CN115419387B - Underground power-on assisted shale reservoir methane in-situ combustion and explosion fracturing device and method - Google Patents
Underground power-on assisted shale reservoir methane in-situ combustion and explosion fracturing device and method Download PDFInfo
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- CN115419387B CN115419387B CN202211373161.6A CN202211373161A CN115419387B CN 115419387 B CN115419387 B CN 115419387B CN 202211373161 A CN202211373161 A CN 202211373161A CN 115419387 B CN115419387 B CN 115419387B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 238000004880 explosion Methods 0.000 title claims abstract description 61
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002485 combustion reaction Methods 0.000 title claims description 34
- 230000005540 biological transmission Effects 0.000 claims abstract description 54
- 238000012806 monitoring device Methods 0.000 claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 84
- 229910052751 metal Inorganic materials 0.000 claims description 74
- 239000002184 metal Substances 0.000 claims description 74
- 238000005485 electric heating Methods 0.000 claims description 71
- 238000004146 energy storage Methods 0.000 claims description 61
- 239000007788 liquid Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000010276 construction Methods 0.000 claims description 15
- 239000002360 explosive Substances 0.000 claims description 15
- 230000009466 transformation Effects 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 8
- 230000035939 shock Effects 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000004200 deflagration Methods 0.000 claims 2
- 239000007789 gas Substances 0.000 description 25
- 239000010410 layer Substances 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 7
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 238000005422 blasting Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000005474 detonation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001120 nichrome Inorganic materials 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910001006 Constantan Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001131 transforming effect Effects 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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- 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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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses a methane in-situ explosion fracturing device and method for an underground electrified auxiliary shale reservoir, wherein the methane in-situ explosion fracturing device comprises a ground control system, an electric energy transmission system and an underground operation device, the ground control system is arranged on the ground and comprises a ground control device and a ground variable-voltage power supply device, the ground control device comprises a ground monitoring device and an electric control switch, the electric control switch is electrically connected with the ground variable-voltage power supply device, the ground monitoring device is arranged on the ground and is used for monitoring the gas exhaust condition of a wellhead, the ground monitoring device is also provided with a wellhead safety device, the electric energy transmission system comprises a power transmission cable, the power transmission cable is arranged in a continuous oil pipe and is connected with the ground control system, the power transmission cable is used for transmitting alternating current to the underground, and the continuous oil pipe is used for extending into a target reservoir.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development, and particularly relates to an underground electrified auxiliary shale reservoir methane in-situ combustion and explosion fracturing device and method.
Background
The shale gas reservoir is compact, the seepage resistance in the reservoir is large, the conventional hydraulic fracturing is difficult to realize the efficient reservoir transformation in the shale reservoir, generally only single-form cracks can be formed, and the three-dimensional complex fracture network is difficult to manufacture.
Along with the gradual emphasis on unconventional natural gas resources such as shale gas and the like, new requirements are also put forward on the fracturing technology. In addition to minimizing reservoir damage and environmental pollution, the volume of fracturing modification is more important. Shale methane in-situ combustion-explosion fracturing is a novel reservoir transformation technology, and is characterized in that a combustion improver is injected to the bottom of a well, methane gas separated out in situ from the reservoir is mixed, and the methane gas is detonated in a shaft space or a near-well stratum to complete fracturing construction. In actual development, water content in shale gas reservoir production is high, a water layer and a gas layer generally exist in a shaft space at the same time, gas and water co-production conditions cannot greatly influence fracturing construction in general shale well hydraulic fracturing, but in methane in-situ combustion and explosion fracturing construction, a large amount of liquid in the shaft space can compress a methane-combustion improver gas mixing space, combustion and explosion power is reduced, meanwhile, an underground ignition device is easily influenced by the existence of the water layer, mixed gas is extremely likely to be not detonated, and great construction risk exists; the shale reservoir is compact, the pore throat radius is small, the seepage resistance is large, the natural productivity of the gas well is low or has no natural productivity, and the methane gas naturally separated out from the reservoir is insufficient to complete the combustion-explosion fracturing construction aiming at a new well which is not subjected to reservoir transformation in the early stage.
