Fracturing transformation effect analysis method and device

Abstract

The invention discloses a fracturing transformation effect analysis method and device. The method comprises the steps that a wellhead pressure curve obtained after fracturing transformation is conducted on a shale gas well is obtained; according to the wellhead pressure curve, the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections are determined; projecting the pressure fluctuation frequencies and the pressure fluctuation amplitudes of the plurality of fracturing sections to a preset evaluation chart; according to projection results of the pressure fluctuation frequencies and the pressure fluctuation amplitudes of the plurality of fracturing sections on the evaluation chart, determining fracturing transformation effects of the plurality of fracturing sections; the fracturing transformation effect reflects the complexity of a fracture network formed by fracturing transformation, a fracturing transformation effect analysis technical scheme which is simple in operation process, low in cost and high in timeliness can be provided, the analysis accuracy is improved, and the requirement for accurately and rapidly evaluating the fracturing transformation effect on an oil field site is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fracturing process, in particular to a fracturing reconstruction effect analysis method and device. BACKGROUND

[0002] This section is intended to provide background or context to the embodiments of the application. The description herein does not constitute admission that the information provided herein is prior art.

[0003] For shale oil and gas, a kind of unconventional "man-made oil and gas reservoir", the good or bad of fracturing reconstruction effect directly determines the level of gas well production. The analysis methods of fracturing reconstruction effect mainly include: ① construction monitoring method, mainly including microseismic method, tracer method, imaging method, etc. This kind of method is complex in operation, high in cost, and the resolution decreases with the deepening of reservoir depth; ② numerical simulation method, mainly including unstable well testing method, G function analysis method, net pressure fitting method, etc. This kind of method is complicated in evaluation process, complex in calculation, difficult to accurately determine parameters, and lacks timeliness; ③ experimental method, mainly including CT scanning method, acoustic emission method, proppant monitoring method, etc. This kind of method is mainly qualitative- semi quantitative evaluation, needs to drill core, and has poor experimental convenience, long cycle, low efficiency and high cost.

[0004] In summary, the current fracturing reconstruction effect analysis method generally has the characteristics of complex operation, complicated process, high cost and poor timeliness, which cannot meet the needs of accurate and rapid evaluation of fracturing reconstruction effect in oilfield site. SUMMARY

[0005] The embodiments of the present application provide a fracturing reconstruction effect analysis method to provide a fracturing reconstruction effect analysis technical scheme with simple operation process, low cost and high timeliness, improve the analysis accuracy, meet the needs of accurate and rapid evaluation of fracturing reconstruction effect in oilfield site, and the method comprises:

[0006] Obtain the wellhead pressure curve after fracturing reconstruction of shale gas well;

[0007] According to the wellhead pressure curve, the pressure fluctuation frequency and the pressure fluctuation amplitude of the plurality of fracturing segments are determined; the pressure fluctuation frequency is the fluctuation frequency of the wellhead pressure data within a preset time length; the pressure fluctuation amplitude is the difference between the maximum value and the minimum value of the wellhead pressure data of the plurality of fracturing segments;

[0008] Project the pressure fluctuation frequency and the pressure fluctuation amplitude of the plurality of fracturing segments onto a preset evaluation chart; the evaluation chart is divided into four quadrants by the abscissa and the ordinate; the abscissa is the pressure fluctuation frequency; the ordinate is the pressure fluctuation amplitude;

[0009] The fracturing reconstruction effect of the multiple fracturing sections is determined according to the projection result of the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections on the evaluation chart.

[0010] The embodiment of the present application also provides a fracturing reconstruction effect analysis device, which is used for providing a simple operation process, low cost, high timeliness and high analysis accuracy fracturing reconstruction effect analysis technical scheme, and meets the requirement of accurate and rapid evaluation of the fracturing reconstruction effect in the oilfield site.

[0011] The acquisition module is used for acquiring the wellhead pressure curve after the shale gas well is fractured and reconstructed.

[0012] The frequency and amplitude determination module is used for determining the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections according to the wellhead pressure curve; the pressure fluctuation frequency is the fluctuation times of the wellhead pressure data within a preset time length; and the pressure fluctuation amplitude is the difference between the maximum value and the minimum value of the wellhead pressure data of the multiple fracturing sections.

[0013] The projection module is used for projecting the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections on the preset evaluation chart; the evaluation chart is divided into four quadrants by the horizontal coordinate and the vertical coordinate; the horizontal coordinate is the pressure fluctuation frequency; and the vertical coordinate is the pressure fluctuation amplitude.

[0014] The fracturing reconstruction effect determination module is used for determining the fracturing reconstruction effect of the multiple fracturing sections according to the projection result of the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections on the evaluation chart; and the fracturing reconstruction effect reflects the complexity of the fracture network formed by the fracturing reconstruction.

