CN112983383A - Vertical well methane in-situ combustion and explosion fracturing device and method - Google Patents
Vertical well methane in-situ combustion and explosion fracturing device and method Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 107
- 238000004880 explosion Methods 0.000 title claims abstract description 51
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 53
- 238000010304 firing Methods 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 21
- 238000010276 construction Methods 0.000 claims abstract description 15
- 239000011148 porous material Substances 0.000 claims abstract description 13
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000003860 storage Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 13
- 238000005474 detonation Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 3
- 238000005422 blasting Methods 0.000 abstract description 14
- 239000002360 explosive Substances 0.000 abstract description 9
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000000977 initiatory effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009430 construction management Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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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Abstract
The invention relates to a vertical well methane in-situ combustion and explosion fracturing device and method, and belongs to the technical field of combustion and explosion fracturing. The device comprises system equipment consisting of a packer, a sieve tube, a one-way valve, a detonating device and the like, and can realize methane gas separation and in-situ combustion and explosion of the stratum. Pumping low-density well killing fluid from an oil sleeve annulus by using a pump truck to replace the original well killing fluid, discharging mixed fluid of a target layer in the process through a one-way valve of a detonating device, transferring high-density well killing fluid when methane gas is detected at a wellhead, closing the one-way valve, completing gas storage of a cavity of the detonating device and the oil sleeve annulus, and finally carrying out rod throwing operation from the wellhead, wherein the lower bearing disc is sheared and broken by huge impact force, the combustion improver and a clamp holder are in quick contact with a firing pin to trigger formation methane gas explosion, and explosive gas flow is ejected at high speed along the sleeve pores to trigger and break the formation. The invention provides a new blasting mode, so that blasting fracturing operation is safer and more efficient, the traditional blasting effect is achieved, and meanwhile, the construction risk and the construction cost are reduced.
Description
Technical Field
The invention relates to a vertical well methane in-situ combustion and explosion fracturing device and method, which are suitable for reservoirs of complex shale gas, dense gas and the like and belong to the technical field of combustion and explosion fracturing.
Background
With the development of middle-high-permeability oil and gas fields in the later period and the increasing demand on oil and gas resources, the proportion of low-permeability and unconventional oil and gas reservoir resources which become the oil and gas resource increasing and storing yield is gradually increased, wherein dense gas, shale gas, coal bed gas and the like become the main components of the oil and gas increasing and storing. Because reservoirs such as dense gas and shale gas generally have the characteristics of low porosity and low permeability, fracturing is an essential means for realizing commercial exploitation of the reservoirs. The hydraulic fracturing water consumption is large, and especially for deep, compact and high-stress difference reservoirs in China, a hydraulic fracture net is difficult to form.
The blasting fracturing technology can crack a reservoir by means of higher instantaneous blasting pressure, can effectively modify the reservoir of a compact and low-permeability complex oil-gas reservoir, can break through stress concentration, promotes the development of a complex seam network, is low in cost and pollution-free, but the existing blasting technology generally injects an explosive formed by mixing a combustion agent and a combustion improver into a bottom stratum simultaneously, the explosive is generally a military product and cannot avoid the safety in the transportation and injection processes, the safety problem of the initiating explosive product exists, the detonation range is limited, great potential safety hazards exist in the manufacturing, transportation, storage and putting processes, and high requirements are provided for the construction management capability of workers.
Disclosure of Invention
Aiming at the defects of the prior art and shale gas reservoirs, the invention provides a vertical well methane in-situ combustion-explosion fracturing device and method. Furthermore, through the combined action of rod throwing impact and the pressure difference between the upper part and the lower part of the detonator, the firing pin is impacted, so that the in-situ synergistic combustion and explosion of the combustion improver in the detonating device and the methane gas in the shaft are realized, impact cracks are formed in the matrix around the shaft, a true three-dimensional crack network is realized, and the yield of the stratum after modification is improved.
