CN113863913A - Shale gas layer oxidation burst transformation method - Google Patents

Shale gas layer oxidation burst transformation method Download PDF

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CN113863913A
CN113863913A CN202111048694.2A CN202111048694A CN113863913A CN 113863913 A CN113863913 A CN 113863913A CN 202111048694 A CN202111048694 A CN 202111048694A CN 113863913 A CN113863913 A CN 113863913A
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slickwater
oxidation
hydrogen peroxide
shale gas
gas layer
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CN113863913B (en
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游利军
程秋洋
钱锐
康毅力
张楠
周洋
陈杨
王福荣
范道全
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Southwest Petroleum University
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Priority to US18/034,073 priority patent/US20240044237A1/en
Priority to PCT/CN2021/132628 priority patent/WO2023035416A1/en
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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
    • 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
    • E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

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Abstract

The invention discloses a shale gas layer oxidation burst transformation method, which comprises the following steps: performing hydraulic fracturing transformation on a shale gas well to be fractured; in the hydraulic fracturing process, slickwater A, an oxidizing solution, gel-containing liquid slickwater, a catalytic decomposition solution and slickwater B are sequentially pumped in a slug type. The invention utilizes the methane gas released by the fracturing of the slickwater A to be mixed with the oxygen generated by the decomposition of the hydrogen peroxide in the oxidizing liquid to induce the oxidative burst, and provides a method for calculating the dosage of the fracturing liquid, the oxidative burst wave and the radius by integrating the physical property characteristics and the chemical thermodynamic property of the shale, thereby realizing safe, efficient and harmless multi-scale yield-increasing transformation of hydraulic cracks, explosive cracks and corrosion cracks.

Description

Shale gas layer oxidation burst transformation method
Technical Field
The invention relates to a new yield-increasing transformation method in the technical field of oil and natural gas exploitation, in particular to a shale gas layer oxidation bursting transformation method.
Background
The shale reservoir has the characteristics of compact base block, strong heterogeneity and the like, the pore throat of the base block mainly comprises nanoscale organic matter pores and clay mineral inter-granular pores, the permeability of the base block is mainly between Nadarcy and Midarcy, the shale gas seepage resistance is large, and adsorption/free gas coexists. Shale gas output needs to be subjected to a desorption-diffusion-seepage series process, however, the desorption-diffusion process of adsorbed gas in nano pores is slow, and free gas diffusion-seepage resistance is large, so that shale gas transmission capacity is extremely low, and an effective yield increase transformation technology is needed.
At present, horizontal well staged hydraulic fracturing is a main yield increasing and modifying means of a shale oil and gas reservoir, a shale base block is broken through hydraulic fracturing, and meanwhile, natural cracks are opened, so that a complex artificial crack network is formed inside a gas layer, the seepage distance of gas from matrix pores to cracks is shortened, the drainage area is increased, and economic development of the shale gas layer is realized. However, shale reservoir recovery is generally low, and shale reservoir recovery is far lower than that of a conventional reservoir, and is only about 10% -16%. The recovery ratio of shale gas layers in North America regions is generally 5% -20%, and particularly the recovery ratio in Barnett regions is only about 10%. From a long-term development perspective, enhanced recovery is an inevitable option for shale oil and gas development.
Secondly, although the fracture network formed by the primary hydraulic fracturing is beneficial to improving the seepage capability of the shale gas layer, the difficult problem of low gas desorption-diffusion transmission capability in the pores of the matrix at the far ends of the fractures still cannot be solved, so that the gas supply capability of the shale matrix is far lower than the gas transmission capability in the fractures, the gas well yield at the initial stage of exploitation is decreased exponentially, the commercial exploitation period is shortened, the recovery ratio is reduced, and the development cost is increased.
