CN113898330B - Methane in-situ perforation, blasting and fracturing integrated device and method for open hole section of horizontal well - Google Patents
Methane in-situ perforation, blasting and fracturing integrated device and method for open hole section of horizontal well Download PDFInfo
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- CN113898330B CN113898330B CN202111197430.3A CN202111197430A CN113898330B CN 113898330 B CN113898330 B CN 113898330B CN 202111197430 A CN202111197430 A CN 202111197430A CN 113898330 B CN113898330 B CN 113898330B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 238000005422 blasting Methods 0.000 title claims abstract description 65
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004880 explosion Methods 0.000 claims abstract description 74
- 239000007789 gas Substances 0.000 claims description 134
- 238000002485 combustion reaction Methods 0.000 claims description 87
- 238000005086 pumping Methods 0.000 claims description 33
- 238000003860 storage Methods 0.000 claims description 27
- 238000007599 discharging Methods 0.000 claims description 21
- 239000002360 explosive Substances 0.000 claims description 18
- 238000005474 detonation Methods 0.000 claims description 17
- 239000002912 waste gas Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 3
- GXDVEXJTVGRLNW-UHFFFAOYSA-N [Cr].[Cu] Chemical compound [Cr].[Cu] GXDVEXJTVGRLNW-UHFFFAOYSA-N 0.000 claims description 3
- 239000000788 chromium alloy Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- YCKOAAUKSGOOJH-UHFFFAOYSA-N copper silver Chemical compound [Cu].[Ag].[Ag] YCKOAAUKSGOOJH-UHFFFAOYSA-N 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000009933 burial Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000758 substrate Substances 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
-
- 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
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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 relates to an in-situ perforation, explosion and fracturing integrated device and method for methane in a naked eye section of a horizontal well. According to the invention, multistage repeated fracturing operation of the fracturing section is completed under the condition of not moving the tubular column, after fracturing of the fracturing section is completed, the fracturing equipment withdraws from the shaft, the perforating bullet is reinstalled, the process is repeated in the next fracturing section, and staged blasting fracturing of the horizontal well is realized, so that a larger-scale diversion fracture network is obtained, and efficient exploitation of shale gas is realized.
Description
Technical Field
The invention relates to an in-situ perforation, explosion and fracturing integrated device and method for methane in a horizontal well open hole section, which are suitable for reservoirs such as complex dense gas, shale gas and the like, and belong to the technical field of explosion and fracturing.
Background
The national oil gas resource evaluation results show that China has quite abundant unconventional oil gas resources such as compact gas, shale gas and the like. Due to the limitation of technology and cost, the development progress of exploration and development is slow until in recent years, with the progress of large-scale hydraulic fracturing reconstruction technology and large-scale application, the development of low-pore low-permeability reservoirs such as dense gas, shale gas and the like is advanced. However, the non-conventional oil gas resources in China are generally deep in burial depth, complex seam networks are difficult to form under the conditions of high stress difference and large burial depth, and the integral shortage of water resources is not beneficial to the popularization of hydraulic fracturing technology.
The explosion fracturing technology is not limited by water sensitive and acid sensitive stratum, and can form a plurality of radial cracks which are not controlled by ground stress by generating higher peak pressure and faster impact loading rate. The fracture remains open under high closure stresses even without the addition of proppants during the fracturing process.
The existing blasting fracturing transformation process mostly adopts a mode of perforation operation matched with explosive throwing and explosive detonating to generate cracks and communicate a shaft and a reservoir, but the process engineering quantity is large, the effective action time of blasting pressure is short, the seam making scale is limited, and meanwhile, the transportation throwing of a fire product also causes great potential safety hazard, so that the method is not beneficial to on-site popularization and application.
Disclosure of Invention
According to the defects of the explosion fracturing technology, the invention provides an in-situ explosion perforation fracturing integrated device and method for methane in a horizontal well open hole section, methane gas desorbed from a reservoir is used as combustible, after a perforation explosion fracturing string is sent into a target fracturing section, an exhaust emission system and a pressurizing pumping system are matched to complete mixing of methane gas storage and combustion improver, and then in-situ detonation is carried out, high-energy explosion gas cooperates with a novel perforating bullet to complete perforation operation to form preset cracks, then exhaust emission is repeated, the methane gas in the reservoir is introduced, combustion improver is pumped, and the process of ignition detonation is carried out, so that multistage repeated fracturing operation of the fracturing section is completed under the condition of not moving the string is realized, and a larger-scale diversion crack network is obtained, so that safe and efficient exploitation of shale gas is realized.
