CN109944576B - Electric pulse enhanced pulsating hydraulic fracturing device and application method thereof - Google Patents
Electric pulse enhanced pulsating hydraulic fracturing device and application method thereof Download PDFInfo
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Abstract
The invention discloses a device for strengthening pulsating hydraulic fracturing by electric pulses, which comprises an underground hydraulic pulsation generating system and an electric pulse generating system; the underground hydraulic pulsation generating system comprises a cylinder body, wherein an opening is formed in the cylinder body, and a jet orifice is formed in the side wall of the lower part of the cylinder body; a pressure-bearing piston, a pressure-bearing spring, a pressure-bearing plate and an electromagnetic switch assembly are arranged in the cylinder body, the pressure-bearing spring is arranged below the pressure-bearing piston, a through hole is formed in the pressure-bearing piston, and the pressure-bearing plate is arranged in the through hole; the electrical pulse generating system includes an electrical pulse generator. In addition, the invention also provides a method for applying the electric pulse reinforced pulsating hydraulic fracturing device. The device can realize the 'water hammer effect' of low frequency, large discharge capacity, high strength and strong impact force, is suitable for volume modification engineering of coal reservoirs and other reservoirs, is favorable for the reservoirs to form a dense and complex fracture network structure, and improves the permeability of the reservoirs.
Description
Technical Field
The invention belongs to the technical field of hydraulic fracturing devices, and particularly relates to an electric pulse reinforced pulsating hydraulic fracturing device and an application method thereof.
Background
The coal bed gas resource in China has great potential and wide development prospect. However, the coal reservoir has the characteristics of low porosity and low permeability, and large-scale commercial exploitation of the coal bed gas is restricted. The traditional reservoir reforming technology is hydraulic fracturing, and wide and large cracks can be formed in a coal seam. The single crack structure makes the hydraulic fracturing technology have unobvious transformation effect in part of coal bed gas wells, and can not greatly improve the productivity of the coal bed gas. The mismatch between the traditional reservoir reforming technology and the special geological conditions of the coal bed becomes a technical bottleneck restricting the development of the coal bed gas industry. Compared with surrounding rock, the coal bed with a complete structure has low mechanical strength and larger brittleness. Experiments show that the dynamic impact load can form a dense fracture network structure in a coal seam, the fracture structure is complex, and primary hole fractures can be effectively communicated.
The pulsating hydraulic fracturing technology is a novel method for reservoir reconstruction at present, realizes the impact action similar to a water hammer by intermittently injecting fracturing fluid into a reservoir, utilizes the impact load action on the reservoir, further improves the fracture network structure and permeability of the reservoir and improves the recovery ratio of coal bed gas. The existing pulsating hydraulic fracturing technology is limited by the volume of equipment, and cannot realize single large-discharge fracturing fluid injection, so that the jet flow strength is low, the impact force is small, and the reconstruction of a long-distance reservoir fracture is limited.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an electric pulse enhanced pulsating hydraulic fracturing device and an application method thereof, aiming at the defects of the prior art. The device can greatly improve the high-pressure fluid volume-able space and single fracturing fluid discharge amount, is assisted with an electric pulse technology to improve the water jet impulse amount, realizes the 'water hammer effect' of low frequency, large discharge amount, high strength and strong impact force, is suitable for volume transformation engineering of coal reservoirs and other reservoirs, is favorable for the reservoirs to form a fracture network structure with high density and complexity, and improves the permeability of the reservoirs.
In order to solve the technical problems, the invention adopts the technical scheme that: an electric pulse reinforced pulsating hydraulic fracturing device is characterized by comprising a downhole hydraulic pulsation generating system and an electric pulse generating system;
the underground hydraulic pulsation generating system comprises a cylinder body, wherein an opening used for connecting a fracturing fluid oil pipe is formed in the cylinder body, and a jet orifice used for allowing fracturing fluid to pass through is formed in the side wall of the lower portion of the cylinder body; a pressure-bearing piston, a pressure-bearing spring, a pressure-bearing plate and an electromagnetic switch assembly for controlling the opening and closing of the pressure-bearing plate are arranged in the cylinder body, the pressure-bearing spring is arranged below the pressure-bearing piston, a through hole which is communicated with the opening and is opposite to the opening is formed in the pressure-bearing piston, and the pressure-bearing plate is arranged in the through hole;
the electric pulse generating system comprises an electric pulse generator arranged in the cylinder body.
