A device and method for increasing the filling of a subsidence column by using electric pulses and water pulses at the same frequency

Abstract

The present invention belongs to the technical field of grouting and filling of collapsed columns, and is specifically a device and method for increasing the filling of collapsed columns by electric pulses and water pulses at the same frequency. It includes a capacitor discharge positive electrode and a capacitor discharge negative electrode arranged in a borehole, the borehole outlet is blocked by a cement blocking block, a pressure balance channel, a pressure-maintaining tube, a pulse injection tube, a capacitor positive electrode connector and a capacitor negative electrode connector are buried in the cement blocking block, a one-way valve is fixed on the outer end of the pressure balance channel and the pulse injection tube, a liquid pressure sensor is installed on the left side of the outer end of the pressure balance channel, and a valve is installed on the right side thereof, the outer end of the pressure-maintaining tube is connected to the injection port of the pressure-maintaining pump through a high-pressure tube, the outer end of the pulse injection tube is connected to the pulse pump through a high-pressure tube, the pressure-maintaining pump and the pulse pump are both connected to a flow meter, the flow meter is connected to a filling material pool through a suction tube, the capacitor positive electrode connector is connected to the capacitor discharge positive electrode, the capacitor negative electrode connector is connected to the capacitor discharge negative electrode, and the capacitor positive electrode connector and the capacitor negative electrode connector are connected to a capacitor charging device.

Description

Technical Field

[0001] The invention belongs to the technical field of grouting filling of collapsed columns, and in particular is a device and method for filling collapsed columns with electric pulses and water pulses at the same frequency. Background Art

[0002] At present, electric pulses are mainly used for coal body permeability enhancement in the coal field and for clearing blockages in oil pumping pipes in the oil field.

[0003] At present, electric pulses are mainly used in the coal field to increase the permeability of coal bodies. The operation method is that high-voltage electric pulses use high-voltage energy storage capacitors to discharge water gaps in the electrodes through the discharge electrodes, thereby generating a strong pulse pressure effect. At the same time, a periodic pulse pressure wave is formed through the charge-discharge cycle process to act on the reservoir, causing cracks in the reservoir and improving the permeability of the reservoir. The high-voltage electric pulse mainly relies on the huge stress wave released instantly by the discharge electrode and the high-pressure water entering the coal body cracks to expand the cracks. The advantage of this method is that it has a significant permeability increase effect in the drilling of soft coal seams supported by screen pipes, and has a significant promoting effect on the generation of coal body fracture networks. After the action, the coal body breaks and other phenomena occur, and new cracks and pores are generated, so that the fracture network penetration effect is better, and it has no effect on the composition of the coal body. With the increase in the number of times the liquid-electric effect acts, the density of cracks on the coal surface increases. The disadvantage is that in the open-hole drilling of harder and less permeable coal seams, the uncertainty of the impact density and the influence range of the permeability increase measures increases. Electric pulse discharges in an environment filled with conductive liquid in the coal borehole. During the expansion and cracking of the borehole wall, water will enter the coal body, causing a water seal of gas, which is not conducive to gas release. When gas extraction is carried out, the water in the hole needs to be pumped out before further gas extraction.

[0004] Electric pulses are mainly used in the field of petroleum to clear blockages in oil pumping pipes. The operation method is to discharge high voltage in the downhole liquid to cause a pressure pulse that propagates in a directional manner, selectively treat the oil layer or thin layer with poor water injection, so as to achieve the purpose of increasing crude oil production, reducing water content and increasing water well injection. Its physical essence is that high pressure breaks down the local medium that fills the well, and quickly releases a large amount of energy in a small channel. The advantage of this method is that at the moment of discharge, a high-intensity low-frequency pulse wave and a strong electromagnetic field are instantly excited in the liquid in the well. Since the low-frequency pulse vibration wave has low attenuation in the formation and strong penetration ability, it acts on the oil layer to produce micro-cracks in the oil layer, remove oil layer pollution and blockage, and improve the permeability of the production layer. The disadvantage is that the electric pulse discharges in the environment of crude oil, breaking the stones blocking the pipe mouth in the hole. Since the discharge is carried out in a negative pressure environment, the broken stones are immediately pumped into the pumping pipe, which may cause secondary blockage. At the same time, the oil pumping pipe is generally more than one kilometer, which will cause the pulse discharge device to have a large resistance and a long wire, which is not conducive to pulse discharge.

