Water injection development water control method and device for heterogeneous reservoir

Abstract

The application discloses a water injection development water control method and device for a heterogeneous reservoir. The method comprises the following steps: selecting water control objects from horizontal oil wells of the reservoir according to the positional relationship between a well trajectory and a high-permeability layer, water content and a recovery degree, and classifying and sequencing the water control objects; preliminarily identifying the water flow channel direction and a remaining oil enrichment position based on comparison of resistivity curves of the water control objects and a through road well, and determining the water flooded degree and the water saturation before water injection of each water control object; updating the remaining oil enrichment position knowledge through dynamic fitting based on the preliminary identification result and monthly data of the oil and water wells, and adjusting the classification and sequencing in combination with the water flooded degree; determining the current liquid accumulation amount based on the water saturation before water injection of the water control objects and injection and production data; formulating an implementation sequence of water control measures, adjusting the working system of the water control objects, and determining the ratio of the liquid accumulation amount to the water production as a predicted liquid drainage time for the adjusted water control objects. The method realizes "zero cost" quality improvement and efficiency increase of the heterogeneous reservoir by using differential adjustment of the working system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water control technology for high water cut level wells in heterogeneous reservoirs, and particularly relates to a water control method and device for water injection development in heterogeneous reservoirs. BACKGROUND

[0002] In the Middle East, most of the oil-bearing reservoirs are strong heterogeneous layered limestone reservoirs, and high-permeability thief zones are generally developed at the top, which causes the water injected from the lower part of the reservoir (straight well or horizontal well) to rapidly channel into the upper part of the reservoir, and then rush to the top of the reservoir along the high-permeability strip. The water is mainly maintained in the upper high-permeability layer, and the injection water is generally "lifted" or "water cone" is inverted. The sweep efficiency of the lower part of the reservoir is very low, and the remaining oil development potential is large. Most of the heterogeneous reservoirs use the development mode of horizontal well top production and bottom injection. Due to the development of a thin high-permeability layer at the top, the water-free oil production period of the horizontal production well is short after water injection development, and the water cut rises rapidly after water breakthrough. It is difficult to stabilize and control water in the middle and late development stages, and effective water control measures are urgently needed to achieve stable and increased production. SUMMARY

[0003] In order to at least partially solve the technical problems existing in the prior art, the present application is made by the inventors, and through specific embodiments, a water control method and device for water injection development in heterogeneous reservoirs are provided, which can realize "zero-cost" quality improvement and efficiency increase of heterogeneous reservoirs by using differential working system adjustment.

[0004] In a first aspect, an embodiment of the present application provides a water control method for water injection development in a heterogeneous reservoir, comprising:

[0005] Step S11, selecting a water control object from the reservoir horizontal oil well according to the positional relationship between the well trajectory and the high-permeability layer and the water cut and the recovery degree included in the single-well dynamic development data, and classifying and sorting the water control object;

[0006] Step S12, obtaining a preliminary identification result of the water flow channel direction and the remaining oil enrichment position based on the comparison with the resistivity curve of the through road well, and determining the watered-out degree and the water saturation before water injection of each water control object;

[0007] Step S13, updating the understanding of the remaining oil enrichment position by fitting a dynamic numerical model based on the preliminary identification result and the monthly data of the oil and water wells, and adjusting the classification and sorting of the water control object in combination with the watered-out degree;

[0008] Step S14, determining the current liquid loading amount of the water control object based on the water saturation before water injection and the injection and production data of the water control object;

[0009] Step S15, based on the adjusted classification and sorting of the water control objects, the water control measures implementation sequence and the water control measures of each water control object are formulated, for the water control object after implementing the water control measures, the water production of the water control object is determined, the ratio of the accumulated liquid volume to the water production is determined as the predicted drainage time, and the water control measures are adjusting the work system.

[0010] In a second aspect, the embodiments of the present application provide a water control method for water injection development of a heterogeneous reservoir, comprising: using the water control method for water injection development of a heterogeneous reservoir as described above to control water during the water injection development of the heterogeneous reservoir.

