CN113847001B - Penetration-variable shower hole gun suitable for staged fracturing of horizontal well and application method thereof - Google Patents
Penetration-variable shower hole gun suitable for staged fracturing of horizontal well and application method thereof Download PDFInfo
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- CN113847001B CN113847001B CN202010601515.2A CN202010601515A CN113847001B CN 113847001 B CN113847001 B CN 113847001B CN 202010601515 A CN202010601515 A CN 202010601515A CN 113847001 B CN113847001 B CN 113847001B
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- 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
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
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- 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
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
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- 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
Abstract
The invention provides a perforating gun capable of changing penetration depth and clustering suitable for staged fracturing of a horizontal well and an application method thereof, wherein the perforating gun comprises the following components: the gun comprises a gun head, a gun tail, a gun body, a cartridge clip and perforating bullets, wherein the gun head and the gun tail are respectively connected to two ends of the gun body, the cartridge clip is arranged in the gun body, and the cartridge clip is used for installing a plurality of perforating bullets; the perforation penetration of the plurality of charges gradually decreases in the direction from the tail to the head. According to the invention, by distinguishing the types of perforating charges arranged in each cluster of a section of perforating gun, perforating charge penetration depth is from large to small from a b target point to an a target point, and opening pressure of cracks of each cluster of perforating holes is from large to small, so that different perforating depths of each cluster of perforating holes in a section can be realized, uniform cracking and extension of each cluster of perforating holes in the section are facilitated, and staged fracturing reconstruction volume of a horizontal well is greatly improved. In addition, the arrangement of the perforating bullets in each cluster is different from the traditional arrangement according to the phase, the perforating bullets are arranged according to the plane perforation, and every two or three perforating bullet sections are shot in the same plane, so that the formation and the extension of cracks in the clusters are facilitated.
Description
Technical Field
The invention relates to the technical field of horizontal well fracturing, in particular to a penetration depth-variable shower hole gun suitable for staged fracturing of a horizontal well and an application method thereof.
Background
At present, the horizontal well staged multi-cluster fracturing technology is widely applied to hypotonic and compact hydrocarbon reservoirs with different lithologies (sandstone, carbonate rock, shale, coal seam and the like), and achieves remarkable yield increasing effect, so that the economic and effective development of the hydrocarbon reservoirs is realized. However, there are serious problems at the same time. With the continuous increase of the number of perforation clusters, the number of clusters in a section gradually rises from the previous 2-3 clusters to 4-6 clusters and even 6-9 clusters, and although the number of clusters is obviously increased, part of the clusters cannot be pressed open, and even if all the perforation clusters are pressed open, it is difficult to ensure that all the perforation clusters can open cracks and can extend uniformly. In addition, a large amount of data at home and abroad prove that the heterogeneous extension condition of cracks during multi-cluster fracturing is very common from different aspects. Taking 6 clusters of fracturing in a section as an example, the proportion of fracturing fluid and propping agent absorbed by each cluster of cracks can be more than 10 times different, and the closer to the perforation cluster of a target point of the horizontal well a, the greater the crack extension degree is. This non-uniform extension of multi-cluster cracks within a segment becomes more severe as the number of clusters within a segment increases.
In the past, in order to increase the uniform extension degree of cracks, a method of throwing temporary plugging balls is generally adopted, but the density of the temporary plugging balls is generally 1.7g/cm at present 3 Due to the density of the temporary plugging balls and the density of the ball feeding liquid (generally 1.01g/cm 3 ) The difference is large, so that the flow following property of the temporary plugging ball and the ball feeding liquid is relatively poor, most of the temporary plugging ball is plugged at the perforation cracks close to the b target point, and the cracks near the a target point which are required to be plugged most have extremely low plugging efficiency. In addition, even if most of holes at the crack of a certain cluster are blocked, the injection holes at the top of the horizontal shaft are difficult to be blocked due to the high density of temporary blocking balls, at the moment, the fracturing fluid still absorbs the fracturing fluid and propping agent at the crack of the perforation cluster to be blocked, if the extension pressure difference among the cracks of each cluster is large, the fracturing fluid is absorbed by the fracturing fluidThe fewer unblocked perforations may still absorb a greater proportion of the fracturing fluid and proppant. In other words, conventional temporary plugging ball techniques also present a number of uncertainties in promoting uniform elongation of multi-cluster fractures.