Disclosure of Invention
Therefore, the invention aims to provide a device and a method for assisting methane in-situ combustion and explosion fracturing of a shale reservoir by underground electrification, and aims to solve or partially solve the problems.
In order to achieve the above object, the present invention provides a methane in-situ combustion and explosion fracturing device for assisting a shale reservoir by downhole energization, comprising:
the ground control system is arranged on the ground and comprises a ground control device and a ground voltage transformation power supply device, the ground control device comprises a ground monitoring device and an electric control switch, the electric control switch is electrically connected with the ground voltage transformation power supply device, the ground monitoring device is arranged on the ground and used for monitoring the gas exhaust condition of a wellhead, and the ground monitoring device is also provided with a wellhead safety device;
the electric energy transmission system comprises a power transmission cable, the power transmission cable is arranged in the coiled tubing and is connected with the ground control system, the power transmission cable is used for transmitting alternating current to the underground, and the coiled tubing is used for extending into a target reservoir;
the underground operation device comprises an underground packing and fixing system, an electronic rectifier, a metal energy storage electric heating system and an electric explosion wire energy converter, wherein the underground packing and fixing system comprises an upper packer, an oil pipe plug and a lower packer, the upper packer is sleeved on a continuous oil pipe, the metal energy storage electric heating system is installed at one end of the continuous oil pipe and is connected with a power transmission cable, the lower packer is installed at one end of the metal energy storage electric heating system opposite to the continuous oil pipe, the electronic rectifier is contained in the continuous oil pipe and is close to the end of the continuous oil pipe, the electronic rectifier is electrically connected with the metal energy storage electric heating system, the oil pipe plug is detachably plugged at one end of the continuous oil pipe, and the electric explosion wire energy converter is used for being installed at an eyelet.
Preferably, in the downhole power-on auxiliary shale reservoir methane in-situ combustion and explosion fracturing device, the ground variable-voltage power supply device comprises a ground high-power generator and a step-up transformer, the power control switch is electrically connected with the ground high-power generator, one end of the step-up transformer is electrically connected with the high-power generator, and the other end of the step-up transformer is electrically connected with one end of the power transmission cable.
Preferably, in the methane in-situ combustion and explosion fracturing device for the underground electrified auxiliary shale reservoir, the electric energy transmission system further comprises an insulation protection device, the insulation protection device comprises a first part and a second part, the first part is arranged between the coiled tubing and the power transmission cable, and the second part is positioned in the metal energy storage electric heating system to isolate electric heating wires in the metal energy storage electric heating system.
Preferably, in the underground power-on assisted shale reservoir methane in-situ combustion-explosion fracturing device, the first part is made of silicon rubber, and is resistant to temperature of more than 220 ℃ and pressure of more than 35 MPa; and/or the presence of a gas in the gas,
the second part is made of magnesium oxide, can resist temperature of over 600 ℃ and resist pressure of over 45 MPa.
Preferably, in the methane in-situ combustion and explosion fracturing device for the underground electrified auxiliary shale reservoir, the underground packing and fixing system further comprises a fixer, and the fixer is positioned at the upper part of the lower packer and is used for fixing the metal energy storage electric heating system;
the metal energy storage electric heating system comprises a protective pipe, a plurality of metal heating wires and an insulating protective layer, the upper end of the protective pipe is connected with one end of the continuous oil pipe, the electricity transmission cable penetrates through the protective pipe and is electrically connected with the metal heating wires, and the metal heating wires are installed inside the fixator and are in liquid production contact with the stratum.
Preferably, in the underground power-on auxiliary shale reservoir methane in-situ combustion and explosion fracturing device, the metal heating wire is made of nichrome; the protective pipe is made of alloy steel.