The electric pulse intensified pulsating hydraulic fracturing device is characterized in that the electromagnetic switch assembly comprises an electromagnet with a conductive winding and a touch control device for controlling the current supplied to the conductive winding; the touch control device comprises a touch switch, a high-voltage capacitor electrically connected with the touch switch, a switch spring for controlling the touch switch to be switched on and switched off, and a trigger rod for touching the touch switch to open and cut off the touch switch; the trigger switch and the switch spring are arranged in the pressure-bearing piston, one end of the switch spring is fixed on the pressure-bearing piston, and the other end of the switch spring is fixed on the trigger switch; one end of the trigger rod is fixed in the cylinder body, and the other end of the trigger rod extends to the pressure-bearing piston and is used for touching the touch switch; the electromagnet is arranged in the through hole.
The electric pulse reinforced pulsating hydraulic fracturing device is characterized in that the electromagnet is an annular electromagnet and is arranged on the wall surface of the through hole; the high voltage capacitor is located on ground.
The device for strengthening the pulsating hydraulic fracturing by the electric pulses is characterized in that the high-voltage capacitor is connected with the electric pulse generator through a cable.
The electric pulse enhanced pulse hydraulic fracturing device is characterized in that the underground hydraulic pulse generating system further comprises a packer arranged between the oil pipe and the well wall and used for sealing the pre-fracturing working section.
The device for strengthening the pulse hydraulic fracturing by the electric pulse is characterized in that the pressure-bearing piston is also provided with an ultrasonic probe for uniformly mixing fracturing fluid.
The device for strengthening pulsating hydraulic fracturing by using electric pulses is characterized in that a buoyancy plate is fixedly connected below the bearing plate, and a return spring is arranged on one side of the buoyancy plate, which is far away from the electromagnetic switch assembly; one end of the return spring is fixed on the floating plate, and the other end of the return spring is fixed on the pressure-bearing piston.
The device for strengthening the pulsating hydraulic fracturing by the electric pulses is characterized in that the bearing plate is made of steel.
The device for strengthening the pulsating hydraulic fracturing by the electric pulses is characterized in that a flow divider for dividing the fracturing fluid is arranged at the lower part of the cylinder body and opposite to the opening; the electric pulse generator comprises an emitter and a receiver opposite to the emitter, one end of the emitter, far away from the receiver, is connected with the bottom plate of the cylinder body, and one end of the receiver, far away from the emitter, is fixedly connected to the shunt.
In addition, the invention also provides a method for strengthening pulsating hydraulic fracturing by using the device, which is characterized by comprising the following steps:
the fracturing fluid enters the through hole through the oil pipe and the opening and enters a fracturing hydraulic pressure bearing plate in the through hole, the bearing plate drives a bearing piston to move and compress a bearing spring, the electromagnetic switch assembly controls the bearing plate to be opened, and the electric pulse generation system generates shock waves to impact the fracturing fluid to form electric pulse reinforced pulsating hydraulic fracturing fluid which is flushed into a reservoir through the jet orifice.
Compared with the prior art, the invention has the following advantages:
1. the electric pulse reinforced pulsating hydraulic fracturing device organically combines the underground hydraulic pulsation generating system and the electric pulse generating system, greatly improves the high-pressure fluid compatible space and single fracturing fluid discharge amount, improves the water jet impulse amount, realizes the 'water hammer effect' of low frequency, large discharge amount, high strength and strong impact acting force under a reasonable pulse fracturing method, is suitable for volume modification engineering of coal reservoirs and other reservoirs, is beneficial to the reservoir to form a fracture network structure with high density and complexity, and improves the permeability of the reservoir.
2. The device for strengthening pulsating hydraulic fracturing by electric pulse combines the pressure-bearing spring and the pressure-bearing piston to form pressure difference, the pressure-bearing plate in the through hole can seal and separate fracturing fluid in the oil pipe and well bottom fluid, and can also be used as a starting device for fracturing impact, the electromagnetic switch assembly is used as a control device for opening and closing the pressure-bearing plate, the opening and closing of the pressure-bearing plate are controlled by the existence and disappearance of strong magnetism of an electromagnet, the control is easier, and the hydraulic impact is more favorably formed.
3. The device for strengthening the pulsating hydraulic fracturing by the electric pulse comprises an ultrasonic probe, and the ultrasonic probe is connected with an ultrasonic generator and continuously generates ultrasonic waves, so that the fracturing fluid is in a suspension state, and the uniform mixing of the fracturing fluid is facilitated.
