Post-compression analysis method, electronic device and storage medium

Abstract

The present invention proposes a post-fracturing analysis method, electronic device and storage medium. The post-fracturing analysis includes: taking a single section of a fractured horizontal well with the same fracturing string and the same fracturing fluid system as the analysis target, calculating the perforation friction P along the way of each well and each fracturing section well‑perf and the perforation friction coefficient α; using the perforation friction value P of each well and each fracturing stage well‑perf , calculate the friction coefficient gradient λ along the perforation of each fracturing stage; based on the friction coefficient gradient λ along the perforation of each fracturing stage, obtain the minimum value by comparison, so as to determine the friction coefficient gradient λ along the perforation min ; Using the friction coefficient gradient λ along the way min , calculate the friction resistance P along each well and each fracturing stage well The present invention is aimed at a well that has been fractured using the same fracturing string and the same fracturing fluid system, and uses the data of the pump-off pressure of each section of the main fracturing to quantitatively evaluate the friction along the string under the conditions of using the fracturing string and the fracturing fluid system.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas field development, and in particular relates to a post-fracturing analysis method, electronic equipment and computer-readable storage medium for evaluating the friction along a horizontal well fracturing string. Background Art

[0002] During hydraulic fracturing, the fracturing fluid enters the cracks from the pump outlet through the surface pipeline, wellbore string and perforation holes. In each flow channel, pressure loss will occur due to friction. Calculating these pressure losses and analyzing their influencing factors are extremely critical for evaluating the effect of fracturing construction. The accuracy of the friction value along the fracturing string directly affects the fracturing process design plan, is an important data for determining the bottom hole pressure, and is also a major factor in predicting construction risks and directly affecting the success of fracturing construction.

[0003] In actual fracturing design, there are several methods for obtaining the friction along the fracturing string of horizontal wells:

[0004] The first method is to use empirical estimation to calculate the friction loss of interest. This method is often used in field fracturing optimization design, but it often cannot accurately predict the actual friction. In particular, there are many types of fracturing fluids, and the fracturing fluid systems used in various oil fields and blocks are different, so the empirical estimation method cannot be generalized.

[0005] The second method mainly relies on rheology and hydraulics to calculate, but it cannot be applied on site at present. The main reason is that these methods all require the input of some parameters, such as fracturing fluid rheological parameters, wellbore roughness coefficient, etc. The accuracy of the input values ​​of these parameters directly affects the size of the calculation results. However, such parameters are basically unavailable. Therefore, the calculation mainly relies on assumed parameters to predict the friction along the fracturing string.

[0006] The third method is to rely on indoor tests to measure, and then calculate and infer the data to the field. However, the biggest drawback of this method is that the experimental scale cannot be consistent with the field scale.

[0007] The fourth method is to directly monitor the bottom hole pressure by inserting a downhole pressure gauge. However, this method is expensive and has complicated procedures, and its large-scale application is subject to certain limitations.

[0008] Clarifying the friction resistance along the fracturing string is extremely important for clarifying the optimal design space for fracturing, judging the pressure limit of ground construction equipment, and predicting construction risks. Especially for horizontal well segmented and clustered fracturing, since the horizontal well section has a long span and the friction resistance along the construction string of each section has a great influence, accurate evaluation of the friction resistance along the fracturing string is the basis of horizontal well fracturing design. However, there is currently a lack of an easy-to-operate, economical and fast evaluation method at the fracturing site.

[0009] Therefore, the art needs to establish a post-fracturing analysis method for evaluating the friction resistance along the fracturing string of a horizontal well, which can evaluate the friction resistance along the string by using the pressure data of the pump stop at the previous fracturing well. Summary of the invention

[0010] The present invention provides a post-fracturing analysis method for evaluating the friction resistance of the horizontal well fracturing string. For the fractured wells in the same region, using the same fracturing string and the same fracturing fluid system, by analyzing the pump stop pressure second data of the previous fracturing wells, combined with data statistical methods, the friction resistance of the string under the conditions of using the fracturing string and the fracturing fluid system is quantitatively evaluated.

[0011] Specifically, for the wells that have been fractured in the same region, using the same fracturing string and the same fracturing fluid system, the main fracturing pump stop pressure second data analysis is used, combined with data statistics to quantitatively evaluate the friction resistance along the string under the conditions of the fracturing string and fracturing fluid system. This method can provide a theoretical basis and technical support for the real-time evaluation of the post-fracture effect at the hydraulic fracturing construction site and the optimization of subsequent fracturing construction.