In order to achieve the above object, the present invention further provides a fracturing method using the above downhole electrification assisted shale reservoir methane in-situ combustion and explosion fracturing device, which comprises the following steps:
perforating a target reservoir and arranging an electric explosive wire energy converter at the perforation position of the perforation;
installing a power transmission cable, a lower packer, a metal energy storage electric heating system, an upper packer and an oil pipe plug on a continuous oil pipe, placing the continuous oil pipe to a target reservoir, setting through the upper packer, the lower packer and the oil pipe plug and enclosing to form a closed target shaft space, wherein the power transmission cable penetrates through the continuous oil pipe, the metal energy storage electric heating system is installed at one end part of the continuous oil pipe and connected with the power transmission cable, the lower packer is installed at one end of the metal energy storage electric heating system opposite to the continuous oil pipe, and the oil pipe plug blocks one end part of the continuous oil pipe;
the ground voltage transformation power supply device supplies power and boosts the voltage, and high-voltage direct current is transmitted to an electronic rectifier in the target storage layer through the power transmission cable;
the high-voltage direct current is transmitted to the metal energy storage electric heating system, and a power supply switch is controlled to be rapidly switched to realize pulse compression, so that the electric energy of the metal energy storage electric heating system is instantaneously released to the stratum output liquid in the shaft;
pulse electricity is transmitted to the electric explosive wire energy converter at the perforation hole through stratum produced fluid, so that high-temperature plasma and shock waves formed by the combination of electric explosive wires of the electric explosive wire energy converter and a liquid electric effect convert electric energy into mechanical energy, and the shock waves act on a target reservoir stratum to perform pre-fracturing;
stopping power supply of the ground variable-voltage power supply device after electric explosion is completed, removing an oil pipe plug of the continuous oil pipe, continuously supplying high-voltage power to the ground variable-voltage power supply device, heating the metal energy storage electric heating system to continuously heat, vaporize and expand produced liquid in a target shaft space of a target reservoir stratum, discharging the produced liquid through the continuous oil pipe, and treating separated water vapor and partial methane gas through a ground monitoring device;
and testing the gas-water distribution in the target shaft space.
Preferably, in the fracturing method, the step of perforating the target reservoir and placing an electrical explosive wire energy converter at the perforation location of the perforation comprises:
carrying the perforating gun and the electric explosive wire energy converter to a target reservoir layer through a continuous oil pipe, and completing perforation through the perforating gun;
installing the electrical blast wire energy converter at an eyelet location.
Preferably, in the fracturing method, the step of stopping the power supply of the ground variable-voltage power supply device after the electrical explosion is completed, removing an oil pipe plug of the coiled tubing, continuously supplying power to the ground variable-voltage power supply device at a high voltage, heating the metal energy storage electric heating system to continuously heat, vaporize and expand produced liquid in a target wellbore space of a target reservoir, discharging the produced liquid through the coiled tubing, and treating the separated water vapor and part of methane gas through the ground monitoring device includes:
stopping the power supply of the ground variable-voltage power supply device after the electric explosion is finished, and throwing a rod from a well mouth of the shaft to remove an oil pipe plug of the coiled oil pipe;
the ground variable-voltage power supply device supplies power continuously at high voltage, the metal energy storage electric heating system heats up, so that produced liquid in a target shaft space of a target reservoir is heated, vaporized and expanded continuously, the produced liquid is discharged through the continuous oil pipe, and the separated water vapor and part of methane gas are processed through the ground monitoring device.
Preferably, in the fracturing method, the step of testing the gas-water distribution in the target wellbore space comprises:
and (3) putting a sampler into a wellhead of the shaft, testing the gas-water distribution in the target shaft space through the sampler, and judging whether the construction requirement of methane in-situ combustion and explosion fracturing is met, wherein after the construction is finished, the power transmission cable can be used for the next-step methane in-situ combustion and explosion fracturing electric ignition, and the metal energy storage electric heating system can be kept open all the time before the combustion improver is put down in the combustion and explosion fracturing.
