CN111410948A - Temperature response type phase change fracturing fluid and application method thereof - Google Patents
Temperature response type phase change fracturing fluid and application method thereof Download PDFInfo
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- CN111410948A CN111410948A CN201911399069.5A CN201911399069A CN111410948A CN 111410948 A CN111410948 A CN 111410948A CN 201911399069 A CN201911399069 A CN 201911399069A CN 111410948 A CN111410948 A CN 111410948A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/885—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Abstract
The invention relates to the technical field of hydraulic fracturing, and provides a temperature response type phase change fracturing fluid and a using method thereof for solving the problems that the existing hydraulic fracturing technology needs to inject a solid-phase propping agent into a stratum, the process is complex to implement, and fracturing fluid residues pollute a reservoir and block fractures, wherein the temperature response type phase change fracturing fluid consists of the following components in percentage by mass: 20-50% of functional oil phase and 50-80% of functional water phase. The temperature response type phase change fracturing fluid can realize temperature control phase change, changes into a solid material by virtue of covalent bonds and non-covalent bonds, has specific strength and support property, and does not need to add other solid phase proppants; the temperature response type phase-change fracturing fluid can realize a hydraulic fracturing construction process without injecting a solid-phase proppant, effectively reduces construction risks and potential safety hazards, and is suitable for fracturing transformation and yield increase of oil and gas field reservoirs.
Description
Technical Field
The invention relates to the technical field of hydraulic fracturing, in particular to a temperature response type phase change fracturing fluid and a using method thereof.
Background
The hydraulic fracturing technology is an important technology for reservoir transformation, is widely applied to the technical links of increasing production and transformation of low-permeability reservoirs, improving the yield of oil and gas wells and the like, and provides important guarantee for the stable yield of oil and gas fields. The fracturing fluid can form an artificial seepage channel with a certain length in an oil and gas reservoir, and a fracture formed by fracturing needs to have a stable geometric form and high flow conductivity.
The existing hydraulic fracturing technology has more or less the following problems: the process is complex, and the requirement on construction equipment is high; the proppant is uniformly laid, and the flow conductivity of the crack is limited; fracturing fluid residues contaminate reservoirs, plug fractures, and the like. The fracture conductivity of the high-speed channel flow of the HIWAY proposed by the Chonblack corporation in 2010 is not influenced by the permeability of the proppant, compared with the conventional fracturing technology, the technology has great technical progress, but the solid-phase proppant needs to be injected into the stratum, and the process is complex to implement. Petroleum workers are always researching and searching for a fracturing fluid which is simple and convenient to construct.
Disclosure of Invention
The invention provides a temperature response type phase change fracturing fluid which can realize temperature control phase change and has certain strength and supporting performance, and aims to solve the problems that the existing hydraulic fracturing technology needs to inject a solid-phase propping agent into a stratum, the process implementation is complex, and fracturing fluid residues pollute a reservoir and block cracks.
The invention also provides a use method of the temperature response type phase change fracturing fluid, which is simple to operate, has no solid phase injection, and can effectively reduce construction risks and potential safety hazards.
In order to achieve the purpose, the invention adopts the following technical scheme:
the temperature response type phase change fracturing fluid consists of the following components in percentage by mass: 20-50% of functional oil phase and 50-80% of functional water phase. The functional oil phase is a phase-change fracturing part, and the functional water phase is a non-phase-change fracturing fluid part.
The invention provides a temperature response type phase-change fracturing fluid system, wherein the phase-change fracturing fluid is prepared on the ground, is low-viscosity flowing liquid and is easy to pump into a stratum, after the phase-change fracturing fluid enters a reservoir and reacts at the reservoir temperature of 60-120 ℃ for 10-180 min, functional materials in the phase-change fracturing fluid form a solid-phase material with certain strength by utilizing covalent bond actions such as free radical addition, cycloaddition and the like and supermolecule actions such as hydrogen bonds, pi-pi accumulation, hydrophilic-hydrophobic actions and the like, and the support of cracks is realized. The responsive phase-change fracturing fluid system is used for phase-change fracturing construction, is simple, convenient, safe and efficient to operate, and has a wide market prospect.
Preferably, the functional oil phase is selected from one or more of unsaturated polyester, divinylbenzene, styrene, polyethylene glycol, vinyl acetate, glycidyl methacrylate, dibenzoyl peroxide (BPO), di-tert-butyl peroxide (DTO) and Azobisisobutyronitrile (AIBN).
