A method and device for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs

Abstract

This specification proposes a method and device for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs. The method includes: acquiring geological data of the target area; and obtaining an injection-production interference stage identification curve and an injection-production crossflow stage identification curve based on the geological data; dividing the injection-production stage according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result; obtaining the curve derivative and production-injection ratio of the target production well according to the injection volume after splitting of the target production well; and identifying crossflow according to the curve derivative, the production-injection ratio, and the division result. Based on the above method, it is possible to accurately identify whether crossflow has occurred in the target production well and the time when crossflow has occurred, so as to formulate reasonable profile adjustment and plugging measures to improve the efficiency of oil reservoir recovery.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy oil reservoir exploitation, and in particular to a method and device for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs. Background Art

[0002] Under the condition of long-term steam injection thermal recovery in heavy oil reservoirs, the injection wells and production wells are interconnected, forming crossflow channels, which cause the water content and bottom hole temperature of some production wells to rise sharply, and the steam moves in a directional manner. This phenomenon is called crossflow. Crossflow will cause the steam injected from the injection well to reach the production well along the crossflow channel, forming an invalid thermal cycle, which will lead to a decrease in the effective heated volume of the heavy oil reservoir and a decrease in oil recovery efficiency. Therefore, accurate identification of crossflow is of great significance for formulating reasonable profile control and plugging measures and improving the development benefits of oil reservoirs.

[0003] In the prior art, well testing data is usually used to identify crossflow. This method requires opening and closing wells during the identification process, which will affect the normal operation of injection wells and production wells.

[0004] Currently, no effective solution has been proposed for the above technical problems. Summary of the invention

[0005] The present specification provides a method and device for identifying crossflow during steam injection thermal recovery in heavy oil reservoirs, which can solve the technical problem that crossflow cannot be easily and quickly identified in the prior art, so as to guide the recovery of heavy oil reservoirs.

[0006] The purpose of the embodiment of this specification is to provide a method for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs, comprising:

[0007] Acquire geological data of the target area; and obtain an injection-production interference stage identification curve and an injection-production crossflow stage identification curve based on the geological data;

[0008] According to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve, the injection-production stage is divided to obtain a division result;

[0009] According to the injection volume after splitting of the target production well, the curve derivative and production-injection ratio of the target production well are obtained;

[0010] Crossflow is identified according to the curve derivative, the production-injection ratio, and the division result.

[0011] Furthermore, in another embodiment of the method, obtaining the injection-production interference stage identification curve and the injection-production crossflow stage identification curve according to the geological data includes:

[0012] According to the geological data, construct an injection-production interference stage model and an injection-production crossflow stage model;

[0013] Derivatives of the injection-production interference stage model and the injection-production crossflow stage model are obtained respectively to obtain an injection-production interference stage identification curve and an injection-production crossflow stage identification curve.

[0014] Furthermore, in another embodiment of the method, the division result includes a charging area, an interference area, and a crossflow area.

[0015] Furthermore, in another embodiment of the method, the injection-production stage is divided according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain the division result, including:

[0016] Dividing the area above the injection-production interference stage identification curve into an energy charging area;

[0017] Dividing the area between the injection-production interference stage identification curve and the injection-production crossflow stage identification curve as an interference area;

[0018] Dividing the area below the injection-production crossflow stage identification curve into a crossflow area;

[0019] Combining the charging area, the interference area, and the crossflow area to obtain a target plate;

[0020] The target plate is taken as the division result.

[0021] Furthermore, in another embodiment of the method, before obtaining the curve derivative and the production-injection ratio of the target production well according to the post-splitting injection volume of the target production well, the method further includes:

[0022] Obtain the total liquid production of the production well, the liquid production of the target production well, and the total injection volume of the injection well;

[0023] According to the total liquid production of the production well, the liquid production of the target production well, and the total injection volume of the injection well, the target production well is split and calculated to obtain the injection volume of the target production well after splitting.

[0024] Furthermore, in another embodiment of the method, the identifying crossflow according to the curve derivative, the production-injection ratio, and the division result includes:

[0025] Combining the curve derivative and the production-injection ratio to obtain target data;

[0026] Detecting the position of the target data in the target plate;

[0027] When it is determined that all the target data are located in the crossflow area in the target plate, it is determined that crossflow has occurred in the target production well during the time period corresponding to the target data.

[0028] Furthermore, in another embodiment of the method, after detecting the position of the target data in the target map, the method further includes: in a case where it is determined that the target data is partially located in a crossflow area in the target map, determining that crossflow has occurred in the target production well at a time point corresponding to the target data.

