A temperature-controlled phase change fracturing proppant particle size distribution control method and corresponding apparatus

Abstract

This invention provides a method and corresponding equipment for controlling the particle size distribution of proppant in temperature-controlled phase change fracturing. The method includes the following steps: calculating the geometric dimensions of the artificial fractures formed by temperature-controlled phase change fracturing based on the geological and engineering parameters of the target oil and gas well; dividing the artificial fractures into several segments along their length based on their geometric dimensions and calculating the average fracture width of each segment; calculating the proppant particle size corresponding to each segment based on the average fracture width; and injecting proppant corresponding to the calculated particle size into each segment of the artificial fracture. This invention enables the control of chemical proppant particle size distribution using experimental and field construction data, generating chemical proppants with corresponding particle size distributions for different fracture sizes, thus improving the fracture support effect. It is also simple and easy to implement.

Description

Technical Field

[0001] This invention relates generally to the field of oil and gas development technology, and more specifically, to a method and corresponding equipment for controlling the particle size distribution of temperature-controlled phase change fracturing proppant. Background Technology

[0002] A novel hydraulic fracturing technology—temperature-controlled phase change fracturing (TCF)—is currently under development in the field of oil and gas development. In this technology, a TCF system, consisting of phase change fracturing fluid and non-phase change fracturing fluid, is first injected into the formation. This TCF system is used to create artificial fractures in the oil and gas reservoir. Subsequently, under formation temperature conditions, the phase change fracturing fluid undergoes a phase change, transforming from a liquid to a solid chemical proppant particle. This phase-change chemical proppant particle replaces conventional proppant materials such as ceramic aggregates and quartz sand to support the artificial fractures, which then serve as high-speed flow channels for underground oil and gas.

[0003] In temperature-controlled phase change fracturing (TCVF) operations, the size of the chemical proppant particles determines the propping effect. The inventors of this application recognize that, to achieve the best propping effect, proppant particles of different sizes should be used at different fracture locations. For wider artificial main fractures or fracture openings, large-diameter (generally >3mm) chemical proppant particles are most suitable; while for narrower artificial branch fractures or distal fractures, small-diameter (generally <3mm) chemical proppant particles are most suitable.

[0004] Since temperature-controlled phase change fracturing is still a novel technology, there is no established method for controlling the particle size distribution of chemical proppant. Therefore, the inventors of this application believe that there is still room for improvement in this type of solution in the prior art. Summary of the Invention

[0005] This disclosure summarizes various aspects of the embodiments and should not be construed as limiting the claims. Other implementations are contemplated based on the techniques described herein, as will be apparent to those skilled in the art upon studying the following drawings and detailed descriptions, and these implementations are intended to be included within the scope of this application.

[0006] According to one aspect of the present invention, a method for controlling the particle size distribution of temperature-controlled phase change fracturing proppant is provided, comprising the following steps: Based on the geological and engineering parameters of the target oil and gas well, calculate the geometric dimensions of the artificial fractures formed by temperature-controlled phase change fracturing; The artificial crack is divided into several segments along its length based on its geometric dimensions, and the average crack width of each segment is calculated. Calculate the proppant particle size corresponding to each artificial crack segment based on the average crack width; Inject proppant corresponding to the calculated particle size into each artificial crack segment.

[0007] According to one embodiment of the present invention, the step of calculating the geometric dimensions of the artificial fractures formed by temperature-controlled phase change fracturing based on the geological and engineering parameters of the target oil and gas well further includes: Based on the geological and engineering parameters of the target oil and gas well, calculate the fracture width data of the artificial fractures formed by temperature-controlled phase change fracturing.

[0008] According to one embodiment of the present invention, calculating the fracture width data of the artificial fractures formed by temperature-controlled phase change fracturing based on the geological and engineering parameters of the target oil and gas well further includes: The width of the artificial crack is calculated using the following formula:

[0009] in, For seam length , seam height The width of the crack at the location, in meters; This indicates the position along the seam height, in meters (m). This indicates the position along the seam length, in meters (m). Poisson's ratio is dimensionless; E is the elastic modulus, in MPa. For the height of the seam The net pressure at the point, in MPa; Construction time, in seconds; For fluid to reach the crack The time is measured in seconds (s). For the crack The seam height is measured in meters (m).