Therefore, a new technology for promoting the uniform extension of multi-cluster cracks in a segment needs to be researched and proposed to solve the limitation of the problems.
Disclosure of Invention
The invention aims to provide a penetration depth-variable shower hole gun suitable for staged fracturing of a horizontal well and an application method thereof, which realize penetration depth-variable shower hole operation of multiple clusters in the staged fracturing of the horizontal well, can realize uniform extension of crack joint networks of all clusters, improve the reconstruction volume of staged fracturing reconstruction of the horizontal well, improve the fracturing operation efficiency of the horizontal well, reduce the development cost and improve the staged fracturing development effect of the horizontal well.
In order to achieve the above object, the present invention provides a penetration depth-variable shower hole gun suitable for staged fracturing of a horizontal well, comprising: the gun comprises a gun head, a gun tail, a gun body, a cartridge clip and perforating bullets, wherein the gun head and the gun tail are respectively connected to two ends of the gun body, the cartridge clip is arranged in the gun body, and the cartridge clip is used for installing a plurality of perforating bullets;
wherein the perforation penetration depth of the plurality of perforating charges gradually decreases along the direction from the gun tail to the gun head.
In a preferred embodiment, the cartridge clip is configured such that a plurality of charges mounted thereon are fired toward the same point.
In a preferred embodiment, the cartridge holder is configured such that the firing directions of the plurality of charges mounted thereon are fired along different radial directions of the cartridge holder.
The invention also provides an application method of the penetration depth-variable shower hole gun suitable for staged fracturing of the horizontal well, which comprises the following steps:
(1) Evaluating reservoir parameters of the horizontal well;
(2) Determining a partial pressure layer section and determining the shower hole parameters of each section;
(3) Designing parameters of each cluster perforating gun according to parameters of each cluster perforation of each section of the cluster;
(4) And processing, assembling and testing each cluster of perforating guns.
In a preferred embodiment, in step (3), perforating parameter optimization simulation software is applied to build a perforating charge model, and simultaneously, using test data, a history fit of perforation depth or perforation initiation is performed, thereby determining parameters of each cluster of perforating charges for each interval.
In a preferred embodiment, in step (4), processing and manufacturing of each cluster of perforating charges of each layer section of the horizontal well are performed according to the determined parameters of each cluster of perforating charges, and processing, assembling, testing and marking are performed on the perforating gun of each layer section according to the requirements of each layer section.
In a preferred embodiment, in the step (4), the perforating gun is loaded on the ground, then the loading gun is connected into a well, and when the pipe column is lowered to the position near the expected layer section, the pipe column is calibrated deep, a bridge plug is set, the perforating holes are clustered, and then the perforating gun is lifted out for fracturing construction; repeating the procedure again to carry out the fracturing construction of the next layer of stratum.
In a preferred embodiment, in step (4), the parameters of each of the charges of the different intervals are the same or different and each match the perforation parameter results.
In a preferred embodiment, in step (4), the loading of each of the charges in the different intervals is the same or different and each meets the cluster optimization parameter results.
In a preferred embodiment, in step (4), a delayed firing technique is employed such that the firing times of the charges of the individual clusters of perforating guns in each interval are different.
