Interwell sand body connectivity analysis method and system under large well spacing

Abstract

The invention relates to an inter-well sand body connectivity analysis method and system under a large well spacing, and belongs to the technical field of oil and gas development of large-well-spacing oil fields. The method comprises the steps that a development well pattern under the large well spacing is divided into a plurality of well groups; based on the production data, obtaining an inter-well sand body connectivity judgment result on a well plane in each well group; on the basis of the inter-well sand body connectivity judgment result on the plane, whether inter-well sand body connectivity analysis is ended or not is selected, and if not, the inter-well sand body connectivity judgment result on the inner section of each well group is obtained on the basis of production test data; and based on the inter-well sand body connectivity judgment result on the section, inter-well sand body connectivity analysis under the large well spacing is completed. According to the method, the inter-well sand body connectivity of the production well is analyzed from the aspects of production data and production test data, inter-well sand body distribution is restrained and depicted, and the oil reservoir flooding condition and the seepage barrier distribution mode in the reservoir are analyzed.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas development in large well spacing oil fields, and in particular relates to a method and system for analyzing connectivity of inter-well sand bodies under large well spacing. Background Art

[0002] Many oil fields that have been developed for a long time have gone through the development stages of initial water content, medium water content, high water content and ultra-high water content after years of water injection development. Their water content and recovery degree have reached a relatively high level and have entered the high water content stage as a whole. Therefore, under such conditions, if we want to further stabilize oil and control water in the oil field, we need to study the dynamic response of underground injection and production with water injection development, and combine geological characteristics to understand the dynamic laws of sand body plane production.

[0003] And with the continuous development of the oil industry, a large amount of practical experience in oil field development shows that in the long-term water injection development process of oil fields, the injected water has a variety of dynamic geological effects on the reservoir. As time goes by, the injected water not only displaces oil and gas, but also has a great impact on the physical properties, pore structure, heterogeneity and fluid properties of the reservoir, causing changes in the physical properties of the reservoir rock. When studying the connectivity of the sand body to be developed, it is necessary to understand the injection-production response, that is, the changes in production dynamics, and there are certain rules to follow.

[0004] The above problems have seriously restricted the exploration of remaining oil potential in oil fields with large well spacing, which are mainly developed by the coordinated development of vertical and horizontal wells. The connectivity of sand bodies between wells has become an increasingly hot and difficult research topic.

[0005] Sandbody connectivity interpretation is a comprehensive analysis method based on vertical and horizontal well logging response characteristics and comprehensive oil and gas field development dynamic data. With the continuous development of the petroleum industry, a large amount of practical experience in oilfield development has shown that during the long-term water injection development of oilfields, the injected water has a variety of dynamic geological effects on the reservoir. And when studying the connectivity of the developed sand bodies, it is necessary to understand the changes in production dynamics, but this change is not chaotic, and there are certain rules to follow.

[0006] The research methods of dynamic connectivity between wells are mainly divided into test method analysis and production dynamic data analysis. The test method analysis here refers to tracer monitoring technology, which has been widely used in the petroleum industry since the 1950s. Its working principle is to inject tracers into water injection wells and monitor the output of tracers in oil production wells to determine the connectivity between wells. When tracer monitoring technology is used in units of well groups, accurate and high-precision analysis results can be obtained. However, this technology has high cost and long test cycle, and it is difficult to use on a large scale under the conditions of multiple wells and large well spacing in the study area. Summary of the invention

[0007] In view of the above problems, the present invention provides a method and system for analyzing the connectivity of inter-well sand bodies under large well spacing, which comprehensively utilizes a large number of development dynamic data (production data and production test data) accumulated over a long period of time in the process of oil field development to analyze the connectivity of inter-well sand bodies in plane and profile under large well spacing, so as to adapt to the actual situation of fast phase change and complex connectivity state of inter-well sand bodies in large well spacing, make up for the lack of geological methods for using dynamic data to constrain geological characteristics to characterize inter-well connectivity in "double-high" oil fields, recognize the dynamic laws of planar production in the work area, and provide a reference for studying the laws of oil and water movement and predicting the distribution of remaining oil.

[0008] The first object of the present invention is to provide a method for analyzing the connectivity of sand bodies between wells under large well spacing, the method comprising:

[0009] Divide the development well pattern under large well spacing into several well groups;

[0010] Based on the production data, the inter-well sand body connectivity judgment results on the well plane within each well group are obtained;

[0011] Based on the inter-well sand body connectivity judgment results on the plane, choose whether to end the inter-well sand body connectivity analysis:

[0012] If not, based on the production test data, the inter-well sand body connectivity judgment results on the internal profile of each well group are obtained;

[0013] Based on the inter-well sand body connectivity judgment results on the profile, the inter-well sand body connectivity analysis under large well spacing is completed.

[0014] In certain embodiments of the present invention, the well group is divided into a group with the water injection well as the center and the oil production wells in a line around the water injection well as the center.

[0015] In certain embodiments of the present invention, the production data includes formation pressure test data, daily injection volume of water injection wells, water breakthrough time and dynamic liquid level test results, and water content, daily oil production and daily liquid production of oil production wells.

