A method and system for analyzing interwell sand body connectivity under large well spacing

Abstract

The present application relates to a kind of interwell sand body connectivity analysis method and system under large well spacing, belong to the technical field of oil and gas development of large well spacing oilfield.The method includes dividing into several well groups under the development well pattern of large well spacing;Based on production data, the interwell sand body connectivity judgment result on the plane of each well group is obtained;Based on the interwell sand body connectivity judgment result on the plane, whether to end interwell sand body connectivity analysis is selected;If not, based on production test data, the interwell sand body connectivity judgment result on the profile in each well group is obtained;Based on the interwell sand body connectivity judgment result on the profile, interwell sand body connectivity analysis under large well spacing is completed.The present application analyzes the interwell sand body connectivity of production well from production data and production test data, restricts the distribution of interwell sand body, analyzes reservoir waterflood condition, and distributes pattern with percolation barrier in reservoir.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas development of large well spacing oilfield, and particularly relates to an interwell sand body connectivity analysis method and system under large well spacing. BACKGROUND

[0002] Many oilfields that have been developed for a long time have undergone initial water cut, medium water cut, high water cut and extra-high water cut development stages through years of water injection development, and the water cut and recovery percentage have reached a high level, and the whole has entered the high water cut stage. Therefore, under such conditions, to achieve further oil stabilization and water control, it is necessary to study the subsurface injection-production dynamic response with water injection development, and to understand the sand body plane production dynamic law in combination with the geological characteristics.

[0003] And with the continuous development of the oil industry, a large number of oilfield development practices show that during the long-term water injection development of the oilfield, the injected water has various dynamic geological effects on the reservoir. With the passage of time, the injected water not only displaces oil and gas, but also has a great impact on the physical properties, pore structure, heterogeneity and reservoir fluid properties of the reservoir, causing changes in the petrophysical properties of the reservoir rock. When studying the connectivity of the developed sand body, 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 seriously restrict the tapping of remaining oil in large well spacing oilfields that are mainly developed by vertical wells and horizontal wells in cooperation, and interwell sand body connectivity is becoming a hot and difficult research topic.

[0005] Sand body connectivity interpretation is a comprehensive analysis method based on the logging response characteristics of vertical wells and horizontal wells and comprehensive oil and gas field development dynamic data. With the continuous development of the oil industry, a large number of oilfield development practices show that during the long-term water injection development of the oilfield, the injected water has various dynamic geological effects on the reservoir. And when studying the connectivity of the developed sand body, it is necessary to understand the changes in production dynamics, but such changes are not chaotic, and there are certain rules to follow.

[0006] The interwell dynamic connectivity research method is mainly divided into test method analysis and production dynamic data analysis. The test method analysis here refers to tracer monitoring technology, which was widely used in the oil industry in the 1950s. Its principle is to inject tracers into injection wells and monitor the production of tracers in production wells to determine the interwell connectivity. When used in well groups, tracer monitoring technology can obtain accurate and high-precision analysis results. However, this technology is costly and has a long testing period, 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

[0007] In order to solve the above problems, the present application provides a method and system for analyzing interwell sand body connectivity under large well spacing, which comprehensively utilizes a large number of development dynamic data (production data and production test data) accumulated in the process of oilfield development to analyze the connectivity of interwell sand body on the plane and profile under large well spacing, so as to adapt to the actual situation that the interwell sand body changes fast and the connectivity state is complex, make up for the lack of a method for using dynamic data to constrain geological features to depict interwell connectivity in "double high" oilfields, understand the plane production dynamic law of the work area, and provide a reference for studying oil-water dynamic law and predicting remaining oil distribution.

[0008] The first object of the present application is to provide a method for analyzing interwell sand body connectivity under large well spacing, which comprises:

[0009] dividing the development well pattern under large well spacing into a plurality of well groups;

[0010] obtaining the interwell sand body connectivity judgment result on the plane of each well group based on production data;

[0011] selecting whether to end the interwell sand body connectivity analysis based on the interwell sand body connectivity judgment result on the plane;

[0012] if not, obtaining the interwell sand body connectivity judgment result on the profile of each well group based on production test data;

[0013] completing the interwell sand body connectivity analysis under large well spacing based on the interwell sand body connectivity judgment result on the profile.

[0014] In some embodiments of the present application, the division of the well groups is: taking a water injection well as the center and combining a line of production wells around the water injection well to divide into a group.

[0015] In some embodiments of the present application, the production data includes formation pressure test data, daily injection volume of the water injection well, water breakthrough and effect time and dynamic liquid level test result, and water cut, daily oil production and daily liquid production of the production well.

