CN110284866B - Shale fracturing device and method - Google Patents
Shale fracturing device and method Download PDFInfo
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- CN110284866B CN110284866B CN201910663825.4A CN201910663825A CN110284866B CN 110284866 B CN110284866 B CN 110284866B CN 201910663825 A CN201910663825 A CN 201910663825A CN 110284866 B CN110284866 B CN 110284866B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005474 detonation Methods 0.000 claims abstract description 146
- 230000005641 tunneling Effects 0.000 claims abstract description 48
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 238000004880 explosion Methods 0.000 claims abstract description 38
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 239000000523 sample Substances 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 claims description 140
- 239000011261 inert gas Substances 0.000 claims description 28
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 230000009172 bursting Effects 0.000 claims description 20
- 239000002360 explosive Substances 0.000 claims description 13
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 12
- 239000004744 fabric Substances 0.000 claims description 12
- 239000003063 flame retardant Substances 0.000 claims description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 claims description 5
- 239000003999 initiator Substances 0.000 claims 3
- 238000010304 firing Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
Abstract
The invention discloses a shale fracturing device and method, the device comprises a circular tunneling drill bit disc, a flexible drill rod is connected and followed behind the circular tunneling drill bit disc, the flexible drill rod is connected to a ground work station, a groove is arranged around the radial side wall of the circular tunneling drill bit disc, an inflatable and bulged anti-riot air bag for sealing is arranged in the groove, and a detonation gas outlet, a detonation ignition nozzle and a detonation gas detection probe are arranged in the central area of the front end surface of the circular tunneling drill bit disc; compared with the traditional manual fracturing mode, the fracturing method of the shale can achieve fracturing of the shale, can remarkably improve the fracturing effect of the shale, and achieves the aim of effectively improving the release amount of the shale adsorbed gas. The range of an explosion zone can be flexibly changed by using the circular tunneling drill bit and the explosion-proof air bag, so that the while-drilling explosion-while-drilling is realized; and can be recycled, and has simple and convenient operation and low cost.
Description
Technical Field
The invention relates to a shale fracturing device and method, which are used for realizing shale fracturing in an explosion mode so as to increase shale gas release.
Background
Aiming at the problems of increasing environmental pollution and increasing energy demand, clean energy is urgently needed to replace traditional petroleum resources and coal resources. Shale gas is a natural gas resource which is reserved in a shale layer and can be mined, the main component of the shale gas is methane, and the global reserves are relatively considerable. Therefore, the development and utilization of shale gas is one of the most important problems at present.
The amount of the recoverable resources of the shale gas in China is first in the world, and the current exploration and exploitation degree is low, but the shale gas has huge development potential, so the development and the utilization of the shale gas are important targets for the industrialized exploration of the natural gas under the existing economic and technical conditions. But the natural communication porosity of shale is low, the airflow resistance ratio is large, and the release rate of shale gas is low. Therefore, in order to increase the release rate of shale gas, shale gas wells all require manual methods to increase the cracking and fracture rate of the surrounding rock.
At present, most of artificial fracturing adopts two methods of hydraulic fracturing and water-saving fracturing, the hydraulic fracturing is a method for releasing natural gas by filling water doped with a large amount of chemical substances into a shale layer for hydraulic fracturing, but the fracturing method not only wastes a large amount of water resources, but also can cause underground water to be soft near a gas well, and damages the local ecological environment, thus facing a large environmental protection risk. In order to reduce the consumption of water resources in the fracturing process, a water-saving fracturing method is proposed, and mainly a method for realizing rock mass cracking by injecting a high-pressure gas-liquid mixture (CO 2 foam or N2 foam) into a drill hole is mainly provided, but the performance of the method is not easy to master, and the construction is very difficult. In addition, both methods realize the yield increase of shale gas by increasing natural through cracks of shale pages, but only the specific surface area of the shale is increased by crushing the shale, so that the yield of the shale gas can be fundamentally improved.
