CN111208021A

CN111208021A - Liquid phase discharge shock wave rock breaking experimental system

Info

Publication number: CN111208021A
Application number: CN202010021031.0A
Authority: CN
Inventors: 张辉; 刘科柔; 李军; 蔡志翔; 余庆
Original assignee: China University of Petroleum Beijing
Current assignee: China University of Petroleum Beijing
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2020-05-29
Anticipated expiration: 2040-01-09
Also published as: CN111208021B

Abstract

The application provides a broken rock experimental system of liquid phase discharge shock wave includes: box and pulse power supply unit to and set up in the box: a discharge base having a hollow structure; a rotary device, comprising: rotating the table top; a motor; the coupling is used for connecting the motor and the rotary table top; a liquid phase discharge generating mechanism comprising: the electrode pair is electrically connected with the pulse power supply device, a gap is formed between the two electrodes, and the midpoint of the gap is a discharge center and is positioned right above the rock; an electrode mounting device comprising: an electrode positioning column for positioning the electrode; the electrode horizontal positioning mechanism is used for adjusting the size of the gap; a sensor mounting device comprising: a pressure sensor; and the sensor positioning mechanism is used for adjusting the horizontal distance between the pressure sensor and the discharge center. This application is guaranteeing under the stable condition of going on of liquid phase pulse discharge, can also adjust the regulation of the parameter of multiple influence discharge, can acquire the shock wave pressure apart from the different positions departments in center of discharging simultaneously.

Description

Liquid phase discharge shock wave rock breaking experimental system

Technical Field

The application relates to the technical field of drilling, in particular to a liquid-phase discharge shock wave rock breaking experimental system.

Background

When an oil field drills in a deep well hard stratum, because stratum rocks have the characteristics of compactness, strong abrasiveness and poor drillability, the problems of low drilling speed, serious abrasion of a drill bit and the like exist, the drilling cost is high, and the economic benefit brought by drilling and the development speed of an oil-gas field are restricted.

The liquid-electricity effect is that high-power pulse technology is utilized to form short pulse high voltage between discharge electrodes, the pulse high voltage breaks through liquid phase medium to generate a plasma channel, and when electric energy is injected into the channel, high temperature and high voltage can be generated, so that the channel expands outwards to generate pulse pressure waves (shock waves). The pressure of shock wave generated by the liquid electricity effect can reach 10GPa at most, and hard rock can be broken. At present, the mode that adopts the electrohydraulic effect to combine together with traditional rotary drilling is usually drilled a well, places the discharge electrode at the drill bit tip, utilizes the pulse shock wave that produces to assist the drill bit broken rock, and this has apparent effect to broken rock, reduces drill bit wearing and tearing and the migration of detritus.

The magnitude of shock wave pressure generated by the hydro-electric effect is affected by factors such as: relative rotational speed between the drill bit and the rock, pulse voltage parameters, electrode spacing, electrode shape, etc. In order to further increase the speed of drilling operations, it is necessary to study the factors that influence shock wave pressure. Because the liquid phase pulse discharge experiment environment is extremely extreme, the safety is difficult to guarantee, and meanwhile, the parameter adjustment is difficult to carry out under the extreme experiment environment. Therefore, it is necessary to provide an experimental system capable of adjusting discharge parameters under the condition of ensuring stable liquid-phase discharge.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.

Disclosure of Invention

For solving above-mentioned at least one technical problem, this application provides a broken rock experimental system of liquid phase discharge shock wave, can guarantee that liquid phase pulse discharges and go on steadily, can also adjust the regulation of the parameter that multiple influence discharged, can acquire the shock wave pressure apart from the different positions departments in center of discharging simultaneously.

In order to achieve the above object, the technical solution provided by the present application is as follows:

a liquid phase discharge shock wave rock breaking experiment system, the experiment system includes: the pulse power supply device comprises a box body, a pulse power supply device for providing pulse voltage, and a pulse power supply device arranged in the box body, wherein:

the discharge base is of a hollow structure and comprises a fixed table top;

a rotary device, comprising: the rotary table top is arranged on the fixed table top and used for placing rocks; a motor located within the discharge base; the motor is used for driving the rotary table board to rotate through the coupler;

a liquid phase discharge generating mechanism comprising: an electrode pair electrically connected to the pulse power supply device, the electrode pair comprising: the two electrodes are positioned at the same height relative to the fixed table top, a gap is formed between the two electrodes, the midpoint of the gap is a discharge center, and the discharge center is positioned right above the rock;

an electrode mounting device comprising: an electrode positioning post for positioning an electrode; the electrode horizontal positioning mechanism is used for adjusting the size of the gap;

a sensor mounting device comprising: the pressure sensor is electrically connected with the oscilloscope; and the sensor positioning mechanism is used for adjusting the horizontal distance between the pressure sensor and the discharge center.

As a preferred embodiment, an electrode vertical positioning mechanism is disposed between the discharge base and the electrode positioning column, and the electrode vertical positioning mechanism is used for adjusting the height of the electrode positioning column.

As a preferred embodiment, the electrode horizontal positioning mechanism includes: the sliding block is connected with the electrode through an electrode rod; the electrode positioning column is provided with a plurality of mounting holes used for accommodating the sliding block, the sliding block can move relative to the mounting holes, the size of the outer contour of the sliding block is larger than that of the mounting holes, and the mounting holes are arranged along the height direction of the electrode positioning column.

As a preferred embodiment, the experimental system comprises a flow rate simulation device, the flow rate simulation device comprising:

the guide support is assembled on the electrode positioning column and provided with at least one guide hole, and the guide hole extends towards the gravity direction or the guide hole extends towards the direction vertical to the gravity direction;

the water outlet of the water pump is communicated with at least one flow guide hole, and the water inlet of the water pump is communicated with the box body;

and the second control unit is used for controlling the flow rate of the water pump.

As a preferred embodiment, the rotating device further comprises a rock clamping mechanism for stabilizing rock, the rock clamping mechanism comprising: two pairs of oppositely arranged positioning long grooves arranged on the rotary table top; the clamping plate is arranged on the rotary table top and matched with the positioning long groove, the clamping plate can be positioned in the extending direction of the positioning long groove, and the clamping plate and the positioning long groove are fixed through a fastener.

As a preferred embodiment, the sensor positioning mechanism includes:

a sensor base;

one end of the first positioning rod is connected with the discharge base, the other end of the first positioning rod is connected with the sensor base, and the pressure sensor can adjust the horizontal distance relative to the discharge center through the first positioning rod;

one end of the second positioning rod is connected with the discharging base, the other end of the second positioning rod is fixed with the pressure sensor, and the pressure sensor can adjust the height relative to the fixed table board through the second positioning rod.

As a preferred embodiment, the experimental system further comprises a rock evaluation device for detecting the damage degree of the liquid phase discharge shock wave to the rock, and the rock evaluation device comprises: the device comprises an acoustic wave emission instrument, a longitudinal wave probe and the oscilloscope, wherein the emission end of the longitudinal wave probe is electrically connected with the acoustic wave emission instrument, and the receiving end of the longitudinal wave probe is connected with the oscilloscope.