[0010] According to one embodiment of the present invention, the step of dividing the artificial crack into several segments along its length direction based on the geometric dimensions of the artificial crack and calculating the average crack width of each segment further includes: Based on the crack length data of the artificial crack, the artificial crack is divided into 3 segments along its length. The average crack width of each artificial crack segment is calculated based on the crack width data of the artificial crack.

[0011] According to one embodiment of the present invention, the step of calculating the proppant particle size corresponding to each artificial crack segment based on the average crack width further includes: Divide the average crack width corresponding to each artificial crack segment by 5 to obtain the median particle size of the proppant particles corresponding to each artificial crack segment.

[0012] According to one embodiment of the present invention, the method further includes: The correlation between different amounts of cosolvent added and the particle size of the generated proppant was obtained through testing.

[0013] According to one embodiment of the present invention, the step of injecting proppant corresponding to the calculated particle size into each artificial crack further comprises: The corresponding amount of cosolvent added is calculated based on the calculated particle size and the corresponding relationship. The proppant corresponding to the calculated particle size is generated based on the corresponding cosolvent addition amount.

[0014] According to one embodiment of the present invention, the geometric dimensions of the artificial crack include the length data, width data, and volume data of the artificial crack. The step of dividing the artificial crack into several segments along its length direction according to the geometric dimensions of the artificial crack and calculating the average crack width of each segment further includes: calculating the crack volume data of each segment of the artificial crack based on the length data, width data, volume data, and segmentation information of the artificial crack.

[0015] According to one embodiment of the present invention, injecting a proppant corresponding to the calculated particle size into each artificial crack further comprises: Based on the fracture volume data of each artificial fracture segment, proppant corresponding to the calculated particle size is injected into each artificial fracture segment.

[0016] According to another aspect of the present invention, a temperature-controlled phase change fracturing proppant particle size distribution control device is also provided, comprising: processor; and Memory, which stores processor-executable instructions. When the instruction is executed by the processor, it implements the steps of the temperature-controlled phase change fracturing proppant particle size distribution control method described in any of the foregoing embodiments.

[0017] The present application proposes a method and corresponding equipment for controlling the particle size distribution of temperature-controlled phase change fracturing proppant. This method and equipment can control the particle size distribution of chemical proppant using experimental data and field construction data. It generates chemical proppant with corresponding particle size distribution for different fracture sizes, thereby improving the fracture support effect. At the same time, it is simple and easy to implement. Attached Figure Description

[0018] To better understand the present invention, reference can be made to the embodiments shown in the following figures. Components in the figures are not necessarily drawn to scale, and related elements may be omitted, or in some cases the scale may have been enlarged to emphasize and clearly illustrate the novel features described herein. Additionally, as is known in the art, system components may be arranged differently. Furthermore, in the figures, the same reference numerals denote corresponding parts throughout several views.

[0019] Figure 1 A block diagram of a method for controlling the particle size distribution of temperature-controlled phase change fracturing proppant according to an embodiment of the present invention is shown; Figure 2 A block diagram of a method for controlling the particle size distribution of temperature-controlled phase change fracturing proppant according to another embodiment of the present invention is shown; Figure 3 The diagram showing the crack width distribution along the crack length direction calculated in Example 1 is illustrated. Figure 4 The diagram showing the crack width distribution along the crack length direction calculated in Example 2 is illustrated. Figure 5 A schematic diagram of a temperature-controlled phase change fracturing proppant particle size distribution control device according to an embodiment of the present invention is shown.