Analysis suggests that improving the efficiency of methane gas production in shale-based blocks is primarily an increase in the diffusion rates of adsorbed and free gases. Because the shale base block is compact, the microcracks become the main gas seepage channels, so that more microcracks are generated to shorten the diffusion path of methane gas in nanopores, and the method is a main idea for increasing the yield of the shale gas layer by hydraulic fracturing. The existing research shows that compared with hydraulic support fractures, the contact area between a non-support fracture formed by stress disturbance in the fracturing process and a shale foundation block is larger, the seepage area in a larger range is controlled, and the method has important significance for delaying the rapid decrease of the yield of the shale gas well. Therefore, on the basis of hydraulic fracturing, more unsupported cracks or secondary microcracks are obtained, and the method is one of important breakthrough openings for enhancing the fracturing modification effect and improving the shale gas recovery rate.
Disclosure of Invention
The invention aims to realize secondary reconstruction after shale gas lamination by generating local bursting at a fracturing well section based on the existing hydraulic fracturing technology so as to improve the fracture forming efficiency and the fracture density of the existing fracturing reconstruction method and supplement and enhance the existing fracturing reconstruction effect. In the invention, slickwater A-oxidizing liquid-gel-containing liquid slickwater-catalytic decomposition liquid-slickwater B is plug-injected into the middle section of the well-entering fracturing liquid, and methane gas released by fracturing of slickwater A is mixed with oxygen generated by decomposing hydrogen peroxide in the oxidizing liquid to induce oxidation burst, thereby realizing the effect of rapid, low-cost and harmless yield increase transformation.
The specific technical scheme of the invention is as follows:
a shale gas layer oxidation burst modification method comprises the following steps:
performing hydraulic fracturing transformation on a shale gas well to be fractured;
in the hydraulic fracturing process, slickwater A-oxidizing liquid-gel-containing liquid slickwater-catalytic decomposition liquid-slickwater B are sequentially pumped in a segmented plug type fluid state.
The slickwater A is mainly used for hydraulic fracturing and crack making, and partial methane gas is released;
the oxidizing liquid is a mixed liquid of hydrogen peroxide and dilute hydrochloric acid, and the dilute hydrochloric acid is used for preventing the hydrogen peroxide from decomposing in the shaft;
the injection amount of the glue-containing liquid slickwater is larger than the effective volume of the shaft, so that hydrogen peroxide in the shaft can completely enter a fracturing crack, and a catalytic decomposition agent in the catalytic decomposition liquid and the hydrogen peroxide in the oxidizing liquid can be prevented from reacting in the shaft in advance;
the catalytic decomposition liquid uses slickwater containing catalytic decomposition agent, and the catalytic decomposition agent comprises but is not limited to sodium hydroxide and manganese dioxide;
and the slickwater B seals and separates the oxidizing liquid, so that the local burst in the shale hydraulic fracture is generated at the end far away from the shaft, and the integrity of the shaft is prevented from being damaged.
As a preferred solution, the injection amount of slickwater a is calculated according to the following formula:
Figure BDA0003252025280000031
in the formula, V1Respectively the volume of the slickwater A; alpha is a leakage coefficient, and is 1.0-1.5; d is the outer diameter of the sleeve; delta is the wall thickness of the sleeve; h is the well depth; l is the depth of explosion point; h is the height of a main hydraulic fracture; w is the width of the main fracture of the hydraulic fracture.
Preferably, the oxidizing solution is a mixed solution of hydrogen peroxide and dilute hydrochloric acid.
As a preferred solution, the hydrogen peroxide injection mass and the oxidation burst wave and radius are calculated according to the following formula:
Figure BDA0003252025280000032
in the formula, PoIs the original formation pressure; sigma is rock tensile strength; phi is the compact gas layer porosity; r is the oxidation explosion wave radius; r is an ideal gas constant; zoIs the pre-oxidation decrepitation gas compression factor; zmIs a gas compression factor after oxidation explosion; t isoIs the original formation temperature, K; m is the hydrogen peroxide injection mass; mH2O2Is the molar mass of hydrogen peroxide; mCH4Is the molar mass of methane; c is the specific heat capacity of methane; q is the heating value of methane when the product is gaseous water.