A liquid phase discharge shock wave rock breaking experiment system, the experiment system includes:

a pulse power supply device for supplying a pulse voltage;

a discharge base including a fixed mesa;

a sensor mounting device comprising: the pressure sensor is electrically connected with the oscilloscope; a sensor positioning mechanism for adjusting the horizontal spacing of the pressure sensor relative to the discharge center;

the medium reaction barrel is positioned on the fixed table top, a containing chamber for bearing liquid medium is arranged in the medium reaction barrel, and the rock, the liquid-phase discharge generating mechanism and the sensor mounting device are positioned in the containing chamber.

As a preferred embodiment, the electrode horizontal positioning mechanism includes: the sliding block is connected with the electrode through an electrode rod; the mounting hole is formed in the electrode positioning column and used for accommodating the sliding block, the sliding block can move relative to the mounting hole, and the size of the outer contour of the sliding block is larger than that of the mounting hole; the side wall of the medium reaction barrel is provided with a groove matched with the sliding block, and the electrode rod can place the electrode in the accommodating cavity of the medium reaction barrel through the groove.

In a preferred embodiment, the sensor positioning mechanism is embodied as a plurality of sensor holders disposed in the accommodating chamber, and the plurality of sensor holders correspond to different horizontal positions with respect to the discharge center.

Has the advantages that:

the liquid phase discharge impact rock breaking experiment system in the embodiment of the application comprises a pulse power supply device and a box body. The pulse power supply device can set pulse voltage parameters, provide pulse voltage required by experiments, and can be used for simulating the influence of the pulse voltage parameters on shock wave pressure. The box body comprises a rotating device, a liquid-phase discharge generating mechanism, an electrode mounting device and a sensor mounting device. The rotating device in the embodiment of the application can simulate the relative rotation between the rock and the electrode, so that the actual operation scene can be more truly approached.

Wherein, the electrode installation device is provided with an electrode positioning column and an electrode horizontal positioning mechanism. In the experimental process, a pair of electrodes in a certain shape can be selected and positioned on the electrode positioning columns, and the electrode horizontal positioning mechanism can adjust the size of a gap between the electrode pairs and can be used for researching the influence of the electrode spacing on the shock wave pressure. The sensor mounting device comprises a pressure sensor and a sensor positioning mechanism. The sensor positioning mechanism is used for adjusting the horizontal spacing of the pressure sensor relative to the discharge center. The pressure sensor is electrically connected with the oscilloscope, so that a change curve of the shock wave pressure along with time is obtained. The change curve of the shock wave pressure at different positions from the discharge center along with the time can be obtained through the matching of the pressure sensor and the sensor positioning mechanism.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive labor.

FIG. 1 is a schematic diagram of a liquid-phase discharge shock wave rock breaking experimental system according to a first embodiment of the present application;

FIG. 2 is a schematic structural view of an electrode mounting apparatus and a sensor mounting apparatus according to a first embodiment of the present application;

FIG. 3 is a cross-sectional view taken at A in FIG. 2;

FIG. 4 is a cross-sectional view taken at B of FIG. 2;

FIG. 5 is a schematic view of the structure of FIG. 2 with a flow guide bracket added;

FIG. 6 is a cross-sectional view at C of FIG. 5;

FIG. 7 is a schematic structural view of an electrode mounting apparatus and a sensor mounting apparatus according to a second embodiment of the present application;

fig. 8 is a plan view of an electrode mounting device and a sensor mounting device according to a second embodiment of the present application.

Description of reference numerals: 1. a second control unit; 2. a water pump; 3. a water outlet; 4. a water inlet; 5. an oscilloscope; 6. a signal modulation instrument; 7. a box body; 8. a pump station; 9. a first control unit; 10. a straight electrode bar; 11. a flow guide bracket; 12. a flow guide hole; 13. an electrode; 14. a layer of insulating material; 15. a main clamping plate; 16. a rock; 17. an auxiliary clamping plate; 18. a pressure sensor; 19. a second positioning rod; 20. rotating the table top; 21. a motor; 22. a coupling; 23. a slider; 24. an electrode positioning post; 25. fixing the table top; 26. a ground copper bar; 27. a pulse power supply device; 28. a slider positioning bolt; 29. an electrode bar positioning nut; 30. mounting holes; 31. a discharge base; 32. a vertical positioning groove; 33. positioning the mounting plate; 34. a sensor base; 35. a sensor positioning rod positioning bolt; 36. a first positioning rod; 37. positioning the long groove; 38. a clamping plate positioning bolt; 39. a vertical direction flow guide hole; 40. a horizontal direction flow guide hole; 41. a sensor holder; 42. bending the electrode bar; 43. a medium reaction barrel; 44. a sensor wire slot; 45. a groove; 46. a rock positioning floor; 100. an electrode horizontal positioning mechanism; 101. a sensor positioning mechanism.

Detailed Description

While the invention will be described in detail with reference to the drawings and specific embodiments, it is to be understood that these embodiments are merely illustrative of and not restrictive on the broad invention, and that various equivalent modifications can be effected therein by those skilled in the art upon reading the disclosure.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The liquid phase discharge shock wave rock breaking experimental system of the embodiment of the invention will be explained and explained with reference to fig. 1 to 8. It should be noted that, for convenience of description, like reference numerals denote like parts in the embodiments of the present invention. And for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments, and the descriptions of the same components may be mutually referred to and cited.

Specifically, the upward direction illustrated in fig. 1 to 8 is defined as "up", and the downward direction illustrated in fig. 1 to 8 is defined as "down". It should be noted that the definitions of the directions in the present specification are only for convenience of explaining the technical solution of the present invention, and do not limit the directions of the liquid phase discharge shock wave rock breaking experimental system of the embodiment of the present invention in other scenarios that may cause the orientation of the device to be reversed or the position of the device to be changed, including but not limited to use, test, transportation, and manufacture.

Referring to fig. 1 and 2, a liquid phase discharge shock wave rock breaking experimental system provided in a first embodiment of the present application includes: a case 7 and a pulse power supply device 27 for supplying a pulse voltage, and disposed inside the case 7: a discharge base 31 having a hollow structure, the discharge base 31 including a fixing table 25; a rotary device, comprising: a rotary table top 20 arranged on the fixed table top 25 for placing the rock 16; a motor 21 located within the discharge base 31; the coupler 22 is used for connecting the motor 21 and the rotating table top 20, the fixed table top 25 is provided with an assembly hole matched with the coupler 22, and the motor 21 can drive the rotating table top 20 to rotate through the coupler 22; a liquid phase discharge generating mechanism comprising: a pair of electrodes 13 electrically connected to the pulse power supply device 27, the pair of electrodes 13 comprising: two electrodes 13 which are positioned at the same height relative to the fixed table top 25, wherein a gap is formed between the two electrodes 13, the midpoint of the gap is a discharge center, and the discharge center is positioned right above the rock 16; an electrode mounting device comprising: an electrode positioning post 24, the electrode positioning post 24 being used for positioning the electrode 13; an electrode horizontal positioning mechanism 100 for adjusting the size of the gap; a sensor mounting device comprising: the pressure sensor 18, the said pressure sensor 18 electrical behavior connects oscilloscope 5; a sensor positioning mechanism 101 for adjusting the horizontal spacing of the pressure sensor 18 with respect to the discharge center.