[0016] In certain embodiments of the present invention, the determination result of the connectivity of sand bodies between wells on the well plane in each well group based on the production data includes:

[0017] Determine whether the formation pressure test data is consistent over time;

[0018] According to the consistency judgment results, choose whether to end the inter-well sand body connectivity analysis:

[0019] If not, the well-to-well injection-production response judgment result is obtained based on the daily injection volume of the water injection well and the water content, daily oil production and daily liquid production of the oil production well;

[0020] According to the well-to-well injection-production response judgment results, choose whether to end the inter-well sand body connectivity analysis:

[0021] If not, determine the time type of water injection wells to see water and take effect;

[0022] According to the judgment result of water breakthrough time type, choose whether to end the inter-well sand body connectivity analysis:

[0023] If not, based on the dynamic liquid level test results of the injection wells, the inter-well sand body connectivity judgment results on the well plane within each well group are obtained.

[0024] In certain embodiments of the present invention, the step of selecting whether to end the inter-well sand body connectivity analysis according to the consistency judgment result includes:

[0025] The consistency judgment result is inconsistent, and the sand body connectivity analysis between wells is terminated, wherein the result of the sand body connectivity analysis between wells corresponds to the lack of connectivity between wells;

[0026] The consistency judgment result is consistent, select No to end the inter-well sand body connectivity analysis.

[0027] In certain embodiments of the present invention, the step of selecting whether to terminate the inter-well sand body connectivity analysis according to the well-to-well injection-production response judgment result includes:

[0028] The result of the well-to-well injection-production response judgment is that the well-to-well injection-production response is inconsistent, and the sand body connectivity analysis between wells is terminated, wherein the result of the sand body connectivity analysis between wells corresponds to that there is no connectivity between wells;

[0029] The well-to-well injection-production response judgment result is that the well-to-well injection-production response is consistent, and select No to end the inter-well sand body connectivity analysis.

[0030] In certain embodiments of the present invention, the determination result of the water breakthrough time type, and the selection of whether to end the inter-well sand body connectivity analysis, include:

[0031] The judgment result of the water breakthrough time type is not the first type, and the sand body connectivity analysis between wells is terminated, wherein the result of the sand body connectivity analysis between wells corresponds to that the wells are not connected;

[0032] The judgment result of the water breakthrough time type is the first type, and select No to end the inter-well sand body connectivity analysis.

[0033] In certain embodiments of the present invention, the determination result of the connectivity of the sand bodies between wells on the well plane in each well group is obtained based on the dynamic liquid level test result of the water injection well, including:

[0034] The dynamic liquid level test result of the water injection well showed that the dynamic liquid level of the oil production well did not rise after water injection, indicating that there was no connectivity between the wells.

[0035] The dynamic liquid level test result of the water injection well is that after water injection, the dynamic liquid level of the oil production well rises, and the judgment result of the connectivity of the sand bodies between wells on the well plane within each well group is obtained.

[0036] In certain embodiments of the present invention, the step of selecting whether to terminate the inter-well sand body connectivity analysis based on the inter-well sand body connectivity judgment result on the profile includes:

[0037] The inter-well sand body connectivity judgment result on the profile is a disconnected judgment result, and the inter-well sand body connectivity analysis is terminated;

[0038] The inter-well sand body connectivity judgment result on the profile is a connected judgment result. Select No to end the inter-well sand body connectivity analysis.

[0039] In certain embodiments of the present invention, the production test data includes inter-well tracer monitoring data and production and absorption profile analysis data.

[0040] In certain embodiments of the present invention, the determination result of the connectivity of the sand bodies between wells on the cross section of each well group based on the production test data includes:

[0041] Based on the inter-well tracer monitoring data, the inter-well sand body connectivity judgment results on the profile of each well group are obtained;

[0042] and / or,

[0043] Based on the production and absorption profile analysis data, the inter-well sand body connectivity judgment results on the profile within each well group are obtained.

[0044] In some embodiments of the present invention, it further comprises:

[0045] Combine the inter-well sand body connectivity judgment results on the profile with static data;

[0046] Based on the combined results, the connectivity analysis of inter-well sand bodies at large well spacing was completed.

[0047] The second object of the present invention is to provide an inter-well sand body connectivity analysis system under large well spacing, the analysis system comprising:

[0048] The division module is used to divide the development well network under large well spacing into several well groups;

[0049] The plane model is used to obtain the inter-well sand body connectivity judgment results on the well plane within each well group based on production data;

[0050] The selection module is used to select whether to end the inter-well sand body connectivity analysis based on the inter-well sand body connectivity judgment results on the plane:

[0051] The execution model is used to determine the connectivity of the sand bodies between wells on the cross-section of each well group based on the production test data.

[0052] The profile module is used to complete the inter-well sand body connectivity analysis under large well spacing based on the inter-well sand body connectivity judgment results on the profile.

[0053] A third object of the present invention is to provide an electronic device, the electronic device comprising: a processor, the processor being coupled to a memory;

[0054] The memory is used to store computer programs;

[0055] The processor is used to execute the computer program stored in the memory, so that the electronic device executes the method in the above embodiment.

[0056] A fourth object of the present invention is to provide a computer-readable storage medium, wherein the computer-readable storage medium stores a program or instruction, and when the program or instruction is executed on a computer, the computer executes the method in the above embodiment.

