Methods for controlling high water consumption in fault-block oil reservoirs

Abstract

The present invention provides a method for controlling high water consumption in fault block reservoirs, and the method for controlling high water consumption in fault block reservoirs includes: step 1: conducting potential evaluation and analysis on the target area to identify the high water consumption area; step 2: optimizing the previous high water consumption control mode based on the potential evaluation; step 3: optimizing the stratified scheme; step 4: optimizing the streamline scheme by adopting different streamline optimization methods for different residual oil distribution patterns; step 5: determining the optimal control scheme to achieve the unity of flow field reconstruction to promote sweep and control high water consumption to improve efficiency. The method for controlling high water consumption in fault block reservoirs solves the problem of invalid water circulation caused by factors such as plane and vertical heterogeneity in the late stage of fault block reservoir development, realizes the effective unity of reducing invalid water consumption and redirecting sweep, balanced utilization, and stable production, and promotes the effective improvement of the development quality and development efficiency of fault block reservoirs.

Description

Technical Field

[0001] The invention relates to the technical field of significantly improving water drive recovery rate in a complex fault block oil reservoir with extremely high water content, and in particular to a method for controlling high water consumption in a fault block oil reservoir. Background Art

[0002] The fault-block reservoir has a geological reserve of 1.78 billion tons (37.4% of Shengli Oilfield) and an annual oil production of 7.02 million tons (30.6% of Shengli Oilfield). It is an important type of reservoir in Shengli Oilfield. At present, the comprehensive water content is as high as 93.0%, and it has entered the stage of deep development with ultra-high water content. How to significantly improve the recovery rate and enhance the ability to create profits from reserves has become an important issue facing the development of Shengli fault-block reservoirs. Fault-block reservoirs have the characteristics of complex fault systems, multiple oil-bearing strata, and strong heterogeneity. Affected by them, plane and vertical contradictions run through the development process, especially in the stage of ultra-high water content development. With the intensification of dynamic heterogeneity, injection-production sensitivity, interlayer interference and other problems are prominent, and high water consumption zones and high water consumption layers are formed locally, which restricts the continuous improvement of water drive quality and development benefits.

[0003] Through investigation, in production practice, the use of some advanced development concepts can alleviate the impact of ineffective high water consumption to a certain extent and improve the development effect. However, under the current situation of long-term low oil prices and vigorously creating green enterprises, the previous concepts and methods have shown certain inadaptability and limitations. Method 1: Injection-production coupling control technology. This technology effectively improves the displacement pressure gradient (4 times that of continuous injection and production) by using the method of alternating injection and production of water injection wells and oil production wells without meeting each other, so that the flow line turns from the high water consumption area to the low use area, effectively expanding the water drive sweep volume. However, this method needs to be achieved by shutting down the well, which makes it impossible to maximize the utilization of well resources and increases the difficulty of ground management. Method 2: Artificial strong edge water drive technology. This technology draws on the practical experience of high recovery rate of natural strong edge water drive. By artificially imitating strong edge water, on the one hand, the seepage resistance is uniform in all directions, and displacement without mainstream line is realized, which effectively improves the sweep coefficient. On the other hand, the displacement pressure gradient is increased by increasing the injection intensity, which effectively drives the remaining oil in the tiny pores. However, this method requires effective accumulation of energy to achieve the best effect, and it is difficult to implement with conventional injection-production well networks.

[0004] In the Chinese patent application with application number: CN201910971837.3, a method for regulating stratified water injection in oil reservoirs with high water consumption zones is involved. It includes: step 1, collecting and sorting out the geological and development-related data of the block; step 2, applying the digital modeling method to obtain the stratified development index; step 3, optimizing the evaluation index of the water consumption zone and classifying the high water consumption zone; step 4, combining the development status and the water consumption zone level, selecting the water injection control layer and optimizing the unit stratified water injection; step 5, sorting out the optimization results, improving the stratified water injection control plan, and implementing it on site.

