Post-compression analysis method, electronic device and storage medium

Abstract

The present invention proposes a post-fracturing analysis method, electronic equipment and storage medium. The post-fracturing analysis includes: calculating the perforation friction P along each fracturing stage well‑perf and tortuosity friction P tort ; Calculate the friction coefficient α along the perforation and the tortuosity friction coefficient β; Determine the minimum value λ of the gradient of the friction coefficient along the perforation min ; Calculate the perforation friction coefficient ζ of each fracturing stage n and perforation friction P perf‑n ; Calculate the friction resistance P along each fracturing stage well‑n and the friction coefficient along the way η n This method uses the actual data of the fracturing construction site and analyzes the change characteristics of the main fracturing pump stop pressure drop curve to quantitatively evaluate the friction resistance along the horizontal well, perforation friction resistance and tortuosity friction resistance during the fracturing process.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas field development, and in particular relates to an evaluation method for friction resistance of each section during staged and clustered fracturing of a horizontal well, an electronic device and a computer-readable storage medium. Background Art

[0002] During the hydraulic fracturing process, the fracturing fluid enters the cracks from the pump outlet through the ground pipeline, wellbore string and perforation holes. In each flow channel, pressure loss will be generated due to friction resistance. Calculating these pressure losses and analyzing their influencing factors are extremely critical for evaluating the effect of fracturing construction. Specifically, the pressure loss during the fracturing process can be summarized into two categories: along-the-well friction resistance and near-wellbore friction resistance. Among them, near-wellbore friction resistance can be divided into hole friction resistance generated by perforation holes and bending friction resistance generated in the near-wellbore area. The fracturing fluid must overcome along-the-well friction resistance, hole friction resistance and bending friction resistance when entering the cracks through the wellhead. Accurately evaluating fracturing friction resistance is extremely important for clarifying the optimization design space of fracturing, judging the pressure limit of ground construction equipment, and predicting construction risks.

[0003] At present, except for the near-wellbore friction resistance, there are prediction formulas for the friction resistance along the way and the friction resistance of the borehole. These methods all require the input of some parameters, such as the diameter of the perforation hole, the abrasion coefficient, the roughness coefficient of the wellbore, etc. The accuracy of the input value of these parameters directly affects the size of the calculation results. However, except for the inner diameter of the wellbore and the number of perforations, parameters such as the abrasion coefficient and the roughness coefficient of the wellbore are basically unavailable. Even if the parameters related to the perforation holes, such as the perforation diameter and the number of perforations, are known, the fracturing process will be affected by uncontrollable factors such as the position and number of fracturing cracks, non-uniform fluid inflow and proppant abrasion, and the predicted results will have a huge error with the actual results. Especially for the staged and clustered fracturing of horizontal wells, the construction pressures measured after the construction of each section are very different, and the existing calculation methods cannot accurately explain the friction resistance during the construction of each section.

[0004] In the on-site fracturing construction, in order to reduce the construction cost, only a very small number of wells are subjected to pre-fracturing diagnostic tests such as step injection test and bottom hole pressure test. Especially for horizontal well fracturing, the feasibility of conducting a pre-fracturing diagnostic test for each fracturing section is extremely low. Therefore, the fracturing friction of most wells and sections can only be analyzed using the main fracturing construction pressure data. When there is no step injection test and bottom hole pressure test data, it is difficult to reasonably interpret a single actual construction pressure curve. In actual engineering, it mainly relies on rough estimates, and can only roughly obtain the instantaneous pump stop pressure and total fracturing friction, but cannot obtain accurate friction along the way, perforation friction and tortuosity friction.

[0005] Therefore, a post-fracturing analysis method for evaluating the friction resistance of segmented and clustered fracturing in horizontal wells needs to be established in this field, which can use the actual data of the fracturing construction site to invert, analyze and quantitatively evaluate the friction resistance along the fracturing process, perforation friction resistance and tortuosity friction resistance. Summary of the invention

[0006] In view of the problem that there is a lack of suitable methods for conventional main fracturing construction pressure data in the prior art, and the actual fracturing friction resistance cannot be accurately obtained, the present invention provides a post-fracturing analysis method for evaluating the friction resistance of horizontal well segmented cluster fracturing. By using the actual data of the fracturing construction site and analyzing the main fracturing pump stop pressure drop curve, the friction resistance along the way, the perforation friction resistance and the tortuosity friction resistance are quantitatively evaluated. This method can provide technical support for the real-time evaluation of the post-fracturing effect at the hydraulic fracturing construction site and the subsequent optimization of fracturing construction.