[0057] Beneficial effects of the present invention:

[0058] The present invention provides a method and system for analyzing the connectivity of inter-well sand bodies under large well spacing, which analyzes the connectivity of inter-well sand bodies of production wells from the aspects of production data and production test data (pressure change, production curve, production and absorption profile, tracer, production interference, etc.), constrains and characterizes the distribution of inter-well sand bodies, analyzes the flooding status of the oil reservoir, and the distribution pattern of seepage barriers in the reservoir;

[0059] Furthermore, by combining the above data analysis results with geological research, the dynamic analysis results constrain the geological static analysis results, so as to obtain more accurate inter-well sand body connectivity analysis results;

[0060] The present invention uses conventional logging data and production dynamic data to study the connectivity of the sand bodies in the study area, so as to solve the problem that when an oil field developed under a large well spacing and well network enters the "double high" stage after a long period of development, a further understanding of the underground sand bodies and the distribution of residual oil is needed. However, due to the influence of offshore environmental factors, the characterization and research of the reservoir sand bodies have relatively little data available, making it difficult to characterize them in detail.

[0061] The present invention finally completes the evaluation and prediction of the connectivity of the reservoir sand body in the research area, and provides a strong basis for predicting the distribution of remaining oil in the oil field and adjusting and optimizing the well network.

[0062] The present invention utilizes development dynamic data to constrain geological characteristics to characterize the research on sand body connectivity, and provides a development plan design basis for stabilizing and increasing production of oil and gas fields developed at large well spacing.

[0063] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0065] Figure 1 A flow chart showing a method for analyzing inter-well sand body connectivity under large well spacing according to an embodiment of the present invention is shown;

[0066] Figure 2 A production performance curve diagram of well A and well B in well group A according to an embodiment of the present invention is shown;

[0067] Figure 3 A production performance curve diagram of well A in well group A according to an embodiment of the present invention is shown;

[0068] Figure 4 A production performance curve diagram of well B in well group A according to an embodiment of the present invention is shown;

[0069] Figure 5 It shows the tracer monitoring data and analysis result diagram of the A well group according to an embodiment of the present invention;

[0070] Figure 6 A diagram showing the results of the C well fluid production profile analysis according to an embodiment of the present invention is shown;

[0071] Figure 7 The result diagram of the water absorption profile analysis of the A well water injection well according to the embodiment of the present invention is shown;

[0072] Figure 8 The sand body well-connection profile under the dynamic constraint of the A well group according to an embodiment of the present invention is shown;

[0073] Fig. 9 A framework diagram of a method for analyzing inter-well sand body connectivity under large well spacing according to an embodiment of the present invention is shown;

[0074] Fig.10 A framework diagram of an electronic device according to an embodiment of the present invention is shown;

[0075] In the figure:

[0076] Division module 1; plane module 2; selection module 3; execution module 4; profile module 5; electronic device 300, processor 301, memory 302. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0078] like Figure 1 As shown, a method for analyzing inter-well sand body connectivity under a large well spacing according to an embodiment of the present invention includes:

[0079] Step S1, dividing the development well pattern with large well spacing into several well groups;

[0080] Step S2, based on the production data, obtaining the inter-well sand body connectivity judgment result on the well plane in each well group;

[0081] Step S3: Based on the inter-well sand body connectivity judgment result on the plane, select whether to end the inter-well sand body connectivity analysis:

[0082] Step S31: If not, based on the production test data, obtain the inter-well sand body connectivity judgment result on the cross section of each well group;

[0083] Step S4: Based on the inter-well sand body connectivity judgment result on the profile, the inter-well sand body connectivity analysis under the large well spacing is completed.

[0084] In the embodiment of the present invention, the large well spacing well pattern oilfield development research of a certain oilfield in the Bohai Sea in the Yellow River Mouth Depression is carried out, the sand bodies No. 1, No. 2 and No. 3 of the reservoir are interpreted, and the sand body connectivity relationship is established;

[0085] Basic information of the study area:

[0086] The oilfield sandstone in the study area is a typical shallow delta deposit, with stable water bodies and long-term stable geomorphological forms. It has structures such as quasi-heart bar, distributary channel, inter-distributary channel and lake mud. Their respective characteristics are: quasi-heart bar: the quasi-heart bar is the skeleton sand body of the delta, with large sand body deposition thickness, relatively wide plane distribution and good continuity. The well logging curve is mainly box-shaped and composite box-shaped. The amplitude of the seismic phase waveform is obvious. Distributary channel: In the delta sedimentary system, not the entire distributary channel is a favorable part for the development of sand bodies. It is mainly a channel for water flow and sand body transportation. The thickness of the river channel sand body deposition is less than 5 meters, and the well logging curve is bell-shaped or boot-shaped. Inter-distributary channel: The lake bay formed by the water body between the distributary channels, the sediments are mainly gray-green mudstone, containing thin layers of fine sand deposited during the flood period. The bedding structure is mainly horizontal bedding, which is developed vertically on the former shallow delta mudstone or shallow delta front sand body. Due to the low content of sandstone and fine lithology, the natural potential and natural gamma curve are low. Lacustrine mud: Sand bodies are not developed, mainly reduced-color mud deposits, and the natural potential and natural gamma curve are low.

