Method, apparatus and processor for evaluating fishbone completion development effect and application potential

Abstract

The application provides a method, device and processor for evaluating fishbone completion development effect and application potential, and belongs to the field of oilfield development. The method comprises the following steps: obtaining basic data of fishbone completion to be evaluated; determining static evaluation indexes, completion construction evaluation indexes, physical property characteristic evaluation indexes and production dynamic evaluation indexes of the fishbone completion to be evaluated based on the obtained basic data; determining fishbone completion development effect based on the four types of indexes of the fishbone completion to be evaluated; predicting physical property characteristics of a comparison region based on comparison of geological data, engineering data and production data of the comparison region to obtain predicted physical property parameters of the comparison region; and obtaining fishbone completion application potential evaluation results based on comparison of the physical property characteristic evaluation indexes of the fishbone completion to be evaluated and the predicted physical property parameters. The application combines the characteristics of fishbone completion, and realizes comprehensive and accurate evaluation of fishbone completion development effect and application potential.

Description

Technical Field

[0001] This invention relates to the field of oilfield development technology, and more specifically to a method, apparatus, and processor for evaluating the development effect and application potential of fishbone well completions. Background Technology

[0002] In tight carbonate reservoirs, horizontal and directional well techniques are effective means to improve reservoir utilization. However, due to the dense matrix of this type of carbonate reservoir, conventional completion methods often result in high initial production but unstable production, significantly limiting the efficient development of this type of reservoir. To achieve efficient development of tight carbonate reservoirs, some regions have begun to explore the use of fishbone completion methods. Fishbone completion has significant implications and economic benefits in increasing recoverable reserves, improving single-well production, reducing extraction costs, and developing complex oil and gas reservoirs. Therefore, evaluating the development effect, application potential, and production enhancement of fishbone completion has become a hot topic in the field of oil and gas reservoir development. Existing technologies for evaluating the development effect and application potential of completions mainly consist of numerical simulation and quantitative analysis. However, there is currently a lack of a method for evaluating the development effect and application potential based on the characteristics of fishbone completions themselves. Therefore, existing evaluation methods cannot comprehensively and accurately evaluate the development effect and application potential of fishbone completions. Summary of the Invention

[0003] The purpose of this invention is to provide a method, apparatus, and processor for evaluating the development effect and application potential of fishbone well completions, which are used to evaluate the application potential based on the characteristics of fishbone well completions.

[0004] To achieve the above objectives, firstly, this application provides a method for evaluating the development effect and application potential of fishbone well completions, comprising:

[0005] Obtain the basic data of the fishbone completion to be evaluated, including geological data, engineering data, well test data and production data;

[0006] Based on the acquired basic data, the static evaluation index, well completion construction evaluation index, physical property evaluation index and production dynamic evaluation index of the fishbone well to be evaluated were determined.

[0007] Based on the static evaluation index, well completion construction evaluation index, physical property evaluation index and production dynamic evaluation index of the fishbone well to be evaluated, the development effect of the fishbone well is determined.

[0008] Based on the geological, engineering, and production data of the comparison area, the physical property characteristics of the comparison area are predicted to obtain the predicted physical property parameters of the comparison area; wherein, the comparison area is a region with the same type of fishbone completion reservoir as the one to be evaluated, and the development of the comparison area adopts non-fishbone construction.

[0009] Based on the comparison of the physical property characteristics evaluation index of the fishbone completion to be evaluated and the predicted physical property parameters, the evaluation result of the application potential of the fishbone completion is obtained.

[0010] Optionally, based on the acquired basic data, determine the static evaluation indicators, well completion construction evaluation indicators, physical property evaluation indicators, and production dynamic evaluation indicators for the fishbone well to be evaluated, including:

[0011] Based on the analysis of geological data, static evaluation indicators were determined; the geological data included core samples and well logging data.

[0012] Based on the engineering data, the evaluation indicators for well completion construction are determined; among which, the engineering data includes the actual protrusion length of each bone spike in the formation and the corresponding design length;

[0013] Based on the analysis of well test data, the evaluation indicators for physical properties were determined;

[0014] Based on the production data, dynamic evaluation indicators for production are determined; among them, production data include oil pressure and crude oil production.

[0015] Optionally, based on geological data analysis, static evaluation indicators may be determined, including:

[0016] Core description was performed on the core samples to determine the reservoir type;

[0017] Well logging data interpretation yields the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir.

[0018] Sedimentary facies type, fracture development degree, and reservoir longitudinal and transverse development characteristics are used as static evaluation indicators.

[0019] Optionally, well completion evaluation indicators can be calculated and determined based on engineering data, including:

[0020] Divide the actual protrusion length of each bone spike in the formation by the corresponding design length to obtain the ratio of each bone spike to the corresponding design length;

[0021] Based on the ratio of all bone spikes to the corresponding design length in the fishbone completion to be evaluated, the average ratio of bone spikes to design length is obtained;

[0022] The average ratio of bone spurs to the designed length is used as an evaluation index for well completion construction.

[0023] Optionally, based on the analysis of well test data, determine the evaluation indicators of physical properties, including:

[0024] Analyze the well test data to obtain the current physical property parameters; wherein, the current physical property parameters include one or more of the following: formation coefficient, productivity index, fracture half-length, equivalent seepage radius, equivalent permeability, and skin coefficient;

[0025] Use the current physical property parameters as evaluation indicators for physical property characteristics.