[0007] According to one aspect of the present invention, a post-fracturing analysis method for evaluating the friction resistance of staged and clustered fracturing in horizontal wells is provided, comprising:

[0008] Calculate the perforation friction P along each fracturing stage well-perf and tortuosity friction P tort ;

[0009] Calculate the along-the-fracturing-perforation friction coefficient α and the tortuosity friction coefficient β of each fracturing stage;

[0010] Determine the minimum value of the friction coefficient gradient along the perforation min ;

[0011] Calculate the perforation friction coefficient ζ of each fracturing stage n and perforation friction P perf-n ;

[0012] Calculate the friction resistance P along each fracturing stage well-n and the friction coefficient along the way η n .

[0013] Further,

[0014] The following formula is used to calculate the perforation friction resistance P of each fracturing stage: well-perf and tortuosity friction P tort ,

[0015] P well-perf =P(t p =0)-P(t p1 ) (1)

[0016] P tort =P(t p1 )-P(t p2 ) (2)

[0017] Among them, P(t p1) is the time when the friction resistance along the perforation disappears t p1 The corresponding pressure, P(t p2 ) is the time when the circuitous friction disappears t p2 The corresponding instantaneous pump stop pressure, P(t p =0) is the initial pressure corresponding to when the pump is stopped.

[0018] Further, according to the pressure P(t p ) and pump stop time t p Data, obtain the pressure difference derivative curve;

[0019] Determine the time t at which the friction along the perforation disappears on the pressure difference derivative curve p1 and the time t at which the tortuosity friction disappears p2 , and record the corresponding pressure P(t p1 ) and P(t p2 ).

[0020] 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 resistance along the perforation disappears;

[0021] Determine the end time t of the first "hump" on the pressure difference derivative curve p2 , t p2 The time is the moment when the circuitous friction disappears.

[0022] Furthermore, the along-the-perforation friction coefficient α and the tortuosity friction coefficient β are calculated using the following formula:

[0023] α=P well-perf / Q 2 (3)

[0024] β=P tort / Q 0.5 (4)

[0025] Among them, Q is the instantaneous displacement before the pump stops.

[0026] Furthermore, the following formula is used to calculate the friction coefficient gradient λ along the perforation of the nth fracturing stage in the horizontal well: n :

[0027] λ n =α n / H n (5)

[0028] Where n is the horizontal well fracturing stage number, 1≤n≤k; k is the total number of fracturing stages; α n is the friction coefficient along the perforation of the nth fracturing stage; Hn is the depth measured in the middle of the nth fracturing stage, in m;

[0029] Based on the along-perforation friction coefficient gradient λ n Determine the minimum value of the friction coefficient gradient along the perforation min :

[0030] λ min =min(λ1,…,λ n ,…λ k ) (6).

[0031] Furthermore, the perforation friction coefficient ζ of any fracturing section of the horizontal well is calculated using the following formula: n and perforation friction P perf-n ,

[0032] ζ n =α n -H n λ min (7)

[0033] P perf-n =ζ n Q n 2 (8)

[0034] Among them, Q n It is the instantaneous displacement before pumping stops in the nth fracturing stage of the horizontal well.

[0035] Furthermore, the friction resistance P along each fracturing stage is calculated using the following formula: well-n and the friction coefficient along the way η n ,

[0036] P well-n =P well-perf-n -ζ n Q n 2 (9)

[0037] η n＝ P well-n / Q n 2 (10)

[0038] Among them, P well-perf-n is the along-the-perforation friction of the nth fracturing stage.

[0039] According to another aspect of the present invention, there is provided an electronic device, the electronic device comprising:

[0040] A memory storing executable instructions;

[0041] A processor runs the executable instructions in the memory to implement the post-fracturing analysis method for evaluating the fracturing friction of segmented and clustered horizontal wells.

[0042] 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 fracturing friction of segmented and clustered horizontal wells is implemented.

[0043] The present invention provides a post-fracture analysis method for evaluating the friction resistance of staged and clustered fracturing of horizontal wells. The method uses actual data from the fracturing construction site and analyzes the change characteristics of the main fracturing pump stop pressure drop curve to quantitatively evaluate the friction resistance along the fracturing process, perforation friction resistance and tortuosity friction resistance during the fracturing of horizontal wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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.

