CN116398106B - Shale reservoir in-situ analysis methane high-efficiency utilization and multistage energy-gathering combustion explosion fracturing method - Google Patents
Shale reservoir in-situ analysis methane high-efficiency utilization and multistage energy-gathering combustion explosion fracturing method Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 196
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 44
- 238000004880 explosion Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010249 in-situ analysis Methods 0.000 title claims abstract description 12
- 238000005422 blasting Methods 0.000 claims abstract description 27
- 238000011065 in-situ storage Methods 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000012856 packing Methods 0.000 claims abstract description 13
- 238000005474 detonation Methods 0.000 claims abstract description 12
- 239000011148 porous material Substances 0.000 claims abstract description 11
- 230000035939 shock Effects 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 57
- 230000000694 effects Effects 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 13
- 239000004215 Carbon black (E152) Substances 0.000 claims description 9
- 229930195733 hydrocarbon Natural products 0.000 claims description 9
- 150000002430 hydrocarbons Chemical class 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 8
- 239000003345 natural gas Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 238000001179 sorption measurement Methods 0.000 claims description 5
- 239000002360 explosive Substances 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
- E21B43/117—Shaped-charge perforators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a shale reservoir in-situ analysis methane high-efficiency utilization and multistage energy-gathering blasting fracturing method, which comprises the following steps: constructing shale reservoir pore canals in a horizontal well; installing a packing device for the horizontal well; extracting gas from the closed space of the packing device; putting a gaseous combustion improver into the closed space to form a gaseous combustion improver mixture; igniting, blasting and fracturing the gaseous combustion improver mixture to enable cracks in the well wall of the horizontal well to develop and penetrate; and repeatedly carrying out gas extraction and ignition explosion fracturing to form a highly complex and effective three-dimensional fracture network in the horizontal well. The invention can realize the on-site collection and high-efficiency utilization of methane, avoid the safety risk of ground transportation, utilize the in-situ resolved methane and the manually injected combustion improver to mix and burn for many times to generate detonation shock waves, high-pressure detonation gas and high Wen Xiaoying to cooperatively crack the shale gas reservoir, promote the development of a crack network and improve the gas production rate.
Description
Technical Field
The invention belongs to the technical fields of unconventional oil gas exploitation and shale gas fracturing yield increase, and particularly relates to a shale reservoir in-situ analysis methane high-efficiency utilization and multistage energy-gathering burning and explosion fracturing method.
Background
Shale gas is unconventional natural gas in organic shale and interlayer thereof in free state and adsorption state, and the main component is methane. However, the efficient development of shale gas still faces a plurality of problems to be overcome, wherein the formation of a complex fracture network in a reservoir is widely considered as an important precondition for realizing the efficient development of shale gas reservoirs, so that the modification of the reservoir layer to form a complex network system of a trench-through shale gas reservoir and a shaft is very important. Although the conventional hydraulic fracturing can effectively reform the shale reservoir, but brings potential risks such as groundwater pollution, fresh water consumption, leakage of fracturing chemicals, backflow and the like, in order to overcome the problems, in recent years, expert students propose a reformable in-situ multistage methane burning and explosion fracturing technology in a shaft so as to obtain a well-developed complex fracture network, and effectively reform the shale reservoir.
The methane in-situ multistage explosion technology has a plurality of advantages, but is also limited correspondingly. After the primary blasting is completed in the horizontal well and the pore canal, a large amount of non-methane gas such as carbon dioxide can be generated, so that the concentration and purity of methane are low and cannot reach the ideal blasting effect, the subsequent multistage blasting fracturing effect is influenced, and therefore the methane gas in the horizontal well and the pore canal needs to be purified and supplemented, and the safety risks such as methane ground transportation and the like can be involved. In order to ensure the effect of multistage blasting fracturing and reduce potential safety hazards, an in-situ methane efficient utilization method and a multistage blasting fracturing method are required to be sought so as to obtain an effective fracture network and improve the gas production rate of shale gas.
Disclosure of Invention
The invention aims to provide a shale reservoir in-situ analysis methane high-efficiency utilization and multi-stage energy-gathering combustion and explosion fracturing method, which aims to solve the problems in the prior art.
