Method and device for determining hydraulic fracturing temporary plugging transformation effect and computer equipment

Abstract

The invention provides a method and device for determining a hydraulic fracturing temporary plugging transformation effect and computer equipment. On the basis of the method, a first water hammer wave signal before temporary plugging operation and a second water hammer wave signal after temporary plugging operation of a current transformation well section of a target well are obtained, and the cepstrum response energy proportion before temporary plugging and the cepstrum response energy proportion after temporary plugging of each cluster of cracks in the current transformation well section are determined through cepstrum operation according to the first water hammer wave signal before temporary plugging operation and the second water hammer wave signal after temporary plugging operation; determining the temporary plugging efficiency of each cluster of cracks in combination with a first type of distribution function constructed based on the cepstrum response energy proportion of each cluster of cracks before temporary plugging; meanwhile, according to the cepstrum response energy proportion before and after temporary plugging of each cluster crack in the current transformation well section, in combination with a second type of distribution function constructed based on the cepstrum response energy proportion during well section crack uniform development, determining a temporary plugging efficiency penalty coefficient of each cluster crack; and the temporary plugging efficiency and the temporary plugging efficiency penalty coefficient of each cluster of cracks in the current transformed well section are used in a combined mode, and the temporary plugging transformation effect of the current transformed well section is accurately determined.

Description

Technical Field

[0001] This specification belongs to the field of oil and gas production technology, and in particular relates to a method, device and computer equipment for determining the temporary plugging and transformation effect of hydraulic fracturing. Background Art

[0002] Hydraulic fracturing is a key engineering tool for the efficient development of unconventional oil and gas. Temporary plugging operations are often used to enhance the effectiveness of hydraulic fracturing. However, existing methods often rely on the experience of technicians, making it difficult to objectively and quantitatively assess the effectiveness of temporary plugging operations, which in turn impacts subsequent hydraulic fracturing operations.

[0003] To address the above issues, no effective solutions have been proposed so far. Summary of the Invention

[0004] This specification provides a method, device and computer equipment for determining the temporary plugging transformation effect of hydraulic fracturing, which can comprehensively and reasonably evaluate the temporary plugging operation of the transformed well section and objectively and accurately determine the temporary plugging transformation effect of the temporary plugging operation for the transformed well section in a quantitative manner.

[0005] This specification provides a method for determining the temporary plugging effect of hydraulic fracturing, including:

[0006] Obtaining a first water hammer wave signal before temporary plugging operation of the current reformed well section of the target well, and a second water hammer wave signal after the temporary plugging operation;

[0007] According to the first water hammer wave signal and the second water hammer wave signal, the cepstrum response energy ratio of each cluster of fractures in the current well section before temporary plugging and the cepstrum response energy ratio of each cluster of fractures in the current well section after temporary plugging are determined by cepstrum response calculation;

[0008] According to the cepstrum response energy ratio of each cluster of fractures in the current well section before temporary plugging, a first-class distribution function of the cepstrum response energy ratio of each cluster of fractures in the current well section is constructed;

[0009] The temporary plugging efficiency of each cluster of fractures in the current stimulation section is determined based on the cepstral response energy ratio before and after temporary plugging, as well as the first-class distribution function. The temporary plugging efficiency is used to characterize the degree of change in the cepstral response energy ratio of the fractures after the temporary plugging operation.

[0010] A temporary plugging efficiency penalty coefficient for each cluster of fractures in the current stimulated well section is determined based on the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current stimulated well section, as well as a preset penalty function. The preset penalty function is constructed based on a second-class distribution function; the second-class distribution function is constructed using the cepstral response energy ratio when fractures in the well section are uniformly developed.

[0011] The temporary plugging effect of the temporary plugging operation on the current well section is determined based on the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each cluster of fractures in the current well section.

[0012] In one embodiment, the temporary plugging effect of the temporary plugging operation on the current stimulated well section is determined based on the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each cluster of fractures in the current stimulated well section, including:

[0013] Based on the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each cluster of fractures in the current stimulation section, the corrected temporary plugging efficiency of each cluster of fractures in the current stimulation section is determined. The corrected temporary plugging efficiency is used to characterize the stimulation effect of the temporary plugging operation on the fractures.

[0014] According to the corrected temporary plugging efficiency of each cluster of fractures in the current well section, the temporary plugging efficiency of the current well section is determined;

[0015] The temporary plugging transformation effect of the temporary plugging operation for the current transformed well section is determined based on the temporary plugging efficiency of the current transformed well section and the preset efficiency threshold parameter.

[0016] In one embodiment, obtaining a first water hammer wave signal before a temporary plugging operation of a current reformed well section of a target well and a second water hammer wave signal after the temporary plugging operation includes:

[0017] Stopping the pumping assembly to stimulate a first water hammer wave in the target well; and collecting a water hammer wave signal of a current reformed well section of the target well through a sensor as the first water hammer wave signal;

[0018] Perform temporary plugging operations on the currently transformed well section;

[0019] When the temporary plugging operation is completed, the pumping assembly is stopped to stimulate a second water hammer wave in the target well; and a water hammer wave signal of the current reformed well section of the target well is collected by a sensor as the second water hammer wave signal.

[0020] In one embodiment, based on the first water hammer signal and the second water hammer signal, the cepstrum response energy ratio of each cluster of fractures in the current well section before temporary plugging and the cepstrum response energy ratio of each cluster of fractures in the current well section after temporary plugging are determined by cepstrum response calculation, including:

[0021] The cepstrum response energy ratio of each cluster of fractures in the current stimulation section before temporary plugging is determined based on the first water hammer wave signal through cepstrum response calculation in the following manner:

[0022] Dividing the first water hammer wave signal into a plurality of signal windows; and performing cepstrum calculation on the plurality of signal windows respectively to obtain time-energy spectra of the water hammer signal cepstrum of the plurality of signal windows;

[0023] According to the time-energy spectra of the water hammer signal cepstrum of multiple signal windows, the corresponding time-energy curve is obtained by calculating the cumulative response energy of the same cepstrum of multiple signal windows;

[0024] According to the water hammer wave velocity, the time-energy curve is converted into the corresponding depth-energy curve;

[0025] According to the depth-energy curve, the cepstrum response energy density of each cluster of fractures in the current stimulation section before temporary plugging is determined;

[0026] According to the cepstrum response energy density of each cluster of fractures in the current stimulation well section before temporary plugging, the cepstrum response energy ratio of each cluster of fractures in the current stimulation well section before temporary plugging is calculated.

[0027] In one embodiment, the cepstrum response energy density of each cluster of fractures in the current stimulated well section before temporary plugging is determined based on the depth-energy curve, including:

[0028] The cepstrum response energy density of the current cluster fractures in the current stimulation section before temporary plugging is determined according to the following formula:

[0029]

[0030] Among them, P i is the energy density of the cepstrum response before temporary plugging of the current cluster cracks, i is the crack number of the current cluster cracks, D is the depth, P(D) represents the depth-energy curve, d i is the depth corresponding to the maximum value of the energy density of the cepstrum response before the temporary plugging of the current cluster cracks, d a is the effective response distance between the current cluster of cracks and the previous cluster of cracks, d b is the effective response distance between the current cluster of cracks and the next cluster of cracks.

[0031] In one embodiment, the temporary plugging efficiency of each cluster of fractures in the current stimulation well section is determined based on the cepstral response energy ratio before temporary plugging, the cepstral response energy ratio after temporary plugging, and the first-class distribution function of each cluster of fractures in the current stimulation well section, including:

[0032] The temporary plugging efficiency of the current cluster fractures in the current stimulation well section is determined according to the following formula:

[0033]

[0034] Among them, E i is the temporary plugging efficiency of the current cluster fracture in the current stimulation section, i is the fracture number of the current cluster fracture, R is the cepstrum response energy ratio, R std is the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed, R i1 is the cepstrum response energy ratio of the current cluster fractures in the current stimulation section before temporary plugging, R i2 is the cepstrum response energy ratio of the current cluster fractures in the current stimulated well section after temporary plugging.

[0035] In one embodiment, a temporary plugging efficiency penalty coefficient for each cluster of fractures in the current stimulation well section is determined based on the cepstrum response energy ratio before temporary plugging, the cepstrum response energy ratio after temporary plugging, and a preset penalty function, including:

[0036] The temporary plugging efficiency penalty coefficient of the current cluster fracture in the current stimulation well section is determined as follows:

[0037]

[0038] Among them, c i The temporary plugging efficiency penalty coefficient of the current cluster fracture in the current transformation well section, i is the fracture number of the current cluster fracture, R is the cepstrum response energy ratio, R std is the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed, R i1 is the cepstrum response energy ratio of the current cluster fractures in the current stimulation section before temporary plugging, R i2 is the cepstrum response energy ratio of the current cluster fractures in the current stimulated well section after temporary plugging.

[0039] In one embodiment, the temporary plugging effect of the temporary plugging operation on the current well section is determined based on the temporary plugging efficiency of the current well section and a preset efficiency threshold parameter, including:

[0040] Comparing the temporary plugging efficiency of the current reformed well section with a preset first efficiency threshold to obtain a corresponding comparison result;

[0041] According to the comparison result, when it is determined that the temporary plugging efficiency of the current transformed well section is less than a preset first efficiency threshold, it is determined that the temporary plugging transformation effect of the temporary plugging operation for the current transformed well section does not meet the requirements.