[0016] In some embodiments of the present application, the obtaining of the interwell sand body connectivity judgment result on the plane of each well group based on production data comprises:

[0017] judging whether the formation pressure test data changes consistently over time;

[0018] selecting whether to end the interwell sand body connectivity analysis according to the consistency judgment result;

[0019] if not, obtaining the well-to-well injection-production response judgment result based on the daily injection volume of the water injection well and the water cut, daily oil production and daily liquid production of the production well;

[0020] According to the well-to-well injection-production response judgment result, whether to end the interwell sand body connectivity analysis is selected:

[0021] If not, the water breakthrough and effect time type of the injection well is judged;

[0022] According to the judgment result of the water breakthrough and effect time type, whether to end the interwell sand body connectivity analysis is selected:

[0023] If not, the interwell 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 injection well.

[0024] In some embodiments of the present application, according to the consistency judgment result, whether to end the interwell sand body connectivity analysis is selected, including:

[0025] The consistency judgment result is not consistent, and the interwell sand body connectivity analysis is selected to end, wherein the result of the interwell sand body connectivity analysis corresponds to that there is no connectivity between the wells;

[0026] The consistency judgment result is consistent, and whether to end the interwell sand body connectivity analysis is selected.

[0027] In some embodiments of the present application, according to the well-to-well injection-production response judgment result, whether to end the interwell sand body connectivity analysis is selected, including:

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

[0029] The well-to-well injection-production response judgment result is consistent, and whether to end the interwell sand body connectivity analysis is selected.

[0030] In some embodiments of the present application, the judgment result of the water breakthrough and effect time type, whether to end the interwell sand body connectivity analysis is selected, including:

[0031] The judgment result of the water breakthrough and effect time type is not the first type, and the interwell sand body connectivity analysis is selected to end, wherein the result of the interwell sand body connectivity analysis corresponds to that there is no connectivity between the wells;

[0032] The judgment result of the water breakthrough and effect time type is the first type, and whether to end the interwell sand body connectivity analysis is selected.

[0033] In some embodiments of the present application, the interwell 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 injection well, including:

[0034] The dynamic liquid level test result of the injection well is that after water injection, the dynamic liquid level of the production well does not rise, and it is obtained that there is no connectivity between the wells;

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

[0036] In some embodiments of the present application, based on the judgment result of the interwell sand body connectivity on the profile, it is selected whether to end the interwell sand body connectivity analysis, comprising:

[0037] If the judgment result of the interwell sand body connectivity on the profile is not connected, it is selected to end the interwell sand body connectivity analysis;

[0038] If the judgment result of the interwell sand body connectivity on the profile is connected, it is selected whether to end the interwell sand body connectivity analysis.

[0039] In some embodiments of the present application, the production test data includes interwell tracer monitoring data and production and absorption profile analysis data.

[0040] In some embodiments of the present application, based on the production test data, the judgment result of the interwell sand body connectivity on the profile in each well group is obtained, comprising:

[0041] Based on the interwell tracer monitoring data, the judgment result of the interwell sand body connectivity on the profile in each well group is obtained;

[0042] And / or,

[0043] Based on the production and absorption profile analysis data, the judgment result of the interwell sand body connectivity on the profile in each well group is obtained.

[0044] In some embodiments of the present application, further comprising:

[0045] Combining the judgment result of the interwell sand body connectivity on the profile and the static data;

[0046] Based on the combination result, the interwell sand body connectivity analysis under large well spacing is completed.

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

[0048] The division module is used for dividing the development well pattern under large well spacing into several well groups;

[0049] The plane module is used for obtaining the judgment result of the interwell sand body connectivity on the well plane in each well group based on the production data;

[0050] The selection module is used for selecting whether to end the interwell sand body connectivity analysis based on the judgment result of the interwell sand body connectivity on the plane:

[0051] The execution module is used for judging the interwell sand body connectivity on the profile in each well group based on the production test data.

[0052] The profile module is used for completing the interwell sand body connectivity analysis under the large well spacing based on the interwell sand body connectivity judgment result on the profile.

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

[0054] The memory is configured to store a computer program.

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

[0056] A fourth object of the present application is to provide a computer readable storage medium storing a program or instructions, which, when executed on a computer, cause the computer to execute the method in the above embodiments.

[0057] The present application has the following beneficial effects:

[0058] The present application provides an interwell sand body connectivity analysis method and system under large well spacing, which analyzes the interwell sand body connectivity of production wells from the aspects of production data and production test data (pressure change, production curve, production and absorption profile, tracer, production interference condition, etc.), restrictively depicts the interwell sand body distribution, analyzes the water flooded condition of the reservoir, and analyzes the distribution mode of the percolation barrier in the reservoir.

[0059] Furthermore, the dynamic analysis result restricts the static analysis result of geology according to the data analysis result and the geological research, so that a more accurate interwell sand body connectivity analysis result is obtained.