[0045] Figure 1 The present invention is a flow chart of a post-fracture analysis method for evaluating the fracturing friction of segmented and clustered horizontal wells.

[0046] Figure 2 This is the selection of the pump stop pressure second point data analysis segment according to an embodiment of the present invention.

[0047] Figure 3 Graph showing pressure difference and pressure difference derivative 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-fracture analysis method for evaluating the friction resistance of staged and clustered fracturing of horizontal wells. 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 way, perforation friction resistance and tortuosity friction resistance in the fracturing process of horizontal wells can be quantitatively evaluated.

[0050] like Figure 1 As shown, the post-fracturing analysis method for evaluating the fracturing friction of segmented and clustered horizontal wells according to the present invention comprises:

[0051] Calculate the friction resistance along the perforation path P well-perf and tortuosity friction P tort ;

[0052] Calculate the along-the-line perforation friction coefficient α and the tortuosity friction coefficient β;

[0053] Determine the minimum value of the friction coefficient gradient along the perforation min ;

[0054] Calculate the perforation friction coefficient ζ of each fracturing stage n and perforation friction P perf-n ;

[0055] Calculate the friction resistance P along each fracturing stage well-n and the friction coefficient along the way η n .

[0056] Preferably, the along-perforation friction resistance P can be calculated using the following formula: well-perf and tortuosity friction P tort ,

[0057] P well-perf =P(t p =0)-P(t p1 ) (1)

[0058] P tort =P(t p1 )-P(t p2 ) (2)

[0059] Among them, P(t p1 ) is the time when the friction resistance along the perforation disappears t p1 The corresponding pressure, P(t p2 ) is the time when the circuitous friction disappears t p2 The corresponding instantaneous pump stop pressure, P(t p =0) is the initial pressure corresponding to when the pump is stopped.

[0060] Furthermore, the data of the pump stop time during fracturing construction can be selected for analysis, and the instantaneous displacement Q before the pump stop and the initial pressure value P (t p =0). According to the pressure P after the pump is stopped (t p ) and pump stop time t p data, obtain a pressure differential derivative curve; determine the time t at which the friction resistance along the perforation disappears on the pressure differential derivative curve p1 and the time t at which the tortuosity friction disappears p2 , and record the corresponding pressure P(t p1 ) and P(t p2 ).

[0061] Specifically, on the pressure difference derivative curve, determine the time t when the first slope is 1 and the subsequent “hump” peak appears. p1 , t p1 The time is the time when the friction resistance along the perforation disappears; determine the end time t of the first "hump" on the pressure difference derivative curve p2 , t p2 The time is the moment when the circuitous friction disappears.

[0062] During staged and clustered fracturing of horizontal wells, the displacement of each section is affected by the formation and the construction method, and there are differences in displacement. In order to eliminate the displacement difference, it is preferred to introduce the along-perforation friction coefficient α and the tortuous friction coefficient β. The along-perforation friction coefficient α and the tortuous friction coefficient β can be calculated using the following formula:

[0063] α=P well-perf / Q 2 (3)

[0064] β=P tort / Q 0.5 (4)

[0065] Among them, Q is the instantaneous displacement before the pump stops.

[0066] Next, in order to distinguish the along-perforation friction resistance into along-perforation friction resistance and perforation friction resistance, it is assumed that there is a section of perforation friction resistance in the horizontal well that can be approximated to 0, that is, the along-perforation friction resistance of this section is all along-perforation friction resistance. Then the along-perforation friction resistance coefficient gradient corresponding to the minimum value is the along-perforation friction resistance coefficient gradient. The along-perforation friction resistance coefficient gradient λ of the nth fracturing section of the horizontal well can be calculated using the following formula n :

[0067] λ n =α n / H n (5)

[0068] Where n is the horizontal well fracturing stage number, 1≤n≤k; k is the total number of fracturing stages; α n is the friction coefficient along the perforation of the nth fracturing stage; H n It is the measured depth in the middle of the nth fracturing stage, in meters.

[0069] Based on the along-perforation friction coefficient gradient λ n Determine the minimum value of the friction coefficient gradient along the perforation min :

[0070] λ min =min(λ1,…,λ n ,…λ k ) (6)

[0071] Preferably, the perforation friction coefficient ζ of each fracturing stage can be calculated using the following formula: n and perforation friction P perf-n ,

[0072] ζ n =α n -H n λ min (7)

[0073] P perf-n =ζ n Q n 2 (8)

[0074] Among them, Q n It is the instantaneous displacement before pumping stops in the nth fracturing stage of the horizontal well.