[0015] Compared with the analysis technical scheme of the fracturing reconstruction effect in the prior art, the embodiment of the present application acquires the wellhead pressure curve after the shale gas well is fractured and reconstructed, determines the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections according to the wellhead pressure curve, projects the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections on the preset evaluation chart, and determines the fracturing reconstruction effect of the multiple fracturing sections according to the projection result of the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections on the evaluation chart, so that a simple operation process, low cost, high timeliness and high analysis accuracy fracturing reconstruction effect analysis technical scheme is provided, the analysis accuracy is improved, and the requirement of accurate and rapid evaluation of the fracturing reconstruction effect in the oilfield site is met. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. In the drawings:

[0017] Figure 1 The flow chart of the fracturing reconstruction effect analysis method provided in the embodiments of the present application;

[0018] Figure 2 The flow chart of the specific example of the fracturing reconstruction effect analysis method provided in the embodiments of the present application;

[0019] Figure 3 The calculation result chart of the pressure fluctuation frequency and the pressure fluctuation amplitude provided in the embodiments of the present application;

[0020] Figure 4 The schematic diagram of the evaluation chart provided in the embodiments of the present application;

[0021] Figure 5 The result schematic diagram of the fracturing reconstruction effect analysis of a certain shale gas well provided in the embodiments of the present application;

[0022] Figure 6 The schematic diagram of the fracturing reconstruction effect analysis device provided in the embodiments of the present application;

[0023] Figure 7 The schematic diagram of the computer device provided in the embodiments of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will further describe the embodiments of the present application in combination with the drawings. Herein, the schematic embodiments of the present application and the descriptions thereof are used to explain the present application, but not as a limitation to the present application.

[0025] The acquisition, storage, use, processing and the like of data in the technical solutions of the present application all comply with the relevant provisions of the national laws and regulations.

[0026] The term "and / or" in the present application is only used to describe an association relationship, which means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. In addition, the term "at least one" in the present application means any one of multiple or any combination of at least two of multiple, for example, including at least one of A, B and C can mean including any one or more elements selected from the set consisting of A, B and C.

[0027] In the description of the present specification, "include", "includes" and "including", "have", "has", "having" or the like are open terms, that is, mean including but not limited to. The description referring to the terms "one embodiment", "one specific embodiment", "some embodiments", "for example" and the like means that the specific features, structures or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. The order of steps involved in each embodiment is used for illustrative description of the implementation of the present application, and the order of steps is not limited, and can be appropriately adjusted as needed.

[0028] To solve the problem of "complex operation, tedious process, high cost, poor timeliness, and unable to meet the needs of accurate and rapid evaluation of fracturing effect in oilfield field" encountered in the process of fracturing reconstruction effect analysis, the present embodiment analyzes the pressure fluctuation frequency and pressure fluctuation amplitude according to the fracturing construction curve data, and establishes a fracturing fracture network complexity four-quadrant evaluation chart. The method can quickly and accurately evaluate the fracturing reconstruction effect, and meet the needs of fracturing effect evaluation in oilfield field.

[0029] Figure 1 The flowchart of the fracturing reconstruction effect analysis method provided in the present embodiment is shown in Figure 1 The method can include:

[0030] Step 101, obtaining the wellhead pressure curve after the shale gas well is fractured and reconstructed;

[0031] Step 102, determining the pressure fluctuation frequency and pressure fluctuation amplitude of a plurality of fracturing sections according to the wellhead pressure curve; the pressure fluctuation frequency is the fluctuation times of the wellhead pressure data within a preset time length; the pressure fluctuation amplitude is the difference between the maximum and minimum values of the wellhead pressure data of the plurality of fracturing sections;

[0032] Step 103, projecting the pressure fluctuation frequency and pressure fluctuation amplitude of the plurality of fracturing sections onto a preset evaluation chart; the evaluation chart is divided into four quadrants by the abscissa and the ordinate; the abscissa is the pressure fluctuation frequency; the ordinate is the pressure fluctuation amplitude;

[0033] Step 104, determining the fracturing reconstruction effect of the plurality of fracturing sections according to the projection result of the pressure fluctuation frequency and pressure fluctuation amplitude of the plurality of fracturing sections on the evaluation chart; the fracturing reconstruction effect reflects the complexity of the fracture network formed by the fracturing reconstruction.

[0034] The fracturing reconstruction effect analysis method provided by the embodiment of the present application can realize a fracturing reconstruction effect analysis technical solution with simple operation process, low cost and high timeliness, improve analysis accuracy, and meet the needs of oil field site for accurately and quickly evaluating fracturing reconstruction effect.