[0011] In a third aspect, the embodiments of the present application provide a water control device for water injection development of a heterogeneous reservoir, comprising:

[0012] The water control object preliminary screening and classification module is configured to screen water control objects from the horizontal oil wells of the reservoir according to the positional relationship between the well trajectory and the high permeability layer and the water cut and the recovery degree included in the single-well dynamic development data, and perform classification and sorting.

[0013] The water flooded feature analysis module is configured to obtain a preliminary identification result of the water flow channel direction and the remaining oil enrichment position based on the comparison with the resistivity curve of the through road well, and determine the water flooded degree and the water saturation before water injection of each water control object.

[0014] The water control object classification and sorting optimization module is configured to update the understanding of the remaining oil enrichment position by fitting a dynamic numerical model based on the preliminary identification result and the monthly data of the oil and water wells, and adjust the classification and sorting of the water control objects in combination with the water flooded degree.

[0015] The accumulated liquid volume calculation module is configured to determine the current accumulated liquid volume of the water control object based on the water saturation before water injection of the water control object and the injection and production data.

[0016] The water control measure formulation module is configured to formulate a water control measure implementation sequence and water control measures for each water control object based on the adjusted classification and sorting of the water control objects, determine the water production of the water control object after implementing the water control measures, and determine the ratio of the accumulated liquid volume to the water production as the predicted drainage time, wherein the water control measures are adjusting the work system.

[0017] In a fourth aspect, the embodiments of the present application provide a computer storage medium, the computer storage medium stores computer executable instructions, and the computer executable instructions are executed by a processor to implement the water control method for water injection development of a heterogeneous reservoir.

[0018] In a fifth aspect, the embodiments of the present application provide a server, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the water control method for water injection development of a heterogeneous reservoir when executing the program.

[0019] The beneficial effects of the above technical solutions provided by the embodiments of the present application at least include:

[0020] (1) The non-homogeneous reservoir water injection development water control method provided by the embodiments of the present application, through the implementation of steps S11 to S15, analyzes the development law and dynamic characteristics, diagnoses the water-out condition and identifies the water flow channel, describes the remaining oil distribution, calculates the wellbore fluid accumulation and drainage time, and designs and implements the water control measures for the high water cut level well. The method provides a new water control method and process for the high water cut level well in the non-homogeneous reservoir, thereby continuously controlling the water content of the oil well and increasing the oil production of the single well.

[0021] (2) Since the horizontal well is mostly open hole completion and the wellbore integrity is not enough, the water plugging and profile control technology has high implementation cost, great process difficulty, and short oil increasing period. The non-homogeneous reservoir water injection development water control method provided by the embodiments of the present application does not need any measures and construction, and does not increase additional operation cost. After diagnosing the remaining oil enrichment layer, the method excludes the fluid accumulation in the high permeability layer and improves the production in the low permeability layer by reasonably adjusting the oil and water well operation system, and uses the differential adjustment measures to fully tap the remaining oil potential of the high water cut well and improve the reservoir development effect. It is a new type of high water cut level well treatment method, and can realize the "zero cost" quality improvement and efficiency increase of the non-homogeneous reservoir.

[0022] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and achieved by the structures particularly pointed out in the written description, claims, and drawings.

[0023] The technical solutions of the present application will be further described in detail below with the help of the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0025] Figure 1 It is a flow chart of the non-homogeneous reservoir water injection development water control method in the embodiment one of the present application;

[0026] Figure 2 It is a top production and bottom injection mode diagram of the horizontal well row-shaped well pattern in the embodiment two of the present application;

[0027] Figure 3 It is a water content distribution diagram of the Kh2 reservoir in the embodiment two of the present application;

[0028] Figure 4Saturation change monitoring (vertical well) for two years and four years of water injection in the typical horizontal injection-production well group in Example Two of the present application;

[0029] Figure 5 High water cut day and well trajectory correlation graph for high water cut well in Example Two of the present application;