[0087] In step S1, the development well network with large well spacing is divided into several well groups. Specifically, according to the position relationship between the water injection wells and the oil production wells, the well groups are divided in a manner of including the surrounding oil production wells in a line with the water injection well as the center. In the embodiment of the present invention, the well network with large well spacing in the area is exemplarily divided into 18 groups;

[0088] In step S2, based on the production data, the inter-well sand body connectivity judgment result on the well plane in each well group is obtained, including:

[0089] Step A1, determining whether the formation pressure test data is consistent with time;

[0090] Step A2: Choose whether to end the inter-well sand body connectivity analysis based on the consistency judgment result:

[0091] Step A21, if not, based on the daily injection volume of the water injection well and the water content, daily oil production and daily liquid production of the oil production well, obtain the well-well injection-production response judgment result;

[0092] Step A3: According to the well-to-well injection-production response judgment result, choose whether to end the inter-well sand body connectivity analysis:

[0093] Step A31: If not, determine the water-seeking and effective time type of the water injection well;

[0094] Step A4: Choose whether to end the inter-well sand body connectivity analysis based on the judgment result of the water breakthrough time type:

[0095] Step A41: If not, based on the dynamic liquid level test results of the water injection wells, obtain the inter-well sand body connectivity judgment results on the well plane in each well group.

[0096] Among them, production data include formation pressure test data, daily injection volume of water injection wells, water breakthrough time and dynamic liquid level test results, and water content, daily oil production and daily liquid production of oil production wells.

[0097] Specifically, on the basis of step S1, the wells divided into groups are analyzed one by one. Taking the analysis of the first group of wells as an example, the operation of step A1 in step S2 is first performed, that is, judging whether the formation pressure test data is consistent with time, which is:

[0098] Under the original conditions of the formation, the pressures at various locations in the same pressure system should be balanced. After the reservoir is put into development, if the reservoir sand bodies are connected and in the same flow unit, as the oil field production wells are continuously developed, the formation will experience pressure exhaustion, recovery, and overpressure. If they belong to different flow units and pressure systems, the well will not be affected by the development of surrounding production wells, and the formation pressure will be relatively stable, or there will be no corresponding regular changes in formation pressure;

[0099] Therefore, the result of judging whether the formation pressure test data is consistent over time is:

[0100] The consistency judgment result is inconsistent, and the corresponding formation pressure test data changes steadily over time or shows formation pressure changes without corresponding rules;

[0101] or,

[0102] The consistency judgment result is consistent, which means that the corresponding formation pressure test data shows exhaustion, recovery and overpressure phenomena over time;

[0103] In step A2, the step of selecting whether to end the inter-well sand body connectivity analysis according to the consistency judgment result includes:

[0104] The consistency judgment result is inconsistent, and the sand body connectivity analysis between wells is terminated. The result of the sand body connectivity analysis between wells corresponds to the lack of connectivity between wells, that is, step A2 is terminated, the connectivity analysis between two wells in the first group of wells is completed, and the connectivity analysis between other wells in the first group of wells is selected, and step A1 is repeated;

[0105] If the consistency judgment result is consistent, select No to end the inter-well sand body connectivity analysis, that is, enter step A21;

[0106] That is, based on the daily injection volume of the water injection well and the water content, daily oil production and daily liquid production of the oil production well, the well-well injection-production response judgment result is obtained, specifically:

[0107] The daily injection volume of the water injection well is obtained from the daily injection volume curve of the water injection well (which is production data), and based on this parameter, the monthly cumulative injection volume of the water injection well is obtained;

[0108] The water content, daily oil production and daily liquid production of the oil production well are obtained from the water content, daily oil production and daily liquid production curves of the oil production well (production data). Based on the above three parameters, the monthly cumulative liquid production and monthly cumulative oil production can be obtained;

[0109] Well-to-well injection-production response judgment is that the oil production characteristics of the oil production well can respond to the changes in the water injection characteristics of the water injection well, wherein the water injection characteristics of the water injection well refer to the classification of the water injection well production curve into different types according to the daily injection volume curve characteristics of the water injection well, and different water injection curve types represent different water injection policies and reflect the characteristics of different water injection wells; the oil production characteristics of the oil production well refer to the classification of the production curve of the oil production well into different types according to the different characteristics of the water content, daily oil production and daily liquid production curves of the oil production well, reflecting the oil production characteristics of different oil production wells;

[0110] To improve understanding, for example, if the monthly cumulative oil production of the oil production well is equal to the monthly cumulative injection volume of the water injection well, the daily oil production curve characteristics of the oil production well (the characteristics here refer to the rise, fall, peak position, etc. of the curve) respond to the characteristics of the daily injection volume curve of the water injection well, which means that the well-to-well injection-production response judgment result is consistent between the well-to-well injection-production responses;

[0111] Otherwise, the well-to-well injection-production response judgment result is that the well-to-well injection-production response is inconsistent;

[0112] After obtaining the well-to-well injection-production response judgment result, step A3 is entered to select whether to end the inter-well sand body connectivity analysis according to the well-to-well injection-production response judgment result, including:

[0113] The result of the well-to-well injection-production response judgment is that the well-to-well injection-production response is inconsistent, and the well-to-well sand body connectivity analysis is terminated. The result of the well-to-well sand body connectivity analysis corresponds to that the wells have no connectivity, that is, step A3 is terminated, the connectivity analysis between two wells in the first group of wells is completed, and the connectivity analysis between other wells in the first group of wells is selected, and step A1 is repeated;

[0114] The well-to-well injection-production response judgment result is that the well-to-well injection-production response is consistent, and a selection of "No" is made to end the inter-well sand body connectivity analysis, that is, to enter step 31 .

[0115] Specifically, in step A31, the water emergence and effectiveness time type of the water injection well is determined as follows:

[0116] Water-seeking and effective time refers to water-seeking time and effective time, which are two important parameters of water injection effect. Water-seeking and effective time types refer to two types divided according to the quality of water injection effect, namely, first type and non-first type. The water-seeking and effective time of the first type both reflect good water injection effect, while the water-seeking and effective time of the non-first type both reflect poor water injection effect.