[0005] The grouting filling of collapsed columns in the coal field is a new field of application of electric pulses. Electric pulses are more suitable for filling collapsed columns because the purpose of grouting is to fully infiltrate the slurry into the collapsed columns. The wall of the collapsed column borehole will crack at the moment of the pulse, and the slurry can fully enter the cracks due to the liquid pulse pressure, thus achieving a better filling effect.

[0006] The conventional method of filling a collapse column is to inject the filling material into the collapse area through a borehole under high pressure, forming support for the overlying rock strata of the collapse space, thereby slowing down the transfer of the mining space to the surface and controlling the collapse of the surface. The problems of the conventional filling method are: ① The slurry cannot fully penetrate into the collapse column, and there is a blank area in the middle of the borehole. ② The grouting time is long, and static pressure maintenance time is required for a long time. ③ Static pressure only penetrates the slurry into the collapse column, and cannot fracture the borehole wall, resulting in poor grouting effect. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a device and method for increasing the filling of a subsidence column by using electric pulses and water pulses at the same frequency.

[0008] The present invention adopts the following technical scheme: a device for filling a subsidence column by injecting electric pulses and water pulses at the same frequency, comprising a capacitor discharge positive electrode and a capacitor discharge negative electrode arranged in a borehole, the borehole outlet is blocked by a cement blocking block, a pressure balance channel, a pressure maintaining tube, a pulse injection tube, a capacitor positive electrode connector and a capacitor negative electrode connector are buried in the cement blocking block, a one-way valve is fixed on the outer ends of the pressure balance channel and the pulse injection tube, a liquid pressure sensor is installed on the left side of the outer end of the pressure balance channel, and a valve is installed on the right side thereof, the outer end of the pressure maintaining tube is connected to the injection port of a pressure maintaining pump through a high-pressure tube, the outer end of the pulse injection tube is connected to a pulse pump through a high-pressure tube, the pressure maintaining pump and the pulse pump are both connected to a flow meter, the flow meter is connected to a filling material pool through a suction tube, the capacitor positive electrode connector is connected to the capacitor discharge positive electrode, the capacitor negative electrode connector is connected to the capacitor discharge negative electrode, the capacitor positive electrode connector and the capacitor negative electrode connector are connected to a capacitor charging device.

[0009] Furthermore, the capacitor charging device includes a capacitor, the positive pole of the capacitor discharge interface of the capacitor is connected to one pole of the capacitor discharge switch, the other pole of the capacitor discharge switch is connected to the positive pole connector of the capacitor by a wire, the negative pole of the capacitor discharge interface is connected to the negative pole connector of the capacitor, and the capacitor is connected to a capacitor charging power supply.

[0010] Furthermore, a pressure-maintaining pump switch is installed on the power supply line of the pressure-maintaining pump, and the other end of the pressure-maintaining pump switch is connected to the power supply of the pressure-maintaining pump by a wire.

[0011] Furthermore, a pulse pump switch is installed on the pulse pump power supply circuit, and the other end of the pulse pump switch is connected to the pulse pump power supply by a wire.

[0012] A method for filling a collapsed column by using electric pulses and water pulses at the same frequency, comprising the following steps:

[0013] S100~After drilling a hole with a drill rod for mining the coal seam, the drill rod is withdrawn and the positive electrode of the capacitor discharge and the negative electrode of the capacitor discharge are fixed in the borehole.

[0014] S200~The borehole is sealed with a cement sealing block. At the same time, a pressure balance channel, a pressure maintaining tube, a capacitor positive electrode connector and a capacitor negative electrode connector are buried in the cement sealing block. The capacitor positive electrode connector is connected to the capacitor discharge positive electrode, and the capacitor negative electrode connector is connected to the capacitor discharge negative electrode. At the same time, a pulse injection tube is buried in the cement sealing block, and a one-way valve is fixed on the outer end of the pressure balance channel and the pulse injection tube, so that the filling material can only flow into the borehole but not out.