The technical scheme of the invention is as follows:
the horizontal well open hole section methane in-situ perforation, blasting and fracturing integrated device suitable for the reservoirs of complex dense gas, shale gas and the like comprises a detonation device and a perforation, blasting and fracturing integrated device which are connected in sequence;
the detonation device is used for carrying the combustion improver into the well, controlling the pumping of the combustion improver and controlling the discharge of waste gas;
the perforation blasting fracturing integrated device is used for completing perforation and fracturing operation of a target layer fracturing section.
According to a preferred embodiment of the present invention, the detonation device includes a combustion improver storage tank, a pressurized pumping system, an exhaust gas discharge system, and an igniter;
the combustion improver storage tank is used for carrying the combustion improver into the well;
one end of the pressurizing and pumping system is connected with the combustion improver storage tank, the other end of the pressurizing and pumping system is connected with the perforation, combustion, explosion and fracturing integrated device, and pumping of the combustion improver is controlled through the pressurizing and pumping system;
one end of the exhaust gas emission system is connected with an annular space outside the gas exhaust transmission ignition pipe column, the other end of the exhaust gas emission system is connected with the perforation, combustion, explosion and fracturing integrated device, and exhaust gas emission is controlled through the exhaust gas emission system;
according to the invention, the pressurizing and pumping system, the waste gas discharging system and the igniter are integrated in the same gas discharging and conveying ignition pipe column, one end of the gas discharging and conveying ignition pipe column is provided with an internal thread joint and is connected with the combustion improver storage tank, and the other end of the gas discharging and conveying ignition pipe column is provided with an external thread joint and is connected with the perforation, combustion and explosion and fracturing integrated device.
According to the invention, the perforation, blasting and fracturing integrated device comprises a novel perforation bullet and perforation, blasting and fracturing integrated tubular column;
the wall surface of the perforation blasting fracturing integrated tubular column is provided with a groove for bearing the novel perforating bullet and guiding blasting gas to directionally form a seam; and a space in the perforation, blasting and fracturing integrated tubular column forms a containing cavity.
Further preferably, the novel perforating bullet is reserved with holes, and the shaped explosive is filled in the novel perforating bullet.
Further preferably, the aperture of the perforations of the new perforating charge is not less than 5mm.
Further preferably, the groove is a strip-shaped groove.
Further preferably, the perforation, combustion and explosion integrated pipe column has at least two strip-shaped grooves on the same circular section, and the number of the strip-shaped grooves on the wall surface of the perforation, combustion and explosion integrated pipe column is not less than three.
According to the invention, the perforation, combustion and explosion integrated device further comprises a left buffer and a right buffer, and the left buffer and the right buffer are respectively arranged at two ends of the perforation, combustion and explosion integrated pipe column.
According to the invention, preferably, the horizontal well open hole section methane in-situ perforation, combustion, explosion and fracturing integrated device further comprises a tubular column auxiliary device;
the tubular column auxiliary device comprises a left centralizer, a right centralizer, a left open hole packer and a right open hole packer;
the left centralizer is arranged on the combustion improver storage tank shell, and the right centralizer is arranged at the end part of the perforation, combustion explosion and fracturing integrated device; the left open hole packer is located in the middle of the gas drainage ignition pipe column, and the right open hole packer is located between the right buffer and the right centralizer and used for separating an annular space of the fracturing section.
According to the invention, preferably, the igniter comprises an ignition wire, the ignition wire is exposed in the perforation, combustion, explosion and fracturing integrated pipe column inner cavity, and the rest part of the igniter is hermetically arranged in the gas discharge and transportation ignition pipe column.
Further preferred ignition wires are made of high strength conductive metal materials including copper-chromium alloys, copper-silver alloys, and nanocrystalline copper.
According to the invention, at least two left centralizers and at least one right centralizer are preferred.