The technical scheme of the invention is as follows:
a vertical well methane in-situ combustion-explosion fracturing device suitable for reservoirs of complex shale gas, dense gas and the like comprises an oil pipe device and an explosive device,
the oil pipe device comprises a conventional oil pipe column, an upper packer and a lower packer are arranged at the bottom of the oil pipe column from top to bottom, and an upper sieve pipe is arranged inside the oil pipe column above the upper packer;
the detonation device comprises a special pipe column, an upper fixing groove is arranged above the inner wall of the special pipe column, a combustion improver holder is arranged in the middle of the special pipe column, a combustion improver is placed in the combustion improver holder, a sealing tank in the holder can be filled with the combustion improver in solid, liquid and gas states, the combustion improver can be prepared by adopting the conventional method in the field, and the upper fixing groove is used for limiting the upward displacement of the combustion improver holder; an integrated firing pin device is arranged at the bottom of the special tubular column, a firing pin is arranged at the center of the bottom of the integrated firing pin device, a cavity of the firing pin is used for containing methane gas and fragments of a lower pressure bearing disc, and a lower pressure bearing disc is arranged between the combustion improver clamper and the integrated firing pin device.
Preferably, the top of the inner wall of the special pipe column is provided with an upper joint, the upper joint is an internal thread, the bottom of the special pipe column is provided with a lower joint, the lower joint is an external thread, and the upper joint and the lower joint are connected with the oil pipe column.
The interior of the conventional pipe column is hollow and smooth, a channel is provided for fluid migration or shaft bottom tool operation, and a fixing groove and an internal thread are arranged in the specially-produced pipe column in the scheme and can be used for containing a combustion improver holder and the like. Compared with the conventional process of putting the pipe column into the blasting device after blasting operation of throwing the rod, the process has the advantages that the special pipe column fixes the blasting device and then puts the pipe column into the well together, and the operation is more convenient.
Preferably, the combustion improver holder shell is provided with a shell through hole. The combustion improver clamper can be burnt and exploded outwards through the through hole of the shell when falling down and colliding with the firing pin.
Further preferably, the number of housing through holes is at least three rows.
Preferably, the top of the combustion improver holder is provided with one-way valves, and further preferably, the number of the one-way valves is two. The check valve can only open upwards.
Preferably, the top of the combustion improver holder is provided with an upper bearing plate, the upper bearing plate and the combustion improver holder are integrally manufactured, and the one-way valve penetrates through the upper bearing plate and the top of the combustion improver holder. The upper bearing disc is used for increasing the bearing strength of the top surface of the clamp holder, and the clamp holder is enabled to fracture the lower bearing disc when the rod is thrown in the blasting process, so that the top surface of the clamp holder is prevented from being damaged.
Preferably, the center of the bottom of the combustion improver holder and the center of the lower pressure bearing disc are both provided with a central through hole.
Further preferably, the size of the central through hole at the bottom of the combustion improver holder is the same as that of the central through hole of the lower bearing plate.
Preferably, the side wall of the integrated striker device and the bottom of the specially-made tubular column at the periphery of the integrated striker device are provided with sieve holes.
Preferably, the lower pressure bearing disc, the integrated firing pin device and the inner wall of the specially-made tubular column are in threaded connection. Can be fixed in the special pipe column through the knob.
Preferably, the vertical distance between the upper sieve tube and the upper packer is 0.5-1.0 m.
