CN113756777A - Complex fracture network fracturing method - Google Patents
Complex fracture network fracturing method Download PDFInfo
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- CN113756777A CN113756777A CN202110992272.4A CN202110992272A CN113756777A CN 113756777 A CN113756777 A CN 113756777A CN 202110992272 A CN202110992272 A CN 202110992272A CN 113756777 A CN113756777 A CN 113756777A
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000012530 fluid Substances 0.000 claims abstract description 123
- 238000005086 pumping Methods 0.000 claims abstract description 54
- 238000004891 communication Methods 0.000 claims abstract description 10
- 238000006073 displacement reaction Methods 0.000 claims description 44
- 239000002245 particle Substances 0.000 claims description 9
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- 230000008569 process Effects 0.000 abstract description 13
- 238000009826 distribution Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 206010017076 Fracture Diseases 0.000 description 62
- 208000010392 Bone Fractures Diseases 0.000 description 52
- 239000007788 liquid Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 208000006670 Multiple fractures Diseases 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
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- 230000001965 increasing effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
A method of complex fracture network fracturing, the method comprising the steps of: building a fracturing system communicated with the reservoir; forming a main fracture in the reservoir using the fracturing system; cyclically switching operating parameters of the fracturing system; forming a branch fracture in communication with the main fracture in the reservoir using the fracturing system. According to the complex fracture network fracturing method provided by the application, the product (Q & mu) of the discharge capacity and the viscosity in the pumping process is greatly changed by intermittently changing the working parameters of the fracturing system, and the distribution of the fluid pressure in the fracture is circularly adjusted by adopting a method for circularly and synchronously improving or reducing the discharge capacity and the viscosity, so that the pressure in the fracture is in a circulating stress state in a wider range, a complex fracture network of a main fracture and a plurality of branch fractures is formed in a reservoir, and the construction process of volume fracturing is further expanded.
Description
Technical Field
The invention belongs to the technical field of low-permeability compact oil and gas reservoir transformation, and particularly relates to a complex fracture network fracturing method.
Background
The hydraulic fracturing is the most common reservoir transformation measure for developing low-permeability compact oil and gas reservoirs, and the optimal selection of the fracturing construction process is an important guarantee for obtaining good yield increasing effect in reservoir transformation under the condition that the parameters of underground reservoirs cannot be changed.
In the conventional fracturing process, the fracturing is usually carried out by adopting a constant viscosity and constant displacement mode, and in the fracturing pumping process, the ground stress is in a unidirectional loading state, and generally only a single double wing gap can be formed. In conventional pumping situations, the formation of a complex network of hydraulic fractures in a formation requires good conditions of formation compressibility, including good brittleness, small earth stress differences, good natural fracture development, and the like. Therefore, the conventional constant displacement and constant viscosity combined fracturing mode has great limitation on the exploitation of low-permeability oil and gas reservoirs.
By adopting the step-type variable displacement fracturing method for improving the pumping capacity, the pumping capacity exceeding the stratum absorption capacity is achieved, and then complex cracks are formed in the local range close to a well bore. Because the pump injection mode is to increase the pump injection displacement in a single direction, the pump injection displacement cannot be continuously increased under the power limitation of the fracturing equipment, and the formed multi-crack range is extremely limited.
The method of circulating pump injection can enable the stratum to be in an alternating stress disturbance state, conditions are created for forming complex fractures, the circulating stress amplitude value formed by fracturing fluid with single viscosity inside the fractures is usually extremely limited, and therefore most of formed multiple fractures are limited to be close to a well bore.
During the fracturing process, the pressure distribution in the well bore and the inside of the fracture is only related to the product Q & mu of the discharge capacity Q and the viscosity mu of the fracturing fluid, and when the product Q & mu is lower, the well bore pressure is lower during pumping, and the pressure drop gradient of the fluid along the fracture is also lower; conversely, when the product Q · μ is higher, the wellbore pressure at pumping is higher and the fluid pressure drop gradient along the fracture is also higher.