[0117] Therefore, the judgment result of the water-seeking and effective time type is:

[0118] The result of the judgment of the time type of water effect is not the first type;

[0119] or,

[0120] The judgment result of the time type for water to take effect is the first type.

[0121] The quality of water injection effect can directly reflect the connectivity between wells. Therefore, in step A4, according to the judgment result of the water breakthrough time type, it is selected whether to end the sand body connectivity analysis between wells, specifically:

[0122] If the result of the water breakthrough time type is not the first type, the sand body connectivity analysis between wells is terminated, wherein the result of the sand body connectivity analysis between wells corresponds to the lack of connectivity between wells, that is, step A4 is terminated, the connectivity analysis between two wells in the first group of wells is completed, and the connectivity analysis between other wells in the first group of wells is selected, and step A1 is repeated;

[0123] If the water breakthrough time type is the first type, select No to end the inter-well sand body connectivity analysis, i.e., step A41.

[0124] Specifically, in step A41, the inter-well sand body connectivity judgment result on the well plane in each well group is obtained based on the dynamic liquid level test result of the water injection well, including:

[0125] The result of the dynamic liquid level test of the water injection well is that the dynamic liquid level of the oil production well does not rise after water injection, indicating that there is no connectivity between the wells, that is, step A41 is terminated, the connectivity analysis between the two wells in the first group of wells is completed, and the connectivity analysis between the other wells in the first group of wells is selected, and step A1 is repeated;

[0126] The dynamic liquid level test result of the water injection well is that after water injection, the dynamic liquid level of the oil production well rises, and the judgment result of the connectivity of the sand bodies between wells on the well plane within each well group is obtained.

[0127] After completing step A41, the determination of the connectivity of the sand bodies between the wells in the first group of wells on the plane is completed. Then, according to the determination result of the connectivity of the sand bodies between the wells on the plane, it is selected whether to end the sand body connectivity analysis between the wells, that is, the determination operation of step S3 is performed;

[0128] On the basis of step S2, the judgment result of the inter-well sand body connectivity on the well plane in each well group is obtained, that is, the operation proceeds to step S31;

[0129] Specifically, in step S31, the inter-well sand body connectivity judgment result on the cross section of each well group is obtained based on the production test data, including:

[0130] Based on the inter-well tracer monitoring data, the inter-well sand body connectivity judgment results on the profile of each well group are obtained;

[0131] and / or,

[0132] Based on the production and absorption profile analysis data, the inter-well sand body connectivity judgment results on the profile within each well group are obtained;

[0133] The production test data include inter-well tracer monitoring data and production and absorption profile analysis data.

[0134] In the actual well connectivity analysis, based on the content of the existing production test data of the two wells to be judged, the following are selected:

[0135] Based on the inter-well tracer monitoring data, the inter-well sand body connectivity judgment results on the profile of each well group are obtained;

[0136] and / or,

[0137] Based on the production and absorption profile analysis data, the inter-well sand body connectivity judgment results on the profile within each well group are obtained;

[0138] That is, the existing production test data only includes inter-well tracer monitoring data, and judgment can be made based on the inter-well tracer monitoring data. The existing production test data only includes production and absorption profile analysis data, and judgment can be made based on the production and absorption profile analysis data. The existing production test data includes both inter-well tracer monitoring data and production and absorption profile analysis data. When making judgments, one of the two can be selected, or both can be analyzed and judged, so as to save the analysis and judgment costs and be fast.

[0139] If the existing production test data does not include inter-well tracer monitoring data and production and absorption profile analysis data, real-time testing can be performed to obtain the above production test data.

[0140] The inter-well tracer monitoring data is used to determine the connectivity of the inter-well sand bodies on the cross-section of each well group, as follows:

[0141] The inter-well tracer monitoring data include the direction, movement law, and distribution of the injected fluid (including the tracer) in the plane and in the vertical direction. These data can reveal the heterogeneity of the reservoir and the connectivity between the wells.

[0142] To improve understanding, for example, if a tracer is dropped into the H layer in one well and a tracer is detected in the H layer in another well, it means that the sand bodies between the wells on the profile are connected; if no tracer is detected in the H layer in the other well, it means that the sand bodies between the wells on the profile are not connected.

[0143] Based on the production and absorption profile analysis data, the inter-well sand body connectivity judgment result on the profile within each well group is obtained as follows:

[0144] The production and absorption profile analysis data (layer position, water absorption thickness, small layer water absorption and water absorption intensity, etc.) can be used to understand the vertical distribution and change trend of the injected water in the reservoir, constrain the characterization of the sand body in geology, that is, to obtain the judgment of the connectivity of the sand body between wells on the profile;

[0145] To improve comprehension, for example, in the production and absorption profile analysis data between wells, if the water absorption thickness, water absorption amount and water absorption intensity of the water injection wells in the corresponding layer are consistent with the liquid production and oil production data of the oil production wells in nearly the same period, then the sand bodies between the wells on the profile are connected; otherwise, the sand bodies between the wells on the profile are not connected.

[0146] According to the above steps, the analysis of the connectivity of the sand bodies between wells in the plane and in the section of all wells in the first group of wells is completed, and then steps S2 to S31 are repeated to complete the analysis of the connectivity of the sand bodies between wells in the remaining groups of wells, until the analysis of the connectivity of all sand bodies between wells in the development well network with a large well spacing is completed, and a connectivity diagram of the development well network with a large well spacing is formed, that is, step S4, based on the judgment result of the connectivity of the sand bodies between wells on the section, the connectivity analysis of the sand bodies between wells with a large well spacing is completed.