In addition, methods of explosive explosion and thermal exploitation are studied, but the explosive explosion fracturing method is complex in operation, the explosive needs to be refilled after the explosive is exploded again, and great potential safety hazards exist when the explosive is filled, so that the life safety of operators is threatened. The application number is as follows: CN102168543a, method for increasing shale gas recovery ratio by explosion, and application number: the method for extracting shale gas by explosion fracturing and the crack-initiating bomb of CN105804716A are characterized in that the explosive is put into an explosive-conveying detonating device in advance, the explosive is required to be replaced when the explosive is exploded again, the explosive cannot be recycled, and meanwhile, great difficulty exists in replacing and filling the explosive. In addition, thermal mining is an emerging mining method in recent years, but the method has low recovery ratio, uses a large amount of thermal resources and has high input cost in the early stage. The application number is as follows: the main idea of the thermodynamic exploitation method of coal bed gas of CN1508387 is that a microwave generator is adopted to heat water so as to heat generated by the water to fracture an exploited layer. However, this method causes a great loss of heat, resulting in waste of resources.
Disclosure of Invention
The invention aims to provide a shale fracturing device and method, which form an explosion space by drilling, convey mixed gas to the explosion space by utilizing a channel arranged on a drill rod to detonate, then withdraw the rod to realize continuous explosion, and flexibly change the range of an explosion area to realize while-drilling explosion; and can be recycled, and has simple and convenient operation and low cost.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the utility model provides a shale fracturing device, including circular tunneling drill bit dish, be provided with the knife rest at the preceding terminal surface of circular tunneling drill bit dish, the radial lateral wall of circular tunneling drill bit dish is stretched out to the tip in the knife rest radial outside tip, be provided with the hobbing cutter drill bit on the knife rest, be connected at circular tunneling drill bit dish back and follow flexible drilling rod, flexible drilling rod is connected to ground work station, flexible drilling rod drives circular tunneling drill bit dish and rotates, wherein, radial lateral wall around circular tunneling drill bit dish is provided with the recess, be provided with the explosion-proof air bag that is used for sealed inflatable bulge in the recess, be provided with detonation gas outlet in circular tunneling drill bit dish terminal surface central region, detonation ignition mouth and detonation gas detection probe in circular tunneling drill bit dish terminal surface central region, be provided with respectively with detonation gas outlet at circular tunneling drill bit dish back terminal surface central region, detonation mouth, detonation gas detection probe and explosion-proof air bag are connected corresponding interface, be provided with detonation gas injection pipeline in the flexible drilling rod, detonation ignition cable, detonation gas detection cable and inert gas inflation pipeline, through corresponding interface, detonation gas injection pipeline and detonation gas outlet connection, detonation ignition cable and detonation ignition gas detection cable are connected with detonation gas detection probe, detonation gas detection probe and detonation gas inflation pipeline, detonation gas injection control valve and detonation gas inflation pipeline are connected at detonation work station ground station, detonation gas control and detonation gas injection valve and detonation gas control storage tank, detonation gas injection control and detonation valve and detonation gas injection control valve.
The scheme is further as follows: the inert gas is nitrogen and the detonation gas is oxygen.
The scheme is further as follows: the detection signal of the detonation gas detection probe is connected with the detonation controller through a signal amplification circuit, and the signal amplification circuit is connected with the end side of the corresponding interface in the detonation gas detection cable in series.
The scheme is further as follows: the electric ignition nozzle is connected with an electric ignition detonation circuit which is connected with the end side of the corresponding interface in the detonation ignition cable in series.
The scheme is further as follows: the explosion-proof air bag is a flame-retardant cloth air bag, and a metal protection net is arranged on the outer side of the flame-retardant cloth.