[0026] Optionally, production dynamic evaluation indicators can be calculated and determined based on production data, including:

[0027] Plot a curve with crude oil production on the x-axis and oil pressure on the y-axis to obtain an indicator curve;

[0028] Calculate the slope of the indicator curve;

[0029] The slope of the indicator curve is used as an indicator for evaluating production dynamics.

[0030] Optionally, the development effect of the fishbone well completion can be determined based on static evaluation indicators, well completion construction evaluation indicators, physical property evaluation indicators, and production dynamic evaluation indicators, including:

[0031] The degree of fracture development and the longitudinal and transverse development characteristics of the reservoir type are set as the judgment criteria. The static evaluation indicators are judged to determine whether they meet the judgment criteria, and the geological improvement before and after the construction of the fishbone completion skeleton is obtained.

[0032] Based on the comparison results between the preset threshold and the well completion construction evaluation index, the construction status of the fishbone well completion bone spikes to be evaluated is obtained.

[0033] The historical physical property parameters of the fishbone completion to be evaluated before the construction of the bone spike are obtained, and the historical physical property parameters are compared with the physical property characteristic evaluation index to obtain the improvement of reservoir physical properties before and after the construction of the bone spike in the fishbone completion to be evaluated.

[0034] Obtain the oil pressure and crude oil production of the fishbone completion to be evaluated before the construction of the fishbone spike, and evaluate the improvement of crude oil production before and after the construction of the fishbone completion based on the oil pressure and crude oil production before the construction of the fishbone spike and the production dynamic evaluation indicators.

[0035] A comprehensive evaluation is conducted based on the geological improvement, reservoir property improvement, crude oil production improvement, and the construction of the fishbone completion spikes before and after the construction of the spikes, to obtain the development effect of the fishbone completion.

[0036] Secondly, this application also provides an apparatus for evaluating the development effect and application potential of fishbone well completions, comprising:

[0037] The acquisition unit is used to acquire the basic data of the fishbone well completion to be evaluated, including geological data, engineering data, well test data and production data;

[0038] The indicator determination unit is used to determine the static evaluation indicators, well completion construction evaluation indicators, physical property evaluation indicators, and production dynamic evaluation indicators of the fishbone well to be evaluated, based on the acquired basic data.

[0039] The effect determination unit is used to determine the development effect of the fishbone well completion based on the static evaluation index, well completion construction evaluation index, physical property evaluation index and production dynamic evaluation index of the fishbone well to be evaluated.

[0040] The prediction unit is used to predict the physical property characteristics of the comparison area based on the geological data, engineering data and production data of the comparison area, and to obtain the predicted physical property parameters of the comparison area; wherein, the comparison area is a region with the same type of fishbone completion reservoir as the one to be evaluated, and the development of the comparison area adopts non-fishbone construction.

[0041] The evaluation unit is used to compare the physical property characteristics evaluation index of the fishbone completion to be evaluated with the predicted physical property parameters to obtain the evaluation result of the application potential of the fishbone completion.

[0042] Optionally, the indicator determination unit includes:

[0043] The first processing unit is used to determine static evaluation indicators based on geological data analysis; the geological data includes core samples and well logging data.

[0044] The second processing unit is used to calculate and determine the well completion construction evaluation index based on the engineering data; the engineering data includes the actual protrusion length of each bone spike in the formation and the corresponding design length.

[0045] The third processing unit is used to determine the physical property evaluation indicators based on the analysis of well test data;

[0046] The fourth processing unit is used to calculate and determine dynamic production evaluation indicators based on production data, which include oil pressure and crude oil production.

[0047] Optionally, the first processing unit includes:

[0048] The description unit is used to describe the core sample and obtain the reservoir type.

[0049] The interpretation unit is used to interpret well logging data to obtain the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir.

[0050] The first output unit is used to take sedimentary facies type, fracture development degree and reservoir longitudinal and transverse development characteristics as static evaluation indicators.

[0051] Optionally, the second processing unit includes:

[0052] The first calculation unit is used to divide the actual protrusion length of each bone spike in the formation by the corresponding design length to obtain the ratio of each bone spike to the corresponding design length.

[0053] The second calculation unit is used to obtain the average ratio of bone spurs to design length based on the ratio of all bone spurs to the corresponding design length in the fishbone completion to be evaluated.

[0054] The second output unit is used to use the average ratio of bone spurs to the design length as an evaluation index for well completion construction.

[0055] Optionally, the third processing unit includes:

[0056] The analysis unit is used to analyze well test data to obtain current physical property parameters; wherein, the current physical property parameters include one or more of the following: formation coefficient, productivity index, fracture half-length, equivalent seepage radius, equivalent permeability, and skin coefficient;

[0057] The third output unit is used to use the current physical property parameters as evaluation indicators of physical property characteristics.

[0058] Optionally, the fourth processing unit includes:

[0059] The plotting unit is used to create an indicator curve with crude oil production as the horizontal axis and oil pressure as the vertical axis.

[0060] The third calculation unit is used to calculate the slope of the indicator curve;

[0061] The fourth output unit is used to use the slope of the indicator curve as a production dynamic evaluation index.

[0062] Optionally, the effect determination unit includes:

[0063] The first evaluation unit is used to set the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir type as the judgment criteria to determine whether the static evaluation indicators meet the judgment criteria and to obtain the geological improvement before and after the construction of the fishbone well completion skeleton.

[0064] The second evaluation unit is used to obtain the construction status of the fishbone well completion spurs to be evaluated based on the comparison results between the preset threshold and the well completion construction evaluation index.

