CN115182713B - Three-dimensional development method for explosive-tight cutting of shale reservoir three-dimensional horizontal well - Google Patents
Three-dimensional development method for explosive-tight cutting of shale reservoir three-dimensional horizontal well Download PDFInfo
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- 238000007789 sealing Methods 0.000 claims abstract description 32
- 238000005422 blasting Methods 0.000 claims abstract description 31
- 238000004880 explosion Methods 0.000 claims abstract description 28
- 238000011065 in-situ storage Methods 0.000 claims abstract description 26
- 238000010276 construction Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 72
- 238000000605 extraction Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 19
- 238000005553 drilling Methods 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 12
- 230000035939 shock Effects 0.000 claims description 8
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- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical group O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 4
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- 238000011084 recovery Methods 0.000 abstract description 5
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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
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
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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
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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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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Abstract
The application discloses a three-dimensional horizontal well explosive-explosion-dense-cutting three-dimensional development method for shale reservoirs, which comprises the steps of adopting a large-platform cluster well group operation mode, adopting three-dimensional horizontal well layout with large offset distance for each well, carrying out three-dimensional encryption on underground reservoirs in the transverse direction and the longitudinal direction, then adopting dense-cutting staged fracturing and methane in-situ multistage explosive-explosion fracturing for each well, wherein high-temperature high-pressure gas generated by primary explosive explosion is used for fracturing a stratum along a perforation tunnel, improving the hole depth, expanding the aperture and eliminating perforation compaction; and then after the staged sealing is completed later, the secondary blasting is continued to fracture the stratum of the perforation tunnel, the newly generated cracks are further extended, and a crack network which is formed by interweaving the main cracks of the perforation tunnel and the multistage blasting branch cracks is formed. The application can combine various fracturing technologies, thereby realizing three-dimensional development of shale reservoirs, improving the fracturing degree of single well reconstruction, reducing the construction flow and the cost and finally achieving the purpose of improving the utilization degree and the recovery ratio of the reservoirs.
Description
Technical Field
The application relates to an unconventional gas reservoir three-dimensional development method, in particular to a shale reservoir three-dimensional horizontal well blasting density cutting three-dimensional development method which is used during shale gas reservoir exploitation.
Background
Shale gas refers to natural gas which is endowed in shale or mudstone rich in organic matters capable of generating hydrocarbon and mainly exists in shale intervals in an adsorption and free mode, is self-generated and self-stored, and belongs to unconventional natural gas. Compared with the conventional pore or fractured reservoir, the shale reservoir has tiny pores and extremely low permeability, and the shale gas reservoir has commercial exploitation value after volume fracturing is generally required.
The current main fracturing yield-increasing technical means is that a slick water fracturing technology is combined with horizontal well sectional reconstruction, but the method faces the problems of high water resource consumption, pollution of fracturing fluid, single fracture network shape and the like. In recent years, expert scholars propose a methane in-situ blasting technical idea of utilizing methane gas which is analyzed in situ in a reservoir to impact and fracture a shale reservoir through high-temperature and high-pressure gas generated by blasting, so as to create a three-dimensional fracture network and provide an efficient migration channel for the shale gas. Based on the thought, a plurality of engineering method ideas are provided, the basic implementation steps of horizontal well full-section perforation, guiding slot construction, combustion improver feeding, ignition and explosion until multi-section multi-stage pulse explosion are carried out, innovation is carried out in three aspects of a horizontal well drilling mode, a combustion improver underground feeding mode and a multi-stage pulse explosion mode, and the method is essentially horizontal well multi-section clustered fracturing under the action of methane explosion.
However, the proposed in-situ multistage pulse energy-gathering explosive fracturing method for horizontal segmented methane of various shale reservoirs has certain problems: inventor(s):researches find that the conventional method is mostly based on a conventional two-dimensional horizontal well, and the wellhead and the horizontal section projection are basically on the same straight line, so that the application range of a reservoir is severely limited, the utilization degree of the reservoir is low, the application reserve is less, and the practical condition of shale gas resource development in China is not met; the construction cost of the horizontal well is 2-3 times of that of the vertical well, and whether the hydraulic fracturing well is constructed around the fracturing well or the blasting well is used for methane extraction of the fracture through well, the construction engineering quantity is increased, the period is prolonged, and the exploitation cost is high; in addition, the adding of the existing combustion improver needs to independently design process steps, so that the overall exploitation efficiency is affected, and the existing mature exploitation process is not well integrated; the fracturing process still depends in part on traditional hydraulic fracturing and supercritical CO 2 Sand carrying into the seam, etc., and pumping operation is frequent.