A vertical well methane in-situ combustion and explosion fracturing method suitable for reservoirs of complex shale gas, dense gas and the like comprises the following steps:
(1) the combustion improver clamper is jacked to a fixing groove on a specially-made pipe column, the combustion improver clamper is prevented from moving upwards by the fixing groove, then the combustion improver clamper is tightly screwed into the lower bearing disc and the integrated striker device to form a detonation device, the top of the integrated thread striker device is tightly attached to the lower bearing disc, and the sliding wire of the integrated thread striker device is prevented from falling: setting the initiation point of the detonating device, which is designed according to the depth and pressure of the target layer, the density of the used well killing fluid and the size of the rod throwing object; the initiation point is a pressure point when the impact generated by the heavy bar and the bottom hole pressure difference are greater than the shear strength of the lower pressure bearing disc; (the shear strength of the bearing plate is 6MPa, the pressure of the initiation point is 6MPa, the design is based on the depth of the stratum and the pore pressure of the stratum, the pressure of a hydraulic column generated by the high-density well killing fluid is 5MPa higher than the pore pressure of the stratum, and the impact force generated by the rod throwing object is not less than 1MPa)
(2) The lower packer, the detonating device, the upper packer and the upper sieve tube are sequentially connected with a conventional tubing string and are put into a target layer of a production well;
(3) the upper packer and the lower packer complete setting at the bottom of the well and seal annular spaces of the oil sleeves above and below the target layer;
(4) the method comprises the following steps that a ground pump truck injects low-density well killing fluid into an oil sleeve annulus, the original well killing fluid is gradually and circularly replaced to a wellhead waste liquid recovery tank through an upper screen pipe, a one-way valve of a detonating device is opened in the process, formation methane gas starts to enter a lower wellbore, well killing fluid mixed fluid between an upper packer and a lower packer is gradually discharged through the one-way valve, and when the pump truck injects the low-density well killing fluid from the oil sleeve annulus, the upper screen pipe provides a flow channel for the original well killing fluid to be gradually and circularly replaced to the wellhead waste liquid recovery tank; the one-way valve is closed by the internal and external pressure difference of the detonating device, when low-density killing fluid is injected, the external liquid column pressure is less than the formation pore pressure, formation methane gas starts to enter the lower shaft, and the killing fluid mixed fluid between the upper packer and the lower packer is gradually discharged through the one-way valve; the contact area of two ends of the one-way valve and fluid is as large as that of the two ends of the one-way valve, and the opening of the one-way valve can be controlled by controlling the density of the well killing fluid;
(5) when the wellhead monitoring device finds that hydrocarbon gas is displayed, high-density well killing fluid is immediately injected to close the one-way valve, the gas storage of the cavity of the detonating device and the oil sleeve annulus is finished, and the density of the high-density well killing fluid is larger than that of the low-density well killing fluid;
(6) after the high-density well killing fluid is injected, rod throwing operation is carried out, when the combined action of impact generated by a heavy rod and bottom hole pressure difference on the lower bearing disc is larger than the bearing capacity of the lower bearing disc, the lower bearing disc is broken, the combustion improver impacts the firing pin to detonate methane gas, and the explosion gas flow is ejected at high speed along the hole of the sleeve, so that the stratum is impacted in situ to be fractured;
(7) and after the vertical well methane in-situ combustion and explosion fracturing is finished, lifting the operation pipe column to evaluate the construction effect.
Preferably, in the step (1), the shear strength of a single lower pressure bearing disc is 6MPa, and the pressure of the initiation point can be improved by screwing a plurality of pressure bearing discs according to different construction requirements on site.
Preferably, in the step (4), the density of the low-density well control fluid is in the range of 0.81-1.62 g/cm3The density range of the high-density well killing fluid in the step (5) is 1.4-2.2 g/cm3。
Preferably, in the step (4), the low-density well killing fluid generates a fluid column pressure which is 0.9 times of the pore pressure of the target layer; in the step (5), the pressure of a liquid column generated by the high-density well killing liquid is 5MPa higher than the pore pressure of a target layer.
The shale reservoir stratum is analyzed by the process method, the reservoir stratum is impacted and fractured by high-temperature and high-pressure gas generated by combustion improver and methane gas in cooperation with combustion explosion, a three-dimensional fracture network is created, and in-situ combustion explosion fracturing transformation of reservoir stratum methane is realized. As the processes of ground transportation, underground feeding, mixing and the like of explosives are not adopted, the method has the advantages of safety, economy and obvious environmental protection, and can effectively make up the limitation and the defect of the existing combustion and explosion fracturing technology.
The invention has the beneficial effects that:
1. the adopted new process comprises system equipment consisting of a packer, a sieve tube, a one-way valve, an igniter, a pump truck and the like, and the equipment and the well killing fluids with different densities are matched with a conventional wellhead to throw rods, so that the processes of ground transportation, underground throwing, mixing, injection of displacing fluid and the like of explosives in the combustion and explosion fracturing process are avoided, the combustion improver is independently thrown and the methane gas combustion and explosion fracturing function is separated from the target layer, a three-dimensional fracture network is created, the advantages of safety, economy and environmental protection are obvious, and the limitation and the defect of the existing combustion and explosion fracturing technology are effectively overcome.