Disclosure of Invention
To overcome or at least partially address the above problems, the present invention provides a complex fracture network fracturing method.
In order to solve the technical problem, the invention provides a complex fracture network fracturing method, which comprises the following steps:
building a fracturing system communicated with the reservoir;
forming a main fracture in the reservoir using the fracturing system;
cyclically switching operating parameters of the fracturing system;
forming a branch fracture in communication with the main fracture in the reservoir using the fracturing system.
Preferably, said setting up a fracturing system in communication with the reservoir comprises the steps of:
preparing fracturing equipment and a fracturing fluid tank group;
separately loading at least a high-viscosity fracturing fluid, a low-viscosity fracturing fluid, a pad fluid and a spacer fluid in the fracturing fluid tank group;
communicating the fracturing equipment with the fracturing fluid tank set;
communicating the fracturing apparatus with the reservoir through a wellbore.
Preferably, said using said fracturing system to form a main fracture in said reservoir comprises the steps of:
pumping a pad in the fracturing system into the reservoir;
pumping a spacer fluid in the fracturing system into the reservoir;
pumping a high viscosity fracturing fluid in the fracturing system into the reservoir;
switching the high viscosity fracturing fluid to a medium displacement;
and fracturing a main fracture with preset length and width in the reservoir by using the high-viscosity fracturing fluid with medium displacement.
Preferably, the pumping of the high viscosity fracturing fluid in the fracturing system into the reservoir comprises the steps of:
adding a proppant slug with a preset large particle size into the high-viscosity fracturing fluid;
pumping a high viscosity fracturing fluid containing the proppant slug into the reservoir.
Preferably, said cyclically switching operating parameters of said fracturing system comprises the steps of:
switching the fracturing system to a low pressure state operating parameter;
switching the fracturing system to a high pressure state operating parameter;
cyclically switching the fracturing system between the low pressure state operating parameter and the high pressure state operating parameter.
Preferably, said switching said fracturing system to a low pressure state operating parameter comprises the steps of:
opening a low viscosity fracturing fluid in the fracturing system;
closing the high viscosity fracturing fluid in the fracturing system;
switching the fracturing system to a low-displacement pumping state.
Preferably, said switching said fracturing system to a high pressure state operating parameter comprises the steps of:
opening a high viscosity fracturing fluid in the fracturing system;
shutting down the low viscosity fracturing fluid in the fracturing system;
switching the fracturing system to a high-displacement pumping state.
Preferably, the forming of a branch fracture in the reservoir in communication with the main fracture using the fracturing system comprises the steps of:
acquiring working parameters of a low pressure state and a high pressure state of the fracturing system;
switching the fracturing system to the low pressure state operating parameters;
low-displacement pumping of a low viscosity fracturing fluid in the fracturing system into the reservoir;
switching the fracturing system to the high pressure state operating parameters;
pumping a high-viscosity fracturing fluid in the fracturing system into the reservoir at a high displacement;
cyclically switching the fracturing system between the low pressure state operating parameter and the high pressure state operating parameter.
Preferably, the low-displacement pumping of the low-viscosity fracturing fluid in the fracturing system into the reservoir comprises the steps of:
adding a proppant slug of a predetermined fine particle size to the low viscosity fracturing fluid;
low-displacement pumping of a low viscosity fracturing fluid containing the proppant slug into the reservoir.