[0029] Furthermore, in another embodiment of the method, after detecting the position of the target data in the target map, the method further includes: determining that no crossflow occurs in the target production well when it is determined that all of the target data are located in the energized area and / or interference area in the target map.

[0030] On the other hand, the embodiment of this specification also provides a device for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs, comprising:

[0031] The first calculation module is used to obtain geological data of the target area; and obtain an injection-production interference stage identification curve and an injection-production crossflow stage identification curve according to the geological data;

[0032] A division module, used to divide the injection-production stage according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result;

[0033] The second calculation module is used to obtain the curve derivative and the production-injection ratio of the target production well according to the injection volume after splitting of the target production well;

[0034] An identification module is used to identify crossflow according to the curve derivative, the production-injection ratio, and the division result.

[0035] On the other hand, the embodiments of this specification further provide a computer-readable storage medium having computer instructions stored thereon, and when the computer-readable storage medium executes the instructions, the method for identifying crossflow in thermal recovery by steam injection in heavy oil reservoirs described above is implemented.

[0036] The embodiments of the present specification provide a method and device for identifying crossflow during steam injection thermal production in a heavy oil reservoir, which obtains geological data of a target area; and obtains an injection-production interference stage identification curve and an injection-production crossflow stage identification curve based on the geological data; divides the injection-production stages according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result; obtains a curve derivative and a production-injection ratio of a target production well according to the injection volume of the target production well after splitting; and identifies crossflow based on the curve derivative, the production-injection ratio, and the division result.

[0037] Furthermore, when the injection-production interference stage identification curve and the injection-production crossflow stage identification curve are obtained according to the geological data, an injection-production interference stage model and an injection-production crossflow stage model are constructed according to the geological data; the derivatives of the injection-production interference stage model and the injection-production crossflow stage model are respectively obtained to obtain the injection-production interference stage identification curve and the injection-production crossflow stage identification curve.

[0038] Furthermore, when the injection-production interference stage identification curve and the injection-production crossflow stage identification curve are used to divide the injection-production stages and obtain the division result, the area above the injection-production interference stage identification curve is divided into the charging zone; the area between the injection-production interference stage identification curve and the injection-production crossflow stage identification curve is divided into the interference zone; the area below the injection-production crossflow stage identification curve is divided into the crossflow zone; the charging zone, the interference zone and the crossflow zone are combined to obtain a target plate; and the target plate is used as the division result. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of this specification, the drawings required for use in the embodiments will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 This is a flow chart of an embodiment of a method for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs provided in this specification;

[0041] Figure 2 is a schematic diagram of a target plate in one embodiment of this specification;

[0042] Figure 3 is a schematic diagram of a connectivity curve and a curve derivative in one embodiment of this specification;

[0043] Figure 4 It is a schematic diagram of crossflow identification in a specific scenario example of this specification;

[0044] Figure 5 This is a schematic diagram of the module structure of an embodiment of a device for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs provided in this specification;

[0045] Figure 6 This is a schematic diagram of the structural composition of a server provided in this manual. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0047] Considering that under the conditions of long-term steam injection thermal recovery in heavy oil reservoirs, the injection wells and production wells are interconnected, forming crossflow channels, which causes the water content and bottom hole temperature of some production wells to rise sharply, and the steam moves in a directional manner. This phenomenon is called crossflow. Crossflow will cause the steam injected from the injection well to reach the production well along the crossflow channel, forming an invalid thermal cycle, which will lead to a decrease in the effective heated volume of the heavy oil reservoir and a decrease in the oil recovery efficiency. Therefore, accurate identification of crossflow is of great significance for formulating reasonable profile control and plugging measures and improving the development benefits of oil reservoirs.

[0048] It is further considered that the existing crossflow identification technology includes the use of well test data to identify crossflow. This method requires the operation of opening and closing wells during the identification process, which will affect the normal operation of injection wells and production wells. It also includes the use of tracers to track the injection components of injection wells and the output components of production wells to determine whether crossflow occurs between wells and the intensity of crossflow. This method requires a long time to measure.

[0049] In view of the above-mentioned problems existing in the existing methods and the specific reasons for the above-mentioned problems, this application introduces an identification method for steam injection thermal recovery crossflow in heavy oil reservoirs based on the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain accurate crossflow identification results.