A perforation fracturing method of a horizontal well open hole section methane in-situ perforation explosion fracturing integrated device suitable for complex dense gas, shale gas and other reservoirs comprises the following steps:
(1) Embedding the novel perforating bullet into a strip-shaped groove of a perforating, burning, explosion and fracturing integrated tubular column, and installing a right buffer, a left buffer, a right open hole packer and a right centralizer; then the gas discharging and transporting ignition pipe column with the left open hole packer and the combustion improver storage tank with the left centralizer are screwed in sequence;
(2) The methane in-situ perforation, blasting and fracturing integrated device of the open hole section of the horizontal well and the oil pipe column are put into the open hole fracturing section of the target layer of the horizontal well;
(3) After the left centralizer and the right centralizer control the in-situ perforation, combustion, explosion and fracturing integrated device of the methane in the open hole section of the horizontal well to be centered, the left open hole packer and the right open hole packer finish the setting of the open hole section, and separate annular spaces around the open hole section;
(4) Opening an exhaust emission system, discharging the annular space between the left open hole packer and the right open hole packer and the gas in the containing cavity of the perforating, blasting and fracturing integrated tubular column, and enabling methane gas desorbed from the reservoir to enter the containing cavity through the holes reserved by the novel perforating charges;
(5) After the methane gas fills the cavity, closing the waste gas discharge system, starting the pressurizing and pumping system, conveying the combustion improver into the cavity, and closing the pressurizing and pumping system after the mixing proportion requirement is met;
(6) After the gas storage is finished, the igniter ignites, high-temperature high-pressure explosive gas impacts the burning reservoir through the holes of the novel perforating bullet on one hand, and bombs the explosive cover on the other hand, so that the shaped explosive is caused to explode, high-speed metal jet flow is generated, the reservoir is penetrated, and the perforation of the fracturing section is finished cooperatively;
(7) After perforation operation is completed, exhaust gas is discharged, methane gas in a reservoir is introduced, combustion improver is pumped in, ignition and detonation are carried out, and the explosion gas is directionally ejected out through the strip-shaped grooves to form a horizontal well open hole section radial multi-slit three-dimensional seam net;
(8) Repeating the step (7), namely completing multistage repeated fracturing operation of the target layer fracturing section under the condition of not moving the pipe column, so that the volume of the fracture network is expanded;
(9) After the section of fracturing is completed, the methane in-situ perforation, burning, explosion and fracturing integrated device of the open hole section of the horizontal well is withdrawn from the shaft, the novel perforating charges are reinstalled, the perforation, burning, explosion and fracturing process is repeated in the next fracturing section, and staged fracturing is realized.
The invention has the beneficial effects that:
1. the novel process adopted by the invention comprises a combustion improver storage tank, a pressurized pumping system, an exhaust emission system, a buffer, an igniter, a novel perforating bullet, a perforating blasting fracturing integrated tubular column, a centralizer, an open hole packer and other system equipment, and the equipment and methane gas desorbed by the open hole section are utilized to complete perforating blasting fracturing operation under the condition of an immovable tubular column, so that the processes of ground transportation, underground throwing and the like of explosives in the blasting fracturing process are avoided, the perforating blasting fracturing device and process are optimized, the construction process is safe and environment-friendly, the defects of the existing blasting fracturing technology can be overcome, and the on-site popularization and application are facilitated.
2. The combustible material adopted by the invention is methane gas desorbed from the reservoir, and the methane gas replaces the traditional detonating cord to detonate the novel perforating bullet on one hand, and replaces the artificial explosive to serve as the combustible material in the blasting and fracturing process on the other hand, so that the construction process is more environment-friendly and economical.
3. The detonation device adopted by the invention adopts standardized design at the pipe column connection parts such as the perforation, blasting and fracturing integrated device, and the pipe columns are connected with the well by screwing in, so that the device has simple structure and reasonable design, and is convenient for construction operation and maintenance.
4. The novel perforating bullet matched with the strip-shaped groove can orient perforation and make seams, accords with the cracking rule of the seams, and is easier to form a three-dimensional seam net.
5. The perforation, explosion and fracturing integrated device adopted by the invention is matched with reservoir methane gas, can complete perforation operation and repeated explosion and fracturing under the condition of not moving a tubular column, not only simplifies the construction flow, but also ensures the effective action time of explosion pressure, and has larger seam making regulation.
6. The open hole perforation completion mode adopted by the invention can make up the characteristic of limited crack initiation capability of blasting fracturing to a certain extent, and provides a more reasonable design for popularization of the process.
Drawings
Fig. 1 is a schematic structural diagram of an in-situ perforation, explosion and fracturing integrated device for methane in an open hole section of a horizontal well.
Fig. 2 is a schematic diagram of a perforating, blasting and fracturing integrated tubular column.
FIG. 3 is a cross-sectional view of a perforating detonation fracturing integrated tubular string and a novel perforating bullet.
1. A combustion improver storage tank; 2. a pressurized pumping system; 3. an exhaust emission system; 4. an igniter; 5. an ignition wire; 6-1, left buffer; 6-2, right buffer; 7. a novel perforating bullet; 8. perforating, burning, bursting and fracturing integrated pipe column; 9. a cavity; 10-1, left centralizer; 10-2, right centralizer; 11-1, left open hole packer; 11-2, right open hole packer; 12. a groove; 13. an eyelet; 14. an energy accumulating explosive; 15. a metal housing; 16. a medicine cover.