Preferably, the high-displacement pumping of the high-viscosity fracturing fluid in the fracturing system into the reservoir comprises the following steps:
adding a proppant slug with a preset large particle size into the high-viscosity fracturing fluid;
high volume pumping of a high viscosity fracturing fluid containing the proppant slug into the reservoir.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: according to the complex fracture network fracturing method provided by the application, the product (Q & mu) of the discharge capacity and the viscosity in the pumping process is greatly changed by intermittently changing the working parameters of the fracturing system, and the distribution of the fluid pressure in the fracture is circularly adjusted by adopting a method for circularly and synchronously improving or reducing the discharge capacity and the viscosity, so that the pressure in the fracture is in a circulating stress state in a wider range, a complex fracture network of a main fracture and a plurality of branch fractures is formed in a reservoir, and the construction process of volume fracturing is further expanded.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a complex fracture network fracturing method provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of the working state of a complex fracture network fracturing method provided by an embodiment of the invention;
fig. 3 is a schematic diagram of distribution of internal fracture pressure Pf along a fracture path Lf and a schematic diagram of changes in cyclic stresses in fractures in a complex fracture network fracturing method provided by an embodiment of the present invention;
the reference numbers illustrate: 1-a fracturing apparatus; 2-an injection line; 3-a wellhead device; 4-a wellbore; 5-reservoir bed; 6-main stem cracking; 7-a branched fracture; 8-blowout pipeline; 9-blow spray pool; 11-fracturing fluid tank group.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In an embodiment of the present application, as shown in fig. 1, the present invention provides a complex fracture network fracturing method, which is characterized by comprising the steps of:
s1: building a fracturing system communicated with the reservoir;
in an embodiment of the present application, the constructing of the fracturing system in communication with the reservoir comprises the steps of:
preparing fracturing equipment and a fracturing fluid tank group;
separately loading at least a high-viscosity fracturing fluid, a low-viscosity fracturing fluid, a pad fluid and a spacer fluid in the fracturing fluid tank group;
communicating the fracturing equipment with the fracturing fluid tank set;
communicating the fracturing apparatus with the reservoir through a wellbore.
As shown in fig. 2, in the embodiment of the present application, the fracturing system mainly includes a fracturing equipment 1 and a fracturing fluid tank set 11, and the fracturing equipment 1 further includes: the high-pressure pipe manifold, a plurality of fracturing trucks, sand trucks and sand mixers, and the fracturing fluid tank set 11 further comprises a plurality of fluid tanks. Required liquids such as high-viscosity fracturing fluid, low-viscosity fracturing fluid, pad fluid and spacer fluid are loaded in a plurality of fluid tanks of the fracturing fluid tank group 11 in a separated mode, then the fracturing equipment 1 is communicated with the fracturing fluid tank group 11, the fracturing equipment 1 is connected with a wellhead device 3 through an injection pipeline 2, the wellhead device 3 is connected with a first end of a shaft 4, and a second end of the shaft 4 extends into a reservoir 5, so that the fracturing equipment 1 is communicated with the reservoir 5.
S2: forming a main fracture in the reservoir using the fracturing system;
in an embodiment of the present application, said using said fracturing system to form a main fracture in said reservoir comprises the steps of:
pumping a pad in the fracturing system into the reservoir;
pumping a spacer fluid in the fracturing system into the reservoir;
pumping a high viscosity fracturing fluid in the fracturing system into the reservoir;
switching the high viscosity fracturing fluid to a medium displacement;
and fracturing a main fracture with preset length and width in the reservoir by using the high-viscosity fracturing fluid with medium displacement.
In the embodiment of the application, when the fracturing system is used for forming a main fracture in the reservoir, the pad fluid and the spacer fluid in the fracturing system are sequentially pumped into the reservoir 5, and then the high-viscosity fracturing fluid is pumped, wherein the high-viscosity fracturing fluid has medium displacement, and can be fractured in the reservoir 5 to form a main fracture 6 with a certain fracture length and fracture width.
In an embodiment of the present application, the pumping the high viscosity fracturing fluid in the fracturing system into the reservoir comprises the steps of:
adding a proppant slug with a preset large particle size into the high-viscosity fracturing fluid;
pumping a high viscosity fracturing fluid containing the proppant slug into the reservoir.
In the embodiment, when the high viscosity fracturing fluid in the fracturing system is pumped into the reservoir, large particle proppant of a preset size may be poured into the high viscosity fracturing fluid, and the high viscosity fracturing fluid containing proppant slug is pumped into the reservoir 5. The size of the large particle proppant can be selected as desired and can be used to prop and maintain the formed trunk fracture 6 at a preset width.