[0035] Figure 2 A flow chart of a specific example of the fracturing reconstruction effect analysis method provided in the embodiment of the present application is shown in FIG. 1. Figure 2 The fracturing reconstruction effect analysis process can be as follows.

[0036] The first step is to determine the wellhead pressure curve, which can be determined based on the construction report in the fracturing reconstruction process to preliminarily determine the shape characteristics of the wellhead pressure curve and provide data support for subsequent analysis of pressure fluctuation frequency and pressure fluctuation amplitude. According to the actual measured wellhead pressure data, the calculation can also avoid the uncertainty of multiple parameter selection.

[0037] The second step is to calculate the pressure fluctuation frequency of multiple fracturing sections, which can be calculated according to the wellhead pressure curve. The number of wellhead pressure data fluctuations (sine wave) within a preset time length is the pressure fluctuation frequency.

[0038] The third step is to calculate the pressure fluctuation amplitude of multiple fracturing sections, which can be calculated according to the wellhead pressure curve, that is, the difference between the maximum value and the minimum value of the wellhead pressure data.

[0039] In one embodiment, according to the wellhead pressure curve, the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections can include: uniformly processing the wellhead pressure data of each fracturing section in the wellhead pressure curve; determining the arithmetic mean of the uniformly processed wellhead pressure data; determining the maximum value of the difference between the uniformly processed wellhead pressure data and the arithmetic mean within a preset time window; and determining the number of maximum values as the pressure fluctuation frequency of the fracturing section.

[0040] In this embodiment, according to the wellhead pressure curve, the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections can include:

[0041] The wellhead pressure data of each fracturing section in the wellhead pressure curve is uniformly processed according to the following formula:

[0042]

[0043] Wherein, P i is the wellhead pressure data of the i-th fracturing section; VP i is the uniformly processed wellhead pressure data; P max is the maximum value of the wellhead pressure data of the multiple fracturing sections; Pmin a minimum value of wellhead pressure data of the multiple fracturing sections;

[0044] The arithmetic mean of the normalized wellhead pressure data is determined according to the following formula:

[0045]

[0046] wherein, is the arithmetic mean of the normalized wellhead pressure data; n is the number of fracturing sections; VP i is the normalized wellhead pressure data;

[0047] The maximum value of the difference between the normalized wellhead pressure data within the preset time window and the arithmetic mean is determined according to the following formula:

[0048]

[0049] wherein, t is the preset time window; is the arithmetic mean of the normalized wellhead pressure data; n is the number of fracturing sections; VP i is the normalized wellhead pressure data; P i,max is the maximum value of the difference between the normalized wellhead pressure data within the preset time window t and the arithmetic mean VP i and

[0050] In one embodiment, according to the wellhead pressure curve, determining the pressure fluctuation frequency and the pressure fluctuation amplitude of the multiple fracturing sections can comprise: determining the pressure fluctuation amplitude of the multiple fracturing sections according to the following formula:

[0051] P = P max -P min

[0052] wherein, P is the pressure fluctuation amplitude; P max is the maximum value of wellhead pressure data of the multiple fracturing sections; P min is the minimum value of wellhead pressure data of the multiple fracturing sections.

[0053] The pressure fluctuation frequency and the pressure fluctuation amplitude of a shale gas well are calculated according to the above method, and the calculation results are shown in Table 1. Figure 3 The fracturing reconstruction effect can be quickly evaluated through simple calculation of the fracturing construction curve, and the required data is less, the data acquisition approach is convenient, and the method is widely applicable.

[0054] ​Fourthly, an evaluation chart of four quadrants of complexity of fracture network is established. The evaluation chart of four quadrants of complexity of fracture network can be drawn, in which the horizontal coordinate is the frequency of pressure fluctuation, the vertical coordinate is the amplitude of pressure fluctuation, the origin is determined in advance, and the evaluation chart is divided into four quadrants. An evaluation chart provided in an embodiment of the present application is shown in FIG. 1. Figure 4

[0055] Fifthly, the data is projected onto the chart. The data of the frequency of pressure fluctuation and the amplitude of pressure fluctuation of all the fracture sections obtained in the second step and the third step is projected onto the evaluation chart.

[0056] In one embodiment, projecting the data of the frequency of pressure fluctuation and the amplitude of pressure fluctuation of the plurality of fracture sections onto the preset evaluation chart can include: determining the coordinates of the plurality of fracture sections on the evaluation chart according to the frequency of pressure fluctuation and the amplitude of pressure fluctuation of the plurality of fracture sections, respectively; and projecting the data of the frequency of pressure fluctuation and the amplitude of pressure fluctuation of the plurality of fracture sections onto the evaluation chart according to the coordinates. For example, the frequency of pressure fluctuation of a certain fracture section A is 15 times, and the amplitude of pressure fluctuation is 15 MPa. The point corresponding to the coordinates (15, 15) of A on the evaluation chart is projected onto the evaluation chart, and the point falls in the first quadrant. Figure 4

[0057] Sixthly, the effect of single-well fracturing is evaluated. The complexity of the fracture network of the fracturing is evaluated based on the projection result of the wellhead pressure of each section in the fifth step.