2. The adopted combustible is methane gas separated out from the reservoir, the construction process is safe and economic, the environmental protection advantage is obvious, and the range of the explosion and fracturing is wider due to the distribution of the methane gas and the stratum.
3. The adopted detonating device adopts a modular design, the combustion improver holder is placed inside and is fixed with the lower bearing disc through the upper fixing groove, the integrated firing pin device is also firmly contacted with the inside of the tubular column through a screw-in mode, the detonating device can be directly connected to the end part of the oil pipe and goes into the bottom of the well, the detonating device is simple in structure and reasonable in design, and compared with the traditional construction process of a firing tool after the tubular column is put down in the operation of throwing the rod, the construction operation is more convenient.
4. Different types and different forms of combustion improvers and different quantities of lower pressure bearing discs are placed in the special tubular column according to construction requirements so as to correspond to different combustion and explosion effects and different explosion point pressures, and the construction range is wider.
5. The one-way valve is matched with the well killing fluid with different densities, so that methane in the special tubular column cavity is stored.
6. The adopted detonating device has simple structure and reasonable design and can be repeatedly used.
Drawings
FIG. 1 is a construction flow chart of the present invention.
FIG. 2 is an overall schematic diagram of the operation of the vertical well methane in-situ combustion and explosion fracturing device.
FIG. 3 is a schematic structural diagram of a vertical well methane in-situ combustion-explosion fracturing detonating device.
Wherein: 1. a pump truck; 2. a waste liquid recovery tank; 3. a gas monitor; 4. feeding a sieve tube; 5. a detonator device; 6-1, installing a packer; 6-2, setting a packer; 7. an upper joint; 8. a one-way valve; 9. an upper bearing plate; 10. an upper fixing groove; 11. a combustion improver clamper; 12. a combustion improver; 13. a housing through hole; 14. the central through hole at the bottom of the combustion improver clamper; 15. a lower bearing disc; 16. an integrated striker assembly; 17. specially manufacturing a pipe column; 18. screening holes; 19. a lower joint; 20. the central through hole of the lower bearing disc.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
a vertical well methane in-situ combustion and explosion fracturing device suitable for reservoirs of complex shale gas, dense gas and the like comprises an oil pipe device and an explosive device.
The oil pipe device comprises a conventional oil pipe column, an upper packer and a lower packer are arranged at the bottom of the oil pipe column from top to bottom, and an upper sieve pipe is arranged inside the oil pipe column above the upper packer. The vertical distance between the upper sieve tube and the upper packer is 0.5 m.
The detonation device comprises a special pipe column, an upper fixing groove is arranged above the inner wall of the special pipe column, a combustion improver holder is arranged in the middle of the special pipe column, a combustion improver is placed in the combustion improver holder, a sealing tank in the holder can be filled with the combustion improver in solid, liquid and gas states, the combustion improver can be prepared by adopting the conventional method in the field, and the upper fixing groove is used for limiting the upward displacement of the combustion improver holder; an integrated firing pin device is arranged at the bottom of the special tubular column, a firing pin is arranged at the center of the bottom of the integrated firing pin device, a cavity of the firing pin is used for containing methane gas and pressure-bearing disc fragments, and a lower pressure-bearing disc is arranged between the combustion improver clamper and the integrated firing pin device.
The top of the combustion improver holder is provided with two one-way valves, and the one-way valves can only be opened upwards. The shell of the combustion improver holder is provided with shell through holes, and the number of the shell through holes is at least three rows. The combustion improver clamper can be burnt and exploded outwards through the through hole of the shell when falling down and colliding with the firing pin. The center of the bottom of the combustion improver holder and the center of the lower bearing plate are both provided with a central through hole. The side wall of the integrated striker device and the bottom of the special tubular column at the periphery of the integrated striker device are provided with sieve pores.