[0015] S300~A liquid pressure sensor is installed on the left side of the outer end of the pressure balance channel, and a valve is installed on the right side of the liquid pressure sensor; the outer end of the pressure maintaining tube is connected to the injection port of the pressure maintaining pump with a high-pressure tube, the feed port of the pressure maintaining pump is connected to the flow meter, the feed end of the flow meter is connected to the suction pipe, and the suction pipe is placed in the filling material pool; the outer end of the pulse filling tube is connected to the pulse pump with a high-pressure tube, the feed port of the pulse pump is connected to the flow meter, the feed end of the flow meter is connected to the suction pipe, and the suction pipe is placed in the filling material pool.

[0016] S400~After the borehole is sealed with cement plugging block, the valve on the pressure balance channel is opened to allow the pressure-maintaining pump to pre-fill the borehole with filling material. When the borehole is filled with filling material and overflows from the pressure balance channel, the valve on the pressure balance channel is closed and the pressure-maintaining pump continues to inject material. At the same time, the flow change of the flow meter and the pressure change of the liquid pressure sensor are observed. After the values ​​of the two are stable, the relationship curve between the relative pressure in the borehole and time is recorded. Curve 1 is the pressure generated by the pressure-maintaining pump on the collapse column.

[0017] S500~While the pressure-maintaining pump continues to maintain pressure in the borehole, the pulse pump is turned on to pressurize the borehole at a frequency f, and the relative pressure-time curve of the pulse pump during pressurization is recorded. Curve 2 is the pressure generated by the pulse pump on the collapse column.

[0018] S600~Electric pulses are generated through the capacitor discharge positive electrode and the capacitor discharge negative electrode in the borehole. The energy released by the electric pulses will cause changes in the pressure inside the liquid. The specific relationship curve 3, that is, the pressure generated by the electric pulses on the collapse column, is recorded.

[0019] S700~After obtaining curves 1-3, it is known from curve 1 that the action function of the pulse pump on the pressure value in the borehole is a periodic function. Through the function graph, we stipulate that: when curve 1 is at the trough, it is measured at t0, and when it reaches the second adjacent trough to the right, it is measured at t1. The period of curve 1 is T0=t1-t0, and the T0 value remains unchanged after stabilization; because the speed of electric pulse generation is relatively fast, it is necessary to obtain the time difference T1 between the closing of the capacitor discharge switch and the generation of the peak in curve 3 according to curve 3. At this time, it is necessary to find the difference between T0 and T1, that is, the best time to close the capacitor discharge switch and generate an electric pulse. The formula for the start time is t=t0+(T0-T1); through the formula t for the start time of the electric pulse, the electric pulse and the water pulse are made to have the same frequency. Under the action of the pressure-maintaining pump of curve 2, the pressure of the pressure-maintaining pump, the pressure of the pulse pump and the pressure of the electric pulse are superimposed, and the specific relationship curve 4 is recorded, that is, the pressure of the pressure-maintaining pump, the pulse pump and the electric pulse are superimposed, which greatly changes the overall pressure in the borehole and achieves the effect of increasing the injection of the subsidence column.

[0020] S800~ can be operated repeatedly according to the actual situation of the collapse column until the collapse column filling reaches the expected effect.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] ① The amplitude and action time of the electric pulse shock wave can be controlled by adjusting the discharge voltage and discharge current, and the amplitude and action time of the liquid pulse shock wave can be controlled by replacing pulse pumps of different powers. In application, the equipment parameters can be changed according to the filling environment of the subsidence column. ② The grouting is sufficient, uniform, efficient and effective. ③ The pulse dynamic load can effectively produce cracks and pores, making the crack network penetration effect better. ④ The number of repeated actions is controllable. Through multiple impacts, the density of cracks on the surface of the coal body increases. ⑤ The operating area is controllable, and the transformation effect on the subsidence area is formed by accurately designing the permeability enhancement filling process parameters. ⑥ Simple operation, fast speed, and no environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 It is a view of curve 1 to curve 3;

[0025] Figure 3 It is a flow chart of the present invention;

