperature application units, wherein the temperature application units extend into the center hole of the circular ring-shaped rock sample, each temperature application unit is arranged corresponding to a circular ring-shaped rock sample, and a central insulating gasket is arranged between the center holes of adjacent circular ring-shaped rock samples; each temperature application unit independently applies a temperature of set parameters to a circular ring-shaped rock sample.

2. The circular ring-shaped rock sample segmented positioning radial divergence force chemical temperature synergistic device according to claim 1 is characterized in that: The stress wave applying assembly comprises a loading horizontal rod, and a plurality of stress loading units are arranged in parallel on the loading horizontal rod, and the stress loading units are driven by the loading horizontal rod to extend into the central hole of the annular rock sample; The stress loading unit at least includes a stress loader, which includes a built-in chip, a built-in telescopic column and a built-in wave conductor. The built-in telescopic column is used to apply static stress to the annular rock sample, and the built-in wave conductor is used to apply dynamic stress waves to the annular rock sample.

3. The circular ring-shaped rock sample segmented positioning radial divergence force chemical temperature synergistic device according to claim 2 is characterized in that: The stress wave applying component also includes a stress loading computer end and a wave loading computer end, and the built-in chips in the stress loader are electrically connected to the stress loading computer end and the wave loading computer end.

4. The circular ring-shaped rock sample segmented positioning radial divergence force chemical temperature synergistic device according to claim 2 is characterized in that: The solution applying unit is composed of a liquid storage tank, a pressure pump, a liquid injection port and a liquid discharge device which are sequentially connected through pipelines. The liquid discharge device extends into the inside of the annular rock sample and is used to release the solution into each annular rock sample.

5. The circular ring-shaped rock sample segmented positioning radial divergent force chemical temperature synergistic device according to claim 4 is characterized in that: A liquid inlet valve is arranged on the pipeline between the liquid storage tank and the booster pump, and a liquid injection port valve and an upper end hydraulic pressure gauge are arranged on the pipeline between the booster pump and the liquid injection port.

6. The circular ring-shaped rock sample segmented positioning radial divergence force chemical temperature synergistic device according to claim 4 is characterized in that: The temperature applying unit comprises an adjustable resistance wire, a heat collecting pipe is arranged on the periphery of the adjustable resistance wire, and the central heat insulating gasket is arranged between adjacent temperature applying units; The adjustable resistance wires in each temperature application unit are connected to the temperature controller.

7. The circular ring-shaped rock sample segmented positioning radial divergence force chemical temperature synergistic device according to claim 6 is characterized in that: The device also includes a sensor placement film and a sensor data receiver. The sensor placement film is wrapped around the periphery of multiple annular rock samples and is used to transmit detected data to the sensor data receiver. A sealing soft glue is arranged between the sensor placement film and the annular sleeve.

8. The circular ring-shaped rock sample segmented positioning radial divergent force and temperature synergistic device according to claim 7 is characterized in that: The sensor placement film is provided with a pressure sensor, a humidity sensor and a temperature sensor; The pressure sensor is used to detect the penetration transmission of the stress field applied by the stress loading unit to the annular rock sample; The humidity sensor is used to detect the penetration of the chemical field applied by the solution application unit to the annular rock sample; The temperature sensor is used to detect the penetration of the temperature field applied by the temperature applying unit to the annular rock sample.

9. The circular ring-shaped rock sample segmented positioning radial divergence force chemical temperature synergistic device according to claim 8 is characterized in that: The energy-absorbing, anti-seepage and heat-insulating assembly comprises an energy-absorbing gasket, an anti-seepage gasket and a heat-insulating gasket arranged in parallel, and a circle of sealing gaskets is arranged on the inner rings of the energy-absorbing gasket, the anti-seepage gasket and the heat-insulating gasket.

10. A method for the synergistic effect of radial divergence force, chemical and thermal factors on circular ring-shaped rock samples in segmented positioning, characterized in that: The method uses the annular rock sample segmented positioning radial divergent force temperature synergistic action device according to claim 9, and the method comprises the following steps: Step 1: prepare multiple annular rock samples with the same outer dimensions according to the test requirements, place an energy-absorbing, anti-seepage and heat-insulating component between two adjacent annular rock samples, then wrap the sensor placement film around the multiple annular rock samples, and wrap the sealing soft glue around the sensor placement film; then place the assembled multiple annular rock samples in a sleeve, and then fix the fixed end plate, the movable end plate and the sleeve together; Step 2, extending the stress loading unit into the central hole of the annular rock sample, and making each stress loading unit correspond to one annular rock sample to perform stress field loading, after the pressure sensor monitors that the peripheral pressure value of the annular rock sample reaches a set value, stopping the stress field loading, and taking the stress loading unit out of the annular rock sample; Step 3, extending the temperature application unit into the central hole of the annular rock sample, and making each temperature application unit correspond to one annular rock sample to load the temperature field, after the temperature value of the outer periphery of the annular rock sample monitored by the temperature sensor reaches the set value, stopping the temperature field loading, and taking the temperature application unit out of the annular rock sample; Step 4, extending the solution application unit into the central hole of the annular rock sample, and making each solution application unit correspond to one annular rock sample for chemical field loading, after the humidity value of the outer periphery of the annular rock sample monitored by the humidity sensor reaches a set value, stopping the chemical field loading, and taking the solution application unit out of the annular rock sample; Step 5, taking out the annular rock sample that has been processed by the stress field, temperature field and chemical field from the device frame, and then continuing to carry out rock mechanics loading test on the annular rock sample.

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