The pulse power supply device 27 is located outside the box 7 and is used for providing pulse voltage required by the experiment. The pulse power supply device 27 can set pulse voltage parameters and can be used for simulating the influence of the pulse voltage parameters on the shock wave pressure. Further, the pulse power supply device 27 can read the pulse voltage and current waveform of the circuit at the time of discharge, thereby being capable of recording the pulse voltage parameter characteristics. The box 7 has a hollow cavity, and the hollow cavity of the box 7 comprises: a discharge base 31, a rotating device, a liquid-phase discharge generating mechanism, an electrode mounting device, and a sensor mounting device. The box body 7 can be made of transparent glass and is used for observing experimental phenomena. The tank 7 may comprise a tank cover to prevent the liquid medium from splashing around during the liquid phase pulse discharge.

In the first embodiment provided in the present application, the tank 7 may be used to provide a liquid phase environment for liquid phase discharge. That is, the discharge base 31, the rotating means, the liquid-phase discharge generating mechanism, the electrode mounting means, and the sensor mounting means may all be located in a liquid-phase environment, thereby providing a discharge condition for the electrodes. Since the liquid-phase discharge generating mechanism discharges in a liquid-phase environment, in some specific embodiments, the box body 7 is made of double-layer explosion-proof glass.

The discharge base 31 is provided with a fixed table 25 for placing the rock 16, and the discharge base 31 and the fixed table 25 are made of insulating materials. The liquid phase discharge generating mechanism is located above the fixed table 25, and specifically, the liquid phase discharge generating mechanism includes: and the pair of electrodes 13 is electrically connected with the pulse power supply device 27, the pair of electrodes 13 comprises two electrodes 13 which are positioned at the same height relative to the fixed table top 25, a gap is formed between the two electrodes 13, the middle point of the gap is a discharge center, and the discharge center is positioned right above the rock 16. Further, the pair of electrodes 13 includes: the first electrode and the second electrode are respectively and electrically connected with the pulse power supply device 27, a grounding copper bar 26 can be further arranged near the bottom of the box body 7, and the electric signal interference caused by the induced electromotive force of part of the pressure sensor 18 can be eliminated. Different from the pulse power supply device 27, the ground copper bar 26 can reduce the intensity of leakage voltage near the pressure sensor 18 due to the interference of induced electromotive force caused by the transient change of the underwater potential, so that the electric signal interference of the pressure sensor 18 is reduced.

In a first embodiment of the present application, as shown in fig. 2 and 3, the experimental system further comprises a rotating device comprising: a motor 21, wherein the motor 21 is positioned below the fixed table-board 25 and is positioned in the hollow structure of the discharge base 31; a rotary table top 20 arranged on the fixed table top 25; the coupler 22 is used for connecting the motor 21 and the rotating table top 20, an assembly hole matched with the coupler 22 is formed in the fixed table top 25, and the motor 21 can drive the rotating table top 20 to rotate through the coupler 22; a first control unit 9 for controlling the rotational speed of said motor 21.

The rotating device is used for driving the rock 16 to rotate, so that the relative rotation between the rock 16 and the electrode 13 can be simulated, and the actual operation scene can be more really approached. The rotary table 20 may be made of an insulating material as a whole, or the surface of the rotary table 20 may be covered with an insulating material to form the insulating material layer 14, which is beneficial to the stability of the discharge between the electrodes during the discharge and does not interfere with the discharge. The motor 21 is located below the stationary table 25 and may be located between the discharge bases 31. That is, in the present embodiment, the internal hollow structure of the discharge base 31 can facilitate installation of the motor 21 and save space. The motor 21 is preferably a hydraulic motor and the coupling 22 is connected to the rotary table 20 through mounting holes in the stationary table 25. In some embodiments, the connection portion of the rotary table 20 and the coupling 22 can be connected by a bolt, and the bolt under the rotary table 20 is connected to the coupling 22 by rotating the rotary table 20.

Further, in this specification, the rotating device further includes: a first control unit 9 outside the tank for controlling the rotational speed of the motor 21, and a pump station 8, which pump station 8 can transmit power to the hydraulic motor via a conduit. The hydraulic motor is driven by hydraulic transmission, and compared with the traditional motor, the hydraulic motor is beneficial to isolating leakage voltage leaked during pulse discharge, and the condition that the traditional motor is broken down by the high voltage leaked by discharge is avoided.

In this embodiment, the rule of influence of the rotating speed in the relative rotation process on the rock breaking effect of the discharge shock wave can be further studied.

In one embodiment, the rotating device further comprises a rock clamping mechanism for stabilizing the rock 16, the rock clamping mechanism comprising: two pairs of oppositely arranged positioning long grooves 37 arranged on the rotary table top 20; and the clamping plate is arranged on the rotary table top 20 and matched with the positioning long groove 37, the clamping plate can be positioned in the extending direction of the positioning long groove 37, and the clamping plate and the positioning long groove 37 are fixed through a fastener.

Specifically, the positioning long groove 37 may have a T-shaped groove extending in the extending direction, and may be cross-shaped, and two pairs of positioning long grooves 37 are provided. The rotary table 20 is provided with a clamping plate matched with the positioning long groove 37, and correspondingly, the clamping plate has two pairs, including: a pair of main clamping plates 15 and a pair of auxiliary clamping plates 17, wherein the pair of main clamping plates 15 are oppositely arranged, and the pair of auxiliary clamping plates 17 are oppositely arranged. The main clamping plate 15 and the auxiliary clamping plate 17 are made of insulating materials, and the main clamping plate 15 and the auxiliary clamping plate 17 are connected with the positioning long groove 37 through clamping plate positioning bolts 38. In this embodiment, the clamping plate has a hole matching with the clamping plate positioning bolt 38, the positioning of the clamping plate uses the positioning long groove 37, the clamping plate positioning bolt 38 and the positioning long groove 37 are matched and clamped with each other, and when the position of the clamping plate needs to be adjusted, the position of the clamping plate on the positioning long groove 37 is adjusted by loosening the nut matching with the clamping plate positioning bolt 38. The embodiment of the application can adjust the position of the clamping plate according to the size of the rock 16 by arranging the rock clamping mechanism on the rotary table surface 20, and the rock 16 is kept clamped. Therefore, when the rock 16 rotates on the rotary table 20, the rock 16 is always kept at the center of the rotary table 20 and is not thrown out by the auxiliary clamping of the main clamping plate 15 and the auxiliary clamping plate 17.