[0075] Preferably, the friction resistance P along each fracturing stage can be calculated using the following formula: well-n and the friction coefficient along the way η n ,

[0076] P well-n =P well-perf-n -ζ n Q n 2 (9)

[0077] η n＝ P well-n / Q n 2 (10)

[0078] Among them, P well-perf-n is the along-the-perforation friction of the nth fracturing stage.

[0079] The method of the present invention can quantitatively evaluate the friction along the way, the perforation friction and the tortuosity friction during the fracturing process of the horizontal well by utilizing the actual data of the fracturing construction site.

[0080] 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.

[0081] Example 1

[0082] According to the post-fracturing analysis method for evaluating the friction resistance of staged and clustered fracturing of horizontal wells in this embodiment, the following steps may be included:

[0083] (1) The data of the pump stopping time during fracturing operation were selected for analysis, and the instantaneous displacement Q before the pump was stopped in each fracturing section and the initial pressure value P (t p=0), see Figure 2 ;

[0084] (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 Data, to obtain the subsequent pump shutdown time, pressure difference and pressure derivative (Bourdet derivative), see Figure 3 ;

[0085] (3) 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;

[0086] (4) After the peak of the first “hump”, the double logarithmic pressure derivative curve begins to drop rapidly. Find the end time of the first “hump” (the inflection point of the curve that drops rapidly after the “hump”, see Figure 3 ), and record the corresponding pressure P(t p2 ) and the appearance time t p2 ;t p2 The moment is the moment when the tortuosity friction disappears, P(t p2 ) is the instantaneous pump stop pressure (i.e. ISIP);

[0087] (5) Calculate the perforation friction P along the nth fracturing stage well-perf and tortuosity friction P tort

[0088] P well-perf =P(t p =0)-P(t p1 ) (1)

[0089] P tort =P(t p1 )-P(t p2 ) (2)

[0090] (6) 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 and the tortuosity friction coefficient β of each fracturing stage are introduced, which are:

[0091] α=P well-perf / Q 2 (3)

[0092] β=P tort / Q 0.5 (4)

[0093] (7) Calculate the friction coefficient gradient along the perforation of each fracturing stage in the horizontal well. The friction coefficient gradient along the perforation of the nth fracturing stage in the horizontal well can be calculated using the following formula: n :

[0094] λ n =α n / H n (5)

[0095] Where n is the horizontal well fracturing stage number, 1≤n≤k; k is the total number of fracturing stages; α n is the friction coefficient along the perforation of the nth fracturing stage; H n It is the measured depth in the middle of the nth fracturing stage, in meters.

[0096] (8) Find the fracturing section with the minimum value of the along-perforation friction coefficient gradient: In order to distinguish the along-perforation friction resistance into along-perforation friction resistance and perforation friction resistance. Assume that there is a section of perforation friction resistance in the horizontal well that can be approximated to 0, that is, the along-perforation friction resistance of this section is all along-perforation friction resistance. Then the along-perforation friction coefficient gradient corresponding to the minimum value is the along-perforation friction coefficient gradient. Based on the along-perforation friction coefficient gradient λ n Determine the minimum value of the friction coefficient gradient along the perforation min :

[0097] λ min =min(λ1,…,λ n ,…λ k ) (6)

[0098] (9) Calculate the friction coefficient ζ of the perforation of the nth fracturing stage n ,

[0099] ζ n =α n -H n λ x (7)

[0100] (10) Calculate the perforation friction P of the nth fracturing stage perf-n ,

[0101] P perf-n =ζ n Q n 2 (8)

[0102] Among them, Q n It is the instantaneous displacement before pumping stops in the nth fracturing stage of the horizontal well.

[0103] (11) Calculate the friction resistance P along each fracturing stage well-n and the friction coefficient along the way η n.

[0104] P well-n =P well-perf-n -ζ n Q n 2 (9)

[0105] η n＝ P well-n / Q n 2 (10)

[0106] Among them, P well-perf-n is the along-the-perforation friction of the nth fracturing stage.

[0107] Example 2

[0108] This embodiment takes a shale gas horizontal well in the Sichuan Basin as an example. The horizontal well has a total of 20 fracturing stages, and collects and organizes the second-by-second data of the construction pressure of each stage of the well.