The main shale oil gas well in China is positioned in southwest mountainous areas, the surface fluctuation is large, the ecological environment is fragile, the water resource, the land resource and the forest resource protection areas are large, and the horizontal well development is greatly influenced by the topography and the resource protection; the current method also adopts horizontal well staged multi-cluster fracturing, which means that a packer is used for packing horizontal segments to be fractured with a certain length, and multi-cluster perforation fracturing is carried out in the segments to be fractured at a certain interval (cluster interval). After one-stage fracturing construction is finished, changing the setting position of the packer, and carrying out next-stage staged multi-cluster fracturing, so that the steps are repeated until all horizontal stages are staged multi-cluster fracturing; the dense cutting fracturing technology fully utilizes the effective reconstruction of crack induced stress fields among clusters by reducing the perforation cluster spacing and increasing the number of single-stage perforation clusters, so that the reserves of underreconstructed areas among clusters are effectively utilized, and the single-well control reserves (SRV) and the gas well estimated final recoverable reserves (EUR) are increased; the methods can play a certain role, but are not suitable for exploitation of shale gas reservoirs greatly influenced by topography and resource protection in horizontal well exploitation. In order to better realize the fracturing transformation of shale tight reservoirs, it is difficult to rely on a certain fracturing technical means, and various advanced drilling and completion, fracturing and extraction production technologies are required to be comprehensively applied. Therefore, how to combine various fracturing technologies can be applied, thereby realizing three-dimensional development of shale reservoirs, improving the fracturing degree of single well reconstruction, reducing the construction flow and the cost, and finally achieving the purpose of improving the utilization degree and the recovery ratio of the reservoirs, and being one of the research directions in the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a three-dimensional development method for the explosive-dense cutting of a three-dimensional horizontal well of a shale reservoir, which can combine multiple fracturing technologies, thereby realizing three-dimensional development of the shale reservoir, improving the fracturing degree of single well reconstruction, reducing the construction flow and cost, and finally achieving the purpose of improving the utilization degree and the recovery ratio of the reservoir.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows: a three-dimensional development method for the explosive-sealing cutting of a shale reservoir three-dimensional horizontal well comprises the following specific steps:
firstly, constructing a three-dimensional horizontal well on the ground to be extracted in a large offset way, thereby establishing a shale gas cluster well platform, arranging a plurality of wellheads in a double row manner, enabling the offset distance of each three-dimensional horizontal well to be 300-1500 m in a space three-dimensional well arrangement way, optimizing the section design of a well body, the structural design of the well body and the track design of a well hole by adopting the existing method, optimizing the deflecting point, the offset well oblique angle, the azimuth angle and the offset well section, effectively reducing friction and drag, and finally realizing the three-dimensional horizontal well arrangement with the large offset distance;
step two, after drilling work of the shale gas cluster well platform is completed, each three-dimensional horizontal well is put into a sleeve for well cementation, wherein the vertical section and the horizontal well section of each three-dimensional horizontal well, which are close to a well head, are sealed and reinforced by cement paste, cement rings are formed together after solidification, and the integrity and the tightness of the cement rings are ensured; after the last layer of casing is well cemented, the drilling machine is disassembled, a temporary wellhead is installed on the ground, then a workover rig and an oil pipe are used for injecting a mixture of water and gel, and a borehole is cleaned to prepare for perforation operation;
step three, firstly selecting a three-dimensional horizontal well, putting a perforating gun into the three-dimensional horizontal well from a wellhead, adopting a continuous oil pipe transmission mode to enable the perforating gun to move to the deep part of the three-dimensional horizontal well, utilizing a positioning sensor on the perforating gun to determine the position of the perforating gun in the three-dimensional horizontal well in real time, so that the perforating gun reaches the deepest position of the three-dimensional horizontal well in a shale reservoir, stopping the movement of the perforating gun at the moment, then starting a ground perforation control device, enabling the perforating gun to perform perforation construction to the periphery of the three-dimensional horizontal well at the current position to form multi-cluster perforation, enabling all perforation to penetrate