Preferably, the clamping face that laminates mutually with rock 16 on the main grip block 15 has the recess of circular arc type, realizes including the stable centre gripping for the shape is cylindrical, cube, cuboid rock specimen.

The liquid phase discharge generating mechanism is positioned by the electrode mounting device. The electrode mounting apparatus includes an electrode positioning post 24 and an electrode horizontal positioning mechanism 100. In the experiment process, a pair of electrodes 13 with a certain shape can be selected and positioned on the electrode positioning column 24, and the electrode horizontal positioning mechanism 100 is used for adjusting the size of the gap between the pair of electrodes 13 and can be used for researching the influence of the distance between the electrodes 13 on the pressure of the shock wave. Specifically, the electrode positioning column 24 includes: the first electrode positioning column and the second electrode positioning column are respectively used for positioning the first electrode and the second electrode, so that the first electrode and the second electrode are adjusted to be at the same height, and the gap between the first electrode and the second electrode can be adjusted through the electrode horizontal positioning mechanism 100.

In this specification, as shown in fig. 2 and 4, the electrode horizontal positioning mechanism 100 includes: the slide block 23 is connected with the electrode 13 through an electrode rod; the electrode positioning column 24 is provided with a mounting hole 30 for accommodating the slider 23, the slider 23 is movable relative to the mounting hole 30, the outer contour dimension of the slider 23 is larger than the dimension of the mounting hole 30, and a plurality of mounting holes 30 are arranged along the height direction of the electrode positioning column 24.

In correspondence with the electrode positioning column 24, the electrode horizontal positioning mechanism 100 includes: the first electrode horizontal positioning mechanism and the second electrode horizontal positioning mechanism. The first electrode horizontal positioning mechanism is used for adjusting the horizontal position of the first electrode, and the second electrode horizontal positioning mechanism is used for adjusting the horizontal position of the second electrode. The electrode positioning column 24 and the slider 23 are made of insulating materials. The slider 23 is connected to the electrode 13 via an electrode rod which can be positioned in a bore of the slider 23 via an electrode rod positioning nut 29. One end of the pulse transmission line is connected with a pulse power supply device, and the other end of the pulse transmission line can be connected with an electrode rod through an electrode rod positioning nut 29 to provide pulse voltage for the electrode 13. The pulse transmission line may be low impedance and surrounded by a high voltage withstand insulation material. The electrode rod is made of conductive material and can be made of stainless steel, and in the embodiment, the electrode rod can be a straight electrode rod 10. The electrode positioning post 24 is provided with at least one mounting hole 30 along the height direction thereof, the mounting hole 30 is used for accommodating the slider 23, the slider 23 can horizontally move relative to the mounting hole 30, so that the horizontal position of the electrode 13 can be adjusted, and the gap between the pair of electrodes 13 can be adjusted. The size of the outer contour of the sliding block 23 is larger than that of the mounting hole 30, so that the electrode 13 can be stably positioned when the horizontal position of the electrode 13 is adjusted through the mounting hole 30.

In this embodiment, a plurality of mounting holes 30 are provided along the height direction of the electrode positioning column 24, and by positioning the slider 23 in the mounting holes 30 at different height positions, height adjustment of the slider 23 in the mounting holes 30 in the vertical direction of the fixed table 25 can be achieved, so as to adjust the positioning height of the electrode 13. Further, the electrode horizontal positioning mechanism further comprises: the slider positioning bolt 28 is inserted into the electrode positioning column 24 through the slider positioning bolt 28 when the slider 23 is mounted in one mounting hole 30 on the electrode positioning column 24 according to the designed distance between the electrode 13 and the rock 16, so that the slider 23 can be positioned, and the electrode 13 is adjusted to the horizontal position.

In this specification, an electrode vertical positioning mechanism is disposed between the discharge base 31 and the electrode positioning column 24, and the electrode vertical positioning mechanism is used for adjusting the height of the electrode positioning column 24 relative to the fixed table 25.

Specifically, the electrode positioning column 24 may be fixed on the discharge base 31 by an electrode vertical positioning mechanism. The electrode vertical positioning mechanism specifically comprises: a vertical positioning groove 32 arranged at the bottom of the electrode positioning column 24, wherein the vertical positioning groove 32 can penetrate through the discharging base 31; and a fastening bolt matched with the vertical positioning groove 32, wherein the fastening bolt can fix the electrode positioning column 24 and the discharge base 31 through the vertical positioning groove 32.

In some embodiments, the vertical positioning slot 32 extends longitudinally along the height direction of the discharge base 31, so that the fastening bolt can be positioned along the extending direction of the vertical positioning slot 32, thereby adjusting the height of the electrode positioning column 24 relative to the fixing table 25. In the present embodiment, the height of the electrode 13 can be finely adjusted by the vertical positioning slot 32 at the bottom of the electrode positioning column 24, and the height of the electrode 13 can be roughly adjusted by changing the mounting hole 30 corresponding to the sliding block 23 if necessary, and it is ensured that the two electrodes 13 are coaxial, i.e. the first electrode and the second electrode are at the same height. The horizontal position of the electrode 13 is changed by changing the position of the sliding block 23 in the mounting hole 30, so that the influence of different electrode distances on the shock pressure wave can be studied. Preferably, the midpoint of the gap between the two electrodes 13, i.e., the center of discharge, is located at the center of the stationary table 25.

The sensor mounting device includes a pressure sensor 18 and a sensor positioning mechanism 101. The pressure sensor 18 is electrically connected with the oscilloscope 5, so that the change curve of the shock wave pressure along with the time can be obtained. The sensor positioning mechanism 101 is used to adjust the horizontal spacing of the pressure sensors 18 with respect to the center of the discharge. The time variation curves of the shock wave pressure at different positions from the discharge center can be obtained through the cooperation of the pressure sensor 18 and the sensor positioning mechanism 101.

In the present specification, a tone signal instrument 6 may be connected between the pressure sensor 18 and the oscilloscope 5. The tone signalling device 6 is located remotely from the housing 7. The signal modulation instrument 6 is used for modulating the signal transmitted by the pressure sensor 18 and converting the signal into a signal which can be read by the oscilloscope 5. The oscilloscope 5 is connected with the signal adjusting instrument 6, can read the change curve of the shock wave during discharging and has enough precision.

In the present specification, the pressure sensor 18 is disposed in a liquid phase environment for detecting a shock wave pressure generated by a liquid phase discharge. The pressure sensor 18 is in particular a subsea explosion pressure sensor which can measure at pulsed high pressure. For measuring the shock pressure waves at different positions of the pressure sensor 18 with respect to the center of the discharge, the pressure sensor 18 is connected to a sensor positioning means 101.

