CN111396014A - Thin interbed reservoir reformation method, device and equipment - Google Patents
Thin interbed reservoir reformation method, device and equipment Download PDFInfo
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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Abstract
The application provides a thin interbed reservoir transformation method, a device and equipment, wherein the method comprises the following steps: acquiring a perforation of a horizontal well in a thick sandstone layer of a target thin interbed reservoir at a target position; injecting a first fracturing fluid into a casing of the horizontal well until the tip of a first crack formed by perforation invades a shale interlayer adjacent to the thick sandstone layer; injecting a second fracturing fluid mixed with a first reactant into the casing until a predetermined amount of the first reactant enters the first fracture tip, wherein the first reactant comprises: suspending and settling agents; a second fracturing fluid mixed with a second reactant is injected into the casing until a second fracture is obtained through the shale interbedded layer. In the embodiment of the application, the obtained second fracture penetrates through a thick sand rock layer and an adjacent shale interlayer, and the full longitudinal exploitation of the thin interbed reservoir is realized. And each reservoir is not required to be fractured, so that the transformation efficiency of the thin interbed reservoir is effectively improved.
Description
Technical Field
The application relates to the technical field of geological exploration, in particular to a thin interbed reservoir transformation method, a thin interbed reservoir transformation device and thin interbed reservoir transformation equipment.
Background
With the deep exploration and development of petroleum, a large number of distributed thin interbed reservoirs gradually become important resources for increasing the yield of petroleum. Interbed refers to the repeated appearance of two rock layers, indicating repeated, repetitive changes in the depositional environment. Thin interbed reservoirs generally refer to sedimentary rock reservoirs with alternating longitudinally thick sandstone reservoirs and relatively thin shale interbed, which exhibit alternating longitudinally sand and shale formations of varying thickness.
In the prior art, a hydraulic fracturing technology is usually adopted to fracture a thin interbed reservoir, and the hydraulic fracturing technology in the prior art is to use a large-discharge fracturing fluid to suppress high pressure at the bottom of a well to generate cracks, so that a plurality of adjacent reservoirs need to be fractured respectively in the process of fracturing the thin interbed reservoir, the fracturing construction quantity is large, and the fracture width of the obtained hydraulic fractures can frequently change at different rock stratums to cause poor fracturing effect. When the thin interbed reservoir is thin and the thickness of the shale interlayer is large, the hydraulic fracture obtained by the hydraulic fracturing technology in the prior art is difficult to penetrate through the whole reservoir, so that the reservoirs are difficult to be fully communicated in the longitudinal direction. Due to the characteristics of large interlayer stress difference of the thin interbed reservoir stratum, frequent change of mechanics and physical properties of the vertical upper rock stratum and the like, the hydraulic fracturing technology in the prior art cannot efficiently obtain hydraulic fractures with good fracturing effect so as to realize the full longitudinal utilization of the thin interbed reservoir stratum.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the application provides a thin interbed reservoir transformation method, a thin interbed reservoir transformation device and thin interbed reservoir transformation equipment, and aims to solve the problem that hydraulic fractures with good fracturing effects cannot be efficiently obtained in the prior art so as to achieve sufficient vertical exploitation of a thin interbed reservoir.
The embodiment of the application provides a thin interbed reservoir transformation method, which comprises the following steps: acquiring a perforation of a horizontal well in a thick sandstone layer of a target thin interbed reservoir at a target position; injecting a first fracturing fluid into a casing of the horizontal well until the tip of a first fracture formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer; injecting a second fracturing fluid mixed with a first reactant into the casing until a preset dose of the first reactant is in the first fracture tip, wherein the first reactant comprises: suspending and settling agents; injecting a third fracturing fluid into the casing until the second fracturing fluid mixed with the suspending agent and the settling agent in the casing is completely flushed; injecting a second fracturing fluid mixed with a second reactant into the casing until a second fracture is obtained through the shale interlayer; the second reactant is used for reacting with the first reactant entering the first fracture tip in the preset dosage to obtain the second fracture.
In one embodiment, prior to obtaining perforations of horizontal wells in a thick sandstone layer of a target thin interbed reservoir at a target location, further comprising: drilling the horizontal well at the thick sandstone layer of the target thin interbed reservoir along the direction of the minimum horizontal ground stress; acquiring logging information of the horizontal well; determining the seam distribution position of each fracturing section of the horizontal well according to the logging information; perforating at the target position of the toe end fracturing section in each fracturing section according to the crack arrangement position of each fracturing section of the horizontal well; and continuously injecting the third fracturing fluid into the casing until rock debris generated by the perforation is completely flushed.
In one embodiment, before injecting the first fracturing fluid into the casing of the horizontal well, the method further comprises: the toe end fracture was closed with a packer and bridge plug.
In one embodiment, a sensor is placed at the toe end fracture zone, wherein the sensor is used to detect horizontal well bottom pressure.
In one embodiment, injecting a first fracturing fluid into the casing of the horizontal well until the tip of the first fracture formed by the perforations invades a shale interbedded adjacent to the shale layer, comprises: continuously injecting the first fracturing fluid into the casing; determining whether the rising amplitude of the bottom hole pressure of the horizontal well is greater than or equal to a first preset threshold value or not; and under the condition that the rising amplitude of the bottom hole pressure of the horizontal well is greater than or equal to the first preset threshold value, determining that the tip of a first fracture formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer, and stopping injecting the first fracturing fluid into the casing.
In one embodiment, after injecting the second fracturing fluid mixed with the first reactant into the casing, the method further comprises: determining whether the descending amplitude of the bottom hole pressure of the horizontal well is greater than or equal to a second preset threshold value or not; and determining that the second fracture penetrates through the shale interlayer under the condition that the descending amplitude of the bottom hole pressure of the horizontal well is greater than or equal to the second preset threshold value.