[0065] The third evaluation unit is used to obtain the historical physical property parameters of the fishbone completion to be evaluated before the construction of the bone spike, and compare the historical physical property parameters with the physical property characteristic evaluation index to obtain the improvement of reservoir physical properties before and after the construction of the bone spike in the fishbone completion to be evaluated.

[0066] The fourth evaluation unit is used to obtain the oil pressure and crude oil production of the fishbone completion to be evaluated before the construction of the fishbone spike, and to evaluate and determine the improvement of crude oil production before and after the construction of the fishbone completion based on the oil pressure and crude oil production before the construction of the fishbone spike and the production dynamic evaluation indicators.

[0067] The fifth evaluation unit is used to comprehensively evaluate the geological improvement, reservoir property improvement, crude oil production improvement, and construction status of the fishbone completion before and after the construction of the fishbone spike, and to obtain the development effect of the fishbone completion.

[0068] Thirdly, this application also provides a machine-readable storage medium storing instructions for causing a machine to execute the above-described method for evaluating the development effect and application potential of fishbone well completions.

[0069] Fourthly, this application also provides a processor for running a program, wherein the program, when run, is used to perform the above-described method for evaluating the development effect and application potential of fishbone well completions.

[0070] Through the above technical solution, this invention provides a comprehensive analysis of fishbone well completion, obtaining static evaluation indicators, well completion construction evaluation indicators, physical property evaluation indicators, and production dynamic evaluation indicators. Each evaluation indicator is compared with the corresponding parameters before fishbone construction to obtain the development effect of the fishbone well completion. The physical property evaluation indicators are compared with predicted physical property parameters of similar reservoir areas to obtain the application potential of the fishbone well completion. This invention, by combining the inherent characteristics of fishbone well completion, achieves a comprehensive and accurate evaluation of its development effect and application potential.

[0071] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0072] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0073] Figure 1 This is a flowchart illustrating the method for evaluating the development effect and application potential of fishbone well completion proposed in this embodiment of the invention.

[0074] Figure 2 This is a schematic diagram of the slope of different indicator curves for fishbone construction proposed in an embodiment of the present invention;

[0075] Figure 3 This is a histogram comparing the protruding length of the bone spur with the designed length in an embodiment of the present invention;

[0076] Figure 4 This is a schematic diagram of the indicator curves for well A and non-fishbone construction completion in an embodiment of the present invention;

[0077] Figure 5 This is a dynamic curve of actual production of well A in an embodiment of the present invention. Detailed Implementation

[0078] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0079] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with relevant regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0080] Example 1:

[0081] like Figure 1 As shown, this embodiment provides a method for evaluating the development effect and application potential of fishbone well completion, including:

[0082] Step 1: Obtain the basic data of the fishbone well completion to be evaluated. The basic data includes geological data, engineering data, well test data and production data.

[0083] It should be noted that in practical applications, some well completions may lack geological data, engineering data, well test data, or production data. If well test data is missing, well test data or physical property parameters from similar oilfields will be used as evaluation indicators for physical property characteristics. "Similar oilfields" refers to oilfields whose reservoir physical properties and fluid properties are similar to those of the fishbone completion being evaluated. If geological data, engineering data, or production data are missing, they will not be considered in subsequent evaluation processes.

[0084] Step 2: Based on the acquired basic data, determine the static evaluation index, well completion construction evaluation index, physical property evaluation index, and production dynamic evaluation index for the fishbone well to be evaluated.

[0085] In this embodiment, step 2 includes:

[0086] Step 21: Based on the analysis of geological data, determine the static evaluation indicators; the geological data includes core samples and well logging data.

[0087] Step 22: Calculate and determine the well completion construction evaluation index based on the engineering data; the engineering data includes the actual protrusion length of each bone spike in the formation and the corresponding design length;

[0088] Step 23: Based on the analysis of well test data, determine the evaluation indicators for physical property characteristics;

[0089] Step 24: Calculate and determine the dynamic evaluation indicators of production based on the production data; among which, the production data include oil pressure and crude oil production.

[0090] Specifically, by analyzing and calculating these four types of data, comprehensive evaluation indicators are established.

[0091] In this embodiment, step 21, determining static evaluation indicators based on geological data analysis, includes:

[0092] Core description was performed on the core samples to determine the reservoir type;

[0093] Well logging data interpretation yields the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir.

[0094] Sedimentary facies type, fracture development degree, and reservoir longitudinal and transverse development characteristics are used as static evaluation indicators.

[0095] Specifically, by performing core characterization on core samples, basic characteristics of the reservoir, such as porosity, permeability, and fluid properties, can be obtained, ensuring a comprehensive understanding of the reservoir. In addition to the above indicators, well logging data can also determine key parameters such as the thickness, layer position, and oil saturation of oil and gas layers. Determining static evaluation indicators helps to understand the initial state of the formation and its changes.

[0096] In this embodiment, step 22, calculating and determining well completion construction evaluation indicators based on engineering data, includes:

[0097] Divide the actual protrusion length of each bone spike in the formation by the corresponding design length to obtain the ratio of each bone spike to the corresponding design length;

[0098] Based on the ratio of all bone spikes to the corresponding design length in the fishbone completion to be evaluated, the average ratio of bone spikes to design length is obtained;

[0099] The average ratio of bone spurs to the designed length is used as an evaluation index for well completion construction.