In order to achieve the aim, the invention provides a shale reservoir in-situ analysis methane high-efficiency utilization and multistage energy-gathering combustion explosion fracturing method, which comprises the following steps:
s1, constructing shale reservoir pore canals in a horizontal well;
s2, installing a packing device for the horizontal well;
s3, extracting gas from the closed space of the packing device;
S4, putting a gaseous combustion improver into the closed space to form a gaseous combustion improver mixture;
s5, performing ignition, explosion and fracturing on the gaseous combustion improver mixture to enable cracks in the well wall of the horizontal well to develop and penetrate;
s6, repeatedly executing S3-S5, and forming a highly complex and effective three-dimensional fracture network in the horizontal well.
Optionally, the S1 includes:
And (3) conveying the shaped perforating device into the horizontal well through the continuous oil pipe, carrying out multi-section shaped perforating on the horizontal well, forming a plurality of three-dimensional pore channels on a shale reservoir layer of a well wall of the horizontal well to form a section to be fractured, extracting the shaped perforating device to the ground after the shaped perforating operation is completed, replacing the shaped perforating device again, conveying the shaped perforating device into the position in the horizontal well close to the last perforating operation by the continuous oil pipe again, and repeating the perforating operation for 3-5 times.
Optionally, the shaped-charge perforating device comprises a perforating gun, a positioner and a positive tube device, wherein the position of the perforating device is determined through the positioner, and the position of the gun mouth of the perforating gun is adjusted through the positive tube device.
Optionally, the S2 includes:
the packer is put in a section to be fractured in a horizontal well through a coiled tubing, and the packer is fixed with the shale reservoir well wall;
An igniter, a methane concentration sensor and a coiled tubing head are fixedly arranged on one side of the sealing space of the sealing device; pumping or inputting gas into the closed space to be fractured through the coiled tubing head; the coiled tubing head is internally provided with a valve and penetrates through the packing device; the pressure bearing capacity of the packing device and the coiled tubing head is not lower than 200MPa.
Optionally, the S3 includes:
Extracting gas from the closed space of the packing device based on an industrial air extractor to further analyze methane gas in an adsorption state in a shale reservoir fracture;
and separating and analyzing the extracted gas into methane light hydrocarbon gas based on natural gas separation equipment, and storing the methane light hydrocarbon gas in a methane storage tank.
Optionally, the S4 includes:
and displaying the methane concentration in the closed space based on the methane concentration sensor, and inputting the gaseous combustion improver into the closed space through the continuous oil pipe based on the air compressor when the methane concentration reaches a proper burning explosion range to form a gaseous combustion improver mixture.
Optionally, if the methane concentration in the enclosed space does not reach the proper blasting condition, the methane light hydrocarbon gas stored in the methane storage tank after ground separation is input into the enclosed space based on the air compressor until the optimal blasting concentration is reached.
Optionally, the S5 includes:
And an igniter based on the sealing and insulating device ignites and burns the gaseous combustion improver mixture in the closed space, and detonation shock waves, high-pressure detonation gas and high-temperature effects generated by the burning and explosion are utilized to cooperatively impact the shale gas reservoir so as to promote crack development and penetration.