[0058] In one embodiment, determining the effect of the plurality of fracture sections according to the projection result of the data of the frequency of pressure fluctuation and the amplitude of pressure fluctuation of the plurality of fracture sections on the evaluation chart can include: if the coordinates of a fracture section on the evaluation chart are projected in the first quadrant of the evaluation chart, determining that the effect of the fracturing of the fracture section is a first effect; the horizontal coordinate of a point in the first quadrant is greater than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is greater than the vertical coordinate of the preset origin; if the coordinates of a fracture section on the evaluation chart are projected in the second quadrant of the evaluation chart, determining that the effect of the fracturing of the fracture section is a second effect; the horizontal coordinate of a point in the second quadrant is greater than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is less than the vertical coordinate of the preset origin; if the coordinates of a fracture section on the evaluation chart are projected in the third quadrant of the evaluation chart, determining that the effect of the fracturing of the fracture section is a third effect; the horizontal coordinate of a point in the third quadrant is less than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is less than the vertical coordinate of the preset origin; if the coordinates of a fracture section on the evaluation chart are projected in the fourth quadrant of the evaluation chart, determining that the effect of the fracturing of the fracture section is a fourth effect; the horizontal coordinate of a point in the fourth quadrant is less than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is greater than the vertical coordinate of the preset origin; wherein the first effect is better than the second effect; the second effect is better than the third effect; and the third effect is better than the fourth effect. ​​

[0059] That is, the fracturing segment coordinates in the first quadrant fracturing reconstruction effect > second quadrant fracturing reconstruction effect > third quadrant fracturing reconstruction effect > fourth quadrant fracturing reconstruction effect, and the fracturing segment reconstruction effects in the first and second quadrants are better. The fracturing effect evaluation is fast and convenient by designing the evaluation chart, and has universal operability.

[0060] The daily gas production of a certain shale gas single well is 0.3-3.2 million cubic meters / day, and the initial gas production of the gas well test has large differences, and the fracturing reconstruction effect is one of the main reasons for the initial gas production difference. The microseismic method is not applied to monitor the gas well in the fracturing construction process of part of the shale gas well, so the fracturing reconstruction effect of the gas well cannot be evaluated by conventional means. Figure 5 The result schematic diagram of the fracturing reconstruction effect analysis of the certain shale gas well provided in the embodiment of the present application is shown as Figure 5 The reconstruction effect of the gas well is evaluated by applying the fracturing reconstruction effect analysis method of the embodiment of the present application: first, the wellhead pressure curve shape feature is determined, the pressure fluctuation frequency and the pressure fluctuation amplitude are calculated according to the construction curve, and the calculation results are projected on the evaluation chart. The evaluation result shows that the first, second, third, fourth, 20th, 21st fracturing segments are located in the first quadrant, the artificial fracture length is large, the number is large, a complex fracture network is formed around the well, and the fracturing reconstruction effect is the best; the 5th, 6th, 10th, 11th, 12th, 13th, 14th, 15th, 16th, 18th, and 19th fracturing segments are located in the second quadrant, the artificial fracture length is large, the number is large, a complex fracture network is formed around the well, and the fracturing reconstruction effect is better; the 7th, 8th, 9th, and 17th fracturing segments are located in the third quadrant, the artificial fracture length and the number are relatively small, a complex fracture network is not formed around the well, and the fracturing reconstruction effect is relatively poor.

[0061] The embodiment of the present application also provides a fracturing reconstruction effect analysis device, and the principle is similar to the fracturing reconstruction effect analysis method, which will not be repeated here.

[0062] Figure 6 The schematic diagram of the fracturing reconstruction effect analysis device provided in the embodiment of the present application is shown as Figure 6 The fracturing reconstruction effect analysis device can include:

[0063] The acquisition module 601 is used to acquire the wellhead pressure curve after the shale gas well is fractured and reconstructed;

[0064] The frequency and amplitude determination module 602 is used to determine the pressure fluctuation frequency and the pressure fluctuation amplitude of the plurality of fracturing segments according to the wellhead pressure curve; the pressure fluctuation frequency is the fluctuation times of the wellhead pressure data within a preset time length; and the pressure fluctuation amplitude is the difference between the maximum value and the minimum value of the wellhead pressure data of the plurality of fracturing segments;

[0065] The projection module 603 is used to project the pressure fluctuation frequency and pressure fluctuation amplitude of multiple fracturing sections onto a preset evaluation chart; the evaluation chart is divided into four quadrants by a horizontal axis and a vertical axis; the horizontal axis represents the pressure fluctuation frequency; and the vertical axis represents the pressure fluctuation amplitude.