[0100] Specifically, the difference between the actual protrusion length of the bone spike in the formation and the corresponding design length can reflect the accuracy of the construction. Therefore, in this embodiment, the average ratio of the bone spike to the design length is used as an evaluation index for well completion construction, which can effectively evaluate the construction quality.

[0101] In this embodiment, step 23, determining the physical property evaluation index based on well test data analysis, includes:

[0102] Analyze the well test data to obtain the current physical property parameters; wherein, the current physical property parameters include one or more of the following: formation coefficient, productivity index, fracture half-length, equivalent seepage radius, equivalent permeability, and skin coefficient;

[0103] Use the current physical property parameters as evaluation indicators for physical property characteristics.

[0104] Specifically, well test data includes pressure test data and fluid test data, which are used to understand the flow characteristics of the fishbone completion to be evaluated.

[0105] In this embodiment, step 24, calculating and determining the dynamic evaluation indicators of production based on production data, includes:

[0106] Plot a curve with crude oil production on the x-axis and oil pressure on the y-axis to obtain an indicator curve;

[0107] Calculate the slope of the indicator curve;

[0108] The slope of the indicator curve is used as an indicator for evaluating production dynamics.

[0109] Specifically, by plotting indicator curves, the dynamic changes of oil wells at different production stages can be clearly displayed, intuitively reflecting the well's production status. The slope of the indicator curve is quantified as an evaluation index of the oil well's production capacity.

[0110] Step 3: Determine the development effect of the fishbone well completion based on the static evaluation index, well completion construction evaluation index, physical property evaluation index and production dynamic evaluation index of the fishbone well to be evaluated.

[0111] In this embodiment, step 3 includes:

[0112] Step 31: Set the degree of fracture development and longitudinal and transverse development characteristics of the reservoir type as the judgment criteria, and judge whether the static evaluation indicators meet the judgment criteria to obtain the geological improvement before and after the construction of the fishbone completion.

[0113] It should be noted that the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir type can be determined based on expert experience or through data statistics.

[0114] Step 32: Based on the comparison results between the preset threshold and the well completion construction evaluation index, obtain the construction status of the fishbone well completion bone spikes to be evaluated.

[0115] Step 33: Obtain the historical physical property parameters of the fishbone completion to be evaluated before the construction of the bone spike, and compare the historical physical property parameters with the physical property characteristic evaluation index to obtain the improvement of reservoir physical properties before and after the construction of the bone spike in the fishbone completion to be evaluated.

[0116] Step 34: Obtain the oil pressure and crude oil production of the fishbone completion to be evaluated before the construction of the fishbone spike, and evaluate the improvement of crude oil production before and after the construction of the fishbone completion based on the oil pressure and crude oil production before the construction of the fishbone spike and the production dynamic evaluation index.

[0117] Step 35: Based on the geological improvement, reservoir property improvement, crude oil production improvement and the construction of the fishbone completion spikes before and after the construction of the spikes, a comprehensive evaluation is conducted to obtain the development effect of the fishbone completion.

[0118] Specifically, by comparing various indicators before and after fishbone well completion, the development effect of fishbone well completion can be clearly and accurately obtained. In step 31, for example, if the porosity is below 12% and the permeability is below 1 mD before fishbone well completion, and the porosity reaches or exceeds 12% and the permeability reaches or exceeds 1 mD after completion, the geology is considered improved. In step 32, the preset threshold is 50% to 80%. When the well completion evaluation index is ≥80%, the construction situation is judged as good; when 50% ≤ well completion evaluation index < 80%, the construction situation is judged as moderate; when the well completion evaluation index ≤ 50%, the construction situation is judged as poor. The preset threshold can be adjusted according to the actual situation; for example, for some areas where fracturing is difficult, the preset threshold can be reduced. In step 33, if the physical property evaluation index is significantly better than the historical physical property parameters, it indicates that the reservoir physical properties have been greatly improved; if the physical property evaluation index is almost the same as the historical physical property parameters, it indicates that the reservoir physical properties have not been improved. In step 34, if... Figure 2 As shown in the figure, the horizontal axis represents crude oil production, and the vertical axis represents oil pressure. Letters A, B, and C represent the slopes of the curves. Without any engineering measures, the slope of the production dynamic curve is shown as A. After construction, it changes to curve C, indicating that the curve slope has increased and crude oil production has improved. If, after construction, it changes to curve C, it indicates that the slope of the curve has increased, the fishbone construction has contaminated the reservoir, and crude oil production has decreased. If all or most of the indicators in step 35 are positive, it indicates good development results; if half of the indicators are positive and half are negative, or if most indicators are neutral, it indicates average development results; if most indicators are negative, it indicates poor development results.

[0119] Step 4: Based on the geological, engineering, and production data of the comparison area, predict the physical property characteristics of the comparison area to obtain the predicted physical property parameters of the comparison area; wherein, the comparison area is a region with the same type of fishbone completion reservoir as the one to be evaluated, and the development of the comparison area adopts non-fishbone construction.

[0120] Specifically, non-fishbone well completions include stepped horizontal wells, branched horizontal wells, multi-bottom horizontal wells, dual horizontal wells, and long horizontal section horizontal wells. Step 4, based on comprehensive reservoir geological understanding and combined with geophysics, uses geological, engineering, and production data from non-fishbone well completions to make predictions. Based on the prediction results, a comparative analysis is conducted on the deployment locations of implemented fishbone wells and the reservoir properties of other regions.