[0042] This specification also provides a device for determining the temporary plugging effect of hydraulic fracturing, including:

[0043] An acquisition module is used to acquire a first water hammer wave signal before a temporary plugging operation of the current reformed well section of the target well, and a second water hammer wave signal after the temporary plugging operation;

[0044] A first determination module is configured to determine, based on the first water hammer wave signal and the second water hammer wave signal, a cepstrum response energy ratio of each cluster of fractures in the current reformed well section before temporary plugging and a cepstrum response energy ratio of each cluster of fractures in the current reformed well section after temporary plugging by performing a cepstrum response calculation;

[0045] A construction module is used to construct a first-class distribution function of the cepstrum response energy ratio of each cluster of fractures in the current well section according to the cepstrum response energy ratio of each cluster of fractures in the current well section before temporary plugging;

[0046] The second determination module is configured to determine the temporary plugging efficiency of each cluster of fractures in the current stimulation well section based on the cepstral response energy ratio of each cluster of fractures before and after temporary plugging, and the first-class distribution function. The temporary plugging efficiency is used to represent the degree of change in the cepstral response energy ratio of the fractures after the temporary plugging operation.

[0047] The third determination module is configured to determine a temporary plugging efficiency penalty coefficient for each cluster of fractures in the current stimulated well section based on the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current stimulated well section, and a preset penalty function; wherein the preset penalty function is constructed based on a second-type distribution function; the second-type distribution function is constructed using the cepstral response energy ratio when fractures in the well section are uniformly developed;

[0048] The fourth determination module is used to determine the temporary plugging effect of the temporary plugging operation on the current well section according to the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each cluster of fractures in the current well section.

[0049] This specification also provides a computer device, including a processor and a memory for storing processor-executable instructions, wherein the processor implements the steps of the method for determining the temporary plugging transformation effect of hydraulic fracturing when executing the instructions.

[0050] Based on the method, device and computer equipment for determining the temporary plugging effect of hydraulic fracturing provided in this specification, the first water shock wave signal before the temporary plugging operation of the current transformed well section of the target well and the second water shock wave signal after the temporary plugging operation can be obtained respectively; according to the first water shock wave signal and the second water shock wave signal, the cepstrum response energy ratio of each cluster of cracks in the current transformed well section before and after the temporary plugging is determined by cepstrum operation and is used, combined with the first type of distribution function constructed based on the cepstrum response energy ratio of each cluster of cracks before the temporary plugging, to determine the variable that can characterize the cepstrum response ability of the cracks after the temporary plugging operation. The temporary plugging efficiency of each fracture cluster with different degrees of saturation is evaluated. Furthermore, a penalty function based on the trend of fracture energy response ratio is constructed based on the cepstral response energy ratio of each fracture cluster in the current stimulated well section before and after temporary plugging, combined with a second-type distribution function constructed based on the cepstral response energy ratio when fractures are uniformly developed in the well section. This penalty function is used to determine the temporary plugging efficiency penalty coefficient for each fracture cluster in the current stimulated well section. The temporary plugging efficiency of each fracture cluster in the current stimulated well section and the temporary plugging efficiency penalty coefficient are then combined to determine the overall temporary plugging effect of the temporary plugging operation on the current stimulated well section. This allows for a more comprehensive and reasonable evaluation of the temporary plugging operation in the stimulated well section, and objectively and accurately quantifies the temporary plugging effect of the temporary plugging operation on the stimulated well section. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of this specification, the following is a brief introduction to the drawings required for use in the embodiments. The drawings described below are only some of the embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] Figure 1 This is a flow chart of a method for determining the temporary plugging effect of hydraulic fracturing provided by an embodiment of this specification;

[0053] Figure 2 This is a schematic diagram of an embodiment of a method for determining the temporary plugging effect of hydraulic fracturing provided by an embodiment of this specification, in a scenario example;

[0054] Figure 3 This is a schematic diagram of an embodiment of a method for determining the temporary plugging effect of hydraulic fracturing provided by an embodiment of this specification, in a scenario example;

[0055] Figure 4 This is a schematic diagram of the structure of a computer device provided by one embodiment of this specification;

[0056] Figure 5 This is a schematic diagram of the structure of a device for determining the temporary plugging and transformation effect of hydraulic fracturing provided by an embodiment of this specification;

[0057] Figure 6 This is a schematic diagram of an embodiment of a method for determining the temporary plugging effect of hydraulic fracturing provided by an embodiment of this specification, in a scenario example;

[0058] Figure 7 This is a schematic diagram of an embodiment of a method for determining the temporary plugging effect of hydraulic fracturing provided by an embodiment of this specification, in a scenario example;

[0059] Figure 8 This is a schematic diagram of an embodiment of a method for determining the temporary plugging effect of hydraulic fracturing provided by an embodiment of this specification, in a scenario example;

[0060] Figure 9 This is a schematic diagram of an embodiment of a method for determining the temporary plugging effect of hydraulic fracturing provided by an embodiment of this specification, in a scenario example;

[0061] Figure 10 This is a schematic diagram of an embodiment of a method for determining the temporary plugging effect of hydraulic fracturing provided by an embodiment of this specification, in a scenario example;

[0062] Figure 11 It is a schematic diagram of an embodiment of a method for determining the temporary plugging transformation effect of hydraulic fracturing provided by an embodiment of this specification in a scenario example. DETAILED DESCRIPTION

[0063] To help those skilled in the art better understand the technical solutions in this specification, the following will provide a clear and complete description of the technical solutions in the embodiments of this specification, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of them. All other embodiments derived by those skilled in the art based on the embodiments in this specification without creative effort shall fall within the scope of protection of this specification.

[0064] It should be noted that the user-related information and data involved in the embodiments of this specification are all information and data authorized by the user or fully authorized by relevant parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data comply with relevant laws, regulations and standards, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entrances for users or relevant parties to choose to authorize or refuse.

[0065] It should also be noted that in the embodiments of this specification, certain software, components, models and other existing solutions in the industry may be mentioned. They should be regarded as exemplary and their purpose is only to illustrate the feasibility of implementing the technical solution of this application, but it does not mean that the applicant has or will necessarily use the solution.

[0066] See Figure 1 As shown, the embodiment of this specification provides a method for determining the temporary plugging effect of hydraulic fracturing. The specific implementation of this method may include the following:

[0067] S101: Acquire a first water hammer wave signal before a temporary plugging operation of a current reformed section of a target well, and a second water hammer wave signal after the temporary plugging operation;

[0068] S102: determining, by cepstrum response calculation based on the first water hammer signal and the second water hammer signal, the cepstrum response energy ratio of each cluster of fractures in the current stimulated well section before temporary plugging and the cepstrum response energy ratio of each cluster of fractures in the current stimulated well section after temporary plugging;

[0069] S103: constructing a first-class distribution function of the cepstral response energy ratio of each cluster of fractures in the current well section according to the cepstral response energy ratio of each cluster of fractures in the current well section before temporary plugging;

[0070] S104: determining the temporary plugging efficiency of each cluster of fractures in the current stimulation well section based on the cepstral response energy ratio before temporary plugging, the cepstral response energy ratio after temporary plugging, and the first-class distribution function; wherein the temporary plugging efficiency is used to represent the degree of change in the cepstral response energy ratio of the fractures after the temporary plugging operation;

[0071] S105: determining a temporary plugging efficiency penalty coefficient for each cluster of fractures in the current stimulated well section based on the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current stimulated well section, and a preset penalty function; wherein the preset penalty function is constructed based on a second-type distribution function; the second-type distribution function is constructed using the cepstral response energy ratio when fractures in the well section are uniformly developed;

[0072] S106: Determine the temporary plugging effect of the temporary plugging operation on the current well section according to the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each cluster of fractures in the current well section.

[0073] The above-mentioned currently transformed well section can be specifically understood as a portion of the well section in the target well that is currently undergoing hydraulic fracturing in order to form a complex fracture network and increase the transformed volume of the reservoir and the oil and gas recovery rate.

[0074] The above-mentioned hydraulic fracturing can be specifically understood as a technology for increasing oil and gas well production by fracturing bedrock formations using pressurized liquid. Specifically, a pumping assembly (e.g., a surface high-pressure pump, etc.) can be used to squeeze a fracturing fluid with a high viscosity (e.g., water, etc.) into the oil layer through the wellbore. When the injection rate of the fracturing fluid exceeds the absorption capacity of the oil layer, a very high pressure can be formed on the oil layer at the bottom of the well, exceeding the fracture pressure of the rock, causing the oil layer to be squeezed open and cracks to form; then, a sand-carrying fluid containing proppants (e.g., quartz sand) is injected to allow the proppants to enter the cracks and keep the cracks open. After the high-viscosity fracturing fluid automatically degrades and is discharged from the wellbore, cracks are left behind, thereby establishing new oil and gas fluid channels and increasing the production of oil and gas wells.

[0075] Temporary plugging (also known as temporary fracturing) can be understood as the temporary sealing of specific areas or channels during oil and gas well operations using a temporary plugging agent to achieve specific engineering objectives, such as diversion fracturing. During hydraulic fracturing, temporary plugging can force the fracturing fluid to reopen fractures in other locations or form a well-developed fracture network, thereby increasing the reservoir's stimulated volume and oil and gas recovery rate.

[0076] The above-mentioned first water shock wave signal and the second water shock wave signal can specifically be a fracturing pump-off water shock signal (i.e., pressure wave signal data of the fracturing pump-off water shock wave). The above-mentioned fracturing pump-off water shock wave is specifically a fluid oscillation pressure wave formed in the wellbore due to the elasticity of the wellbore pipe wall and the compressibility of the fluid when the fluid is stopped being pumped into the wellhead during the hydraulic fracturing process. Due to differences in influencing factors such as wellbore parameters, geological parameters, and fluid parameters of different wells, the fracturing pump-off water shock signals expressed by the fracturing pump-off water shock waves (or water shock pressure waves) formed in different wells under different circumstances will also be different. Therefore, the fracturing pump-off water shock signals expressed by the fracturing pump-off water shock waves can be used to analyze the characteristics of the underground crack morphology, quantity, size, development (for example, degree of opening), etc.