[0147] In certain embodiments of the present invention, in order to prevent errors in data analysis and improve the accuracy of the connectivity analysis of the development well pattern with large well spacing obtained above, the connectivity analysis method of the development well pattern with large well spacing also includes:

[0148] Combine the inter-well sand body connectivity judgment results on the profile with static data, wherein the static data includes sedimentary phase and sand body distribution data, which belongs to the geological analysis data of the development stage and can provide feedback on sand body connectivity;

[0149] The inter-well sand body connectivity judgment result and the static data on the combined section are compared with the conclusion of the inter-well sand body connectivity determined by the data analysis in the above step (hereinafter referred to as the analysis conclusion) and the data of the inter-well sand body connectivity revealed in the static data (hereinafter referred to as the geological conclusion);

[0150] like:

[0151] ① The analysis conclusion is that the sand bodies between wells are connected on the plane, but not on the section;

[0152] In the geological conclusions of the same well location and the same period, the sand bodies between wells are connected in the plane and in the section;

[0153] Then modify the connectivity results of the inter-well sand bodies in the analysis conclusions so that the analysis conclusions are consistent with the geological conclusions;

[0154] ② The analysis conclusion is that the sand bodies between wells are connected on the plane and on the section;

[0155] In the geological conclusions of the same period at the same well location, the sand bodies between wells on the plane are connected, but the sand bodies between wells on the section are not connected; or, the sand bodies between wells on the plane are not connected, but the sand bodies between wells on the section are not connected;

[0156] The connectivity results of the inter-well sand bodies in the analysis conclusion are retained.

[0157] Based on the above combined results, the connectivity analysis of inter-well sand bodies under large well spacing was completed, and a new connectivity map of the development well network under large well spacing was formed.

[0158] For better understanding, in the embodiment of the present invention, taking a large well spacing well pattern oil field in a Bohai oil field in the Yellow River Mouth Depression as an example, some results of the above analysis process are exemplarily shown, as follows:

[0159] Figure 2The results of the static pressure test data analysis of each well in the A well group on the No. 1 sand body are shown. Starting from the well group, the principle of local proximity is adopted. By observing whether the formation pressure test data of the two wells have consistency over time, the reservoir connectivity can be directly reflected. If it is judged to be connected, the production characteristics can be further compared and verified. For example, Well B is a vertical well production well with a long development time in the A well group, and both wells are shot in the A sand body. During the second stop injection period of Well A, the pressure of Well B was significantly and rapidly depleted. After the injection well was re-injected, the formation pressure recovered. It can be seen that the two wells may have a good connection relationship in the A sand body. Well J, Well D and Well E are horizontal oil production wells in the A well group, all of which are produced and developed inside the A sand body. When Well J was re-injected for the first time, there was no obvious recovery or increase in the formation pressure, but it was depleted. Therefore, it is believed that there may be no connection between Well J and Well A. The four test data of Well D are relatively stable, and there is no significant change before and after the first injection of Well A. Therefore, it is also believed that Well D and Well A may have no connection. After the first injection of Well A, the formation pressure of Well E recovered significantly and tended to be stable and exhausted. After the second injection of the water well, there was also a corresponding formation pressure recovery response. Therefore, it is inferred that there is a good connection between Well E and Well A. Well B was put into production earlier than Well E, and the first pressure measurement data of Well E after production was slightly lower than the first pressure measurement data of Well B after production. Therefore, in the A well group, except for Well C, which has too little pressure measurement data to be judged, it can be preliminarily inferred that only Well A, Well E, and Well B are in the same pressure system among the remaining wells in the well group, and they have a good connection with each other.

[0160] Figure 3 The production performance curve of well A in well group A is shown. Figure 4 The production dynamic curve of Well B is shown. In oilfield development, due to the heavy production tasks, each well cannot be pressure tested in time. Therefore, the production interference analysis method is also one of the important means to determine the connectivity of sand bodies between wells. The so-called production interference analysis method is to use adjacent wells as basic units, and based on the production changes of single wells (new wells put into production, nozzle changes, well shutdown, etc.), track whether the adjacent wells have received interference information, and the changes in dynamic information such as oil pressure, production, and water content, so as to infer the connectivity relationship between wells.

[0161] Similarly, in the A well group, Well A, Well C and Well B were all shot in the sand bodies of No. 1 and No. 2. However, the water injection changes and well shutdown measures of A did not cause relevant responses to the dynamic information of Well C, and no interference information occurred. It can be inferred that there may be a seepage barrier between Well A and Well C, and the connectivity is poor.

[0162] Since Well B was put into production in 2009, it has been significantly affected by the water injection volume of Well A. The water injection volume of Well A increased at the end of 2009 and the end of 2013, and the water content of Well B showed a rapid increase in response, with obvious well interference information. It is inferred that Well B has a good connection with Well A, which supports the well connectivity characteristics of its formation test pressure change.

[0163] Well-to-well interference sometimes has the problem of weak response and multiple solutions when judging the connectivity of sand bodies. For example, the water content of Well E was low from the time it was put into production in 2011 to the end of 2012, and it had a good interference information response with the shutdown of the A injection well. However, from 2014 to 2016, with the increase in the injection allocation and injection volume of the injection wells, the water content of the horizontal production wells showed a gradual downward trend. The reason may be that the well-to-well interference information is weak, or it is affected by the decrease in injection volume of other surrounding injection wells. Therefore, the analysis of well-to-well interference information has the characteristics of multiple solutions, and it is necessary to combine other dynamic responses to analyze and judge the connectivity of the sand bodies.