4. The device for strengthening the pulsating hydraulic fracturing by the electric pulses has the advantages of simple structure, easy operation and potential application prospect.
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for pulse enhanced hydraulic fracturing according to the present invention;
FIG. 2 is a schematic structural diagram of an electromagnetic switch assembly according to the present invention;
fig. 3 is a flow chart of an application method of the electric pulse enhanced pulsating hydraulic fracturing device of the invention.
Description of the reference numerals
1, a cylinder body; 1-opening; 1-2-spring chamber;
1-3-a splitter; 1-4-jet orifice; 1-5-through holes;
2-a pressure-bearing spring; 3-a pressure-bearing piston; 3-1-touching the switch chamber;
3-2-rod chamber; 4, oil pipe; 5, a bearing plate;
6-buoyancy plate; 7-an electromagnet; 8-a return spring;
9-a trigger lever; 10-touch switch; 11-a switch spring;
12-a cable; 13-an electrical pulse generator; 14-a high voltage capacitor;
15-fracturing truck; 16-an ultrasonic probe; 17-a packer;
18-reservoir; 19-wellbore.
Detailed Description
As shown in fig. 1 and 2, the electric pulse enhanced pulsating hydraulic fracturing device of the invention comprises a downhole hydraulic pulsation generating system and an electric pulse generating system;
the underground hydraulic pulsation generating system comprises a cylinder body 1, wherein an opening 1-1 used for connecting a fracturing fluid oil pipe 4 is formed in the cylinder body 1, and a jet orifice 1-4 used for allowing fracturing fluid to pass through is formed in the side wall of the lower part of the cylinder body 1; a pressure-bearing piston 3, a pressure-bearing spring 2, a pressure-bearing plate 5 and an electromagnetic switch assembly for controlling the opening and closing of the pressure-bearing plate 5 are arranged in the cylinder body 1, the pressure-bearing spring 2 is arranged below the pressure-bearing piston 3, a through hole 1-5 which is communicated with the opening 1-1 and is opposite to the opening 1-1 is formed in the pressure-bearing piston 3, and the pressure-bearing plate 5 is arranged in the through hole 1-5;
the electric pulse generating system comprises an electric pulse generator 13 arranged in the cylinder 1. Fracturing fluid pumped into the oil pipe 4 drives the bearing plate 5 and the bearing piston 3 to move downwards, the bearing piston 3 compresses the bearing spring 2, and the fracturing fluid and bottom hole fluid form pressure difference.
In the present embodiment, as shown in fig. 1 and 2, the electromagnetic switch assembly comprises an electromagnet 7 having an electrically conductive winding and a touch control device for controlling the current supplied to the electrically conductive winding; the touch control device comprises a touch switch 10, a high-voltage capacitor 14 electrically connected with the touch switch 10, a switch spring 11 for controlling the touch switch 10 to be switched on and switched off, and a trigger rod 9 for touching the touch switch 10 to switch the touch switch 10 on and off; the trigger switch 10 and the switch spring 11 are arranged in the pressure-bearing piston 3, one end of the switch spring 11 is fixed on the pressure-bearing piston 3, and the other end of the switch spring 11 is fixed on the trigger switch 10; one end of the trigger rod 9 is fixed in the cylinder body 1, and the other end of the trigger rod 9 extends towards the pressure-bearing piston 3 and is used for touching the touch switch 10; the electromagnet 7 is arranged in the through hole 1-5. The opening 1-1 is positioned at the center of the top surface of the cylinder body 1; a touch switch chamber 3-1 for accommodating a touch switch 10 and a switch spring 11 is arranged in the pressure-bearing piston 3, and a rod chamber 3-2 is communicated below the touch switch chamber 3-1; when the pressure-bearing piston 3 moves downwards, the trigger rod 9 extends upwards in the rod chamber 3-2 relative to the rod chamber 3-2 to be contacted with the touch switch 10; a spring chamber 1-2 for accommodating a pressure-bearing spring 2 is arranged in the cylinder body 1; the pressure-bearing piston 3 is tightly attached to the inner wall of the cylinder body 1, and the pressure-bearing piston 3 is movably arranged in the cylinder body 1.