The invention has the beneficial effects that: according to the invention, by distinguishing the types of perforating charges arranged in each cluster of a section of perforating gun, perforating charge penetration depth is from large to small from a b target point to an a target point, and opening pressure of cracks of each cluster of perforating holes is from large to small, so that different perforating depths of each cluster of perforating holes in a section can be realized, uniform cracking and extension of each cluster of perforating holes in the section are facilitated, and staged fracturing reconstruction volume of a horizontal well is greatly improved. In addition, the arrangement of the perforating bullets in each cluster is different from the traditional arrangement according to the phase, the perforating bullets are arranged according to the plane perforation, and every two or three perforating bullet sections are shot in the same plane, so that the formation and the extension of cracks in the clusters are facilitated. The principle of the invention is clear, the perforating gun is custom-manufactured and assembled, the perforating construction completely meets the requirement of fracturing optimization design, and the fracturing development effect of the horizontal well is improved.
Drawings
FIG. 1 is a schematic diagram of a horizontal well staged fracturing perforation cluster;
FIG. 2 is a schematic view of three cluster deep penetration within a segment;
FIG. 3 is a schematic view of a perforating cartridge holder configured to mount different perforating charges;
FIG. 4 is a schematic illustration of a perforating gun configuration with different charges installed;
FIG. 5 is a schematic view of three charges in the same direction
FIG. 6A is a schematic illustration of a crack non-uniform propagation phenomenon using a conventional 6-shower hole approach;
FIG. 6B is another schematic illustration of a crack non-uniform propagation phenomenon using a conventional 6-shower hole approach;
FIG. 7A is a schematic illustration of the crack propagation uniformity phenomenon for a variable depth cluster perforation employing the present invention;
FIG. 7B is another schematic illustration of the crack propagation uniformity phenomenon for a variable depth cluster perforation employing the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
First, the inventive concept of the present invention needs to be briefly described, and the following is specific:
from the standpoint of the difference in fracture pressure, the invention aims to promote uniform extension of the multi-shower hole cracks in the segment. However, in the prior art, the extent of the crack in the segment from the a target to the b target varies substantially from large to small. Since the fracture is a precondition of fracture extension, if the fracture pressure of each cluster of the fracture in the segment is scientifically and effectively adjusted from the perforation angle, the fracture pressure of each cluster of the perforation in the segment is changed according to the opposite rule, that is, the fracture pressure of each cluster of the perforation from the b target point to the a target point is changed from large to small, and then the uniform extension of each cluster of the perforation can be basically realized (see fig. 1). In fig. 1, a horizontal wellbore is perforated with a plurality of perforation clusters 1', 2', 3' and the perforations are clustered by a set bridge plug.
From the rule of influence of perforation parameters on fracture pressure, the factor which can basically change and has a large influence on the fracture pressure at present is perforation penetration depth. For simplicity, it is assumed that parameters such as a phase angle, hole density, aperture and the like of the perforation are unchanged, and only perforation penetration depth is considered to be changed. Different indoor test results also prove that the perforation penetration depth has a larger influence on the initiation and propagation of the guided fracture. The greater the penetration, the less the fracture initiation and extension pressure. However, in order to promote uniform extension of the perforation cracks between clusters in the segment, the difference in fracture pressure between the perforation cracks between clusters should have a certain magnitude, and ideally the difference in fracture pressure between adjacent perforation cluster cracks in the segment should be more than 1Mpa (see fig. 2).
In order to achieve the above inventive concept, the present invention provides a variable penetration depth shower perforating gun suitable for staged fracturing of a horizontal well, as shown in fig. 3 to 5, the perforating gun mainly comprising: the gun comprises a gun tail 1, a gun body 2, a cartridge clip 3, perforating charges 4 and a gun head 5, wherein the gun tail 1 and the gun head 5 are respectively connected to two ends of the gun body 2, and particularly can adopt detachable or non-detachable connection modes such as threaded connection and the like. The gun body 2 is internally provided with a cartridge clip 3 for mounting perforating bullets 4 with different sizes. In one embodiment, the cartridge holder 4 is provided with three projectile holes, and the number of the three different perforating charges can be the same or different. Moreover, the penetration depth of each perforation charge is distributed from large to small as required, and in particular, the perforation charges with large penetration depths are close to the gun tail 1.