Detailed Description
The invention will now be further illustrated by way of example, but not by way of limitation, with reference to the accompanying drawings.
Example 1
The horizontal well open hole section methane in-situ perforation, blasting and fracturing integrated device suitable for the reservoirs of complex dense gas, shale gas and the like comprises a detonation device and a perforation, blasting and fracturing integrated device which are connected in sequence;
the detonation device is used for carrying the combustion improver into the well, controlling the pumping of the combustion improver and controlling the discharge of waste gas; the perforation, blasting and fracturing integrated device is used for completing perforation and fracturing operation of a target layer fracturing section.
The perforation, explosion and fracturing integrated device is used for completing perforation and fracturing operation of a target layer fracturing section, conventional perforation and fracturing processes and operation equipment are completely independent, the perforation, explosion and fracturing integrated device belongs to the same operation pipe column on one hand, and on the other hand, the unique device structure can effectively utilize methane gas separated out of stratum to complete perforation and fracturing operation, so that the purpose of completing perforation and multistage repeated fracturing operation of the fracturing section under the condition of not moving the pipe column is achieved.
Example 2
According to the embodiment 1, the horizontal well naked eye section methane in-situ perforation, combustion and explosion and fracturing integrated device suitable for the reservoirs of complex dense gas, shale gas and the like is characterized in that:
as shown in fig. 1, the detonation device comprises a combustion improver storage tank 1, a pressurizing and pumping system 2, an exhaust gas discharge system 3 and an igniter 4;
the combustion improver storage tank 1 is used for carrying a sufficient amount of combustion improver into a well; the combustion improver storage tank 1 one end is equipped with the female screw joint, and the other end is the outside of giving vent to anger the end and is equipped with the male screw joint, and the female screw joint is connected with conventional tubular column, passes through the male screw joint and connects the gas exhaust and transport ignition tubular column.
One end of the pressurizing and pumping system 2 is connected with the combustion improver storage tank 1, the other end of the pressurizing and pumping system 2 is connected with the perforation, combustion, explosion and fracturing integrated device, and pumping of the combustion improver is controlled through the pressurizing and pumping system 2; the pressurizing and pumping system 2 is used for detecting the mixing proportion of methane gas and combustion improver in the perforation, combustion and explosion integrated device and controlling the pumping quantity of the combustion improver. The pressurizing and pumping system 2 is provided based on the purpose of completing reservoir explosion fracturing by using stratum methane gas, and the problems of insufficient feeding amount of the combustion improver and how the combustion improver is effectively mixed with the methane gas under higher stratum pressure can be solved by matching the combustion improver storage tank 1.
One end of the waste gas discharging system 3 is connected with an annular space outside the gas discharging and transporting ignition pipe column, and the annular space refers to an annular space between the operation pipe column and the wall surface of the shaft; the other end is connected with a perforation blasting fracturing integrated device, and the exhaust emission is controlled through an exhaust emission system 3; the exhaust emission system 3 is used for detecting methane gas and combustion exhaust gas content in the perforation, combustion and explosion integrated device, controlling exhaust of exhaust gas and filling of the methane gas in the perforation, combustion and explosion integrated device. The exhaust emission system 3 is proposed based on the purpose of completing reservoir blasting fracturing by using stratum methane gas, and is used for completing first exhaust emission through matching perforation charge reserved holes 13, methane filling and blasting perforation operation in the cavity 9, and subsequent repeated exhaust emission through matching strip-shaped grooves, and methane filling and blasting fracturing operation.
The pressurizing and pumping system 2, the waste gas discharging system 3 and the igniter 4 are integrated in the same gas discharging and conveying ignition pipe column, one end of the gas discharging and conveying ignition pipe column is provided with an internal thread joint and is connected with the combustion improver storage tank 1, and the other end of the gas discharging and conveying ignition pipe column is provided with an external thread joint and is connected with the perforation, combustion, explosion and fracturing integrated device.
The igniter 4 comprises an ignition wire 5, the ignition wire 5 is exposed in a cavity 9 in the perforating, blasting and fracturing integrated pipe column 8, and the rest parts of the igniter 4 are hermetically arranged in the gas discharging and transporting ignition pipe column. The ignition wire 5 is made of high-strength conductive metal materials including copper-chromium alloy, copper-silver alloy and nanocrystalline copper.