In a first embodiment of the present application, please refer to fig. 1 and 5, the sensor positioning mechanism 101 includes: a sensor mount 34; a first positioning rod 36, one end of the first positioning rod 36 is connected with the discharge base 31, the other end is connected with the sensor base 34, and the horizontal distance between the pressure sensor 18 and the discharge center can be adjusted through the first positioning rod 36; one end of the second positioning rod 19 is connected with the discharge base 31, the other end of the second positioning rod 19 is fixed with the pressure sensor 18, and the pressure sensor 18 can adjust the height relative to the fixed table surface 25 through the second positioning rod 19.

The first positioning rod 36 is used to adjust the horizontal spacing of the pressure sensor 18 with respect to the center of discharge. The first positioning rod 36 is a horizontal rod having two opposite ends in the horizontal direction, one end of which can be fixed on the discharge base 31 through the positioning mounting plate 33, and the other end of which is connected to the sensor base 34. Specifically, the sensor base 34 is provided with a first through hole for connecting the first positioning rod 36, and the first through hole on the sensor base 34 can adjust the distance between the sensor base 34 and the fixed table 25 when moving along the first positioning rod 36. The second positioning rod 19 is used to adjust the height of the pressure sensor 18 relative to the stationary table top 25. The second positioning rod 19 may specifically be a bending rod having a horizontal section and a vertical section, wherein the vertical section of the second positioning rod 19 is connected to the sensor base 34, a second through hole for connecting the second positioning rod 19 is provided on the sensor base 34, and the second through hole can adjust the height between the pressure sensor 18 and the fixed table 25 when moving along the second positioning rod 19, so as to adapt to the positions of the electrodes 13 with different heights. The horizontal section and the vertical section of second locating lever 19 can be mutually perpendicular, and vertical section is connected to the one end of horizontal section, and pressure sensor 18 is connected to the other end of horizontal section. The pressure sensor 18 can adjust the distance from the discharge center by adjusting the engagement between the first positioning rod 36 and the second positioning rod 19.

In this embodiment, the sensor positioning mechanism 101 further includes a sensor positioning rod positioning bolt 35, and after the position of the pressure sensor 18 is adjusted by the first positioning rod 36 and the second positioning rod 19, the first positioning rod 36 and the second positioning rod 19 can be fixed by the sensor positioning rod positioning bolt 35.

In a first embodiment of the present application, as shown in fig. 5 and 6, the experimental system includes a flow rate simulation apparatus including: the guide support 11 is assembled on the electrode positioning column 24, the guide support 11 is provided with at least one guide hole 12, and the guide hole 12 extends towards the gravity direction, or the guide hole 12 extends towards the direction perpendicular to the gravity direction; the water outlet 3 of the water pump 2 is communicated with at least one flow guide hole 12, and the water inlet 4 of the water pump 2 is communicated with the box body 7; and the second control unit 1 is used for controlling the flow rate of the water pump 2.

In this embodiment, the guide bracket 11 is assembled on the electrode positioning post 24, and in order to better stabilize the guide bracket 11, the guide bracket 11 may be provided with an assembling hole matched with the electrode positioning post 24, so that the guide bracket 11 can be assembled on the electrode positioning post 24. When the guide support 11 is assembled on the electrode positioning column 24 through the assembling hole, the guide support is abutted against the sliding block 23 positioned outside the mounting hole 30 on the electrode positioning column 24, and the sliding block 23 can support the guide support 11, so that the overall stability of the device is maintained. Because the first electrode and the second electrode in the electrode 13 pair need to be located at the same height, and the sliding blocks 23 in the first electrode positioning column and the second electrode positioning column are located in the mounting holes 30 at the same height, through the arrangement, the diversion bracket 11 can be simultaneously supported by the sliding blocks 23 in the first electrode positioning column and the second electrode positioning column, so that the diversion bracket 11 is favorably positioned, and the horizontal state of the diversion bracket 11 can be kept.

In this embodiment, a plurality of diversion holes 12 are provided on the diversion bracket 11, the diversion holes 12 may be provided in plural, each diversion hole 12 may have a different orientation, and the diversion holes 12 with different orientations correspond to different flow environments, so as to simulate the local flow condition of the drilling fluid between the drill bit end electrode 13 and the rock 16 in the actual production operation. Because the relative positions of the electrode 13, the drill hole and the downhole rock are different, the local flow direction between the electrode 13 and the downhole rock drilling fluid is changed, so that the influence factors of different flow directions on the discharge of the electrode 13 need to be researched. As shown in fig. 6, the guiding holes 12 may extend toward the gravity direction and have vertical guiding holes 39, so that the water flow passing through the guiding holes 12 can be used to simulate the flow condition in the vertical direction to the rock; the deflector holes 12 may also extend in a direction perpendicular to the direction of gravity, with the deflector holes 40 oriented horizontally, so that the flow of water through the deflector holes 12 may be used to simulate a flow parallel to the direction of the rock.

In the present embodiment, at least one diversion hole 12 is communicated with the water outlet 3 of the water pump 2. The second control unit 1 is used to control the flow rate of the water pump 2. The second control unit 1 is specifically a flow rate control panel, and is placed outside the tank 7 to control the flow rate of the water outlet 3 of the water pump 2, so that the local flow rate between the electrodes 13 can be controlled. The water inlet 4 of the water pump 2 is communicated with the box body 7, so that the water level in the box body 7 can be stabilized. In some specific embodiments, the water inlet 4 of the water pump 2 is placed at a corner of the glass box 7 far away from the electrode 13 through a connecting rubber tube, so that the influence of the imbibition process of the water inlet 4 on the flow rate of the outlet water is reduced as much as possible, and meanwhile, the electrode 13 is prevented from being influenced by the obvious change of the water surface position of the box 7 caused by the injection of a liquid medium in the box 7, and the experimental error is reduced.

In this specification, a rock evaluation device may be further included, the rock evaluation device including: and the acoustic wave emission instrument, the longitudinal wave probe and the oscilloscope 5 are used for detecting the damage degree of the liquid phase discharge shock wave to the rock 16. The transmitting end of the longitudinal wave probe is electrically connected with the sound wave transmitter, and the receiving end of the longitudinal wave probe is connected with the oscilloscope 5.

In the first embodiment provided in the present application, the tank 7 may be used to provide the entire liquid phase environment of the liquid phase discharge. The discharge base 31, the rotating means, the liquid-phase discharge generating mechanism, the electrode mounting means, and the sensor mounting means may all be located in a liquid-phase environment. The liquid-phase discharge impact rock breaking experimental system in the first embodiment of the application can be used for researching the influence rule of pulse voltage parameters, the distance between the electrodes 13, the shape of the electrodes 13, the relative rotation speed between the rock 16 and the electrodes 13, the local flow velocity between the electrodes 13 and the flow condition between the electrodes 13 and the rock 16 on the shock wave pressure generated by the electrode discharge. The relative position of the pressure sensor 18 and the discharge center can be adjusted by the sensor positioning mechanism 101 so as to obtain the shock wave intensity and the shock wave waveform of the pressure sensor 18 from different discharge center positions. The rock 16 can be evaluated by a rock evaluation device to obtain damage data of the liquid phase pulse discharge shock wave to the rock 16.