The invention has the technical effects that:
According to the invention, methane gas analyzed in situ of the shale reservoir is mixed with the combustion improver which is injected manually for many times, detonation shock waves are generated by ignition and detonation, the high-pressure detonation gas and the high-temperature effect cooperatively impact the shale gas reservoir, and the shale reservoir is continuously reformed, so that an effective three-dimensional fracture network is obtained. The methane explosion limit in the air is 5% -15%, when pure oxygen is used as a combustion improver, the highest explosion limit can reach 61%, the methane concentration determines the explosion effect to a great extent, and the explosion effect directly influences the shale reservoir transformation effect, so that in order to obtain the optimal explosion effect, the methane can reach the optimal explosion concentration in the closed space. The gas in the airtight space of the horizontal well explosion section is pumped, the pressure in the airtight space is reduced, the analysis of methane adsorption in a reservoir crack is further promoted, the pumped impurity gas is separated and purified from light hydrocarbon gas such as methane on the ground, and the pumped impurity gas can be supplemented into the airtight space to ensure the optimal explosion concentration of the methane in the multistage explosion process; the method can be suitable for horizontal well section blasting fracturing within a single larger length range, and greatly improves shale reservoir transformation efficiency. The method is simple and effective, the blasting methane comes from in-situ analysis and on-site ground purification, processes such as ground transportation and the like are omitted, the safety advantage is obvious, and the method has wide application value in the field.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a complex three-dimensional network in a shale reservoir after multi-stage energy-gathering blasting in an embodiment of the invention;
FIG. 2 is a schematic diagram of a shaped-charge perforation device in a horizontal well shale reservoir perforation tunnel in an embodiment of the present invention;
FIG. 3 is a schematic view of a perforation tunnel and packer after multiple perforation operations in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of the ground work and the underground work in the embodiment of the invention;
In the figure: perforating gun 1, positioner 2, positive tubing 3, connector 4, horizontal well 5, coiled tubing 6, perforation tunnel 7, packer 8, methane concentration sensor 9, coiled tubing head 10, igniter 11, three-way valve 12, industrial air extractor 13, natural gas separation device 14, methane storage tank 15, air compressor 16, combustion improver storage tank 17, complex three-dimensional fracture network 18.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Example 1
As shown in fig. 1-3, the embodiment provides a shale reservoir in-situ analysis methane high-efficiency utilization and multi-stage energy-gathering combustion and explosion fracturing method, which comprises the following steps:
step one: forming a shale reservoir pore canal of a horizontal well;
As shown in fig. 2, the shaped perforating device is conveyed into the horizontal well 5 through the coiled tubing 6, multi-section shaped perforating is carried out on the horizontal well 5, a plurality of three-dimensional pore channels 7 are formed on a shale reservoir of a well wall of the horizontal well, a section to be fractured is formed, after the shaped perforating operation is completed, the shaped perforating device is extracted to the ground, the shaped perforating device is replaced again, and the shaped perforating device is conveyed into the position, close to the last perforating operation position, in the horizontal well 5 through the coiled tubing 6 again to continue perforating operation, and the operation is repeated for 3-5 times.
Step two: installing a packing device;
The packer is put in the section to be fractured in the horizontal well 5 through the coiled tubing 6, and is well fixed with the shale reservoir well wall. An igniter 11, a methane concentration sensor 9 and a coiled tubing head 10 are fixedly arranged on one side of the sealing space of the sealing device. The coiled tubing head 10 is used for pumping or inputting gas into the closed space to be fractured, as shown in fig. 3.
Step three: extracting gas in the closed space;
After the sealing device is installed, more impurity gas is mixed in the sealed space, the methane concentration is difficult to reach the optimal blasting concentration, the three-way valve 12 is opened, the gas in the sealed space is extracted through the industrial air extractor 13, the pressure is reduced, the methane gas in the adsorption state in the shale reservoir cracks is further analyzed, and the methane concentration is increased. Specifically, the extracted gas enters the natural gas separation facility 14, and the light hydrocarbon gas such as methane is separated and analyzed, and stored in the methane storage tank 15.
Step four: putting in a gaseous combustion improver;
When the methane concentration sensor 9 shows that the methane concentration in the enclosed space reaches the proper explosion range, the air compressor 16 is used for inputting the gaseous combustion improver in the combustion improver storage tank 17 into the enclosed space through the continuous oil pipe 6 to form a methane-gaseous combustion improver mixture.
Step five: igniting, burning and cracking;
Igniting and blasting the methane-gaseous combustion improver mixture in the closed space through an igniter 11 on the packer, and utilizing detonation shock waves, high-pressure blasting gas and high-temperature effects generated by blasting to cooperatively impact a shale gas reservoir so as to promote crack development and penetration in the perforation tunnels 7 and the walls of the horizontal wells 5;
Step six: in-situ methane multistage blasting fracturing;
After primary blasting fracturing, a large amount of equal gas is generated in the closed space, the concentration of methane is low, the steps three, four and five are repeatedly carried out, methane in-situ blasting fracturing is continuously carried out on the complex fracture network around the horizontal shaft 5 and the perforation 7 pore canal, the complex network is promoted to continuously expand and grow until a highly complex and effective three-dimensional fracture network 18 is formed, as shown in fig. 1.