[0005] In the Chinese patent application with application number: CN201910870315.4, a method and system for identifying a water-consuming zone in a high-water-cut oil reservoir are involved. The identification method includes: based on the geological data of the target area in the high-water-cut oil reservoir and the production performance data of the oil wells and water wells in the target area, the production performance of the oil wells and water wells is fitted using a reservoir numerical simulator to obtain a reservoir numerical simulation model; based on the reservoir numerical simulation model, the identification coefficient of the water-consuming zone between each water well and the oil wells located around the water well is calculated; and based on the identification coefficient of the water-consuming zone, the development level of the water-consuming zone is identified.

[0006] In the Chinese patent application with application number: CN201910956366.9, a method for post-controlling water content development in the late stage of water-driven extremely high water content is involved. The method for post-controlling water content development in the late stage of water-driven extremely high water content includes: step 1, determining geological development parameters; step 2, conducting well shut-in and well soaking test; step 3, determining the cost of the mining method; step 4, the timing of changing the development method.

[0007] The above existing technologies are quite different from the present invention and fail to solve the technical problems we want to solve. Therefore, it is necessary to adopt a new method to economically and effectively control high water consumption and further improve the recovery rate of fault block reservoirs in the ultra-high water cut period. To this end, we have invented a new method for controlling high water consumption in fault block reservoirs. Summary of the invention

[0008] The purpose of the present invention is to provide a method for controlling high water consumption in fault-block oil reservoirs, which solves the problem of ineffective water circulation caused by factors such as plane and vertical heterogeneity in the late stage of fault-block oil reservoir development.

[0009] The purpose of the present invention can be achieved by the following technical measures: a method for controlling high water consumption in fault-block oil reservoirs, the method for controlling high water consumption in fault-block oil reservoirs comprising:

[0010] Step 1: Conduct potential assessment and analysis of the target area to identify high water consumption areas;

[0011] Step 2: Based on the potential evaluation, optimize the previous high water consumption management mode;

[0012] Step 3: Optimize the hierarchical solution;

[0013] Step 4: According to different remaining oil distribution patterns, two different flow field control modes, rotational production and injection and rotational production and rest, are adopted;

[0014] Step 5: Determine the optimal control plan parameters, and optimize them during implementation in the mine to ensure optimal benefits.

[0015] The purpose of the present invention can also be achieved by the following technical measures:

[0016] In step 1, a potential evaluation model based on the layer block was constructed. Based on the previous static evaluation of the layer block, the development status, cumulative production and injection, well network conditions and other parameters were integrated to determine the high water consumption layers, high water consumption zones and high water consumption sections, effectively evaluate the water drive development quality of the layer block and the potential for the next adjustment, and clarify the direction of efficient development of fault block oil reservoirs.

[0017] In step 2, the reservoir technologies such as injection-production coupling and artificial strong edge water drive are highly integrated and innovated. The advantages of the separate production and injection process are that the layers can be stopped without stopping the wells, and the layers can be changed without operations. The needs of the reservoir and production are met at the same time, which has made a breakthrough in the problem of high water consumption layers and high water consumption zones in multi-layer fault block reservoirs.

[0018] In step 3, based on the dynamic and static parameters of oil and water wells, differences in reservoir physical properties and remaining oil in the reservoir, reasonable stratification is carried out on the basis of a certain reserve scale and combined with reservoir and process requirements to provide guarantee for subsequent adjustments.

[0019] In step 4, for oil reservoirs with multiple high water consumption layers and overall high water consumption characteristics, the integrated production process and periodic oil production technology form a rotation production and rest adjustment mode.

[0020] In step 4, the rotation production and rest adjustment mode is adopted, that is, multiple high water consumption layers are connected in series by relying on the switch of the production string, and alternate production is carried out, guided by the secondary enrichment mechanism of residual oil, to achieve the unity of benefit mobilization and continuous well opening.