The invention has the following beneficial effects:
the invention provides an underground electrification auxiliary shale reservoir methane in-situ combustion-explosion fracturing device which comprises a ground control system, an electric energy transmission system and an underground operation device, wherein high voltage is transmitted through a power transmission cable, a metal electric guide wire and a perforation hole electric explosion wire energy converter are preset underground, and the integrated process target of pre-seam-well shaft drainage is realized;
furthermore, the electric explosion wire is detonated by pulse electricity, so that the target reservoir of the gas well without/with low natural productivity is pre-fractured, sufficient free methane gas is provided for subsequent methane in-situ combustion and explosion fracturing, and the process adaptability is improved; through electric heating, the water produced by the reservoir in the preset detonation space is vaporized and expanded, and is discharged to the wellhead through the continuous oil pipe, so that a methane gas and combustion improver gas mixing space is provided for subsequent methane in-situ combustion and detonation fracturing, and the process effect and the safety are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of an embodiment of the methane in-situ combustion and explosion fracturing device for a downhole electrified auxiliary shale reservoir provided by the invention.
1-an electric control switch, 2-a ground high-power generator, 3-a step-up transformer, 4-an electric transmission cable, 5-a ground monitoring device, 6-an upper packer, 7-an electronic rectifier, 8-an electric explosive wire energy converter, 9-a metal energy storage electric heating system, 10-a fixer and 11-a lower packer.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The term "and/or" in the embodiments of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The term "plurality" in the embodiments of the present invention means two or more, and other terms are similar thereto.
To make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present invention. However, the claimed invention may be practiced without these specific details or with various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.
The invention provides an underground electrification assisted shale reservoir methane in-situ combustion and explosion fracturing device, which comprises a ground control system, an electric energy transmission system and an underground operation device, and please refer to fig. 1. Wherein the content of the first and second substances,
ground control system locates ground and includes ground control device and ground vary voltage power supply unit, ground control device includes ground monitoring devices 5, accuse electric switch 1 with ground vary voltage power supply unit electric connection, ground monitoring devices 5 are located ground and are used for monitoring the well head condition of exhausting, ground monitoring devices 5 still are equipped with well head safety device, and well head safety device can prevent that high temperature vapor or methane from leaking in the well head and causing the construction risk. The ground voltage transformation power supply device is used for providing electric energy for an underground operation system and completing voltage boosting so as to reduce line loss, improve the economical efficiency of power transmission and achieve the aim of long-distance power transmission, and comprises a ground high-power generator 2 and a boosting transformer 3, wherein the power control switch 1 is electrically connected with the ground high-power generator 2, and the power control switch 1 controls the ground voltage transformation power supply device to be started and closed to realize pulse power supply. One end of the step-up transformer 3 is electrically connected with the high-power generator, and the other end is electrically connected with one end of the power transmission cable 4.
The electric energy transmission system comprises a power transmission cable 4, the power transmission cable 4 is arranged in the coiled tubing and connected with the ground control system, the power transmission cable 4 is used for transmitting alternating current to the underground, and the coiled tubing is used for extending into a target reservoir. The electric energy transmission system further comprises an insulation protection device (not shown in the figure), the insulation protection device comprises a first part and a second part, the first part is arranged between the continuous oil pipe and the power transmission cable 4, the second part is positioned in the metal energy storage electric heating system 9 to isolate the electric heating wire in the metal energy storage electric heating system 9, and the electric leakage in the construction process is placed through the electric heating wire isolating the metal energy storage electric heating system 9 and the fixing device for fixing the electric heating wire. The first part is made of silicon rubber, and is resistant to temperature of more than 220 ℃ and pressure of more than 35 MPa. The second part is made of magnesium oxide, can resist temperature of over 600 ℃ and resist pressure of over 45 MPa.