[0121] Step 5: Based on the evaluation index of the physical property characteristics of the fishbone completion to be evaluated and the predicted physical property parameters, the evaluation result of the application potential of the fishbone completion is obtained.

[0122] Specifically, in step 5, the physical property parameters of a certain stepped horizontal well are predicted after completion. In this embodiment, the evaluation index of the physical property characteristics of the fishbone completion is better than the predicted physical property parameters of the stepped horizontal well completion. This indicates that in areas with the same reservoir type as the fishbone completion, the fishbone completion has great application potential. In areas with the same reservoir type and in the area surrounding the fishbone completion, it is possible to further deploy horizontal wells and use the fishbone completion method for efficient development.

[0123] In some specific implementations, step 6 is also included:

[0124] Based on the development effect of fishbone completion, the control factors of the fishbone completion to be evaluated are determined;

[0125] Based on the control factors of the fishbone completion to be evaluated, the optimization direction of the fishbone completion to be evaluated is determined.

[0126] For example, comparing oil wells with different fishbone completion evaluation indicators, the results show that wells with higher completion evaluation indicators have better development effects. This indicates that the actual protrusion length of the fishbone spike is a controlling factor in the fishbone completion evaluation. Therefore, the optimization direction is to focus on controlling the actual protrusion length of the fishbone spike when performing fishbone completion. If the development effects of oil wells with different fishbone completion evaluation indicators are similar, it indicates that the actual protrusion length of the fishbone spike is not a controlling factor. However, if the crude oil production of oil wells with different fishbone completion evaluation indicators is improved, the optimization direction is to perform fishbone completion on this type of reservoir in the surrounding area, but it is not necessary to force the construction condition of the fishbone spike protrusion length. If the reservoir's physical properties and crude oil production do not change after fishbone completion, it is determined that fishbone completion is unnecessary for this type of reservoir.

[0127] This embodiment also provides an apparatus for evaluating the development effect and application potential of fishbone well completions, comprising:

[0128] The acquisition unit is used to acquire the basic data of the fishbone well completion to be evaluated, including geological data, engineering data, well test data and production data;

[0129] The indicator determination unit is used to determine the static evaluation indicators, well completion construction evaluation indicators, physical property evaluation indicators, and production dynamic evaluation indicators of the fishbone well to be evaluated, based on the acquired basic data.

[0130] The effect determination unit is used to determine the development effect of the fishbone well completion based on the static evaluation index, well completion construction evaluation index, physical property evaluation index and production dynamic evaluation index of the fishbone well to be evaluated.

[0131] The prediction unit is used to predict the physical property characteristics of the comparison area based on the geological data, engineering data and production data of the comparison area, and to obtain the predicted physical property parameters of the comparison area; wherein, the comparison area is a region with the same type of fishbone completion reservoir as the one to be evaluated, and the development of the comparison area adopts non-fishbone construction.

[0132] The evaluation unit is used to compare the physical property characteristics evaluation index of the fishbone completion to be evaluated with the predicted physical property parameters to obtain the evaluation result of the application potential of the fishbone completion.

[0133] Optionally, the indicator determination unit includes:

[0134] The first processing unit is used to determine static evaluation indicators based on geological data analysis; the geological data includes core samples and well logging data.

[0135] The second processing unit is used to calculate and determine the well completion construction evaluation index based on the engineering data; the engineering data includes the actual protrusion length of each bone spike in the formation and the corresponding design length.

[0136] The third processing unit is used to determine the physical property evaluation indicators based on the analysis of well test data;

[0137] The fourth processing unit is used to calculate and determine dynamic production evaluation indicators based on production data, which include oil pressure and crude oil production.

[0138] Optionally, the first processing unit includes:

[0139] The description unit is used to describe the core sample and obtain the reservoir type.

[0140] The interpretation unit is used to interpret well logging data to obtain the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir.

[0141] The first output unit is used to take sedimentary facies type, fracture development degree and reservoir longitudinal and transverse development characteristics as static evaluation indicators.

[0142] Optionally, the second processing unit includes:

[0143] The first calculation unit is used to divide the actual protrusion length of each bone spike in the formation by the corresponding design length to obtain the ratio of each bone spike to the corresponding design length.

[0144] The second calculation unit is used to obtain the average ratio of bone spurs to design length based on the ratio of all bone spurs to the corresponding design length in the fishbone completion to be evaluated.

[0145] The second output unit is used to use the average ratio of bone spurs to the design length as an evaluation index for well completion construction.

[0146] Optionally, the third processing unit includes:

[0147] The analysis unit is used to analyze well test data to obtain current physical property parameters; wherein, the current physical property parameters include one or more of the following: formation coefficient, productivity index, fracture half-length, equivalent seepage radius, equivalent permeability, and skin coefficient;

[0148] The third output unit is used to use the current physical property parameters as evaluation indicators of physical property characteristics.

[0149] Optionally, the fourth processing unit includes:

[0150] The plotting unit is used to create an indicator curve with crude oil production as the horizontal axis and oil pressure as the vertical axis.

[0151] The third calculation unit is used to calculate the slope of the indicator curve;

[0152] The fourth output unit is used to use the slope of the indicator curve as a production dynamic evaluation index.

[0153] Optionally, the effect determination unit includes:

[0154] The first evaluation unit is used to set the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir type as the judgment criteria to determine whether the static evaluation indicators meet the judgment criteria and to obtain the geological improvement before and after the construction of the fishbone well completion skeleton.

