CN117266820B - Hydraulic fracture propagation azimuth control method based on liquid nitrogen cooling reservoir - Google Patents
Hydraulic fracture propagation azimuth control method based on liquid nitrogen cooling reservoir Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 211
- 239000007788 liquid Substances 0.000 title claims abstract description 151
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000001816 cooling Methods 0.000 title claims abstract description 28
- 238000002347 injection Methods 0.000 claims abstract description 98
- 239000007924 injection Substances 0.000 claims abstract description 98
- 238000005553 drilling Methods 0.000 claims abstract description 69
- 239000011148 porous material Substances 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims description 15
- 230000035699 permeability Effects 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 9
- 230000001939 inductive effect Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000644 propagated effect Effects 0.000 claims 2
- 238000001914 filtration Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 238000004891 communication Methods 0.000 abstract description 6
- 239000011435 rock Substances 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 150000003839 salts Chemical class 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 2
- 239000003345 natural gas Substances 0.000 abstract 1
- 238000005755 formation reaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a hydraulic fracture propagation azimuth control method based on a liquid nitrogen cooling reservoir, and belongs to the technical field of hydraulic fracturing of reservoirs; the method is suitable for directional fracturing of unconventional natural gas reservoirs with low water content, dry hot rock and salt rock reservoirs; the local stress field of the reservoir is changed through the temperature gradient generated by low-temperature liquid nitrogen in the liquid injection drilling hole, so that the directional expansion of the hydraulic fracture of the fracturing drilling hole is realized; different from the principle that the water injection changes the pore pressure and the ground stress, based on the characteristic that the heat conduction/heat convection efficiency is higher than that of pure water power conduction, the liquid nitrogen injection is utilized to form a low-temperature low-ground stress area, so that the multiple effects of rapidly and efficiently controlling the expansion direction of the hydraulic fracture, reducing the fracturing construction pump pressure and improving the communication probability of the hydraulic fracture of the long-distance two wells are realized.
Description
Technical Field
The invention belongs to the technical field of hydraulic fracturing of reservoirs, and relates to a hydraulic fracture propagation azimuth control method based on a liquid nitrogen cooling reservoir.
Background
The hydraulic fracturing technology is widely applied to underground coal mine gas extraction, unconventional tight reservoir reconstruction and geothermal exploitation, and good effects are achieved. However, hydraulic fracture propagation is affected by ground stress, formation structure, etc., and is prone to propagation to non-predetermined locations such as roof and floor formations, etc., the hydraulic fracture propagation zone is limited, and the fracturing effect is not ideal. In addition, as the length of the hydraulic fracture increases, the fluid loss of the fracture wall surface increases, resulting in the hydraulic fracture stopping to expand or being easy to expand along the weak structural surface, and the possibility that the hydraulic fractures of the two wells at a long distance are directly communicated is reduced. Therefore, the method for searching the hydraulic fracture directional expansion and effectively communicating the remote well has great application value. Meanwhile, ultralow temperature liquid nitrogen (boiling point-196 ℃ under normal pressure) is also applied to reservoir fracturing, a crack network is formed by utilizing the ultralow temperature cold impact rock characteristic of the ultralow temperature liquid nitrogen, the construction pressure is effectively reduced, and the characteristic of inducing hydraulic crack directional expansion is not researched.