In one embodiment, before injecting the second fracturing fluid mixed with the first reactant into the casing, the method further comprises: acquiring a first physical mechanical property parameter of a shale interlayer adjacent to the upper end of a thick sandstone layer of the target thin interbed reservoir; acquiring a second physical and mechanical property parameter of a shale interlayer adjacent to the lower end of the thick sandstone layer of the target thin interbed reservoir; and determining the preset dosage according to the first physical mechanical property parameter and the second physical mechanical property parameter.
In one embodiment, after obtaining the second fracture through the shale interbed, the method further comprises: continuously injecting the first fracturing fluid into the casing and increasing the discharge capacity of the first fracturing fluid until two ends of the second fracture penetrate through the shale interlayer to obtain a third fracture; and continuously injecting a fourth fracturing fluid mixed with the proppant into the casing until a third preset dosage of the proppant enters the third fracture.
In one embodiment, the suspending agent and the settling agent are solid explosives having the same explosive composition and particle size smaller than the first fracture tip; wherein the suspending agent has a density less than that of the second fracturing fluid and the settling agent has a density greater than that of the second fracturing fluid.
The embodiment of the present application further provides a thin interbed reservoir transformation device, including: the acquiring module is used for acquiring the perforation of a horizontal well in a thick sandstone layer of a target thin interbed reservoir at a target position; the first injection module is used for injecting a first fracturing fluid into a casing of the horizontal well until the tip of a first fracture formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer; a second injection module for injecting a second fracturing fluid mixed with a first reactant into the casing until a preset dose of the first reactant enters the first fracture tip, wherein the first reactant comprises: suspending and settling agents; the third injection module is used for injecting third fracturing fluid into the sleeve until the second fracturing fluid mixed with the suspending agent and the settling agent in the sleeve is completely flushed; the fourth injection module is used for injecting a second fracturing fluid mixed with a second reactant into the casing until a second fracture penetrating through the shale interlayer is obtained; the second reactant is used for reacting with the first reactant entering the first fracture tip in the preset dosage to obtain the second fracture.
The embodiment of the application also provides thin interbed reservoir reforming equipment which comprises a processor and a memory for storing processor executable instructions, wherein the processor executes the instructions to realize the steps of the thin interbed reservoir reforming method.
Embodiments of the present application also provide a computer-readable storage medium having stored thereon computer instructions that, when executed, implement the steps of the thin interbed reservoir reformation method.
The embodiment of the application provides a thin interbed reservoir transformation method, which comprises the steps of injecting first fracturing fluid into a casing of a horizontal well through a perforation of the horizontal well in a thick sandstone layer of a target thin interbed reservoir at a target position until the tip of a first crack formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer. A second fracturing fluid mixed with a first reactant may be injected into the casing until a preset dose of the first reactant is into the first fracture tip, wherein the first reactant comprises: suspending agents and settling agents. Further, a third fracturing fluid can be injected into the casing until the second fracturing fluid mixed with the suspending agent and the settling agent in the casing is completely flushed. A second fracturing fluid mixed with a second reactant may be injected into the casing until a second fracture is obtained that penetrates the interbedded shale layer, the obtained second fracture penetrating through the heavy sandstone layer and the adjacent interbedded shale layer, enabling full longitudinal mobilization of the thin interbedded reservoir. The second reactant is used for reacting with the first reactant entering the first fracture tip in the preset dosage to obtain the second fracture. Therefore, cracks penetrating through the shale interlayer can be obtained without fracturing each reservoir, the workload is reduced to a great extent, and the transformation efficiency of the thin interbed reservoir is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this application, and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic illustration of steps of a thin interbed reservoir reformation method provided in accordance with an embodiment of the present application;
FIG. 2 is a schematic diagram of a direction of minimum ground stress provided in accordance with an embodiment of the present application;
FIG. 3 is a schematic illustration of a horizontal well in a thick sandstone layer of a target thin interbed reservoir provided in accordance with a specific embodiment of the present application;
FIG. 4 is a schematic illustration of a toe end fracture section provided in accordance with a specific embodiment of the present application;
FIG. 5 is a schematic illustration of perforations provided in accordance with a particular embodiment of the present application;
FIG. 6 is a schematic illustration of the setting of a fracture zone 5 provided according to a specific embodiment of the present application;
FIG. 7 is a schematic illustration of a suspending and settling agent provided in accordance with an embodiment of the present application as a second fracturing fluid enters fracture 4;
FIG. 8 is a schematic illustration of a reagent entering fracture 4 provided in accordance with a specific embodiment of the present application;
FIG. 9 is a schematic illustration of a fracture after an explosive reaction has occurred, according to an embodiment of the present application;
FIG. 10 is a schematic illustration of a shale interbedded seam-wide end face after secondary fracturing provided in accordance with an embodiment of the present application;
FIG. 11 is a schematic illustration of proppant entering a fracture 4 provided in accordance with a particular embodiment of the present application;
FIG. 12 illustrates a plurality of through shale interbeds b provided in accordance with an exemplary embodiment of the present disclosure1、b2Schematic representation of a large fracture of (a);
FIG. 13 is a schematic structural diagram of a thin interbed reservoir reconstruction device provided in accordance with an embodiment of the present application;
fig. 14 is a schematic structural diagram of a thin interbed reservoir reforming apparatus provided according to an embodiment of the present application.
Detailed Description
The principles and spirit of the present application will be described with reference to a number of exemplary embodiments. It should be understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the present application, and are not intended to limit the scope of the present application in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As will be appreciated by one skilled in the art, embodiments of the present application may be embodied as a system, apparatus, device, method or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
Although the flow described below includes operations that occur in a particular order, it should be appreciated that the processes may include more or less operations that are performed sequentially or in parallel (e.g., using parallel processors or a multi-threaded environment).