[0155] The second evaluation unit is used to obtain the construction status of the fishbone well completion spurs to be evaluated based on the comparison results between the preset threshold and the well completion construction evaluation index.

[0156] The third evaluation unit is used to obtain the historical physical property parameters of the fishbone completion to be evaluated before the construction of the bone spike, and compare the historical physical property parameters with the physical property characteristic evaluation index to obtain the improvement of reservoir physical properties before and after the construction of the bone spike in the fishbone completion to be evaluated.

[0157] The fourth evaluation unit is used to obtain the oil pressure and crude oil production of the fishbone completion to be evaluated before the construction of the fishbone spike, and to evaluate and determine the improvement of crude oil production before and after the construction of the fishbone completion based on the oil pressure and crude oil production before the construction of the fishbone spike and the production dynamic evaluation indicators.

[0158] The fifth evaluation unit is used to comprehensively evaluate the geological improvement, reservoir property improvement, crude oil production improvement, and construction status of the fishbone completion before and after the construction of the fishbone spike, and to obtain the development effect of the fishbone completion.

[0159] This embodiment also provides a machine-readable storage medium storing instructions for causing a machine to perform the above-described method for evaluating the development effect and application potential of fishbone well completions.

[0160] This embodiment also provides a processor for running a program, wherein the program is run to perform the above-described method for evaluating the development effect and application potential of fishbone well completions.

[0161] The device for evaluating the development effect and application potential of fishbone well completion includes a processor and a memory. The aforementioned acquisition unit, index determination unit, effect determination unit, prediction unit, and evaluation unit are all stored as program units in the memory. The processor executes the aforementioned program units stored in the memory to achieve the corresponding functions.

[0162] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters allows for a comprehensive evaluation of the development effect and application potential of fishbone well completion systems.

[0163] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0164] This invention provides a storage medium storing a program that, when executed by a processor, implements the method for evaluating the development effect and application potential of fishbone well completions.

[0165] This invention provides a processor for running a program, wherein the program executes the method for evaluating the development effect and application potential of fishbone well completions.

[0166] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: (method claim steps, exclusive claim + subordinate claim). The device described herein can be a server, PC, PAD, mobile phone, etc.

[0167] This application also provides a computer program product, which, when executed on a data processing device, is adapted to perform the steps of the method for evaluating the development effect and application potential of fishbone well completions:

[0168] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0169] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations 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, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0170] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0171] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1The steps of the function specified in one or more boxes.

[0172] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0173] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0174] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0175] Example 2:

[0176] A horizontal well, A, using the fishbone completion method in a certain area, encountered a tight carbonate reservoir located in a low-energy sedimentary environment. The reservoir porosity of the target layer was 10%–14%, with permeability mainly ranging from 0.3 mD to 7 mD. The fishbone completion method was used, with each section designed to have 4 needles, for a total of 20 sections and 80 needles.

[0177] The application potential of Well A is evaluated using the method, storage device, medium, and processor described in Example 1.

[0178] Specifically, the geological data analysis results of Well A show that the well encountered a high degree of microfracture development in the target layer, and high-angle fractures were also found.

[0179] The formula for calculating the well completion construction evaluation index is as follows:

[0180]

[0181] In the above formula, This indicates the evaluation index for well completion construction. The actual extension length and the design length are in the same unit, both in meters (m) or feet (ft).

[0182] The completion evaluation indicators for Well A are as follows: Well A has 20 sub-subs, each with 4 needles, for a total of 80 needles. The designed needle length is 40 ft, the average protrusion length is 21 ft (53%), and the minimum protrusion length is only 2 ft. The histogram comparing the protrusion length of the bone spur with the designed length is shown below. Figure 3 As shown.

[0183] Based on the well test data of Well A, the physical property evaluation indicators are shown in Table 1 below:

[0184] Table 1

[0185]

[0186] It can be seen that the permeability can reach 14.5 mD, the formation factor is 1590 mD.ft, the productivity index is 8.5 bbl / d / psi, and the explained fracture half-length can reach 608 ft. This indicates that the effective permeability and fluid supply capacity of the tight carbonate reservoir are increased after the fishbone completion method.

[0187] Indicator curves for well A and non-fishbone construction completion are as follows: Figure 4 As shown, the non-fishbone construction completion wells are designated as reference well 1, reference well 2, and reference well 4. Figure 4 The results show that the controlled reserves of a single well are comparable to those of horizontal wells deployed in reservoirs with good reservoir properties, indicating that the fishbone completion method achieved good reserve control in tight carbonate reservoirs. Meanwhile, based on the changing trends of the production dynamics curve of Well A and the changes in crude oil production and oil pressure, the production dynamics curve is as follows: Figure 5 As shown, it can be further confirmed that the fishbone completion method can effectively connect tight reservoirs in this type of reservoir. The implementation of this measure can help oil wells achieve high production and have a long stable production period, indicating that this completion method has achieved good development results.

[0188] This tight carbonate reservoir has a high degree of microfracture development. The average extension length of the fishbone completion is 21 ft. Data such as equivalent permeability, productivity index, and equivalent formation coefficient interpreted from well tests show that the fishbone completion method significantly improves the permeability and reserve control of the tight carbonate reservoir. Furthermore, actual production dynamics results show that the fishbone completion method can achieve high and stable production dynamics in tight carbonate reservoirs, providing a new completion method for the efficient development of this type of reservoir.