The formation methane gas is used as a combustible (combustion agent), and the capability of formation in-situ combustion and explosion caused by release of the methane gas contained in the reservoir and independent transportation and injection of the combustion improver is utilized, so that the use of military products is avoided, the method is safe, economical and environment-friendly, the problem of accidental combustion and explosion is well avoided, the formation fracture can be realized in all directions and in multiple ranges, and real network three-dimensional cracks are formed.
Example 2:
the in-situ methane burning and explosion fracturing device for the vertical well is structurally as described in embodiment 1, except that an upper joint is arranged on the top of the inner wall of a special pipe column, the upper joint is an internal thread, a lower joint is arranged at the bottom of the special pipe column, the lower joint is an external thread, and the upper joint and the lower joint are connected with a tubing string.
The interior of the conventional pipe column is hollow and smooth, a channel is provided for fluid migration or shaft bottom tool operation, and a fixing groove and an internal thread are arranged in the specially-produced pipe column in the scheme and can be used for containing a combustion improver holder and the like. Compared with the conventional process of putting the pipe column into the blasting device after blasting operation of throwing the rod, the process has the advantages that the special pipe column fixes the blasting device and then puts the pipe column into the well together, and the operation is more convenient.
Example 3:
the in-situ combustion and explosion fracturing device for vertical well methane is as shown in embodiment 1, and is characterized in that an upper bearing plate is arranged at the top of a combustion improver holder, the upper bearing plate and the combustion improver holder are integrally manufactured, and a one-way valve penetrates through the upper bearing plate and the top of the combustion improver holder. The upper bearing disc is used for increasing the bearing strength of the top surface of the clamp holder, and the clamp holder is enabled to fracture the lower bearing disc when the rod is thrown in the blasting process, so that the top surface of the clamp holder is prevented from being damaged.
Example 4:
the in-situ combustion-explosion fracturing device for the vertical shaft methane is structurally as described in embodiment 1, and is different from a combustion improver clamp holder in that the size of a central through hole at the bottom of the combustion improver clamp holder is the same as that of a central through hole of a lower pressure bearing disc.
Example 5:
the in-situ combustion and explosion fracturing device for the vertical well methane is structurally as described in embodiment 1, except that a lower pressure bearing disc, an integrated striker device and the inner wall of a specially-made tubular column are in threaded connection. Can be fixed in the special pipe column through the knob.
Example 6:
the in-situ methane burning and exploding fracturing device for vertical well has the structure as shown in embodiment 1, except that the vertical interval between the upper sieve pipe and the upper packer is 1.0 m.
Example 7:
the in-situ methane explosion fracturing method for the vertical well adopts the device as described in the embodiment 1, and comprises the following steps of:
(1) and installing a detonating device: and ejecting the combustion improver holder to a special tubular column upper fixing groove, and then tightly screwing the combustion improver holder into the single lower pressure bearing disc and the integrated threaded firing pin device to form a detonating device, and setting a detonating point of the detonating device.
(2) The lower packer, the detonating device, the upper packer and the upper sieve tube are connected with the conventional tubing string in sequence and are put into a target layer of the production well.
(3) And the upper packer and the lower packer complete setting at the bottom of the well, seal annular spaces of the oil sleeves above and below a target layer, and ensure that the upper sieve pore of the oil pipe is just at the position of 0.75m at the upper end of the packer.
(4) The injection density of the ground pump truck from the oil sleeve annulus is not more than 1.35g/cm3The low-density well killing fluid replaces the original well killing fluid to a well head waste liquid recovery tank through an upper screen pipe, a one-way valve of a detonating device is opened in the process, and the formation methane gas begins to enterAnd the lower well bore discharges the mixed fluid of the well killing fluid between the upper packer and the lower packer gradually through the one-way valve.
(5) When the wellhead monitoring device finds that the hydrocarbon gas is displayed, the immediate transfer density is 1.73g/cm3The high-density well killing fluid closes the one-way valve, and the gas storage of the cavity of the detonating device is finished.