[0077] The first type of distribution function can be constructed based on the cepstral response energy ratio of each fracture cluster in the current stimulation section before temporary plugging, combined with the cepstral response energy ratio when fractures in the current stimulation section are uniformly developed. The second type of distribution function can be constructed based on the cepstral response energy ratio when fractures in the current stimulation section are uniformly developed.

[0078] In specific implementation, hydraulic fracturing can be performed on the current stimulated well section of the target well according to the fracturing plan, wherein the fracturing plan records the perforation clusters planned to be opened by hydraulic fracturing in the current stimulated well section.

[0079] During hydraulic fracturing operations in the target well's current stimulated section, temporary plugging can be performed based on the specific construction conditions to ensure optimal development of multiple perforation clusters, thereby improving the overall fracturing effectiveness of the stimulated section. The purpose of temporary plugging is to specifically seal off the fractures in the dominant cluster prior to temporary plugging, while simultaneously opening the fractures in the less dominant cluster, thereby ensuring optimal and balanced development of the planned multiple fractures.

[0080] In specific implementation, before and after the corresponding temporary plugging operation is performed on the current transformed well section in the above manner, the first water hammer wave signal before the temporary plugging operation of the current transformed well section of the target well and the second water hammer wave signal after the temporary plugging operation can be obtained respectively; and based on the method for determining the temporary plugging transformation effect of hydraulic fracturing provided in this specification, the first water hammer wave signal and the second water hammer wave signal are first used to calculate the temporary plugging efficiency that can more objectively and accurately reflect the relative changes of each cluster of cracks before and after the temporary plugging through cepstrum response calculation; then a penalty function based on the change trend of the crack energy response ratio is introduced and used to calculate the temporary plugging efficiency for each cluster of cracks. The temporary plugging efficiency penalty coefficient of the cluster fractures can be used to determine the temporary plugging efficiency of each cluster fracture and the corresponding temporary plugging efficiency penalty coefficient. The modified temporary plugging efficiency based on the hydraulic fracturing fracture transformation optimization scenario can better reflect the transformation effect required by the construction. The temporary plugging efficiency of the temporary plugging operation in the current transformation well section can be determined based on the modified temporary plugging efficiency of each cluster fracture in the current transformation well section. The temporary plugging operation can be comprehensively and reasonably evaluated, and the temporary plugging transformation effect of the temporary plugging operation can be accurately determined in a quantitative manner, providing accurate and valuable reference and guidance for subsequent construction operations.

[0081] In some embodiments, the above-mentioned obtaining of the first water hammer wave signal before the temporary plugging operation of the current reformed well section and the second water hammer wave signal after the temporary plugging operation may include the following steps during implementation:

[0082] S1: Stop the pumping assembly to generate a first water hammer wave in the target well; and collect a water hammer wave signal of the current reformed well section of the target well through a sensor as the first water hammer wave signal;

[0083] S2: Temporary plugging operation is performed on the current well section;

[0084] S3: When the temporary plugging operation is completed, the pumping assembly is stopped to stimulate a second water hammer wave in the target well; and a water hammer wave signal of the current reformed well section of the target well is collected by a sensor as the second water hammer wave signal.

[0085] When specifically collecting the first water hammer wave signal, the operation of the pumping assembly can be stopped before performing the temporary plugging operation to stimulate a pump-stop water hammer wave (recorded as the first water hammer wave) in the target well; at the same time, pressure data based on the water hammer wave is collected through pressure sensors arranged at relevant positions as the first water hammer wave signal about the current reformed well section of the target well.

[0086] After collecting the first water hammer signal, a temporary plugging operation is performed on the current section being treated. After the temporary plugging operation is completed, the pumping assembly is stopped to generate another pump-off water hammer (referred to as the second water hammer) in the target well. Simultaneously, pressure data based on this water hammer is collected via pressure sensors located at relevant locations as the second water hammer signal for the current treated section of the target well.

[0087] In some embodiments, the cepstrum response energy ratio of each cluster of fractures in the current reformed well section before temporary plugging and the cepstrum response energy ratio of each cluster of fractures in the current reformed well section after temporary plugging are determined by cepstrum response calculation based on the first water hammer wave signal and the second water hammer wave signal. When specifically implemented, refer to Figure 2 The cepstrum response energy ratio of each cluster of fractures in the current stimulation section before temporary plugging can be determined by cepstrum response calculation based on the first water hammer wave signal in the following manner:

[0088] S1: Divide the first water hammer wave signal into multiple signal windows; and perform cepstrum calculation on the multiple signal windows respectively to obtain time-energy spectra of the water hammer signal cepstrum of the multiple signal windows;

[0089] S2: Based on the time-energy spectra of the water hammer signal cepstrum of multiple signal windows, the corresponding time-energy curve is obtained by calculating the cumulative response energy of the same cepstrum of multiple signal windows;

[0090] S3: According to the water hammer wave velocity, the time-energy curve is converted into the corresponding depth-energy curve;

[0091] S4: determining the cepstrum response energy density of each cluster of fractures in the current stimulation section before temporary plugging based on the depth-energy curve;

[0092] S5: Calculating the cepstrum response energy ratio of each cluster of fractures in the current stimulation well section before temporary plugging based on the cepstrum response energy density of each cluster of fractures in the current stimulation well section before temporary plugging.

[0093] Among them, the energy density of the cepstrum response of the crack can characterize the reflection signal energy of the corresponding single crack.

[0094] It should be noted that, considering the environmental factors when collecting the first water hammer wave signal before temporary plugging and the environmental factors when collecting the second water hammer wave signal after temporary plugging, there will be differences. This leads to the fact that using the change in the cepstrum response energy density of a single crack before and after temporary plugging to judge the development of the crack is prone to errors. Therefore, after determining the cepstrum response energy density of each cluster of cracks, the cepstrum response energy density of each cluster of cracks is further combined with the cepstrum response energy density of other clusters of cracks. By calculating the ratio of the cepstrum response energy density of a single crack to the sum of the cepstrum response energy densities of all cracks, the cepstrum response energy ratio of each cluster of cracks is obtained. This cepstrum response energy ratio can then be used instead of the cepstrum response energy density to effectively eliminate the error introduced by different environmental factors and more accurately analyze the development of each cluster of cracks.

[0095] In a specific implementation, the first water shock wave signal may be divided into a plurality of matching signal windows according to the signal length of the first water shock wave signal; wherein each signal window contains a segment of the first water shock wave signal of a corresponding signal length.

[0096] The above-mentioned cepstrum calculation is performed on the multiple signal windows respectively to obtain the time-energy spectra of the water hammer signal cepstrum of the multiple signal windows. In specific implementation, the water hammer wave signal of each signal window is subjected to inverse Fourier transform respectively to obtain the cepstrum response energy of the water hammer signal of the multiple signal windows, and then the time-energy spectra of the transmission signal cepstrum of the multiple signal windows can be constructed.

[0097] Specifically, the cepstrum of the current signal window can be calculated according to the following formula:

[0098]

[0099] Among them, p i (t) represents the cepstrum response energy of the water hammer signal in the current signal window, i is the window number of the current signal window, t is the cepstrum frequency, x i (t) represents the water shock wave signal (a time domain signal) in the current signal window, and t is time.

[0100] When implementing it, taking into account i (t) is the response energy of different cepstrum frequencies and does not correspond to wellbore depth. Signal noise can also obscure the cepstrum response of fractures. To highlight the cepstrum energy response of each fracture cluster at different depths, the corresponding time-energy curve can be obtained by summing the cumulative response energy of the same cepstrum frequency across multiple signal windows. This time-energy curve can then be converted to the corresponding depth-energy curve.

[0101] Specifically, the time-energy curve can be used in combination with the wellbore water hammer velocity to calculate the response depth corresponding to the response time to obtain the corresponding depth-energy curve.

[0102] Specifically, the corresponding depth-energy curve can be obtained according to the following formula:

[0103]

[0104] Where P(D) represents the depth-energy curve, D is the depth, a is the water hammer velocity, and n is the number of signal windows.

[0105] In some embodiments, determining the cepstrum response energy density of each cluster of fractures in the current stimulated well section before temporary plugging based on the depth-energy curve includes: determining the cepstrum response energy density of the current cluster of fractures in the current stimulated well section before temporary plugging according to the following formula:

[0106]

[0107] Among them, P i is the energy density of the cepstrum response before temporary plugging of the current cluster cracks, i is the crack number of the current cluster cracks, D is the depth, P(D) represents the depth-energy curve, d i is the depth corresponding to the maximum value of the energy density of the cepstrum response before the temporary plugging of the current cluster cracks, d a is the effective response distance between the current cluster of cracks and the previous cluster of cracks, d b is the effective response distance between the current cluster of cracks and the next cluster of cracks.

[0108] The effective response distance between the current cluster of cracks and the previous cluster of cracks can be specifically determined based on the spacing between the current cluster of cracks and the previous cluster of cracks (e.g., 1 / 4 of the spacing between the two). Similarly, the effective response distance between the current cluster of cracks and the next cluster of cracks can be determined based on the spacing between the current cluster of cracks and the next cluster of cracks (e.g., 1 / 4 of the spacing between the two).

[0109] In practice, to reduce the impact of noise interference on response intensity calculations and obtain a more accurate cepstrum response energy density for fractures, the cepstrum response energy density of each fracture cluster can be calculated with the depth position of the maximum response energy in the depth-energy curve as the center and 1 / 4 of the distance between the fracture and the adjacent previous and next fractures as the effective range. Accordingly, the cepstrum response energy density of the current fracture cluster before temporary plugging in the current stimulation section can be determined with relatively higher accuracy and relatively smaller error using the following formula:

[0110]

[0111] The fracture cepstral response energy density calculated using the above method is dependent on environmental factors such as noise in the signal acquisition environment and the water hammer pressure wave excitation method. Therefore, it is difficult to ensure that the environmental factors are exactly the same before and after temporary plugging, resulting in the inability to ensure that the energy of the water hammer signal excited by pump shutdown is exactly the same. To make the fracture response energy before and after temporary plugging comparable and reduce the impact of noise on the results, the sum of the cepstral response energy densities of the fractures in the current stimulation section before temporary plugging can be calculated based on the cepstral response energy density of each cluster of fractures in the current stimulation section before temporary plugging. The cepstral response energy ratio of each cluster of fractures in the current stimulation section before temporary plugging can then be determined by calculating the ratio of the cepstral response energy density of each cluster of fractures in the current stimulation section before temporary plugging to the sum of the cepstral response energy densities of the fractures in the current stimulation section before temporary plugging.