Patent CN 105239984B proposes a method for guiding the propagation of hydraulic fracture to the high pore pressure zone by using the high pore pressure zone generated by pressure maintaining water injection, and does not involve the way of using ultra-low temperature to cool the reservoir and changing the ground stress to induce the directional propagation of hydraulic fracture. Patent CN 104763426B proposes a method for presplitting a thick hard roof of a coal mine by using liquid nitrogen under the coal mine, and inducing rock microcrack/pore expansion by using ultralow temperature liquid nitrogen. Patent CN 107476807A proposes a method of pulsed liquid nitrogen injection and fracture weakening of a hard top plate. Patent CN 111271036B proposes a process method for fracturing a reservoir layer by liquid nitrogen in ground drilling, and adopts a method for pre-cooling a fracturing string in advance to improve the liquid nitrogen conveying efficiency. The liquid nitrogen fracturing patents mainly utilize cold impact to realize complex fracture network, but all the liquid nitrogen fracturing patents do not relate to the content of the ultralow temperature liquid nitrogen cooling reservoir to change the local ground stress field. In addition, water/oil in high water and oil reservoirs will solidify and swell when exposed to liquid nitrogen, and are therefore unsuitable for use with the above-described techniques.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a hydraulic fracture propagation azimuth control method based on a liquid nitrogen cooling reservoir. The hydraulic fracture expansion control method has the advantages of realizing the accurate control of the hydraulic fracture expansion, reducing the construction pump pressure in the fracturing process and improving the communication probability of the hydraulic fractures of the two long-distance wells.
In order to achieve the above purpose, the present invention is realized by the following technical scheme.
A hydraulic fracture propagation azimuth control method based on a liquid nitrogen cooling reservoir comprises the following steps:
step one: drilling a fracturing borehole and a fluid injection borehole into a target reservoir;
step two: injecting liquid nitrogen into the liquid injection drilling hole, pressurizing the liquid injection drilling hole to carry out liquid nitrogen fracturing to form a liquid nitrogen fracturing crack of the liquid injection drilling hole, and forming a liquid nitrogen cooling area around the liquid nitrogen fracturing crack of the liquid injection drilling hole;
step three: carrying out hydraulic fracturing on the fracturing drilling holes, and when the pressure of the pipeline suddenly rises by 1 time of the pressure value of the liquid injection drilling holes, indicating that fracturing cracks of the fracturing drilling holes penetrating through the liquid injection drilling holes are formed at the moment, realizing directional expansion and finishing the fracturing;
in the second step, the pressure of the injected liquid nitrogen is controlled to be two conditions:
first kind: when the connecting line of the fluid injection drilling hole and the fracturing drilling hole is not perpendicular to the minimum ground stressIn the direction of (2) the injection of liquid nitrogen does not take place in the event of a borehole rupture, in which case the injection of liquid nitrogen pressure is ensured +>Is between the pore pressure of the reservoir +.>And wellbore fracture pressure->And (2) the following steps:
wherein the wellbore fracture pressureThe method comprises the following steps:
；
in the above-mentioned method, the step of,maximum and minimum ground stress of the reservoir, respectively, < >>For the thermal expansion coefficient of the reservoir->Young's modulus and Poisson's ratio of the reservoir, respectively, < >>Liquid nitrogen and reservoir temperature, respectively;
second kind: when the connecting line of the fluid injection drilling hole and the fracturing drilling hole is perpendicular to the minimum ground stressIn the direction of (2), liquid nitrogen injection pressureBetween reservoir pore pressure +>And minimum ground stress->And (2) the following steps:
。
preferably, the fracture trend can be influenced by assuming that the temperature disturbance of the liquid nitrogen cooling area propagates to the fracturing drilling hole, and the pressure maintaining critical time of the liquid nitrogen injection hole is calculated according to the heat conduction/convection efficiency of the reservoir:
when reservoir permeability is below 0.001mD,；
when reservoir permeability is above 0.001mD,；
wherein,respectively the radius of the liquid nitrogen injection hole and the ∈10->= 3.1415 is the circumference ratio, +.>For the thermal conductivity of the reservoir->For reservoir permeability, +.>Is viscosity of liquid nitrogen>Is the distance between the fluid-injected borehole and the fracturing borehole.
Preferably, in the second case of step two, the injection borehole is filled with liquid nitrogen until the fracture is expanded to a predetermined length and then the pressure of the injection borehole is maintained, the injection borehole maintaining the pressure within the range of reservoir pore pressureAnd minimum ground stress->And the liquid nitrogen is supplied to the zone to be filtered along the wall surface of the fracture to form a banded liquid nitrogen cooling zone, the ground stress of the zone is reduced, and the fracture of the fracture drilling hole is induced to directionally expand towards the zone with low ground stress.