Preferably, the shaped perforating device comprises a perforating gun 1, a positioner 2 and a pipe corrector 3, wherein the positioner 2 is used for determining the position of the perforating device so as to ensure continuous perforating operation on the shale reservoir segments of the horizontal well section in a segmented manner, and a section to be detonated with a considerable length range is formed; the positive tube device 3 is used for adjusting the gun muzzle position of the perforating gun.
Preferably, the bearing capacity of the packer 8 and the coiled tubing head 10 is not lower than 200MPa.
Preferably, the coiled tubing head 10 has a built-in valve and extends through the packer 8
Preferably, a cable for connecting the methane concentration sensor 9, the igniter 11 and controlling the valve opening and closing of the coiled tubing head 10 is run through the coiled tubing 6.
Preferably, the specific passage opening and closing of the three-way valve 12 depends on the extraction or input of gas into the enclosed space;
Preferably, the gaseous combustion improver is pure oxygen.
Preferably, when the concentration of methane in-situ resolved in the closed space does not reach a proper blasting condition, methane stored in the methane storage tank 15 after ground separation is input into the closed space through the air compressor 16 until the optimal blasting concentration is reached, and then the gaseous combustion improver is injected to form a blasting mixture.
Example two
As shown in fig. 4, another implementation manner of the shale reservoir in-situ analysis methane high-efficiency utilization and multi-stage energy-gathering explosive fracturing method is provided in the embodiment, wherein the used devices comprise an energy-gathering perforating device, a ground working system and a downhole working system.
After the jet flow pore canal is formed on the shale reservoir of the horizontal well by the shaped perforating device, the underground working system is put into the underground horizontal well section through the continuous oil pipe, the packer and the horizontal well form a closed space, when the concentration of methane reaches the concentration requirement, the combustion improver is sent into the closed space by the air compressor, the combustion improver is ignited and detonated through the igniter, and the crack expansion of the reservoir is promoted by the methane in-situ blasting impact. The method comprises the steps of burning and explosion to generate a large amount of non-methane gas, reducing the concentration of methane in a closed space to influence the subsequent burning and explosion performance, pumping the gas in the closed space after burning and explosion by an industrial air pump, sending the gas into a natural gas separation device to separate light hydrocarbon gas such as methane and the like, storing the gas in a methane storage tank for supplementing when the concentration of methane in the closed space is insufficient, simultaneously reducing the pressure in the closed space to further promote the analysis of methane in a natural crack, sending a combustion improver to carry out secondary burning and explosion when the concentration of methane reaches the optimal burning and explosion requirement, and circularly and reciprocally realizing multi-stage cycle energy-gathering burning and explosion fracturing of a shale reservoir.
The invention can realize the on-site collection and high-efficiency utilization of methane, avoid the safety risk of ground transportation, utilize the in-situ resolved methane and the manually injected combustion improver to mix and burn for many times to generate detonation shock waves, high-pressure detonation gas and high Wen Xiaoying to cooperatively crack the shale gas reservoir, promote the development of a crack network and improve the gas production rate.
According to the shale reservoir methane high-efficiency utilization and in-situ multistage shaped energy blasting fracturing method, in the shaped energy perforation stage, the specific type of a perforating gun is determined according to the on-site actual working condition, firstly, a shaped energy perforating device is conveyed to a section to be perforated through a continuous oil pipe, perforating operation is carried out on a shale reservoir in a horizontal well section, after one-time perforation is completed, the perforating device is taken out through the continuous oil pipe, after replacement of the perforating gun is completed, the incident hole device is lowered again, sectional perforating operation is continuously carried out on the shale reservoir in the horizontal well section according to a locator, and after 3-5 times of repeated perforating operation, the perforating device is taken out, so that a section to be blasted with a large length range is formed. When the packer and shale reservoir form a closed space, firstly, a three-way valve channel connected with the direction of an industrial air extractor at the left side is opened, the impurity gas in the closed space is pumped and discharged, the specific pumping and discharging time depends on the detection result of a methane concentration sensor, when the change of the methane concentration is not large by detection, the three-way valve channel at the left side and the industrial air extractor are closed, if the methane concentration in the closed space can not reach the ideal explosion concentration at the moment, the three-way valve channel connected with an air compressor at the upper side and a methane storage tank channel are opened, the methane extracted in situ is input into the closed space to obtain the ideal explosion concentration, then, the methane storage tank channel is closed, the combustion improver storage tank channel is opened, and the combustion improver is input into the closed space to form a methane-combustion improver mixture with the optimal explosion effect. The ideal methane explosion concentration can be selected differently according to different combustion improver types, the methane explosion limit is about 5% -15% in the air, in order to obtain larger explosion power, the combustion improver can be injected, for example, when pure oxygen is used as the combustion improver, the highest explosion limit of the methane can reach 61%, and then the combustion improver dosage for obtaining the optimal explosion effect is determined according to theoretical means.