[0050] Based on the above ideas, this specification proposes a method for identifying crossflow in steam injection thermal production in heavy oil reservoirs. First, the geological data of the target area is obtained; and the injection-production interference stage identification curve and the injection-production crossflow stage identification curve are obtained based on the geological data; then, the injection-production stage is divided according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain the division result; according to the injection volume of the target production well after splitting, the curve derivative and the production-injection ratio of the target production well are obtained; finally, the crossflow is identified based on the curve derivative, the production-injection ratio, and the division result.

[0051] See also Figure 1 As shown, the embodiment of this specification provides a method for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs. In specific implementation, the method may include the following contents.

[0052] S101: Acquire geological data of a target area; and obtain an injection-production interference stage identification curve and an injection-production crossflow stage identification curve according to the geological data.

[0053] In some embodiments, the above-mentioned target area specifically refers to the area near the target well group; wherein the target well group is a well group consisting of an injection well and multiple production wells; the injection well is used to inject steam, and the production well is used to obtain heavy oil; one well can be determined from the production wells as the target production well; the injection well and the production well are both horizontal wells.

[0054] In some embodiments, the target production well and injection well may be collectively referred to as injection-production wells.

[0055] In some embodiments, steam that meets the design requirements is injected into the heavy oil reservoir from the injection well. The distillation and driving effects of the steam will drive the heavy oil reservoir to flow to the production well, and the high-temperature steam will also reduce the viscosity of the heavy oil to facilitate flow, thereby achieving the purpose of extracting the heavy oil from the production well.

[0056] In some embodiments, the above-mentioned injection-production interference stage identification curve and injection-production crossflow stage identification curve obtained according to the geological data may include:

[0057] S1: constructing an injection-production interference stage model and an injection-production crossflow stage model according to the geological data;

[0058] S2: respectively obtaining derivatives of the injection-production interference stage model and the injection-production crossflow stage model to obtain an injection-production interference stage identification curve and an injection-production crossflow stage identification curve.

[0059] In some embodiments, the above-mentioned construction of the injection-production interference stage model and the injection-production crossflow stage model based on the geological data may include: constructing the injection-production interference stage model and the injection-production crossflow stage model based on the geological data using the normal steam injection stage model.

[0060] In some embodiments, according to the different seepage resistances in the crossflow channel area, the injection-production stage can be divided into three stages: normal steam injection stage, injection-production interference stage, and injection-production crossflow stage. Using the equivalent seepage resistance method, the resistance near the well is equivalent, and the normal steam injection stage model, the injection-production interference stage model, and the injection-production crossflow stage model can be established; specifically, the normal steam injection stage model is first established, and then the injection-production interference stage model and the injection-production crossflow stage model can be derived based on the normal steam injection stage model.

[0061] In some embodiments, during the normal steam injection stage, at the initial stage of steam injection, because the distance between wells is too large or there is only one production well in the formation, the injected steam at this time does not affect the surrounding wells. Using the equivalent seepage resistance method, the flow resistance around the injection well is regarded as a composite radial flow resistance, the inner area is steam phase seepage, and the outer area is water phase seepage, thereby constructing a normal steam injection stage model.

[0062] In some embodiments, a normal steam injection stage model may be constructed according to the following formula:

[0063] ∫p wc dτ=m1∫q w dτ+A1 (1)

[0064] Among them, m1 is the identification curve of the normal steam injection stage, A1 represents the first intermediate variable, and p wc is the casing pressure of the injection well, τ is the time, q w It is the equivalent of cold water injection.

[0065] In some embodiments, A1 and m1 may be calculated according to the following formula.

[0066] A1=ρ w g w (2)

[0067]

[0068] Among them, μ s is the vapor viscosity, B s is the volume coefficient of steam, K s is the effective permeability of steam, L is the length of the horizontal well section, h is the thickness of the oil layer, r w is the radius of the injection well, S is the skin factor, μ w is the viscosity of hot water, B w is the volume coefficient of water, K w is the effective permeability of water, a is the apparent oil leakage radius, ρ w is the density of water, g is the acceleration due to gravity, L w The depth of the injection well fluid level.

[0069] In some embodiments, due to the change of seepage resistance during the displacement process, the expression of m1 is different in different displacement stages (injection-production interference stage, injection-production crossflow stage). Therefore, by deriving and deforming the normal steam injection stage model, the injection-production interference stage model and the injection-production crossflow stage model can be obtained.

[0070] In some embodiments, during the injection-production interference stage, due to the increase in steam injection time, the hot fluid (such as steam) is connected to the production well. The seepage resistance at this stage is the hot steam around the injection well and the crude oil heated in the strip between the injection and production wells. The seepage radius of the inner zone can be obtained based on the equality of the seepage resistance at the interface between the inner zone and the strip, and then a model of the injection-production interference stage is constructed.