through a cement ring and a sleeve to extend into the shale reservoir, enabling the shale reservoir to be communicated with the three-dimensional horizontal well, enabling part of shale gas in the shale reservoir to enter the three-dimensional horizontal well through perforation, taking out the perforating gun from the three-dimensional horizontal well, placing an igniter at the multi-cluster perforation position in the three-dimensional horizontal well, igniting the shale gas flowing out of the perforating position, and accordingly generating shale gas explosion at the current position, and carrying out high-temperature high-pressure gas and detonation shock wave, and carrying out shock crack on the inside and periphery of the three-dimensional horizontal well to enable all shale gas to perform perforation explosion and crack perforation hole wall to realize a methane in situ perforation process;
step four, taking out an igniter, and putting an assembled bridge plug-perforation combined tool string on the ground into a three-dimensional horizontal well which completes one-time in-situ methane blasting, wherein the bridge plug-perforation combined tool string consists of a bridge plug and a perforating gun, the bridge plug is fixed at the front end of the perforating gun through a connecting rod, combustion improver is filled in the bridge plug, when the bridge plug-perforation combined tool string approaches to a multi-cluster perforating position formed for the first time, the bridge plug is stopped moving and separated from the perforating gun, so that the bridge plug seals the three-dimensional horizontal well, a fracturing sealing section is formed between the bridge plug and the deepest part of the three-dimensional horizontal well, at the moment, a multi-cluster perforating hole formed for the first time is positioned in the fracturing sealing section, and shale gas in a shale reservoir enters the fracturing sealing section through multi-cluster perforating and is stored; meanwhile, constructing the separated perforating gun at a certain distance from the first formed multi-cluster perforating hole to form multi-cluster perforating hole, taking out the perforating gun, and placing an igniter at the position where the multi-cluster perforating hole is formed for the second time to ignite, so that an in-situ methane blasting process is realized at the position; taking out the igniter after completion, putting in the bridge plug-perforation combined tool string, repeating the steps, and carrying out primary in-situ methane blasting on the three-dimensional horizontal well section and sealing each section to store shale gas in each fracturing sealing section;
step five, after waiting for a period of time, a conventional oil pipe drill is extended into a three-dimensional horizontal well, a bridge plug closest to a wellhead is firstly drilled and ground, combustion improver in the bridge plug is released to a current fracturing sealing section, at the moment, the conventional oil pipe drill is taken out and put into an igniter for ignition, as the combustion improver is mixed with shale gas stored in the current pressure sealing section, gas explosion occurs after ignition, high-temperature and high-pressure gas and detonation shock waves generated by the gas explosion impact fracturing are carried out on the inside and surrounding shale of each perforation again, a plurality of cracks on the wall of each perforation hole are further developed and expanded, a secondary in-situ methane explosion process is realized, the igniter is taken out after completion and put into a conventional oil pipe drill again to grind off a bridge plug, the secondary in-situ methane explosion process is repeated until the multistage explosion process of all fracturing sealing sections of the three-dimensional horizontal well is completed, and a large number of cracks formed by fracturing and anti-reflection in the shale gas in the fracturing storage layer enter the three-dimensional horizontal well at the moment;
and step six, repeating the steps three to five times, thereby completing the fracturing transmission-increasing process of each three-dimensional horizontal well in the whole shale gas cluster well platform, and finally, communicating the wellhead of each three-dimensional horizontal well with a main pipeline through each extraction pipeline to extract shale gas.
Further, each extraction pipeline in the step six is respectively provided with a gas concentration monitor, if the methane concentration in any extraction pipeline is reduced to below 9%, the extraction pipeline is separated from the corresponding three-dimensional horizontal well, an igniter is extended into the three-dimensional horizontal well again to ignite, the blasting operation is implemented again, extraction is continued after completion, and if the extraction concentration is unchanged after implementation, the extraction of the three-dimensional horizontal well is stopped.
Further, the distance between the shower holes at two adjacent positions in the same three-dimensional horizontal well is 50-100 m; the number of perforation clusters at each position is 5-10 clusters.
Further, the combustion improver is pure oxygen.
Further, in the first step, 2-4 wellheads are distributed in each row, the interval between the wellheads in the same row is 4-6 m, and the row interval is 18-40 m.