[0060] The present application uses conventional logging data and production dynamic data to study the sand body connectivity in the research area, solves the problem that when the oilfield developed under the large well spacing enters the "double high" stage after a long time of development, the sand body and the remaining oil distribution need to be further understood, and the data used in the description and research of the reservoir sand body is relatively small and difficult to finely describe due to the influence of the offshore environmental factors.

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

[0062] The present application uses the development dynamic data to restrict the geological characteristics to describe the sand body connectivity, and provides the development scheme design basis for the stable production and the increased production of the oil and gas field developed under the large well spacing.

[0063] Other features and advantages of the present application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The purposes and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

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

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

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

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

[0069] Figure 5 A tracer monitoring data and analysis result graph of the A well group according to an embodiment of the present application is shown;

[0070] Figure 6 A liquid production profile analysis result graph of well C according to an embodiment of the present application is shown;

[0071] Figure 7 A water injection profile analysis result graph of well A according to an embodiment of the present application is shown;

[0072] Figure 8 A sand body connecting well profile under dynamic constraints of the A well group according to an embodiment of the present application is shown;

[0073] Figure 9 A framework diagram of a method for analyzing interwell sand body connectivity under large well spacing according to an embodiment of the present application is shown;

[0074] Figure 10 A framework diagram of an electronic device according to an embodiment of the present application is shown;

[0075] In the drawings:

[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] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0078] As shown in the figure, according to the method for analyzing interwell sand body connectivity under large well spacing according to an embodiment of the present application, the method comprises the following steps: Figure 1

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

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

[0081] Step S3, based on the interwell sand body connectivity judgment result on the plane, selecting whether to end the interwell sand body connectivity analysis:

[0082] Step S31, if not, based on production test data, obtaining the interwell sand body connectivity judgment result on the profile of each well group;

[0083] Step S4, based on the interwell sand body connectivity judgment result on the profile, completing the interwell sand body connectivity analysis under large well spacing.

[0084] In the embodiments of the present application, the development research is conducted on the large well spacing well pattern of an oilfield in the Bohai Sea in the Yellow River estuary sag, the No. 1, No. 2 and No. 3 sand bodies of the reservoir are interpreted, and the sand body connectivity relationship is established.

[0085] Basic situation of the research area:

[0086] ​The sandstone of the research area is a typical shallow-water delta deposit, the water body is stable during deposition, and the depositional landform is stable for a long time. It has a structure similar to a heart beach, a distributary channel, an interdistributary channel, and a lacustrine mud, etc. The respective characteristics are as follows: the heart beach is the skeleton sand body of the delta, the sand body has a large deposition thickness, a relatively wide planar distribution, and good continuity. The well logging curve is mainly box-shaped or composite box-shaped. The seismic facies waveform amplitude is obvious. The distributary channel: in the delta depositional system, not all the distributary channels are favorable positions for sand body development, which are mainly water passages and sand body transport passages. The channel sand body deposition thickness is less than 5 meters, and the well logging curve is bell-shaped or boot-shaped. The interdistributary channel: the lake bay formed between the distributary channels is limited in water body, and the sediment is mainly gray-green mudstone containing thin layers of flood inundation deposition fine sand. The bedding structure is mainly horizontal bedding, which is developed vertically above the pre-shallow-water delta mudstone or shallow-water delta front sand body. Due to the low sand content and fine lithology, the spontaneous potential and natural gamma curves are low and flat. The lacustrine mud: the sand body is not developed, and the reduction color mud deposition is mainly used, and the spontaneous potential and natural gamma curves are low and flat.

[0087] In step S1, the large-spacing development pattern is divided into several well groups, specifically, according to the position relationship between the injection well and the production well, the injection well is taken as the center to include the surrounding line of production wells to divide the well group, in the embodiment of the present application, the large-spacing well pattern in the region is divided into 18 groups;

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

[0089] Step A1, judging whether the formation pressure test data has consistency with time;

[0090] Step A2, according to the consistency judgment result, selecting whether to end the inter-well sand body connectivity analysis:

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

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

[0093] Step A31, if not, judging the water breakthrough and effect time type of the injection well;

[0094] Step A4, according to the judgment result of the water breakthrough and effect time type, selecting whether to end the inter-well sand body connectivity analysis:

[0095] Step A41, if not, based on the dynamic liquid level test result of the injection well, the inter-well sand body connectivity judgment result on the well plane in each well group is obtained.

[0096] The production data includes formation pressure test data, daily injection volume of the injection well, water breakthrough and effect time, and dynamic liquid level test results and water cut, daily oil production and daily liquid production of the oil production well.