S3: cyclically switching operating parameters of the fracturing system;
in an embodiment of the present application, the cyclically switching the operating parameters of the fracturing system includes the steps of:
switching the fracturing system to a low pressure state operating parameter;
switching the fracturing system to a high pressure state operating parameter;
cyclically switching the fracturing system between the low pressure state operating parameter and the high pressure state operating parameter.
In the embodiment of the present application, the working parameters of the fracturing system include a low-pressure state working parameter and a high-pressure state working parameter, the low-pressure state working parameter can enable the internal pressure of the wellbore 4 and the internal pressure of the fracture to be in a low-pressure state, and the high-pressure state working parameter can enable the internal pressure of the wellbore 4 and the internal pressure of the fracture to be in a high-pressure state. When the fracturing system is cycled between the low pressure state operating parameter and the high pressure state operating parameter, the wellbore 4 and fracture internal pressure are correspondingly switched between the low pressure state and the high pressure state, thereby enabling multiple fractures to be formed in the reservoir 5.
In an embodiment of the present application, the switching the fracturing system to a low pressure state operating parameter includes the steps of:
opening a low viscosity fracturing fluid in the fracturing system;
closing the high viscosity fracturing fluid in the fracturing system;
switching the fracturing system to a low-displacement pumping state.
In the embodiment of the application, when the fracturing system is switched to the low-pressure state working parameter, the liquid tank valve containing the low-viscosity fracturing fluid in the fracturing system is opened, the liquid tank valve containing the high-viscosity fracturing fluid in the fracturing system is closed, and the fracturing system is adjusted to low-displacement pumping, at this time, the low-viscosity fracturing fluid in the fracturing system can be pumped into the reservoir 5 at low displacement and gradually acts on the main fracture 6.
In an embodiment of the present application, the switching the fracturing system to the high pressure state operating parameter includes the steps of:
opening a high viscosity fracturing fluid in the fracturing system;
shutting down the low viscosity fracturing fluid in the fracturing system;
switching the fracturing system to a high-displacement pumping state.
In the embodiment of the application, when the fracturing system is switched to a high-pressure state working parameter, a liquid tank valve filled with high-viscosity fracturing fluid in the fracturing system is opened, a liquid tank valve filled with low-viscosity fracturing fluid in the fracturing system is closed, and the fracturing system is adjusted to high-displacement pumping, at the moment, the high-viscosity fracturing fluid in the fracturing system can be pumped into the reservoir 5 by the high-displacement pumping, and acts on the reservoir to form the main fracture 6.
S4: forming a branch fracture in communication with the main fracture in the reservoir using the fracturing system.
In an embodiment of the present application, the using the fracturing system to form a branch fracture in communication with the main fracture in the reservoir comprises the steps of:
acquiring working parameters of a low pressure state and a high pressure state of the fracturing system;
switching the fracturing system to the low pressure state operating parameters:
low-displacement pumping of a low viscosity fracturing fluid in the fracturing system into the reservoir 5;
switching the fracturing system to the high pressure state operating parameters;
pumping high-volume high-viscosity fracturing fluid in the fracturing system into the reservoir 5;
cyclically switching the fracturing system between the low pressure state operating parameter and the high pressure state operating parameter.
In the embodiment of the application, at the first moment, a liquid tank valve filled with low-viscosity fracturing fluid in the fracturing system is opened, a liquid tank valve filled with high-viscosity fracturing fluid in the fracturing system is closed, and the fracturing system is adjusted to low-displacement pumping, at this moment, the low-viscosity fracturing fluid in the fracturing system can be pumped into the reservoir 5 by the low-displacement pumping and gradually acts on the main crack 6; and then at the second moment, opening a liquid tank valve filled with high-viscosity fracturing fluid in the fracturing system, closing a liquid tank valve filled with low-viscosity fracturing fluid in the fracturing system, and adjusting the fracturing system to high-displacement pump injection, wherein the high-viscosity fracturing fluid in the fracturing system can be injected into the reservoir 5 by the high-displacement pump and gradually acts on the main crack 6. And then at a subsequent time, successively cycling the operations at the first and second times, the reservoir 5 and the main fracture 6 are subjected to a plurality of times of low and high pressures, so that the reservoir 5 forms a branch fracture 7 around the main fracture 6.