Preferably, the fracturing drilling hole and the liquid injection drilling hole in the first step adopt horizontal wells, liquid nitrogen is injected into the horizontal section of the liquid injection drilling hole for pressure maintaining, the fracturing drilling hole adopts a staged multi-cluster fracturing process, and the formed fracturing fracture of the fracturing drilling hole directionally expands to a liquid nitrogen cooling area around the liquid nitrogen fracturing fracture (7) of the liquid injection drilling hole.
Preferably, the fracturing drill holes in the first step are uniformly distributed around the center of the liquid injection drill hole, and the fracturing drill hole cracks are induced to directionally expand towards the direction of the liquid injection drill hole in the center.
Preferably, a heat insulation sleeve is put into a shaft of the liquid injection drilling, and cement with low temperature resistance is used for cementing to form a well cementation cement ring; and (3) a target reservoir is isolated by a thermal insulation packer, and annular nitrogen is injected into the upper part of the thermal insulation packer to reduce heat transfer loss.
Preferably, liquid nitrogen is injected into the injection borehole using an insulated tubing.
Compared with the prior art, the invention has the following beneficial effects:
according to the method, the temperature gradient is formed based on the injection of the ultralow-temperature liquid nitrogen into the target layer, the ultralow-temperature low-ground stress area can be formed around the injection hole by injecting the ultralow-temperature liquid nitrogen into the injection hole preset in the reservoir, the hydraulic fracture is induced to expand to the low-temperature area, the characteristics that the heat conduction/convection efficiency is higher than that of pure water force conduction and the gas viscosity is lower are utilized, the reservoir temperature field and the local stress field can be quickly changed, the fracture expansion is further controlled in an efficient and directional mode, the fracturing construction pressure is reduced, and the probability of communication between the two long-distance hydraulic fractures is improved.
Aiming at a hypotonic compact reservoir, the hydraulic conduction rate is lower than the heat conduction rate, and the water injection permeation efficiency is lower than the liquid nitrogen heat transfer efficiency; for a hypertonic reservoir, low-temperature liquid nitrogen can quickly form temperature disturbance through thermal convection and liquid nitrogen seepage. Therefore, compared with water injection seepage control crack extension, the ultra-low temperature liquid nitrogen can quickly change a temperature field and a local stress field, and further efficiently induce the directional extension of the hydraulic crack. According to the invention, the fracturing drilling holes are reasonably arranged at the two sides of the liquid injection drilling hole, the liquid injection is utilized to form a temperature low-temperature region in the reservoir, the ground stress of the temperature disturbance region is reduced, the directional expansion of the hydraulic fracture is realized, and the hydraulic fracture communication efficiency of the two long-distance wells is improved. The method is different from the conventional water injection seepage, and the injected liquid nitrogen forms a low-temperature area in the reservoir and changes a ground stress field so as to influence the hydraulic fracture expansion direction of the fracturing hole.
Drawings
FIG. 1 is a schematic illustration of a drilling arrangement of the present invention;
FIG. 2 is a schematic illustration of the liquid nitrogen cool down zone formed in example 1;
FIG. 3 is a schematic illustration of a method of communicating a fluid injection hole with a fracturing hole fracture of example 2;
FIG. 4 is a schematic illustration of a method of communicating a fluid injection hole with a fracturing hole fracture of example 3;
FIG. 5 is a schematic illustration of a fluid-filled borehole wellbore configuration in accordance with the present invention.