Preferably, the functional water phase is a complex system of one or more of polyvinyl alcohol, polyethylene glycol, sodium dodecyl benzene sulfonate, cetyl trimethyl ammonium bromide and ammonium persulfate and water.
Preferably, the concentration of the functional water phase is 1-6 wt%.
Preferably, the phase transition temperature of the temperature response type phase transition fracturing fluid is 60-120 ℃.
A use method of a temperature response type phase change fracturing fluid comprises the following steps:
(1) respectively preparing a functional oil phase and a functional water phase on the ground according to the proportion, and uniformly mixing to obtain a temperature response type phase change fracturing fluid;
(2) and (2) injecting the temperature response type phase change fracturing fluid obtained in the step (1) into a stratum, and along with the rise of the temperature of the stratum, when the temperature rises to the phase change temperature, rapidly raising the viscosity of the temperature response type phase change fracturing fluid to form a solid phase material, realizing the support of the fracture and finishing the phase change fracturing.
In the hydraulic fracturing construction, the stratum is firstly pressed by conventional fracturing fluid, then the phase-change fracturing fluid prepared on the ground is injected into the stratum, or the functional oil phase and the functional water phase (including stratum water, river water, seawater and conventional fracturing fluid) are injected into the stratum together. The phase-change fracturing fluid is mixed with formation water, river water, seawater, conventional fracturing fluid and the like, so that the properties of the phase-change fracturing fluid are basically not changed, the construction process is simple and convenient, and the efficient fracturing effect is achieved.
The invention provides a use method of a temperature response type phase change fracturing fluid, which is a hydraulic fracturing construction process without injecting a solid-phase proppant, can improve the fracturing construction effect and has the following principle: injecting special fracturing fluid capable of changing phase based on temperature response into the stratum, wherein the fracturing fluid on the ground is flowable low-viscosity liquid, and after the fracturing fluid is injected into the stratum and reaches the phase change temperature, a solid-phase material with a stable structure and a plurality of pores is formed in 10-180 min, so that the wall surface of a stratum fracture is supported, a channel with high flow conductivity is realized, and phase change fracturing is completed.
Preferably, in the step (2), the phase transition temperature is 60-120 ℃.
Preferably, in the step (2), the solid phase material has a porous channel structure.
Preferably, in the step (2), the bulk density of the solid phase material is 0.46 to 0.51g/cm3。
Preferably, in the step (2), the apparent density of the solid phase material is 1.04-1.05 g/cm3。
The development of fracturing propping agents in the prior art is always the best low-density propping agent (the bulk density of the conventional propping agent is about 1.2-1.6 g/cm)3The apparent density is about 2.7-3 g/cm3). The solid-phase material formed by the temperature response type phase-change fracturing fluid after phase change has low solid-phase density, high strength and low crushing rate after bearing pressure, and is not easy to deposit towards the bottom of a crack in a stratum. The fracturing fluid can bear pressure under the condition of a stratum, can completely support fractures, and enables the fractured reservoir to have higher flow conductivity.
Therefore, the invention has the following beneficial effects:
(1) the temperature response type phase change fracturing fluid can realize temperature control phase change, changes into a solid material by virtue of covalent bonds and non-covalent bonds, has specific strength and support property, and does not need to add other solid phase proppants;
(2) the temperature response type phase-change fracturing fluid can realize a hydraulic fracturing construction process without injecting a solid-phase proppant, effectively reduces construction risks and potential safety hazards, and is suitable for fracturing transformation and yield increase of oil and gas field reservoirs.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples.
In the present invention, all the equipment and materials are commercially available or commonly used in the art, and the methods in the following examples are conventional in the art unless otherwise specified.
Example 1
Firstly, 10g of unsaturated polyester is taken, then styrene (2g), glycidyl methacrylate (3g) and BPO (0.15g) are respectively added into the unsaturated polyester and stirred uniformly, and the preparation of a functional oil phase GOP1 is completed; and (3) taking 30g of mineralized water, and adding polyvinyl alcohol (0.5g) and sodium dodecyl benzene sulfonate (1g) to complete the preparation of the functional water phase GWP1 with the concentration of 5 wt%.