[0030] Figure 6 High water cut day and well trajectory correlation graph for high water cut well in Example Two of the present application;

[0031] Figure 7 Five-point method alternating water cut curve graph for AD1-11 production well in Example Two of the present application;

[0032] Figure 8 AD1-13-4H water cut change curve (actual measurement and numerical simulation prediction trend) graph in Example Two of the present application;

[0033] Figure 9 AD1-11-3H liquid lifting and injection reduction and basic scheme flow line comparison graph in Example Two of the present application;

[0034] Figure 10 Structure schematic diagram of water injection development water control device for heterogeneous reservoirs in the present application. DETAILED DESCRIPTION

[0035] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0036] It should be understood that the terms described in the present application are only for describing specific embodiments and are not intended to limit the present application. In addition, for the numerical range in the present application, it should be understood that each intermediate value between the upper limit and the lower limit of the range is also specifically disclosed. Each smaller range between any stated value or intermediate value within the stated range and any other stated value or intermediate value within the stated range is also included in the present application. The upper limit and the lower limit of these smaller ranges can be independently included or excluded from the range.

[0037] Unless otherwise indicated, all technical and scientific terms have the same meaning as those one of ordinary skill in the art of the application would understand. Although preferred methods and materials are described, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application. All documents mentioned herein are incorporated by reference to disclose and describe in full the methods and / or materials useful in connection to the documents. In case of conflict between the content of the specification and that of any document incorporated herein by reference, the content of the specification prevails.

[0038] The inventors found that the well trajectory generally penetrates the layer in the thin-layer heterogeneous reservoir, by studying the production dynamic characteristics of different types of oil wells penetrating the layer, with the help of the water flooded layer logging interpretation data of the passing well, the water flooded characteristics in the plane and the vertical direction are analyzed, the water flooded law affected by the high permeability thief zone is determined, the different small layer production conditions and the remaining oil distribution characteristics are determined, the influence of the matching relationship of the horizontal well trajectory on the rapid rise of water content is selected, and the well group or single well suitable for adjustment is selected, through the application of the theoretical calculation formula of the liquid accumulation in the wellbore of the horizontal well and the prediction formula of the drainage time, for different well groups or single wells, the drainage time of the accumulated liquid in the wellbore trajectory of the high permeability zone is calculated, through the adjustment of the injection and liquid distribution of the oil and water wells, the swept and produced range of the horizontal well section in the non-high permeability layer position is expanded, so that the purpose of reducing the water content and increasing the production of the high water content oil well is realized.

[0039] Example one

[0040] The embodiment one of the application provides a water injection development water control method for a heterogeneous reservoir, and the flowchart thereof is shown in the figure, which comprises the following steps: Figure 1 The steps are as follows:

[0041] Step S11: According to the position relationship between the well trajectory and the high permeability layer and the water content and the recovery degree included in the single well dynamic development data, the water control object is selected from the reservoir horizontal oil well, and classification and sorting are performed.

[0042] Firstly, according to the single well dynamic development data, the production well development effect and the water content change law are analyzed, the differences in the single well effect are determined, the development indexes such as water content, cumulative oil production and recovery degree are counted, the single well water content and recovery degree curve is drawn according to the water content and the recovery degree included in the single well dynamic development data, and the classification analysis is performed, the water content rising type of the reservoir horizontal oil well is classified according to the curve characteristics, which is divided into the slow water content rising type (type 1), the rapid water flooded and high water content slow rising type (type 2), the rapid water flooded and high water content slow rising type (type 3), the sudden water flooded and high water content slow rising type (type 4) and the sudden water flooded and high water content rapid rising type (type 5), and the above types can be further divided.

[0043] The corresponding relationship between the water cut rising type and the influencing factors, including high permeable layer, fracture, high viscosity oil, bottom water and well trajectory, is determined.

[0044] Based on the classification results of the water cut rising type and the corresponding relationship between the water cut rising type and the influencing factors, the water control objects are selected from the horizontal oil wells in the reservoir according to the position relationship between the well trajectory and the high permeable layer and the water cut, and the classification and the difficulty degree of the regulation and control are performed.