In the embodiment, the electromagnet 7 is an annular electromagnet, and the electromagnet 7 is installed on the wall surface of the through hole 1-5; the high voltage capacitor 14 is located on ground. When fracturing fluid pumped into the oil pipe 4 drives the bearing plate 5 and the bearing piston 3 to move downwards, the trigger rod 9 contacts and pushes open the trigger switch 10, the trigger switch 10 is opened, the magnetism of the electromagnet 7 disappears, the bearing plate 5 loses force and is in an open state; after primary fracturing is finished, the pressure-bearing piston 3 moves upwards, the trigger rod 9 is far away from the touch switch 10, the touch switch 10 is closed under the action of the restoring force of the switch spring 11, and the electrified electromagnet 7 has strong magnetism and is attached to the pressure-bearing plate 5, so that the pressure-bearing plate 5 is in a closed state; the annular electromagnet can improve the service life of the electromagnetic switch assembly.
In this embodiment, the high-voltage capacitor 14 is connected to the electric pulse generator 13 via the cable 12. The high voltage capacitor 14 improves the reliability and stability of the long term operation of the electrical pulse generator 13 and the touch control device.
In this embodiment, as shown in fig. 1, the downhole hydraulic pulse generating system further includes a packer 17 disposed between the oil pipe 4 and the wall of the well for sealing the pre-fracturing section.
In this embodiment, as shown in fig. 1, an ultrasonic probe 16 for uniformly mixing the fracturing fluid is further installed on the pressure-bearing piston 3. The ultrasonic probe 16 is positioned between the bearing plate 5 and the packer 17; the ultrasonic probe 16 is connected to an ultrasonic generator located on the ground, which is powered by a ground power supply.
In this embodiment, as shown in fig. 1, a floating plate 6 is fixedly connected to the lower portion of the pressure-bearing plate 5, and a return spring 8 is disposed on one side of the floating plate 6, which is far away from the electromagnetic switch assembly; one end of the return spring 8 is fixed on the floating plate 6, and the other end of the return spring 8 is fixed on the pressure-bearing piston 3. The buoyancy plate 6 is bonded on the lower surface of the bearing plate 5 and is used for providing buoyancy of the bearing plate 5; after the primary fracturing is finished, the bearing plate 5 is restored to a closed state under the combined action of the buoyancy plate 6 and the return spring 8.
In this embodiment, the bearing plate 5 is made of steel.
In the embodiment, a flow divider 1-3 for dividing the fracturing fluid is arranged at the lower part in the cylinder body 1 and opposite to the opening 1-1; the electric pulse generator 13 comprises an emitter and a receiver opposite to the emitter, wherein one end of the emitter, which is far away from the receiver, is connected with the bottom plate of the cylinder body 1, and one end of the receiver, which is far away from the emitter, is fixedly connected to the current divider 1-3. The central lines of the oil pipe 4 extending into the exploration well, the opening 1-1, the through hole 1-5 and the inner cavity of the cylinder body 1 are all on the same straight line; the pumping speed of the fracturing truck 15 into the fracturing fluid is not too high, so that the underground hydraulic pulse generator is prevented from being broken down; the midpoint of the connecting line of the emitter and the receiver of the electric pulse generator 13 is A, the intersection point of the central line of the jet ports 1-4 and the central line of the inner cavity of the cylinder body 1 is B, and the midpoint A is superposed with the intersection point B; the high-voltage capacitor 14 discharges after energy storage, the two electrodes of the emitting electrode and the receiving electrode of the electric pulse generator 13 are broken down to form a liquid-electric effect, shock waves are generated and provided for kinetic energy of the fracturing fluid in the horizontal direction, and in the jet flow process of the pulse fracturing fluid, the shock waves act on the pulse fracturing fluid and provide horizontal impulse for the pulse fracturing fluid, so that the impact strength and the acting distance of the pulse fracturing fluid are improved.