In the figure: 1-liquid injection drilling; 2-fracturing and drilling; 3-formation; 4-target reservoir; 5-a liquid nitrogen cooling area; 6-fracturing a borehole fracturing fracture; 7-liquid injection drilling liquid nitrogen fracturing cracks; 8-fracturing a horizontal section of the borehole; 9-filling a horizontal section of the drilling hole; 10-a well cementing cement sheath; 11-an insulating sleeve; 12-annulus nitrogen; 13-insulating oil pipe; 14-a heat insulation packer; 15-perforation tunnels.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The following describes the technical scheme of the present invention in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
Example 1
The hydraulic fracture propagation azimuth control method based on the liquid nitrogen cooling reservoir provided by the embodiment comprises the following steps:
step one: referring to fig. 1 and 2, according to parameters such as reservoir permeability, heat transfer coefficient, mechanics and the like, drilling a liquid injection drill hole 1 into a target reservoir 4, and arranging four fracturing drill holes 2 around the liquid injection drill hole 1;
step two: referring to fig. 5, a heat insulation sleeve 11 is put into a shaft of a liquid injection borehole 1, and cement is used for cementing with low-temperature cement to form a well cementing cement collar 10; a thermal insulation packer 14 is put down to isolate a target reservoir, and annular nitrogen 12 is injected into the upper part of the thermal insulation packer 14 so as to reduce heat transfer loss;
step three: the injection process uses the insulated tubing 13 to inject liquid nitrogen into the target reservoir 4, forming a liquid nitrogen cooling zone 5 around the injection borehole 1.
When the liquid nitrogen injection operation is performed, the connecting line of the liquid injection drilling hole 1 and the fracturing drilling hole 2 is not perpendicular to the minimum ground stressIn which case no borehole fracture (formation of fracture cracks) can occur during injection of liquid nitrogen, in which case the injection pressure of liquid nitrogen is ensured +.>Is between the pore pressure of the reservoir +.>And wellbore fracture pressure->And (2) the following steps:
wherein the wellbore fracture pressure is considered for thermal stressThe calculation is as follows:
in the above-mentioned method, the step of,maximum and minimum ground stress of the reservoir, respectively, < >>For the thermal expansion coefficient of the reservoir->Young's modulus and Poisson's ratio of the reservoir, respectively, < >>Liquid nitrogen and reservoir temperature, respectively.
Assuming that the crack trend can be affected by the propagation of the temperature disturbance of the liquid nitrogen cooling area 5 to the fracturing borehole 2, calculating the minimum retention time of the single hole according to the thermal conduction/convection of the reservoir:
when reservoir permeability is below 0.001mD,；
when reservoir permeability is above 0.001mD,；
wherein,respectively the radius of the liquid nitrogen injection hole and the ∈10->= 3.1415 is the circumference ratio, +.>For the thermal conductivity of the reservoir->For reservoir permeability, +.>Is viscosity of liquid nitrogen>Is the distance between the injection borehole 1 and the fracturing borehole 2.
Step four: after the injection is completed, the fracturing is immediately carried out on the fracturing drilling hole 2, the fracturing pipeline pressure is monitored, and when the pipeline pressure suddenly rises by 1 time the injection drilling hole pressure value, the fact that the fracturing crack penetrates through the injection drilling hole at the moment is indicated, and then directional expansion is achieved, and the fracturing is completed.
Example 2
The hydraulic fracture propagation azimuth control method based on the liquid nitrogen cooling reservoir provided by the embodiment can be used for hydraulic fracture communication of two remote wells, can be used for reservoirs without water or with less water such as dry hot rock and salt rock, and comprises the following specific steps:
step one: referring to fig. 1 and 3, according to the parameters of reservoir permeability, heat transfer coefficient, mechanics and the like, a liquid injection drill hole 1 is drilled into a target reservoir 4, two fracturing drill holes 2 are respectively arranged on two sides of the liquid injection drill hole 1, and the connecting line of the two holes of the liquid injection drill hole 1 and the fracturing drill hole 2 is perpendicular to the minimum ground stressAnd the two-hole spacing can be increased to 200m.
Step two: referring to fig. 5, a heat insulation sleeve 11 is put into a shaft of a liquid injection borehole 1, and cement is used for cementing with low-temperature cement to form a well cementing cement collar 10; the target reservoir is isolated by the lower heat insulation packer 14, and annular nitrogen 12 is injected into the upper part of the heat insulation packer 14 to reduce heat transfer loss.