Compared with the prior art, the application has the following advantages:
1) A large-platform cluster well group operation mode is adopted. The application can increase the number of platform well distribution according to the drilling technique capability and well spacing by drilling the single well field cluster well group, and the platform development mode has the characteristics of greatly reducing the occupied area, reducing the repeated investment of ground facilities, centralizing management and high operation efficiency, can effectively reduce the drilling and fracturing cost and improves the development and production speed of the oil and gas field.
2) And (3) three-dimensional development of a three-dimensional horizontal well. The application increases the movable reserve of the reservoir at the same layer, is suitable for exploiting reservoir resources among different layers, and can carry out three-dimensional encryption on the underground reservoir in the transverse direction and the longitudinal direction through the three-dimensional horizontal well layout with large offset distance, thereby realizing three-dimensional use among wells and layers.
3) The long horizontal well is closely cut and staged to be fractured. According to the method, the section spacing of the horizontal well fracturing sections and the cluster spacing of perforation clusters in each section are reduced, so that denser pore channels perpendicular to the horizontal well are formed, the transverse crack coverage rate of the well is improved, the seepage distance from fluid in a reservoir matrix to an artificial perforation crack is shortened, in-situ blasting is carried out on shale gas, the effective seepage volume is increased, and the recovery ratio is improved. The smaller cluster spacing also increases stress interference among the cracks, utilizes induced stress field interference formed around the crack wall and changes the in-situ stress state, promotes the steering, expanding and developing of the cracks, further increases the contact area of the crack network and the shale gas reservoir, and is beneficial to forming a complex crack network.
4) Methane in-situ multistage blasting main body cracking means. According to the application, the existing perforation seam making and a specific methane in-situ blasting technique are combined to realize the effect of primary blasting and fracturing, wherein high-temperature and high-pressure gas generated by primary blasting fractures the stratum along perforation tunnels, peak pressure acts on perforation holes, the hole depth is increased, the aperture is enlarged, and perforation compaction can be eliminated; then after the sectional sealing is completed subsequently, the shale gas desorbed in the shale reservoir is stored in each section in the three-dimensional horizontal well, at the moment, the bridge plugs at each section are drilled and ground to be removed, and the combustion improver (namely pure oxygen) in the bridge plugs is released into the sections to be mixed with the shale gas when the bridge plugs are removed, so that the condition of insufficient oxygen in the three-dimensional horizontal well caused by primary blasting can be supplemented, then the secondary blasting effect is realized by ignition, the secondary blasting continues to fracture the jet pore canal stratum, and new cracks are further extended to realize seam extension and seam expansion; and each section can realize the repeated action of multistage blasting on perforation holes and crack tips, so that a crack network is formed by interweaving main cracks of perforation tunnels and multistage blasting branch cracks. The staged multistage blasting method is different from the traditional hydraulic fracturing cracks, and the cracks formed by multistage blasting are difficult to close due to dislocation, so that seepage conditions of near-well zones are remarkably improved. The application can realize sectional multistage blasting without additionally arranging a gas pipeline by presetting the combustion improver in the bridge plug, so that the application can combine multiple fracturing technologies to realize three-dimensional development of shale reservoirs, improve the fracturing degree of single well reconstruction, reduce construction flow and cost and finally achieve the aim of improving the utilization degree and recovery ratio of the reservoirs.
Drawings
FIG. 1 is a schematic view of the overall structure of the present application;
FIG. 2 is a schematic diagram of a staged multi-cluster blasting fracturing operation in accordance with the present application;
fig. 3 is a schematic view of the bridge plug structure employed in the present application.
In the figure: 1-shale gas cluster well platform; 2-a three-dimensional horizontal well; 3-sleeve; 4-a coiled tubing; 5-bridge plug-perforation linkage tool string; 6-a cable; 7-an igniter; 8-bridge plug.
Detailed Description
The present application will be further described below.