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

[0098] Under the original conditions of the formation, the pressures at different places in the same pressure system should be balanced. After the reservoir is put into development, if the reservoir sand bodies are connected and belong to the same flow unit, with the continuous development of the production well, the formation will appear pressure depletion, recovery and overpressure. If they belong to different flow units and pressure systems, the well will not be affected by the development of the surrounding production wells, and the formation pressure is relatively stable, or the formation pressure changes without corresponding rules;

[0099] Therefore, the result of judging whether the formation pressure test data changes with time consistently is:

[0100] The consistency judgment result is that the formation pressure test data changes with time stably or shows no corresponding change in formation pressure;

[0101] Or,

[0102] The consistency judgment result is that the formation pressure test data changes with time consistently, that is, it shows depletion, recovery and overpressure phenomena;

[0103] In step A2, whether to end the interwell sand body connectivity analysis is selected according to the consistency judgment result, including:

[0104] The consistency judgment result is that the formation pressure test data changes with time stably or shows no corresponding change in formation pressure;

[0105] The consistency judgment result is that the formation pressure test data changes with time consistently, that is, it shows depletion, recovery and overpressure phenomena;

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

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

[0108] The water cut, daily oil production and daily liquid production of the production well are obtained from a water cut, daily oil production and daily liquid production curve (production data) of the production well, and based on the three parameters, a monthly cumulative liquid production and a monthly cumulative oil production are obtained;

[0109] The well-to-well injection-production response judgment is that the production characteristics of the production well can respond to the changes of the injection characteristics of the injection well, wherein the injection characteristics of the injection well refer to that the injection well production curve can be divided into different types according to the daily injection volume curve characteristics of the injection well, and different injection curve types represent different injection policies and reflect different injection well characteristics; the production characteristics of the production well refer to that the production curve of the production well is divided into types according to different characteristics of the water cut, daily oil production and daily liquid production curve, and reflects different production characteristics of the production well;

[0110] For the purpose of improving the understanding, exemplarily, the monthly cumulative oil production of the production well is equal to the monthly cumulative injection volume of the injection well, and the daily oil production curve characteristics (here, the characteristics refer to the rising, falling and peak position of the curve) of the production well respond to the characteristics of the daily injection volume curve of the injection well, that is, it is indicated that the well-to-well injection-production response judgment result is that the well-to-well injection-production response is consistent;

[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, it is entered into step A3, and according to the well-to-well injection-production response judgment result, it is selected whether to end the interwell sand body connectivity analysis, including:

[0113] The well-to-well injection-production response judgment result is that the well-to-well injection-production response is inconsistent, and the interwell sand body connectivity analysis is selected to be ended, wherein the result of the interwell sand body connectivity analysis corresponds to that there is no connectivity between the wells, that is, step A3 is completed, the connectivity analysis between two wells in the first group of wells is completed, the connectivity analysis between other wells in the first group of wells is selected, and the step A1 is performed again;

[0114] The well-to-well injection-production response judgment result is that the well-to-well injection-production response is consistent, and the interwell sand body connectivity analysis is selected not to be ended, that is, it is entered into step A31.

[0115] Specifically, in step A31, the injection well water breakthrough and effect time type is determined according to the following table:

[0116] The water breakthrough and effect time type is divided into two types according to the good and bad degree of the water injection effect, and the two types are a first type and a non-first type, the water breakthrough and effect time of the first type is fed back as good water injection effect, and the water breakthrough and effect time of the non-first type is fed back as bad water injection effect;

[0117] Therefore, the judgment result of the water breakthrough and effect time type is:

[0118] The judgment result of the water breakthrough and effect time type is the non-first type;

[0119] Or,

[0120] The judgment result of the water breakthrough and effect time type is the first type.

[0121] The good and bad degree of the water injection effect can directly reflect the connectivity between the wells, therefore, in step A4, whether to end the interwell sand body connectivity analysis is selected according to the judgment result of the water breakthrough and effect time type, and specifically:

[0122] The judgment result of the water breakthrough and effect time type is the non-first type, and the interwell sand body connectivity analysis is selected to be ended, wherein the result of the interwell sand body connectivity analysis corresponds to that the wells do not have connectivity, that is, in step A4, the connectivity analysis between two wells in the first group of wells is completed, the connectivity analysis between other wells in the first group of wells is selected, and the step A1 is performed again;

[0123] The judgment result of the water breakthrough and effect time type is the first type, and the interwell sand body connectivity analysis is selected to be not ended, that is, step A41.

[0124] Specifically, in step A41, the interwell 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, and the interwell sand body connectivity judgment result on the well plane in each well group includes:

[0125] The dynamic liquid level test result of the water injection well is that the dynamic liquid level of the production well does not rise after water injection, and it is obtained that the wells do not have connectivity, that is, in step A41, the connectivity analysis between two wells in the first group of wells is completed, the connectivity analysis between other wells in the first group of wells is selected, and the step A1 is performed again;

[0126] The dynamic liquid level test result of the water injection well is that the dynamic liquid level of the production well rises after water injection, and the interwell sand body connectivity judgment result on the well plane in each well group is obtained.