A shale fracturing method based on the shale fracturing device, which performs bursting within a determined fracturing area, characterized in that the method comprises the following steps:
the first step: starting an air pump to extract the gas in the explosion-proof air bag to be in a flat shape and attached in a groove arranged around the side wall of the circular tunneling drill bit disc, and then disconnecting the groove to seal the port of the inert gas charging pipeline; at the same time: disconnecting the detonation controller from the detonation ignition cable and the detonation gas detection cable, disconnecting the detonation gas injection pipeline from the detonation gas storage tank, and starting the flexible drill rod to drive the circular tunneling drill bit disc to rotate and drill until reaching the fracturing area;
and a second step of: the flexible drill rod is kept to drive the circular tunneling drill bit disc to rotate and drill, drilling is stopped after the drilling reaches the set explosion fracturing length, and the circular tunneling drill bit disc is moved backwards to reserve the length space of the bursting area;
and a third step of: the method comprises the steps of establishing connection between a detonation controller and a detonation ignition cable as well as between a detonation gas detection cable, establishing connection between an inert gas charging pipeline and an inert gas storage tank through a gas feeding pump and a gas extracting pump, and establishing connection between a detonation gas injection pipeline and the detonation gas storage tank;
fourth step: inert gas is injected into the explosion-proof air bag to expand to the wall of the drilling hole to seal the bursting area length space from the outside;
fifth step: detecting whether the concentration of the detonatable gas in the bursting area length space reaches an explosion condition or not through a detonating gas detection probe, and if the concentration does not reach the explosion condition, sending the detonating gas into the bursting area length space through a detonating gas injection pipeline by a detonating gas storage tank until the concentration reaches the explosion condition;
sixth step: the electric ignition initiation circuit is started, and the ignition nozzle is used for igniting the detonation gas to be blasted in the length space of the bursting area so as to realize the fracturing of shale;
seventh section: starting an air pump to extract the gas in the explosion-proof air bag to be in a flat shape and attached in a groove arranged around the side wall of the circular tunneling drill bit disc, and then disconnecting the groove to seal the port of the inert gas charging pipeline; at the same time: and (3) disconnecting the detonation controller from the detonation ignition cable and the detonation gas detection cable, disconnecting the detonation gas injection pipeline from the detonation gas storage tank, starting the flexible drill rod to drive the circular tunneling drill bit disc to rotate and drill, and returning to the second step to continuously perform explosion until the explosion is performed within the determined fracturing area.
The scheme is further as follows: the explosion-proof air bag is a flame-retardant cloth air bag, and a metal protection net is arranged on the outer side of the flame-retardant cloth.
The scheme is further as follows: the explosion condition is an explosion condition determined according to an explosion level.
The scheme is further as follows: the inert gas is nitrogen and the detonation gas is oxygen.
The scheme is further as follows: the detection signal of the detonation gas detection probe is connected with the detonation controller through a signal amplification circuit, and the signal amplification circuit is connected with the end side of the detonation gas detection cable connected with the corresponding interface in series; the electric ignition nozzle is connected with an electric ignition detonation circuit which is connected with the end side of the corresponding interface in the detonation ignition cable in series.
Compared with the current domestic and foreign shale gas exploitation methods, the method has the following remarkable technical advantages:
(1) Compared with the traditional manual fracturing mode, the fracturing of shale is realized in the mode, the fracturing effect of shale can be remarkably improved, and the aim of effectively improving the release amount of shale adsorption gas is fulfilled.
(2) The range of an explosion zone can be flexibly changed by using the circular tunneling drill bit and the explosion-proof air bag, so that the while-drilling explosion-while-drilling is realized; and can be recycled, and has simple and convenient operation and low cost.
(3) The injection quantity of oxygen is controlled by the concentration real-time display instrument, so that the explosion effect can be accurately controlled.
The invention is described in detail below with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the device;
FIG. 2 is a schematic front view of a round entry bit;
FIG. 3 is a schematic side view of a round entry bit.