(6) And after the high-density well killing fluid is injected, rod throwing operation is carried out, the combined action of impact generated by the heavy rod and the bottom hole pressure difference on the lower bearing disc is greater than the bearing capacity of the lower bearing disc, the lower bearing disc is sheared and broken, the combustion improver impacts the firing pin to detonate methane gas, and the explosion gas flow is ejected at high speed along the hole of the sleeve, so that the stratum is impacted and fractured.
(7) And after the vertical well methane in-situ combustion and explosion fracturing is finished, lifting the operation pipe column to evaluate the construction effect.
In the embodiment, the depth of the well of the target stratum is 2300 meters, the fracture pressure of the stratum is 50MPa, and the pore pressure of the stratum is 34 MPa.
In this embodiment, the individual device dimensions: the inner diameter of the oil pipe is 88.6 mm; the length of the detonating device is 680mm, the maximum inner diameter is 88.6mm, and the outer diameter is 107.95 mm; the length of the combustion improver is 200mm, and the diameter is 50 mm; the thickness of the lower fixed disc is 5mm, the outer diameter is 88.6mm, and the central through hole is 25 mm; the striker has a length of 150 mm.
In the embodiment, the combustible is methane gas in the reservoir, so that the processes of ground transportation, underground putting, mixing and the like of the explosive are avoided, the construction process is safe and economic, and the environmental protection advantage is obvious; the ignition device adopts a modular design, a combustion improver holder is placed in the ignition device and is fixed with the lower pressure bearing disc through an upper fixing groove, the integrated threaded firing pin device is also firmly contacted with the interior of the tubular column through a screwing-in mode, and the ignition device can be directly connected with the end part of the oil pipe, so that construction operation is facilitated; the special pipe column is internally provided with a combustion improver and a lower bearing disc according to construction requirements so as to meet the burning explosion effect and the pressure of a detonation point, and meanwhile, the detonation device is matched with low-density well killing fluid, so that methane in the cavity of the special pipe column is stored, and high-density well killing fluid is matched with rod throwing operation, so that larger impact force is provided for burning explosion of a target layer, and the seepage capability of a stratum is further improved.
Example 8:
the in-situ combustion explosion fracturing method for vertical well methane comprises the steps as described in example 7, except that in the example, the depth of the target layer well is 3000 m, the stratum fracture pressure is 63MPa, the stratum pore pressure is 50MPa, the length of the combustion improver is 240mm, and the density of the low-density well killing fluid is not more than 1.53g/cm3The density of the high-density well killing fluid is not more than 1.87g/cm3。
Example 9:
the in-situ methane burning explosion and fracturing method for vertical well includes the steps as described in example 7, except that in this example, the depth of target well is 4000 m, the stratum fracture pressure is 81MPa, the stratum pore pressure is 55MPa, the length of combustion improver is 280mm, and the density of low-density well killing fluid is not more than 1.26g/cm3The density of the high-density well killing fluid is not more than 1.53g/cm3。
Claims (10)
1. A vertical well methane in-situ combustion-explosion fracturing device is characterized by comprising an oil pipe device and a detonating device,
the oil pipe device comprises an oil pipe column, an upper packer and a lower packer are arranged at the bottom of the oil pipe column from top to bottom, and an upper sieve pipe is arranged inside the oil pipe column above the upper packer;
the detonation device comprises a special pipe column, an upper fixing groove is arranged above the inner wall of the special pipe column, a combustion improver holder is arranged in the middle of the special pipe column, a combustion improver is placed in the combustion improver holder, and the upper fixing groove is used for limiting the upward displacement of the combustion improver holder; an integrated firing pin device is arranged at the bottom of the special tubular column, a lower pressure bearing disc is arranged between the combustion improver holder and the integrated firing pin device, a firing pin is arranged at the center of the bottom of the integrated firing pin device, and a cavity of the firing pin is used for containing methane gas and fragments of the lower pressure bearing disc.
2. The vertical well methane in-situ combustion explosion fracturing device of claim 1, wherein an upper joint is arranged at the top of the inner wall of the specially-made pipe column, the upper joint is an internal thread, a lower joint is arranged at the bottom of the specially-made pipe column, the lower joint is an external thread, and the upper joint and the lower joint are connected with the tubing string;
preferably, the lower pressure bearing disc, the integrated firing pin device and the inner wall of the specially-made tubular column are in threaded connection.