Since the prior art usually adopts hydraulic fracturing technology to fracture thin interbed reservoirs, the fracturing is that high-viscosity liquid is injected into a well with the discharge capacity greatly exceeding the absorption capacity of the stratum, high pressure is set up at the bottom of the well, and when the pressure is higher than the ground stress near the well wall and the tensile strength of stratum rocks, the stratum near the bottom of the well is fractured. The thin interbed reservoir is a sedimentary rock reservoir in which a thick sandstone reservoir and a thin shale interlayer appear alternately in the longitudinal direction, and the hydraulic fracturing technology is characterized in that a large-discharge fracturing fluid is used for generating cracks under high pressure at the bottom of a well, so that a plurality of adjacent thick sandstone reservoirs and the adjacent mud shale interlayers are required to be fractured in the process of fracturing the thin interbed reservoir, the fracturing construction quantity is large, and the obtained hydraulic fracture width can change frequently in different rock stratums, so that the final fracturing effect is poor.
Based on the above problems, an embodiment of the present invention provides a thin interbed reservoir transformation method, as shown in fig. 1, which may include the following steps:
s101: and acquiring the perforation of a horizontal well in the thick sandstone layer of the target thin interbed reservoir at the target position.
Because fracturing artificially fractures the formation, perforations of horizontal wells in the sandstone formations in the target thin interbed reservoir at the target location may be obtained prior to fracturing. The perforation aims to establish an oil flow channel between a shaft and a target layer for oil testing or production testing. Horizontal wells are special wells where the maximum angle of inclination is kept around 90 ° and a horizontal well section of a certain length is maintained in the zone of interest.
The target position may be a position in a desired fracturing segment where the reservoir quality and the engineering quality are better, and may also be referred to as a sweet spot position. In some embodiments, free oil quantity, young modulus, permeability, physical property, oil content, brittleness, ground stress and other parameters of a target thin interbed reservoir can be measured by combining logging technologies such as electrical logging and acoustic logging on the basis of conventional logging, an evaluation model is established according to the parameters, and the reservoir quality and the engineering quality of each horizontal section in the horizontal well can be evaluated through the model. Of course, the reservoir quality and the engineering quality of each horizontal segment in the horizontal well are analyzed and determined in other manners, which is not limited in the present application. The position with better reservoir quality and engineering quality is called a dessert, and the positions of the dessert can be preferentially perforated and perforated.
Because the thin interbed reservoir is a sedimentary rock reservoir in which the thick sandstone reservoir and the thin shale interlayer alternately appear in the longitudinal direction, the reservoir has the characteristics of alternately developing sand layers and mud layers and different thicknesses in the longitudinal direction, and the reservoir property of the thick sandstone reservoir is relatively good, a horizontal well can be preferably drilled in the thick sandstone reservoir for perforation in one embodiment. Of course, in some embodiments, a horizontal well may also be drilled in a shale interbed for perforation, which may be determined according to actual conditions, and is not limited in this application.
S102: a first fracturing fluid is injected into the casing of the horizontal well until the tip of the first fracture formed by the perforations invades the shale interbeddes adjacent to the sandy rock formation.
After the perforations are obtained, performing first fracturing, specifically injecting a first fracturing fluid into the casing of the horizontal well until the tip of a first fracture formed by the perforations invades a shale interlayer adjacent to the thick sandstone layer, and stopping injecting the first fracturing fluid into the casing of the horizontal well.
The casing is arranged in a horizontal well during drilling, and can be used for assisting drilling, preventing collapse of a well hole, guiding flow and the like. The first fracturing fluid may be a pad fluid that functions to fracture the formation and create a fracture of a certain geometry. The commonly used fracturing fluids are 5 basic types of water-based fracturing fluids, oil-based fracturing fluids, emulsion fracturing fluids, foam fracturing fluids and acid-based fracturing fluids.
The thin interbed reservoir is a sedimentary rock reservoir in which a thick sandstone reservoir and a thin shale interlayer alternately appear in the longitudinal direction, so that the upper end and the lower end of the thick sandstone reservoir are the shale interlayers, and the first fracturing fluid can be stopped from being injected into the casing of the horizontal well only when the upper tip and the lower tip of the first fracture invade the shale interlayer adjacent to the thick sandstone.
In some embodiments, it may be determined whether the tip of the first fracture invades a shale interbedded layer adjacent to the sandstone layer based on the bottom hole pressure of the horizontal well, and when the bottom hole pressure of the horizontal well has a significant rise, it may be considered that the tip of the first fracture invades the shale interbedded layer adjacent to the sandstone layer due to the formation tensile strength of the shale interbedded layer.
In some embodiments, a fracturing truck may be utilized to inject fracturing fluid into the casing, and different fracturing fluids may be injected using different fracturing trucks. The fracturing truck is the main equipment for fracturing, and is used for injecting high-pressure and large-discharge fracturing fluid into a well, fracturing stratum and carrying proppant into fractures. The fracturing truck mainly comprises four parts, namely a carrying part, a power part, a transmission part, a pump body and the like. The technical performance requirement of site operation on the fracturing truck is very high, and the fracturing truck has the characteristics of high pressure, large displacement, corrosion resistance, strong abrasion resistance and the like.
S103: injecting a second fracturing fluid mixed with a first reactant into the casing until the first fracture tip enters a preset dosage of the first reactant, wherein the first reactant comprises: suspending agents and settling agents.
After the first fracture is obtained, the second fracturing fluid mixed with the first reactant may be injected into the casing until the tip of the first fracture enters the preset amount of the first reactant, at which time the injection of the second fracturing fluid mixed with the first reactant into the casing is stopped. Wherein the first reactant comprises: suspending agents and settling agents. It will be appreciated that the suspending agent may float upwards as the second fracturing fluid flows, and the settling agent may sink downwards as the second fracturing fluid, i.e. eventually the upper tip of the first fracture will have a first predetermined amount of suspending agent therein and the lower tip of the first fracture will have a second predetermined amount of settling agent therein, the sum of the first predetermined amount and the second predetermined amount being equal to the predetermined amount.