[0026] In the figure, 1, drilling, 2, coal seam mining, 3, pressure balance channel, 4, pressure maintaining pipe, 5, pressure maintaining pump, 6, suction pipe, 7, filling material pool, 8, pressure maintaining pump switch, 9, pressure maintaining pump power supply, 10, cement blocking block, 11, capacitor discharge switch, 12, capacitor charging power supply, 13, capacitor charging switch, 14, capacitor charging interface, 15, capacitor, 16, capacitor discharge interface, 17, capacitor positive terminal, 18, capacitor negative terminal, 19, capacitor discharge positive electrode, 20, capacitor discharge negative electrode, 21, one-way valve, 22, pulse pump, 23, pulse pump power supply, 24, pulse pump switch, 25, liquid pressure sensor, 26, flow meter, 27, valve, 28, pulse injection pipe. DETAILED DESCRIPTION

[0027] like Figure 1 As shown, a device for increasing the frequency of electric pulse and water pulse to increase the filling of a subsidence column comprises a capacitor discharge positive electrode 19 and a capacitor discharge negative electrode 20 arranged in a borehole 1, the borehole 1 is blocked by a cement blocking block 10, a pressure balance channel 3, a pressure maintaining tube 4, a pulse injection tube 28, a capacitor positive electrode connector 17 and a capacitor negative electrode connector 18 are buried in the cement blocking block 10, a one-way valve is fixed on the outer ends of the pressure balance channel 3 and the pulse injection tube 28, a liquid pressure sensor 25 is installed on the outer end of the pressure balance channel 3 on the left side, and A valve 27 is installed on the right side thereof, the outer end of the pressure maintaining tube 4 is connected to the injection port of the pressure maintaining pump 5 through a high-pressure tube, the outer end of the pulse injection tube 28 is connected to the pulse pump 22 through a high-pressure tube, the pressure maintaining pump 5 and the pulse pump 22 are both connected to the flow meter 26, the flow meter 26 is connected to the filling material pool 7 through the suction tube 6, the capacitor positive electrode connector 17 is connected to the capacitor discharge positive electrode 19, the capacitor negative electrode connector 18 is connected to the capacitor discharge negative electrode 20, the capacitor positive electrode connector 17 and the capacitor negative electrode connector 18 are connected to the capacitor charging device.

[0028] (1) Setting in the borehole. After drilling a hole with a drill rod for coal seam mining, the drill rod is withdrawn. The capacitor discharge positive electrode 19, the capacitor discharge negative electrode 20, and related wires are fixed in the borehole 1. The borehole mouth is sealed with a cement plugging block 10. While sealing, the pressure balance channel 3, the pressure maintaining tube 4, the capacitor positive electrode connector 17, and the capacitor negative electrode connector 18 are buried in the cement plugging block 10. The capacitor positive electrode connector 17 is connected to the capacitor discharge positive electrode 19, and the capacitor negative electrode connector 18 is connected to the capacitor discharge negative electrode 20. At the same time, a pulse injection pipe 28 is buried in the cement plugging block 10, and a one-way valve is fixed on the outer end of the pressure balance channel 3 and the pulse injection pipe 28, so that the filling material can only flow into the borehole but not out.

[0029] (2) Drilling peripheral settings.

[0030] A liquid pressure sensor 25 is installed on the left side of the outer end of the pressure balance channel 3, and a valve 27 is installed on the right side. The pressure sensor can monitor the pressure of the electric pulse and the water pulse, and can be compared with the rock strength inside the sinking column borehole, and the control voltage intensity and liquid pulse intensity can be adjusted according to the actual situation.

[0031] The one-way valve 21 at the outer end of the pressure-maintaining tube 4 is connected to the injection port of the pressure-maintaining pump 5 by a high-pressure tube, and the feed port of the pressure-maintaining pump 5 is connected to the flow meter 26. The feed end of the flow meter 26 is connected to the suction pipe 6, and the suction pipe 6 is placed in the filling material pool 7. The pressure-maintaining pump switch 8 is installed on the power supply line of the pressure-maintaining pump 5, and the other end of 8 is connected to the pressure-maintaining pump power supply 9 by a wire. The one-way valve 21 at the outer end of the pulse injection tube 28 is connected to the pulse pump 22 by a high-pressure tube, and the feed port of the pulse pump 22 is connected to the flow meter 26. The feed end of the flow meter 26 is connected to the suction pipe 6, and the suction pipe 6 is placed in the filling material pool 7. The flow meter can monitor the flow rate of grouting and the instantaneous flow change value of the pulse. When the flow rate gradually decreases, it can be judged that the grouting is completed. The pulse pump switch 24 is installed on the power supply line of the pulse pump 22, and the other end of the pulse pump switch 24 is connected to the pulse pump power supply 23 by a wire.