[0066] The fracturing effect determination module 604 is used to determine the fracturing effect of multiple fracturing segments based on the projection results of the pressure fluctuation frequency and pressure fluctuation amplitude of multiple fracturing segments on the evaluation chart; the fracturing effect reflects the complexity of the fracture network formed by fracturing.

[0067] In one embodiment, the frequency and amplitude determination module can be specifically used for:

[0068] The wellhead pressure data for each fracturing segment in the wellhead pressure curve are homogenized.

[0069] Determine the arithmetic mean of the wellhead pressure data after homogenization;

[0070] Determine the maximum value of the difference between the homogenized wellhead pressure data and the arithmetic mean within a preset time window;

[0071] The number of maxima is determined as the pressure fluctuation frequency of the fracturing section.

[0072] In one embodiment, the frequency and amplitude determination module can be specifically used for:

[0073] The wellhead pressure data for each fracturing segment in the wellhead pressure curve are normalized using the following formula:

[0074]

[0075] Among them, P i Here are the wellhead pressure data for the i-th fracturing stage; VP i The wellhead pressure data is after homogenization; P max P represents the maximum value of wellhead pressure data across multiple fracturing sections. min This represents the minimum wellhead pressure data for multiple fracturing sections;

[0076] The arithmetic mean of the homogenized wellhead pressure data is determined using the following formula:

[0077]

[0078] in, The arithmetic mean of the normalized wellhead pressure data; n is the number of fracturing sections; VP i The wellhead pressure data has been homogenized.

[0079] The maximum value of the difference between the homogenized wellhead pressure data and the arithmetic mean value in the preset time window is determined according to the following formula:

[0080]

[0081] Wherein, t is the preset time window; is the arithmetic mean value of the homogenized wellhead pressure data; VP i is the homogenized wellhead pressure data; P i,max is the maximum value of the difference between the homogenized wellhead pressure data and the arithmetic mean value in the preset time window t. i max min

[0082] In one embodiment, the frequency and amplitude determination module can be specifically used for:

[0083] The pressure fluctuation amplitudes of the multiple fracturing sections are determined according to the following formula:

[0084] P = P max -P min

[0085] Wherein, P is the pressure fluctuation amplitude; P max is the maximum value of the wellhead pressure data of the multiple fracturing sections; P min is the minimum value of the wellhead pressure data of the multiple fracturing sections.

[0086] In one embodiment, the projection module can be specifically used for:

[0087] The coordinates of the multiple fracturing sections on the evaluation chart are determined according to the pressure fluctuation frequency and pressure fluctuation amplitude data of the multiple fracturing sections, respectively;

[0088] The pressure fluctuation frequency and pressure fluctuation amplitude data of the multiple fracturing sections are projected onto the evaluation chart according to the coordinates.

[0089] In this embodiment, the fracturing reconstruction effect determination module can be specifically used for:

[0090] If the coordinates of the fracturing section on the evaluation chart are projected on the first quadrant of the evaluation chart, it is determined that the fracturing reconstruction effect of the fracturing section is a first effect; the horizontal coordinate of the point in the first quadrant is greater than the horizontal coordinate of the preset origin, and the vertical coordinate is greater than the vertical coordinate of the preset origin;

[0091] If the coordinates of the fracturing section on the evaluation chart are projected on the second quadrant of the evaluation chart, it is determined that the fracturing reconstruction effect of the fracturing section is a second effect; the horizontal coordinate of the point in the second quadrant is greater than the horizontal coordinate of the preset origin, and the vertical coordinate is less than the vertical coordinate of the preset origin;

[0092] If the coordinate of the fracturing section on the evaluation chart is projected on the third quadrant of the evaluation chart, the fracturing reconstruction effect of the fracturing section is determined as a third effect; the horizontal coordinate of the point in the third quadrant is less than the horizontal coordinate of the preset origin, and the vertical coordinate of the point in the third quadrant is less than the vertical coordinate of the preset origin;

[0093] If the coordinate of the fracturing section on the evaluation chart is projected on the fourth quadrant of the evaluation chart, the fracturing reconstruction effect of the fracturing section is determined as a fourth effect; the horizontal coordinate of the point in the fourth quadrant is less than the horizontal coordinate of the preset origin, and the vertical coordinate of the point in the fourth quadrant is greater than the vertical coordinate of the preset origin; wherein the first effect is better than the second effect; the second effect is better than the third effect; and the third effect is better than the fourth effect.