In the embodiment of the present application, the specific values of "high displacement" and "low displacement" may be selected as needed, and it is only necessary to ensure that the specific value of "high displacement" is significantly greater than "low displacement".
In an embodiment of the present application, the low-displacement pumping of the low-viscosity fracturing fluid in the fracturing system into the reservoir comprises the steps of:
adding a proppant slug of a predetermined fine particle size to the low viscosity fracturing fluid;
low-displacement pumping of a low viscosity fracturing fluid containing the proppant slug into the reservoir.
In the embodiment of the present application, in order to form the branched fractures 7 with different widths, a proppant slug with a preset fine particle size may be added to the low viscosity fracturing fluid, and when the low viscosity fracturing fluid is pumped into the reservoir 5, the proppant slug may also be pumped into the reservoir 5 along with the low viscosity fracturing fluid, and is used to support and maintain the formed branched fractures 7 in an open state.
In the embodiment of the application, the high-displacement pumping of the high-viscosity fracturing fluid in the fracturing system into the reservoir comprises the following steps:
adding a proppant slug with a preset large particle size into the high-viscosity fracturing fluid;
high volume pumping of high viscosity fracturing fluid containing the proppant slug into the reservoir 5.
In the present embodiment, in order to form the branched fractures 7 of different widths, a proppant slug of a predetermined large particle size may be added to the high viscosity fracturing fluid, and when the high viscosity fracturing fluid is pumped into the reservoir 5, the proppant slug may also be pumped into the reservoir 5 along with it, and serves to support and maintain the formed main fractures 6 at a predetermined width.
In the embodiment of the application, when the reservoir 5 contains carbonate, acid liquor can be added into the fracturing fluid during pumping according to the actual need of reservoir 5 reconstruction, so that the reservoir 5 is subjected to acid fracturing.
In the embodiment of the application, the viscosity of the fracturing fluid can be adjusted by guar gum, fiber and other viscosifiers.
In this application embodiment, after fracturing finishes, open blowout pipeline 8, open fracturing fluid blowout to the blowout pond 9 in, when the pressure of pit shaft 4 reduces to a certain extent, can open the well production.
According to the complex fracture network fracturing method provided by the application, the product (Q & mu) of the discharge capacity and the viscosity in the pumping process is greatly changed by intermittently changing the working parameters of the fracturing system, and the distribution of the fluid pressure in the fracture is circularly adjusted by adopting a method for circularly and synchronously improving or reducing the discharge capacity and the viscosity, so that the pressure in the fracture is in a circulating stress state in a wider range, a complex fracture network of a main fracture and a plurality of branch fractures is formed in a reservoir, and the construction process of volume fracturing is further expanded.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A complex fracture network fracturing method, the method comprising the steps of:
building a fracturing system communicated with the reservoir;
forming a main fracture in the reservoir using the fracturing system;
cyclically switching operating parameters of the fracturing system;
forming a branch fracture in communication with the main fracture in the reservoir using the fracturing system.
2. The complex fracture network fracturing method of claim 1, wherein the building of a fracturing system in communication with the reservoir comprises the steps of:
preparing fracturing equipment and a fracturing fluid tank group;
separately loading at least a high-viscosity fracturing fluid, a low-viscosity fracturing fluid, a pad fluid and a spacer fluid in the fracturing fluid tank group;
communicating the fracturing equipment with the fracturing fluid tank set;
communicating the fracturing apparatus with the reservoir through a wellbore.