[0164] Figure 5 The tracer monitoring data and analysis results of the A well group are shown; inter-well tracer monitoring is the most intuitive and effective method to understand reservoir heterogeneity and inter-well connectivity by observing the direction, movement law, and distribution of the injected fluid in the plane and vertical direction. In the A well group, by injecting tracer 2,3,4,5-tetrafluorobenzoic acid into the No. 1 sand body layer of well A, and injecting tracer BHSZ-01 into the No. 2 and No. 3 sand bodies (combined production), and monitoring the effect of the agent in each production layer of the surrounding wells, the results obtained reflect the same conclusions as the formation pressure test analysis and the inter-well interference information analysis and judgment, and can further understand the inter-well connected layers, such as Well A and Well B are connected at the No. 1 sand body layer, and the connectivity relationship at the No. 2 and No. 3 sand body layers is poor, which means that Well A and Well B are connected at the No. 1 sand body layer on the section;

[0165] Figure 6 The following figure shows the analysis results of the fluid production profile of Well C. Figure 7The figure shows the analysis result of water absorption profile of injection well A; in oilfield development, tracer monitoring data is often less, so in addition to tracer data, the production and absorption profile analysis method can also be used to determine the connectivity between the layers in the well group. The production and absorption profile analysis method is to determine the dominant water absorption and liquid production layers of the reservoir based on the data of liquid production and water absorption tests. At the same time, the timeliness of water injection and the time lag of water injection response must also be considered. Therefore, the water absorption profile of the injection well closest to the production well liquid production test time and earlier than the test time is selected, and combined with the perforation data, the inter-well connected layer analysis is carried out. First of all, according to the analysis of the production and absorption profile of the well group A, it can be seen that the dominant water absorption layers of Well A are sand bodies No. 1, No. 2, and No. 3, and the water absorption advantage of sand body No. 1 is the most obvious. The dominant fluid production of Well C is also sand body No. 0. The fluid production profile of Well C clearly shows that the fluid production of sand bodies No. 1 and No. 2 is very low, which is inconsistent with the characteristics of Well A, which has No. 1 and No. 2 sand bodies as the dominant water-absorbing layers. Therefore, it is confirmed that there is no dominant injected water migration channel between Well C and Well A on sand bodies No. 1 and No. 2, which is consistent with the results of previous data analysis.

[0166] Figure 8 The figure shows the sand body well-connected section under the dynamic constraints of well group A. Figure 8 It can be seen that in the No. 1 sand body, the connection between Well A and Well B is strong, while Well A and Well C are not connected. The three inter-well sandstones in the No. 2 sand body are not connected. The water injection well A in the No. 3 sand body is weakly connected with the two oil production wells, Well B and Well C. When using dynamic methods to analyze inter-well reservoir connectivity, there are often reasons such as weak inter-well dynamic response and multiple solutions (such as interference well test, production and absorption profile analysis), and lack of data (such as formation pressure testing). It is necessary to analyze various dynamic data of the well group comprehensively so that the analysis results of various dynamic response data can be mutually verified. Finally, the various dynamic data of the well group are analyzed comprehensively so that the analysis results of various dynamic response data can be mutually verified. Thus, the reservoir sand body connectivity relationship on the plane and profile of the work area is obtained.

[0167] like Fig. 9 As shown, in an embodiment of the present invention, a well-to-well sand body connectivity analysis system under a large well spacing is provided, and the analysis system comprises:

[0168] The division module 1 is used to divide the development well network under large well spacing into several well groups;

[0169] Plane Model 2 is used to obtain the inter-well sand body connectivity judgment results on the well plane within each well group based on production data;

[0170] Selection module 3 is used to select whether to end the inter-well sand body connectivity analysis based on the inter-well sand body connectivity judgment result on the plane:

[0171] Execution module 4 is used to obtain the inter-well sand body connectivity judgment result on the cross section of each well group based on the production test data if no;

[0172] The profile module 5 is used to complete the inter-well sand body connectivity analysis under large well spacing based on the inter-well sand body connectivity judgment result on the profile.

[0173] In an embodiment of the present invention, an electronic device is provided, the electronic device comprising: a processor, the processor being coupled to a memory;

[0174] The memory is used to store computer programs;

[0175] The processor is used to execute the computer program stored in the memory, so that the electronic device executes the determination method in the above embodiment.

[0176] like Fig.10 As shown, in some embodiments of the present invention, an electronic device 300 is provided, comprising: a processor 301, wherein the processor 301 is coupled to a memory 302;

[0177] The memory 302 is used to store computer programs;

[0178] The processor 301 is used to execute the computer program stored in the memory, so that the electronic device executes the determination method in the above embodiment.

[0179] In some embodiments of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a program or instruction. When the program or instruction is executed on a computer, the computer executes the method described in the above embodiments.

[0180] According to an embodiment of the present invention, the computer-readable storage medium may be a non-volatile computer-readable computer-readable storage medium, for example, may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, an electronic device or a device.