[0094] Compared with the technical scheme for analyzing the fracturing reconstruction effect in the prior art, the embodiments of the present application obtain the wellhead pressure curve after the shale gas well is subjected to fracturing reconstruction; determine the pressure fluctuation frequency and the pressure fluctuation amplitude of a plurality of fracturing sections according to the wellhead pressure curve; the pressure fluctuation frequency is the fluctuation times of the wellhead pressure data within a preset time length; the pressure fluctuation amplitude is the difference between the maximum value and the minimum value of the wellhead pressure data of the plurality of fracturing sections; project the pressure fluctuation frequency and the pressure fluctuation amplitude of the plurality of fracturing sections on a preset evaluation chart; the evaluation chart is divided into four quadrants by a horizontal coordinate and a vertical coordinate; the horizontal coordinate is the pressure fluctuation frequency; the vertical coordinate is the pressure fluctuation amplitude; determine the fracturing reconstruction effect of the plurality of fracturing sections according to the projection result of the pressure fluctuation frequency and the pressure fluctuation amplitude of the plurality of fracturing sections on the evaluation chart; the fracturing reconstruction effect reflects the complexity of the fracture network formed by the fracturing reconstruction, and can provide a fracturing reconstruction effect analysis technical scheme with simple operation process, low cost and high timeliness, improve the analysis accuracy, and meet the needs of accurate and rapid evaluation of the fracturing reconstruction effect in the oilfield site.

[0095] By means of the method and device in the embodiments of the present application, the fracturing reconstruction effect can be quickly and accurately evaluated, which can provide an important basis for improving the development effect of a single well. The method in the present application is applied to evaluate the fracturing reconstruction effect of a plurality of shale oil and gas reservoirs, and good results are achieved, which provides guidance for fracturing construction evaluation and process optimization.

[0096] (1) For a fracturing reconstruction gas well without microseismic monitoring, the embodiments of the present application provide a new idea for quickly evaluating the fracturing reconstruction effect; (2) The fracturing reconstruction effect analysis method is simple, and the fracturing reconstruction effect can be quickly evaluated by simple calculation on the fracturing construction curve; (3) The evaluation result is accurate and reliable; the method in the embodiments of the present application is based on the actually measured wellhead pressure data, and avoids the uncertainty of multiple parameter selection; (4) The fracturing reconstruction effect analysis method is fast and convenient, and has universal operability; (5) The required data is less, the data acquisition approach is convenient, and the method is widely applicable.

[0097] The embodiments of the present application also provide a computer device,Figure 7 As a schematic diagram of a computer device in the embodiments of the present application, the computer device 700 comprises a memory 710, a processor 720, and a computer program 730 stored in the memory 710 and capable of running on the processor 720, and the processor 720 implements the fracturing reconstruction effect analysis method described above when executing the computer program 730.

[0098] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the fracturing reconstruction effect analysis method described above.

[0099] The embodiments of the present application also provide a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the fracturing reconstruction effect analysis method described above.

[0100] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage media, etc.) containing computer-usable program code.

[0101] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device implemented in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 means for performing the function specified by the flow or flows and / or block or blocks.

[0102] These computer program instructions can also be stored in a computer readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product comprising instruction means, which implement the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 one or more flows and / or blocks

[0103] These computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are performed on the computer or other programmable data processing devices to generate a computer implemented process, so that the instructions executed on the computer or other programmable data processing devices provide a process for implementing the flowchart Figure 1 one flow or multiple flows and / or the functions specified in the block Figure 1 one flow or multiple flows and / or the functions specified in the block

[0104] The above described specific embodiments, the purpose, technical solutions and beneficial effects of the present application are further described in detail, it should be understood that the above described is only a specific embodiment of the present application, and is not used to limit the protection scope of the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of analyzing the effect of a fracturing treatment, characterized in that, The method comprises the following steps: obtaining a wellhead pressure curve of a shale gas well after fracturing reconstruction; determining pressure fluctuation frequency and pressure fluctuation amplitude of multiple fracturing sections according to the wellhead pressure curve; the pressure fluctuation frequency is the fluctuation times of wellhead pressure data within a preset time length; the pressure fluctuation amplitude is the difference between the maximum and minimum values of wellhead pressure data of the multiple fracturing sections; projecting the pressure fluctuation frequency and pressure fluctuation amplitude of the multiple fracturing sections onto a preset evaluation chart; the evaluation chart is divided into four quadrants by the abscissa and the ordinate; the abscissa is the pressure fluctuation frequency; the ordinate is the pressure fluctuation amplitude; determining the fracturing reconstruction effect of the multiple fracturing sections according to the projection results of the pressure fluctuation frequency and pressure fluctuation amplitude of the multiple fracturing sections on the evaluation chart; the fracturing reconstruction effect reflects the complexity of the fracture network formed by the fracturing reconstruction.