[0012] According to one aspect of the present invention, a post-fracturing analysis method for evaluating the friction along the fracturing string of a horizontal well is provided, comprising:

[0013] A single section of a fractured horizontal well with the same fracturing string and the same fracturing fluid system is used as the analysis target to calculate the along-perforation friction P of each well and each fracturing section. well-perf and along-the-perforation friction coefficient α;

[0014] The friction value P along the perforation of each well and each fracturing stage is used. well-perf , calculate the along-the-perforation friction coefficient gradient λ of each well and each fracturing stage;

[0015] Determine the friction coefficient gradient λ along the path based on the friction coefficient gradient λ along the path and perforation of each well and each fracturing stage min ;

[0016] Using the friction coefficient gradient λ along the path min Calculate the friction resistance P along the way for each well and each fracturing stage well-mn .

[0017] Furthermore, the following formula is used to calculate the perforation friction P of each well and each fracturing stage: well-perf :

[0018] P well-perf =P(t p =0)-P(t p1 ) (1)

[0019] Among them, P(tp =0) is the initial pressure value corresponding to the pump stopping, t p1 is the time when the friction along the perforation disappears, P(t p1 ) is the pressure corresponding to that moment.

[0020] Furthermore, the following formula is used to calculate the along-perforation friction coefficient α of each well and each fracturing stage:

[0021] α=P well-perf / Q 2 (2)

[0022] Among them, Q is the instantaneous displacement before the pump is stopped during fracturing.

[0023] Furthermore, the following formula is used to calculate the along-perforation friction coefficient gradient λ of each well and each fracturing stage: mn :

[0024] λ mn =α mn / H mn (3)

[0025] Where m is the horizontal well number, 1≤m≤k, k is the total number of horizontal wells; n is the segment number, 1≤n≤j, j is the total number of fracturing segments in any horizontal well m; α mn is the friction coefficient along the perforation of the nth fracturing stage in well m; H mn It is the measured depth of the middle part of the nth fracturing section of well m, in meters.

[0026] Furthermore, by comparing the friction coefficient gradient along the perforation of each well and each fracturing section, the minimum value is obtained as the friction coefficient gradient along the perforation when the fracturing string and fracturing fluid system are used; the minimum value λ of the friction coefficient gradient along the perforation is calculated using the following formula: min :

[0027] λ min =min(λ1,…,λ n ,…λ k ) (4).

[0028] Furthermore, the friction resistance P along each well and each fracturing stage is calculated using the following formula: well-mn :

[0029] P well-mn =λ min H mn Q mn 2 (5)

[0030] Among them, P well-mn is the friction resistance along the nth fracturing stage of well m; Q mn It is the instantaneous displacement before stopping the pump in the nth fracturing stage of well m.

[0031] Further, according to the pressure P(t p ) and pump stop time t p Data, obtain the pressure difference derivative curve;

[0032] Determine the time t at which the friction along the perforation disappears on the pressure difference derivative curve p1 And record the corresponding pressure P(t p1 ).

[0033] Furthermore, on the pressure difference derivative curve, determine the time t when the first part with a slope of 1 and the subsequent “hump” peak appears. p1 , t p1 The time is the time when the friction along the perforation disappears.

[0034] According to another aspect of the present invention, there is provided an electronic device, the electronic device comprising:

[0035] A memory storing executable instructions;

[0036] A processor runs the executable instructions in the memory to implement the post-fracturing analysis method for evaluating the friction along the horizontal well fracturing string.

[0037] According to another aspect of the present invention, a computer-readable storage medium is provided, which stores a computer program, and when the computer program is executed by a processor, the post-fracturing analysis method for evaluating the friction resistance along the horizontal well fracturing string is implemented.

[0038] The present invention provides a post-fracturing analysis method for evaluating the friction resistance of a horizontal well fracturing string. For a well that has been fractured using the same fracturing string and the same fracturing fluid system, the pressure data of each section of the main fracturing pump stop are used to quantitatively evaluate the friction resistance of the string under the conditions of using the fracturing string and the fracturing fluid system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components in the exemplary embodiments of the present disclosure.

[0040] Figure 1 The present invention is a flow chart of a post-fracturing analysis method for evaluating the friction along the fracturing string of a horizontal well.