[0112] Specifically, the cepstrum response energy ratio of the current cluster fractures in the current stimulation well section before temporary plugging can be determined according to the following formula:

[0113]

[0114] Among them, R i1 is the cepstrum response energy ratio of the current cluster fracture before temporary plugging, and N is the total number of perforation clusters (or the total number of fractures) in the current stimulation well section.

[0115] According to the above method, the cepstral response energy ratio of each fracture cluster in the current well section after temporary plugging can be determined based on the second water hammer signal through cepstral response calculation. The specific implementation process can be found in the above embodiment for calculating the cepstral response energy ratio before temporary plugging and is not further described in this specification.

[0116] In some embodiments, the first type of distribution function for the cepstral response energy ratio of each cluster of fractures in the current well section is constructed based on the cepstral response energy ratio of each cluster of fractures before temporary plugging in the current well section. In specific implementation, for each cluster of fractures, the cepstral response energy ratio of each cluster of fractures before temporary plugging (for example, R i1 ) as the expectation, combined with the distribution characteristics of the normal distribution, the energy ratio of the cepstral response when the fractures are uniformly developed in the well section is used as three times the standard deviation to construct the first-class distribution function f of each cluster of fractures. i (R).

[0117] Specifically, the first-kind distribution function of each cluster of cracks can be constructed according to the following formula:

[0118]

[0119] Among them, f i (R) represents the first type distribution function of the current cluster crack, R is the cepstrum response energy ratio, R stdis the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed, R i1 is the energy ratio of the cepstrum response of the current cluster crack.

[0120] Furthermore, the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed is: Where N is the total number of perforation clusters in the current stimulated well section.

[0121] In some embodiments, determining the temporary plugging efficiency of each cluster of fractures in the current stimulated well section based on the cepstral response energy ratio before temporary plugging, the cepstral response energy ratio after temporary plugging, and the first-class distribution function of each cluster of fractures in the current stimulated well section may include determining the temporary plugging efficiency of the current cluster of fractures in the current stimulated well section according to the following formula:

[0122]

[0123] Among them, E i is the temporary plugging efficiency of the current cluster fracture in the current stimulation section, i is the fracture number of the current cluster fracture, R is the cepstrum response energy ratio, R std is the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed, R i1 is the cepstrum response energy ratio of the current cluster fractures in the current stimulation section before temporary plugging, R i2 is the cepstrum response energy ratio of the current cluster fractures in the current stimulated well section after temporary plugging.

[0124] Based on the above formula, we can know that for a crack before and after temporary plugging |R i1 -R i2 |The larger the value, the i The larger the value, the higher the temporary blocking efficiency of the cluster. However, since the temporary blocking efficiency cannot be increased infinitely, in fact, through long-term experimental observation, similar to the normal distribution, when the response ratio difference before and after temporary blocking reaches a certain level, the temporary blocking efficiency of the cluster can be regarded as reaching its upper limit. i1 -R i2 |>R std When E i Almost 100%.

[0125] It should be noted that E iA larger value only indicates a greater change in the temporary plugging response ratio before and after the temporary plugging of the cluster, but it does not necessarily indicate a better temporary plugging operation. This is because the temporary plugging operation may have further developed the dominant fractures (or dominant clusters) before the temporary plugging, while further blocking the inferior fractures (or inferior clusters) before the temporary plugging. Therefore, in order to more accurately evaluate the temporary plugging operation, it is necessary to further combine the changing trends of the fractures and determine and use the penalty coefficient of the fracture to correct the temporary plugging efficiency of the aforementioned fractures. This will yield a corrected temporary plugging efficiency that accurately reflects the degree of optimization and transformation of the fractures by the temporary plugging operation. The corrected temporary plugging efficiency of each cluster of fractures can then be used to comprehensively evaluate the temporary plugging operation to determine the effectiveness of the temporary plugging operation on the currently transformed well section.

[0126] In some embodiments, see Figure 3 As shown, the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each fracture cluster in the current well section are used to determine the temporary plugging effect of the temporary plugging operation for the current well section. The specific implementation may include the following:

[0127] S1: Determine the corrected temporary plugging efficiency of each fracture cluster in the current stimulation section based on the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each fracture cluster in the current stimulation section; the corrected temporary plugging efficiency is used to characterize the stimulation effect of the temporary plugging operation on each fracture;

[0128] S2: Determine the temporary plugging efficiency of the current stimulated well section based on the corrected temporary plugging efficiency of each cluster of fractures in the current stimulated well section;

[0129] S3: Determine the temporary plugging effect of the temporary plugging operation on the current transformed well section according to the temporary plugging efficiency of the current transformed well section and a preset efficiency threshold parameter.

[0130] The modified temporary plugging efficiency not only reflects the change in the cepstral response capacity of the corresponding fracture after the temporary plugging operation, but also effectively distinguishes the specific optimization type of the fracture after the temporary plugging operation. For example, whether the cepstral response energy ratio of the original dominant fracture increases after temporary plugging, making it more dominant (which can be recorded as optimization type 1), or the cepstral response energy ratio of the original inferior fracture decreases after temporary plugging, making it more inferior (which can be recorded as optimization type 2), or the cepstral response energy ratio of the original dominant fracture decreases after temporary plugging, making its development more balanced (which can be recorded as optimization type 3), or the cepstral response energy ratio of the original inferior fracture increases after temporary plugging (which can be recorded as optimization type 4), etc. Among them, the above-mentioned optimization types 3 and 4 are the goals that the temporary plugging operation hopes to achieve, while optimization types 1 and 2 are the situations that the temporary plugging operation hopes to avoid as much as possible.

[0131] In some embodiments, the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed (for example, R std ) as the expectation, combined with the distribution characteristics of the normal distribution, the energy ratio of the cepstral response when the fractures are uniformly developed in the well section is used as three times the standard deviation to construct the second type of distribution function g(R) for constructing the penalty function.

[0132] Specifically, the second type of distribution function can be expressed as:

[0133] In some embodiments, determining the temporary plugging efficiency penalty coefficient of each cluster of fractures in the current stimulated well section based on the cepstrum response energy ratio before temporary plugging, the cepstrum response energy ratio after temporary plugging, and a preset penalty function may include determining the temporary plugging efficiency penalty coefficient of the current cluster of fractures in the current stimulated well section in the following manner:

[0134]

[0135] Among them, c i The temporary plugging efficiency penalty coefficient of the current cluster fracture in the current transformation well section, i is the fracture number of the current cluster fracture, R is the cepstrum response energy ratio, R std is the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed, R i2 is the cepstrum response energy ratio of the current cluster fractures in the current stimulation section after temporary plugging, R i1 is the cepstrum response energy ratio of the current cluster fractures in the current stimulated well section before temporary plugging.

[0136] In the above formula, the energy ratio of the cepstrum response when the fractures are uniformly developed in the well section is used as the evaluation standard. If R i1 Greater than R std , the cluster of cracks before temporary plugging is considered to be a dominant cluster (or dominant cracks); otherwise, it is considered to be a disadvantageous cluster (or disadvantageous cracks). If the cepstrum response energy ratio of the original dominant cluster decreases after temporary plugging, or the cepstrum response energy ratio of the original disadvantageous cluster increases after temporary plugging, it is considered that the temporary plugging goal has been achieved and a good temporary plugging transformation effect has been obtained.

[0137] Based on the above formula, it can be seen that by analyzing the changing trend of the cepstrum response energy ratio, different optimization transformation types can be distinguished and the corresponding penalty coefficient can be determined. This penalty coefficient can then be used to make targeted corrections to the corresponding cracks, obtaining a corrected temporary plugging efficiency that can more accurately reflect the actual transformation effect of the temporary plugging operation on a single crack.

[0138] In some embodiments, the above method of determining the corrected temporary plugging efficiency of each cluster of fractures in the current reformed well section based on the temporary plugging efficiency and the temporary plugging efficiency penalty coefficient of each cluster of fractures in the current reformed well section may include: calculating the product of the temporary plugging efficiency of each cluster of fractures in the current reformed well section and the corresponding temporary plugging efficiency penalty coefficient to obtain the corrected temporary plugging efficiency of each cluster of fractures in the current reformed well section, which can be expressed as E i ￠=c i E i .

[0139] In some embodiments, the temporary plugging efficiency of the current well section is determined based on the corrected temporary plugging efficiency of each cluster of fractures in the current well section. In specific implementation, the temporary plugging efficiency of the current well section is calculated according to the following formula:

[0140]

[0141] The temporary plugging efficiency of the current well section provides a holistic view of the optimization of the temporary plugging operation within the current well section. Generally, a larger temporary plugging efficiency value indicates a more effective temporary plugging operation for the current well section, resulting in a better temporary plugging effect.

[0142] In some embodiments, the temporary plugging effect of the temporary plugging operation on the current well section is determined based on the temporary plugging efficiency of the current well section and a preset efficiency threshold parameter. The specific implementation may include the following:

[0143] S1: comparing the temporary plugging efficiency of the current well section to a preset first efficiency threshold to obtain a corresponding comparison result;

[0144] S2: When it is determined based on the comparison result that the temporary plugging efficiency of the current transformed well section is less than a preset first efficiency threshold, it is determined that the temporary plugging transformation effect of the temporary plugging operation for the current transformed well section does not meet the requirements.