2. The method of claim 1, wherein, The method for determining the pressure fluctuation frequency and pressure fluctuation amplitude of the multiple fracturing sections according to the wellhead pressure curve comprises the following steps: uniformly processing the wellhead pressure data of each fracturing section in the wellhead pressure curve; determining the arithmetic mean of the uniformly processed wellhead pressure data; determining the maximum value of the difference between the uniformly processed wellhead pressure data and the arithmetic mean within a preset time window; determining the pressure fluctuation frequency of the fracturing section as the number of the maximum values.

3. The method of claim 2, wherein, The method for determining the pressure fluctuation frequency and pressure fluctuation amplitude of the multiple fracturing sections according to the wellhead pressure curve comprises the following steps: uniformly processing the wellhead pressure data of each fracturing section in the wellhead pressure curve according to the following formula: wherein P i is the wellhead pressure data of the i-th fracturing section; VP i is the homogenized wellhead pressure data; P max is the maximum value of the wellhead pressure data of the plurality of fracturing sections; P min is the minimum value of the wellhead pressure data of the plurality of fracturing sections; determining the arithmetic mean of the uniformly processed wellhead pressure data according to the following formula: wherein, is the arithmetic mean of the normalized wellhead pressure data; n is the number of fracturing stages; VP i is the normalized wellhead pressure data; determining the maximum value of the difference between the uniformly processed wellhead pressure data and the arithmetic mean within a preset time window according to the following formula: wherein t is a preset time window; is an arithmetic mean of the wellhead pressure data after the homogenization process; VP i is the wellhead pressure data after the homogenization process; Pi,max is a maximum value of VP i and the difference.

4. The method of claim 1, wherein, The method for determining the pressure fluctuation frequency and pressure fluctuation amplitude of the multiple fracturing sections according to the wellhead pressure curve comprises the following steps: determining the pressure fluctuation amplitude of the multiple fracturing sections according to the following formula: P = P max - P min where P is the pressure fluctuation amplitude; P max is the maximum value of the wellhead pressure data for the plurality of fracturing stages; P min is the minimum value of the wellhead pressure data for the plurality of fracturing stages.

5. The method of claim 1, wherein, The method for projecting the pressure fluctuation frequency and pressure fluctuation amplitude data of the multiple fracturing sections onto a preset evaluation chart comprises the following steps: determining the coordinates of the multiple fracturing sections on the evaluation chart according to the pressure fluctuation frequency and pressure fluctuation amplitude data of the multiple fracturing sections, respectively; projecting the pressure fluctuation frequency and pressure fluctuation amplitude data of the multiple fracturing sections onto the evaluation chart according to the coordinates.

6. The method of claim 5, wherein, The method for determining the fracturing reconstruction effect of the multiple fracturing sections according to the projection results of the pressure fluctuation frequency and pressure fluctuation amplitude data of the multiple fracturing sections on the evaluation chart comprises the following steps: if the coordinates of the fracturing section on the evaluation chart are projected on the first quadrant of the evaluation chart, determining the fracturing reconstruction effect of the fracturing section as a first effect; the abscissa of the point in the first quadrant is greater than the abscissa of a preset origin, and the ordinate of the point is greater than the ordinate of the preset origin; if the coordinates of the fracturing section on the evaluation chart are projected on the second quadrant of the evaluation chart, determining the fracturing reconstruction effect of the fracturing section as a second effect; the abscissa of the point in the second quadrant is greater than the abscissa of a preset origin, and the ordinate of the point is less than the ordinate of the preset origin; If the coordinate of the fracturing section on the evaluation chart is projected on the third quadrant of the evaluation chart, a third effect of the fracturing section is determined; the horizontal coordinate of a point in the third quadrant is less than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is less than the vertical coordinate of the preset origin; If the coordinate of the fracturing section on the evaluation chart is projected on the fourth quadrant of the evaluation chart, a fourth effect of the fracturing section is determined; the horizontal coordinate of a point in the fourth quadrant is less than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is greater than the vertical coordinate of the preset origin; wherein the first effect is better than the second effect; the second effect is better than the third effect; and the third effect is better than the fourth effect.