[0189] By comparing and analyzing the implementation effects of the fishbone completion in Well A, it can be determined that there is a certain degree of microfracture development in the tight carbonate reservoir. Furthermore, by extending the fishbone completion into the formation through multiple stages, the reservoir connectivity can be effectively expanded, further improving the utilization of reserves. Therefore, it is determined that the relatively developed microfractures are the main controlling geological factor for the effectiveness of the fishbone completion measure, and the extension length of the fishbone needles is the main controlling factor for the development effect of the fishbone completion. Further improvements in the implementation effect of this measure can be achieved by further understanding the reservoir geological characteristics around the well and optimizing the design based on differences in the extension length of the fishbone needles, such as acid concentration.

[0190] Based on the reservoir properties of similar areas, the fishbone completion method has been identified as having application potential in this reservoir type. Further deployment of horizontal wells using the fishbone completion method can be considered in the vicinity of existing fishbone completions for efficient development.

[0191] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. The terms "first," "second," etc., are used only for distinction and do not indicate degree of importance.

[0192] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for evaluating the development effect and application potential of fishbone well completion, characterized in that, include: Obtain the basic data of the fishbone completion to be evaluated, including geological data, engineering data, well test data and production data; Based on the acquired basic data, the static evaluation indicators, well completion construction evaluation indicators, physical property evaluation indicators, and production dynamic evaluation indicators for the fishbone well completion to be evaluated were determined, including: Based on the analysis of geological data, static evaluation indicators were determined; the geological data included core samples and well logging data. Based on engineering data, well completion construction evaluation indicators are determined; wherein, the engineering data includes the actual protrusion length of each bone spike in the formation and the corresponding design length, and the well completion construction evaluation indicators include the ratio of the actual protrusion length of the bone spike in the formation to the corresponding design length. Based on the analysis of well test data, the evaluation indicators for physical properties were determined; Based on the production data, dynamic production evaluation indicators are determined; among them, production data include oil pressure and crude oil production. Based on the static evaluation index, well completion construction evaluation index, physical property evaluation index and production dynamic evaluation index of the fishbone well to be evaluated, the development effect of the fishbone well is determined. Based on the geological, engineering, and production data of the comparison area, the physical property characteristics of the comparison area are predicted to obtain the predicted physical property parameters of the comparison area; wherein, the comparison area is a region with the same type of fishbone completion reservoir as the one to be evaluated, and the development of the comparison area adopts non-fishbone construction. Based on the comparison between the physical property evaluation index of the fishbone completion to be evaluated and the predicted physical property parameters, the evaluation result of the application potential of fishbone completion is obtained.

2. The method for evaluating the development effect and application potential of fishbone well completion according to claim 1, characterized in that, Based on geological data analysis, static evaluation indicators were determined, including: Core description was performed on the core samples to determine the reservoir type; Well logging data interpretation yields the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir. Sedimentary facies type, fracture development degree, and reservoir longitudinal and transverse development characteristics are used as static evaluation indicators.

3. The method for evaluating the development effect and application potential of fishbone well completion according to claim 1, characterized in that, Based on engineering data, the evaluation indicators for well completion construction were determined, including: Divide the actual protrusion length of each bone spike in the formation by the corresponding design length to obtain the ratio of each bone spike to the corresponding design length; Based on the ratio of all bone spikes to the corresponding design length in the fishbone completion to be evaluated, the average ratio of bone spikes to design length is obtained; The average ratio of bone spurs to the designed length is used as an evaluation index for well completion construction.

4. The method for evaluating the development effect and application potential of fishbone well completion according to claim 1, characterized in that, Based on the analysis of well test data, the evaluation indicators for physical properties were determined, including: Analyze the well test data to obtain the current physical property parameters; wherein, the current physical property parameters include one or more of the following: formation coefficient, productivity index, fracture half-length, equivalent seepage radius, equivalent permeability, and skin coefficient; Use the current physical property parameters as evaluation indicators for physical property characteristics.

5. The method for evaluating the development effect and application potential of fishbone well completion according to claim 1, characterized in that, Based on production data, dynamic production evaluation indicators are determined, including: Plot a curve with crude oil production on the x-axis and oil pressure on the y-axis to obtain an indicator curve; Calculate the slope of the indicator curve; The slope of the indicator curve is used as an indicator for evaluating production dynamics.

6. The method for evaluating the development effect and application potential of fishbone well completion according to claim 1, characterized in that, Based on the static evaluation indicators, well completion construction evaluation indicators, physical property evaluation indicators, and production dynamic evaluation indicators of the fishbone well completion to be evaluated, the development effect of the fishbone well completion is determined, including: The degree of fracture development and the longitudinal and transverse development characteristics of the reservoir type are set as the judgment criteria. The static evaluation indicators are judged to determine whether they meet the judgment criteria, and the geological improvement before and after the construction of the fishbone completion skeleton is obtained. Based on the comparison results between the preset threshold and the well completion construction evaluation index, the construction status of the fishbone well completion bone spikes to be evaluated is obtained. The historical physical property parameters of the fishbone completion to be evaluated before the construction of the bone spike are obtained, and the historical physical property parameters are compared with the physical property characteristic evaluation index to obtain the improvement of reservoir physical properties before and after the construction of the bone spike in the fishbone completion to be evaluated. Obtain the oil pressure and crude oil production of the fishbone completion to be evaluated before the construction of the fishbone spike, and evaluate the improvement of crude oil production before and after the construction of the fishbone completion based on the oil pressure and crude oil production before the construction of the fishbone spike and the production dynamic evaluation indicators. A comprehensive evaluation is conducted based on the geological improvement, reservoir property improvement, crude oil production improvement, and the construction of the fishbone completion spikes before and after the construction of the spikes, to obtain the development effect of the fishbone completion.