[0181] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for analyzing the connectivity of inter-well sand bodies under large well spacing, characterized in that: include: Divide the development well pattern under large well spacing into several well groups; Based on the production data, the inter-well sand body connectivity judgment results on the well plane within each well group are obtained; Based on the inter-well sand body connectivity judgment results on the plane, choose whether to end the inter-well sand body connectivity analysis: If not, based on the production test data, the inter-well sand body connectivity judgment results on the internal profile of each well group are obtained; Based on the inter-well sand body connectivity judgment results on the profile, the inter-well sand body connectivity analysis under large well spacing is completed.

2. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 1, characterized in that: The well group is divided into a group with the water injection well as the center and the oil production wells in the periphery of the water injection well as the wells.

3. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 1, characterized in that: The production data include formation pressure test data, daily injection volume of water injection wells, water breakthrough time and dynamic liquid level test results, and water content, daily oil production and daily liquid production of oil production wells.

4. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 3 is characterized in that: The inter-well sand body connectivity judgment result on the well plane in each well group based on the production data includes: Determine whether the formation pressure test data is consistent over time; According to the consistency judgment results, choose whether to end the inter-well sand body connectivity analysis: If not, the well-to-well injection-production response judgment result is obtained based on the daily injection volume of the water injection well and the water content, daily oil production and daily liquid production of the oil production well; According to the well-to-well injection-production response judgment results, choose whether to end the inter-well sand body connectivity analysis: If not, determine the time type of water injection wells to see water and take effect; According to the judgment result of water breakthrough time type, choose whether to end the inter-well sand body connectivity analysis: If not, based on the dynamic liquid level test results of the injection wells, the inter-well sand body connectivity judgment results on the well plane within each well group are obtained.

5. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 4, characterized in that: The step of selecting whether to end the inter-well sand body connectivity analysis according to the consistency judgment result includes: The consistency judgment result is inconsistent, and the sand body connectivity analysis between wells is terminated, wherein the result of the sand body connectivity analysis between wells corresponds to the lack of connectivity between wells; The consistency judgment result is consistent, select No to end the inter-well sand body connectivity analysis.

6. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 4, characterized in that: The step of selecting whether to terminate the inter-well sand body connectivity analysis according to the well-to-well injection-production response judgment result includes: The result of the well-to-well injection-production response judgment is that the well-to-well injection-production response is inconsistent, and the sand body connectivity analysis between wells is terminated, wherein the result of the sand body connectivity analysis between wells corresponds to that there is no connectivity between wells; The well-to-well injection-production response judgment result is that the well-to-well injection-production response is consistent, and select No to end the inter-well sand body connectivity analysis.

7. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 4, characterized in that: The judgment result of the water breakthrough time type and the selection of whether to end the inter-well sand body connectivity analysis include: The judgment result of the water breakthrough time type is not the first type, and the sand body connectivity analysis between wells is terminated, wherein the result of the sand body connectivity analysis between wells corresponds to that the wells are not connected; The judgment result of the water breakthrough time type is the first type, and select No to end the inter-well sand body connectivity analysis.

8. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 4, characterized in that: The dynamic liquid level test results of the water injection wells are used to obtain the inter-well sand body connectivity judgment results on the well plane in each well group, including: The dynamic liquid level test result of the water injection well showed that the dynamic liquid level of the oil production well did not rise after water injection, indicating that there was no connectivity between the wells. The dynamic liquid level test result of the water injection well is that after water injection, the dynamic liquid level of the oil production well rises, and the judgment result of the connectivity of the sand bodies between wells on the well plane within each well group is obtained.

9. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 8, characterized in that: The step of selecting whether to end the inter-well sand body connectivity analysis based on the inter-well sand body connectivity judgment result on the profile includes: The inter-well sand body connectivity judgment result on the profile is a disconnected judgment result, and the inter-well sand body connectivity analysis is terminated; The inter-well sand body connectivity judgment result on the profile is a connected judgment result. Select No to end the inter-well sand body connectivity analysis.

10. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 1, characterized in that: The production test data includes inter-well tracer monitoring data and production and absorption profile analysis data.

11. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 10, characterized in that: The inter-well sand body connectivity judgment results on the cross-section of each well group are obtained based on the production test data, including: Based on the inter-well tracer monitoring data, the inter-well sand body connectivity judgment results on the profile of each well group are obtained; and / or, Based on the production and absorption profile analysis data, the inter-well sand body connectivity judgment results on the profile within each well group are obtained.

12. The method for analyzing inter-well sand body connectivity under large well spacing according to any one of claims 1 to 11, characterized in that: Also includes: Combine the inter-well sand body connectivity judgment results on the profile with static data; Based on the combined results, the connectivity analysis of inter-well sand bodies at large well spacing was completed.

13. A well-to-well sand body connectivity analysis system under large well spacing, characterized in that: include: The division module is used to divide the development well network under large well spacing into several well groups; The plane model is used to obtain the inter-well sand body connectivity judgment results on the well plane within each well group based on production data; The selection module is used to select whether to end the inter-well sand body connectivity analysis based on the inter-well sand body connectivity judgment results on the plane: The execution model is used to determine the connectivity of the sand bodies between wells on the cross-section of each well group based on the production test data. The profile module is used to complete the inter-well sand body connectivity analysis under large well spacing based on the inter-well sand body connectivity judgment results on the profile.

14. An electronic device, characterized in that: include: a processor coupled to the memory; The memory is used to store computer programs; The processor is configured to execute the computer program stored in the memory, so that the electronic device executes the method according to any one of claims 1 to 12.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program or an instruction, and when the program or the instruction is executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 12.

Images