[0127] After step A41 is completed, the interwell sand body connectivity between the wells in the first group of wells on the plane is judged, and then whether to end the interwell sand body connectivity analysis is selected according to the interwell sand body connectivity judgment result on the plane, that is, the judgment operation of step S3 is performed;

[0128] On the basis of step S2, the interwell sand body connectivity on the plane of each well group is determined, i.e., step S31 is entered;

[0129] Specifically, in step S31, the interwell sand body connectivity on the profile of each well group is determined based on the production test data, including:

[0130] The interwell sand body connectivity on the profile of each well group is determined based on the interwell tracer monitoring data;

[0131] and / or,

[0132] The interwell sand body connectivity on the profile of each well group is determined based on the production and absorption profile analysis data;

[0133] The production test data includes the interwell tracer monitoring data and the production and absorption profile analysis data.

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

[0135] The interwell sand body connectivity on the profile of each well group is determined based on the interwell tracer monitoring data;

[0136] and / or,

[0137] The interwell sand body connectivity on the profile of each well group is determined based on the production and absorption profile analysis data;

[0138] That is, if the existing production test data only includes the interwell tracer monitoring data, the interwell tracer monitoring data can be used for determination; if the existing production test data only includes the production and absorption profile analysis data, the production and absorption profile analysis data can be used for determination; if the existing production test data includes both the interwell tracer monitoring data and the production and absorption profile analysis data, one of them or both can be used for analysis and determination to save the cost of analysis and determination and to speed up;

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

[0140] The interwell sand body connectivity on the profile of each well group determined based on the interwell tracer monitoring data is:

[0141] The interwell tracer monitoring data includes the injection fluid (containing tracer) injection direction on the plane and in the vertical direction, movement law, and distribution condition, which can reveal the reservoir heterogeneity and interwell connectivity;

[0142] For improving the understanding, exemplarily, one well injects tracer in H layer, another well detects the tracer in H layer, which indicates that the interwell sand body on the profile is connected, if another well does not detect the tracer in H layer, which indicates that the interwell sand body on the profile is not connected.

[0143] The interwell sand body connectivity on the profile in each well group is determined based on the production and absorption profile analysis data, which is:

[0144] The production and absorption profile analysis data (horizon, water absorption thickness, small layer water absorption amount and water absorption intensity, etc.) can be used to understand the longitudinal distribution and variation trend of injected water in the reservoir, and to constrain the description of sand bodies in geology, that is, to determine the interwell sand body connectivity on the profile.

[0145] For improving the understanding, exemplarily, in the production and absorption profile analysis data between the wells, the water absorption thickness, water absorption amount and water absorption intensity of the water injection well corresponding to the horizon are consistent with the liquid production and oil production data of the oil production well in the same period, then the interwell sand body on the profile is connected, otherwise, the interwell sand body on the profile is not connected.

[0146] According to the above steps, the interwell sand body connectivity in the first group of wells is analyzed on the plane and the profile, and then the steps S2-S31 are repeated to complete the analysis of the interwell sand body connectivity in the remaining groups of wells, until the analysis of the interwell sand body connectivity in all wells in the large spacing development pattern is completed, and a connectivity map of the large spacing development pattern is formed, that is, step S4, based on the interwell sand body connectivity on the profile, the interwell sand body connectivity analysis under large spacing is completed.

[0147] In some embodiments of the present application, in order to prevent errors in data analysis and improve the accuracy of the above-mentioned interwell sand body connectivity analysis of the large spacing development pattern, the interwell sand body connectivity analysis method of the large spacing development pattern further comprises:

[0148] The interwell sand body connectivity on the profile is combined with the static data, wherein the static data includes sedimentary facies and sand body distribution data, which is geological analysis data in the development stage and can feedback the sand body connectivity.

[0149] The interwell sand body connectivity on the profile is combined with the static data, that is, the conclusion of the interwell sand body connectivity determined by the above-mentioned step data analysis (hereinafter referred to as analysis conclusion) is compared with the data of the interwell sand body connectivity revealed in the static data (hereinafter referred to as geological conclusion).

[0150] If:

[0151] ① The analysis conclusion is that the interwell sand body on the plane is connected, and the interwell sand body on the profile is not connected.

[0152] The same well is located in the same period geological conclusion, the plane on the interwell sand body is connected, the profile on the interwell sand body is connected;

[0153] Then the interwell sand body connectivity result in the analysis conclusion is modified, so that the analysis conclusion and the geological conclusion are consistent;

[0154] The analysis conclusion is that the plane on the interwell sand body is connected, and the profile on the interwell sand body is connected;

[0155] The same well is located in the same period geological conclusion, the plane on the interwell sand body is connected, the profile on the interwell sand body is not connected; or, the plane on the interwell sand body is not connected, and the profile on the interwell sand body is not connected;

[0156] Then the interwell sand body connectivity result in the analysis conclusion is retained.