[0041] Figure 2 This is the selection of the pump stop pressure second point data analysis segment according to an embodiment of the present invention.

[0042] Figure 3 Graph showing pressure difference and pressure difference derivative according to an embodiment of the present invention.

[0043] Figure 4 It is the instantaneous displacement before the pump is stopped in each well and each fracturing stage according to the embodiment of the present invention.

[0044] Figure 5 It is the perforation friction value along the well and each fracturing stage according to the embodiment of the present invention.

[0045] Figure 6 It is the perforation friction coefficient along the well and each fracturing stage according to the embodiment of the present invention.

[0046] Figure 7 It is the perforation friction gradient coefficient along the well and each fracturing stage according to the embodiment of the present invention.

[0047] Figure 8 is the friction gradient coefficient along the tubing string of each well and each fracturing section according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0049] The present invention provides a post-fracturing analysis method for evaluating the friction resistance along the horizontal well fracturing string. The method does not require step injection test and bottom hole pressure test. Only relying on the actual pressure point data at the fracturing construction site, the friction resistance along the horizontal well fracturing process can be quantitatively evaluated.

[0050] like Figure 1 As shown, the post-fracturing analysis method for evaluating the friction resistance along the horizontal well fracturing string according to the present invention comprises:

[0051] A single section of a fractured horizontal well with the same fracturing string and the same fracturing fluid system is used as the analysis target to calculate the along-perforation friction P of each well and each fracturing section. well-perf and along-the-perforation friction coefficient α;

[0052] The friction value P along the perforation of each well and each fracturing stage is used. well-perf , calculate the along-the-perforation friction coefficient gradient λ of each well and each fracturing stage;

[0053] Based on the along-perforation friction coefficient gradient of each well and each fracturing stage, the along-perforation friction coefficient gradient λ is determined by selecting the minimum value min ;

[0054] Using the friction coefficient gradient λ along the path min Calculate the friction resistance P along the way for each well and each fracturing stage well .

[0055] Preferably, the following formula can be used to calculate the perforation friction P of each well and each fracturing stage: well-perf :

[0056] P well-perf =P(t p =0)-P(t p1 ) (1)

[0057] Among them, P(t p =0) is the initial pressure value corresponding to the pump stopping, t p1 is the time when the friction along the perforation disappears, P(t p1 ) is the pressure corresponding to that moment.

[0058] Specifically, first collect and organize the surface pumping pressure data of the main fracturing construction in each fracturing section of the target block that has been fractured, including: fracturing time, pumping displacement, surface pumping pressure (pressure recording data in seconds); clarify the fracturing fluid system and string material and model that need to be evaluated. For the target block, select the fracturing data of each section of the fractured horizontal well that uses the same fracturing string and the same fracturing fluid system.

[0059] Next, taking the single section of the horizontal well as the analysis target, the data of the pump stop time of each well and each section of the fracturing operation were selected for analysis, and the instantaneous displacement Q before the pump stop and the initial pressure value P (t p =0), taking the instantaneous pump stop time as the starting point (denoted as t p =0), according to the pressure P(t p ) and pump stop time t p The data can be used to obtain the subsequent pump shutdown time, pressure difference and pressure derivative (Bourdet derivative). The time t when the friction resistance along the perforation disappears is determined on the pressure difference derivative curve. p1 And record the corresponding pressure P(t p1 ).

[0060] Specifically, on the pressure differential derivative curve, observe the first part with a slope of 1 and the time when the subsequent "hump" peak appears (usually about one minute after the pump is stopped), and record the corresponding pressure P (t p1 ) and the appearance time t p1 , t p1 The time is the time when the friction along the perforation disappears.

[0061] Furthermore, when fracturing horizontal wells in stages and clusters, the displacement of each stage is affected by the formation and the construction method, and there are differences in displacement. In order to eliminate the displacement difference, the following formula is used to calculate the friction coefficient α along the perforation of each fracturing stage:

[0062] α=P well-perf / Q 2 (2)

[0063] Among them, Q is the instantaneous displacement before the pump stops.

[0064] The along-perforation friction coefficient α is calculated for each well and each fracturing section in the target block, and the along-perforation friction coefficient of each section of the fractured horizontal wells in the target block using the same fracturing string and the same fracturing fluid system is obtained.