As a preferred technical scheme, according to a calculation formula of the hydrogen peroxide injection mass and the oxidation burst wave sum radius, the hydrogen peroxide injection mass m is given, a unitary high-order equation of the oxidation burst wave sum radius r is obtained, and the unitary high-order equation of the oxidation burst wave sum radius r is solved to obtain the oxidation burst wave sum radius r;
or, according to a calculation formula of the hydrogen peroxide injection mass and the oxidation burst wave sum radius, giving the oxidation burst wave sum radius r to obtain a unitary high-order equation of the hydrogen peroxide injection mass m, and solving the unitary high-order equation of the hydrogen peroxide injection mass m to obtain the hydrogen peroxide injection mass m.
Preferably, the injection amount of the rubber-containing liquid slickwater is larger than the effective volume of the well bore.
As a preferred technical scheme, the injection amount of the slickwater containing glue solution is calculated according to the following formula:
Figure BDA0003252025280000033
in the formula, V2Is the slippery water volume of the glue-containing liquid; beta is a safety coefficient, and is 1.0-1.5; d is the outer diameter of the sleeve; delta is the sleeve wall thickness.
Preferably, the catalytic decomposition solution is prepared by adding a catalytic decomposition agent to the slick water, wherein the catalytic decomposition agent includes, but is not limited to, sodium hydroxide and manganese dioxide.
As a preferable embodiment, the injection amount of the catalytic decomposition liquid is calculated according to the following formula:
Figure BDA0003252025280000041
in the formula, V4Is a catalytic decomposition liquid; rho is the density of the slick water; and m is the hydrogen peroxide injection mass.
As a preferable technical scheme, the slickwater B is used for packing the oxidizing liquid, so that local bursting in a shale hydraulic fracture is generated at the end far away from a shaft, and the integrity of the shaft is prevented from being damaged;
calculating the injection amount of the slickwater B according to the following formula:
Figure BDA0003252025280000042
in the formula, V3Is the volume of slickwater B; d is the outer diameter of the sleeve; delta is the wall thickness of the sleeve; h is the well depth; l is the depth of explosion point; h is the height of a main hydraulic fracture; w is the width of the main fracture of the hydraulic fracture.
Has the advantages that:
(1) increasing the seam web density and complexity. Based on the artificial fractures formed by hydraulic fracturing, oxidative decrepitation further increases fracture density and depth, thereby forming a denser network of spherical fractures.
(2) The construction operation is convenient and safe. In the hydraulic fracturing process, the fracturing fluid is injected into a reservoir layer together with the conventional fracturing fluid in a segmented mode, and the oxidation burst is generated in the hydraulic fracture far away from a shaft due to the reasonable injection amount of the fracturing fluid.
(3) Fully utilizes chemical energy and has low economic cost. The composite action of high temperature and high pressure generated by explosion of combustible gas is combined to calculate the range of oxidative burst so as to provide guidance for process implementation, and meanwhile, the hydrogen peroxide solution is widely applied to multiple links of petroleum exploration and development, is relatively low in price, and effectively controls the economic cost of fracturing yield increase.
(4) The method is established on the existing hydraulic fracturing shale gas well, additional drilling is not needed, the required energy is derived from the oxygen generated by the decomposition of the hydrocarbon gas in the reservoir and the hydrogen peroxide, the exploitation cost of the shale oil gas is reduced, and the hydraulic fracturing reformation effect is further improved. When the scale of the same hydraulic fracturing is compared, the oxidative burst is cooperated with the hydraulic fracturing modification, so that the modification volume (SRV) of the reservoir is favorably improved; for a deeper shale gas reservoir (more than 3500m), under the condition of poor hydraulic fracturing effect, the invention provides a new idea for effective development of deep shale gas.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic illustration of the inflow of a working fluid during staged hydraulic fracturing of a horizontal well in a shale gas formation according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a fracturing fluid influx and oxygen generation process after a first stage of hydraulic fracturing in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of a first stage shale gas layer oxidation decrepitation modification in accordance with an embodiment of the present invention;
in the figure, a-shale gas layer; b-slickwater B; c-catalyzing the decomposition liquid; d-slick water containing glue liquid; e-oxidizing liquid; f-slickwater A; g-bridge plug; h-horizontal well; i-hydraulic fracturing the main fracture; j-oxidizing liquid and catalytic decomposing liquid; k-oxide fracture network.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention will now be further described with reference to the accompanying drawings.