[0109] (1) First, taking the first section as an example, the data of the pump stop time during fracturing construction was selected for analysis. According to the data, the corresponding pressure value at the pump stop time was 55.34 MPa, and the instantaneous displacement before the pump stop was 14.1 m 3 / min.

[0110] (2) Taking the pump stop time as the origin (t p =0), according to the pressure P(t p ) and pump stop time t p Data, plot double logarithmic pressure and its derivative;

[0111] (3) On the double logarithmic pressure derivative curve, the first “hump” peak appears 34 seconds after the pump is stopped, and the corresponding pressure is 43.94 MPa;

[0112] (4) After the peak of the first “hump”, the double logarithmic pressure derivative curve begins to drop rapidly. The inflection point of the rapid drop curve after the first “hump” occurs 52 seconds after the pump is stopped, and the corresponding pressure value is 32.44 MPa (instantaneous pump stop pressure).

[0113] (5) Calculate the friction resistance P of the first stage of fracturing along the perforation well-perf is 11.4MPa, and the tortuosity friction P tort 11.5MPa;

[0114] (6) Repeat steps (1) to (5) to obtain the corresponding pressure value at the pump stop time of each fracturing stage, the instantaneous displacement before pump stop, the along-perforation friction resistance, the tortuous friction resistance, and the instantaneous pump stop pressure value, see Table 1.

[0115] Table 1 Construction pressure curve

[0116]

[0117]

[0118] (7) According to the instantaneous displacement of each fracturing stage before pumping is stopped, the along-the-fracturing-perforation friction coefficient α and the tortuosity friction coefficient β of each fracturing stage are calculated. The calculation results are shown in Table 2.

[0119] Table 2 Friction coefficients along the perforation and tortuosity of each section

[0120] Segment number Friction coefficient along the perforation α Torsion friction coefficient β 1 0.057 0.058 2 0.093 0.110 3 0.157 0.223 4 0.101 0.056 5 0.264 0.347 6 0.237 0.595 7 0.281 0.633 8 0.087 0.021 9 0.088 0.085 10 0.074 0.055 11 0.170 0.094 12 0.111 0.087 13 0.087 0.012 14 0.128 0.115 15 0.188 0.167 16 0.133 0.129 17 0.183 0.124 18 0.215 0.132 19 0.099 0.122 20 0.049 0.023

[0121] (8) Count the depth measurement in the middle of each fracturing section and calculate the friction gradient coefficient λ along the perforation of each fracturing section n , and then get the minimum value of the friction coefficient gradient along the perforation min , see Table 3. It can be seen that the friction gradient coefficient along the first section is the smallest, which is 1.019761×10 -5 Then, the along-perforation friction obtained by the first stage calculation can be approximated as the along-the-way friction.

[0122] Table 3 Friction gradient coefficient along each section - perforation

[0123] Segment number Depth of the middle of each section / m Friction gradient coefficient λ along the perforation 1 5623 <![CDATA[1.019761×10 -5 ]]> 2 5561 <![CDATA[1.664872×10 -5 ]]> 3 5482 <![CDATA[2.86098×10 -5 ]]> 4 5383 <![CDATA[1.876801×10 -5 ]]> 5 5305 <![CDATA[4.979579×10 -5 ]]> 6 5215 <![CDATA[4.541906×10 -5 ]]> 7 5146 <![CDATA[5.453265×10 -5 ]]> 8 5057 <![CDATA[1.724122×10 -5 ]]> 9 5057 <![CDATA[1.740859×10 -5 ]]> 10 4978 <![CDATA[1.477661×10 -5 ]]> 11 4894 <![CDATA[3.473254×10 -5 ]]> 12 4818 <![CDATA[2.300608×10 -5 ]]> 13 4746 <![CDATA[1.824418×10 -5 ]]> 14 4676 <![CDATA[2.745649×10 -5 ]]> 15 4602 <![CDATA[4.094352×10 -5 ]]> 16 4529 <![CDATA[2.935047×10 -5 <!-- 7 -->]]> 17 4456 <![CDATA[4.102062×10 -5 ]]> 18 4383 <![CDATA[4.909139×10 -5 ]]> 19 4310 <![CDATA[2.303271×10 -5 ]]> 20 4237 <![CDATA[1.166886×10 -5 ]]>

[0124] (9) According to the friction resistance of the fracturing fluid obtained in the first stage, the friction resistance coefficient along each fracturing stage is calculated, and then the friction resistance coefficient ζ of each perforation stage is obtained. n , see Table 4.