For a better understanding of the first embodiment of the present application, the specific experimental procedures provided in the present specification may be as follows:

a) maintenance and evaluation of the rock 16.

The rock 16 to be experimentally studied is maintained in the liquid medium used at the discharge for a predetermined number of days or more. The method comprises the steps of detecting damage initial data of the rock by adopting an ultrasonic penetration method, connecting a transmitting end of a longitudinal wave probe in a rock evaluation device with an acoustic wave transmitter, connecting a receiving end of the longitudinal wave probe with an oscilloscope 5, attaching two probes with one pair of opposite surfaces of the rock 16, smearing a coupling agent in the middle, and reading a voltage peak on the oscilloscope 5 as a rock damage evaluation initial value.

b) An electrode mounting means is provided and connected to a pulse power supply means 27.

The straight electrode rod 10 is fixed in the bore of the slide 23 by an electrode rod positioning nut 29. According to the designed distance between the electrode 13 and the rock 16, the sliding block 23 is inserted into one of the mounting holes 30 on the electrode positioning column 24, then the horizontal position of the adjusted straight electrode rod 10 is fixed through the sliding block positioning bolt 28, and the pulse transmission line of the pulse power supply device 27 is connected with the straight electrode rod 10 through the electrode rod positioning nut 29.

c) A sensor mounting device is provided.

The positioning plate 33 and the discharge base 31 are fixed, the first positioning rod 36 and the positioning plate 33 are fixed, the first positioning rod 36 is inserted into the first through hole of the sensor base 34, and then the sensor positioning rod is fixed by the sensor positioning rod positioning bolt 35. The second positioning rod 19 is inserted into the hole of the sensor base 34, and the pressure sensor 18 is fixed at the end part of the second positioning rod 19, wherein the sensing element of the pressure sensor 18 is opposite to the middle part of the fixed table surface 25.

d) Clamping the rock 16.

The rock 16 is placed in the middle of the rotary table surface 20, the clamping plate positioning bolt 38 is tightened to enable the rock 16 to be clamped by the main clamping plate 15, and the auxiliary clamping plate 17 is used for assisting in fixing the rock 16, so that the rock 16 is located in the center of the rotary table surface 20.

e) The electrode 13 is selected and the position of the electrode 13 is adjusted.

A pair of electrodes 13 with a certain shape is selected, the electrodes 13 are installed on a straight electrode rod 10, the vertical position of the electrodes 13 is finely adjusted through a vertical positioning groove 32 at the bottom of an electrode positioning column 24, the position of the electrodes 13 is roughly adjusted through changing an installation hole 30 where a sliding block 23 is located when necessary, and finally, the two electrodes 13 are ensured to be coaxial. The horizontal position of the electrode 13 is changed by changing the position of the slider 23 in the mounting hole 30, and the center of the discharge is ensured to be positioned at the center of the fixed table 25.

f) Assembly of the device in the case 7.

The tank 7 is first filled with a certain amount of liquid medium by the water pump 2 and the assembled device is placed in the tank 7. The hydraulic motor is arranged between the discharge bases 31, below the stationary table 25. The coupling 22 connected with the hydraulic motor is aligned with the assembly hole of the fixed table 25, the rotary table 20 is placed on the fixed table 25, and the bolt at the bottom of the rotary table 20 is screwed with the coupling 22 by rotating the rotary table 20. The guide bracket 11 is assembled on the two electrode positioning columns 24, and the guide bracket 11 is supported by the edge of the sliding block 23 outside the mounting hole 30. According to the design flow velocity direction, the water pump 2 is placed outside the box body 7, the water outlet 3 of the water pump 2 is connected with the vertical direction diversion hole 39 or the horizontal direction diversion hole 40 on the diversion bracket 11, and the end part of the rubber tube connected with the water inlet 4 of the water pump 2 is placed in the box body 7 and away from the position of the electrode.

g) Cover the cover of the box 7 and keep away from the experimental system.

The box cover is covered on the box body 7, so that the liquid medium is prevented from splashing everywhere during the liquid phase pulse discharge; the experimental phenomenon is observed through a transparent glass box body 7 far away from the experimental system.

h) And (4) arranging a rotating device.

The pump station 8 is controlled by the first control unit 9 to transmit hydraulic power to the hydraulic motor to rotate the rotary table 20, in particular, the pump station 8 is not started when the rotation speed of the design rock 16 is 0.

i) And setting a flow velocity simulation device.

The control of the water pump 2 by the second control unit 1 provides a flow rate condition parallel to the surface of the rock 16 or perpendicular to the surface of the rock 16 for the local position between the electrodes 13.

j) Shock wave pressure measurement setup.

And opening the tone signaling instrument 6 and the oscilloscope 5, setting the acquisition mode of the oscilloscope 5 as peak detection, setting the trigger mode as slope-rising, and pressing down a single time to start acquisition after adjusting a proper trigger level.

k) And (5) setting a pulse power supply device.

And (3) turning on the pulse power supply device 27, transmitting pulse voltage to the electrodes 13 through the pulse transmission line and the straight electrode rod 10, discharging liquid medium between the electrodes, and obtaining a change curve of the shock wave pressure along with time in the oscilloscope 5, pulse voltage parameter characteristics (including voltage and current wave forms during discharging) recorded by the pulse power supply device 27 and the rock 16 impacted by the liquid phase pulse discharging shock wave.

l) closing and arranging the equipment.

And (3) closing the pulse power supply device 27, the flow velocity simulation device and the rotating device in sequence, storing and naming the data of the oscilloscope 5, taking down the box cover of the box body 7, taking out the guide support 11, removing the rotating table top 20 in sequence according to the installation sequence, and taking out the devices in the box body 7.

m) rock damage evaluation.

After the rock 16 is removed from the rotary table 20, the liquid medium on the surface of the rock is wiped dry and the damage data of the rock is inspected by the same ultrasonic penetration method as in a).

In the experiment system for breaking rock by liquid phase discharge shock wave provided in the second embodiment of the present application, as shown in fig. 7 and 8, a medium reaction barrel 43 is disposed on the fixed table 25, a containing chamber is disposed inside the medium reaction barrel 43, and the liquid phase discharge generating mechanism and the sensor mounting device are located in the containing chamber; the medium reaction barrel 43 includes: the electrode comprises a bottom wall, a side wall and a barrel cover for sealing the accommodating cavity, wherein the rock 16 is positioned on the bottom wall of the medium reaction barrel 43, the side wall of the medium reaction barrel 43 is provided with a groove 45 matched with the sliding block 23, and the electrode 13 can be arranged in the accommodating cavity through the groove.