7. A device for analyzing the effect of a fracturing treatment, characterized in that it comprises: Comprise: An acquisition module is configured to acquire wellhead pressure curves of a shale gas well after fracturing reconstruction; A frequency and amplitude determination module is configured to determine pressure fluctuation frequencies and pressure fluctuation amplitudes of a plurality of fracturing sections according to the wellhead pressure curves; the pressure fluctuation frequency is a fluctuation number of wellhead pressure data within a preset time length; and the pressure fluctuation amplitude is a difference between a maximum value and a minimum value of wellhead pressure data of the plurality of fracturing sections; A projection module is configured to project the pressure fluctuation frequencies and the pressure fluctuation amplitudes of the plurality of fracturing sections on a preset evaluation chart; the evaluation chart is divided into four quadrants by a horizontal coordinate and a vertical coordinate; the horizontal coordinate is the pressure fluctuation frequency; and the vertical coordinate is the pressure fluctuation amplitude; A fracturing reconstruction effect determination module is configured to determine fracturing reconstruction effects of the plurality of fracturing sections according to projection results of the pressure fluctuation frequencies and the pressure fluctuation amplitudes of the plurality of fracturing sections on the evaluation chart; the fracturing reconstruction effects reflect complexity of a fracture network formed by fracturing reconstruction.

8. The apparatus of claim 7, wherein, The frequency and amplitude determination module is specifically configured to: uniformly process wellhead pressure data of each fracturing section in the wellhead pressure curve; determine an arithmetic mean value of the uniformly processed wellhead pressure data; determine a maximum value of a difference between the uniformly processed wellhead pressure data and the arithmetic mean value within a preset time window; and determine the pressure fluctuation frequency of the fracturing section as a number of the maximum values.

9. The apparatus of claim 8, wherein, The frequency and amplitude determination module is specifically configured to: uniformly process wellhead pressure data of each fracturing section in the wellhead pressure curve according to the following formula: wherein P i is the wellhead pressure data of the i-th fracturing section; VP i is the homogenized wellhead pressure data; P max is the maximum value of the wellhead pressure data of the plurality of fracturing sections; P min is the minimum value of the wellhead pressure data of the plurality of fracturing sections; determine an arithmetic mean value of the uniformly processed wellhead pressure data according to the following formula: wherein, is the arithmetic mean of the normalized wellhead pressure data; n is the number of fracturing stages; VP i is the normalized wellhead pressure data; determine a maximum value of a difference between the uniformly processed wellhead pressure data and the arithmetic mean value within a preset time window according to the following formula: wherein t is a preset time window; is an arithmetic mean of the wellhead pressure data after the homogenization process; VP i is the wellhead pressure data after the homogenization process; Pi,max is a maximum value of VP i and the difference.

10. The apparatus of claim 7, wherein, The frequency and amplitude determination module is specifically configured to: determine the pressure fluctuation amplitude of the plurality of fracturing sections according to the following formula: P = P max P = P min where P is the pressure fluctuation amplitude; P max is the maximum value of the wellhead pressure data for the plurality of fracturing stages; P min is the minimum value of the wellhead pressure data for the plurality of fracturing stages.

11. The apparatus of claim 7, wherein, The projection module is specifically configured to: determine coordinates of the plurality of fracturing sections on the evaluation chart according to the pressure fluctuation frequency and the pressure fluctuation amplitude data of the plurality of fracturing sections, respectively; and project the pressure fluctuation frequency and the pressure fluctuation amplitude data of the plurality of fracturing sections on the evaluation chart according to the coordinates.

12. The apparatus of claim 11, wherein, The fracturing reconstruction effect determination module is specifically configured to: if the coordinate of the fracturing section on the evaluation chart is projected on the first quadrant of the evaluation chart, a first effect of the fracturing section is determined; the horizontal coordinate of a point in the first quadrant is greater than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is greater than the vertical coordinate of the preset origin; If the coordinate of the fracturing section on the evaluation chart is projected on the second quadrant of the evaluation chart, the fracturing reconstruction effect of the fracturing section is determined as a second effect; the horizontal coordinate of a point in the second quadrant is greater than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is less than the vertical coordinate of the preset origin; If the coordinate of the fracturing section on the evaluation chart is projected on the third quadrant of the evaluation chart, the fracturing reconstruction effect of the fracturing section is determined as a third effect; the horizontal coordinate of a point in the third quadrant is less than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is less than the vertical coordinate of the preset origin; If the coordinate of the fracturing section on the evaluation chart is projected on the fourth quadrant of the evaluation chart, the fracturing reconstruction effect of the fracturing section is determined as a fourth effect; the horizontal coordinate of a point in the fourth quadrant is less than the horizontal coordinate of the preset origin, and the vertical coordinate of the point is greater than the vertical coordinate of the preset origin; wherein the first effect is better than the second effect; the second effect is better than the third effect; and the third effect is better than the fourth effect.

13. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the method of any one of claims 1 to 6 when executing the computer program.

14. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the method of any one of claims 1 to 6.

15. A computer program product, characterised in that, The computer program product comprises a computer program, and the computer program is executed by the processor to implement the method of any one of claims 1 to 6.

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