[0065] Furthermore, in order to eliminate the influence of the flow distance of each fracturing stage, the friction coefficient gradient λ along the perforation of each fracturing stage is calculated. mn The depth measurement in the middle of each fracturing section is regarded as the average fracturing fluid flow distance. The friction coefficient gradient λ of the perforation along the perforation of each fracturing section is calculated by the following formula using the friction coefficient value along the perforation of each fracturing section. mn :

[0066] λ mn =α mn / H mn (3)

[0067] Where m is the horizontal well number, 1≤m≤k, k is the total number of horizontal wells; n is the segment number, 1≤n≤j, j is the total number of fracturing segments in any horizontal well m; α mn is the friction coefficient along the perforation of the nth fracturing stage in well m; H mn It is the measured depth of the middle part of the nth fracturing section of well m, in meters.

[0068] Furthermore, by comparing the friction coefficient gradient along the perforation of each well and each fracturing stage, the minimum value is obtained. The perforation friction of the fracturing stage corresponding to the minimum value can be ignored, so it can be used as the friction coefficient gradient along the fracturing string and fracturing fluid system. The minimum value of the friction coefficient gradient along the perforation is calculated using the following formula: min :

[0069] λ min =min(λ1,…,λ n ,…λ k ) (4)

[0070] Furthermore, the friction resistance P along each well and each fracturing stage is calculated using the following formula: well-mn :

[0071] P well-mn =λ min Hmn Q mn 2 (5)

[0072] Among them, P well-mn is the friction resistance along the nth fracturing stage of well m; Q mn It is the instantaneous displacement before stopping the pump in the nth fracturing stage of well m.

[0073] To facilitate understanding of the solutions and effects of the embodiments of the present invention, a specific application example is given below. Those skilled in the art should understand that the example is only for facilitating understanding of the present invention, and any specific details thereof are not intended to limit the present invention in any way.

[0074] Example 1

[0075] According to the post-fracturing analysis method for evaluating the friction along the horizontal well fracturing string of this embodiment, the following steps may be included:

[0076] (1) Collect and organize the surface pumping pressure data of the main fracturing construction of the fractured horizontal wells and each fracturing stage in the target block, including: fracturing time, pumping displacement, surface pumping pressure (pressure recording data in seconds);

[0077] (2) Identify the fracturing fluid system and tubing material and model that need to be evaluated. For the target block, select the fracturing data of each section of the horizontal well that has been fractured using the same fracturing tubing and the same fracturing fluid system;

[0078] (3) Taking a single section of a horizontal well as the analysis target, the data of the pump stop time of each section of the fracturing operation were selected for analysis. The instantaneous displacement Q before the pump was stopped for each well and each fracturing section, as well as the initial pressure value P (t p =0), see Figure 2 ;

[0079] (4) Taking the instantaneous pump stop time as the starting point (denoted as t p =0), according to the pressure P(t p ) and pump stop time t p Data, to obtain the subsequent pump shutdown time, pressure difference and pressure derivative (Bourdet derivative), see Figure 3 ;

[0080] (5) On the double logarithmic pressure derivative curve, observe the first slope of 1 and the time when the subsequent "hump" peak appears (usually about one minute after the pump is stopped), and record the corresponding pressure P (t p1 ) and the appearance time t p1 , t p1 The time is the time when the friction resistance along the perforation disappears;

[0081] (6) Calculate the perforation friction P along the course of each well and each fracturing stage well-perf

[0082] P well-perf =P(t p =0)-P(t p1 ) (1)

[0083] (7) When fracturing horizontal wells in stages and clusters, the displacement of each stage is affected by the formation and the construction method, and there are differences in displacement. In order to eliminate the displacement difference, the along-perforation friction coefficient α of each well and each fracturing stage is introduced and defined as:

[0084] α=P well-perf / Q 2 (2)

[0085] (8) Repeat steps (3) to (7) to obtain the along-the-hole friction coefficient α of each section of the horizontal well that has been fractured in the target block using the same fracturing string and the same fracturing fluid system;

[0086] (9) Considering the measured depth in the middle of each fracturing section as the average fracturing fluid flow distance, the friction coefficient gradient λ of each fracturing section along the perforation is calculated using the friction coefficient value along the perforation of each fracturing section. mn (excluding the influence of flow distance of each fracturing stage),

[0087] λ mn =α mn / H mn (3)

[0088] Where m is the horizontal well number, 1≤m≤k, k is the total number of horizontal wells; n is the segment number, 1≤n≤j, j is the total number of fracturing segments in any horizontal well m; α mn is the friction coefficient along the perforation of the nth fracturing stage in well m; H mn It is the measured depth of the middle part of the nth fracturing section of well m, in meters.