[0020] Explanation of reference numerals in the attached figures: 100, 200, Two embodiments of the temperature-controlled phase change fracturing proppant particle size distribution control method; 110-140, Steps one to four of one embodiment of the temperature-controlled phase change fracturing proppant particle size distribution control method; 210-290, Steps one to nine of another embodiment of the temperature-controlled phase change fracturing proppant particle size distribution control method; 400, Temperature-controlled phase change fracturing proppant particle size distribution control device according to an embodiment; 401, Processor; 402, Memory; 403, Input device; 404, Output device. Detailed Implementation

[0021] The following describes embodiments of the present disclosure. However, it should be understood that the disclosed embodiments are merely examples, and other embodiments may take various alternative forms. The drawings are not necessarily drawn to scale; certain functions may be exaggerated or minimized to show details of particular components. Therefore, the specific structural and functional details disclosed herein should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to use the invention in various ways. As will be understood by those skilled in the art, various features shown and described with reference to any of the drawings may be combined with features shown in one or more other drawings to produce embodiments not explicitly shown or described. The combinations of features shown provide representative embodiments for typical applications. However, various combinations and modifications of features consistent with the teachings of this disclosure may be desirable for certain particular applications or implementations.

[0022] In this application, when an element or part is referred to as "on," "joined to," "connected to," or "coupled to" another element or part, that element or part may be directly joined, connected to, or coupled to the other element or part, or there may be an element or part intervening therebetween. Conversely, when an element is referred to as "directly on," "directly joined to," "directly connected to," or "directly coupled to" another element or part, there may be no element or part intervening therebetween. Other terms used to describe the relationship between elements should be interpreted in a similar manner.

[0023] As mentioned in the background section above, the inventors recognized that there is room for improvement in the existing temperature-controlled phase change fracturing technology. Based on these problems and areas for improvement in the prior art, the inventors of this application provide a method and corresponding equipment for controlling the particle size distribution of temperature-controlled phase change fracturing proppant in one or more embodiments, which are believed to solve one or more problems in the prior art.

[0024] refer to Figure 1 In one aspect of the present invention, a method 100 for controlling the particle size distribution of temperature-controlled phase change fracturing proppant is provided, comprising the following steps: Step 110: Calculate the geometric dimensions of the artificial fractures formed by temperature-controlled phase change fracturing based on the geological and engineering parameters of the target oil and gas well. Step 120: Divide the artificial crack into several segments along its length according to the geometric dimensions of the artificial crack and calculate the average crack width of each segment. Step 130: Calculate the proppant particle size corresponding to each artificial crack segment based on the average crack width; Step 140: Inject proppant corresponding to the calculated particle size into each artificial crack segment.

[0025] Those skilled in the art will understand that the order of steps in the methods described above and below is not limited to the listed order, and can be adjusted as needed in practical applications. Some steps may also be combined or omitted without departing from the scope of protection of this invention. Furthermore, it should be noted that in this disclosure, "artificial crack" refers to cracks in the rock caused by human factors during the mining process.

[0026] Step 110 involves calculating the geometric dimensions of the artificial crack, which in some embodiments can be achieved using the following formula: Continuity equation: (a) Fluid filtration loss vl Calculation equation: (b) Fluid pressure drop equation: (c) Crack width equation: (d) Crack height equation: (e) In the above formula; This indicates the position along the seam length, in meters (m). for Time seam The flow rate at the location is expressed in m³. 3 / s; for Time seam Fluid loss at the point of application, in m³ 2 / s; for Time seam The cross-sectional area of ​​the crack is expressed in m². 2 ; Construction time, in seconds; The crack height is expressed in meters (m). for Time seam Fluid loss coefficient at the location, in m / s 0.5; For fluid to reach the crack The time is measured in seconds (s). for In the cracks of time The pressure at the point is expressed in MPa. The viscosity of the fracturing fluid is expressed in mPa·s. For the crack The seam height at the location is in meters (m). for In the cracks of time The width of the half-crack, in meters; For seam length , seam height The width of the crack at the location, in meters; This indicates the position along the seam height, in meters (m). Poisson's ratio is dimensionless; E is the elastic modulus, in MPa. For the height of the seam The net pressure at the point, in MPa; The crack half-height is in meters (m); Δs is the stress difference in MPa. This is the ratio of oil layer thickness to fracture height, dimensionless. 0.5 represents the stress intensity factor, measured in MPa·m.

[0027] The parameters required in equations (a)-(e) above are taken from reservoir geological data, laboratory experimental test data, or selected based on experience. The solution method is differential iteration. For detailed solution process, see Luo Zhifeng, Zhang Nanlin, Zhao Liqiang, Xian Chao, Wang Chunlei, Pang Qin, Numerical simulation of temperature distribution in temperature-controlled phase change fractures [J / OL]. Oil and Gas Reservoir Evaluation and Development: 1-14 [2020-11-12]. The above literature is cited here and incorporated into this publication.