[0071] In some embodiments, the above-mentioned construction of the injection-production interference stage model may include:

[0072] The injection-production interference stage model is constructed according to the following formula:

[0073] ∫[p wc -p pc +ρ w g(L p -L w )]dτ=m2∫q w dτ (4)

[0074] Among them, p wc is the casing pressure of the injection well, p pc is the casing pressure of the target production well, ρ w is the density of water, g is the acceleration due to gravity, L p is the dynamic liquid level depth of the target production well, L w is the depth of the injection well liquid level, m2 represents the injection-production interference stage identification curve, q w is the cold water equivalent, and τ is the time.

[0075] In some embodiments, during the injection-production crossflow stage, when the injected hot fluid advances along the high permeability strip, it forms a strip connection with the production well, and the hot fluid injected from the injection well reaches the production well. The seepage resistance in the strip and around the target well group is mainly water phase.

[0076] In some embodiments, the above-mentioned construction of the injection-production crossflow stage model may include:

[0077] The injection-production crossflow stage model is constructed according to the following formula:

[0078] m3∫q w dτ=∫[p wc -p pc +ρ w g(L p -L w )]dτ (5)

[0079] Among them, m3 represents the identification curve of the injection-production crossflow stage.

[0080] In some embodiments, the injection-production interference stage model is derived to obtain an injection-production interference stage identification curve; the injection-production interference stage identification curve may be specifically in the following form:

[0081]

[0082] In some embodiments, R ct is the production-injection ratio, μ o is the viscosity of heavy oil, B o is the volume coefficient of heavy oil, K o is the effective permeability of heavy oil, D is the well spacing between the injection well and the target production well, and b3 is the equivalent width of the high permeability strip.

[0083] In some embodiments, the above-mentioned production-injection ratio may specifically represent the ratio of the liquid production of the target production well to the injection volume of the target production well after splitting, and its unit is m 3 / m 3 .

[0084] In some embodiments, the above production-injection ratio may be specifically in the following form:

[0085] R ct =q o / q s (7)

[0086] Among them, q o is the liquid production of the target production well, q s It is the injection volume of the target production well after splitting.

[0087] In some embodiments, the injection-production crossflow stage model is derived to obtain an injection-production crossflow stage identification curve; the injection-production crossflow stage identification curve may be specifically in the following form:

[0088]

[0089] S102: Divide the injection-production stages according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result.

[0090] In some embodiments, the division results include a charging area, an interference area, and a crossflow area.

[0091] In some embodiments, the injection-production stages are divided according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result, which may include:

[0092] S1: dividing the area above the injection-production interference stage identification curve into an energy charging area;

[0093] S2: dividing the area between the injection-production interference stage identification curve and the injection-production crossflow stage identification curve into an interference area;

[0094] S3: dividing the area below the injection-production crossflow stage identification curve into a crossflow area;

[0095] S4: combining the charging area, the interference area, and the crossflow area to obtain a target plate;

[0096] S5: Taking the target plate as the division result.

[0097] For a specific scenario example, see Figure 2 As shown in the figure, the horizontal axis of the target chart is the production-injection ratio, and the vertical axis is the slope of the injection-production interference stage model and the injection-production crossflow stage model. Therefore, R ct As the horizontal axis value, m2 as the vertical axis value, the injection-production interference stage identification curve is drawn on the target chart; R ct As the abscissa value, m3 as the ordinate value, the injection-production crossflow stage identification curve is drawn on the target chart. Then, the area above the injection-production interference stage identification curve is divided into the charging area; the area between the injection-production interference stage identification curve and the injection-production crossflow stage identification curve is divided into the interference area; and the area below the injection-production crossflow stage identification curve is divided into the crossflow area.

[0098] S103: According to the injection volume of the target production well after splitting, the curve derivative and production-injection ratio of the target production well are obtained.

[0099] In some embodiments, before obtaining the curve derivative and the production-injection ratio of the target production well according to the post-splitting injection volume of the target production well, the method further includes:

[0100] S1: Obtain the total liquid production of the production well, the liquid production of the target production well, and the total injection volume of the injection well;

[0101] S2: According to the total liquid production of the production well, the liquid production of the target production well, and the total injection volume of the injection well, the target production well is split and calculated to obtain the injection volume of the target production well after splitting.