The second fracturing fluid can be a sand carrying fluid, and can play a role in bringing a suspending agent and a settling agent into the first fracture.
The preset dosage can be a numerical value of 1kg, 900g and the like, and can be determined according to actual conditions, and the application does not limit the preset dosage. In some embodiments, a first physical-mechanical property parameter of a shale interbed adjacent to an upper end of a shale layer of a thin interbed reservoir of interest may be obtained, and a dosage of a suspending agent may be determined based on the first physical-mechanical property parameter. Further, a second physical-mechanical property parameter of the shale interlayer adjacent to the lower end of the thick sandstone layer of the target thin interbed reservoir can be obtained, and the dosage of the settling agent is determined according to the second physical-mechanical property parameter. Finally, the preset dosage can be determined according to the dosage of the suspending agent and the dosage of the settling agent.
The suspending agent and the settling agent are solid explosives which have the same explosive composition and have smaller particle size than the tip of the first fracture, and are insoluble in the second fracturing fluid and do not react with the second fracturing fluid. The density of the suspending agent is less than that of the second fracturing fluid, and the density of the settling agent is greater than that of the second fracturing fluid.
S104: and injecting a third fracturing fluid into the casing until the second fracturing fluid mixed with the suspending agent and the settling agent in the casing is completely flushed.
Because the second fracturing fluid mixed with the first reactant exists in the casing, in order to avoid reaction in the casing during subsequent explosion, a third fracturing fluid can be injected into the casing until the second fracturing fluid mixed with the suspending agent and the settling agent in the casing is completely flushed. It will be appreciated that the above operation will only flush away the second fracturing fluid mixed with suspending and settling agents in the casing, and not the suspending and settling agents in the first fracture tip.
The third fracturing fluid can be a pre-pad fluid and can be used for cleaning a sleeve, and the third fracturing fluid cannot react with the suspending agent and the settling agent.
S105: injecting a second fracturing fluid mixed with a second reactant into the casing until a second fracture penetrating through the shale interlayer is obtained; the second reactant is used for reacting with the first reactant with the preset dosage entering the tip of the first crack to obtain a second crack.
In order to allow the first fracture to penetrate through the shale interbed, a second fracturing fluid mixed with a second reactant may be injected into the casing until the first fracture penetrates through the shale interbed to obtain a second fracture. The second reactant can be used for carrying out an explosion reaction with a preset dose of the first reactant entering the tip of the first fracture, so that the second fracture is obtained.
The second reactant is a liquid with certain viscosity and contains explosive reaction components, and the suspending agent and the settling agent can have explosive reaction with the suspending agent and the settling agent after a period of time after encountering the reactants. The amount of the reagent depends on the amount of the suspending agent and the settling agent, and the reagent can be continuously added into the fracture through the second fracturing fluid until the blasting is finished.
In some embodiments, it may be determined from the horizontal well bottom pressure whether the tip of the first fracture passes through a shale interbed, and the fracture resulting from the explosion may be considered to have passed through a shale interbed adjacent to the heavy sandstone layer by the sensor in the event that a significant drop in the horizontal well bottom pressure is determined due to the lower formation tensile strength of the sandstone layer. The fractures obtained from the explosion are radial dumbbells because the formation tensile strength of the shale interbeddes is greater than that of the sandstone formations.
In one embodiment, before acquiring perforations of horizontal wells in the thick sandstone layer of the target thin interbed reservoir at the target position, a horizontal well can be drilled at the thick sandstone layer of the target thin interbed reservoir along the direction of the minimum horizontal ground stress, and well logging information of the horizontal well can be acquired. Furthermore, the horizontal well can be divided into a plurality of fracturing sections, and the crack arrangement position of each fracturing section of the horizontal well is determined according to the well logging information. According to the crack arrangement position of each fracturing section of the horizontal well, firstly, perforation is carried out at the target position of the toe end fracturing section in each fracturing section, wherein the crack arrangement position of the toe end fracturing section is the target position.
Since the perforations will produce rock debris, to avoid the rock debris affecting the subsequent fracturing, the injection of the third fracturing fluid into the casing may be continued until the rock debris produced by the perforations is flushed out. It can be understood that, since the horizontal well includes a plurality of fracturing segments, in some embodiments, each fracturing segment may be perforated and fractured sequentially from the toe end to the heel end of the horizontal well, and certainly, other sequences may be selected to perform fracturing sequentially, which may be determined specifically according to actual conditions, and the present application does not limit this.
The horizontal well is drilled in the direction of the minimum horizontal ground stress, so that the horizontal well has better stability. There are various methods for determining the minimum level ground stress. The minimum horizontal ground stress refers to the minimum ground stress in the horizontal direction, and the ground stress refers to the stress existing in the earth crust before the rock is undisturbed. In some embodiments, the borehole wall failure may be detected based on a logging tool, and the horizontal principal stress direction may be determined according to the borehole wall failure mode, as shown in fig. 2, where shear failure (breakout) is the minimum horizontal ground stress direction and tensile failure (fracture) is the maximum horizontal ground stress direction. Caliper logging uses a six-armed logging tool to detect the direction of rock breakout, thereby determining the direction of minimum horizontal ground stress. In some embodiments, the minimum horizontal geostress direction may also be determined using image logging, using electronic imaging tools as well as sonic imaging tools to provide an image of the entire borehole wall condition.
In order to improve the development effect of the horizontal well, multiple fractures are generated by staged fracturing to improve the productivity of the horizontal well, so that the horizontal well can be isolated into a plurality of small sections by using some isolation tools in advance. In one embodiment, the toe end fractures may be closed with packers and bridge plugs to effect separation between the individual fractures.