Referring to fig. 3, in a preferred embodiment, the number of shot holes is 3, and the axial directions of the shot holes are not parallel to each other, which is advantageous for forming cracks in different radial directions of the horizontal well bore after perforation.
Referring again to fig. 5, in another preferred embodiment, the number of shot holes is 3 and each shot is arranged to be fired to the same target, i.e., the axes of each shot hole intersect at a point, which facilitates initiation and extension of the fracture after perforation.
In a specific embodiment, the gun type and the perforating bullet design of each cluster of perforation are designed and installed according to the rule that the penetration depth gradually increases from the a target to the b target, for example, 89 gun perforation is selected, and perforating guns are respectively configured as DP36RDX25, DP38RDX29 and BH36RDX33 in perforation clusters 1', 2', 3', so that the penetration depths of the perforation clusters 1', 2', 3' are different, and the opening pressure has a pressure gradient.
The invention also provides an application method of the penetration depth-variable shower hole gun suitable for staged fracturing of the horizontal well, which mainly comprises the following steps:
(1) Evaluating reservoir parameters for horizontal wells
The evaluation content comprises longitudinal and transverse spreading characteristics, lithology, all-rock mineral components, physical properties, rock mechanical parameters, three-dimensional ground stress characteristics, natural fracture states, spatial distribution, temperature, pressure and the like of the horizontal well reservoir. The method can be comprehensively applied to the determination of methods such as earthquake, logging, core indoor test and the like.
(2) Determining the partial pressure layer section and determining the shower hole parameters of each section
For the development of the horizontal well, the horizontal well section is longer, and the construction is generally carried out by adopting a pumping bridge plug shower hole fracturing combined operation mode. Under the condition, gradient distribution is presented along the borehole track along the pressure distribution of the horizontal well section, the pressure at the perforation positions of each cluster from the a target point to the b target point is changed from big to small, the formation opening pressure of each perforation cluster is simulated according to the calculation result, and the opening pressure and the extension pressure of each cluster are consistent with the borehole fracturing gradient data through calculating the formation stress and optimizing the perforation parameters, so that the perforation parameter requirements at each perforation position are obtained.
(3) Parameter design for perforating gun
Based on the step (2), the conventional perforation parameter optimization simulation software is applied to build a fine perforating bullet model, and particularly the size, perforation depth and perforation arrangement mode of the perforating bullets are clearly described. Meanwhile, historical fitting of perforation depth, perforation initiation and the like is carried out by using available test data, so that key parameter information such as the size of each cluster of perforating charges in each layer section, the arrangement mode of perforating passes and the like is determined.
(4) Processing, assembling and testing perforating gun
And (3) processing and manufacturing each section of each cluster of perforating charges of the horizontal well according to the parameters of the perforating charges determined in the step (3), assembling each section of perforating gun, and marking (e.g. programming numbers) to be consistent with each section in the fracturing design. And (3) after the manufactured perforating guns of all sections are detected, transporting the perforating guns to a construction site, and sequentially entering a well for perforation and fracturing operation according to a construction sequence.
Loading the perforating gun according to the design on the ground according to the design requirement, then loading the gun and connecting the gun into a well, lowering the tubular column to the position near the designed depth, correcting the depth of the tubular column, setting a bridge plug, clustering the perforating holes, and starting the perforating gun to perform fracturing construction; repeating the procedure again to carry out the next stage of fracturing construction. The perforating charges of each section of perforating gun are installed according to different requirements of each section, and the perforating charges with different numbers and different penetration depths are matched for gun loading. In order to ensure construction quality, the cartridge clip and the gun body of each section of perforating gun are inspected and numbered in a factory, and the perforating charges and the perforating gun are assembled on site according to design requirements. Although the partial workload of preparing perforating equipment is increased, the perforating can be ensured to meet the fracturing design requirement to the greatest extent, uniform complex fracturing cracks can be generated, the fracturing volume is increased, and the fracturing effect is improved.