[0157] Based on the above combination result, the interwell sand body connectivity analysis under the large well spacing is completed, and a new connectivity diagram of the development well pattern under the large well spacing is formed.

[0158] For better understanding, in the embodiment of the present application, some results of the above analysis process are exemplarily displayed by taking a large well spacing well pattern oilfield in a certain oilfield in the Yellow River estuary sag Bohai as an example, and the specific embodiments are as follows:

[0159] Figure 2The well group is shown in the first sand body on the static pressure test data analysis results of each well. From the well group, the principle of local proximity is adopted, and whether the formation pressure test data of two wells changes with time is consistent can directly reflect the reservoir connectivity. If it is judged to be connected, the production characteristics can be further compared and verified. For example, B well is a straight well oil production well in A well group with longer development time, and both wells are shot in A sand body. During the second injection of A well, the pressure of B well decays rapidly, and the formation pressure recovers after the injection well is re-injected. Therefore, the two wells in A sand body may have good connectivity. J well, D well and E well are horizontal oil production wells in A well group, which are developed in A sand body. J well has no obvious formation pressure recovery or rise when A well is re-injected for the first time, but it decays instead, so it is believed that J well and A well may not be connected. D well has stable test data four times, and there is no significant change before and after A well is injected for the first time, so it is believed that D well and A well may not be connected. E well has a significant recovery of formation pressure after A well is injected for the first time, and tends to be stable and decay, and has a corresponding recovery of formation pressure after the second injection of the injection well, so it is speculated that E well and A well have good connectivity. B well is put into production earlier than E well, and the first pressure test data of E well is slightly lower than that of B well after it is put into production. Therefore, in addition to C well, which has too little pressure test data to be judged, it can be preliminarily concluded that only A well, E well and B well in the well group are in the same pressure system and have good connectivity with each other.

[0160] Figure 3 The production dynamic curve of A well in A well group is shown, Figure 4 In oilfield development, the production task is often heavy, and each well cannot be tested in time. Therefore, the production interference analysis method is also one of the important means to judge the connectivity of sand bodies between wells. The so-called production interference analysis method is to take adjacent wells as the basic unit, according to the production change (new well production, choke change, well shut-down, etc.) information of single well, to track the interference information received by adjacent wells, such as oil pressure, production, water cut and other dynamic information, so as to infer the connectivity between wells.

[0161] Similarly, in A well group, A well and C well, B well are both shot in No. 1 and No. 2 sand bodies. A injection change and well shut-down measures do not produce relevant response to C well dynamic information, and no interference information occurs, so it can be inferred that A well and C well may have seepage barrier between wells, and the connectivity is poor.

[0162] Since its commissioning in 2009, Well B 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 cut of Well B showed a rapid increase accordingly, indicating significant inter-well interference. This suggests a good connection between Well B and Well A, corroborating the inter-well connectivity characteristics identified through formation pressure testing.

[0163] Inter-well interference can sometimes present weak responses and multiple solutions when determining sand body connectivity. For example, well E, from its commissioning in 2011 until the end of 2012, had a low water cut and showed good interference information response with the shut-down injection well A. However, between 2014 and 2016, as the injection volume and allocation of water from the injection well increased, the water cut of this production well gradually decreased. This could be due to weak inter-well interference information or the influence of decreased injection volumes from surrounding wells. Therefore, inter-well interference information analysis is characterized by multiple solutions and requires analysis and judgment of sand body connectivity in conjunction with other dynamic responses.

[0164] Figure 5 The diagram shows the tracer monitoring data and analysis results for Well Group A. Inter-well tracer monitoring is the most direct and effective method to understand reservoir heterogeneity and inter-well connectivity by observing the direction of injection, movement patterns, and distribution of the injected fluid in both planar and vertical directions. In Well Group A, tracer 2,3,4,5-tetrafluorobenzoic acid was injected into the No. 1 sand body layer of Well A, and tracer BHSZ-01 was injected into the No. 2 and No. 3 sand bodies (joint production). By monitoring the tracer effect at each production layer in surrounding wells, the results reflect the same conclusions as those obtained from formation pressure testing and analysis, and inter-well interference information analysis. Furthermore, it allows for the identification of interconnected layers. For example, Well A and Well B are connected at the No. 1 sand body layer, while the connectivity at the No. 2 and No. 3 sand body layers is relatively poor, indicating that Well A and Well B are connected at the No. 1 sand body layer in the cross-section.