[0021] In step 4, a rotation production and injection adjustment mode is formed for the local high water consumption zones by integrating separate production and injection processes with injection-production coupling and artificial strong edge water drive technology.

[0022] In step 4, the mechanism of injection-production coupling technology to expand the wave and increase the pressure difference is utilized, and staggered-layer coupled injection-production is realized through the string switch, so that the flow field is diverted from the high-water consumption zone to displace the remaining oil in the corners and non-mainstream areas that are difficult to mobilize, thereby realizing differentiated conversion of the flow fields in the upper and lower sections.

[0023] In step 5, the upper and lower flow fields are regulated differently at the same time, and the optimal regulation scheme is determined using numerical simulation technology to achieve the unity of flow field reconstruction to promote waves and control high water consumption to improve efficiency.

[0024] In step 5, the optimal control scheme is determined including the rotation production and injection flow line direction scheme, cycle, liquid production and water injection intensity.

[0025] The method for controlling high water consumption in the fault block reservoir in the present invention relates to a method for controlling local high water consumption layers in the fault block reservoir in the ultra-high water content development stage, which fully integrates and merges the reservoir with the process technology, and utilizes the advantages of stopping the layer without stopping the well and changing the layer without operation in the separate production and separate injection pipe string, and integrates it with injection-production coupling, artificial strong edge water drive and other technologies to form a multi-dimensional coupling flow field control mode, which can achieve continuous well opening and maintain stable production while meeting the requirements of large pressure difference alternation and high displacement pressure gradient on the oil reservoir. The method for controlling high water consumption in the fault block reservoir in the ultra-high water content stage of the present invention solves the problem of invalid water circulation caused by factors such as plane and vertical heterogeneity in the later stage of the development of the fault block reservoir, realizes the effective unification of reducing invalid water consumption and redirecting the spread, balanced mobilization and stable production, and promotes the effective improvement of the development quality and development benefits of the fault block reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of a specific embodiment of the method for controlling high water consumption in fault-block oil reservoirs of the present invention;

[0027] Figure 2 It is a schematic diagram of optimizing the high water consumption area identification method and deepening from a small layer to a single sand body in step 1 of the present invention;

[0028] Figure 3 It is a schematic diagram of the types of high water consumption areas and high water consumption layers, high water consumption zones, and high water consumption sections in step 1 of the present invention;

[0029] Figure 4 It is a schematic diagram of a rotation adjustment mode of one of the optimization of the high water consumption management mode in step 4 of the present invention;

[0030] Figure 5 It is a schematic diagram of the two-round mining and injection adjustment mode of the high water consumption treatment mode optimization in step 4 of the present invention;

[0031] Figure 6 This is a distribution diagram of the remaining oil in the upper and lower layers of Camp 17 West in a specific embodiment 1 of the present invention;

[0032] Figure 7 This is a comparison diagram of the lower streamline before and after turning in a specific embodiment 1 of the present invention;

[0033] Figure 8 A comparison diagram of the upper streamline before and after turning in a specific embodiment 1 of the present invention;

[0034] Fig. 9 This is a residual oil distribution diagram of Camp 26-2 in a specific embodiment 2 of the present invention;

[0035] Fig.10 This is a comparison diagram of the lower streamline before and after turning in a specific embodiment 2 of the present invention;

[0036] Fig.11 A comparison diagram of the upper streamline before and after turning in a specific embodiment 2 of the present invention;

[0037] Fig.12 This is a residual oil saturation distribution diagram in a specific embodiment 3 of the present invention. DETAILED DESCRIPTION

[0038] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations and / or combinations thereof.