[0145] The preset efficiency threshold parameters include at least a preset first efficiency threshold, and the preset first efficiency threshold may specifically be 34%.

[0146] In some embodiments, when it is determined that the temporary plugging and transformation effect of the current transformation well section does not meet the requirements, the method may further include the following steps during implementation:

[0147] Adjust the type and amount of temporary plugging agent; and perform temporary plugging operations on the current transformed well section based on the adjusted temporary plugging agent.

[0148] Among them, the types of temporary plugging agents can include at least one of the following: granular temporary plugging agents (for example, quartz sand, expanded clay, etc., which rely on the mutual stacking and interlocking between particles to achieve plugging), fiber-type temporary plugging agents (for example, glass fibers, plant fibers, etc., which can utilize fibers to interweave in cracks to form a network structure to achieve the purpose of plugging), gel-type temporary plugging agents (mostly formed through chemical reactions with a certain strength and viscosity of the gel, filled in cracks or pores for plugging), etc.

[0149] In specific implementation, a preset temporary plugging strategy set can be queried based on the temporary plugging effectiveness of the currently renovated well section to determine a matching target temporary plugging strategy. The preset temporary plugging strategy set includes multiple preset temporary plugging strategies, each corresponding to a specific temporary plugging effectiveness range. This preset temporary plugging strategy set can be constructed through cluster learning using a large number of historical temporary plugging strategies. The type and dosage of the temporary plugging agent are then adjusted based on the target temporary plugging strategy, and temporary plugging operations are performed on the currently renovated well section using the adjusted temporary plugging agent.

[0150] On the contrary, when it is determined that the temporary plugging transformation effect of the current transformation well section meets the requirements, the construction work on the current well section can be ended.

[0151] Furthermore, the preset efficiency threshold parameter may also include a preset second efficiency threshold. When the temporary plugging efficiency of the current well section is determined to be greater than or equal to the first efficiency threshold, the temporary plugging efficiency of the current well section can be further compared with the preset second efficiency threshold. When the temporary plugging efficiency of the current well section is determined to be greater than or equal to the preset second efficiency threshold, the temporary plugging effect is determined to be excellent. Conversely, when the temporary plugging efficiency of the current well section is determined to be less than the preset second efficiency threshold, the temporary plugging effect is determined to be acceptable. This allows for a more refined evaluation of the temporary plugging operation. The preset second efficiency threshold is greater than the preset first efficiency threshold. Specifically, the preset second efficiency threshold may be 68%.

[0152] It should be noted that since both the first and second type distribution functions are constructed based on the normal distribution, the integral value of the standard normal distribution increases rapidly within the range of 0 to 1 times the standard deviation, and then the integral growth rate slows down. At the same time, during the temporary blocking operation, it is easy for the temporary blocking operation to produce an effect, but after a certain effect is produced, the difficulty of improving the temporary blocking efficiency will gradually increase, causing the temporary blocking efficiency growth rate to slow down until it approaches a certain value. Since the integral value of the standard normal distribution within the range of 1 times the standard deviation is 0.68, for the temporary blocking efficiency, we can refer to the data characteristics of the normal distribution and use 68% as the preset second efficiency threshold, and use half of the preset second efficiency threshold (34%) as the preset first efficiency threshold.

[0153] As can be seen from the above, based on the method for determining the temporary plugging effect of hydraulic fracturing provided in the embodiments of this specification, a first water hammer wave signal before the temporary plugging operation and a second water hammer wave signal after the temporary plugging operation can be obtained respectively in the current reformed section of the target well; based on the first water hammer wave signal and the second water hammer wave signal, the cepstrum response energy ratio of each cluster of fractures in the current reformed section before and after the temporary plugging is determined by cepstrum operation and is used, combined with a first type distribution function constructed based on the cepstrum response energy ratio of each cluster of fractures before the temporary plugging, to determine the temporary plugging efficiency of each cluster of fractures that can characterize the degree of change in the cepstrum response ability of the fractures after the temporary plugging operation; at the same time, based on the cepstrum response energy ratio of each cluster of fractures in the current reformed section before and after the temporary plugging, combined with a second type distribution function constructed based on the cepstrum response energy ratio when the fractures in the section are uniformly developed, a temporary plugging efficiency penalty coefficient of each cluster of fractures is determined; and then the temporary plugging efficiency of each cluster of fractures in the current reformed section and the temporary plugging efficiency penalty coefficient are combined to determine the temporary plugging effect of the current reformed section. This enables a more comprehensive and reasonable evaluation of the temporary plugging operation of the transformed well section, and an objective and accurate quantitative determination of the temporary plugging effect of the temporary plugging operation on the transformed well section.

[0154] This specification provides a computer device, referring to Figure 4 The computer device includes a network communication port 401, a processor 402 and a memory 403, and the above structures are connected through internal cables so that each structure can perform specific data interaction.

[0155] The network communication port 401 can be used to obtain a first water hammer wave signal before a temporary plugging operation of the current reformed well section of the target well, and a second water hammer wave signal after the temporary plugging operation.

[0156] The processor 402 can be specifically used to determine the cepstral response energy ratio of each cluster of cracks in the current reformed well section before temporary plugging and the cepstral response energy ratio of each cluster of cracks in the current reformed well section after temporary plugging according to the first water hammer wave signal and the second water hammer wave signal through cepstral response calculation; construct a first type distribution function of the cepstral response energy ratio of each cluster of cracks in the current reformed well section according to the cepstral response energy ratio of each cluster of cracks in the current reformed well section before temporary plugging; determine the cepstral response energy ratio of each cluster of cracks in the current reformed well section according to the cepstral response energy ratio of each cluster of cracks in the current reformed well section before temporary plugging, the cepstral response energy ratio after temporary plugging, and the first type distribution function. Temporary plugging efficiency; wherein, the temporary plugging efficiency is used to characterize the degree of change in the cepstral response energy ratio of the fractures after the temporary plugging operation; according to the cepstral response energy ratio of each cluster of fractures in the current transformed well section before temporary plugging, the cepstral response energy ratio after temporary plugging, and a preset penalty function, the temporary plugging efficiency penalty coefficient of each cluster of fractures in the current transformed well section is determined; wherein, the preset penalty function is constructed based on the second type of distribution function; the second type of distribution function is constructed using the cepstral response energy ratio when the fractures in the well section are uniformly developed; according to the temporary plugging efficiency of each cluster of fractures in the current transformed well section and the temporary plugging efficiency penalty coefficient, the temporary plugging transformation effect of the temporary plugging operation on the current transformed well section is determined.

[0157] The memory 403 may be specifically used to store corresponding instruction programs and related intermediate data.

[0158] Based on the above method, the relevant structural performance of computer equipment can be effectively utilized, the data processing speed of electronic equipment can be improved, and the data processing for determining the temporary plugging transformation effect of hydraulic fracturing can be efficiently realized.

[0159] In this embodiment, the network communication port 401 can be a virtual port that is bound to different communication protocols, thereby being capable of sending or receiving different data. For example, the network communication port can be a port responsible for web data communication, a port responsible for FTP data communication, or a port responsible for email data communication. Furthermore, the network communication port can also be a physical communication interface or communication chip. For example, it can be a wireless mobile network communication chip, such as GSM or CDMA; it can also be a Wi-Fi chip; or it can be a Bluetooth chip.

[0160] In this embodiment, the processor 402 may be implemented in any suitable manner. For example, the processor may take the form of a microprocessor or a processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, a logic gate, a switch, an application-specific integrated circuit (ASIC), a programmable logic controller, an embedded microcontroller, etc. This specification is not intended to limit this.

[0161] In this embodiment, the memory 403 may include multiple levels. In a digital system, anything that can store binary data can be a memory. In an integrated circuit, a circuit with a storage function that has no physical form is also called a memory, such as RAM, FIFO, etc. In a system, a storage device with a physical form is also called a memory, such as a memory stick, TF card, etc.

[0162] The embodiment of the present specification also provides a computer-readable storage medium based on the above-mentioned method for determining the temporary plugging transformation effect of hydraulic fracturing, wherein the computer-readable storage medium stores computer program instructions, which, when executed, realize the following: obtaining a first water hammer wave signal before the temporary plugging operation of the current transformation section of the target well, and a second water hammer wave signal after the temporary plugging operation; determining the cepstral response energy ratio of each cluster of cracks in the current transformation section before temporary plugging and the cepstral response energy ratio of each cluster of cracks in the current transformation section after temporary plugging respectively according to the first water hammer wave signal and the second water hammer wave signal through cepstral response calculation; constructing a first type distribution function of the cepstral response energy ratio of each cluster of cracks in the current transformation section according to the cepstral response energy ratio of each cluster of cracks in the current transformation section before temporary plugging; and calculating the cepstral response energy ratio of each cluster of cracks in the current transformation section according to the cepstral response energy ratio of each cluster of cracks in the current transformation section before temporary plugging. The temporary plugging efficiency of each cluster of fractures in the current transformed well section is determined based on the cepstral response energy ratio before and after temporary plugging of the fractures, and the first type of distribution function; wherein, the temporary plugging efficiency is used to characterize the degree of change in the cepstral response energy ratio of the fractures after the temporary plugging operation; according to the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current transformed well section, and the preset penalty function, the temporary plugging efficiency penalty coefficient of each cluster of fractures in the current transformed well section is determined; wherein, the preset penalty function is constructed based on the second type of distribution function; the second type of distribution function is constructed using the cepstral response energy ratio when the fractures in the well section are uniformly developed; according to the temporary plugging efficiency of each cluster of fractures in the current transformed well section and the temporary plugging efficiency penalty coefficient, the temporary plugging transformation effect of the temporary plugging operation on the current transformed well section is determined.

[0163] In this embodiment, the storage medium includes, but is not limited to, random access memory (RAM), read-only memory (ROM), cache, hard disk drive (HDD), or memory card. The memory can be used to store computer program instructions. The network communication unit can be an interface configured in accordance with the standards specified by the communication protocol for network connection communication.