Detailed Description
Example 1:
as shown in fig. 1, 2 and 3, the shale fracturing device comprises a circular tunneling drill disc 1, the circular tunneling drill disc is identical to a traditional drilling tool, a cutter rest 2 is arranged on the front end face of the circular tunneling drill disc, a radial end part 201 of the cutter rest extends out of a radial end part side wall 102 of the circular tunneling drill disc, a hob drill 3 and a scraper 4 are distributed on the cutter rest, a flexible drill rod 5 is connected and follows behind the circular tunneling drill disc, the flexible drill rod is connected to a ground workstation, the flexible drill rod drives the circular tunneling drill disc to rotate, and the shale fracturing device is different from the traditional drilling tool in that: a groove 103 is formed around the radial side end wall of the circular tunneling drill bit disc, an inflatable bulge explosion-proof air bag 6 for sealing is arranged in the groove, a detonation gas outlet 7, a detonation ignition nozzle 8 and a detonation gas detection probe 9 are arranged in the central area of the front end surface of the circular tunneling drill bit disc, a detonation gas outlet interface 10, a detonation nozzle interface 11, a detonation gas detection probe interface 12 and an explosion-proof air bag interface 13 are respectively arranged in the central area of the rear end surface of the circular tunneling drill bit disc, the detonation gas outlet interface 10 penetrates through the circular tunneling drill bit disc to be connected with the detonation gas outlet 7, the detonation nozzle interface 11 is connected with the detonation ignition nozzle 8, the detonation gas detection probe interface 12 is connected with the detonation gas detection probe 9, and the explosion-proof air bag interface 13 is connected with the explosion-proof air bag 6; the flexible drill rod is provided with a shaft hole 501, a detonation gas injection pipeline 14, a detonation ignition cable 15, a detonation gas detection cable 16 and an inert gas charging pipeline 17 are laid in the shaft hole, the detonation gas injection pipeline is connected with a detonation gas outlet, the detonation ignition cable is connected with a detonation nozzle, the detonation gas detection cable is connected with a detonation gas detection probe, the inert gas charging pipeline is connected with an explosion-proof air bag, an inert gas storage tank 19, a detonation gas storage tank 20 and a detonation controller 21 are arranged in a ground work station 18, the inert gas charging pipeline is connected with the inert gas storage tank 19 through an air pump 22 and an air pump 23, the detonation gas injection pipeline is connected with the detonation gas storage tank 20, and the detonation controller 21 is respectively connected with an inert gas storage tank valve 19-1, a detonation gas storage tank valve 20-1, the detonation ignition cable and the detonation gas detection cable.
Wherein: the inert gas is various, nitrogen is preferred in the embodiment, and oxygen is preferred in the detonation gas.
In the examples: the detection signal of the detonation gas detection probe is connected with the detonation controller through a signal amplification circuit, and the signal amplification circuit is connected with the end side of the detonation gas detection cable connected with the corresponding interface in series, namely the end side of the detonation gas detection cable close to the interface. And the detonation ignition nozzle is an electric ignition nozzle, the electric ignition nozzle is connected with an electric ignition detonation circuit, and the electric ignition detonation circuit is connected in series with the detonation ignition cable at the end side connected with the corresponding interface, namely the detonation ignition cable is close to the interface end side.
As the explosion-proof air bag in the embodiment, an air bag made of asbestos coated with flame-retardant canvas or glass fiber cloth is used, a metal protection net is arranged on the outer side of the flame-retardant cloth to protect the air bag from being scratched by the stone which is drilled and flows backwards from the edge, and the explosion-proof air bag is shown in a contracted state in fig. 3.