The application method of the electric pulse reinforced pulsating hydraulic fracturing device comprises the following steps:
cementing a well, washing the well to clean impurities in a shaft 19, and then perforating the pre-fracturing section according to design requirements; the purpose of the well wash is to prevent debris in the wellbore 19 from entering the reservoir 18;
step two, selecting a pressure-bearing spring 2 according to the pulsating pressure difference of the fracturing fluid and the compression coefficient of the spring; determining the discharge times of the electric pulses in the single pulse process;
connecting an oil pipe 4 with the opening 1-1, and installing a packer 17 for sealing the pre-fracturing section between the oil pipe 4 and the well wall; the electric pulse generator 13 is sent to the lower part in the cylinder body 1 through the oil pipe 4;
step four, starting the fracturing truck 15, adjusting the ground pressure and the discharge capacity, and pumping fracturing fluid into the oil pipe 4; storing energy in the high-voltage capacitor 14, and continuously transmitting ultrasonic waves by the ultrasonic probe 16 to enable the fracturing fluid on the upper part of the pressure bearing plate 5 to be in a suspended state all the time;
pumping fracturing fluid, enabling the fracturing fluid to enter the through holes 1-5 through the oil pipe 4 and the openings 1-1, enabling the fracturing fluid to enter the through holes 1-5 to ballast the pressure bearing plate 5, enabling the pressure bearing plate 5 to drive the pressure bearing piston 3 to move downwards, compressing the pressure bearing spring 2, enabling the trigger rod 9 to contact and push open the trigger switch 10 at the same time, enabling the trigger switch 10 to be opened, enabling the magnetism of the annular electromagnet 7 to disappear, enabling the pressure bearing plate 5 to lose magnetic attraction, enabling the pressure bearing plate 5 to be in an open state, enabling the fracturing fluid to rush to the shunts 1-3, then rushing out from the jet ports 1-4 after shunting through the shunts 1-3, and impacting the reservoir 18;
step six, at the moment that the pressure of the oil pipe is reduced by ground monitoring, the high-voltage capacitor 14 discharges, the electric pulse generator 13 forms shock waves, the fracturing fluid which is flushed to the current divider 1-3 in the step five is pushed, the fracturing fluid is impacted in an accelerated mode, the high-voltage capacitor 14 is charged and discharged circularly to form electric pulse reinforced pulsating hydraulic fracturing fluid, and the fracturing fluid which is impacted by the shock waves is flushed into the reservoir 18 through the jet ports 1-4 to form reinforced impact;
seventhly, the bearing plate 5 moves upwards under the action of the buoyancy plate 6 and the return spring 8, the trigger rod 9 is far away from the touch switch 10, the touch switch 10 is closed under the action of the return force of the switch spring 11, the electromagnet 7 recovers the magnetic force to attract the bearing plate 5, and the bearing plate 5 recovers to a closed state to finish primary electric pulse reinforced pulsating hydraulic fracturing;
step eight, repeating the step four to the step seven until the bottom hole pressure reaches the preset maximum fracturing pressure;
and step nine, unsealing the packer 17, taking out the oil pipe 4, the underground hydraulic pulsation generating system and the electric pulse generator 13, and finishing fracturing.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. An electric pulse reinforced pulsating hydraulic fracturing device is characterized by comprising a downhole hydraulic pulsation generating system and an electric pulse generating system;
the underground hydraulic pulsation generating system comprises a cylinder body (1), wherein an opening (1-1) used for being connected with a fracturing fluid oil pipe (4) is formed in the cylinder body (1), and a jet orifice (1-4) used for allowing fracturing fluid to pass through is formed in the side wall of the lower portion of the cylinder body (1); a pressure-bearing piston (3), a pressure-bearing spring (2), a pressure-bearing plate (5) and an electromagnetic switch assembly for controlling the opening and closing of the pressure-bearing plate (5) are arranged in the cylinder body (1), the pressure-bearing spring (2) is arranged below the pressure-bearing piston (3), a through hole (1-5) which is communicated with the opening (1-1) and is opposite to the opening is formed in the pressure-bearing piston (3), and the pressure-bearing plate (5) is arranged in the through hole (1-5);
the electric pulse generating system comprises an electric pulse generator (13) arranged in the cylinder body (1);
the electromagnetic switch assembly comprises an electromagnet (7) having an electrically conductive winding and a touch control device for controlling the current supplied to the electrically conductive winding; the touch control device comprises a touch switch (10), a high-voltage capacitor (14) electrically connected with the touch switch (10), a switch spring (11) used for controlling the touch switch (10) to be switched on and switched off, and a trigger rod (9) used for touching the touch switch (10) to enable the touch switch (10) to be switched off and switched off; the trigger switch (10) and the switch spring (11) are arranged in the pressure-bearing piston (3), one end of the switch spring (11) is fixed on the pressure-bearing piston (3), and the other end of the switch spring (11) is fixed on the trigger switch (10); one end of the trigger rod (9) is fixed in the cylinder body (1), and the other end of the trigger rod (9) extends towards the pressure-bearing piston (3) and is used for touching the touch switch (10); the electromagnet (7) is arranged in the through hole (1-5).