[0040] like Figure 1 As shown, Figure 1 The flowchart of the method for controlling high water consumption in fault block oil reservoirs of the present invention is as follows. The method for controlling high water consumption in fault block oil reservoirs comprises the following steps:

[0041] Step 1: Conduct potential evaluation and analysis of the target area to identify high water consumption areas. In the past, potential evaluation focused on small layers, but each small layer has multiple independent oil-water systems and still has a certain degree of imbalance. Therefore, the potential evaluation object is deepened from small layers to single sand bodies, such as Figure 2 As shown in the figure, the evaluation is more refined and accurate. A potential evaluation model based on layer blocks has been constructed. Based on the previous static evaluation of layer blocks, the development status, cumulative production and injection, well network conditions and other parameters are integrated to determine the high water consumption layers, high water consumption zones and high water consumption sections, such as Figure 3 As shown, the water drive development quality and the potential for next adjustment of the block are effectively evaluated, and the direction of profitable development of fault block reservoirs is clarified.

[0042] Step 2: Optimize the high water consumption management mode. Based on the potential evaluation, optimize the previous high water consumption management mode. Injection-production coupling, artificial strong edge water drive and other reservoir technologies are highly integrated and innovated. The advantages of separate production and injection technology are used to stop layers without stopping wells and change layers without operations. At the same time, the needs of reservoirs and production are met, making breakthrough progress in the high water consumption layers and high water consumption zones of multi-layer fault block reservoirs.

[0043] Step 3: Optimize the stratification scheme. Based on the dynamic and static parameters of oil and water wells, the differences in reservoir physical properties and remaining oil, etc., reasonable stratification is carried out on the basis of a certain reserve scale and combined with reservoir and process requirements to provide guarantee for subsequent adjustments.

[0044] Step 4: Optimize the streamline scheme. Different streamline optimization methods are adopted for different residual oil distribution patterns. First, for oil reservoirs with multiple high water consumption layers and overall high water consumption characteristics, the integrated production process and periodic oil production technology form a rotation production adjustment mode. Entering the late stage of ultra-high water content development, some well areas have a high degree of overall flooding, and the continuous production efficiency has deteriorated. In the past, cyclical oil production was mainly achieved by stopping wells or operations to improve development results. However, cyclical oil production has problems such as difficult on-site management and waste of well resources caused by long-term well shutdown. For this reason, a rotation production adjustment mode is proposed, such as Figure 4 As shown, multiple high water consumption layers are connected in series by relying on the "switch" of the production string, and alternate production is carried out, guided by the secondary enrichment mechanism of residual oil, to achieve the unity of benefit mobilization and continuous well drilling.

[0045] Secondly, a rotation production and injection adjustment mode has been formed for local high water consumption zones by integrating separate production and injection processes with injection-production coupling and artificial strong edge water drive technology. With the gradual deepening of water drive development, advantageous channels have been formed between oil and water wells, injection-production sensitivity and other issues have become increasingly prominent, and flow field regulation has become more difficult. In the past, adjustments using injection-production coupling required stopping wells to achieve this. However, the rotation production and injection adjustment mode does not require stopping wells to meet the needs of large pressure difference regulation in oil reservoirs. The connotation of this mode is to use the mechanism of injection-production coupling technology to expand the influence and increase the pressure difference during the local high water consumption stage, and to achieve staggered coupled injection-production through tubing switches, so as to divert the flow field from the high water consumption zone to displace the residual oil in the corners and non-mainstream lines that are difficult to use, and to achieve differentiated diversion of the flow fields in the upper and lower sections, such as Figure 5 shown.

[0046] Step 5: Carry out differential regulation on the upper and lower flow fields at the same time, and use numerical simulation technology to determine the optimal regulation plan, including the direction plan, cycle, liquid production and injection intensity of the rotation production and injection flow lines, so as to achieve the unity of flow field reconstruction to promote waves and control high water consumption to improve efficiency.