On conventional perforating tools, each cluster of perforating charges employs the same specification of perforating charges, such as 89 gun configuration 90 charges. If the penetration depth is substantially equivalent to the conventional penetration depth, the bullet and the like are maintained substantially as they are. If the required penetration depth is lower than the prior art, the loading of the perforating charges is properly reduced, and if the required penetration depth is higher than the prior art, the loading of the perforating charges is properly increased, and finally, the purpose is that the cracks of the perforation clusters present different opening pressures. If the same explosive is adopted as the perforating charges, the volumes of the perforating charges are the same, but the perforating gun is different from the prior perforating charges in design and arrangement, the adjacent perforating charges can be adjusted in spatial arrangement, so that the perforating directions are all toward the same point on the sleeve. To avoid simultaneous firing of charges, a delayed firing technique may be used where the second charge fires again within a few seconds after the first firing hole fires. The penetration trajectory of the second charge will move substantially along one charge and continue to penetrate at the penetration end of the first charge, thereby greatly extending the original penetration depth.
In addition, in order to facilitate smooth entry and exit of the perforation tool string into and from the horizontal well bore, the entire perforation tool string should be within 8m, so that even if there are 16 perforation clusters within a segment, each perforation cluster can be 0.3m in length.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention is applied to a certain normal pressure shale gas well in southeast of Sichuan. The well fracturing design adopts a 'few-section multi-cluster' idea, each fracturing section adopts 5-7 clusters of perforations, and the phenomenon of uneven expansion of cracks of the well fracturing is predicted according to the conventional multi-cluster fracturing practice. Therefore, a penetration depth shower hole system is designed. The 89 guns are matched with 90 bullets in different bullet types, and firstly, the drug loading corresponding to the minimum penetration depth which can reach the design requirement of fracturing and the drug loading required by increasing the unit penetration depth are determined through experiments. According to the experimental result, the reservoir rock mechanical parameter and the ground stress parameter, designing a 5-cluster loading ratio as 1:1.6:2.1:2.6:3.2; the 6 cluster charge ratio was 1:1.6:2.1:2.6:3.2:3.7; the 7 cluster charge ratio was 1:1.6:2.1:2.6:3.2:3.7:4.1.
microseism monitoring and post-pressure inversion find that the similar and equal-depth wells adopt a conventional 6-cluster perforation mode, the uneven expansion phenomenon of cracks is obvious (shown in figure 6), and the wells adopt a penetration-depth cluster perforation mode, and the even expansion phenomenon of the cracks is obvious (shown in figure 7). By using the perforating gun and the application method of the invention, each shower hole in the section is uniformly cracked and extended, and finally, the complex fracture network volume is formed, and the staged fracturing reconstruction volume of the horizontal well is greatly improved.
In summary, the beneficial effects of the invention are as follows: according to the invention, by distinguishing the types of perforating charges arranged in each cluster of a section of perforating gun, perforating charge penetration depth is from large to small from a b target point to an a target point, and opening pressure of cracks of each cluster of perforating holes is from large to small, so that different perforating depths of each cluster of perforating holes in a section can be realized, uniform cracking and extension of each cluster of perforating holes in the section are facilitated, and staged fracturing reconstruction volume of a horizontal well is greatly improved. In addition, the arrangement of the perforating bullets in each cluster is different from the traditional arrangement according to the phase, the perforating bullets are arranged according to the plane perforation, and every two or three perforating bullet sections are shot in the same plane, so that the formation and the extension of cracks in the clusters are facilitated. The principle of the invention is clear, the perforating gun is custom-manufactured and assembled, the perforating construction completely meets the requirement of fracturing optimization design, and the fracturing development effect of the horizontal well is improved.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (9)
1. An application method of a variable-penetration shower gun suitable for staged fracturing of a horizontal well is characterized in that the variable-penetration shower gun comprises the following steps: the gun comprises a gun head, a gun tail, a gun body, a cartridge clip and perforating bullets, wherein the gun head and the gun tail are respectively connected to two ends of the gun body, the cartridge clip is arranged inside the gun body and is used for installing the perforating bullets, and the application method comprises the following steps:
(1) Evaluating reservoir parameters of the horizontal well;
(2) Determining a partial pressure layer section and determining the shower hole parameters of each section;
(3) Designing parameters of each cluster of perforating guns according to the parameters of each cluster of perforating holes of each section;
(4) And processing, assembling and testing the perforating gun.