[0032] The positive electrode of the capacitor charging power supply 12 is connected to the first stage of the capacitor charging switch 13 by a wire, the other stage of 13 is connected to the positive electrode of the capacitor charging interface 14 of the capacitor 15 by a wire, and the negative electrode of the capacitor charging interface 14 is connected to the negative electrode of the capacitor charging power supply 12 by a wire. The positive electrode of the capacitor discharge interface 16 is connected to the first stage of the capacitor discharge switch 11, the other stage of 11 is connected to the capacitor positive terminal 17 by a wire, and the negative electrode of the capacitor discharge interface 16 is connected to the capacitor negative terminal 18.

[0033] (3) Operation steps

[0034] After the borehole 1 is blocked by the cement plugging block 10, the valve 27 on the pressure balance channel 3 is opened, the power supply 9 of the pressure-maintaining pump is turned on, and the switch 8 of the pressure-maintaining pump is closed, so that the pressure-maintaining pump 5 pre-injects the filling material into the borehole. When the filling material in the borehole is filled and overflows from the pressure balance channel 3, the valve 27 on the pressure balance channel 3 is closed, and the pressure-maintaining pump 5 continues to inject the material. At the same time, the flow change of the flow meter 26 and the pressure change of the liquid pressure sensor 25 are observed. After the values ​​of the two are stable, a curve diagram of the relationship between the relative pressure in the borehole and time at this time can be drawn, as shown in FIG. Figure 1 This is shown in "Curve 2: Pressure generated by the pressure-maintaining pump on the collapse column". If the values ​​cannot reach equilibrium for a long time, the power of the pressure-maintaining pump can be increased to improve efficiency.

[0035] While the pressure-maintaining pump 5 continuously maintains the pressure in the borehole, the pulse pump power supply 23 is turned on, and the pulse pump switch 24 is repeatedly turned on and off at a certain frequency f, so that the pulse pump 22 pressurizes the borehole at the same frequency. The relative pressure-time curve when the pulse pump 22 pressurizes is shown in FIG. Figure 1 The frequency f can be controlled by changing the 24 on-off frequency according to the actual situation of the sinking column.

[0036] The capacitor discharge switch 11 is turned off, the capacitor charging power supply 12 is turned on, and the capacitor charging switch 13 is closed to charge the capacitor 15. After the capacitor 15 is fully charged, the capacitor charging power supply 12 is turned off, and the capacitor discharge switch 11 is closed. An electric pulse is instantly generated between the capacitor discharge positive electrode 19 and the capacitor discharge negative electrode 20 in the borehole, releasing a large amount of energy.

[0037] In this method, the capacitor discharges to generate an electric pulse, and the voltage value of the electric pulse during discharge is U, which is generally greater than 10KV. U can be controlled by the rated voltage value of the capacitor charging power supply 12 and the capacitor 15, and the capacity C of the electric pulse, which is generally greater than 10uF. The discharge voltage and discharge current determine the capacity of the electric pulse during discharge, and the calculation formula is E=C*U 2 / 2. The electric pulse discharge voltage, capacity and discharge current are all controllable and can be adjusted and replaced according to actual conditions.

[0038] The energy released by the electric pulse will cause the pressure inside the liquid to change. The specific relationship curve is as follows: Figure 1 As shown in “Curve 3: Pressure of the collapse column caused by the electric pulse”.