Example 2:
in the shale fracturing method, the main component of shale gas is CH4, when O2 is mixed and a certain proportion condition is met, the mixed gas can explode once sparks are seen. After the shale gas well is drilled, shale gas in shale around the gas well is initially released. The shale gas well can form a closed space through a certain measure, O2 which meets the explosion condition is injected into the closed space, and then the closed space is exploded by ignition, so that the surrounding shale is fractured, and the shale fracturing device disclosed in the embodiment 1 is provided; the present embodiment method is a method based on the shale fracturing apparatus of embodiment 1, and thus the contents of embodiment 1 should be considered as part of the contents of the present embodiment, the apparatus performing a burst within a defined fracture zone, the method comprising:
the first step: starting an air pump to extract the gas in the explosion-proof air bag to be in a flat shape and attached in a groove arranged around the side wall of the circular tunneling drill bit disc, and then disconnecting the groove to seal the port of the inert gas charging pipeline; at the same time: disconnecting the detonation controller from the detonation ignition cable and the detonation gas detection cable, disconnecting the detonation gas injection pipeline from the detonation gas storage tank, and starting the flexible drill rod to drive the circular tunneling drill bit disc to rotate and drill until reaching the fracturing area;
and a second step of: keeping the flexible drill rod to drive the circular tunneling drill bit disc to rotate and drill, stopping drilling after the drilling reaches a set explosion fracturing length, and moving the circular tunneling drill bit disc backwards, so as to leave a bursting area length space 24 as shown in fig. 1;
and a third step of: the method comprises the steps of establishing connection between a detonation controller and a detonation ignition cable as well as between a detonation gas detection cable, establishing connection between an inert gas charging pipeline and an inert gas storage tank through a gas feeding pump and a gas extracting pump, and establishing connection between a detonation gas injection pipeline and the detonation gas storage tank;
fourth step: inert gas is injected into the explosion-proof air bag to expand to the wall of the drilling hole to seal the bursting area length space from the outside;
fifth step: detecting whether the concentration of the detonatable gas in the bursting area length space reaches an explosion condition or not through a detonating gas detection probe, and if the concentration does not reach the explosion condition, sending the detonating gas into the bursting area length space through a detonating gas injection pipeline by a detonating gas storage tank until the concentration reaches the explosion condition;
sixth step: the electric ignition initiation circuit is started, and the ignition nozzle is used for igniting the detonation gas to be blasted in the length space of the bursting area so as to realize the fracturing of shale;
seventh section: starting an air pump to extract the gas in the explosion-proof air bag to be in a flat shape and attached in a groove arranged around the side wall of the circular tunneling drill bit disc, and then disconnecting the groove to seal the port of the inert gas charging pipeline; at the same time: and (3) disconnecting the detonation controller from the detonation ignition cable and the detonation gas detection cable, disconnecting the detonation gas injection pipeline from the detonation gas storage tank, starting the flexible drill rod to drive the circular tunneling drill bit disc to rotate and drill, and returning to the second step to continuously perform explosion until the explosion is performed within the determined fracturing area.
In the examples: the explosion condition is determined according to the explosion grade; that is, by this method, the concentration of the detonatable gas in the bursting area length space is adjusted according to the bursting level requirement so that it detonates under the conditions required to reach the bursting level. The method can control the injection amount of oxygen through the concentration real-time display instrument, and can accurately control the explosion effect.
The same as in example 1: the explosion-proof air bag is a flame-retardant cloth air bag, and a metal protection net is arranged on the outer side of the flame-retardant cloth. And: the inert gas is nitrogen and the detonation gas is oxygen. The detection signal of the detonation gas detection probe is connected with the detonation controller through a signal amplification circuit, and the signal amplification circuit is connected with the end side of the corresponding interface in the detonation gas detection cable in series. The electric ignition nozzle is connected with an electric ignition detonation circuit which is connected with the end side of the corresponding interface in the detonation ignition cable in series.
Claims (8)
1. The shale fracturing device comprises a circular tunneling drill bit disc, wherein a cutter rest is arranged on the front end face of the circular tunneling drill bit disc, the end part of the radial outer side of the cutter rest extends out of the radial side wall of the circular tunneling drill bit disc, hob drills are distributed on the cutter rest, flexible drill rods are connected and followed behind the circular tunneling drill bit disc and connected to a ground work station, the flexible drill rods drive the circular tunneling drill bit disc to rotate.
The detection signal of the detonation gas detection probe is connected with the detonation controller through a signal amplification circuit, and the signal amplification circuit is connected with the end side of the detonation gas detection cable connected with the corresponding interface in series;
the explosion-proof air bag is a flame-retardant cloth air bag, and a metal protection net is arranged on the outer side of the flame-retardant cloth.