[0125] Table 4 Friction coefficient of each perforation section

[0126]

[0127]

[0128] (10) According to the pump stop displacement of each stage, the instantaneous perforation friction resistance and the friction resistance along the way of each fracturing stage at the pump stop time are comprehensively calculated, see Table 5.

[0129] Table 5 Summary of the interpretation results of instantaneous fracturing friction at each pump stop time

[0130]

[0131] The method of this embodiment 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 way, perforation friction resistance and tortuosity friction resistance in the horizontal well fracturing process can be quantitatively evaluated.

[0132] Example 3

[0133] 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 of segmented and clustered fracturing of horizontal wells.

[0134] An electronic device according to an embodiment of the present disclosure includes a memory and a processor.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] For detailed description of this embodiment, reference may be made to the corresponding descriptions in the aforementioned embodiments, which will not be repeated here.

[0139] Example 4

[0140] The 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 fracturing friction of segmented and clustered horizontal wells is implemented.

[0141] 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.

[0142] 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).

[0143] 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.

[0144] 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 of staged and clustered fracturing in horizontal wells, characterized in that: include: Calculate the perforation friction P along each fracturing stage well-perf and tortuosity friction P tort ; Calculate the along-the-fracturing-perforation friction coefficient α and the tortuosity friction coefficient β of each fracturing stage; Determine the minimum value of the friction coefficient gradient along the perforation min ; Calculate the perforation friction coefficient ζ of each fracturing stage n and perforation friction P perf-n ; Calculate the friction resistance P along each fracturing stage well-n and the friction coefficient along the way η n ; The following formula is used to calculate the perforation friction resistance P of each fracturing stage: well-perf and tortuosity friction P tort , P well-perf = P(t p =0)-P(t p1 ) (1) P tort = P(t p1 )-P(t p2 ) (2) Among them, P(t p1 ) is the time when the friction resistance along the perforation disappears t p1 The corresponding pressure, P(t p2 ) is the time when the circuitous friction disappears t p2 The corresponding instantaneous pump stop pressure, P(t p =0) is the initial pressure corresponding to the pump stopping; The following formula is used to calculate the along-the-perforation friction coefficient α and the tortuosity friction coefficient β: α= P well-perf / Q 2 (3) β = P tort / Q 0.5 (4) Among them, Q is the instantaneous displacement before the pump stops; The perforation friction coefficient ζ of each fracturing stage is calculated using the following formula: n and perforation friction P perf-n , g n =a n -H n l min (7) P perf-n =ζ n Q n 2 (8) Among them, Q n is the instantaneous displacement before pump stop of the nth fracturing stage of the horizontal well; The friction resistance P along the nth fracturing stage is calculated using the following formula: well-n and the friction coefficient along the way η n , P well-n =P well-perf-n -ζ n Q n 2 (9) the n＝ P well-n / Q n 2 (10) Among them, P well-perf-n is the along-the-perforation friction of the nth fracturing stage.

2. The post-fracturing analysis method for evaluating the friction resistance of staged and clustered fracturing in horizontal wells 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 the time t at which the tortuosity friction disappears p2 , and record the corresponding pressure P(t p1 ) and P(t p2 ).

3. The post-fracturing analysis method for evaluating the friction resistance of staged and clustered fracturing in horizontal wells according to claim 2, 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 resistance along the perforation disappears; Determine the end time t of the first "hump" on the pressure difference derivative curve p2 , t p2 The time is the moment when the circuitous friction disappears.

4. The post-fracturing analysis method for evaluating the friction resistance of staged and clustered fracturing in horizontal wells according to claim 1, characterized in that: The following formula is used to calculate the friction coefficient gradient λ along the perforation of the nth fracturing stage in the horizontal well: n : l n =a n / H n (5) Where n is the horizontal well fracturing stage number, 1≤n≤k; k is the total number of fracturing stages; α n is the friction coefficient along the perforation of the nth fracturing stage; H n is the depth measured in the middle of the nth fracturing stage, in m; Based on the along-perforation friction coefficient gradient λ n Determine the minimum value of the friction coefficient gradient along the perforation min : l min =min(λ1,…,λ n ,…l k ) (6).

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 fracturing friction resistance of segmented and clustered horizontal wells 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 fracturing friction of segmented and clustered horizontal wells according to any one of claims 1 to 4 is implemented.

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