[0164] In this embodiment, the functions and effects specifically implemented by the program instructions stored in the computer-readable storage medium can be explained in comparison with other implementations and will not be repeated here.

[0165] The present specification also provides a computer program product, which at least includes a computer program. When the computer program is executed by a processor, the following method steps are implemented: obtaining a first water hammer wave signal before the temporary plugging operation of the current reformed well section of the target well, and a second water hammer wave signal after the temporary plugging operation; determining the cepstral response energy ratio of each cluster of fractures in the current reformed well section before the temporary plugging and the cepstral response energy ratio of each cluster of fractures in the current reformed well section after the temporary plugging respectively according to the first water hammer wave signal and the second water hammer wave signal through cepstral response calculation; constructing a first type distribution function of the cepstral response energy ratio of each cluster of fractures in the current reformed well section according to the cepstral response energy ratio of each cluster of fractures in the current reformed well section before the temporary plugging; constructing a first type distribution function of the cepstral response energy ratio of each cluster of fractures in the current reformed well section according to the cepstral response energy ratio of each cluster of fractures in the current reformed well section before the temporary plugging; and determining the cepstral response energy ratio of each cluster of fractures in the current reformed well section according to the cepstral response energy ratio of each cluster of fractures in the current reformed well section before the temporary plugging. For example, the temporary plugging efficiency of each cluster of fractures in the current transformed well section is determined based on the cepstral response energy ratio after temporary plugging, and the first type of distribution function; wherein, the temporary plugging efficiency is used to characterize the degree of change in the cepstral response energy ratio of the fractures after the temporary plugging operation; according to the cepstral response energy ratio of each cluster of fractures in the current transformed well section before temporary plugging, the cepstral response energy ratio after temporary plugging, and a preset penalty function, the temporary plugging efficiency penalty coefficient of each cluster of fractures in the current transformed well section is determined; wherein, the preset penalty function is constructed based on the second type of distribution function; the second type of distribution function is constructed using the cepstral response energy ratio when the fractures in the well section are uniformly developed; according to the temporary plugging efficiency of each cluster of fractures in the current transformed well section and the temporary plugging efficiency penalty coefficient, the temporary plugging transformation effect of the temporary plugging operation on the current transformed well section is determined.

[0166] See Figure 5 As shown, the embodiment of this specification also provides a device for determining the temporary plugging and transformation effect of hydraulic fracturing, which may specifically include the following structural modules:

[0167] The acquisition module 501 may be specifically used to acquire a first water hammer wave signal before a temporary plugging operation of the current reformed well section of the target well, and a second water hammer wave signal after the temporary plugging operation;

[0168] The first determining module 502 may be specifically configured to determine, by cepstrum response calculation based on the first water hammer signal and the second water hammer signal, the cepstrum response energy ratio of each cluster of fractures in the current well section before temporary plugging and the cepstrum response energy ratio of each cluster of fractures in the current well section after temporary plugging;

[0169] The construction module 503 may be specifically configured to construct a first-class distribution function of the cepstrum response energy ratio of each cluster of fractures in the current well section according to the cepstrum response energy ratio of each cluster of fractures in the current well section before temporary plugging;

[0170] The second determination module 504 may be specifically configured to determine the temporary plugging efficiency of each cluster of fractures in the current stimulation well section based on the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current stimulation well section, and the first-class distribution function; wherein the temporary plugging efficiency is used to represent the degree of change in the cepstral response energy ratio of the fractures after the temporary plugging operation;

[0171] The third determination module 505 may be specifically configured to determine a temporary plugging efficiency penalty coefficient for each cluster of fractures in the current stimulated well section based on the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current stimulated well section, and a preset penalty function; wherein the preset penalty function is constructed based on a second type of distribution function; the second type of distribution function is constructed using the cepstral response energy ratio when fractures in the well section are uniformly developed;

[0172] The fourth determining module 506 may be specifically configured to determine the temporary plugging effect of the temporary plugging operation on the current stimulated well section according to the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each fracture cluster in the current stimulated well section.

[0173] In some embodiments, when the fourth determination module 506 is specifically implemented, the temporary plugging effect of the temporary plugging operation on the current modified well section can be determined according to the temporary plugging efficiency of each cluster of fractures in the current modified well section and the temporary plugging efficiency penalty coefficient in the following manner: according to the temporary plugging efficiency of each cluster of fractures in the current modified well section and the temporary plugging efficiency penalty coefficient, the corrected temporary plugging efficiency of each cluster of fractures in the current modified well section is determined; wherein the corrected temporary plugging efficiency is used to characterize the transformation effect of the temporary plugging operation on the fractures; according to the corrected temporary plugging efficiency of each cluster of fractures in the current modified well section, the temporary plugging effectiveness of the current modified well section is determined; according to the temporary plugging effectiveness of the current modified well section and a preset efficiency threshold parameter, the temporary plugging effect of the temporary plugging operation on the current modified well section is determined.

[0174] In some embodiments, when the above-mentioned acquisition module 501 is implemented, the first water hammer wave signal before the temporary plugging operation of the current transformed well section of the target well and the second water hammer wave signal after the temporary plugging operation can be obtained in the following manner: stop the pumping component to excite and form the first water hammer wave in the target well; and collect the water hammer wave signal of the current transformed well section of the target well through the sensor as the first water hammer wave signal; perform a temporary plugging operation on the current transformed well section; when the temporary plugging operation is completed, stop the pumping component to excite and form the second water hammer wave in the target well; and collect the water hammer wave signal of the current transformed well section of the target well through the sensor as the second water hammer wave signal.

[0175] In some embodiments, when the first determination module 502 is specifically implemented, the cepstrum response energy ratio of each cluster of fractures in the current reformed well section before temporary plugging can be determined based on the first water hammer wave signal through cepstrum response calculation in the following manner: dividing the first water hammer wave signal into multiple signal windows; and performing cepstrum calculation on the multiple signal windows respectively to obtain time-energy spectra of the water hammer signal cepstrum of the multiple signal windows; according to the time-energy spectra of the water hammer signal cepstrum of the multiple signal windows, by calculating the cumulative response energy of the same cepstrum of the multiple signal windows, a corresponding time-energy curve is obtained; according to the water hammer wave velocity, the time-energy curve is converted into a corresponding depth-energy curve; according to the depth-energy curve, the cepstrum response energy density of each cluster of fractures in the current reformed well section before temporary plugging is determined; according to the cepstrum response energy density of each cluster of fractures in the current reformed well section before temporary plugging, the cepstrum response energy ratio of each cluster of fractures in the current reformed well section before temporary plugging is calculated.

[0176] In some embodiments, when the first determining module 502 is specifically implemented, the cepstrum response energy density of the current cluster of fractures in the current stimulated well section before temporary plugging can be determined according to the following formula:

[0177]

[0178] Among them, P i is the energy density of the cepstrum response before temporary plugging of the current cluster cracks, i is the crack number of the current cluster cracks, D is the depth, P(D) represents the depth-energy curve, d i is the depth corresponding to the maximum value of the energy density of the cepstrum response before the temporary plugging of the current cluster cracks, d a is the distance between the current cluster of cracks and the previous cluster of cracks, d b is the distance between the current cluster of cracks and the next cluster of cracks.

[0179] In some embodiments, when the second determining module 504 is specifically implemented, the temporary plugging efficiency of the current cluster of fractures in the current stimulated well section can be determined according to the following formula:

[0180]

[0181] Among them, E i is the temporary plugging efficiency of the current cluster fracture in the current stimulation section, i is the fracture number of the current cluster fracture, R is the cepstrum response energy ratio, R std is the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed, R i1 is the cepstrum response energy ratio of the current cluster fractures in the current stimulation section before temporary plugging, R i2 is the cepstrum response energy ratio of the current cluster fractures in the current stimulated well section after temporary plugging.

[0182] In some embodiments, when the third determining module 505 is specifically implemented, the temporary plugging efficiency penalty coefficient of the current cluster of fractures in the current stimulation well section can be determined in the following manner:

[0183]

[0184] Among them, c i The temporary plugging efficiency penalty coefficient of the current cluster fracture in the current transformation well section, i is the fracture number of the current cluster fracture, R is the cepstrum response energy ratio, R std is the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed, R i1 is the cepstrum response energy ratio of the current cluster fractures in the current stimulation section before temporary plugging, R i2 is the cepstrum response energy ratio of the current cluster fractures in the current stimulated well section after temporary plugging.

[0185] In some embodiments, when the fourth determination module 506 is specifically implemented, the temporary plugging transformation effect of the temporary plugging operation on the current modified well section can be determined according to the temporary plugging efficiency of the current modified well section and the preset efficiency threshold parameter in the following manner: compare the temporary plugging efficiency of the current modified well section with the preset first efficiency threshold to obtain a corresponding comparison result; according to the comparison result, when it is determined that the temporary plugging efficiency of the current modified well section is less than the preset first efficiency threshold, it is determined that the temporary plugging transformation effect of the temporary plugging operation on the current modified well section does not meet the requirements.

[0186] It should be noted that the units, devices or modules described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. For the convenience of description, the above devices are described in terms of functions and are divided into various modules and described separately. Of course, when implementing this specification, the functions of each module can be implemented in the same or multiple software and / or hardware, or the module that implements the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0187] As can be seen from the above, the device for determining the temporary plugging effect of hydraulic fracturing provided in the embodiments of this specification can more comprehensively and reasonably evaluate the temporary plugging operation of the transformed well section and accurately determine the temporary plugging effect of the temporary plugging operation on the transformed well section.

[0188] In a specific scenario example, the method for determining the temporary plugging effect of hydraulic fracturing can be used to evaluate the temporary plugging effect based on high-frequency water hammer pressure wave signals. Figure 6 As shown in FIG, high-frequency water hammer pressure monitoring is carried out for a carbonate condensate gas horizontal well (eg, a target well) in a certain location.