In order to be able to accurately determine the reconstruction of the fracture in the toe end fracture, a sensor may be placed in the toe end fracture, wherein the sensor is used to detect the horizontal well bottom pressure. In one embodiment, when the first fracturing fluid is continuously injected into the casing, whether the rising amplitude of the bottom hole pressure of the horizontal well is greater than or equal to a first preset threshold value or not can be determined through the sensor, and in the case that the rising amplitude of the bottom hole pressure of the horizontal well is greater than or equal to the first preset threshold value, the tip of the first fracture formed by perforation is determined to invade a shale interlayer adjacent to a sandy rock stratum, and the first fracturing fluid is stopped being injected into the casing. The first preset threshold may be 1pa/s, and of course, any other possible value may also be used, which may be determined according to actual situations, and this application does not limit this.
In one embodiment, after injecting the second fracturing fluid mixed with the first reactant into the casing, it may be determined whether the magnitude of the drop in the bottom hole pressure of the horizontal well is equal to or greater than a second preset threshold value, and in the case where the magnitude of the drop in the bottom hole pressure of the horizontal well is equal to or greater than the second preset threshold value, it is determined that the second fracture passes through the shale interbedded layer. The second preset threshold may be 1.2pa/s, and of course, any other possible value may also be used, which may be determined according to actual situations, and this application does not limit this.
Since the second fracture is a small fracture that penetrates the shale interbed, i.e., the size of the fracture has not yet reached the desired requirements, in one embodiment, the injection of the first fracturing fluid into the casing and the increase in the displacement of the first fracturing fluid may be continued until both ends of the second fracture penetrate the shale interbed, resulting in a third fracture. To avoid fracture closure due to stress release, injection of a fourth fracturing fluid mixed with proppant into the casing may be continued until a third preset dose of proppant is introduced into the third fracture.
In some embodiments, the above steps S101 to S105 may be repeated to perform fracture reformation on other fracture sections in the horizontal well in sequence, and the substantial reformation on the thin interbed reservoir is to perform fixed-point blasting fracturing on the thin interbed reservoir, so as to obtain a plurality of fractures penetrating through the thick sandstone layer and the adjacent shale interlayer.
From the above description, it can be seen that the embodiments of the present application achieve the following technical effects: the method comprises the steps of injecting a first fracturing fluid into a casing of a horizontal well in a thick sandstone layer of a target thin interbed reservoir at a target position by obtaining a perforation of the horizontal well at the target position until the tip of a first fracture formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer. A second fracturing fluid mixed with a first reactant may be injected into the casing until a preset dose of the first reactant is into the first fracture tip, wherein the first reactant comprises: suspending agents and settling agents. Further, a third fracturing fluid can be injected into the casing until the second fracturing fluid mixed with the suspending agent and the settling agent in the casing is completely flushed. A second fracturing fluid mixed with a second reactant may be injected into the casing until a second fracture is obtained that penetrates the interbedded shale layer, the obtained second fracture penetrating through the heavy sandstone layer and the adjacent interbedded shale layer, enabling full longitudinal mobilization of the thin interbedded reservoir. The second reactant is used for reacting with the first reactant entering the first fracture tip in the preset dosage to obtain the second fracture. Therefore, cracks penetrating through the shale interlayer can be obtained without fracturing each reservoir, the workload is reduced to a great extent, and the transformation efficiency of the thin interbed reservoir is improved.
The above method is described below with reference to a specific example, however, it should be noted that the specific example is only for better describing the present application and is not to be construed as limiting the present application.
The embodiment of the invention provides a thin interbed reservoir transformation method, which comprises the following steps:
step 1: thick sandstone layer a in target thin interbed reservoir2A horizontal well is drilled with casing 7 in the direction of least horizontal ground stress, as shown in figure 3.
Wherein, a1、a2、a3Is a thick sandstone layer; b1、b2、b3Is a shale interlayer; c. C1、c2、c3、c4Is a fracturing truck. The fracturing truck is the main equipment for fracturing, and is used for injecting high-pressure and large-displacement fracturing fluid into the horizontal well, fracturing stratum and carrying proppant into fracture. The fracturing truck mainly comprises four parts, namely a carrying part, a power part, a transmission part, a pump body and the like, wherein the fracturing pump is a working host of the fracturing truck, the technical performance requirement of site construction on the fracturing truck is high, and the fracturing truck has the characteristics of high pressure, large displacement, corrosion resistance, strong abrasion resistance and the like.
Step 2: and performing fracturing and seam distribution on the horizontal well on the basis of conventional logging information of the horizontal well.
After the seam arrangement positions are determined, fracturing can be performed at the seam arrangement positions of all the fracturing sections from far to near in sequence, and the fracturing is performed at the toe end fracturing section firstly. As shown in fig. 4, the fracture zone 5 is the fracture zone where the toe dessert is located, also referred to as the toe fracture zone.
Determination of fracture parameters such as fracture spacing, fracture length, and number of fractures is generally determined by analyzing the parameters using numerical simulation, capacity modeling, and the like. The toe end fracture section is the fracture section farthest away from the vertical well, the heel end fracture section is the fracture section nearest to the vertical well, and the sweet spot position is the position with good reservoir quality and engineering quality. Wherein the specific distribution of the toe end and heel end is shown in figure 3.
In one embodiment, the parameters of physical property, oil-bearing property, brittleness, ground stress and the like of a target thin interbed reservoir are measured on the basis of conventional logging by combining logging technologies such as electric logging, acoustic logging and the like, and an evaluation model is established according to the parameters. Reservoir quality and engineering quality of each horizontal segment can be evaluated through the model. The position with good reservoir quality and engineering quality is called a dessert, and the dessert is sewed at the position of the dessert preferentially when the seam is sewed.
And step 3: perforations are made at the sweet spot of the fracturing segment 5, resulting in perforations 3.