The underground operation device comprises an underground packing and fixing system, an electronic rectifier 7, a metal energy storage electric heating system 9 and an electric explosive wire energy converter 8, wherein the underground packing and fixing system comprises an upper packer 6, an oil pipe plug, a fixer 10 and a lower packer 11, the whole underground packing and fixing system is lowered to a target reservoir from a continuous oil pipe, the upper packer 6 is sleeved on the continuous oil pipe, the metal energy storage electric heating system 9 is installed at one end of the continuous oil pipe and is connected with a power transmission cable 4, the lower packer 11 is installed at one end of the metal energy storage electric heating system 9 opposite to the continuous oil pipe, the electronic rectifier 7 is contained in the continuous oil pipe and is close to the end of the continuous oil pipe, the electronic rectifier 7 is electrically connected with the metal energy storage electric heating system 9, the oil pipe plug detachably plugs one end of the continuous oil pipe, and is sealed and encloses a closed target shaft space through the upper packer 6, the lower packer 11 and the oil pipe plug. The target shaft space is sealed through the upper packer 6 and the lower packer 11, the coiled tubing is plugged by the tubing plug in the pre-crack stage, steam is prevented from entering the shaft, and the metal energy storage electric heating system 9 is fixed by the fixing device 10. The electrical explosive wire energy converter 8 is intended to be mounted at an eyelet.
More specifically, a holder 10 is located in the upper part of the lower packer 11 and holds the metal stored energy electric heating system 9; metal energy storage electric heating system 9 includes pillar, many metal heating wire (for example resistance), insulating protective layer, the upper end of pillar with a tip connection of coiled tubing, pass electric cable 4 and pass the pillar and with many metal heating wire electric connection, many metal heating wire install the inside of fixer 10 and with the contact of stratum production liquid. The metal heating wire is used as a power transmission device in the pre-seam-forming stage, pulse power is transmitted to the electric explosion wire energy converter 8 through stratum produced liquid, the metal heating wire is used as a heat production device in the shaft drainage stage, electric energy is converted into heat energy, and redundant produced liquid of the stratum is vaporized. The insulation protection layer is located inside the protective tube and inside the holder 10, is resistant to high temperature and leakage, and can conduct heat. The electric explosion wire energy converter 8 can generate solid, liquid, gas and plasma state rapid phase transformation in a short time after the current density reaches the explosion condition, the resistance value rapidly rises to cut off the current and then electric explosion occurs to form shock waves, and an anti-reverse breakdown diode is arranged in the converter to prevent the shock waves from reversely entering a shaft. In this embodiment, the metal heating wire is made of nichrome; the protective pipe is made of alloy steel.
Wherein, the material of the metal heating wire (resistor) is nickel-chromium alloy, and the diameter, the number and the length of the heating wire are designed according to the target layer bit length and the water content of the produced liquid; the protective pipe is made of alloy steel; the electric explosion wire is a constantan wire with the diameter of 0.05 mm.
In this embodiment, the electronic rectifier 7 is a rectifying silicon stack, is located at the end of the coiled tubing, and can convert the transmitted high-voltage alternating current into direct current, so as to facilitate efficient pulse transmission to detonate the electric explosion wire and heat the metal heating wire in the metal energy storage electric heating system 9.
The invention also provides a fracturing method of the pulse-assisted shale reservoir methane in-situ blasting fracturing device by utilizing the underground electrification, and the embodiment of the pulse-assisted shale reservoir methane in-situ blasting fracturing method comprises all the embodiments of the pulse-assisted shale reservoir methane in-situ blasting fracturing device.
The pulse assisted shale reservoir methane in-situ combustion and explosion fracturing method comprises the following steps:
step S210, perforating the target reservoir and arranging an electric explosive wire energy converter 8 at the perforation position of the perforation;
specifically, step S210 includes: carrying the perforating gun and the electric explosive wire energy converter 8 to a target reservoir layer through a continuous oil pipe, and completing perforation through the perforating gun; the electrical explosive wire energy converter 8 is mounted at the location of the perforation.
Step S220, installing a power transmission cable 4, a lower packer 11, a metal energy storage electric heating system 9, an upper packer 6 and an oil pipe plug on a coiled oil pipe, placing the coiled oil pipe to a target reservoir, setting through the upper packer 6, the lower packer 11 and the oil pipe plug and enclosing to form a closed target shaft space, wherein the power transmission cable 4 is arranged in the coiled oil pipe in a penetrating manner, the metal energy storage electric heating system 9 is arranged at one end part of the coiled oil pipe and connected with the power transmission cable 4, the lower packer 11 is arranged at one end of the metal energy storage electric heating system 9 opposite to the coiled oil pipe, and the oil pipe plug blocks one end part of the coiled oil pipe;
it should be noted that step S220 is executed after the perforating gun needs to be lifted up after step S210 is completed.