[0102] In some embodiments, according to the total liquid production of the production well, the liquid production of the target production well, and the total injection volume of the injection well, the target production well is split and calculated to obtain the injection volume of the target production well after splitting. When specifically implemented, it may include:

[0103] Calculate the injection volume after splitting of the target production well according to the following formula:

[0104]

[0105] Among them, ∑q represents the total liquid production of the production well, and ∑I represents the total injection volume of the injection well.

[0106] In some embodiments, according to the injection volume after splitting of the target production well, the curve derivative of the target production well is obtained. When implemented specifically, it may include:

[0107] S1: Obtain the connectivity curve of the target production well according to the injection volume after splitting of the target production well;

[0108] S2: Take the derivative of the connectivity curve to obtain the curve derivative of the target production well.

[0109] In some embodiments, a connectivity curve of the target production well is obtained based on the injection volume of the target production well after splitting, including: taking the injection volume of the target production well after splitting as an independent variable, taking the product of the pressure difference between the injection and production wells and time as a dependent variable, constructing a corresponding relationship between the independent variable and the dependent variable, and obtaining the connectivity curve of the target production well; wherein the pressure difference between the injection and production wells refers to the pressure difference between the target production well and the injection well.

[0110] In some embodiments, the derivative of the connectivity curve is obtained to obtain the curve derivative of the target production well, including: selecting the minimum production time period in the connectivity curve as the variation, calculating the slope in the minimum time period using a numerical method, taking one day (24 hours) as the total time, and taking the calculated slope as the curve derivative; for example, see Figure 3 As shown, Figure 3 The dark curve in the figure is the connectivity curve. By differentiating the connectivity curve, we get the curve derivative (light curve). The Δp in the right vertical axis represents the pressure difference between the injection and production wells, Δt represents the time, and ΔpΔt represents the product of the pressure difference between the injection and production wells and the time, which corresponds to the value of the connectivity curve. The left vertical axis corresponds to the value of the curve derivative.

[0111] In some embodiments, the production-injection ratio is obtained based on the post-splitting injection volume of the target production well. When implemented specifically, it may include: using the material balance method to convert the liquid production of the target production well to a volume under the same conditions as the post-splitting injection volume of the target production well, and taking the minimum time period as the standard, comparing the converted liquid production of the target production well with the post-splitting injection volume of the target production well to obtain the production-injection ratio for each time period.

[0112] S104: Identify crossflow according to the curve derivative, the production-injection ratio, and the division result.

[0113] In some embodiments, crossflow is identified according to the curve derivative, the production-injection ratio, and the division result. When implemented specifically, the following may be included:

[0114] S1: combining the curve derivative and the production-injection ratio to obtain target data;

[0115] S2: Detecting the position of the target data in the target plate;

[0116] S3: When it is determined that all the target data are located in the crossflow area in the target plate, it is determined that crossflow has occurred in the target production well during the time period corresponding to the target data.

[0117] In some embodiments, based on the injection volume after splitting of the target production well, the relationship between the curve derivative and the production-injection ratio can be constructed to obtain target data; wherein the target data is a plurality of two-dimensional data (x, y), x specifically represents the production-injection ratio, and y specifically represents the curve derivative. Then, the production-injection ratio in the target data is used as the abscissa value and the curve derivative is used as the ordinate value, and the target data can be mapped in the target map to perform crossflow identification according to the mapping result.

[0118] In some embodiments, after detecting the position of the target data in the target map, the method further includes: when it is determined that the target data is partially located in a crossflow area in the target map, determining that crossflow has occurred in the target production well at a time point corresponding to the target data.

[0119] In some embodiments, if the target data is located in the charging area, it means that the injection-production well is in the charging stage (steam injection stage).

[0120] In some embodiments, if the target data is located in the interference zone, it means that the injection and production wells are in an interference state; when the target production well continues to produce for a period of time, the target data may gradually move to the crossflow zone, which means that crossflow has occurred in the target production well. After crossflow occurs in the target production well, if no measures are taken, crossflow will continue to occur.

[0121] In some embodiments, the target plate can usually only reflect the heavy oil reservoir production situation within a period of time. If all the target data in the target plate are located in the crossflow area, it is impossible to determine the initial time of the crossflow. If part of the target data in the target plate is located in the crossflow area, and part of the target data is located in the charging area and / or the interference area, the target data located in the crossflow area can be screened out, and their production-injection ratio can be further obtained. Through the production-injection ratio, the initial time point of the crossflow can be specifically calculated; from the time point after the initial time point, it can be considered that the crossflow has occurred continuously.

[0122] In some embodiments, after detecting the position of the target data in the target map, the method further includes: determining that no crossflow occurs in the target production well when it is determined that all of the target data are located in the energized area and / or interference area in the target map.