2. The electric pulse enhanced pulsating hydraulic fracturing device according to claim 1, wherein the electromagnet (7) is a ring-shaped electromagnet, and the electromagnet (7) is installed on the wall surface of the through hole (1-5); the high voltage capacitor (14) is located on ground.
3. The device for pulsed hydraulic fracturing intensified by electric pulses according to claim 1, characterized in that the high-voltage capacitor (14) is connected to the electric pulse generator (13) by a cable (12).
4. The electric pulse enhanced pulsed hydraulic fracturing apparatus of claim 1, wherein the downhole hydraulic pulse generation system further comprises a packer (17) disposed between the tubing (4) and the wall of the wellbore for sealing the pre-fracturing section.
5. The electric pulse enhanced pulsating hydraulic fracturing device as claimed in claim 1, wherein the pressure-bearing piston (3) is further provided with an ultrasonic probe (16) for uniformly mixing fracturing fluid.
6. The electric pulse enhanced pulsating hydraulic fracturing device according to claim 1, wherein a buoyancy plate (6) is fixedly connected below the pressure bearing plate (5), and a return spring (8) is arranged on one side of the buoyancy plate (6) away from the electromagnetic switch assembly; one end of the return spring (8) is fixed on the buoyancy plate (6), and the other end of the return spring (8) is fixed on the pressure-bearing piston (3).
7. The electric pulse enhanced pulse hydraulic fracturing device of claim 1, wherein the bearing plate (5) is made of steel.
8. The electric pulse enhanced pulsating hydraulic fracturing device according to claim 1, wherein a flow divider (1-3) for dividing the fracturing fluid is arranged at the lower part in the cylinder body (1) and opposite to the opening (1-1); the electric pulse generator (13) comprises an emitter and a receiver opposite to the emitter, one end of the emitter, far away from the receiver, is connected with the bottom plate of the cylinder body (1), and one end of the receiver, far away from the emitter, is fixedly connected to the shunt (1-3).
9. A method of electrical pulse enhanced pulsed hydraulic fracturing using the apparatus of claim 1, the method comprising:
fracturing fluid enters the through holes (1-5) through the oil pipes (4) and the openings (1-1) and enters the fracturing fluid ballast pressure bearing plates (5) in the through holes (1-5), the pressure bearing plates (5) drive the pressure bearing pistons (3) to move and compress the pressure bearing springs (2), the electromagnetic switch assembly controls the pressure bearing plates (5) to be opened, the electric pulse generating system generates shock waves to impact the fracturing fluid, and electric pulse reinforced pulse hydraulic fracturing fluid is formed and is flushed into a reservoir through the jet ports (1-4).
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| CN112412425B (en) * | 2020-11-19 | 2021-11-09 | 中国矿业大学 | Electric pulse prefabricated crack directional hydraulic fracturing integrated method |
| CN116906028B (en) * | 2023-07-26 | 2024-01-30 | 中国科学院声学研究所 | Real-time imaging acquisition control system of wall of a well supersound |
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| CN2415157Y (en) * | 2000-01-18 | 2001-01-17 | 石油大学(华东) | Low-frequency oscillating blocking removing device |
| CN105370257A (en) * | 2015-11-06 | 2016-03-02 | 中国矿业大学 | High-power electric-knocking auxiliary hydraulic fracturing production increase method for coal-bed gas well |
| CN105756672A (en) * | 2016-05-05 | 2016-07-13 | 东营市创元石油机械制造有限公司 | Mud fluid pulser for oil drilling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0324717D0 (en) * | 2003-10-22 | 2003-11-26 | Elopak Systems | A valve device for controlling liquid flow |
| WO2013148741A1 (en) * | 2012-03-29 | 2013-10-03 | Shell Oil Company | Electrofracturing formations |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2415157Y (en) * | 2000-01-18 | 2001-01-17 | 石油大学(华东) | Low-frequency oscillating blocking removing device |
| CN105370257A (en) * | 2015-11-06 | 2016-03-02 | 中国矿业大学 | High-power electric-knocking auxiliary hydraulic fracturing production increase method for coal-bed gas well |
| CN105756672A (en) * | 2016-05-05 | 2016-07-13 | 东营市创元石油机械制造有限公司 | Mud fluid pulser for oil drilling |
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