[0039] According to "Curve 1", at the peak of the curve, an electric pulse is generated instantly, that is, the peaks of "Curve 3" and "Curve 1" are generated at the same time. Under the action of the pressure-maintaining pump, the pressure of the pressure-maintaining pump, the pressure of the pulse injection pump and the electric pulse pressure are superimposed, such as Figure 2 As shown in "Curve 4: Pressure superposition of pressure-maintaining pump, pulse pump and electric pulse", the overall pressure in the borehole is greatly changed to achieve the effect of increasing the injection of the subsidence column. The operation steps flow chart is as follows Figure 3 shown.

[0040] A method for filling a collapsed column by using electric pulses and water pulses at the same frequency, comprising the following steps:

[0041] S100~After drilling a hole with a drill rod for mining the coal seam, the drill rod is withdrawn, and the capacitor discharge positive electrode 19 and the capacitor discharge negative electrode 20 are fixed in the borehole 1.

[0042] S200~The borehole is sealed with a cement sealing block 10. At the same time, a pressure balance channel 3, a pressure maintaining tube 4, a capacitor positive electrode connector 17 and a capacitor negative electrode connector 18 are buried in the cement sealing block 10. The capacitor positive electrode connector 17 is connected to the capacitor discharge positive electrode 19, and the capacitor negative electrode connector 18 is connected to the capacitor discharge negative electrode 20. At the same time, a pulse injection tube 28 is buried in the cement sealing block 10, and a one-way valve is fixed on the outer end of the pressure balance channel 3 and the pulse injection tube 28, so that the filling material can only flow into the borehole but not out.

[0043] S300~A liquid pressure sensor 25 is installed on the left side of the outer end of the pressure balance channel 3, and a valve 27 is installed on the right side of the liquid pressure sensor 25; the outer end of the pressure maintaining tube 4 is connected to the injection port of the pressure maintaining pump 5 by a high-pressure tube, and the feed port of the pressure maintaining pump 5 is connected to the flow meter 26, and the feed end of the flow meter 26 is connected to the suction pipe 6, and the suction pipe 6 is placed in the filling material pool 7; the outer end of the pulse injection tube 28 is connected to the pulse pump 22 by a high-pressure tube, and the feed port of the pulse pump 22 is connected to the flow meter 26, and the feed end of the flow meter 26 is connected to the suction pipe 6, and the suction pipe 6 is placed in the filling material pool 7.

[0044] S400~After the borehole 1 is sealed with the cement sealing block 10, the valve 27 on the pressure balance channel 3 is opened to allow the pressure-maintaining pump 5 to pre-inject filling material into the borehole. When the filling material in the borehole is filled and overflows from the pressure balance channel 3, the valve 27 on the pressure balance channel 3 is closed, and the pressure-maintaining pump 5 continues to inject material. At the same time, the flow change of the flow meter 26 and the pressure change of the liquid pressure sensor 25 are observed. After the values ​​of the two are stable, the relationship curve between the relative pressure in the borehole and time is recorded at this time. Curve 1 is the pressure generated by the pressure-maintaining pump on the collapse column.

[0045] S500~While the pressure-maintaining pump 5 continues to maintain the pressure in the borehole, the pulse pump 22 is turned on to pressurize the borehole at a frequency f, and the relative pressure-time curve of the pulse pump 22 when pressurizing is recorded. Curve 2 is the pressure generated by the pulse pump on the collapse column.

[0046] S600~An electric pulse is generated through the capacitor discharge positive electrode 19 and the capacitor discharge negative electrode 20 in the borehole. The energy released by the electric pulse will cause a change in the pressure inside the liquid. The specific relationship curve 3, that is, the pressure generated by the electric pulse on the collapse column, is recorded.

[0047] S700~After obtaining curves 1-3, we can know from curve 1 that the pulse pump's action function on the pressure value in the borehole is a periodic function. Through the function graph, we stipulate that when curve 1 is at the trough, t0 is counted (t0 is generally equal to 0), and when it reaches the second adjacent trough to the right, t1 is counted. The period of curve 1 is T0=t1-t0, and the T0 value remains unchanged after stabilization. Because the speed of electric pulse generation is relatively fast, it is necessary to obtain the time difference T1 between the closing of the capacitor discharge switch 11 and the generation of the peak in curve 3 based on curve 3. At this time, it is necessary to find the difference between T0 and T1, which is the best time to close the capacitor discharge switch and generate an electric pulse. The formula for the start time is t=t0+(T0-T1). Through the start-up time formula t of the electric pulse, the electric pulse and the water pulse can be made to have the same frequency. Under the action of the pressure-maintaining pump of curve 2, the pressure of the pressure-maintaining pump, the pressure of the pulse pump and the pressure of the electric pulse are superimposed, and the specific relationship curve 4 is recorded, that is, the pressure superposition of the pressure of the pressure-maintaining pump, the pulse pump and the electric pulse, which greatly changes the overall pressure in the borehole and achieves the effect of increasing the injection of the subsidence column.