As shown in fig. 1, the specific steps of the present application are:
constructing a three-dimensional horizontal well 2 on the ground to be extracted in a large offset manner, so as to establish a shale gas cluster well platform 1, wherein the well heads of the shale gas cluster well platform 1 are arranged in double rows, 2-4 well heads are arranged in each row, the interval between the well heads in the same row is 4-6 m, and the row interval is 18-40 m; the offset distance of each three-dimensional horizontal well 2 is 300-1500 meters in a space three-dimensional well arrangement mode, in order to ensure the offset distance of the three-dimensional horizontal well 2, the well section design, the well structure design and the well track design are optimized by adopting the existing method, and the deflecting point, the offset well oblique angle, the azimuth angle and the offset well section are optimized, so that friction and drag reduction are effectively reduced, and finally the three-dimensional horizontal well 2 with large offset distance is arranged;
step two, after the drilling work of the shale gas cluster well platform 1 is completed, each three-dimensional horizontal well 2 is put into a sleeve 3 for well cementation, wherein the vertical section and the horizontal well section of each three-dimensional horizontal well 2 close to a wellhead are sealed and reinforced by cement paste, and cement rings are formed together after solidification, so that the integrity and the tightness of the cement rings are ensured; after the last layer of casing 3 is well cemented, the drilling machine is disassembled, a temporary wellhead is installed on the ground, then a workover rig and an oil pipe are used for injecting a mixture of water and gel, and a borehole is cleaned to prepare for perforation operation;
step three, firstly selecting a three-dimensional horizontal well 2, putting a perforating gun into the three-dimensional horizontal well from a wellhead, adopting a continuous oil pipe 4 transmission mode to enable the perforating gun to move towards the deep part of the three-dimensional horizontal well 2, utilizing a positioning sensor on the perforating gun to determine the position of the perforating gun in the three-dimensional horizontal well 2 in real time, enabling the perforating gun to reach the deepest position of the three-dimensional horizontal well 2 in a shale reservoir layer, stopping the perforating gun to move at the moment, then starting a ground perforation control device, enabling the perforating gun to perform perforation construction to form multi-cluster perforation at the current position towards the periphery of the three-dimensional horizontal well, enabling all perforation holes to penetrate through a cement ring and a sleeve pipe 3 to penetrate into the shale reservoir layer, enabling the shale reservoir layer to be communicated with the three-dimensional horizontal well 2, enabling part of shale gas in the shale reservoir layer to enter the three-dimensional horizontal well 2 through perforation holes, taking out the perforating gun from the three-dimensional horizontal well 2, placing an igniter 7 at the multi-cluster position in the three-dimensional horizontal well 2, igniting the shale gas which is permeated out of the position of the perforating hole, enabling high-temperature high-pressure gas and detonation to occur at the current position, enabling the high-pressure gas explosion and detonation shock wave generated by the gas explosion to occur around the three-dimensional horizontal well, and enabling the perforation hole wall to be subjected to perform in situ methane explosion process;
step four, taking out an igniter 7, and putting the bridge plug-perforation combined tool string 5 assembled on the ground into a three-dimensional horizontal well which is subjected to primary in-situ methane blasting, wherein the bridge plug-perforation combined tool string consists of a bridge plug 8 and a perforating gun, the bridge plug 8 is fixed at the front end of the perforating gun through a connecting rod, combustion improver is filled in the bridge plug 8, the combustion improver is pure oxygen, when the bridge plug-perforation combined tool string 5 approaches to a multi-cluster perforation position formed for the first time, as shown in fig. 2, the movement is stopped, the bridge plug is separated from the perforating gun, the bridge plug 8 seals the three-dimensional horizontal well 2, a fracturing sealing section is formed between the bridge plug 8 and the deepest part of the three-dimensional horizontal well 2, a plurality of shower holes formed for the first time at the moment are positioned in the fracturing sealing section, and shale gas in the shale storage layer enters the fracturing sealing section through a plurality of clusters of perforation and is stored; meanwhile, the separated perforating gun is constructed at a certain distance from the multi-cluster perforating holes formed for the first time to form multi-cluster perforating holes, then the perforating gun is taken out, and an igniter 7 is placed at a position where the multi-cluster perforating holes are formed for the second time to ignite, so that an in-situ methane blasting process is realized at the position; after the completion, taking out the igniter 7, putting the igniter into the bridge plug-perforation combined tool string 5 again, repeating the steps, and carrying out primary in-situ methane blasting on the three-dimensional horizontal well section and sealing each section to store shale gas in each fracturing sealing section; the distance between the shower holes at two adjacent positions in the same three-dimensional horizontal well is 50-100 m; the number of perforation clusters at each position is 5-10 clusters.