More specifically, step S220 further includes installing an insulation protection device, wherein the insulation protection device includes a first portion and a second portion, the first portion is disposed between the coiled tubing and the power transmission cable 4, the second portion is located in the metal energy storage electric heating system 9 to isolate the electric heating wire in the metal energy storage electric heating system 9, and electric leakage during construction is prevented by isolating the electric heating wire of the metal energy storage electric heating system 9 from the fixing device for fixing the electric heating wire.
More specifically, the step S220 includes:
after the perforating gun is lifted up, connecting the power transmission cable 4, the lower packer 11, the metal energy storage electric heating system 9, the upper packer 6 and the oil pipe plug to the continuous oil pipe, and arranging the insulation protection system between the continuous oil pipe and the power transmission cable 4;
and (3) lowering the coiled tubing to a target reservoir, completing setting of the upper packer 11 and the lower packer 11, positioning the metal energy storage electric heating system 9 on the lower packer 11, and positioning the tubing plug at the upper packer 6 to form a closed target shaft space.
Step S230, the ground transformation power supply device supplies power and boosts the voltage, and high-voltage direct current is transmitted to an electronic rectifier 7 in a target storage layer through the power transmission cable 4;
more specifically, the step S230 includes supplying power by a surface transformation power supply device, transmitting high-voltage direct current to the underground through a cable after boosting by the step-up transformer 3, and passing through the underground electronic rectifier 7 (rectifier silicon stack).
It should be noted that, the specific boosting value of the ground transforming power supply device for supplying and boosting power is not particularly limited. The boosting by the booster transformer 3 is mainly considered to reduce loss, and therefore, specific values of the boosting are not particularly limited herein.
Step S240, transmitting the high-voltage direct current to the metal energy storage electric heating system 9, and controlling a power supply switch to rapidly switch to realize pulse compression so as to instantly release the electric energy of the metal energy storage electric heating system 9 to the stratum output liquid in the shaft;
it should be noted that the power supply switch is controlled to be rapidly switched to realize pulse compression, so that the electric energy of the metal energy storage electric heating system 9 can be instantaneously released to the stratum production liquid in the shaft for setting.
Because the metal energy storage electric heating system 9 is used as an energy storage capacitor at this stage, the shaft space contains more water at this moment, methane explosion and fracturing are difficult to carry out, the high-voltage direct current is transmitted to the metal energy storage electric heating system 9, meanwhile, the ground manually controls the quick switching of the power supply switch to realize pulse compression, and the electric energy stored by the device is instantly released to the stratum production liquid in the shaft in a short time.
Step S250, pulse electricity is transmitted to the electric explosion wire energy converter 8 at the perforation hole through stratum produced liquid, so that high-temperature plasma and shock waves formed by the electric explosion wires of the electric explosion wire energy converter 8 in combination with a liquid electricity effect convert electric energy into mechanical energy, and the shock waves act on a target reservoir stratum to perform pre-fracturing;
in the stage, the space pressure of the target shaft is high, the oil pipe plug is pressed on the coiled tubing above the target shaft by the pressure difference, and the coiled tubing is sealed.
Step S260, stopping power supply of the ground variable-voltage power supply device after electric explosion is finished, removing an oil pipe plug of the continuous oil pipe, continuously supplying high-voltage power to the ground variable-voltage power supply device, heating the metal energy storage electric heating system 9 to enable produced liquid in a target shaft space of a target reservoir to be continuously heated, vaporized and expanded, discharging the produced liquid through the continuous oil pipe, and processing separated water vapor and partial methane gas through the ground monitoring device 5;
specifically, step S260 includes: stopping the power supply of the ground variable-voltage power supply device after the electric explosion is finished, and removing an oil pipe plug of the continuous oil pipe by throwing a rod (or adopting valve control) at a well mouth of a shaft; the ground variable-voltage power supply device supplies power continuously at high voltage, an electric heating wire of the metal energy storage electric heating system 9 heats up, so that produced liquid in a target shaft space of a target reservoir is heated, vaporized and expanded continuously, the produced liquid is discharged through the continuous oil pipe, and separated water vapor and partial methane gas are treated through the ground monitoring device 5.