Mixing and stirring 50% GOP1 and 50% GWP1 uniformly in a beaker to obtain a phase change fracturing fluid PCF1, placing the mixture in a constant temperature oil bath kettle, heating to 80-90 ℃ for reaction for 0.5-3 hours, stopping heating, taking out the beaker, and observing uniform beads and a few blocky solid phase substances in a PCF1 sample, which shows that the phase change fracturing fluid PCF1 can be used for phase change fracturing and can realize the conversion from a liquid phase to a solid phase.
Example 2
Firstly, 10g of unsaturated polyester is taken, then styrene (2g), vinyl acetate (2g), glycidyl methacrylate (4g) and BPO (0.15g) are respectively added into the unsaturated polyester and stirred uniformly, and the preparation of a functional oil phase GOP2 is completed; and (3) taking 30g of mineralized water, and adding polyvinyl alcohol (0.5g), sodium dodecyl benzene sulfonate (1g) and ammonium persulfate (0.5g) to complete the preparation of the functional water phase GWP2 with the concentration of 6 wt%.
And (3) mixing and stirring 20% GOP2 and 80% GWP2 uniformly in a beaker to obtain a phase change fracturing fluid PCF2, putting the mixture into a constant-temperature oil bath kettle, heating to 90-100 ℃ for reaction for 0.5-3 hours, stopping heating, taking out the beaker, and observing uniform beads and a few blocky solid phase substances in a PCF2 sample, wherein the solid phase substances have a porous structure, which indicates that the phase change fracturing fluid PCF2 can be used for phase change fracturing and can realize the conversion from a liquid phase to a solid phase.
Example 3
Firstly, 10g of unsaturated polyester is taken, then vinyl acetate (2g), divinylbenzene (1g), glycidyl methacrylate (4g) and BPO (0.15g) are respectively added into the unsaturated polyester and stirred uniformly, and the preparation of the functional oil phase GOP3 is completed; and (3) taking 30g of mineralized water, and adding polyvinyl alcohol (0.5g), sodium dodecyl benzene sulfonate (1g) and ammonium persulfate (0.5g) to complete the preparation of the functional water phase GWP3 with the concentration of 6 wt%.
And (3) mixing and stirring 30% GOP3 and 70% GWP3 uniformly in a beaker to obtain a phase change fracturing fluid PCF3, putting the mixture into a constant-temperature oil bath kettle, heating to 60-80 ℃ for reaction for 0.5-3 hours, stopping heating, taking out the beaker, and observing uniform beads and a few blocky solid phase substances in a PCF3 sample, so that the phase change fracturing fluid PCF3 can be used for phase change fracturing and can realize the conversion from a liquid phase to a solid phase.
Example 4
Firstly, 10g of unsaturated polyester is taken, then vinyl acetate (2g), divinylbenzene (1g), glycidyl methacrylate (4g) and di-tert-butyl peroxide (0.10g) are respectively added into the unsaturated polyester and stirred uniformly, thus finishing the preparation of the functional oil phase GOP 4; and (3) taking 200g of mineralized water, and adding polyvinyl alcohol (0.5g), sodium dodecyl benzene sulfonate (1g) and ammonium persulfate (0.5g) to complete the preparation of the functional water phase GWP4 with the concentration of 1 wt%.
And (3) mixing and stirring 40% GOP4 and 60% GWP4 uniformly in a beaker to obtain a phase change fracturing fluid PCF4, putting the mixture into a constant-temperature oil bath kettle, heating to 110-120 ℃ for reaction for 0.5-3 hours, stopping heating, taking out the beaker, and observing uniform beads and a few blocky solid phase substances in a PCF4 sample, so that the phase change fracturing fluid PCF4 can be used for phase change fracturing and can realize the conversion from a liquid phase to a solid phase.
Comparative example 1
The difference between the comparative example 1 and the example 1 is that the phase-change fracturing part (functional oil phase) is 60 percent, the non-phase-change fracturing fluid part (functional water phase) is 40 percent, and the rest processes are completely the same.
And (3) placing the phase change fracturing fluid in the comparative example 1 into a constant temperature oil bath, heating to 80-90 ℃ and reacting for 0.5-3 hours to stop heating. Under general conditions, the volume of the phase-change fracturing part (functional oil phase) should be less than or equal to the volume of the non-phase-change fracturing fluid part (functional water phase). In the comparative example, the volume of the oil phase is increased, and the phenomenon that the shape and the size of particles are not uniform after phase change, adhesion occurs and even local pasty agglomeration occurs can be obviously observed; the pressure-bearing strength of the particles is less than that of the embodiment, the crushing rate is high, and the engineering requirements cannot be met.