Step five, after waiting for a period of time, a conventional oil pipe drill is extended into the three-dimensional horizontal well 2, the bridge plug 8 closest to a wellhead is firstly drilled and worn away, the combustion improver in the bridge plug 8 is released to the current fracturing sealing section, the conventional oil pipe drill is taken out and put into an igniter 7 for ignition, the combustion improver is mixed with shale gas stored in the current pressure sealing section, gas explosion occurs after ignition, high-temperature high-pressure gas and detonation shock waves generated by the gas explosion impact fracturing are carried out on shale inside and around each perforation hole again, a plurality of cracks on the perforation hole wall are further developed and expanded, a secondary in-situ methane explosion process is realized, the igniter 7 is taken out after completion and put into the conventional oil pipe drill again to drill away one bridge plug 8, and the secondary in-situ methane explosion process is repeated until the multi-stage explosion process of all the fracturing sealing sections of the three-dimensional horizontal well 2 is completed, and the shale gas in the reservoir at the moment enters into the three-dimensional horizontal well 2 in a large quantity through the fracturing and permeation process;
step six, repeating the steps three to five times, thereby completing the fracturing transmission-increasing process of each three-dimensional horizontal well 2 in the whole shale gas cluster well platform 1, and finally, communicating the wellhead of each three-dimensional horizontal well 2 with a main pipeline through each extraction pipeline to extract shale gas; and in the extraction process, if the methane concentration in any extraction pipeline is reduced to below 9%, separating the extraction pipeline from the corresponding three-dimensional horizontal well 2, extending the igniter 7 into the three-dimensional horizontal well 2 again to ignite, performing blasting operation again, continuing extraction after completion, and stopping extraction of the three-dimensional horizontal well 2 if the extraction concentration is unchanged after implementation.
The gas concentration monitor, workover rig, drilling machine, perforating gun, igniter 7, bridge plug-perforating combined tool string 5 and conventional oil pipe drill are all existing equipment and can be purchased through markets, as shown in fig. 3, wherein the bridge plug 8 adopted by the application is different from the existing bridge plug in structure only in that a cavity (namely a combustion improver cabin) is arranged in the bridge plug for placing combustion improver, and other structures are the same as the existing structures, so that the bridge plug can be realized only by additionally arranging the cavity in the existing bridge plug main body, and the bridge plug is convenient to acquire and smoothly realize subsequent drilling and grinding work.
The foregoing is only a preferred embodiment of the application, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the application.
Claims (5)
1. A three-dimensional development method for explosive-sealing cutting of a shale reservoir three-dimensional horizontal well is characterized by comprising the following specific steps:
constructing a three-dimensional horizontal well on the ground to be extracted in a large offset mode, so as to establish a shale gas cluster well platform, wherein the well heads of the shale gas cluster well platform are arranged in double rows, a plurality of well heads are arranged in each row, and the offset of each three-dimensional horizontal well is 300-1500 m in a space three-dimensional well arrangement mode;
step two, after drilling work of the shale gas cluster well platform is completed, each three-dimensional horizontal well is put into a sleeve for well cementation, wherein the vertical section and the horizontal well section of each three-dimensional horizontal well, which are close to a well head, are sealed and reinforced by cement paste, cement rings are formed together after solidification, and the integrity and the tightness of the cement rings are ensured; after the last layer of casing is well cemented, the drilling machine is disassembled, a temporary wellhead is installed on the ground, then a workover rig and an oil pipe are used for injecting a mixture of water and gel, and a borehole is cleaned to prepare for perforation operation;
step three, firstly selecting a three-dimensional horizontal well, putting a perforating gun into the three-dimensional horizontal well from a wellhead, adopting a continuous oil pipe transmission mode to enable the perforating gun to move to the deep part of the three-dimensional horizontal well, utilizing a positioning sensor on the perforating gun to determine the position of the perforating gun in the three-dimensional horizontal well in real time, so that the perforating gun reaches the deepest position of the three-dimensional horizontal well in a shale reservoir, stopping the movement of the perforating gun at the moment, then starting a ground perforation control device, enabling the perforating gun to perform perforation construction to the periphery of the three-dimensional horizontal well at the current position to form multi-cluster perforation, enabling all perforation to penetrate through a cement ring and a sleeve to extend into the shale reservoir, enabling the shale reservoir to be communicated with the three-dimensional horizontal well, enabling part of shale gas in the shale reservoir to enter the three-dimensional horizontal well through perforation, taking out the perforating gun from the three-dimensional horizontal well, placing an igniter at the multi-cluster perforation position in the three-dimensional horizontal well, igniting the shale gas flowing out of the perforating position, and accordingly generating shale gas explosion at the current position, and carrying out high-temperature high-pressure gas and detonation shock wave, and carrying out shock crack on the inside and periphery of the three-dimensional horizontal well to enable all shale gas to perform perforation explosion and crack perforation hole wall to realize a methane in situ perforation process;