[0123] For a specific scenario example, see Figure 4 As shown, Figure 4 The stars in the figure represent target data. Most of the target data are located in the interference area, and a few of the target data are located in the crossflow area. Therefore, the initial time point of the crossflow can be calculated by screening the target data located in the crossflow area.

[0124] Through the above embodiments, accurate identification of crossflow can be achieved, and the time period when crossflow occurs can be further calculated. According to whether crossflow occurs and the time period when crossflow occurs, corresponding profile adjustment and plugging measures can be taken to suppress crossflow and improve oil reservoir production efficiency.

[0125] Based on the above-mentioned method for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs, this specification also proposes an embodiment of a device for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs, see Figure 5 As shown, the device for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs specifically includes the following modules:

[0126] The first calculation module 501 is used to obtain geological data of the target area; and obtain an injection-production interference stage identification curve and an injection-production crossflow stage identification curve according to the geological data;

[0127] A division module 502 is used to divide the injection-production stage according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result;

[0128] The second calculation module 503 is used to obtain the curve derivative and the production-injection ratio of the target production well according to the injection volume after splitting of the target production well;

[0129] The identification module 504 is used to identify crossflow according to the curve derivative, the production-injection ratio, and the division result.

[0130] In some embodiments, the first calculation module 501, when implemented, can be used to construct an injection-production interference stage model and an injection-production crossflow stage model based on the geological data; and to obtain derivatives of the injection-production interference stage model and the injection-production crossflow stage model, respectively, to obtain an injection-production interference stage identification curve and an injection-production crossflow stage identification curve.

[0131] In some embodiments, the division results include a charging area, an interference area, and a crossflow area.

[0132] In some embodiments, the division module 502, during specific implementation, can be used to divide the area above the injection-production interference stage identification curve into a charging zone; divide the area between the injection-production interference stage identification curve and the injection-production crossflow stage identification curve into an interference zone; divide the area below the injection-production crossflow stage identification curve into a crossflow zone; combine the charging zone, the interference zone, and the crossflow zone to obtain a target map; and use the target map as the division result.

[0133] In some embodiments, the second calculation module 503, when implemented, can be used to obtain the total liquid production of the production well, the liquid production of the target production well, and the total injection volume of the injection well; based on the total liquid production of the production well, the liquid production of the target production well, and the total injection volume of the injection well, the target production well is split and calculated to obtain the injection volume of the target production well after splitting.

[0134] In some embodiments, the second calculation module 503, when implemented, can also be used to obtain a connectivity curve of the target production well according to the injection volume of the target production well after splitting; and to obtain a derivative of the connectivity curve to obtain a curve derivative of the target production well.

[0135] In some embodiments, the identification module 504, when implemented, can be used to combine the curve derivative and the production-injection ratio to obtain target data; detect the position of the target data in the target map; and when it is determined that all of the target data are located in the crossflow area in the target map, determine that crossflow has occurred in the target production well during the time period corresponding to the target data.

[0136] In some embodiments, the identification module 504, when implemented, can also be used to determine that crossflow occurred in the target production well at the time point corresponding to the target data when it is determined that the target data portion is located in the crossflow area in the target map.

[0137] In some embodiments, the identification module 504, when implemented, can also be used to determine that crossflow does not occur in the target production well when it is determined that all the target data are located in the energized area and / or interference area in the target plate.

[0138] It should be noted that the units, devices or modules described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. For the convenience of description, the above devices are described separately by functions divided into various modules. Of course, when implementing this specification, the functions of each module can be implemented in the same or more software and / or hardware, or the modules that implement the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0139] The embodiments of the present specification also provide a computer storage medium for a method for identifying crossflow in steam injection thermal production in a heavy oil reservoir, wherein the computer storage medium stores computer program instructions, which, when executed, achieve the following: acquiring geological data of a target area; and obtaining an injection-production interference stage identification curve and an injection-production crossflow stage identification curve based on the geological data; dividing the injection-production stages based on the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result; obtaining a curve derivative and a production-injection ratio of a target production well based on the injection volume of the target production well after splitting; and identifying crossflow based on the curve derivative, the production-injection ratio, and the division result.

[0140] In this embodiment, the storage medium includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a cache, a hard disk (HDD), or a memory card. The memory may be used to store computer program instructions. The network communication unit may be an interface for network connection communication set in accordance with the standard specified by the communication protocol.