[0047] Specific embodiment 1, refer to the attached Figure 6 , 7 , 8, Figure 6 This is a specific embodiment of the present invention, the distribution map of the remaining oil in the upper and lower layers of the west section of Camp 17. The distribution of high water consumption is clarified through the distribution of remaining oil, and the next adjustment object is determined, and the Camp 17-Slant 78 well area is locked; Figure 7 This is a comparison diagram of the streamlines in the lower section before and after turning in a specific embodiment 1 of the present invention, which realizes the streamline turning in the high water consumption area; Figure 8The figure is a comparison diagram of the upper streamline before and after the turning in a specific embodiment 1 of the present invention, which avoids the formation of a new high water consumption streamline on the basis of improving the utilization of the low utilization area; the method of the present invention is described in detail below by taking the West Unit of Camp 17 as an example, and the specific steps are as follows:

[0048] Overview of Ying 17 unit: The geological reserves of this unit are 1.09 million tons, the permeability is 225mD, the comprehensive water content of the target layer Sha 2 10-11 is 87.6%, and the recovery rate is 28.4%. It is a medium-high permeability, normal temperature and pressure, thin oil, and weak edge water block oil reservoir. It currently has medium-high water content and medium oil recovery rate.

[0049] (1) Conduct potential evaluation and analysis on Ying 17 West to identify high water consumption areas. Perform residual oil analysis on each layer and determine high water consumption areas based on numerical simulation results of Ying 17 West. Figure 6 That is, according to the current remaining oil distribution map, the high water consumption zone is determined, and the treatment target is locked in the Ying 17-Xie 78 well area;

[0050] (2) Optimization of high water consumption management mode. To address the problem of high water consumption zones in the unit, the rotational mining and injection mode is adjusted.

[0051] (3) Optimization of the stratification scheme. Through the analysis of reservoir physical properties and monitoring data such as absorption, all oil and water wells were put into separate production and injection strings, with Sha2 10-11 (3) as the upper section and Sha2 11 (4-6) as the lower section.

[0052] (4) Optimization of streamline plan. For the lower section with higher flooding degree, the switches of the lower sections of the oil wells Ying 17-Xie 66, Ying 17-Xie 92, and Ying 17-Xie Geng 51 corresponding to the high water consumption area Ying 17-Xie 78 were closed, and the switches of the lower sections of the water wells were opened to maintain water injection, so that the layers at the ends of the high water consumption wells would not meet. Figure 7 As shown in the figure, the original 30-60 degree mainstream line is changed to flow to the low-use area to the east and south; the rear streamline of the upper section is as follows Figure 8 As shown, by shutting down the water injection switch of Shuijingying 17-Slant 78 in the upper section, the water line is prevented from continuing to advance along the original flow line, thereby strengthening the displacement effect of the edge water wells to the low-utilization area.

[0053] (5) Optimization of program parameters. The optimized rotational production and injection cycle is 19 months, the average daily liquid per well in the upper layer is 20 cubic meters / day, and the injection intensity is 30 cubic meters / day; the average daily liquid per well in the lower layer is 25 cubic meters / day, and the injection intensity is 40 cubic meters / day. After implementation, the unit pressure reduces the amount of inefficient liquid by 136 cubic meters / day, the water content decreases by 3.4%, and the unit operating cost decreases by 71 yuan / ton.

[0054] Specific embodiment 2, refer to the attached Fig. 9 , 10 , 11, Fig. 9This is a residual oil distribution diagram of Camp 26-2 in a specific embodiment 2 of the present invention. The high water consumption distribution is clarified through the residual oil distribution, and the next adjustment object is determined, and the second sand section of Camp 26-2 is locked; Fig.10 This is a comparison diagram of the streamlines in the lower section before and after turning in a specific embodiment 2 of the present invention, which realizes the streamline turning in the high water consumption area; Fig.11 This is a comparison diagram of the upper streamline before and after the turning in a specific embodiment 2 of the present invention, which avoids the formation of a new high-water consumption streamline on the basis of improving the utilization of the low-utilization area; taking the camp 26-1 unit as an example, the method of the present invention is described in detail below, and the specific steps are as follows:

[0055] Overview of Ying 26-2 unit: The geological reserves of this unit are 520,000 tons, the permeability is 525mD, the target layer is Sha 2 1-2, the comprehensive water content is 91.7%, the recovery rate is 20.6%, and it is a high-permeability, normal temperature and pressure, thin oil, weak edge water block oil reservoir, currently with high water content and medium oil recovery rate.