The perforation, blasting and fracturing integrated device comprises a novel perforation bullet 7 and a perforation, blasting and fracturing integrated tubular column 8;
as shown in fig. 2, a groove 12 is arranged on the wall surface of the perforation, blasting and fracturing integrated tubular column 8 and is used for bearing the novel perforating charges 7 and guiding blasting gas to directionally produce a seam; the space in the perforating, blasting and fracturing integrated tubular column 8 forms a containing cavity 9.
As shown in fig. 3, the novel perforating bullet 7 is reserved with an eyelet 13, the novel perforating bullet 7 is internally provided with an shaped explosive 14, the shaped explosive 14 is arranged in a medicine cover 16, and the shell of the novel perforating bullet 7 is a metal shell 15.
The aperture of the perforation 13 of the novel perforating bullet 7 is not less than 5mm.
The grooves 12 are bar-shaped grooves. The strip-shaped grooves can be used for loading a plurality of perforating bullets with square substrates on one hand, and on the other hand, the strip-shaped grooves can be used for inducing high-energy blasting gas to directionally produce cracks so as to form a radial multi-crack network.
The same circular section of the perforation, explosion and fracturing integrated pipe column 8 is provided with at least two strip-shaped grooves, and the number of the strip-shaped grooves on the wall surface of the perforation, explosion and fracturing integrated pipe column 8 is not less than three.
The perforation, blasting and fracturing integrated device further comprises a left buffer 6-1 and a right buffer 6-2, and the two ends of the perforation, blasting and fracturing integrated tubular column 8 are respectively provided with the left buffer 6-1 and the right buffer 6-2. The axial severe vibration of the perforating, blasting and fracturing integrated tubular column 8 can be relieved.
Example 3
According to embodiment 2, the horizontal well naked eye section methane in-situ perforation, combustion and explosion and fracturing integrated device suitable for reservoirs of complex dense gas, shale gas and the like is characterized in that:
the horizontal well open hole section methane in-situ perforation, combustion and explosion fracturing integrated device also comprises a tubular column auxiliary device;
the tubular column auxiliary device comprises a left centralizer 10-1, a right centralizer 10-2, a left open hole packer 11-1 and a right open hole packer 11-2;
the left centralizer 10-1 is arranged on the shell of the combustion improver storage tank 1, and the right centralizer 10-2 is arranged at the end part of the perforation, combustion explosion and fracturing integrated device; in a horizontal well, a working string is affected by gravity and can be rubbed with a well wall, so that the working string and a well shaft can be damaged, and the left centralizer 10-1 and the right centralizer 10-2 are required to be installed before the well is run in order to ensure that the working string can smoothly reach a target layer and work normally.
The left open hole packer 11-1 is located at the middle of the gas drainage ignition pipe column, the right open hole packer 11-2 is located between the right buffer 6-2 and the right centralizer 10-2, and the right open hole packer 11-2 is located at the 0.5m position of the right end of the right buffer 6-2 and used for separating the annular space of the fracturing section.
At least two of the left centralizers 10-1 and at least one of the right centralizers 10-2.
Example 4
Embodiment 3 of a perforation fracturing method of a horizontal well open hole section methane in-situ perforation, combustion and explosion fracturing integrated device suitable for a complex dense gas, shale gas and other reservoirs, comprising the following steps:
(1) The novel perforating bullet 7 is embedded into a strip-shaped groove of a perforating, burning, explosion and fracturing integrated tubular column 8, and a right buffer 6-2, a left buffer 6-1, a right open hole packer 11-2 and a right centralizer 10-2 are installed; then the gas discharging and transporting ignition pipe column with the left open hole packer 11-1 and the combustion improver storage tank 1 with the left centralizer 10-1 are screwed in sequence;
(2) The methane in-situ perforation, blasting and fracturing integrated device of the open hole section of the horizontal well and the oil pipe column are put into the open hole fracturing section of the target layer of the horizontal well;
(3) After the left centralizer 10-1 and the right centralizer 10-2 control the methane in-situ perforation, combustion, explosion and fracturing integrated device of the open hole section of the horizontal well to be centered, the left open hole packer 11-1 and the right open hole packer 11-2 complete the setting of the open hole section and separate annular spaces around the open hole section;
(4) Opening an exhaust emission system 3, discharging the annular space between the left open hole packer 11-1 and the right open hole packer 11-2 and the gas in the containing cavity 9 of the perforation, blasting and fracturing integrated tubular column 8, and allowing methane gas desorbed from a reservoir to enter the containing cavity 9 through the holes 13 reserved by the novel perforating charges 7;