[0028] See below for details. Figure 2 The diagram shown is a block diagram of a temperature-controlled phase change fracturing proppant particle size distribution control method 200 according to another embodiment of the present invention. Method 200 further includes: Step 210: Test and obtain the correspondence between different amounts of cosolvent added and the particle size of the generated proppant.

[0029] This can be obtained through several experiments, such as testing at a set stirring speed (the shear rate within an artificial crack is typically 50-80 seconds). -1 The average value can be taken as 65s. -1 The particle diameter distribution of chemical proppant under different co-solvent dosages and the synthesis method of the temperature-controlled phase change fracturing fluid system can be found in the invention patent "A Phase Change Fracturing Fluid System for Phase Change Fracturing (Publication No.: CN 106190086 A)". In this patent document, the material affecting the diameter of the generated solid chemical proppant is mainly the co-solvent. Under laboratory conditions, a raw material formulation proposed in the aforementioned document can be selected, and the particle diameter distribution of chemical proppant under different co-solvent dosages at a set stirring speed can be tested. This allows for the acquisition of the correspondence between different co-solvent dosages and the particle size of the generated proppant. This correspondence can be, for example, in the form of a mapping table, and the experimentally obtained correspondence can be stored for subsequent production use.

[0030] According to an embodiment of the present invention, in method 200, the aforementioned step 110, calculating the geometric dimensions of the artificial fractures formed by temperature-controlled phase change fracturing based on the geological and engineering parameters of the target oil and gas well, further includes: Step 220: Calculate the fracture width data of the artificial fractures formed by temperature-controlled phase change fracturing based on the geological and engineering parameters of the target oil and gas well. In some further embodiments, step 220 may further include calculating the fracture width data of the artificial fractures according to the fracture width equation (d) described above.

[0031] Furthermore, the geometric dimensions of the artificial crack can include its length, width, and volume data. Figure 2 In method 200, the aforementioned step 120, which involves dividing the artificial crack into several segments along its length direction based on the geometric dimensions of the artificial crack and calculating the average crack width of each segment, may further include: Step 230: Based on the crack length data of the artificial crack, divide the artificial crack into 3 segments on an average length direction; Step 240: Calculate the average crack width of each artificial crack segment based on the crack width data of the artificial crack; Step 250: Calculate the crack volume data of each segment of the artificial crack based on the length data, width data, volume data, and segmentation of the artificial crack.

[0032] The crack length data is also included in the geometric dimensions of the artificial crack, and can be calculated using equations (a)-(e) listed above, based on the crack length position x and the corresponding width data. Furthermore, the average crack width can be obtained by averaging the crack width data corresponding to this segment of artificial crack; the crack volume data can be calculated based on the width, height, and length data.

[0033] Continue to refer to Figure 2 The aforementioned step 130, calculating the proppant particle size corresponding to each artificial crack based on the average crack width, further includes: Step 260: Divide the average crack width corresponding to each artificial crack segment by 5 to obtain the median particle size of the proppant particles corresponding to each artificial crack segment.

[0034] In this step, the calculation standard for proppant particle size can be: the median particle size of chemical proppant particles (the particle size when the cumulative distribution in the cumulative diameter distribution map is 50%) is closest to one-fifth of the average fracture width of each segment. The purpose is to achieve multi-layer laying and reduce the negative impact of chemical proppant particles embedding into the formation and breaking on the width of artificial fractures.

[0035] Furthermore, in method 200, the aforementioned step 140, which involves injecting a proppant corresponding to the calculated particle size into each artificial crack, further includes: Step 270: Calculate the corresponding cosolvent dosage based on the calculated particle size and the corresponding relationship. This can be achieved by looking up the corresponding cosolvent dosage in the corresponding relationship lookup table based on the particle size. Step 280 Generate a proppant corresponding to the calculated particle size according to the corresponding cosolvent addition amount, for example, using the formulation given in patent document CN 106190086 A; Step 290: Inject proppant corresponding to the calculated particle size into each artificial crack according to the crack volume data of each artificial crack segment.