7. A device for evaluating the development effect and application potential of fishbone well completion, characterized in that, include: The acquisition unit is used to acquire the basic data of the fishbone well completion to be evaluated, including geological data, engineering data, well test data and production data; The index determination unit is used to determine, based on the acquired basic data, the static evaluation index, well completion construction evaluation index, physical property evaluation index, and production dynamic evaluation index for the fishbone well completion to be evaluated; the index determination unit includes: The first processing unit is used to determine static evaluation indicators based on geological data analysis; the geological data includes core samples and well logging data. The second processing unit is used to calculate and determine well completion construction evaluation indicators based on engineering data; wherein, the engineering data includes the actual protrusion length of each bone spike in the formation and the corresponding design length, and the well completion construction evaluation indicators include the ratio of the actual protrusion length of the bone spike in the formation to the corresponding design length. The third processing unit is used to determine the physical property evaluation indicators based on the analysis of well test data; The fourth processing unit is used to calculate and determine dynamic production evaluation indicators based on production data; among which, production data include oil pressure and crude oil production. The effect determination unit is used to determine the development effect of the fishbone well completion based on the static evaluation index, well completion construction evaluation index, physical property evaluation index and production dynamic evaluation index of the fishbone well to be evaluated. The prediction unit is used to predict the physical property characteristics of the comparison area based on the geological data, engineering data and production data of the comparison area, and to obtain the predicted physical property parameters of the comparison area; wherein, the comparison area is a region with the same type of fishbone completion reservoir as the one to be evaluated, and the development of the comparison area adopts non-fishbone construction. The evaluation unit is used to compare the physical property characteristics evaluation index of the fishbone completion to be evaluated with the predicted physical property parameters to obtain the evaluation result of the application potential of the fishbone completion.

8. The apparatus for evaluating the development effect and application potential of fishbone well completion according to claim 7, characterized in that, The first processing unit includes: The description unit is used to describe the core sample and obtain the reservoir type. The interpretation unit is used to interpret well logging data to obtain the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir. The first output unit is used to take sedimentary facies type, fracture development degree and reservoir longitudinal and transverse development characteristics as static evaluation indicators.

9. The apparatus for evaluating the development effect and application potential of fishbone well completion according to claim 7, characterized in that, The second processing unit includes: The first calculation unit is used to divide the actual protrusion length of each bone spike in the formation by the corresponding design length to obtain the ratio of each bone spike to the corresponding design length. The second calculation unit is used to obtain the average ratio of bone spurs to design length based on the ratio of all bone spurs to the corresponding design length in the fishbone completion to be evaluated. The second output unit is used to use the average ratio of bone spurs to the design length as an evaluation index for well completion construction.

10. The apparatus for evaluating the development effect and application potential of fishbone well completion according to claim 7, characterized in that, The third processing unit includes: The analysis unit is used to analyze well test data to obtain current physical property parameters; wherein, the current physical property parameters include one or more of the following: formation coefficient, productivity index, fracture half-length, equivalent seepage radius, equivalent permeability, and skin coefficient; The third output unit is used to use the current physical property parameters as evaluation indicators of physical property characteristics.

11. The apparatus for evaluating the development effect and application potential of fishbone well completion according to claim 7, characterized in that, The fourth processing unit includes: The plotting unit is used to create an indicator curve with crude oil production as the horizontal axis and oil pressure as the vertical axis. The third calculation unit is used to calculate the slope of the indicator curve; The fourth output unit is used to use the slope of the indicator curve as a production dynamic evaluation index.

12. The apparatus for evaluating the development effect and application potential of fishbone well completion according to claim 7, characterized in that, The effect determination unit includes: The first evaluation unit is used to set the degree of fracture development and the longitudinal and transverse development characteristics of the reservoir type as the judgment criteria to determine whether the static evaluation indicators meet the judgment criteria and to obtain the geological improvement before and after the construction of the fishbone well completion skeleton. The second evaluation unit is used to obtain the construction status of the fishbone well completion spurs to be evaluated based on the comparison results between the preset threshold and the well completion construction evaluation index. The third evaluation unit is used to obtain the historical physical property parameters of the fishbone completion to be evaluated before the construction of the bone spike, and compare the historical physical property parameters with the physical property characteristic evaluation index to obtain the improvement of reservoir physical properties before and after the construction of the bone spike in the fishbone completion to be evaluated. The fourth evaluation unit is used to obtain the oil pressure and crude oil production of the fishbone completion to be evaluated before the construction of the fishbone spike, and to evaluate and determine the improvement of crude oil production before and after the construction of the fishbone completion based on the oil pressure and crude oil production before the construction of the fishbone spike and the production dynamic evaluation indicators. The fifth evaluation unit is used to comprehensively evaluate the geological improvement, reservoir property improvement, crude oil production improvement, and construction status of the fishbone completion before and after the construction of the fishbone spike, and to obtain the development effect of the fishbone completion.

13. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores instructions for causing the machine to perform the method for evaluating the development effect and application potential of fishbone well completions as described in any one of claims 1-6.

14. A processor, characterized in that, Used to run a program, wherein the program is run to perform the method for evaluating the development effect and application potential of fishbone well completions as described in any one of claims 1-6.

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