[0141] In this embodiment, the functions and effects specifically implemented by the program instructions stored in the computer storage medium can be explained in comparison with other implementations and will not be described in detail here.

[0142] The present specification also provides a server, including a processor and a memory for storing processor executable instructions. When the processor is implemented, it can perform the following steps according to the instructions: obtain geological data of the target area; and obtain an injection-production interference stage identification curve and an injection-production crossflow stage identification curve according to the geological data; divide the injection-production stage according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result; obtain the curve derivative and the production-injection ratio of the target production well according to the injection volume of the target production well after splitting; identify the crossflow according to the curve derivative, the production-injection ratio and the division result.

[0143] In order to complete the above instructions more accurately, refer to Figure 6 As shown, the embodiment of this specification also provides another specific server, wherein the server includes a network communication port 601, a processor 602 and a memory 603, and the above structures are connected through internal cables so that each structure can perform specific data interaction.

[0144] The network communication port 601 can be used to obtain geological data of the target area.

[0145] The processor 602 can be specifically used to obtain an injection-production interference stage identification curve and an injection-production crossflow stage identification curve based on the geological data; divide the injection-production stage according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result; obtain the curve derivative and the production-injection ratio of the target production well according to the injection volume of the target production well after splitting; and identify the crossflow according to the curve derivative, the production-injection ratio, and the division result.

[0146] The memory 603 may be specifically used to store corresponding instruction programs.

[0147] In this embodiment, the network communication port 601 can be a virtual port that is bound to different communication protocols so that different data can be sent or received. For example, the network communication port can be a port responsible for web data communication, a port responsible for FTP data communication, or a port responsible for email data communication. In addition, the network communication port can also be a physical communication interface or communication chip. For example, it can be a wireless mobile network communication chip, such as GSM, CDMA, etc.; it can also be a Wifi chip; it can also be a Bluetooth chip.

[0148] In this embodiment, the processor 602 may be implemented in any appropriate manner. For example, the processor may take the form of a microprocessor or processor and a computer-readable medium storing a computer-readable program code (such as software or firmware) executable by the (micro)processor, a logic gate, a switch, an application specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller, etc. This specification does not limit this.

[0149] In this embodiment, the memory 603 may include multiple levels. In a digital system, anything that can store binary data can be a memory; in an integrated circuit, a circuit with a storage function but no physical form is also called a memory, such as RAM, FIFO, etc.; in a system, a storage device with a physical form is also called a memory, such as a memory stick, TF card, etc.

[0150] Although the present specification provides method operation steps as described in the embodiments or flow charts, more or less operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiments is only one way of executing the order of many steps, and does not represent a unique execution order. When the device or client product in practice is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, a parallel processor or a multi-threaded processing environment, or even a distributed data processing environment). The term "include", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or device including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such a process, method, product or device. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or device including the elements. The first, second, etc. words are used to represent the name, and do not represent any particular order.

[0151] Those skilled in the art also know that, in addition to implementing the controller in a purely computer-readable program code, the controller can be made to implement the same function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, such a controller can be considered as a hardware component, and the devices for implementing various functions included therein can also be considered as structures within the hardware component. Or even, the devices for implementing various functions can be considered as both software modules for implementing the method and structures within the hardware component.

[0152] This specification may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, classes, etc. that perform specific tasks or implement specific abstract data types. This specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media including storage devices.

[0153] Through the description of the above embodiments, it can be known that those skilled in the art can clearly understand that the present specification can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present specification can essentially be embodied in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a mobile terminal, a server, or a network device, etc.) to execute the methods described in each embodiment of the present specification or some parts of the embodiments.

[0154] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. This specification can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld devices or portable devices, tablet devices, multi-processor systems, microprocessor-based systems, set-top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc.

[0155] Although the present specification is described through embodiments, those skilled in the art will appreciate that there are many modifications and changes to the present specification without departing from the spirit of the present specification, and it is intended that the appended claims include these modifications and changes without departing from the spirit of the present specification.