[0089] (10) By comparing the friction coefficient gradient along the perforation of each well and section, the minimum value λ is obtained. min The perforation friction of the fracturing section corresponding to this minimum value can be ignored. Then, the along-perforation friction coefficient corresponding to this minimum value is the along-perforation friction coefficient gradient when the fracturing string and fracturing fluid system is used. The minimum along-perforation friction coefficient gradient λ is calculated using the following formula: min :

[0090] λ min =min(λ1,…,λ n ,…λ k ) (4)

[0091] (11) Calculate the friction resistance P along each well and each fracturing stagewell-mn ,

[0092] P well-mn =λ min H mn Q mn 2 (5)

[0093] Among them, P well-mn is the friction resistance along the nth fracturing stage of well m; Q mn It is the instantaneous displacement before stopping the pump in the nth fracturing stage of well m.

[0094] The method of this embodiment can be used for wells that have been fractured in the same region and use the same fracturing string and the same fracturing fluid system. By analyzing the data of the pump stop pressure in the previous fracturing wells in seconds and combining it with data statistical methods, the friction resistance along the string under the conditions of using the fracturing string and the fracturing fluid system can be quantitatively evaluated.

[0095] Example 2

[0096] This example takes a shale gas block in the Sichuan Basin as an example. Three horizontal wells in the block (a total of 55 fracturing stages) use the same fracturing fluid system and fracturing string. The second-by-second data of the construction pressure of each stage of the well are collected and sorted.

[0097] (1) Taking the first section of the first well as an example, the data of the pump stop time during fracturing operation were selected for analysis. According to the data, the corresponding pressure value at the pump stop time was 79.39 MPa, and the instantaneous displacement before pump stop was 14.5 m 3 / min.

[0098] (2) Taking the instantaneous pump stop time as the starting point (denoted as t p =0), according to the pressure P(t p ) and pump stop time t p The data can be used to obtain the subsequent pump shutdown time, pressure difference and pressure derivative (Bourdet derivative).

[0099] (3) On the double logarithmic pressure derivative curve, the first “hump” peak appears 48 seconds after the pump is stopped, and the corresponding pressure is 71.7 MPa. Therefore, the along-perforation friction of this fracturing section is 7.69 MPa.

[0100] (4) Repeat steps (1) to (3) to obtain the instantaneous displacement and the friction value along the perforation before stopping the pump for each well and each fracturing stage, see Figure 4 and Figure 5 .

[0101] (7) According to the instantaneous displacement of each fracturing stage before pumping is stopped, calculate the friction coefficient α along the perforation, see Figure 6 .

[0102] (8) Count the depth measurement in the middle of each fracturing section and calculate the friction gradient coefficient along the perforation of each fracturing section. Figure 7 The minimum value among the 55 fracturing stages is 6.76974×10 -6 The along-perforation friction coefficient corresponding to the minimum value is the along-perforation friction coefficient gradient when the fracturing string and fracturing fluid system is used.

[0103] (9) According to the obtained friction coefficient gradient along the way, calculate the friction resistance along each fracturing section, see Figure 8 .

[0104] Example 3

[0105] The present disclosure provides an electronic device, which includes: a memory storing executable instructions; a processor running the executable instructions in the memory to implement the above-mentioned post-fracturing analysis method for evaluating the friction resistance along the horizontal well fracturing string.

[0106] An electronic device according to an embodiment of the present disclosure includes a memory and a processor.

[0107] The memory is used to store non-temporary computer-readable instructions. Specifically, the memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may, for example, include read-only memory (ROM), hard disk, flash memory, etc.

[0108] The processor may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In one embodiment of the present disclosure, the processor is used to run the computer-readable instructions stored in the memory.

[0109] Those skilled in the art should be able to understand that in order to solve the technical problem of how to obtain a good user experience, the present embodiment may also include well-known structures such as a communication bus and an interface, and these well-known structures should also be included in the protection scope of the present disclosure.

[0110] For detailed description of this embodiment, reference may be made to the corresponding descriptions in the aforementioned embodiments, which will not be repeated here.