[0045] Type 1: the water cut slowly rising type is closely related to the avoidance of the high permeable layer by the horizontal well trajectory, Type 2: the fast water flooding + high water cut slowly rising type is closely related to the 1 / 4-1 / 3 oblique penetration of the high permeable layer by the horizontal well trajectory, Type 3: the fast water flooding + water cut quickly rising type is closely related to the 1 / 3-2 / 3 well trajectory close to the high permeable layer, Type 4: the sudden channeling water flooding + high water cut slowly rising type is closely related to the high viscosity oil and the 2 / 3 well trajectory close to the high permeable layer or above the high permeable layer, and Type 5: the violent water flooding + high water cut quickly rising type is usually the horizontal well located in the fracture bottom water area and the oil leakage during the drilling process. In terms of the difficulty degree of the water control, Type 1> Type 2> Type 3> Type 4> Type 5, and in terms of the remaining potential, the current production situation is combined, and the production degree of the single well before the water control is mainly considered. In general, the oil well development effect is better in Type 1, and the water control is not needed at the present stage, and the water control in Type 5 is difficult to be artificially intervened due to the influence of the fracture and the natural bottom water, and is not within the range of the water control. On this basis, the oil wells with the water cut more than 80% and more than 90% in Type 2, Type 3 and Type 4 are taken out as the objects of the regulation and control of the high water cut wells, the main control factors and the potential of the water cut rising of the high water cut wells are determined by using the reservoir engineering analysis means, the geological reserve production degree is taken as the remaining potential index, and the selected water control oil wells are classified:

[0046] (1) the horizontal oil well with the water cut greater than 90%, the geological reserve production degree less than 15% and the well trajectory obliquely penetrating the high permeable layer is taken as a first type of water control object.

[0047] (2) the horizontal oil well with the water cut not greater than 90%, the geological reserve production degree less than 20% and the well trajectory obliquely penetrating the high permeable layer is taken as a second type of water control object.

[0048] (3) the horizontal oil well with the water cut not greater than 90%, the proportion of the well trajectory in the high permeable layer greater than a set proportion or the distance between the well trajectory and the high permeable layer less than a set distance is taken as a third type of water control object.

[0049] That is, the horizontal oil well with the water cut not greater than 90% and the well trajectory mostly in the high permeable layer or close to the high permeable layer is taken as a third type of water control object.

[0050] (4) The horizontal well with water content not more than 90% and well trajectory above the high permeability layer is taken as a water control object of type 4.

[0051] The water control of the above-mentioned type 4 is from easy to difficult, and the remaining potential is from large to small, which provides priority for subsequent regulation.

[0052] Step S12: Based on the comparison with the resistivity curve of the passing well, the preliminary identification result of the water flow channel direction and the remaining oil enrichment position is obtained, and the water flooded degree and the water saturation before water injection of each water control object are determined.

[0053] In step S11, several types and potential sizes of high water content horizontal wells are determined, and the water flow channel direction and the remaining oil enrichment position are identified in step S12.

[0054] The passing well corresponding to each water control object is determined, the passing well is a well drilled in the same reservoir and the resistivity curve collection time is later than that of the corresponding water control object, and the passing well is connected with the corresponding water control object in the reservoir.

[0055] Due to the cost of logging, the same well may only collect logging data once; if the same horizontal well collects logging data multiple times, it can also be the comparison of logging curves of the same well.

[0056] A multi-dimensional three-dimensional water flooded layer quantitative interpretation model based on clustering sample learning is established, the water flooded characteristics are studied by using the difference of well logging resistivity of the passing well drilled in the target reservoir in different time periods and before water injection, and the water flooded mode and the injected water migration direction are determined. When comparing, the logging curve is transformed by referring to the layering result of each well to ensure that the top and bottom surfaces of the curves of the new and old wells are aligned.