3. The vertical well methane in-situ combustion explosion fracturing device as recited in claim 1, wherein the outer shell of the combustion improver holder is provided with an outer shell through hole;
preferably, the number of housing through holes is at least three rows.
4. The vertical well methane in-situ combustion and explosion fracturing device as claimed in claim 1, wherein the top of the combustion improver holder is provided with one-way valves, preferably, the number of the one-way valves is two;
preferably, the top of the combustion improver holder is provided with an upper bearing plate, the upper bearing plate and the combustion improver holder are integrally manufactured, and the one-way valve penetrates through the upper bearing plate and the top of the combustion improver holder.
5. The vertical shaft methane in-situ combustion-explosion fracturing device as recited in claim 1, wherein the center of the bottom of the combustion improver holder and the center of the lower bearing plate are both provided with a central through hole;
preferably, the size of the central through hole at the bottom of the combustion improver holder is the same as that of the central through hole of the lower bearing disc.
6. The vertical well methane in-situ combustion and explosion fracturing device as claimed in claim 1, wherein the side wall of the integrated firing pin device and the bottom of the special pipe column at the periphery thereof are provided with sieve holes.
7. The vertical well methane in-situ combustion explosion fracturing device as recited in claim 1, wherein the vertical distance between the upper sieve tube and the upper packer is 0.5-1.0 m.
8. A fracturing method by using the vertical well methane in-situ combustion and explosion fracturing device of claim 4, which is characterized by comprising the following steps:
(1) the combustion improver clamper is jacked to a special tubular column upper fixing groove, and then the combustion improver clamper is screwed into the lower pressure bearing disc and the integrated firing pin device to form the detonating device: setting a detonation point of the detonation device, wherein the detonation point is a pressure point when the impact generated by the heavy bar and the bottom hole pressure difference are greater than the shear strength of the lower pressure bearing disc;
(2) the lower packer, the detonating device, the upper packer and the upper screen pipe are sequentially connected with the oil pipe column and are lowered into a target layer of the production well;
(3) the upper packer and the lower packer complete setting at the bottom of the well and seal annular spaces of the oil sleeves above and below the target layer;
(4) injecting low-density well killing fluid into an oil sleeve annulus by a surface pump truck, gradually and circularly replacing the original well killing fluid to a wellhead waste liquid recovery tank through an upper screen pipe, wherein a one-way valve of a detonating device is opened in the process, the formation methane gas starts to enter a lower shaft, and well killing fluid mixed fluid between an upper packer and a lower packer is gradually discharged through the one-way valve;
(5) when the wellhead monitoring device finds that hydrocarbon gas is displayed, high-density well killing fluid is immediately injected to close the one-way valve, the gas storage of the cavity of the detonating device and the oil sleeve annulus is finished, and the density of the high-density well killing fluid is greater than that of the low-density well killing fluid;
(6) after the high-density well killing fluid is injected, rod throwing operation is carried out, when the combined action of impact generated by a heavy rod and bottom hole pressure difference on the lower bearing disc is larger than the bearing capacity of the lower bearing disc, the lower bearing disc is broken, the combustion improver impacts the firing pin to detonate methane gas, and the explosion gas flow is ejected at high speed along the hole of the sleeve, so that the stratum is impacted in situ to be fractured;
(7) and after the vertical well methane in-situ combustion and explosion fracturing is finished, lifting the operation pipe column to evaluate the construction effect.
9. The in-situ combustion explosion fracturing method for vertical well methane according to claim 8, wherein in the step (4), the density of the low-density well killing fluid is in the range of 0.81-1.62 g/cm3The density range of the high-density well killing fluid in the step (5) is 1.4-2.2 g/cm3。
10. The in-situ combustion explosion fracturing method for vertical well methane according to claim 8, wherein in the step (4), the low-density well killing fluid generates a liquid column pressure which is 0.9 times of the pore pressure of the target layer; in the step (5), the pressure of a liquid column generated by the high-density well killing liquid is 5MPa higher than the pore pressure of a target layer.
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