[0165] Figure 6 The results of the fluid production profile analysis of well C are shown in the figure. Figure 7The water injection profile analysis result of the A well water injection well is shown; in the oilfield development, the tracer monitoring data is often less, therefore, in addition to the tracer data, the production and absorption profile analysis method can also be adopted to determine the connection relationship of each layer between the wells in the well group. The production and absorption profile analysis method is to determine the dominant water absorption and liquid production layer of the reservoir according to the production and water absorption test data. Meanwhile, the timeliness of water injection and the time lag of water injection response also need to be considered, therefore, the water injection profile of the water injection well closest to the production well liquid production test time and earlier than the test time is selected, and the interwell connected layer is analyzed in combination with the perforation data. First of all, according to the production and absorption profile analysis of the A well group, it can be seen that the dominant water absorption layer of the A well is the No. 1, No. 2 and No. 3 sand bodies, and the water absorption of the No. 1 sand body is the most obvious. The dominant liquid production of the C well is also the No. 0 sand body, and the liquid production profile of the C well is obviously low in the No. 1 and No. 2 sand bodies, which is inconsistent with the characteristics of the dominant water absorption layer of the A well being the No. 1 and No. 2 sand bodies, therefore, it is proved that there is no dominant water injection migration channel between the C well and the A well in the No. 1 and No. 2 sand bodies, which is consistent with the previous data analysis result.

[0166] Figure 8 The sand body connected well profile under the dynamic constraint of the A well group is shown. It can be seen from the Figure 8 No. 1 sand body that the connection relationship between the A well and the B well is relatively strong, and the A well and the C well are not connected. The sandstones among the three wells on the No. 2 sand body do not have a connection relationship. The water injection well A and the two production wells B and C are weakly connected on the No. 3 sand body. When the dynamic method is used to analyze the interwell reservoir connectivity, there are often weak dynamic responses among the wells and multiple solutions (such as interference testing, production and absorption profile analysis), and lack of data (such as formation pressure testing), and the like, and it is necessary to comprehensively analyze various dynamic data of the well group to make the analysis results of various dynamic response data consistent with each other. Finally, the analysis of various dynamic data of the well group is comprehensively analyzed, so that the analysis results of various dynamic response data are consistent with each other. Thus, the reservoir sand body connection relationship on the plane and profile of the working area is obtained.

[0167] As Figure 9 shown, in the embodiment of the present application, an interwell sand body connectivity analysis system under large well spacing is provided, the analysis system comprises:

[0168] The division module 1 is used for dividing the development well pattern under large well spacing into a plurality of well groups;

[0169] The plane module 2 is used for obtaining the interwell sand body connectivity judgment result on the well plane in each well group based on the production data;

[0170] The selection module 3 is used for selecting whether to end the interwell sand body connectivity analysis based on the interwell sand body connectivity judgment result on the plane;

[0171] The execution module 4 is used for obtaining the interwell sand body connectivity judgment result on the profile in each well group based on the production test data if no;

[0172] 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 results on the profile.

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

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

[0175] The processor is configured to execute the computer program stored in the memory, so that the electronic device performs the determination method as described in the above embodiments.

[0176] like Figure 10 As shown, in some embodiments of the present invention, an electronic device 300 is provided, including: 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 configured to execute the computer program stored in the memory, so that the electronic device performs the determination method as described in the above embodiment.

[0179] In some embodiments of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing a program or instructions that, when run on a computer, cause the computer to perform the methods described in the above embodiments.

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

[0181] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to 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 sand bodies between wells under large well spacing, characterized in that, include: The development well network with large well spacing is divided into several well groups; Based on production data, the results of the inter-well sand body connectivity assessment on the well plane within each well group are obtained, including: Determine whether the formation pressure test data changes consistently over time; Based on the consistency assessment results, choose whether to terminate the inter-well sand body connectivity analysis: If not, based on the daily injection rate of the injection well and the water cut, daily oil production, and daily fluid production of the production well, the well-to-well injection-production response judgment result is obtained; Based on the well-to-well injection-production response results, determine whether to terminate the inter-well sand body connectivity analysis: If not, determine the type of time it takes for the injection well to see water and become effective; Based on the assessment results of the time type for water exposure and effectiveness, decide whether to terminate the inter-well sand body connectivity analysis: If not, based on the dynamic fluid 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; Based on the inter-well sand body connectivity assessment results on the plane, choose whether to end the inter-well sand body connectivity analysis: If not, based on production test data, the results of the inter-well sand body connectivity assessment on the profiles within each well group are obtained, including: Based on the monitoring data of the inter-well tracer, the results of the inter-well sand body connectivity judgment on the profile of each well group were obtained; And / or, Based on the analysis data of the production and absorption profile, the results of the judgment on the inter-well sand body connectivity on the profile of each well group were obtained. Based on the results of the inter-well sand body connectivity assessment on the profile, the inter-well sand body connectivity analysis under large well spacing was completed.

2. The method for analyzing inter-well sand body connectivity under large well spacing according to claim 1, characterized in that, The well groups are divided as follows: the water injection well is the center, and the surrounding oil production wells are grouped together.

3. The method for analyzing the connectivity of sand bodies between wells under large well spacing according to claim 1, characterized in that, The production data includes formation pressure test data, daily injection volume of water injection wells, time to water breakthrough and effectiveness, dynamic fluid level test results, water cut of oil production wells, daily oil production and daily fluid production.