As shown in fig. 5, perforations are made at the sweet spot of the fracture zone 5, resulting in perforations 3. After the perforation is finished, the fracturing truck c is used1A third fracturing fluid is injected into the casing 7 to flush out the rock debris pieces produced by the perforations. After the completion of flushing is detected, controlling a fracturing truck c1The injection of the third fracturing fluid into the casing 7 is stopped.
And 4, step 4: the first fracturing zone 5 is closed with packer 2 and bridge plug 1 and the first fracturing is initiated.
The fracturing section 5 is set as shown in fig. 6, the first fracturing section 5 is closed by a packer 2 and a bridge plug 1, and a sensor 6 is placed in the toe end fracturing section 5 (the sensor 6 is explosion-proof and can be recycled), and the bottom hole pressure of the horizontal well can be monitored by the sensor 6. By fracturing truck c2Injecting into the casing 7And (3) adding a fracturing fluid to the discharge volume of the first fracturing fluid, and forming a crack 4 vertical to the direction of the minimum horizontal ground stress after the effective stress in the perforation 3 in the fracturing section 5 reaches the tensile strength of the stratum.
At this point, the fracturing truck c is continuously passed2Injecting a first fracturing fluid into the casing 7 until the tips of the fractures 4 penetrate into the shale interlayer b1Lower end and shale interlayer b2The upper end of (a). Specifically, it can be determined by the sensor 6 whether there is a significant rise in the bottom hole pressure of the horizontal well, and in the case where it is determined that there is a significant rise, it can be considered that the fracture tip invades the shale interbedded layer b1And b2Control fracturing truck c2The injection of the fracturing fluid 2 into the casing 7 is stopped.
And 5: by fracturing truck c3Injecting a second fracturing fluid mixed with a suspending agent and a settling agent into the sleeve 7, and controlling the fracturing truck c after the tip of the crack 4 enters the suspending agent and the settling agent with preset dosage3The injection of the fracturing fluid 3 into the casing 7 is stopped.
As shown in fig. 7, the suspending agent and the settling agent enter the fracture 4 along with the second fracturing fluid, and finally the suspending agent enters the upper tip of the fracture 4 and the settling agent enters the lower tip of the fracture 4. Taking the settling agent as an example, as shown in fig. 7 a, the first predetermined amount of settling agent is introduced into the lower tip of the fracture 4. And a second predetermined dose of suspending agent is introduced into the upper tip of the slit 4, wherein the sum of the first predetermined dose and the second predetermined dose is the predetermined dose.
The suspending agent and the settling agent are solid explosives with the same explosive composition and with the particle size smaller than the tip of the crack 4, and are insoluble in the second fracturing fluid and do not react with the second fracturing fluid. The density of the suspending agent is different from that of the settling agent, the density of the suspending agent is slightly less than that of the second fracturing fluid (the density of the suspending agent is slightly higher when the second fracturing fluid flows horizontally), and the density of the settling agent is slightly higher than that of the second fracturing fluid (the density of the settling agent is slightly lower when the second fracturing fluid flows horizontally).
The amount of suspending agent depends on the shale interlayer b1Strength and thickness, the dosage of the settling agent depends on the shale interlayer b2Will letThickness and other physical and mechanical properties.
Step 6: by fracturing truck c1Injecting a third fracturing fluid into the sleeve 7, flushing the suspending agent and the settling agent in the sleeve 7, and controlling a fracturing truck c after the suspending agent and the settling agent in the sleeve 7 are flushed1The injection of the third fracturing fluid into the casing 7 is stopped.
It is noted that the third fracturing fluid will only flush out the suspending and settling agents in the casing 7, but not the suspending and settling agents in the tip of the fracture 4.
And 7: by fracturing truck c3Injecting a second fracturing fluid mixed with a second reactant into the casing 7, and controlling the fracturing truck c after the tip of the fracture 4 enters a predetermined amount of the reactant3The injection of the fracturing fluid 3 into the casing 7 is stopped.
As shown in fig. 8, by fracturing truck c3The injection of the second fracturing fluid mixed with the reagent into the casing 7 is continued until the tip of the fracture 4 enters the predetermined amount of reagent. As shown in fig. 8 at a, the reactant will follow the second fracture 3 into the fracture zone 5 and eventually into the tip of the fracture.
The second reactant is a liquid with certain viscosity and contains explosive reaction components, and the suspending agent and the settling agent can have explosive reaction with the suspending agent and the settling agent after a period of time after encountering the reactants. The amount of the reagent depends on the amount of the suspending agent and the settling agent, and the reagent can be continuously added by using the second fracturing fluid until the blasting is completed.
And 8: waiting for a period of time to allow the suspending and settling agents at the tip of the fracture 4 to fully undergo an explosive reaction with the reactants to obtain a connection a1、a2Fracture and a joint a of thick sand formation2、a3A fracture of a thick sand formation as shown in figure 9.
The time for the reaction of the suspending (or settling) agent with the reactant is greater than the time required for step 7 with a considerable time margin.
When the fracture obtained by explosion passes through the adjacent shale interlayer of the reservoir, the sensor 6 determines that the bottom hole pressure of the horizontal well is obviously reduced because the stratum tensile strength of the sandstone layer is lowerIn this case, it is considered that the fracture obtained by explosion penetrates through the thick sandstone layer a2Adjacent shale interlayers. As shown in B of fig. 9, the explosively obtained fractures are in the shape of radial dumbbells because the formation tensile strength of the shale interbeddes is greater than that of the sandstone formations.
And step 9: by fracturing truck c2Injecting a first fracturing fluid into the casing 7 and increasing the discharge capacity of the first fracturing fluid, and continuing to expand the fracture 4 along the fractures at the two ends until the fracture 4 penetrates through the shale interlayer b1、b2。
The wide end face of the shale interlayer after the secondary fracturing is shown as C in figure 10, and the crack 4 penetrates the shale interlayer b1、b2Under the condition of (1), controlling the fracturing truck c2Stopping the injection of the first fracturing fluid into the casing 7, and obtaining a through shale interlayer b1、b2Large cracks of (2).