(5) After methane gas fills the containing cavity 9, the exhaust gas emission system 3 is closed, the pressurizing and pumping system 2 is started, the combustion improver is conveyed into the containing cavity 9, after the mixing proportion requirement is met, the mixing proportion requirement of the gas can meet the requirement of crack transformation scale under the consideration of the combustion improver type, the methane content of a reservoir and other factors, the specific mixing proportion is determined according to actual conditions, and the pressurizing and pumping system 2 is closed;
(6) After the gas storage is finished, the igniter 4 is ignited, high-temperature high-pressure explosive gas impacts and burns the reservoir through the holes 13 of the novel perforating bullet 7 on one hand, and on the other hand, the explosive cover 16 is bombarded to promote the explosive 14 to explode, generate high-speed metal jet, penetrate the reservoir and cooperatively finish the perforation of the fracturing section;
(7) After perforation operation is completed, exhaust gas is discharged, methane gas in a reservoir is introduced, combustion improver is pumped in, ignition and detonation are carried out, and the explosion gas is directionally ejected out through the strip-shaped grooves to form a horizontal well open hole section radial multi-slit three-dimensional seam net;
(8) Repeating the step (7), namely completing multistage repeated fracturing operation of the target layer fracturing section under the condition of not moving the pipe column, so that the volume of the fracture network is expanded;
(9) After the section of fracturing is completed, the methane in-situ perforation, blasting and fracturing integrated device of the open hole section of the horizontal well is withdrawn from the shaft, the novel perforating bullet 7 is reinstalled, the perforation, blasting and fracturing process is repeated in the next fracturing section, and staged fracturing is realized.
And after the in-situ perforation, blasting and fracturing of methane in the open hole section of the horizontal well are finished, withdrawing the operation pipe column, cleaning the well shaft, and evaluating the construction effect.
In the embodiment, the well depth of the target layer is 2000m, the fracture pressure of the stratum is 43MPa, the length of the open hole section is 10m, and the average diameter of the open hole section is 152.4mm.
In this embodiment, the individual device dimensions: the outer diameter of the oil pipe is 114.3mm; the length of the detonating device is 3m, the outer diameter is 114.3mm, and the wall thickness is 6.88mm; the length of the combustion improver storage tank 1 is 2m; the perforation, burning and fracturing integrated tubular column 8 is 6m long, 120mm in outer diameter and 25mm in wall thickness; the length of the strip-shaped groove is 1m, and the width is 25mm; the central aperture of the novel perforating bullet 7 is 6mm, the bottom dimension is 25 multiplied by 25mm, and the height is 25mm.
In the embodiment, the adopted combustible is methane gas desorbed from the reservoir, and the gas replaces the traditional detonating cord to detonate the novel perforating bullet 7 on one hand, and replaces the artificial explosive to serve as the combustible in the explosion fracturing process on the other hand, so that the application of the fire products is effectively avoided, and the construction process is safer and more economical; the detonation device, the perforation, blasting and fracturing integrated device adopts a standardized design, is connected with a well by a threaded screwing mode, and is convenient for construction operation and repeated use after maintenance; the perforation, blasting and fracturing integrated device selects a perforation, blasting and fracturing integrated tubular column 8 with three rows of grooves 12 according to construction requirements to make a seam, wherein one row of grooves 12 is provided with three strip-shaped grooves; by using the equipment and methane gas desorbed from the naked eye section, perforation operation and repeated blasting fracturing can be completed under the condition of no pipe string, thereby not only simplifying the construction flow, but also guaranteeing the effective acting time of blasting pressure and realizing larger seam making gauge.
Example 5
According to embodiment 4, the perforation fracturing method of the horizontal well open hole section methane in-situ perforation burning explosion fracturing integrated device suitable for the reservoirs of complex dense gas, shale gas and the like is characterized in that:
in the embodiment, the well depth of the target layer is 3000m, the stratum fracture pressure is 61MPa, the open hole section is 8m long, the central aperture of the novel perforating bullet 7 is 5mm, the perforating, blasting and fracturing integrated device selects a perforating, blasting and fracturing integrated tubular column 8 with three rows of grooves 12 according to construction requirements to make a seam, and one row of grooves 12 is provided with 4 strip-shaped grooves.
Example 6
According to embodiment 4, the perforation fracturing method of the horizontal well open hole section methane in-situ perforation burning explosion fracturing integrated device suitable for the reservoirs of complex dense gas, shale gas and the like is characterized in that:
in the embodiment, the well depth of the target layer is 4000m, the stratum fracture pressure is 82MPa, the length of the open hole section is 10m, the central aperture of the novel perforating bullet 7 is 5mm, the perforating, blasting and fracturing integrated device selects a perforating, blasting and fracturing integrated tubular column 8 with five rows of grooves 12 according to construction requirements to make a seam, and one row of grooves 12 is provided with 5 strip-shaped grooves.