[0056] (1) Conduct potential evaluation and analysis on Ying 26-2 to identify high water consumption areas. Perform residual oil analysis layer by layer. Determine that the high water consumption layer belt is mainly concentrated in Sha 2-2;

[0057] (2) Optimization of high water consumption management mode. To address the problem of high water consumption zones in the unit, the rotational mining and injection mode is adjusted.

[0058] (3) Optimization of the stratification scheme. Through the analysis of reservoir physical properties and monitoring data such as absorption measurement, all oil and water wells were put into separate production and injection strings, with Sha 2 1 as the upper section and Sha 2 2 as the lower section.

[0059] (4) Optimization of flow line scheme. For the lower section with a higher degree of flooding, the switch of the lower section of the oil well camp 26-slant 24 corresponding to the high water consumption area camp 26-slant 25 is closed, and the switch of the lower section of the water well is opened to maintain water injection. At the same time, the switch of the lower section of the oil well camp 26-2 corresponding to the oil well camp 26-slant 23 is opened, and the switch of the lower section of the water well is closed, so that the layers at the high water consumption well end do not meet each other, and the low use section maintains water injection and pulls the flow line, such as Fig.10 As shown; the streamline after the upper section is as follows Fig.11 As shown, by shutting down the water injection switch of the water well camp 26-slope 25 in the upper section, the water line is prevented from continuing to advance along the original flow line, thereby strengthening the displacement effect of the edge water wells to the low-use area.

[0060] (5) Optimization of program parameters. The optimized rotational production and injection cycle is 15 months, the average daily liquid per well in the upper layer is 10 cubic meters / day, and the injection intensity is 20 cubic meters / day; the average daily liquid per well in the lower layer is 20 cubic meters / day, and the injection intensity is 30 cubic meters / day. After implementation, the unit pressure reduces the amount of inefficient liquid by 97 cubic meters / day, the water content decreases by 2.8%, and the unit operating cost decreases by 54 yuan / ton.

[0061] Specific embodiment 3, refer to the attached Fig.12 , Fig.12 It is a schematic diagram of the residual oil saturation distribution diagram and the optimization scheme of the numerical model for related parameters in a specific embodiment 3 of the present invention.

[0062] Taking the symplectic 151 unit as an example, the method of the present invention is described in detail below, and the specific steps are as follows:

[0063] Overview of Xin 151 unit: The unit has a geological reserve of 2.13 million tons, a permeability of 687mD, a target layer of sand and stable, a comprehensive water content of 97.7%, and a recovery rate of 57.8%. It is a high-permeability, normal temperature and pressure, thin oil, and strong edge water block oil reservoir, currently with extremely high water content and high recovery rate.

[0064] (1) Conduct potential evaluation and analysis on Xin 151 unit to identify high water consumption areas. Perform residual oil analysis on each layer. Xin 151 unit has entered the late stage of extremely high water content, and the overall multi-layer has high water consumption;

[0065] (2) Optimization of high water consumption management mode. To address the problem of high water consumption in the unit as a whole, the rotation mode is adjusted.

[0066] (3) Optimization of the stratification scheme. Through the analysis of reservoir physical properties and monitoring data such as absorption measurement, all oil and water wells were put into separate production and injection strings, with Sha Er Wen 2 as the upper section and Sha Er Wen 3 as the lower section.

[0067] (4) Optimization of flow line scheme. In view of the high water content in multiple layers and low continuous production efficiency, the oil reservoir can be rotated for production and rest by leveraging the separation recovery technology. That is, the oil wells are staggered for rest, realizing the organic combination of layer-by-layer production and layer-by-layer rest.