Step three: the method comprises the steps of lowering a heat insulation oil pipe 13 into a liquid injection drilling hole 1, injecting liquid nitrogen into a target reservoir 4 by using the heat insulation oil pipe 13, pressurizing the liquid injection drilling hole 1 to carry out liquid nitrogen fracturing, and enabling liquid nitrogen fracturing cracks 7 of the liquid injection drilling hole to be perpendicular to minimum ground stressAfter the liquid injection drilling liquid nitrogen fracturing crack 7 is expanded to 50-100m, maintaining pressure, expanding liquid nitrogen along the crack wall surface to form a strip-shaped liquid nitrogen cooling area 5, and reducing the ground stress in the area through cooling shrinkage. The injection pressure in the pressure maintaining stage is between the pore pressure of the reservoir>And minimum ground stress->And (2) the following steps:
assuming that the crack trend can be affected by the propagation of the temperature disturbance to the fracturing borehole 2, calculating the maximum retention time of the single hole according to the heat conduction/heat convection efficiency of the reservoir:
when reservoir permeability is below 0.001mD,；
when reservoir permeability is above 0.001mD,；
wherein,respectively the radius of the liquid nitrogen injection hole and the ∈10->= 3.1415 is the circumference ratio, +.>For the thermal conductivity of the reservoir->For reservoir permeability, +.>Is viscosity of liquid nitrogen>Is the distance between the injection borehole 1 and the fracturing borehole 2.
Step four: and (3) carrying out fracturing on the liquid injection of the fracturing drilling hole 2, monitoring the pressure of a fracturing pipeline, and when the pressure of the pipeline suddenly rises by 1 time of the pressure value of the liquid injection drilling hole, indicating that a fracturing drilling hole crack 6 penetrating through the fracturing crack 7 of the liquid injection drilling hole is formed at the moment, so that the communication efficiency of the water pressure cracks of the two long-distance wells is realized, and the fracturing is finished.
Example 3
The method of this example is the same as that of example 2, except that the injection borehole 1 and the fracturing borehole 2 are in a horizontal well mode, see fig. 4, and two fracturing borehole horizontal sections 8 are arranged on two sides of the injection borehole horizontal section 9; liquid nitrogen is injected to form a series of stress vertical to the minimum groundLiquid injection drilling liquid nitrogen fracturing crack 7 in the direction; continuously pumping liquid nitrogen to maintain the pressure of the liquid injection drilling hole 7; the fracturing drill hole 2 is used for carrying out staged multi-cluster hydraulic fracturing, the fracturing drill hole fracturing crack 6 is induced to expand towards the liquid injection drill hole liquid nitrogen fracturing crack 7, and directional expansion of the horizontal well mode crack is achieved.
While the invention has been described in detail in connection with specific preferred embodiments thereof, it is not to be construed as limited thereto, but rather as a result of a simple deduction or substitution by a person having ordinary skill in the art to which the invention pertains without departing from the scope of the invention defined by the appended claims.