As shown in figure 1, the shale gas layer horizontal well is subjected to hydraulic fracturing modification according to the invention, working fluid entering the well is injected in a slug type in sequence, slickwater A (figure 1f) is pumped in an early stage to perform hydraulic fracturing modification (figure 2), conditions are created for sufficient contact between the subsequently injected oxidizing fluid (figure 2e) and the catalytic decomposition fluid (figure 2c) in the artificial fracturing, and the slickwater containing glue (figure 2d) is used for separating the oxidizing fluid and the catalytic decomposition fluid in a shaft. The oxidizing fluid is then displaced into the fracture by pumping slickwater B (fig. 3B) to keep the oxidative burst detonation away from the wellbore. Considering the pumping action during the fracturing, the methane content in the artificial fracturing is constant, when the oxygen amount generated by catalytic decomposition of the hydrogen peroxide solution reaches the range required by shale oxidation and explosion, the mixed gas of methane and oxygen detonates at high temperature and high pressure to crack a shale base block to generate an explosion and fracture network (figure 3K), and secondary reconstruction of a reservoir is realized.
Considering the difference in explosion limits when methane is mixed with different gases: the explosion limit of methane in air is about 5-15% at normal temperature and normal pressure; whereas in pure oxygen the explosion limit of methane is about 5.0% to 61%; the molecular thermal motion is more violent under high temperature and high pressure, the explosion limit of the methane-air mixture is 2.87% -64.40% at the temperature of 100 ℃ under 20MPa, and the explosion theoretical critical oxygen content can be reduced to 5.74%. The injection amount of the hydrogen peroxide can be adjusted to reach the ratio value required by methane explosion.
In the embodiment of the invention, the amount of the fracturing fluid required by the oxidation burst is calculated by taking a deep shale gas well of the Longmaxi group in the Sichuan basin as an example.
(1) Slick water A
The using amount of the slickwater A is determined according to the position of an explosion point and the shape of a hydraulic fracture and is adjusted according to a small fracturing test.
Figure BDA0003252025280000071
In the formula, V1Respectively is the volume of slickwater A, m3(ii) a Alpha is the leakage coefficient, and is 1.0-1.5; d is the outer diameter of the sleeve, m; delta is the sleeve wall thickness, m; h is the well depth, m; l is the detonation depth, m; h is the height of a hydraulic fracture main crack, m; w is the width of the main fracture of hydraulic fracturing, m.
The outer diameter of the casing is 139.7mm, the wall thickness is 12.7mm, the well bore is 5100m, the depth of a first explosion point is 70m, the height of a hydraulic fracturing main crack is 20m, the width of the hydraulic fracturing main crack is 0.03m, and the dosage of slickwater A is 164m3。
(2) Oxidizing liquid and oxidation burst spread
The oxidizing liquid is a mixed liquid of hydrogen peroxide and dilute hydrochloric acid (the mass concentration of the hydrogen peroxide is 20%), and the oxidation explosion occurs by two steps of mixed combustion reaction of oxygen, oxygen and methane generated by the decomposition of the hydrogen peroxide. The hydrogen peroxide injection mass determines the sweep range, namely the radius of the oxidation explosion fracture network, the maximum explosion pressure generated when the mixture explodes can be determined by the relationship that the pressing force is in direct proportion to the thermodynamic temperature and the mole number, and the hydrogen peroxide injection mass and the oxidation explosion sweep range are calculated as follows:
Figure BDA0003252025280000072
in the formula, PoIs the original formation pressure, Pa; sigma is tensile strength of the rock, Pa; phi is the compact gas layer porosity; r is the oxidation explosion wave radius, Pa; r is an ideal gas constant, 8.314 J.mol-1·K-1；ZoIs the pre-oxidation decrepitation gas compression factor; zmIs a gas compression factor after oxidation explosion; t isoIn order to be the temperature of the virgin formation,k; m is the hydrogen peroxide injection mass, g; mH2O2Hydrogen peroxide molar mass, 34 g/mol; mCH4Is the molar mass of methane, 16 g/mol; c is the specific heat capacity of methane, and is 2.227 kJ/(kg. K); q is the calorific value of methane when the product is gaseous water, 50200 kJ/kg.