The main difference between the second embodiment of the present application and the first embodiment of the present application is that the medium reaction barrel 43 is disposed on the fixed table 25. This medium reaction bucket 43 is insulating material, and this medium reaction bucket 43 is used for holding special liquid medium, can bear the liquid medium that glues thick and be difficult to the clearance, places liquid phase discharge generating mechanism and sensor installation device and carries out the experiment of discharging in medium reaction bucket 43, can save liquid medium's volume and make things convenient for the clearance after the experiment. The medium reaction barrel 43 comprises a bottom wall, a side wall and a barrel cover for sealing the accommodating cavity, the rock 16 is placed on the bottom wall, and the side wall is provided with a groove 45 matched with the sliding block 23 of the electrode mounting device, so that the electrode rod and the electrode 13 can conveniently extend into the accommodating cavity of the medium reaction barrel 43 through the groove 45 to perform a discharge experiment.

Further, a rock positioning bottom plate 46 may be disposed on the bottom wall of the medium reaction barrel 43, and a rock clamping mechanism including a positioning elongated slot 37 and a clamping plate cooperating with the positioning elongated slot 37 may be disposed on the rock positioning bottom plate 46. The structure and the using method of the rock clamping mechanism have been specifically described in the first embodiment of the present application, and are not described herein again.

Furthermore, a groove 45 matched with the slide block 23 is arranged on the side wall of the medium reaction barrel 43, so that the medium reaction barrel 43 is arranged on the fixed table surface 25, and the medium reaction barrel 43 can be positioned through the groove 45. The slide 23 projects the electrode 13 into the receiving chamber via an electrode rod connected thereto. In the second embodiment of the present application, the electrode rod is preferably a bent electrode rod 42. The bent electrode rod 42 can be made of stainless steel material and is fixed in the sliding block 23 through a bolt and an electrode rod positioning nut 29. One end of the bent electrode rod 42 is provided with the electrode 13, and the other end is connected with the pulse transmission line through the electrode rod positioning nut 29. In some embodiments, the curved portion of the bent electrode rod 42 is a full-face weld to avoid an increase in electrical resistance inside the electrode rod. The curved electrode rod 42 extends the electrode 13 to a position deep below the liquid surface of the medium by the curved structure, thereby ensuring stable discharge.

In this embodiment, the sensor positioning mechanism 101 is specifically a plurality of sensor holders 41 disposed in the accommodating chamber, and the plurality of sensor holders 41 respectively correspond to different horizontal positions with respect to the discharge center.

Specifically, the sensor holder 41 may be installed on the bottom wall of the media reaction barrel 43, the sensor holder 41 has a certain height, and the top of the sensor holder 41 has an installation groove matched with the pressure sensor 18, so as to support the pressure sensor 18. The sensor holder 41 has a plurality of sensor holders 41, and the plurality of sensor holders 41 may have different lengths, so that the sensor holder 41 having a suitable height may be selected according to the height of the rock 16 in the discharge experiment. A plurality of the sensor holders 41 are arranged in a direction on the bottom wall of the medium reaction barrel 43 so that each sensor holder 41 corresponds to a different horizontal position with respect to the center of discharge between the pair of electrodes 13, respectively. When it is necessary to measure the shock wave pressure at different distances from the discharge center, the mounting position of the pressure sensor 18 may be changed to be mounted on another sensor holder 41, thereby changing the distance of the pressure sensor 18 with respect to the discharge center. Further, the top edge of the media reaction barrel 43 may also be provided with a sensor wire groove 44, so that it can be used for receiving the connection wires of the pressure sensor 18.

In the second embodiment of the present application, the medium reaction barrel 43 is used to provide the entire liquid phase environment of the liquid phase discharge. The liquid phase discharge generating mechanism and the sensor mounting device are both located in the medium reaction barrel 43. The liquid phase discharge shock wave rock breaking experiment system in the second embodiment of the application can change pulse voltage parameter characteristics, the distance between the electrodes 13, the shape of the electrodes 13 and the type of a liquid medium, can obtain the wave pattern of the shock wave at different positions away from a discharge center through the pressure sensor 18, and can evaluate the rock 16 by utilizing the rock evaluation device to obtain damage data of the liquid phase pulse discharge shock wave to the rock 16.

In a second embodiment of the application, the independent variables include pulse voltage parameter characteristics, electrode 13, type of liquid medium, distance of pressure sensor 18 from the center of the discharge. Compare the first embodiment of this application, can be used for handling special medium, for example the liquid medium that the price is expensive, thick difficult clearance to can overcome waste liquid treatment cost height, be difficult to the problem of clearance experimental apparatus.

For a better understanding of the second embodiment of the present application, the specific experimental procedures provided in the present specification may be as follows:

a) maintenance and evaluation of the rock 16.

The bent electrode rod 42 is placed in the bore of the slide 23 by the electrode rod positioning nut 29. According to the designed distance between the electrode 13 and the rock 16, the sliding block 23 is inserted into one of the mounting holes 30 on the electrode positioning column 24, then the horizontal position of the rear bent electrode rod 42 is fixedly adjusted through the sliding block positioning bolt 28, and the pulse transmission line of the pulse power supply device 27 is connected with the bent electrode rod 42 through the electrode rod positioning nut 29.

c) Installation device for setting sensor

The sensor bracket 41 with the proper height is selected according to the height of the rock 16, the pressure sensor 18 is fixed on one of the sensor brackets 41, and the sensing element of the pressure sensor is opposite to the middle part of the rock positioning bottom plate 46.

d) Clamping the rock 16.

The rock 16 is placed in the middle of the rock positioning bottom plate 46 and the primary clamping plate 15 is used to clamp the rock 16 and ensure that the rock 16 is located in the centre of the rock positioning bottom plate 46.

e) Mounting of media reaction barrel 43

The rock positioning bottom plate 46 is placed on the bottom surface of the medium reaction barrel 43, and then the medium reaction barrel 43 is placed on the fixed table 25 and clamped between the electrode positioning columns 24, so that the groove 45 on the medium reaction barrel 43 is aligned with the slide block 23. The connections for the pressure sensor 18 are placed in a sensor lead slot 44 on the media reaction barrel 43. The electrode positioning column 24 is lifted to the highest position by the vertical positioning groove 32 and the slider 23 is inserted into the mounting hole 30 of the highest position of the electrode positioning column 24, and then the horizontal position of the electrode 13 is adjusted by the slider positioning bolt 28.

f) The electrode 13 is selected and the position of the electrode 13 is adjusted.

A pair of electrodes 13 with certain shapes are selected, and the electrodes 13 are installed on the bent electrode rod 42, so that the two electrodes 13 are ensured to be coaxial. The horizontal position of the electrode 13 is changed by changing the position of the slider 23 in the mounting hole 30, ensuring that the center of the discharge is located at the center of the rock positioning bottom plate 46.

g) Assembly of the device in the case 7.

The assembled device is placed in the box 7, and the liquid medium used is introduced into the medium reaction tank 43. And the lid of the medium reaction barrel 43 is covered, thus preventing the liquid medium from splashing during the liquid phase pulse discharge.

h) Cover the cover of the box 7 and keep away from the experimental equipment.