[0048] S800~ can be operated repeatedly according to the actual situation of the collapse column until the collapse column filling reaches the expected effect.

Claims

1. A method for increasing the filling of a subsidence column by using electric pulses and water pulses at the same frequency, characterized in that: A device for increasing the frequency of electric pulse and water pulse to fill a subsidence column is used. The device comprises a capacitor discharge positive electrode (19) and a capacitor discharge negative electrode (20) arranged in a borehole (1). The borehole (1) is sealed by a cement plugging block (10). A pressure balance channel (3), a pressure-maintaining tube (4), a pulse injection tube (28), a capacitor positive electrode connector (17) and a capacitor negative electrode connector (18) are buried in the cement plugging block (10). A one-way valve is fixed to the outer ends of the pressure balance channel (3) and the pulse injection tube (28). A liquid pressure sensor (25) is installed on the left side of the outer end of the pressure balance channel (3). A valve (27) is installed on the right side, the outer end of the pressure-maintaining tube (4) is connected to the injection port of the pressure-maintaining pump (5) through a high-pressure tube, the outer end of the pulse injection tube (28) is connected to the pulse pump (22) through a high-pressure tube, the pressure-maintaining pump (5) and the pulse pump (22) are both connected to a flow meter (26), the flow meter (26) is connected to the filling material pool (7) through a suction tube (6), the capacitor positive electrode connector (17) is connected to the capacitor discharge positive electrode (19), the capacitor negative electrode connector (18) is connected to the capacitor discharge negative electrode (20), and the capacitor positive electrode connector (17) and the capacitor negative electrode connector (18) are connected to a capacitor charging device; The pressure generated by the pressure-maintaining pump (5), the pressure generated by the pulse pump (22), and the electric pulse pressure generated by the capacitor negative electrode connector (18) and the capacitor discharge negative electrode (20) are superimposed to change the overall pressure in the borehole, thereby achieving the effect of increasing the injection of the subsidence column; The amplitude and action time of the electric pulse shock wave are controlled by adjusting the discharge voltage and the discharge current, and the amplitude and action time of the liquid pulse shock wave are controlled by replacing pulse pumps of different powers.

2. The method for filling a subsidence column by using electric pulses and water pulses at the same frequency as in claim 1 is characterized in that: The capacitor charging device comprises a capacitor (15), wherein the positive electrode of a capacitor discharge interface (16) of the capacitor (15) is connected to one electrode of a capacitor discharge switch (11), the other electrode of the capacitor discharge switch (11) is connected to a capacitor positive electrode connector (17) by a wire, the negative electrode of the capacitor discharge interface (16) is connected to a capacitor negative electrode connector (18), and the capacitor (15) is connected to a capacitor charging power source (12).

3. The method for filling a subsidence column by using electric pulses and water pulses at the same frequency as in claim 2 is characterized in that: A pressure-maintaining pump switch (8) is installed on the power supply line of the pressure-maintaining pump (5), and the other end of the pressure-maintaining pump switch (8) is connected to the pressure-maintaining pump power supply (9) by a wire.

4. The method for filling a subsidence column by using electric pulses and water pulses at the same frequency as in claim 3 is characterized in that: A pulse pump switch (24) is installed on the power supply line of the pulse pump (22), and the other end of the pulse pump switch (24) is connected to the pulse pump power supply (23) by a wire.