step four, taking out an igniter, and putting an assembled bridge plug-perforation combined tool string on the ground into a three-dimensional horizontal well which completes one-time in-situ methane blasting, wherein the bridge plug-perforation combined tool string consists of a bridge plug and a perforating gun, the bridge plug is fixed at the front end of the perforating gun through a connecting rod, combustion improver is filled in the bridge plug, when the bridge plug-perforation combined tool string approaches to a multi-cluster perforating position formed for the first time, the bridge plug is stopped moving and separated from the perforating gun, so that the bridge plug seals the three-dimensional horizontal well, a fracturing sealing section is formed between the bridge plug and the deepest part of the three-dimensional horizontal well, at the moment, a multi-cluster perforating hole formed for the first time is positioned in the fracturing sealing section, and shale gas in a shale reservoir enters the fracturing sealing section through multi-cluster perforating and is stored; meanwhile, constructing the separated perforating gun at a certain distance from the first formed multi-cluster perforating hole to form multi-cluster perforating hole, taking out the perforating gun, and placing an igniter at the position where the multi-cluster perforating hole is formed for the second time to ignite, so that an in-situ methane blasting process is realized at the position; taking out the igniter after completion, putting in the bridge plug-perforation combined tool string, repeating the steps, and carrying out primary in-situ methane blasting on the three-dimensional horizontal well section and sealing each section to store shale gas in each fracturing sealing section;
step five, after waiting for a period of time, a conventional oil pipe drill is extended into a three-dimensional horizontal well, a bridge plug closest to a wellhead is firstly drilled and ground, combustion improver in the bridge plug is released to a current fracturing sealing section, at the moment, the conventional oil pipe drill is taken out and put into an igniter for ignition, as the combustion improver is mixed with shale gas stored in the current pressure sealing section, gas explosion occurs after ignition, high-temperature and high-pressure gas and detonation shock waves generated by the gas explosion impact fracturing are carried out on the inside and surrounding shale of each perforation again, a plurality of cracks on the wall of each perforation hole are further developed and expanded, a secondary in-situ methane explosion process is realized, the igniter is taken out after completion and put into a conventional oil pipe drill again to grind off a bridge plug, the secondary in-situ methane explosion process is repeated until the multistage explosion process of all fracturing sealing sections of the three-dimensional horizontal well is completed, and a large number of cracks formed by fracturing and anti-reflection in the shale gas in the fracturing storage layer enter the three-dimensional horizontal well at the moment;
and step six, repeating the steps three to five times, thereby completing the fracturing transmission-increasing process of each three-dimensional horizontal well in the whole shale gas cluster well platform, and finally, communicating the wellhead of each three-dimensional horizontal well with a main pipeline through each extraction pipeline to extract shale gas.
2. The method for three-dimensional horizontal well explosive-sealing and cutting three-dimensional development of the shale reservoir according to claim 1, wherein a gas concentration monitor is respectively arranged on each extraction pipeline in the step six, if the methane concentration in any extraction pipeline is reduced to be less than 9%, the extraction pipeline is separated from the corresponding three-dimensional horizontal well, an igniter is stretched into the three-dimensional horizontal well again for ignition, the explosive-sealing operation is implemented again, extraction is continued after completion, and if the post-implementation extraction concentration is unchanged, the extraction of the three-dimensional horizontal well is stopped.
3. The method for three-dimensional horizontal well explosive-sealing and cutting three-dimensional development of shale reservoirs according to claim 1, wherein the distance between the multi-cluster jet holes at two adjacent positions in the same three-dimensional horizontal well is 50-100 m; the number of perforation clusters at each position is 5-10 clusters.
4. The method for three-dimensional horizontal well explosive-dense cutting three-dimensional development of shale reservoirs of claim 1, wherein the combustion improver is pure oxygen.
5. The method for three-dimensional horizontal well explosive-sealing and cutting three-dimensional development of shale reservoirs according to claim 1, wherein 2-4 wellheads are distributed in each row in the first step, the interval between the wellheads in the same row is 4-6 m, and the row interval is 18-40 m.
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