[0036] The following describes the concept of the present invention in conjunction with two specific calculation processes. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0037] Example 1: (1) Referring to the formulation proposed in Example 1 of patent document CN 106190086 A, take 50g of toluene, and then add 5g of melamine, 5g of triallyl isocyanurate, 10g of vinyl acetate, 1g of sodium dodecylbenzenesulfonate, 0.5g of hydrogen peroxide, and 0 / 0.5 / 1 / 1.5g of polyethylene glycol (corresponding percentages of 0%, 0.69%, 1.37%, and 2%) in sequence. Place each of these four formulations in a flask and incubate for 65 seconds. -1 Stir the mixture at a constant stirring speed until homogeneous, then place it in a constant temperature oil bath and heat it to 80-90℃ for 0.5-5 hours. Stop heating and remove the flask to test the particle diameter distribution of the chemical proppant under four different cosolvent additions. The test results are shown in Table 1. The obtained result is the correspondence between different cosolvent additions and the particle size (median particle size) of the generated proppant.

[0038] Table 1. Particle size distribution and median particle size under different cosolvent dosages

[0039] (2) Based on the geological and engineering parameters of the selected target oil and gas well, calculate the geometric dimensions of the artificial fractures formed by temperature-controlled phase change fracturing, such as... Figure 3 As shown, the results indicate that the crack opening width is approximately 8 mm, and the crack tip width is 0 mm. (3) For example Figure 3 As shown, the artificial crack is divided into three equal segments along its length, and the average crack width of each segment is calculated to be 1.33 mm, 4 mm, and 6.67 mm, respectively. (4) Based on the segmentation in step (3), calculate the crack volume of each segment. In step (2), the crack height is approximately 30m and the total length is approximately 90m. Therefore, the crack volume of each segment (crack volume = segment length × segment height × average segment width) is approximately 1.2m. 3 3.6m 3 6m 3 ; (5) Based on the segmentation in step (3), and combined with the different cosolvent additions and chemical proppant particle diameter distributions measured in step (1) at different stirring speeds, select different cosolvent additions for each segment. The selection criterion is: under the selected cosolvent addition conditions, the median particle size of the chemical proppant particles (the particle size at 50% cumulative distribution in the cumulative diameter distribution diagram) is closest to one-fifth of the average crack width of each segment. The average crack width of the first segment is 1.33 mm, which meets the requirement when the cosolvent addition is 2%; the average crack width of the second segment is 4 mm, which meets the requirement when the cosolvent addition is 0.69%; the average crack width of the third segment is 6.67 mm, which meets the requirement when the cosolvent addition is 0.

[0040] (6) Based on the selection results in step (5), design the corresponding injection procedure. This injection procedure should include three temperature-controlled phase change fracturing fluid slugs with different amounts of co-solvent (corresponding to the slugs). The fracture volume from the first slug to the third slug is approximately 1.2 m³. 3 3.6m 3 6m 3 Then the first slug should be injected with 1.2m. 3 The temperature-controlled phase change fracturing fluid has a co-solvent addition rate of 2%; the second slug should be injected to a depth of 3.6 m. 3 The temperature-controlled phase change fracturing fluid has a co-solvent addition rate of 0.69%; the third slug should be injected into a 6m³ system. 3 The temperature-controlled phase change fracturing fluid has a co-solvent addition amount of 0.