The box cover is covered on the box body 7, so that the liquid medium is prevented from splashing everywhere during the liquid phase pulse discharge; and the experiment phenomenon is observed through the transparent glass box body 7 far away from the experiment platform.

i) Shock wave pressure measurement setup.

j) And (5) setting a pulse power supply device.

The pulse power supply device 27 is turned on, the pulse voltage is transmitted to the electrodes 13 through the pulse transmission line and the bent electrode rod 42, the liquid medium is discharged between the electrodes, and the change curve of the shock wave pressure along with time in the oscilloscope 5, the pulse voltage parameter characteristics (including voltage and current wave forms during discharging) recorded by the pulse power supply device 27 and the rock 16 impacted by the liquid phase pulse discharging shock wave are obtained.

k) And (5) closing and arranging equipment.

And (3) closing the pulse power supply device 27, storing and naming the data of the oscilloscope 5, opening the barrel cover of the medium reaction barrel 43, replacing the sensor bracket 41 where the pressure sensor 18 is positioned, further changing the position of the pressure sensor 18 relative to the discharging center, and simultaneously replacing the rock 16. Since the medium reaction barrel 43 is fixed by the slide block 23, the slide block 23 is firstly taken out from the mounting hole 30 at the highest position of the electrode positioning column 24, and then the medium reaction barrel 43 can be taken out from the fixing table 25 separately.

l) rock damage evaluation.

After the rock 16 is taken out from the medium reaction barrel 43, the liquid medium on the surface of the rock is wiped dry, and the damage data of the rock is detected by the ultrasonic penetration method which is the same as that in the step a).

The application also provides a broken rock experimental system of liquid phase discharge shock wave, the experimental system includes: a pulse power supply device 27 for supplying a pulse voltage; a discharge base 31, said discharge base 31 comprising a fixed table 25; a liquid phase discharge generating mechanism comprising: a pair of electrodes 13 electrically connected to the pulse power supply device 27, the pair of electrodes 13 comprising: two electrodes 13 which are positioned at the same height relative to the fixed table top 25, wherein a gap is formed between the two electrodes 13, the midpoint of the gap is a discharge center, and the discharge center is positioned right above the rock 16; an electrode mounting device comprising: an electrode positioning post 24, the electrode positioning post 24 being used for positioning the electrode 13; an electrode horizontal positioning mechanism 100 for adjusting the size of the gap; a sensor mounting device comprising: the pressure sensor 18, the said pressure sensor 18 electrical behavior connects oscilloscope 5; a sensor positioning mechanism 101 for adjusting a horizontal interval of the pressure sensor 18 with respect to the discharge center; a medium reaction barrel 43 positioned on the fixed platform 25, wherein the medium reaction barrel 43 is internally provided with a containing chamber for bearing liquid medium, and the rock 16, the liquid-phase discharge generating mechanism and the sensor mounting device are positioned in the containing chamber.

In the present embodiment, the dielectric reaction tank 43 is used to provide the entire liquid phase environment for the liquid phase discharge. The liquid phase discharge generating mechanism and the sensor mounting device are both located in the medium reaction barrel 43. The liquid-phase discharge shock wave rock breaking experiment system in the second embodiment of the application can change pulse voltage parameter characteristics, the distance between the electrodes 13, the shape of the electrodes 13 and the type of the liquid medium, and can obtain the wave patterns of the shock waves at different positions from the discharge center through the pressure sensor 18.

The above embodiments are merely illustrative of the technical concepts and features of the present application, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the present application should be covered in the protection scope of the present application. It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes.

Claims

1. The utility model provides a broken rock experimental system of liquid phase discharge shock wave which characterized in that, the experimental system includes: the pulse power supply device comprises a box body, a pulse power supply device for providing pulse voltage, and a pulse power supply device arranged in the box body, wherein:

the discharge base is of a hollow structure and comprises a fixed table top;

2. The liquid phase discharge shock wave rock breaking experimental system of claim 1, wherein an electrode vertical positioning mechanism is arranged between the discharge base and the electrode positioning column, and the electrode vertical positioning mechanism is used for adjusting the height of the electrode positioning column.

3. The liquid phase discharge shock wave rock breaking experimental system of claim 1, wherein the electrode horizontal positioning mechanism comprises: the sliding block is connected with the electrode through an electrode rod; the electrode positioning column is provided with a plurality of mounting holes used for accommodating the sliding block, the sliding block can move relative to the mounting holes, the size of the outer contour of the sliding block is larger than that of the mounting holes, and the mounting holes are arranged along the height direction of the electrode positioning column.

4. The liquid phase discharge shock wave rock breaking experimental system of claim 3, wherein the experimental system comprises a flow velocity simulation device, and the flow velocity simulation device comprises:

5. The liquid phase electric discharge shock wave rock breaking experimental system of claim 1, wherein the rotating device further comprises a rock clamping mechanism for stabilizing the rock, the rock clamping mechanism comprising: two pairs of oppositely arranged positioning long grooves arranged on the rotary table top; the clamping plate is arranged on the rotary table top and matched with the positioning long groove, the clamping plate can be positioned in the extending direction of the positioning long groove, and the clamping plate and the positioning long groove are fixed through a fastener.

6. The liquid phase discharge shock wave rock breaking experimental system of claim 1, wherein the sensor positioning mechanism comprises:

a sensor base;

7. The liquid phase electric discharge shock wave rock breaking experimental system as claimed in claim 1, wherein the experimental system further comprises a rock evaluation device for detecting a damage degree of the liquid phase electric discharge shock wave to the rock, the rock evaluation device comprises: the device comprises an acoustic wave emission instrument, a longitudinal wave probe and the oscilloscope, wherein the emission end of the longitudinal wave probe is electrically connected with the acoustic wave emission instrument, and the receiving end of the longitudinal wave probe is connected with the oscilloscope.

8. The utility model provides a broken rock experimental system of liquid phase discharge shock wave which characterized in that, the experimental system includes:

a pulse power supply device for supplying a pulse voltage;

a discharge base including a fixed mesa;

9. The liquid phase discharge shock wave rock breaking experimental system of claim 8, wherein the electrode horizontal positioning mechanism comprises: the sliding block is connected with the electrode through an electrode rod; the mounting hole is formed in the electrode positioning column and used for accommodating the sliding block, the sliding block can move relative to the mounting hole, and the size of the outer contour of the sliding block is larger than that of the mounting hole; the side wall of the medium reaction barrel is provided with a groove matched with the sliding block, and the electrode rod can place the electrode in the accommodating cavity of the medium reaction barrel through the groove.

10. The liquid phase discharge shock wave rock breaking experimental system according to claim 8, wherein the sensor positioning mechanism is embodied as a plurality of sensor holders disposed in the accommodating chamber, and the plurality of sensor holders respectively correspond to different horizontal positions with respect to the discharge center.