4. The method for analyzing the connectivity of sand bodies between wells under large well spacing according to claim 1, characterized in that, The step of selecting whether to end the inter-well sand body connectivity analysis based on the consistency judgment results includes: The consistency judgment result is that there is no consistency, so the inter-well sand body connectivity analysis is terminated. The result of the inter-well sand body connectivity analysis corresponds to the wells not being connected. If the consistency judgment result is consistent, select "No" to end the inter-well sand body connectivity analysis.

5. The method for analyzing the connectivity of sand bodies between wells under large well spacing according to claim 1, characterized in that, The step of determining whether to terminate the inter-well sand body connectivity analysis based on the well-to-well injection-production response results includes: The well-to-well injection-production response judgment result is that the well-to-well injection-production response is inconsistent, so the inter-well sand body connectivity analysis is terminated. The result of the inter-well sand body connectivity analysis corresponds to the wells not being connected. If the well-to-well injection-production response 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 1, characterized in that, The judgment result of the water-seeking and effectiveness-time type, and the selection of whether to end the inter-well sand body connectivity analysis, include: The judgment result of the time type for seeing water and seeing effect is not the first type, so the analysis of inter-well sand body connectivity is terminated. The result of the analysis of inter-well sand body connectivity corresponds to the wells not being connected. The judgment result of the water-seeing and effective time type is the first type. Select "No" to end the inter-well sand body connectivity analysis.

7. The method for analyzing the connectivity of sand bodies between wells under large well spacing according to claim 1, characterized in that, The results of the dynamic fluid level test based on the injection wells are used to determine the inter-well sand body connectivity on the well plane within each well group, including: The dynamic fluid level test results of the water injection wells showed that after water injection, the dynamic fluid level of the oil production wells did not rise, and there was no connectivity between the wells. The dynamic fluid level test results of the water injection well show that after water injection, the dynamic fluid level of the oil production well rises, which leads to the judgment result that the sand bodies between wells are connected on the well plane within each well group.

8. The method for analyzing the connectivity of sand bodies between wells under large well spacing according to claim 7, characterized in that, The decision on whether to end the inter-well sand body connectivity analysis based on the cross-section sand body connectivity assessment results includes: The inter-well sand body connectivity assessment result on the profile is "not connected", so we select to end the inter-well sand body connectivity analysis. The inter-well sand body connectivity assessment result on the profile is a connectivity assessment result. Select "No" to end the inter-well sand body connectivity analysis.

9. The method for analyzing the connectivity of sand bodies between wells under large well spacing according to claim 1, characterized in that, The production test data includes inter-well tracer monitoring data and production absorption profile analysis data.

10. The method for analyzing the connectivity of sand bodies between wells under large well spacing according to any one of claims 1-9, characterized in that, Also includes: Combine the results of the inter-well sand body connectivity assessment on the profile with static data; Based on the combined results, the inter-well sand body connectivity analysis under large well spacing was completed.

11. A system for analyzing the connectivity of sand bodies between wells under large well spacing, characterized in that, include: The partitioning module is used to divide the development well network with large well spacing into several well groups; The planar module is used to determine the inter-well sand body connectivity on the well plane within each well group based on production data, including: Determine whether the formation pressure test data changes consistently over time; Based on the consistency assessment results, choose whether to terminate the inter-well sand body connectivity analysis: If not, based on the daily injection rate of the injection well and the water cut, daily oil production, and daily fluid production of the production well, the well-to-well injection-production response judgment result is obtained; Based on the well-to-well injection-production response results, determine whether to terminate the inter-well sand body connectivity analysis: If not, determine the type of time it takes for the injection well to see water and become effective; Based on the assessment results of the time type for water exposure and effectiveness, decide whether to terminate the inter-well sand body connectivity analysis: If not, based on the dynamic fluid 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; The selection module is used to determine whether to end the inter-well sand body connectivity analysis based on the results of the inter-well sand body connectivity assessment on the plane. If not, the execution module, based on production test data, obtains the results of the inter-well sand body connectivity judgment on the profile within each well group, including: Based on the monitoring data of the inter-well tracer, the results of the inter-well sand body connectivity judgment on the profile of each well group were obtained; And / or, Based on the analysis data of the production and absorption profile, the results of the judgment on the inter-well sand body connectivity on the profile of each well group were obtained. The profile module is used to perform inter-well sand body connectivity analysis under large well spacing based on the inter-well sand body connectivity judgment results on the profile.

12. An electronic device, characterized in that, include: Processor, the processor being coupled to memory; The memory is used to store computer programs; The processor is configured to execute the computer program stored in the memory to cause the electronic device to perform the method as described in any one of claims 1 to 10.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a program or instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 1 to 10.

Images