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (6)
1. A shale reservoir in-situ analysis methane high-efficiency utilization and multi-stage energy-gathering combustion and explosion fracturing method is characterized by comprising the following steps:
s1, constructing shale reservoir pore canals in a horizontal well;
s2, installing a packing device for the horizontal well;
The step S2 comprises the following steps:
the packer is put in a section to be fractured in a horizontal well through a coiled tubing, and the packer is fixed with the shale reservoir well wall;
An igniter, a methane concentration sensor and a coiled tubing head are fixedly arranged on one side of the sealing space of the sealing device; pumping or inputting gas into the closed space to be fractured through the coiled tubing head; the coiled tubing head is internally provided with a valve and penetrates through the packing device; the pressure bearing capacity of the packing device and the coiled tubing head is not lower than 200MPa;
s3, extracting gas from the closed space of the packing device;
The step S3 comprises the following steps:
Extracting gas from the closed space of the packing device based on an industrial air extractor to further analyze methane gas in an adsorption state in a shale reservoir fracture;
separating and analyzing the extracted gas into methane light hydrocarbon gas based on natural gas separation equipment, and storing the methane light hydrocarbon gas in a methane storage tank;
S4, putting a gaseous combustion improver into the closed space to form a gaseous combustion improver mixture;
When the concentration of methane reaches a proper explosion range, inputting a gaseous combustion improver into the closed space through a continuous oil pipe based on an air compressor to form a gaseous combustion improver mixture;
s5, performing ignition, explosion and fracturing on the gaseous combustion improver mixture to enable cracks in the well wall of the horizontal well to develop and penetrate;
s6, repeatedly executing S3-S5, and forming a highly complex and effective three-dimensional fracture network in the horizontal well.
2. The shale reservoir in-situ analytical methane efficient utilization and multistage energy-gathering explosive fracturing method according to claim 1, wherein S1 comprises:
And (3) conveying the shaped perforating device into the horizontal well through the continuous oil pipe, carrying out multi-section shaped perforating on the horizontal well, forming a plurality of three-dimensional pore channels on a shale reservoir layer of a well wall of the horizontal well to form a section to be fractured, extracting the shaped perforating device to the ground after the shaped perforating operation is completed, replacing the shaped perforating device again, conveying the shaped perforating device into the position in the horizontal well close to the last perforating operation by the continuous oil pipe again, and repeating the perforating operation for 3-5 times.
3. The shale reservoir in-situ analysis methane high-efficiency utilization and multi-stage shaped energy combustion explosion fracturing method according to claim 2, wherein the shaped energy perforating device comprises a perforating gun, a positioner and a positive tube device, the position of the perforating device is determined through the positioner, and the position of the gun muzzle of the perforating gun is adjusted through the positive tube device.
4. The shale reservoir in-situ analytical methane efficient utilization and multistage energy-gathering explosive fracturing method according to claim 1, wherein S4 comprises:
the methane concentration in the enclosed space is displayed based on the methane concentration sensor.
5. The efficient utilization and multistage energy-gathering blasting fracturing method for in-situ analysis of methane in shale reservoirs according to claim 4, wherein if the concentration of methane in the closed space does not reach a proper blasting condition, methane light hydrocarbon gas stored in a methane storage tank after ground separation is input into the closed space based on an air compressor until the optimal blasting concentration is reached.
6. The shale reservoir in-situ analytical methane efficient utilization and multistage energy-gathering explosive fracturing method according to claim 1, wherein S5 comprises:
And an igniter based on the sealing and insulating device ignites and burns the gaseous combustion improver mixture in the closed space, and detonation shock waves, high-pressure detonation gas and high-temperature effects generated by the burning and explosion are utilized to cooperatively impact the shale gas reservoir so as to promote crack development and penetration.
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