Step 10: by fracturing truck c4A fourth fracturing fluid mixed with proppant is injected into the casing 7.
Using the fourth fracturing fluid to carry the proppant into the fracture 4, as shown in fig. 11, after enough proppant enters the fracture 4, controlling the fracturing truck c4The injection of the fourth fracturing fluid into the casing 7 is stopped. Wherein the proppant enters the fracture to act as a proppant to prop the fracture from closing due to stress release.
Step 11: transferring the bridge plug and the packer to the next fracturing section, repeating the steps 1-10, and obtaining a penetrated shale interlayer b again1、b2The large cracks are analogized in turn, and finally a plurality of through shale interlayers b can be obtained1、b2As shown in fig. 12.
Based on the same inventive concept, the embodiment of the present application further provides a thin interbed reservoir reforming device, as described in the following embodiments. Because the principle of solving the problems of the thin interbed reservoir reforming device is similar to that of the thin interbed reservoir reforming method, the implementation of the thin interbed reservoir reforming device can refer to the implementation of the thin interbed reservoir reforming method, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Fig. 13 is a block diagram of a thin interbed reservoir reforming apparatus according to an embodiment of the present disclosure, and as shown in fig. 13, the thin interbed reservoir reforming apparatus may include: the acquisition module 131, the first injection module 132, the second injection module 133, the third injection module 134, and the fourth injection module 135, and the structure thereof will be described below.
The obtaining module 131 may be used to obtain perforations of horizontal wells in the thick sandstone layer of the target thin interbed reservoir at the target location.
A first injection module 132 may be used to inject a first fracturing fluid into the casing of the horizontal well until the tips of the first fractures formed by the perforations invade a shale interbedded adjacent to the sandstone formation.
A second injection module 133 operable to inject a second fracturing fluid mixed with a first reactant into the casing until a predetermined amount of the first reactant enters the first fracture tip, wherein the first reactant comprises: suspending agents and settling agents.
And a third injection module 134, which can be used for injecting a third fracturing fluid into the casing until the second fracturing fluid mixed with the suspending agent and the sedimentation agent in the casing is completely flushed.
A fourth injection module 135 that may be used to inject a second fracturing fluid mixed with a second reactant into the casing until a second fracture is obtained through the shale interbed; the second reactant is used for reacting with the first reactant entering the first fracture tip in the preset dosage to obtain the second fracture.
The embodiment of the present application further provides an electronic device, which may specifically refer to fig. 14, which is a schematic structural diagram of an electronic device based on the thin interbed reservoir reformation method provided in the embodiment of the present application, and the electronic device may specifically include an input device 41, a processor 42, and a memory 43. Wherein the input device 41 may be specifically used to input perforations of horizontal wells in the thick sands of a target thin interbed reservoir at a target location. The processor 42 may be specifically configured to obtain perforations of horizontal wells in the thick sandstone layer of the target thin interbed reservoir at the target location; injecting a first fracturing fluid into a casing of the horizontal well until the tip of a first fracture formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer; injecting a second fracturing fluid mixed with a first reactant into the casing until a preset dose of the first reactant is entered into the first fracture tip, wherein the first reactant comprises: suspending and settling agents; injecting a third fracturing fluid into the casing until the second fracturing fluid mixed with the suspending agent and the settling agent in the casing is completely flushed; injecting a second fracturing fluid mixed with a second reactant into the casing until a second fracture is obtained through the shale interlayer; the second reactant is used for reacting with the first reactant entering the first fracture tip in the preset dosage to obtain the second fracture. The memory 43 may be specifically configured to store parameters such as a preset dose.
In this embodiment, the input device may be one of the main apparatuses for information exchange between a user and a computer system. The input device may include a keyboard, a mouse, a camera, a scanner, a light pen, a handwriting input board, a voice input device, etc.; the input device is used to input raw data and a program for processing the data into the computer. The input device can also acquire and receive data transmitted by other modules, units and devices. The processor may be implemented in any suitable way. For example, the processor may take the form of, for example, a microprocessor or processor and a computer-readable medium that stores computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, an embedded microcontroller, and so forth. The memory may in particular be a memory device used in modern information technology for storing information. The memory may include multiple levels, and in a digital system, the memory may be any memory as long as it can store binary data; in an integrated circuit, a circuit without a physical form and with a storage function is also called a memory, such as a RAM, a FIFO and the like; in the system, the storage device in physical form is also called a memory, such as a memory bank, a TF card and the like.
In this embodiment, the functions and effects specifically realized by the electronic device can be explained by comparing with other embodiments, and are not described herein again.
The embodiment of the application also provides a computer storage medium based on the thin interbed reservoir transformation method, the computer storage medium stores computer program instructions, and when the computer program instructions are executed, the computer storage medium can realize: acquiring a perforation of a horizontal well in a thick sandstone layer of a target thin interbed reservoir at a target position; injecting a first fracturing fluid into a casing of the horizontal well until the tip of a first fracture formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer; injecting a second fracturing fluid mixed with a first reactant into the casing until a preset dose of the first reactant is entered into the first fracture tip, wherein the first reactant comprises: suspending and settling agents; injecting a third fracturing fluid into the casing until the second fracturing fluid mixed with the suspending agent and the settling agent in the casing is completely flushed; injecting a second fracturing fluid mixed with a second reactant into the casing until a second fracture is obtained through the shale interlayer; the second reactant is used for reacting with the first reactant entering the first fracture tip in the preset dosage to obtain the second fracture.
In the present embodiment, the storage medium includes, but is not limited to, a Random Access Memory (RAM), a Read-Only Memory (ROM), a Cache (Cache), a Hard disk (HDD), or a Memory Card (Memory Card). The memory may be used to store computer program instructions. The network communication unit may be an interface for performing network connection communication, which is set in accordance with a standard prescribed by a communication protocol.