[0189] In this scenario, to address the problems with existing methods and their root causes, a temporary plugging effectiveness evaluation method (WHBEM) based on the water hammer cepstrum response and considering the water hammer response of each fracture cluster is proposed based on the high-frequency water hammer pressure signal at the wellhead before and after temporary plugging. First, the water hammer response energy density of each fracture cluster in the wellbore before and after temporary plugging is calculated using a signal cepstrum algorithm, and the corresponding fracture response energy ratio is further calculated (for example, the cepstrum response energy ratio of each fracture cluster in the current stimulation section before temporary plugging, and the cepstrum response energy ratio of each fracture cluster in the current stimulation section after temporary plugging). Second, a temporary plugging efficiency calculation method based on the change in the fracture water hammer response energy ratio before and after temporary plugging is used to quantify the degree of change in the response ratio of each cluster after temporary plugging (for example, the temporary plugging efficiency of each fracture cluster in the current stimulation section). At the same time, a temporary plugging efficiency penalty function based on the energy ratio change trend is designed to correct the temporary plugging efficiency of each cluster of fractures in the stimulation section (obtaining the corrected temporary plugging efficiency). The average temporary plugging efficiency of each cluster is used as the temporary plugging effectiveness of the stimulation section (for example, the temporary plugging effectiveness of the current stimulation well section). Corresponding temporary plugging effect evaluation criteria are also given.

[0190] For specific implementation, please refer to Figure 6 As shown, the following steps are included.

[0191] The fracture cepstrum response intensity ratio calculation method based on water hammer signals is as follows: First, the water hammer wave signal (including the first water hammer wave signal before temporary plugging and the second water hammer wave signal after temporary plugging) is decomposed into several window signal windows according to a certain signal length. The cepstrum calculation is performed on each signal window to obtain the time-energy spectrum of the water hammer signal cepstrum. Secondly, the cumulative response energy of the same cepstrum frequency in all cepstrum windows is calculated to obtain a time-energy curve. The response depth corresponding to the response time is calculated based on the water hammer wave velocity to obtain a depth-energy curve. Thirdly, based on the depth-energy curve, the response energy density corresponding to each cluster of fractures is calculated within a certain depth range around each cluster of fractures, with the depth at which each cluster of fractures has the maximum response energy as the center. Finally, the response energy density of all fractures in the stimulation section is summed, and the proportion of the response energy density of each cluster of fractures is calculated (for example, the cepstrum response energy ratio of each cluster of fractures in the current stimulation section before temporary plugging and the cepstrum response energy ratio of each cluster of fractures in the current stimulation section after temporary plugging are determined). The specific calculation process can be referred to the following formula.

[0192]

[0193] Based on the calculation method of temporary plugging efficiency of cracks, first, for the temporary plugging efficiency of the i-th liquid inflow cluster (for example, the current cluster cracks) in the construction section, the response ratio R before temporary plugging of the cluster is calculated. i1 (For example, the cepstrum response energy ratio of the current cluster crack before temporary plugging) is the expected energy response ratio R when each cluster develops uniformly std (For example, the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed) is 3 times the standard deviation, and the normal distribution function f is constructed. i (x) (for example, the first type of distribution function); secondly, according to the cepstrum energy response ratio R before and after the temporary blockage of the i-th cluster i1 and R i2 (For example, the cepstrum response energy ratio of the current cluster crack after temporary plugging), calculate the temporary plugging efficiency E of the inflow cluster i i (For example, the temporary plugging efficiency of the current cluster fractures in the current stimulated well section).

[0194] The specific calculation process can be found in the following formula.

[0195]

[0196]

[0197] Based on the calculation method of the correction coefficient of temporary plugging efficiency of cracks, first, for the temporary plugging efficiency of the i-th liquid inflow cluster in the construction section, the energy response ratio R when the clusters in the transformation section are uniformly developed is used.std Construct a normal distribution function g with the expected value and 3 times the standard deviation i (x) (for example, the second type of distribution function); secondly, according to the cepstrum energy response ratio R before and after the temporary blockage of the i-th cluster i1 and R i2 The relative size of R std According to the change of the temporary blocking efficiency penalty coefficient c of the inlet cluster i, i (For example, the temporary plugging efficiency penalty coefficient of the current cluster crack.) The specific calculation process can be found in the following formula.

[0198]

[0199] Based on the calculation and evaluation method of the temporary blocking operation efficiency, first, the temporary blocking efficiency E i and correction factor c i Multiply to get the corrected temporary blocking efficiency of each cluster, and calculate the average value of the corrected temporary blocking efficiency of each cluster As the temporary plugging efficiency of the transformation section; determine the temporary plugging effect evaluation threshold according to the temporary plugging operation project requirements. The temporary plugging effectiveness evaluation result (for example, the temporary plugging efficiency of the current well section) is compared with the threshold value to obtain the temporary plugging effectiveness evaluation result. For details, please refer to the following formula.

[0200]

[0201] To further validate the reliability of this method, a carbonate condensate gas well in a specific location was used as a case study. The temporary plugging effectiveness of nine sections was calculated and compared with the Erf function and the temporary plugging pressure increase results. The well was completed using bridge plug perforation and had 15 sections, of which high-frequency water hammer pressure monitoring was performed on nine of them.

[0202] Specifically, taking the 11th section of the case well as an example, first the cepstrum is used to calculate the response of each cluster of fractures. The high-frequency pressure acquisition equipment acquires the high-frequency water hammer pressure curve before and after temporary plugging, which can be referred to Figure 7 shown.

[0203] It can be calculated based on the corresponding formula (1) Figure 7 The cepstrum response of the water hammer pressure signal is shown in Figure 8 As shown in a and b, the horizontal axis is the signal monitoring time, and the vertical axis is the cepstrum response time. The dark area represents the response of the crack, and the darker the color, the stronger the crack response.

[0204] The depth-energy curve of the water hammer signal before and after temporary plugging can be further calculated by combining the water hammer wave velocity. In order to more intuitively compare the changes in the response intensity of each cluster before and after temporary plugging, the curve is normalized to obtain the depth-response energy curve of the segment, as shown in the figure. Figure 9 The curves are normalized to more intuitively compare the changes in the response strength of each cluster before and after temporary plugging. The bottom of the figure shows the wellbore structure for this section of the horizontal well. The black triangles represent the locations of the perforation clusters, and the blue squares represent the locations of the bridge plugs. It can be seen that before temporary plugging, the strongest cepstrum response was in Cluster 3. However, after temporary plugging, the response of Cluster 3 weakened, and the strongest response was in Cluster 4. While the temporary plugging operation has altered the response of the downhole fractures, its effectiveness remains uncertain.

[0205] To calculate the energy response density for each fracture cluster, we used the depth of each fracture cluster's maximum response energy as the center and calculated it within a range of half the perforation spacing surrounding each fracture cluster. Simultaneously, we summed the response energy densities of all fractures within the stimulated section and calculated the proportion of each fracture cluster's response energy density. This is shown in Table 1.

[0206] Table 1

[0207]

[0208] Based on the number of perforation clusters and the response ratio before temporary plugging, a normal distribution function (e.g., the first-class distribution function) is constructed according to the temporary plugging efficiency calculation formula to calculate the temporary plugging efficiency of each cluster of fractures. Then, the temporary plugging efficiency of each cluster of fractures is calculated based on the response ratio before and after temporary plugging of each cluster of fractures. For details, please refer to Figure 10 and the contents shown in Table 2.

[0209] Table 2

[0210]

[0211] Based on the number of perforation clusters, a normal distribution function (e.g., a second-order distribution function) is constructed to calculate the penalty coefficient of each cluster's fracture temporary plugging efficiency. Then, the penalty coefficient of each cluster's fracture temporary plugging efficiency is calculated based on the response ratio before and after each cluster's fracture temporary plugging. For details, please refer to Figure 11 and the contents shown in Table 3.

[0212] Table 3

[0213]

[0214] Based on the calculated temporary plugging efficiency and penalty coefficient, the temporary plugging effectiveness for this section is calculated as 1 / 4 × (85% × 0.81 + 28% × 0.72 + 85% × 1 + 100% × 1) = 68.5%. Here, the integral value of 68% within the expected range of one standard deviation of the normal distribution is used as the criterion for effective temporary plugging. Half of this, 34%, is used as the good standard. Therefore, the temporary plugging effect of this modified section is evaluated as excellent. The criteria here are not required to be the same as those in the case study and can be modified.

[0215] The above scenario examples validate the methods provided in this manual for determining the effectiveness of temporary plugging in hydraulic fracturing, including: a method for calculating the ratio of fracture cepstrum response intensity; a method for calculating fracture temporary plugging efficiency; a method for calculating the correction coefficient for fracture temporary plugging efficiency; and a method for calculating and evaluating the effectiveness of temporary plugging operations. These methods can be used to quantitatively calculate and evaluate the effectiveness of temporary plugging operations in hydraulic fracturing projects, providing a basis for evaluating the effectiveness of on-site temporary plugging operation designs and a verification method for optimizing temporary plugging operation scheme designs.

[0216] Although this specification provides the method operation steps as described in the embodiments or flow charts, more or fewer operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the device or client product in practice is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, a parallel processor or a multi-threaded processing environment, or even a distributed data processing environment). The term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or device including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, product or device. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or device including the elements. Words such as first and second are used to represent names and do not represent any particular order.

[0217] Those skilled in the art will also appreciate that, in addition to implementing the controller in pure computer-readable program code, it is entirely possible to implement the same functionality by logically programming the method steps in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, embedded microcontrollers, and the like. Therefore, such a controller can be considered a hardware component, and the devices included therein for implementing various functions can also be considered structures within the hardware component. Alternatively, the devices for implementing various functions can be considered both software modules implementing the method and structures within the hardware component.