[0068] (5) Optimization of program parameters. The numerical model was used to optimize the shut-in period and reasonable liquid production intensity of each vertical high-water-content layer, quantitatively predict the secondary migration of oil and gas, optimize the separate production period of the separate production wells to 20 months, compare the effects of different liquid production intensities, and optimize the single-layer liquid production to 16 cubic meters / day for the upper layer and 12 cubic meters / day for the lower layer. After implementation, the unit pressure reduced the inefficient liquid volume by 356 cubic meters / day, the water content decreased by 0.9%, and the unit operating cost decreased by 91 yuan / ton.

[0069] The technical idea of ​​the present invention is clear and the application is simple. It provides an important direction for further improving the recovery rate of fault block reservoirs in the ultra-high water content period, and also provides strong technical support for efficient and stable production and green and low-carbon development. After the implementation of this method in the Dongxin Oil Production Plant of Shengli Oilfield, high water consumption zones and high water consumption layers were effectively managed. It was mainly implemented in 22 units or well groups such as Xin 151 and Ying 17 West, covering geological reserves of 23.79 million tons. After adjustment, the average water content dropped by 3.6 percentage points, the inefficient and invalid liquid volume was reduced by 938 cubic meters per day, the operating cost was reduced by 2.67 million yuan, the cumulative oil production was increased by 8,576 tons, and the total economic benefits were 6.999 million yuan.

[0070] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0071] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

Claims

1. A method for controlling high water consumption in fault-block oil reservoirs, characterized in that: The method for controlling high water consumption in fault block reservoirs includes: Step 1: Conduct potential evaluation and analysis of the target area to identify high water consumption areas; construct a potential evaluation model based on layer blocks. Based on the previous static evaluation of layer blocks, the development status, cumulative production and injection, and well network conditions are integrated to determine high water consumption layers, high water consumption zones, and high water consumption sections; Step 2: Based on the potential evaluation, the previous high water consumption management mode is optimized; the injection-production coupling and artificial strong edge water drive technology are integrated, and the separate production and injection process is adopted to stop the layer without stopping the well, and the process of changing the layer without operation; Step 3: Optimize the stratification scheme; Based on the dynamic and static parameters of oil and water wells, the differences in reservoir physical properties and remaining oil in the reservoir, reasonable stratification is carried out on the basis of a certain reserve scale and in combination with reservoir and process requirements; Step 4: Different streamline optimization methods are adopted for different residual oil distribution patterns. For multiple high water consumption layers and oil reservoirs with overall high water consumption characteristics, the integrated production process and periodic oil production technology form a rotation production and rest adjustment mode; the rotation production and rest adjustment mode, that is, relying on the switch of the production string, connects multiple high water consumption layers in series for alternate production, and takes the secondary enrichment mechanism of residual oil as a guide to achieve the unity of benefit mobilization and continuous well opening; A rotation production and injection adjustment mode is formed for local high water consumption zones by integrating separate production and injection processes, injection-production coupling, and artificial strong edge water drive technology. Adjustment by injection-production coupling requires stopping wells to achieve, while the rotation production and injection adjustment mode does not require stopping wells to meet the needs of large pressure difference regulation in oil reservoirs. The rotation production and injection adjustment mode uses the mechanism of injection-production coupling technology to expand the influence and increase the pressure difference during the local high water consumption stage, and realizes staggered coupled injection and production through the string switch, so as to divert the flow field from the high water consumption zone to displace the residual oil in the corners and non-mainstream lines that are difficult to use, and realize differentiated diversion of the flow field in the upper and lower sections. Step 5: The upper and lower flow fields are differentially regulated simultaneously, and the optimal regulation scheme is determined using numerical simulation technology, including the flow line redirection scheme, cycle, liquid production and injection intensity of the rotational production and injection, so as to achieve the unity of flow field reconstruction to promote waves and control high water consumption to improve efficiency.

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