Claims

1. A method for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs, characterized in that: include: Obtain geological data of the target area; and obtaining an injection-production interference stage identification curve and an injection-production crossflow stage identification curve according to the geological data; According to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve, the injection-production stage is divided to obtain a division result; According to the injection volume after splitting of the target production well, the curve derivative and production-injection ratio of the target production well are obtained; Identifying crossflow according to the curve derivative, the production-injection ratio, and the division result; The injection-production interference stage identification curve is determined by taking the derivative of the injection-production interference stage model constructed according to the geological data, and the injection-production crossflow stage identification curve is determined by taking the derivative of the injection-production crossflow stage model constructed according to the geological data; Wherein, the injection-production stage is divided according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain the division result, including: Combine the charging area, the interference area, and the crossflow area to obtain a target plate, and use the target plate as the division result, the charging area is the area above the injection-production interference stage identification curve, the interference area is the area between the injection-production interference stage identification curve and the injection-production crossflow stage identification curve, and the crossflow area is the area below the injection-production crossflow stage identification curve; The injection volume after splitting of the target production well is calculated by splitting the target production well based on the total liquid production of the production well, the liquid production of the target production well, and the total injection volume of the injection well; Wherein, the curve derivative is obtained by obtaining the connectivity curve of the target production well according to the injection volume of the target production well after splitting, and derivation of the connectivity curve; the production-injection ratio is obtained by comparing the liquid production of the target production well with the injection volume of the target production well after splitting; Wherein, the identifying of crossflow according to the curve derivative, the production-injection ratio, and the division result includes: Based on the injection volume after splitting of the target production well, a relationship between the curve derivative and the production-injection ratio is constructed to obtain target data; The target data is mapped in a target plate to perform cross-flow identification according to the mapping result.

2. The method according to claim 1, characterized in that The injection-production interference stage identification curve and the injection-production crossflow stage identification curve are obtained according to the geological data, including: constructing the injection-production interference stage model and the injection-production crossflow stage model according to the geological data; Derivatives of the injection-production interference stage model and the injection-production crossflow stage model are obtained respectively to obtain the injection-production interference stage identification curve and the injection-production crossflow stage identification curve.

3. The method according to claim 1, characterized in that The division results include a charging area, an interference area, and a crossflow area.

4. The method according to claim 3, characterized in that According to the curve derivative, the production-injection ratio, and the division result, crossflow is identified, including: Combining the curve derivative and the production-injection ratio to obtain the target data; Detecting the position of the target data in the target plate; When it is determined that all the target data are located in the crossflow area in the target plate, it is determined that crossflow has occurred in the target production well during the time period corresponding to the target data.

5. The method according to claim 4, characterized in that After detecting the position of the target data in the target plate, the method further includes: When it is determined that the target data portion is located in the crossflow area in the target plate, it is determined that crossflow occurred in the target production well at the time point corresponding to the target data.

6. The method according to claim 4, characterized in that After detecting the position of the target data in the target plate, the method further includes: When it is determined that all the target data are located in the energizing area and / or the interference area in the target plate, it is determined that no crossflow occurs in the target production well.

7. A device for identifying crossflow in steam injection thermal recovery of heavy oil reservoirs, characterized in that: include: A first computing module, used to obtain geological data of a target area; and obtaining an injection-production interference stage identification curve and an injection-production crossflow stage identification curve according to the geological data; A division module, used to divide the injection-production stage according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain a division result; The second calculation module is used to obtain the curve derivative and the production-injection ratio of the target production well according to the injection volume after splitting of the target production well; an identification module, used for identifying crossflow according to the curve derivative, the production-injection ratio, and the division result; The injection-production interference stage identification curve is determined by taking the derivative of the injection-production interference stage model constructed according to the geological data, and the injection-production crossflow stage identification curve is determined by taking the derivative of the injection-production crossflow stage model constructed according to the geological data; Wherein, the injection-production stage is divided according to the injection-production interference stage identification curve and the injection-production crossflow stage identification curve to obtain the division result, including: Combine the charging area, the interference area, and the crossflow area to obtain a target plate, and use the target plate as the division result, the charging area is the area above the injection-production interference stage identification curve, the interference area is the area between the injection-production interference stage identification curve and the injection-production crossflow stage identification curve, and the crossflow area is the area below the injection-production crossflow stage identification curve; The injection volume after splitting of the target production well is calculated by splitting the target production well based on the total liquid production of the production well, the liquid production of the target production well, and the total injection volume of the injection well; Wherein, the curve derivative is obtained by obtaining the connectivity curve of the target production well according to the injection volume of the target production well after splitting, and derivation of the connectivity curve; the production-injection ratio is obtained by comparing the liquid production of the target production well with the injection volume of the target production well after splitting; Wherein, the identifying of crossflow according to the curve derivative, the production-injection ratio, and the division result includes: Based on the injection volume after splitting of the target production well, a relationship between the curve derivative and the production-injection ratio is constructed to obtain target data; The target data is mapped in a target plate to perform cross-flow identification according to the mapping result.

8. A computer-readable storage medium, characterized in that: Computer instructions are stored thereon, and when the instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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