And step S270, testing the gas-water distribution in the target shaft space.
Specifically, step S270 includes setting a sampler into the wellhead of the wellbore, testing the gas-water distribution in the target wellbore space through the sampler, and determining whether the requirement for methane in-situ combustion and explosion fracturing construction is met, wherein after the construction is completed, the power transmission cable 4 can be used for next-step methane in-situ combustion and explosion fracturing electric ignition, and the metal energy storage electric heating system 9 can be kept open all the time before the combustion improver is set down in the combustion and explosion fracturing, so as to avoid the influence caused by continuous water production in the formation during the fracturing construction process.
It is to be understood that the above-described embodiments are only a few, and not all, embodiments of the present invention. Based on the embodiments of the present invention, those skilled in the art may make other variations or modifications without creative efforts, and shall fall within the protection scope of the present invention.
Claims (8)
1. The utility model provides an in situ combustion and explosion fracturing device of supplementary shale reservoir methane of circular telegram in pit which characterized in that includes:
the ground control system is arranged on the ground and comprises a ground control device and a ground voltage transformation power supply device, the ground control device comprises a ground monitoring device and an electric control switch, the electric control switch is electrically connected with the ground voltage transformation power supply device, the ground monitoring device is arranged on the ground and used for monitoring the gas exhaust condition of a wellhead, and the ground monitoring device is also provided with a wellhead safety device;
the electric energy transmission system comprises a power transmission cable, the power transmission cable is arranged in the coiled tubing and is connected with the ground control system, the power transmission cable is used for transmitting alternating current to the underground, and the coiled tubing is used for extending into a target reservoir;
the underground operation device comprises an underground packing and fixing system, an electronic rectifier, a metal energy storage electric heating system and an electric explosion wire energy converter, wherein the underground packing and fixing system comprises an upper packer, an oil pipe plug and a lower packer, the upper packer is sleeved on a continuous oil pipe, the metal energy storage electric heating system is installed at one end part of the continuous oil pipe, the lower packer is installed at one end, opposite to the continuous oil pipe, of the metal energy storage electric heating system, the electronic rectifier is accommodated in the continuous oil pipe and close to the end part of the continuous oil pipe, the electronic rectifier is electrically connected with the metal energy storage electric heating system, the oil pipe plug detachably plugs one end part of the continuous oil pipe, and the electric explosion wire energy converter is used for being installed at an eyelet;
the electric control switch is used for rapidly switching to realize pulse compression so as to instantly release the electric energy of the metal energy storage electric heating system to the stratum production liquid in the shaft.
2. The in-situ methane deflagration fracturing device for shale reservoirs assisted by downhole energization according to claim 1, wherein the surface voltage transformation power supply device comprises a surface high-power generator and a step-up transformer, the electricity control switch is electrically connected with the surface high-power generator, one end of the step-up transformer is electrically connected with the high-power generator, and the other end of the step-up transformer is electrically connected with one end of the electricity transmission cable.
3. The downhole power-assisted shale reservoir methane in-situ deflagration fracturing device of claim 1, wherein the power transmission system further comprises an insulation protection device, the insulation protection device comprising a first portion and a second portion, the first portion being disposed between the coiled tubing and the power transmission cable, the second portion being disposed within the metal energy storage electric heating system to isolate an electric heating wire of the metal energy storage electric heating system.
4. The in-situ methane combustion-explosion fracturing device for the underground electrified auxiliary shale reservoir as claimed in claim 3, wherein the first part is made of silicon rubber, and is resistant to temperature of more than 220 ℃ and pressure of more than 35 MPa; and/or the presence of a gas in the atmosphere,
the second part is made of magnesium oxide, can resist temperature of over 600 ℃ and resist pressure of over 45 MPa.