[0041] Example 2: (1) This step is the same as the operation in Example 1, or you can directly use the correspondence obtained in Example 1; (2) Based on the geological and engineering parameters of another selected target oil and gas well, calculate the geometric dimensions of the artificial fractures formed by temperature-controlled phase change fracturing, such as... Figure 4 As shown, the results indicate that the crack opening width is approximately 4 mm, and the crack tip width is 0 mm. (3) For example Figure 4 As shown, the artificial crack is divided into three equal segments along its length, and the average crack width of each segment is calculated to be 0.67 mm, 2 mm, and 3.33 mm, respectively. (4) Based on the segmentation in step (3), calculate the crack volume of each segment. The calculation in step (2) also shows that the crack height is about 20m and the total length is about 51m. Therefore, the crack volume of each segment (crack volume = single segment length × single segment height × single segment average width) is about 0.23m. 3 0.68m 3 1.33m 3 ; (5) Based on the segmentation in step (3), and combined with the different cosolvent additions and chemical proppant particle diameter distributions measured in step (1) at different stirring speeds, select different cosolvent additions for each segment. The selection criterion is: under the selected cosolvent addition conditions, the median particle size of the chemical proppant particles (the particle size when the cumulative distribution in the cumulative diameter distribution diagram is 50%) is closest to one-fifth of the average crack width of each segment. The average crack width of the first segment is 0.67 mm, which meets the requirement when the cosolvent addition is 2%; the average crack width of the second segment is 2 mm, which meets the requirement when the cosolvent addition is 1.37%; the average crack width of the third segment is 3.33 mm, which meets the requirement when the cosolvent addition is 0.69%.

[0042] (6) Based on the selection results in step (5), design the corresponding injection procedure. This injection procedure should include three temperature-controlled phase change fracturing fluid slugs with different amounts of co-solvent. The fracture volume from the first to the third slug is approximately 0.23 m³. 3 0.68m 3 1.33m 3 Then the first slug should be injected with 0.23m. 3 The temperature-controlled phase change fracturing fluid has a co-solvent addition rate of 2%; the second slug should be injected at a depth of 0.68 m. 3 The temperature-controlled phase change fracturing fluid has a co-solvent addition rate of 1.37%; the third slug should be injected to a depth of 1.33 m. 3 The temperature-controlled phase change fracturing fluid has a co-solvent addition rate of 0.69%.

[0043] According to another aspect of the present invention, the present invention further provides a temperature-controlled phase change fracturing proppant particle size distribution control device 400, comprising, as follows: Figure 5 The memory 402 and processor 401 shown are provided. The memory 402 stores a computer program that, when executed by the processor 401, implements the method described in any of the above embodiments.

[0044] Figure 5 This is a schematic diagram of the hardware structure of an embodiment of the temperature-controlled phase change fracturing proppant particle size distribution control device 400 provided by the present invention. Figure 5 Taking the device 400 shown as an example, this device includes a processor 401 and a memory 402, and may also include an input device 403 and an output device 404. The processor 401, memory 402, input device 403, and output device 404 can be connected via a bus or other means. Figure 5 Taking a bus connection as an example, input device 403 can receive input digital or character information, as well as generate signal inputs related to user settings and function controls in the temperature-controlled phase change fracturing proppant particle size distribution control scheme. Output device 404 may include display devices such as a display screen.

[0045] Memory 402, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the temperature-controlled phase change fracturing proppant particle size distribution control scheme in the embodiments of this application. Memory 402 may include a program storage area and a data storage area, wherein the program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created by using the temperature-controlled phase change fracturing proppant particle size distribution control scheme, etc. In addition, memory 402 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 402 may optionally include memory remotely located relative to processor 401, and these remote memories can be connected to the local module via a network. Examples of the above-mentioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0046] The processor 401 executes various server functions and data processing by running non-volatile software programs, instructions, and modules stored in the memory 402, thereby realizing the temperature-controlled phase change fracturing proppant particle size distribution control method described in the above method embodiments.

[0047] Those skilled in the art will also understand that the various exemplary logic blocks, modules, circuits, and algorithm steps described in conjunction with the disclosure herein can be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this interchangeability between hardware and software, the functionality of the various illustrative components, blocks, modules, circuits, and steps has been generally described. Whether this functionality is implemented as software or as hardware depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art can implement the functionality described herein in various ways for each specific application, but such implementation should not be construed as departing from the scope of the embodiments disclosed herein.

[0048] It should be understood that, where there is no conflict, all the embodiments, features, and advantages described above for the temperature-controlled phase change fracturing proppant particle size distribution control method 100, 200 according to the first aspect of the invention are equally applicable to the temperature-controlled phase change fracturing proppant particle size distribution control device 400 according to the other aspect of the invention. That is, all the embodiments and variations described above can be directly transferred and incorporated herein. For the sake of brevity, they will not be repeated here.