Claims (12)
1. The horizontal well open hole section methane in-situ perforation, explosion and fracturing integrated device suitable for the complex dense gas and shale gas reservoirs is characterized by comprising a detonation device and a perforation, explosion and fracturing integrated device which are connected in sequence;
the detonation device is used for carrying the combustion improver into the well, controlling the pumping of the combustion improver and controlling the discharge of waste gas;
the perforation, blasting and fracturing integrated device is used for completing perforation and fracturing operation of a target layer fracturing section;
the perforation, blasting and fracturing integrated device comprises a perforation bullet and perforation, blasting and fracturing integrated tubular column;
the wall surface of the perforation blasting fracturing integrated tubular column is provided with a groove for bearing the perforating charges and guiding blasting gas to directionally form a seam; the space in the perforation, blasting and fracturing integrated tubular column forms a containing cavity;
the detonation device comprises a combustion improver storage tank, a pressurizing and pumping system, an exhaust emission system and an igniter;
the combustion improver storage tank is used for carrying the combustion improver into the well;
one end of the pressurizing and pumping system is connected with the combustion improver storage tank, the other end of the pressurizing and pumping system is connected with the perforation, combustion, explosion and fracturing integrated device, and pumping of the combustion improver is controlled through the pressurizing and pumping system;
and one end of the exhaust gas emission system is connected with an annular space outside the gas exhaust transmission ignition pipe column, the other end of the exhaust gas emission system is connected with the perforation, combustion, explosion and fracturing integrated device, and the exhaust gas emission is controlled through the exhaust gas emission system.
2. The horizontal well naked eye section methane in-situ perforation, combustion and explosion and fracturing integrated device suitable for complex dense gas and shale gas reservoirs is characterized in that a pressurizing pumping system, an exhaust emission system and an igniter are integrated in the same gas discharging and conveying ignition pipe column, one end of the gas discharging and conveying ignition pipe column is provided with an internal thread joint and is connected with a combustion improver storage tank, and the other end of the gas discharging and conveying ignition pipe column is provided with an external thread joint and is connected with the perforation, combustion and explosion and fracturing integrated device.
3. The horizontal well open hole section methane in-situ perforation, combustion and explosion integrated device suitable for complex dense gas and shale gas reservoirs according to claim 2, wherein perforations are reserved in perforating charges, and shaped charges are filled in the perforating charges.
4. The horizontal well open hole section methane in-situ perforation, combustion and explosion integrated device suitable for complex dense gas and shale gas reservoirs according to claim 3, wherein the aperture of the perforation of the perforating bullet is not less than 5mm.
5. The horizontal well open hole section methane in-situ perforation, combustion and explosion and fracturing integrated device suitable for complex dense gas and shale gas reservoirs according to claim 4, wherein the grooves are strip-shaped grooves.
6. The horizontal well open hole section methane in-situ perforation, explosion and fracturing integrated device suitable for the complex dense gas and shale gas reservoirs is characterized in that at least two strip-shaped grooves are formed in the same circular section of the perforation, explosion and fracturing integrated tubular column, and the number of the strip-shaped grooves on the wall surface of the perforation, explosion and fracturing integrated tubular column is not less than three.
7. The horizontal well open hole section methane in-situ perforation, combustion and explosion and fracturing integrated device suitable for the complex dense gas and shale gas reservoirs, which is disclosed in claim 6, is characterized by further comprising a left buffer and a right buffer, wherein the left buffer and the right buffer are respectively arranged at two ends of the perforation, combustion and explosion and fracturing integrated tubular column.
8. The horizontal well open hole section methane in-situ perforation, combustion and explosion and fracturing integrated device suitable for complex dense gas and shale gas reservoirs is characterized by further comprising a tubular column auxiliary device;
the tubular column auxiliary device comprises a left centralizer, a right centralizer, a left open hole packer and a right open hole packer;
the left centralizer is arranged on the combustion improver storage tank shell, and the right centralizer is arranged at the end part of the perforation, combustion explosion and fracturing integrated device;
the left open hole packer is located in the middle of the gas drainage ignition pipe column, and the right open hole packer is located between the right buffer and the right centralizer and used for separating an annular space of the fracturing section.