5. A fracturing method of the methane in-situ combustion and explosion fracturing device for the shale reservoir by utilizing the downhole power-on auxiliary according to any one of claims 1 to 4, characterized by comprising the following steps:
perforating a target reservoir and arranging an electric explosive wire energy converter at the perforation position of the perforation;
installing a power transmission cable, a lower packer, a metal energy storage electric heating system, an upper packer and an oil pipe plug on a continuous oil pipe, placing the continuous oil pipe to a target reservoir, setting through the upper packer, the lower packer and the oil pipe plug and enclosing to form a closed target shaft space, wherein the power transmission cable penetrates through the continuous oil pipe, the metal energy storage electric heating system is installed at one end part of the continuous oil pipe, the lower packer is installed at one end of the metal energy storage electric heating system opposite to the continuous oil pipe, and the oil pipe plug blocks one end part of the continuous oil pipe;
the ground voltage transformation power supply device supplies power and boosts the voltage, and high-voltage alternating current is transmitted to an electronic rectifier in the target storage layer through the power transmission cable;
the high-voltage direct current is transmitted to the metal energy storage electric heating system, and an electric control switch is controlled to be rapidly switched to realize pulse compression so as to instantly release the electric energy of the metal energy storage electric heating system to the stratum output liquid in the shaft;
pulse electricity is transmitted to the electric explosion wire energy converter at the perforation hole through stratum produced fluid, so that high-temperature plasma and shock waves are formed through the electric explosion wires of the electric explosion wire energy converter in combination with a liquid electric effect, electric energy is converted into mechanical energy, and the shock waves act on a target reservoir stratum to perform pre-fracturing;
stopping power supply of the ground variable-voltage power supply device after electric explosion is completed, removing an oil pipe plug of the continuous oil pipe, continuously supplying high-voltage power to the ground variable-voltage power supply device, heating the metal energy storage electric heating system to continuously heat, vaporize and expand produced liquid in a target shaft space of a target reservoir stratum, discharging the produced liquid through the continuous oil pipe, and treating separated water vapor and partial methane gas through a ground monitoring device;
and testing the gas-water distribution in the target shaft space.
6. The method of fracturing of claim 5 wherein the step of perforating the target reservoir and positioning an electrical explosive wire energy converter at the perforation location of the perforation comprises:
carrying the perforating gun and the electric explosive wire energy converter to a target reservoir layer through a continuous oil pipe, and completing perforation through the perforating gun;
installing the electrical blast wire energy converter at an eyelet location.
7. The fracturing method according to claim 5, wherein the step of stopping the power supply of the ground variable-voltage power supply device after the electric explosion is completed, removing the oil pipe plug of the coiled tubing, continuously supplying high-voltage power to the ground variable-voltage power supply device, heating the metal energy storage electric heating system to ensure that produced fluid in the target shaft space of the target reservoir is continuously heated, vaporized and expanded and is discharged through the coiled tubing, and processing the separated water vapor and part of methane gas through the ground monitoring device comprises the following steps:
stopping the power supply of the ground variable-voltage power supply device after the electric explosion is finished, and throwing a rod from a well mouth of the shaft to remove an oil pipe plug of the coiled oil pipe;
the ground variable-voltage power supply device supplies power continuously at high voltage, the metal energy storage electric heating system heats up, so that produced liquid in a target shaft space of a target reservoir is heated, vaporized and expanded continuously, the produced liquid is discharged through the continuous oil pipe, and the separated water vapor and part of methane gas are processed through the ground monitoring device.
8. The fracturing method of claim 5, wherein the step of testing the gas-water distribution in the target wellbore space comprises:
and (3) putting a sampler into a wellhead of the shaft, testing the gas-water distribution in the target shaft space through the sampler, and judging whether the construction requirement of methane in-situ combustion and explosion fracturing is met, wherein after the construction is finished, the power transmission cable can be used for the next-step methane in-situ combustion and explosion fracturing electric ignition, and the metal energy storage electric heating system is kept open all the time before the combustion improver is put down in the combustion and explosion fracturing.
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