[0049] In summary, compared with the prior art, this invention proposes a method and corresponding equipment for controlling the particle size distribution of temperature-controlled phase change fracturing proppant. This method and equipment can use experimental data and field construction data to control the particle size distribution of chemical proppant, generate chemical proppant with corresponding particle size distribution for different fracture sizes, improve the fracture support effect, and are also simple and easy to implement.

[0050] It should be understood that, provided it is technically feasible, the technical features listed above for different embodiments can be combined with each other to form other embodiments within the scope of this invention.

[0051] In this application, the use of antonymous conjunctions is intended to include the conjunction itself. The use of definite or indefinite articles is not intended to indicate cardinality. Specifically, references to “the” object or to “a” and “one” objects are intended to indicate one of a plurality of such objects. Furthermore, the conjunction “or” may be used to convey simultaneous features rather than mutually exclusive schemes. In other words, the conjunction “or” should be understood as including “and / or”. The term “including” is inclusive and has the same scope as “contains”.

[0052] The above embodiments are possible examples of implementations of the present invention and are provided only to enable those skilled in the art to clearly understand the principles of the present invention. Those skilled in the art should understand that the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of the present invention (including the claims) is limited to these examples. Under the overall concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined with each other to produce many other variations of different aspects of the embodiments of the present invention as described above. For the sake of brevity, these variations are not provided in the specific embodiments. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of the present invention should be included within the scope of protection claimed by the present invention.

Claims

1. A method for controlling the particle size distribution of temperature-controlled phase change fracturing proppant, comprising the following steps: Based on the geological and engineering parameters of the target oil and gas well, calculate the geometric dimensions of the artificial fractures formed by temperature-controlled phase change fracturing; The artificial crack is divided into several segments along its length based on its geometric dimensions, and the average crack width of each segment is calculated. Calculate the proppant particle size corresponding to each artificial crack segment based on the average crack width; It includes: dividing the average crack width corresponding to each artificial crack segment by 5 to obtain the median particle size of the proppant particles corresponding to each artificial crack segment; The relationship between different amounts of cosolvent added and the particle size of the generated proppant was obtained through testing; Injecting a proppant corresponding to the calculated particle size into each artificial crack; this includes: calculating the corresponding amount of cosolvent added based on the calculated particle size and the corresponding relationship; and generating a proppant corresponding to the calculated particle size based on the corresponding amount of cosolvent added.

2. The method for controlling the particle size distribution of temperature-controlled phase change fracturing proppant according to claim 1, wherein, The calculation of the geometric dimensions of the artificial fractures formed by temperature-controlled phase change fracturing based on the geological and engineering parameters of the target oil and gas well further includes: Based on the geological and engineering parameters of the target oil and gas well, calculate the fracture width data of the artificial fractures formed by temperature-controlled phase change fracturing.

3. The method for controlling the particle size distribution of temperature-controlled phase change fracturing proppant according to claim 2, wherein, The step of dividing the artificial crack into several segments along its length direction according to the geometric dimensions of the artificial crack and calculating the average crack width of each segment further includes: Based on the crack length data of the artificial crack, the artificial crack is divided into 3 segments along its length. The average crack width of each artificial crack segment is calculated based on the crack width data of the artificial crack.

4. The method for controlling the particle size distribution of temperature-controlled phase change fracturing proppant according to claim 1, wherein, The geometric dimensions of the artificial crack include its length, width, and volume. The step of dividing the artificial crack into several segments along its length direction according to the geometric dimensions of the artificial crack and calculating the average crack width of each segment further includes: calculating the crack volume data of each segment of the artificial crack based on the length data, width data, volume data, and segmentation information of the artificial crack.

5. The method for controlling the particle size distribution of temperature-controlled phase change fracturing proppant according to claim 4, wherein, Injecting a proppant of the calculated particle size into each artificial crack further includes: Based on the fracture volume data of each artificial fracture segment, proppant corresponding to the calculated particle size is injected into each artificial fracture segment.

6. A temperature-controlled phase change fracturing proppant particle size distribution control device, comprising: processor; and Memory, which stores processor-executable instructions. When the instruction is executed by the processor, it implements the steps of the temperature-controlled phase change fracturing proppant particle size distribution control method according to any one of claims 1 to 5.

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