9. The horizontal well open hole section methane in-situ perforation, combustion and explosion integrated device suitable for complex dense gas and shale gas reservoirs according to claim 8, wherein at least two left centralizers and at least one right centralizer are arranged.
10. The horizontal well open hole section methane in-situ perforation, combustion, explosion and fracturing integrated device suitable for complex dense gas and shale gas reservoirs according to claim 9, wherein the igniter comprises an ignition wire, the ignition wire is exposed in the perforation, combustion, explosion and fracturing integrated tubular column inner cavity, and the rest part of the igniter is hermetically installed in the gas discharging and transporting ignition tubular column.
11. The horizontal well open hole section methane in-situ perforation, combustion and explosion integrated device suitable for complex dense gas and shale gas reservoirs according to claim 10, wherein the ignition wire is made of high-strength conductive metal materials, including copper-chromium alloy, copper-silver alloy and nanocrystalline copper.
12. The perforation fracturing method of the horizontal well open hole section methane in-situ perforation burning explosion fracturing integrated device suitable for the complex dense gas and shale gas reservoirs is characterized by being realized by the horizontal well open hole section methane in-situ perforation burning explosion fracturing integrated device suitable for the complex dense gas and shale gas reservoirs, and comprises the following steps of:
(1) The perforating bullet is embedded into a strip-shaped groove of a perforating, burning, explosion and fracturing integrated tubular column, and a right buffer, a left buffer, a right open hole packer and a right centralizer are installed; then the gas discharging and transporting ignition pipe column with the left open hole packer and the combustion improver storage tank with the left centralizer are screwed in sequence;
(2) The methane in-situ perforation, blasting and fracturing integrated device of the open hole section of the horizontal well and the oil pipe column are put into the open hole fracturing section of the target layer of the horizontal well;
(3) After the left centralizer and the right centralizer control the in-situ perforation, combustion, explosion and fracturing integrated device of the methane in the open hole section of the horizontal well to be centered, the left open hole packer and the right open hole packer finish the setting of the open hole section, and separate annular spaces around the open hole section;
(4) Opening an exhaust emission system, discharging the annular space between the left open hole packer and the right open hole packer and the gas in the containing cavity of the perforating, blasting and fracturing integrated tubular column, and enabling methane gas desorbed from the reservoir to enter the containing cavity through the holes reserved by the perforating charges;
(5) After the methane gas fills the cavity, closing the waste gas discharge system, starting the pressurizing and pumping system, conveying the combustion improver into the cavity, and closing the pressurizing and pumping system after the mixing proportion requirement is met;
(6) After the gas storage is finished, the igniter ignites, high-temperature high-pressure explosive gas impacts the burning reservoir through the holes of the perforating bullet on one hand, and on the other hand, the explosive cover is bombarded to promote the explosive to explode, high-speed metal jet flow is generated, the reservoir is penetrated, and perforation of the fracturing section is finished cooperatively;
(7) After perforation operation is completed, exhaust gas is discharged, methane gas in a reservoir is introduced, combustion improver is pumped in, ignition and detonation are carried out, and the explosion gas is directionally ejected out through the strip-shaped grooves to form a horizontal well open hole section radial multi-slit three-dimensional seam net;
(8) Repeating the step (7), namely completing multistage repeated fracturing operation of the target layer fracturing section under the condition of not moving the pipe column, so that the volume of the fracture network is expanded;
(9) After the fracturing of the target layer fracturing section is completed, the methane in-situ perforation, blasting and fracturing integrated device of the open hole section of the horizontal well is withdrawn from the shaft, the perforating charges are reinstalled, and the perforation, blasting and fracturing process is repeated in the next fracturing section, so that staged fracturing is realized.
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| CN114352253B (en) * | 2022-01-09 | 2022-08-23 | 中国矿业大学 | Shale reservoir methane multiple in-situ combustion-explosion fracturing method |
| CN115059444B (en) * | 2022-07-08 | 2023-06-23 | 中国石油大学(华东) | Methane in-situ blasting device, multistage fracturing system and fracturing method thereof |
| CN115234200B (en) * | 2022-08-01 | 2023-05-09 | 中国矿业大学 | Unconventional natural gas reservoir methane in-situ fixed-point blasting fracturing method |
| CN115419387B (en) * | 2022-11-04 | 2023-01-20 | 中国石油大学(华东) | Underground power-on assisted shale reservoir methane in-situ combustion and explosion fracturing device and method |
| CN116398106B (en) * | 2023-04-26 | 2024-05-07 | 中国矿业大学 | Shale reservoir in-situ analysis methane high-efficiency utilization and multistage energy-gathering combustion explosion fracturing method |
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