2. The shale fracturing device of claim 1, wherein the inert gas is nitrogen and the detonation gas is oxygen.
3. The shale fracking apparatus of claim 1, wherein the detonation initiator is an electric initiator, the electric initiator being connected to an electric ignition initiation circuit, the electric ignition initiation circuit being connected in series with the detonation firing cable on the side of the end of the detonation firing cable connected to the corresponding interface.
4. A shale fracturing method based on the shale fracturing device of claim 1, the device performing bursting within a defined fracture zone, the method comprising:
the first step: starting an air pump to extract the gas in the explosion-proof air bag to be in a flat shape and attached in a groove arranged around the side wall of the circular tunneling drill bit disc, and then disconnecting the groove to seal the port of the inert gas charging pipeline; at the same time: disconnecting the detonation controller from the detonation ignition cable and the detonation gas detection cable, disconnecting the detonation gas injection pipeline from the detonation gas storage tank, and starting the flexible drill rod to drive the circular tunneling drill bit disc to rotate and drill until reaching the fracturing area;
and a second step of: the flexible drill rod is kept to drive the circular tunneling drill bit disc to rotate and drill, drilling is stopped after the drilling reaches the set explosion fracturing length, and the circular tunneling drill bit disc is moved backwards to reserve the length space of the bursting area;
and a third step of: the method comprises the steps of establishing connection between a detonation controller and a detonation ignition cable as well as between a detonation gas detection cable, establishing connection between an inert gas charging pipeline and an inert gas storage tank through a gas feeding pump and a gas extracting pump, and establishing connection between a detonation gas injection pipeline and the detonation gas storage tank;
fourth step: inert gas is injected into the explosion-proof air bag to expand to the wall of the drilling hole to seal the bursting area length space from the outside;
fifth step: detecting whether the concentration of the detonatable gas in the bursting area length space reaches an explosion condition or not through a detonating gas detection probe, and if the concentration does not reach the explosion condition, sending the detonating gas into the bursting area length space through a detonating gas injection pipeline by a detonating gas storage tank until the concentration reaches the explosion condition;
sixth step: the electric ignition initiation circuit is started, and the ignition nozzle is used for igniting the detonation gas to be blasted in the length space of the bursting area so as to realize the fracturing of shale;
seventh step: starting an air pump to extract the gas in the explosion-proof air bag to be in a flat shape and attached in a groove arranged around the side wall of the circular tunneling drill bit disc, and then disconnecting the groove to seal the port of the inert gas charging pipeline; at the same time: and (3) disconnecting the detonation controller from the detonation ignition cable and the detonation gas detection cable, disconnecting the detonation gas injection pipeline from the detonation gas storage tank, starting the flexible drill rod to drive the circular tunneling drill bit disc to rotate and drill, and returning to the second step to continuously perform explosion until the explosion is performed within the determined fracturing area.
5. The shale fracturing method of claim 4, wherein the explosion-proof air bag is a flame-retardant cloth air bag, and a metal protection net is arranged outside the flame-retardant cloth.
6. The shale fracturing method of claim 4, wherein the explosive condition is an explosive condition determined from an explosive grade.
7. The shale fracturing method of claim 4, wherein the inert gas is nitrogen and the detonation gas is oxygen.
8. The shale fracturing method of claim 4, wherein the detection signal of the detonation gas detection probe is connected with the detonation controller through a signal amplification circuit, and the signal amplification circuit is connected with the end side of the corresponding interface in the detonation gas detection cable in series; the electric ignition nozzle is connected with an electric ignition detonation circuit which is connected with the end side of the corresponding interface in the detonation ignition cable in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910663825.4A CN110284866B (en) | 2019-07-23 | 2019-07-23 | Shale fracturing device and method |
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| CN201910663825.4A CN110284866B (en) | 2019-07-23 | 2019-07-23 | Shale fracturing device and method |
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| CN110284866A CN110284866A (en) | 2019-09-27 |
| CN110284866B true CN110284866B (en) | 2024-02-09 |
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