Claims (7)
1. The hydraulic fracture propagation azimuth control method based on the liquid nitrogen cooling reservoir is characterized by comprising the following steps of:
step one: drilling a fracturing borehole (2) and a fluid injection borehole (1) into a target reservoir (4);
step two: injecting liquid nitrogen into the liquid injection drilling hole (1), pressurizing the liquid injection drilling hole (1) to carry out liquid nitrogen fracturing to form a liquid injection drilling hole liquid nitrogen fracturing crack (7), and forming a liquid nitrogen cooling area (5) around the liquid injection drilling hole liquid nitrogen fracturing crack (7);
step three: carrying out hydraulic fracturing on the fracturing drilling holes (2), and when the pipeline pressure suddenly rises by 1 time of the injection drilling hole pressure value, indicating that fracturing drilling holes fracturing cracks (6) penetrating through the injection drilling holes (1) are formed at the moment, so that directional expansion is realized, and the fracturing is finished;
in the second step, the pressure of the injected liquid nitrogen is controlled to be two conditions:
first kind: when the connecting line of the liquid injection drilling hole (1) and the fracturing drilling hole (2) is not perpendicular to the minimum ground stressIn the direction of (2) the injection of liquid nitrogen does not take place in the event of a borehole rupture, in which case the injection of liquid nitrogen pressure is ensured +>Is between the pore pressure of the reservoir +.>And wellbore fracture pressure->And (2) the following steps:
wherein the wellbore fracture pressureThe method comprises the following steps:
；
in the above-mentioned method, the step of,maximum and minimum ground stress of the reservoir, respectively, < >>In order to provide a thermal expansion coefficient for the reservoir,young's modulus and Poisson's ratio of the reservoir, respectively, < >>Liquid nitrogen and reservoir temperature, respectively;
second kind: when the connecting line of the liquid injection drilling hole (1) and the fracturing drilling hole (2) is perpendicular to the minimum ground stressIn the direction of (2) liquid nitrogen injection pressure +.>Between reservoir pore pressure +>And minimum ground stress->And (2) the following steps:
。
2. the hydraulic fracture propagation azimuth control method based on the liquid nitrogen cooling reservoir according to claim 1, wherein the fracture trend can be influenced by assuming that the temperature disturbance of the liquid nitrogen cooling area (5) propagates to the fracturing drilling hole (2), and the liquid nitrogen injection hole pressure maintaining critical time is calculated according to the heat conduction/convection efficiency of the reservoir:
when reservoir permeability is below 0.001mD,；
when reservoir permeability is above 0.001mD,；
wherein,respectively the radius of the liquid nitrogen injection hole and the ∈10->= 3.1415 is the circumference ratio, +.>For the thermal conductivity of the reservoir->For reservoir permeability, +.>Is viscosity of liquid nitrogen>Is the distance between the fluid-injected borehole and the fracturing borehole.
3. The method for controlling the propagation azimuth of hydraulic cracks based on a liquid nitrogen cooled reservoir according to claim 1, wherein in the second case of the second step, the liquid injection drill hole (1) is filled with liquid nitrogen until the pressure of the liquid injection drill hole (1) is maintained after the crack is propagated to a predetermined length, and the pressure range of the liquid injection drill hole (1) is maintained between the pore pressure of the reservoirAnd minimum ground stress->And (3) supplying liquid nitrogen to the zone (5) for filtering and losing along the wall surface of the fracture to form a strip-shaped liquid nitrogen cooling zone and reducing the ground stress of the zone, and inducing the fracture of the fracture drilling to directionally expand towards the zone with low ground stress.
4. The hydraulic fracture propagation azimuth control method based on the liquid nitrogen cooling reservoir according to claim 1, wherein the fracturing drilling hole (2) and the liquid injection drilling hole (1) in the first step adopt horizontal wells, liquid nitrogen is injected into the horizontal section of the liquid injection drilling hole (1) for pressure maintaining, the fracturing drilling hole (2) adopts a staged multi-cluster fracturing process, and formed fracturing drilling fracture (6) is directionally propagated to a liquid nitrogen cooling area (5) around the liquid injection drilling liquid nitrogen fracturing fracture (7).
5. The hydraulic fracture propagation azimuth control method based on the liquid nitrogen cooling reservoir according to claim 1, wherein the fracturing drill holes (2) in the first step are uniformly distributed around the center of the liquid injection drill hole (1), and the fracturing drill holes are induced to directionally propagate towards the direction of the central liquid injection drill hole (1).
6. The hydraulic fracture propagation azimuth control method based on the liquid nitrogen cooling reservoir according to claim 1, wherein a heat insulation sleeve (11) is put into a shaft of a liquid injection borehole (1), and cement is used for cementing well with low-temperature resistant cement to form a well cementing ring (10); and (3) a thermal insulation packer (14) is arranged in the well to insulate the target reservoir, and annular nitrogen (12) is injected into the upper part of the thermal insulation packer (14) so as to reduce heat transfer loss.
7. A hydraulic fracture propagation azimuth control method based on a liquid nitrogen cooled reservoir according to claim 1, characterized by the fact that liquid nitrogen is injected into the injection borehole (1) using an insulated oil pipe (13).
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