5. The method for filling a subsidence column by using electric pulses and water pulses at the same frequency as in claim 1, 2, 3 or 4, characterized in that: The following steps are included: S100 - After drilling a hole with a drill rod for mining the coal seam, the drill rod is withdrawn, and a capacitor discharge positive electrode (19) and a capacitor discharge negative electrode (20) are fixed in the borehole (1); S200~The borehole is sealed with a cement plugging block (10). At the same time, a pressure balance channel (3), a pressure maintaining tube (4), a capacitor positive electrode connector (17) and a capacitor negative electrode connector (18) are buried in the cement plugging block (10). The capacitor positive electrode connector (17) is connected to the capacitor discharge positive electrode (19), and the capacitor negative electrode connector (18) is connected to the capacitor discharge negative electrode (20). At the same time, a pulse injection tube (28) is buried in the cement plugging block (10), and a one-way valve is fixed on the outer end of the pressure balance channel (3) and the pulse injection tube (28) so that the filling material can only flow into the borehole but not out. S300~A liquid pressure sensor (25) is installed on the left side of the outer end of the pressure balance channel (3), and a valve (27) is installed on the right side of the liquid pressure sensor (25); the outer end of the pressure-maintaining tube (4) is connected to the injection port of the pressure-maintaining pump (5) by a high-pressure tube, the feed port of the pressure-maintaining pump (5) is connected to the flow meter (26), the feed end of the flow meter (26) is connected to the suction tube (6), and the suction tube (6) is placed in the filling material pool (7); the outer end of the pulse injection tube (28) is connected to the pulse pump (22) by a high-pressure tube, the feed port of the pulse pump (22) is connected to the flow meter (26), the feed end of the flow meter (26) is connected to the suction tube (6), and the suction tube (6) is placed in the filling material pool (7); S400~After the borehole (1) is sealed by the cement plugging block (10), the valve (27) on the pressure balance channel (3) is opened to allow the pressure-maintaining pump (5) to pre-fill the borehole with filling material. When the borehole is filled with filling material and overflows from the pressure balance channel (3), the valve (27) on the pressure balance channel (3) is closed, and the pressure-maintaining pump (5) continues to inject material. At the same time, the flow rate change of the flow meter (26) and the pressure change of the liquid pressure sensor (25) are observed. After the values ​​of the two are stable, the relationship curve between the relative pressure in the borehole and time is recorded. Curve 1 is the pressure generated by the pressure-maintaining pump on the collapse column; S500: while the pressure-maintaining pump (5) continuously maintains the pressure in the borehole, the pulse pump (22) is turned on so that the pulse pump (22) pressurizes the borehole at a frequency f, and a relative pressure-time curve when the pulse pump (22) pressurizes is recorded, curve 2, i.e., the pressure generated by the pulse pump on the collapse column; S600~Electric pulses are generated through the capacitor discharge positive electrode (19) and the capacitor discharge negative electrode (20) in the borehole. The energy released by the electric pulses will cause a change in the pressure inside the liquid. The specific relationship curve 3, i.e., the pressure generated by the electric pulses on the collapse column, is recorded; S700~After obtaining curves 1-3, we know from curve 1 that the pulse pump's effect on the pressure value in the borehole is a periodic function. Through the function graph, we stipulate that when curve 1 is at the trough, it is t0, and when it reaches the second trough to the right, it is t1. The period of curve 1 is T0 = t1-t0, and the T0 value remains unchanged after stabilization. Because the speed of electric pulse generation is fast, it is necessary to obtain the time difference T1 between the closing of the capacitor discharge switch (11) and the generation of the peak in curve 3 according to curve 3. At this time, it is necessary to find The difference between T0 and T1 is the best time to close the capacitor discharge switch and generate an electric pulse. The formula for the start time is t=t0+(T0-T1); through the start time formula t of the electric pulse, the electric pulse and the water pulse are made to have the same frequency. Under the action of the pressure-maintaining pump of curve 2, the pressure of the pressure-maintaining pump, the pressure of the pulse pump and the pressure of the electric pulse are superimposed, and the specific relationship curve 4 is recorded, that is, the pressure of the pressure-maintaining pump, the pulse pump and the electric pulse are superimposed, which greatly changes the overall pressure in the borehole and achieves the effect of increasing the injection of the subsidence column. S800~Repeat the operation according to the actual situation of the collapse column until the collapse column filling reaches the expected effect.

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