In this embodiment, the functions and effects specifically realized by the program instructions stored in the computer storage medium can be explained by comparing with other embodiments, and are not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the present application described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different from that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
Although the present application provides method steps as described in the above embodiments or flowcharts, additional or fewer steps may be included in the method, based on conventional or non-inventive efforts. In the case of steps where no necessary causal relationship exists logically, the order of execution of the steps is not limited to that provided by the embodiments of the present application. When the method is executed in an actual device or end product, the method can be executed sequentially or in parallel according to the embodiment or the method shown in the figure (for example, in the environment of a parallel processor or a multi-thread processing).
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the application should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the pending claims along with the full scope of equivalents to which such claims are entitled.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiment of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. A method of thin interbed reservoir reformation, comprising:
acquiring a perforation of a horizontal well in a thick sandstone layer of a target thin interbed reservoir at a target position;
injecting a first fracturing fluid into a casing of the horizontal well until the tip of a first fracture formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer;
injecting a second fracturing fluid mixed with a first reactant into the casing until a preset dose of the first reactant is in the first fracture tip, wherein the first reactant comprises: suspending and settling agents;
injecting a third fracturing fluid into the casing until the second fracturing fluid mixed with the suspending agent and the settling agent in the casing is completely flushed;
injecting a second fracturing fluid mixed with a second reactant into the casing until a second fracture is obtained through the shale interlayer; the second reactant is used for reacting with the first reactant entering the first fracture tip in the preset dosage to obtain the second fracture.
2. The method of claim 1, further comprising, prior to obtaining perforations of horizontal wells in a thick sandstone layer of a target thin interbed reservoir at a target location:
drilling the horizontal well at the thick sandstone layer of the target thin interbed reservoir along the direction of the minimum horizontal ground stress;
acquiring logging information of the horizontal well;
determining the seam distribution position of each fracturing section of the horizontal well according to the logging information;
perforating at the target position of the toe end fracturing section in each fracturing section according to the crack arrangement position of each fracturing section of the horizontal well;
and continuously injecting the third fracturing fluid into the casing until rock debris generated by the perforation is completely flushed.
3. The method of claim 2, further comprising, prior to injecting the first fracturing fluid into the casing of the horizontal well: the toe end fracture was closed with a packer and bridge plug.
4. The method of claim 2, wherein a sensor is placed at the toe end fracture, wherein the sensor is used to detect horizontal well bottom pressure.
5. The method of claim 4, wherein injecting a first fracturing fluid into the casing of the horizontal well until the tip of the first fracture formed by the perforations invades a shale interbedded adjacent to the shale layer comprises:
continuously injecting the first fracturing fluid into the casing;
determining whether the rising amplitude of the bottom hole pressure of the horizontal well is greater than or equal to a first preset threshold value or not;
and under the condition that the rising amplitude of the bottom hole pressure of the horizontal well is greater than or equal to the first preset threshold value, determining that the tip of a first fracture formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer, and stopping injecting the first fracturing fluid into the casing.
6. The method of claim 4, further comprising, after injecting the second fracturing fluid mixed with the first reactant into the casing:
determining whether the descending amplitude of the bottom hole pressure of the horizontal well is greater than or equal to a second preset threshold value or not;
and determining that the second fracture penetrates through the shale interlayer under the condition that the descending amplitude of the bottom hole pressure of the horizontal well is greater than or equal to the second preset threshold value.
7. The method of claim 1, further comprising, prior to injecting the second fracturing fluid mixed with the first reactant into the casing:
acquiring a first physical mechanical property parameter of a shale interlayer adjacent to the upper end of a thick sandstone layer of the target thin interbed reservoir;
acquiring a second physical and mechanical property parameter of a shale interlayer adjacent to the lower end of the thick sandstone layer of the target thin interbed reservoir;
and determining the preset dosage according to the first physical mechanical property parameter and the second physical mechanical property parameter.
8. The method of claim 1, further comprising, after obtaining a second fracture through the shale interbed:
continuously injecting the first fracturing fluid into the casing and increasing the discharge capacity of the first fracturing fluid until two ends of the second fracture penetrate through the shale interlayer to obtain a third fracture;
and continuously injecting a fourth fracturing fluid mixed with the proppant into the casing until a third preset dosage of the proppant enters the third fracture.
9. The method of claim 1, wherein the suspending agent and the settling agent are solid explosives having the same explosive composition and a particle size smaller than the first fracture tip; wherein the suspending agent has a density less than that of the second fracturing fluid and the settling agent has a density greater than that of the second fracturing fluid.
10. A thin interbed reservoir alteration apparatus, comprising:
the acquiring module is used for acquiring the perforation of a horizontal well in a thick sandstone layer of a target thin interbed reservoir at a target position;
the first injection module is used for injecting a first fracturing fluid into a casing of the horizontal well until the tip of a first fracture formed by the perforation invades a shale interlayer adjacent to the thick sandstone layer;
a second injection module for injecting a second fracturing fluid mixed with a first reactant into the casing until a preset dose of the first reactant enters the first fracture tip, wherein the first reactant comprises: suspending and settling agents;
the third injection module is used for injecting third fracturing fluid into the sleeve until the second fracturing fluid mixed with the suspending agent and the settling agent in the sleeve is completely flushed;
the fourth injection module is used for injecting a second fracturing fluid mixed with a second reactant into the casing until a second fracture penetrating through the shale interlayer is obtained; the second reactant is used for reacting with the first reactant entering the first fracture tip in the preset dosage to obtain the second fracture.
11. A thin interbed reservoir reconstruction device comprising a processor and a memory for storing processor-executable instructions which, when executed by the processor, implement the steps of the method of any one of claims 1 to 9.
12. A computer-readable storage medium having stored thereon computer instructions which, when executed, implement the steps of the method of any one of claims 1 to 9.
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