[0111] Example 4

[0112] An embodiment of the present disclosure provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the post-fracturing analysis method for evaluating the friction along the fracturing string of a horizontal well is implemented.

[0113] According to the computer-readable storage medium of the embodiment of the present disclosure, non-transitory computer-readable instructions are stored thereon. When the non-transitory computer-readable instructions are executed by a processor, all or part of the steps of the above-mentioned methods of each embodiment of the present disclosure are executed.

[0114] The above-mentioned computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or mobile hard disk), media with built-in rewritable non-volatile memory (e.g., memory card) and media with built-in ROM (e.g., ROM box).

[0115] Those skilled in the art should understand that the purpose of the above description of the embodiments of the present invention is only to exemplarily illustrate the beneficial effects of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to any given examples.

[0116] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A post-fracturing analysis method for evaluating the friction resistance along the fracturing string of a horizontal well, characterized in that: include: The fracturing sections of the fractured horizontal wells with the same fracturing string and the same fracturing fluid system are used as the analysis targets to calculate the along-perforation friction P of each well and each fracturing section. well-perf and along-the-perforation friction coefficient α; The friction value P along the perforation of each well and each fracturing stage is used. well-perf , calculate the along-the-perforation friction coefficient gradient λ of each well and each fracturing stage; Determine the friction coefficient gradient λ along the path based on the friction coefficient gradient λ along the path and perforation of each well and each fracturing stage min ; Using the friction coefficient gradient λ along the path min Calculate the friction resistance P along the way for each well and each fracturing stage well-mn ; Among them, the following formula is used to calculate the perforation friction resistance P of each well and each fracturing stage: well-perf : P well-perf = P(t p =0)-P(t p1 ) (1) Among them, P(t p =0) is the initial pressure value corresponding to the pump stopping, t p1 is the time when the friction along the perforation disappears, P(t p1 ) is the pressure corresponding to that moment; The following formula is used to calculate the along-the-perforation friction coefficient α of each well and each fracturing stage: α= P well-perf / Q 2 (2) Among them, Q is the instantaneous displacement before pump stop of each well and each fracturing stage; The following formula is used to calculate the friction coefficient gradient λ along the perforation of each well and each fracturing stage: mn : l mn =a mn / H mn (3) Where m is the horizontal well number, 1≤m≤k, k is the total number of horizontal wells; n is the segment number, 1≤n≤j, j is the total number of fracturing segments in any horizontal well m; α mn is the friction coefficient along the perforation of the nth fracturing stage in well m; H mn is the measured depth of the middle part of the nth fracturing stage of well m, in meters; Among them, the friction resistance P along each well and each fracturing section is calculated using the following formula: well-mn : P well-mn =λ min H mn Q mn 2 (5) Among them, P well-mn is the friction resistance along the nth fracturing stage of well m; Q mn It is the instantaneous displacement before stopping the pump in the nth fracturing stage of well m.

2. The post-fracturing analysis method for evaluating the friction along the horizontal well fracturing string according to claim 1, characterized in that: By comparing the friction coefficient gradient along the perforation of each well and each fracturing section, the minimum value is obtained as the friction coefficient gradient along the perforation when the fracturing string and fracturing fluid system are used; The minimum value of the friction coefficient gradient along the perforation is calculated using the following formula: min : l min =min(λ1,…,λ n ,…l k ) (4).

3. The post-fracturing analysis method for evaluating the friction along the horizontal well fracturing string according to claim 1, characterized in that: According to the pressure P(t p ) and pump stop time t p Data, obtain the pressure difference derivative curve; Determine the time t at which the friction along the perforation disappears on the pressure difference derivative curve p1 And record the corresponding pressure P(t p1 ).

4. The post-fracturing analysis method for evaluating the friction along the horizontal well fracturing string according to claim 3, characterized in that: On the pressure difference derivative curve, determine the time t of the first part with a slope of 1 and the subsequent "hump" peak p1 , t p1 The time is the time when the friction along the perforation disappears.

5. An electronic device, characterized in that: The electronic device comprises: A memory storing executable instructions; A processor, wherein the processor runs the executable instructions in the memory to implement the post-fracturing analysis method for evaluating the friction along the horizontal well fracturing string according to any one of claims 1 to 4.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the post-fracturing analysis method for evaluating the friction along the horizontal well fracturing string according to any one of claims 1 to 4 is implemented.

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