According to the formula, given m, a unary high-order equation of r is obtained and solved through a dichotomy.
In the example, the original formation pressure was 66.8MPa, the tensile strength of the rock after hydration was 6.3MPa, the original formation temperature was 393K, the average porosity was 4.17%, the gas compression factors before and after the oxidation burst were 1.2, the amount of the oxidizing solution was 5000kg (1000 kg of hydrogen peroxide), and the oxidation burst wave radius was 8.5 m.
(3) Slippery water containing glue solution
The glue-containing solution slickwater is used for squeezing the oxidizing solution into the stratum from the shaft and preventing the hydrogen peroxide from reacting with the catalyst in the shaft, and the using amount of the hydrogen peroxide is 1.2 times of the volume of the shaft.
Figure BDA0003252025280000081
In the formula, V2Is the slick water volume of the gel-containing solution, m3(ii) a Beta is a safety coefficient and is 1.0-1.5.
The parameters are the same as those in the slickwater A, and the dosage of the slickwater containing the glue is 63m3。
(4) Catalytic decomposition liquid
The catalytic decomposing liquid uses slickwater containing catalytic decomposing agent, the volume of which is the same as that of the oxidizing liquid, and the catalytic decomposing agent includes but is not limited to sodium hydroxide and manganese dioxide.
Figure BDA0003252025280000082
In the formula, V4M is a catalytic decomposition liquid3(ii) a Rho is the density of slick water, kg/m3。
The density of the slick water is 1000kg/m35m of catalytic decomposition liquid3。
(5) Slick water B
And the slickwater B is used for displacing hydrogen peroxide and a catalyst into the crack, so that an oxidation burst wave and a shaft are avoided, and the integrity of the shaft is protected.
Figure BDA0003252025280000083
In the formula, V3Is the volume of slickwater B, m3。
The other parameters are the same as those in the slickwater A, and the dosage of the slickwater B is 136m3。
According to the calculation method provided by the invention, the total dosage of the oxidative burst fracturing fluid is 373m3And an oxidation explosion crack net is respectively generated at the positions of 70m on two wings of the shaft, and the radius of the crack net is 8.5 m.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims (10)

1. The shale gas layer oxidation burst transformation method is characterized by comprising the following steps: the method comprises the following steps:
performing hydraulic fracturing transformation on a shale gas well to be fractured;
in the hydraulic fracturing process, slickwater A, an oxidizing solution, gel-containing liquid slickwater, a catalytic decomposition solution and slickwater B are sequentially pumped in a slug type.
2. The shale gas layer oxidation burst modification method of claim 1, wherein: the charge of slickwater a was calculated according to the following formula:
Figure FDA0003252025270000011
in the formula, V1Is the volume of slickwater A; alpha is a leakage coefficient, and is 1.0-1.5; d is the outer diameter of the sleeve; delta is the wall thickness of the sleeve; h is the well depth; l is the depth of explosion point; h is the height of a main hydraulic fracture; w is the width of the main fracture of the hydraulic fracture.
3. The shale gas layer oxidation decrepitation modification method of claim 1, wherein: the oxidizing solution is a mixed solution of hydrogen peroxide and dilute hydrochloric acid.
4. The shale gas layer oxidation burst modification method of claim 1, wherein: the hydrogen peroxide implant mass and the oxidation burst wave and radius were calculated according to the following formula:
Figure FDA0003252025270000012
in the formula, PoIs the original formation pressure; sigma is rock tensile strength; phi is the compact gas layer porosity; r is the oxidation explosion wave radius; r is an ideal gas constant; zoIs the pre-oxidation decrepitation gas compression factor; zmIs a gas compression factor after oxidation explosion; t isoIs the original formation temperature, K; m is the hydrogen peroxide injection mass; mH2O2Is the molar mass of hydrogen peroxide; mCH4Is the molar mass of methane; c is the specific heat capacity of methane; q is the heating value of methane when the product is gaseous water.