3. The complex fracture network fracturing method of claim 1, wherein the using the fracturing system to form a main fracture in the reservoir comprises the steps of:
pumping a pad in the fracturing system into the reservoir;
pumping a spacer fluid in the fracturing system into the reservoir;
pumping a high viscosity fracturing fluid in the fracturing system into the reservoir;
switching the high viscosity fracturing fluid to a medium displacement;
and fracturing a main fracture with preset length and width in the reservoir by using the high-viscosity fracturing fluid with medium displacement.
4. The complex fracture network fracturing method of claim 3, wherein the pumping of the high viscosity fracturing fluid in the fracturing system into the reservoir comprises the steps of:
adding a proppant slug with a preset large particle size into the high-viscosity fracturing fluid;
pumping a high viscosity fracturing fluid containing the proppant slug into the reservoir.
5. The complex fracture network fracturing method of claim 1, wherein the cyclically switching the operating parameters of the fracturing system comprises the steps of:
switching the fracturing system to a low pressure state operating parameter;
switching the fracturing system to a high pressure state operating parameter;
cyclically switching the fracturing system between the low pressure state operating parameter and the high pressure state operating parameter.
6. The complex fracture network fracturing method of claim 5, wherein the switching the fracturing system to a low pressure state operating parameter comprises the steps of:
opening a low viscosity fracturing fluid in the fracturing system;
closing the high viscosity fracturing fluid in the fracturing system;
switching the fracturing system to a low-displacement pumping state.
7. The complex fracture network fracturing method of claim 5, wherein the switching the fracturing system to a high pressure state operating parameter comprises the steps of:
opening a high viscosity fracturing fluid in the fracturing system;
shutting down the low viscosity fracturing fluid in the fracturing system;
switching the fracturing system to a high-displacement pumping state.
8. The complex fracture network fracturing method of claim 1, wherein the using the fracturing system to form a branch fracture in the reservoir in communication with the main fracture comprises the steps of:
acquiring working parameters of a low pressure state and a high pressure state of the fracturing system;
switching the fracturing system to the low pressure state operating parameters;
low-displacement pumping of a low viscosity fracturing fluid in the fracturing system into the reservoir;
switching the fracturing system to the high pressure state operating parameters;
pumping a high-viscosity fracturing fluid in the fracturing system into the reservoir at a high displacement;
cyclically switching the fracturing system between the low pressure state operating parameter and the high pressure state operating parameter.
9. The complex fracture network fracturing method of claim 8, wherein the low-displacement pumping of the low viscosity fracturing fluid in the fracturing system into the reservoir comprises the steps of:
adding a proppant slug of a predetermined fine particle size to the low viscosity fracturing fluid;
low-displacement pumping of a low viscosity fracturing fluid containing the proppant slug into the reservoir.
10. The complex fracture network fracturing method of claim 8, wherein the high-displacement pumping of the high-viscosity fracturing fluid in the fracturing system into the reservoir comprises the steps of:
adding a proppant slug with a preset large particle size into the high-viscosity fracturing fluid;
high volume pumping of a high viscosity fracturing fluid containing the proppant slug into the reservoir.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542043A (en) * | 2022-04-28 | 2022-05-27 | 太原理工大学 | Method and device for optimizing and improving rock stratum fracturing permeability based on fracturing fluid viscosity |
| CN115126462A (en) * | 2022-06-16 | 2022-09-30 | 中国石油大学(北京) | Active control method for hydraulic fracture net |
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| CN114542043A (en) * | 2022-04-28 | 2022-05-27 | 太原理工大学 | Method and device for optimizing and improving rock stratum fracturing permeability based on fracturing fluid viscosity |
| CN114542043B (en) * | 2022-04-28 | 2022-08-12 | 太原理工大学 | Method and device for optimizing and improving rock stratum fracturing permeability based on fracturing fluid viscosity |
| CN115126462A (en) * | 2022-06-16 | 2022-09-30 | 中国石油大学(北京) | Active control method for hydraulic fracture net |
| CN115126462B (en) * | 2022-06-16 | 2024-06-04 | 中国石油大学(北京) | Active control method for hydraulic fracture network |
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