[0218] This specification may be described in the general context of computer-executable instructions, such as program modules, executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, classes, and the like that perform specific tasks or implement specific abstract data types. This specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communications network. In a distributed computing environment, program modules may be located in local and remote computer-readable storage media, including storage devices.

[0219] Through the description of the above embodiments, it can be seen that those skilled in the art can clearly understand that this specification can be implemented by means of software plus the necessary general hardware platform. Based on this understanding, the technical solution of this specification can essentially be embodied in the form of a software product. This computer software product can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a mobile terminal, a server, or a network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments of this specification.

[0220] The various embodiments in this specification are described in a progressive manner. References to the common or similar parts of the various embodiments are sufficient. Each embodiment focuses on the differences from the other embodiments. This specification can be used in a variety of general-purpose or specialized computer system environments or configurations. For example, personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, and distributed computing environments that include any of the above systems or devices.

[0221] Although the present specification has been described through embodiments, those skilled in the art will appreciate that there are many modifications and variations to the present specification without departing from the spirit of the present specification. It is intended that the appended claims include these modifications and variations without departing from the spirit of the present specification.

Claims

1. A method for determining the temporary plugging effect of hydraulic fracturing, characterized in that: include: Obtaining a first water hammer wave signal before temporary plugging operation of the current reformed well section of the target well, and a second water hammer wave signal after the temporary plugging operation; According to the first water hammer wave signal and the second water hammer wave signal, the cepstrum response energy ratio of each cluster of fractures in the current well section before temporary plugging and the cepstrum response energy ratio of each cluster of fractures in the current well section after temporary plugging are determined by cepstrum response calculation; According to the cepstrum response energy ratio of each cluster of fractures in the current well section before temporary plugging, a first-class distribution function of the cepstrum response energy ratio of each cluster of fractures in the current well section is constructed; The temporary plugging efficiency of each cluster of fractures in the current stimulation section is determined based on the cepstral response energy ratio before and after temporary plugging, as well as the first-class distribution function. The temporary plugging efficiency is used to characterize the degree of change in the cepstral response energy ratio of the fractures after the temporary plugging operation. A temporary plugging efficiency penalty coefficient for each cluster of fractures in the current stimulated well section is determined based on the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current stimulated well section, as well as a preset penalty function. The preset penalty function is constructed based on a second-class distribution function; the second-class distribution function is constructed using the cepstral response energy ratio when fractures in the well section are uniformly developed. The temporary plugging effect of the temporary plugging operation on the current well section is determined based on the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each cluster of fractures in the current well section.

2. The method according to claim 1, characterized in that Based on the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each cluster of fractures in the current stimulation section, the temporary plugging effect of the temporary plugging operation for the current stimulation section is determined, including: Based on the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each cluster of fractures in the current stimulation section, the corrected temporary plugging efficiency of each cluster of fractures in the current stimulation section is determined. The corrected temporary plugging efficiency is used to characterize the stimulation effect of the temporary plugging operation on the fractures. According to the corrected temporary plugging efficiency of each cluster of fractures in the current well section, the temporary plugging efficiency of the current well section is determined; The temporary plugging transformation effect of the temporary plugging operation for the current transformed well section is determined based on the temporary plugging efficiency of the current transformed well section and the preset efficiency threshold parameter.

3. The method according to claim 1, characterized in that Obtain the first water hammer wave signal before the temporary plugging operation of the current reformed section of the target well, and the second water hammer wave signal after the temporary plugging operation, including: Stopping the pumping assembly to stimulate a first water hammer wave in the target well; and collecting a water hammer wave signal of a current reformed well section of the target well through a sensor as the first water hammer wave signal; Perform temporary plugging operations on the currently transformed well section; When the temporary plugging operation is completed, the pumping assembly is stopped to stimulate a second water hammer wave in the target well; and a water hammer wave signal of the current reformed well section of the target well is collected by a sensor as the second water hammer wave signal.

4. The method according to claim 1, wherein According to the first water hammer wave signal and the second water hammer wave signal, the cepstrum response energy ratio of each cluster of fractures in the current stimulation well section before temporary plugging and the cepstrum response energy ratio of each cluster of fractures in the current stimulation well section after temporary plugging are determined respectively through cepstrum response calculation, including: The cepstrum response energy ratio of each cluster of fractures in the current stimulation section before temporary plugging is determined based on the first water hammer wave signal through cepstrum response calculation in the following manner: Dividing the first water hammer wave signal into a plurality of signal windows; and performing cepstrum calculation on the plurality of signal windows respectively to obtain time-energy spectra of the water hammer signal cepstrum of the plurality of signal windows; According to the time-energy spectra of the water hammer signal cepstrum of multiple signal windows, the corresponding time-energy curve is obtained by calculating the cumulative response energy of the same cepstrum of multiple signal windows; According to the water hammer wave velocity, the time-energy curve is converted into the corresponding depth-energy curve; According to the depth-energy curve, the cepstrum response energy density of each cluster of fractures in the current stimulation section before temporary plugging is determined; According to the cepstrum response energy density of each cluster of fractures in the current stimulation well section before temporary plugging, the cepstrum response energy ratio of each cluster of fractures in the current stimulation well section before temporary plugging is calculated.

5. The method according to claim 4, characterized in that Based on the depth-energy curve, the cepstrum response energy density of each cluster of fractures in the current stimulation section before temporary plugging is determined, including: The cepstrum response energy density of the current cluster fractures in the current stimulation section before temporary plugging is determined according to the following formula: Among them, P i is the energy density of the cepstrum response before temporary plugging of the current cluster cracks, i is the crack number of the current cluster cracks, D is the depth, P(D) represents the depth-energy curve, d i is the depth corresponding to the maximum value of the energy density of the cepstrum response before the temporary plugging of the current cluster cracks, d a is the effective response distance between the current cluster of cracks and the previous cluster of cracks, d b is the effective response distance between the current cluster of cracks and the next cluster of cracks.

6. The method according to claim 1, characterized in that The temporary plugging efficiency of each cluster of fractures in the current stimulation section is determined based on the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current stimulation section, as well as the first-class distribution function, including: The temporary plugging efficiency of the current cluster fractures in the current stimulation well section is determined according to the following formula: Among them, E i is the temporary plugging efficiency of the current cluster fracture in the current stimulation section, i is the fracture number of the current cluster fracture, R is the cepstrum response energy ratio, R std is the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed, R i1 is the cepstrum response energy ratio of the current cluster fractures in the current stimulation section before temporary plugging, R i2 is the cepstrum response energy ratio of the current cluster fractures in the current stimulated well section after temporary plugging.

7. The method according to claim 1, characterized in that Based on the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current stimulation well section, and a preset penalty function, the temporary plugging efficiency penalty coefficient of each cluster of fractures in the current stimulation well section is determined, including: The temporary plugging efficiency penalty coefficient of the current cluster fracture in the current stimulation well section is determined as follows: Among them, c i is the temporary plugging efficiency penalty coefficient of the current cluster fracture in the current transformation well section, i is the fracture number of the current cluster fracture, R is the cepstrum response energy ratio, R std is the energy ratio of the cepstrum response when the fractures in the well section are uniformly developed, R i1 is the cepstrum response energy ratio of the current cluster fractures in the current stimulation section before temporary plugging, R i2 is the cepstrum response energy ratio of the current cluster fractures in the current stimulated well section after temporary plugging.

8. The method according to claim 2, characterized in that Based on the temporary plugging efficiency of the current well section and the preset efficiency threshold parameters, the temporary plugging effect of the temporary plugging operation for the current well section is determined, including: Comparing the temporary plugging efficiency of the current reformed well section with a preset first efficiency threshold to obtain a corresponding comparison result; According to the comparison result, when it is determined that the temporary plugging efficiency of the current transformed well section is less than a preset first efficiency threshold, it is determined that the temporary plugging transformation effect of the temporary plugging operation for the current transformed well section does not meet the requirements.

9. A device for determining the temporary plugging effect of hydraulic fracturing, characterized in that: include: An acquisition module is used to acquire a first water hammer wave signal before a temporary plugging operation of the current reformed well section of the target well, and a second water hammer wave signal after the temporary plugging operation; A first determination module is configured to determine, based on the first water hammer wave signal and the second water hammer wave signal, a cepstrum response energy ratio of each cluster of fractures in the current reformed well section before temporary plugging and a cepstrum response energy ratio of each cluster of fractures in the current reformed well section after temporary plugging by performing a cepstrum response calculation; A construction module is used to construct a first-class distribution function of the cepstrum response energy ratio of each cluster of fractures in the current well section according to the cepstrum response energy ratio of each cluster of fractures in the current well section before temporary plugging; The second determination module is configured to determine the temporary plugging efficiency of each cluster of fractures in the current stimulation well section based on the cepstral response energy ratio of each cluster of fractures before and after temporary plugging, and the first-class distribution function. The temporary plugging efficiency is used to represent the degree of change in the cepstral response energy ratio of the fractures after the temporary plugging operation. The third determination module is configured to determine a temporary plugging efficiency penalty coefficient for each cluster of fractures in the current stimulated well section based on the cepstral response energy ratio before and after temporary plugging of each cluster of fractures in the current stimulated well section, and a preset penalty function; wherein the preset penalty function is constructed based on a second-type distribution function; the second-type distribution function is constructed using the cepstral response energy ratio when fractures in the well section are uniformly developed; The fourth determination module is used to determine the temporary plugging effect of the temporary plugging operation on the current well section according to the temporary plugging efficiency and temporary plugging efficiency penalty coefficient of each cluster of fractures in the current well section.

10. A computer device, characterized in that: The method comprises a processor and a memory for storing processor-executable instructions, wherein the processor implements the steps of the method according to any one of claims 1 to 8 when executing the instructions.

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