The properties of the solid phase materials after the phase change fracturing of examples 1 to 4 and comparative example 1 were measured, and the results are shown in table 1:
TABLE 1 test results
The data in table 1 show that the solid phase material after phase change has low solid phase density and is not easy to deposit to the bottom of the fracture in the stratum. For a long time, the development of fracturing proppants has been the most demanding low density proppant (the bulk density of conventional proppants is about 1.2-1.6 g/cm)3The apparent density is about 2.7-3 g/cm3) The temperature response type phase change fracturing fluid provided by the invention has extremely low solid phase density for realizing support in phase change and low breaking rate after bearing pressure, and can completely realize supporting of fractures if bearing pressure is carried out under the condition of a stratum, so that a fractured reservoir has high flow conductivity. The solid phase performance after the phase change fracturing liquid phase change of the comparative example 1 and the phase change fracturing liquid phase change of the comparative example 1 shows that the proportion of the phase change fracturing part and the non-phase change fracturing liquid part is critical, the volume of the phase change fracturing part (functional oil phase) is smaller than or equal to that of the non-phase change fracturing liquid part (functional water phase), otherwise, the particle strength is reduced due to severe polymerization reaction because the phase change of the oil phase releases heat violently, and the requirement of low breakage rate cannot be met.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (10)
1. The temperature response type phase change fracturing fluid is characterized by comprising the following components in percentage by mass: 20-50% of functional oil phase and 50-80% of functional water phase.
2. The temperature-responsive phase-change fracturing fluid of claim 1, wherein the functional oil phase is one or more selected from unsaturated polyester, divinylbenzene, styrene, polyethylene glycol, vinyl acetate, glycidyl methacrylate, dibenzoyl peroxide, di-tert-butyl peroxide and azobisisobutyronitrile.
3. The temperature-responsive phase-change fracturing fluid of claim 1, wherein the functional water phase is a complex system of one or more of polyvinyl alcohol, polyethylene glycol, sodium dodecyl benzene sulfonate, cetyl trimethyl ammonium bromide and ammonium persulfate and water.
4. The temperature-responsive phase-change fracturing fluid as claimed in claim 1, wherein the concentration of the functional aqueous phase is 1-6 wt%.
5. The temperature-responsive phase-change fracturing fluid as claimed in claim 1, wherein the phase-change temperature of the temperature-responsive phase-change fracturing fluid is 60-120 ℃.
6. A method of using the temperature responsive phase change fracturing fluid of any of claims 1 to 4, comprising the steps of:
(1) respectively preparing a functional oil phase and a functional water phase on the ground according to the proportion, and uniformly mixing to obtain a temperature response type phase change fracturing fluid;
(2) and (2) injecting the temperature response type phase change fracturing fluid obtained in the step (1) into a stratum, and along with the rise of the temperature of the stratum, when the temperature rises to the phase change temperature, rapidly raising the viscosity of the temperature response type phase change fracturing fluid to form a solid phase material, realizing the support of the fracture and finishing the phase change fracturing.
7. The use method of the temperature response type phase change fracturing fluid as claimed in claim 6, wherein in the step (2), the phase change temperature is 60-120 ℃.
8. The method for using the temperature-responsive phase-change fracturing fluid as claimed in claim 6, wherein in the step (2), the solid phase material has a porous channel structure.
9. The use method of the temperature-responsive phase-change fracturing fluid as claimed in claim 6, wherein in the step (2), the bulk density of the solid phase material is 0.41-0.51 g/cm3。
10. The use method of the temperature-responsive phase-change fracturing fluid as claimed in claim 6, wherein in the step (2), the apparent density of the solid phase material is 1.03-1.05 g/cm3。
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| CN115305078A (en) * | 2022-05-23 | 2022-11-08 | 长江大学 | Liquid-solid phase change self-supporting fracturing fluid composition and preparation method thereof |
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Inventor after: Du Guangyan Inventor after: Chen Xianhui Inventor after: Yuan Jingjing Inventor after: Peng Yuanyuan Inventor after: Zhang Yifen Inventor before: Du Guangyan Inventor before: Chen Xianhui Inventor before: Yuan Jingjing Inventor before: Peng Yuanyuan Inventor before: Zhang Yifen |