5. The shale gas layer oxidation burst modification method of claim 4, wherein: according to a calculation formula of the hydrogen peroxide injection mass and the oxidation burst wave sum radius, giving the hydrogen peroxide injection mass m, obtaining a unitary high-order equation of the oxidation burst wave sum radius r, and solving the unitary high-order equation of the oxidation burst wave sum radius r to obtain the oxidation burst wave sum radius r;
or, according to a calculation formula of the hydrogen peroxide injection mass and the oxidation burst wave sum radius, giving the oxidation burst wave sum radius r to obtain a unitary high-order equation of the hydrogen peroxide injection mass m, and solving the unitary high-order equation of the hydrogen peroxide injection mass m to obtain the hydrogen peroxide injection mass m.
6. The shale gas layer oxidation burst modification method of claim 1, wherein: the injection amount of the glue-containing liquid slickwater is larger than the effective volume of the shaft.
7. The shale gas layer oxidation decrepitation modification method of claim 1 or 6, wherein: the amount of the slick water to be injected was calculated according to the following formula:
Figure FDA0003252025270000021
in the formula, V2Is the slippery water volume of the glue-containing liquid; beta is a safety coefficient, and is 1.0-1.5; d is the outer diameter of the sleeve; delta is the sleeve wall thickness.
8. The shale gas layer oxidation burst modification method of claim 1, wherein: the catalytic decomposition liquid is prepared by adding a catalytic decomposition agent including, but not limited to, sodium hydroxide and manganese dioxide to the slipwater.
9. The shale gas layer oxidation burst modification method of claim 4, wherein: calculating the injection amount of the catalytic decomposition liquid according to the following formula:
Figure FDA0003252025270000022
in the formula, V4Is a catalytic decomposition liquid; rho is the density of the slick water; m is peroxyThe hydrogen oxide implant mass.
10. The shale gas layer oxidation burst modification method of claim 1, wherein: the slickwater B is used for packing the oxidizing liquid, so that the local bursting in the shale hydraulic fracture is generated at the end far away from the shaft, and the integrity of the shaft is prevented from being damaged;
calculating the injection amount of the slickwater B according to the following formula:
Figure FDA0003252025270000023
in the formula, V3Is the volume of slickwater B; d is the outer diameter of the sleeve; delta is the wall thickness of the sleeve; h is the well depth; l is the depth of explosion point; h is the height of a main hydraulic fracture; w is the width of the main fracture of the hydraulic fracture.
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CN202111048694.2A CN113863913B (en) 2021-09-08 2021-09-08 Shale gas layer oxidation burst transformation method
US18/034,073 US20240044237A1 (en) 2021-09-08 2021-11-24 Method of shale gas reservoir stimulation by oxidation-induced rock burst
PCT/CN2021/132628 WO2023035416A1 (en) 2021-09-08 2021-11-24 Shale gas layer oxidative burst transformation method
US18/764,271 US20240360746A1 (en) 2021-09-08 2024-07-04 Shale gas formation oxidation induced rock burst stimulation method

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Cited By (4)

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CN114718539A (en) * 2022-05-12 2022-07-08 中国石油大学(华东) In-situ combustion and explosion fracturing method in multi-turn methane layer
CN114989804A (en) * 2022-06-28 2022-09-02 西南石油大学 Method for determining using amount of oxidizing liquid based on fracturing modification effect of shale gas layer
CN115324552A (en) * 2022-09-21 2022-11-11 中国石油天然气集团有限公司 Fracturing and crack-making method based on chemical reaction and reservoir fracturing modification method
CN117514103A (en) * 2023-11-30 2024-02-06 中国矿业大学 Multistage transformation methane in-situ blasting fracturing and combustion improver conveying method

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