2. The method of claim 1, wherein in step (3), perforating parameter optimization simulation software is applied to build a perforating charge model, and simultaneously, using test data, a history fit of perforation depth or perforation initiation is performed to determine parameters of each cluster of perforating charges for each interval.
3. The method of claim 1, wherein in step (4) the perforating guns of each layer section of the horizontal well are processed, assembled, tested and marked according to the requirements of each layer section by processing and manufacturing each group of perforating charges of each layer section of the horizontal well according to the determined parameters of each group of perforating charges.
4. The application method according to claim 1, wherein in the step (4), the perforating gun is loaded on the ground, then the loading gun is connected into the well, the string is calibrated deep, the bridge plug is set, the perforation is clustered, and then the perforating gun is lifted out for fracturing construction when the string is lowered to the vicinity of the position of the expected interval; and (5) repeating the fracturing construction procedure in the step (4) again to carry out fracturing construction of the next layer of stratum.
5. The method of claim 1, wherein in step (4) the parameters of each charge of different intervals are the same or different and each match the perforation parameter results.
6. The method of claim 1, wherein in step (4) the loading of each charge of different intervals is the same or different and each meets the cluster optimization parameter results.
7. The method of any one of claims 1-6, wherein in step (4), the firing delay technique is used to cause the firing times of the charges of the clusters of perforating guns to be different in each interval.
8. The method of claim 1, wherein the cartridge clip is configured such that a plurality of charges mounted thereon are fired toward the same point.
9. The method of claim 1, wherein the cartridge clip is configured such that firing directions of a plurality of charges mounted thereon are fired along different radial directions of the cartridge clip.
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| US3636590A (en) * | 1968-04-25 | 1972-01-25 | Saint Gobain | Means for preventing the adhesion of mineral fibers to the walls thereof of a forming chamber |
| CN109339855A (en) * | 2018-11-27 | 2019-02-15 | 中煤科工集团西安研究院有限公司 | Continuous pipe perforation staged fracturing method in coal mine gas extraction jumping chisel hole sleeve |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0425203D0 (en) * | 2004-11-16 | 2004-12-15 | Qinetiq Ltd | Improvements in and relating to oil well perforators |
| CN201080818Y (en) * | 2007-09-17 | 2008-07-02 | 西安集益石油技术有限公司 | Down-hole heat energy chemical reservoir perforating and fracturing device |
| CN201391292Y (en) * | 2009-04-02 | 2010-01-27 | 西安近代化学研究所 | Integral perforation device |
| CN104358549B (en) * | 2014-11-14 | 2017-02-22 | 山东北方民爆器材有限公司 | Perforated face oriented perforator for oil and gas wells |
| CN109958416B (en) * | 2017-12-22 | 2022-01-11 | 中国石油化工股份有限公司 | Multi-cluster perforation fracturing method for uniformly feeding liquid and sand with variable aperture and variable pore density |
| CN110005380B (en) * | 2019-04-11 | 2020-08-11 | 中国石油大学(北京) | Heterogeneous shale heterogeneous clustering perforation optimization method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3636590A (en) * | 1968-04-25 | 1972-01-25 | Saint Gobain | Means for preventing the adhesion of mineral fibers to the walls thereof of a forming chamber |
| CN109339855A (en) * | 2018-11-27 | 2019-02-15 | 中煤科工集团西安研究院有限公司 | Continuous pipe perforation staged fracturing method in coal mine gas extraction jumping chisel hole sleeve |
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