[0057] When the resistivity of the new and old wells is more than 20% different, it is determined that the layer is water flooded. According to this standard, all the passing wells are analyzed, classified according to the water flooded characteristics, and the water flooded mode is summarized. Combined with the analysis of the horizontal distribution position of the high water content well in step S11, the water flow dominant channel direction of these high water content wells, the water content rising reason and mechanism are determined, the water flooded degree of the water flooded layer is from qualitative analysis to quantitative evaluation, and the water flooded characteristics of the horizontal well differentiation injection under different main control factors are determined. For example: in the reservoir with high permeability layer developed at the top and relatively good physical property at the layer position of the injection well, the horizontal well development mode of top production and bottom storage, affected by the high permeability thief layer, the main and secondary water flow channels exist in the "double inverted water cone" water flooded mode between the injection and production well groups, affected by the well trajectory, the horizontal plane remaining oil is unevenly distributed, and the vertical remaining oil is enriched in the lower part of a small layer. The high permeability layer is the channel of the injected water ineffective and inefficient circulation, and in the injection and production process, the injected water is easily concentrated near the high permeability layer of the horizontal well bore.

[0058] Through step S12, the water flow channel trend and the preliminary identification result of the remaining oil enrichment position are obtained, the water-out degree and the water saturation before water injection of each water control object are determined, but only the values of some monitoring points cannot fully support the judgment of the whole well area of the water control object well.

[0059] Step S13: Based on the preliminary identification result and the monthly data of the oil and water wells, the understanding of the remaining oil enrichment position is updated through the fitting of the dynamic numerical model, and the classification and ranking of the water control object are adjusted in combination with the water-out degree.

[0060] The monthly data of the oil and water wells is loaded into the dynamic numerical model by means of numerical simulation, the preliminary identification result obtained in step S12 is combined, the oil production, water content and pressure of the whole area and single well are fitted, and the saturation monitoring of the passing well points at different times is also fitted, the remaining oil enrichment position of the reservoir is determined according to the fitting result; the intersection relationship between the horizontal section of the water control object and the high permeability layer and the remaining oil enrichment position is analyzed, and the classification and ranking of the water control object are adjusted in combination with the water-out degree.

[0061] The water control objects of the high water content wells screened out in step S11 are marked in the dynamic model, the remaining oil plane and profile distribution drawings of these wells are obtained from the model, and the remaining oil enrichment position is determined. After a long time of water injection development, the scouring multiple of the high permeability layer is high, the water-out degree of the high permeability layer and the next high permeability layer above the high permeability layer is high, and the lower layer system which has large physical property difference with the high permeability layer has low water-out degree, low producing degree and large remaining oil potential, which is the main remaining oil enrichment position. Whether there is intersection relationship between the remaining oil enrichment position, the high permeability layer and the horizontal section of the horizontal well is further implemented, if all the three exist intersection relationship, the judgment of step one is kept as the 1st or 2nd water control object, and the 3rd and 4th water control objects can also be optimized and adjusted or excluded potential according to the result. For example, if the trajectory of the horizontal well section through the high permeability layer is less than 1 / 4 of the length of the horizontal section and 1 / 2 of the section is located below the low permeability position of the high permeability layer, the exploitation index also indicates that the potential tapping is large, then it can be used as the key optimization and adjustment object.

[0062] In the foregoing step, the water control potential ranking well is comprehensively determined, and the wellbore fluid accumulation position of the research well is judged and the fluid accumulation amount is calculated through the theoretical calculation formula.

[0063] Step S14: Based on the water saturation before water injection of the water control object and the injection and production data, the current fluid accumulation amount is determined.

[0064] Generally in heterogeneous reservoir, the liquid accumulation is mainly concentrated in the part of the horizontal well section passing through the high permeability layer, but this method is not very accurate, and in the embodiment of the application, a horizontal well multi-section liquid production well test interpretation model is adopted to accurately identify the water breakthrough position, and then a horizontal well liquid accumulation theoretical formula is used to calculate the instantaneous single well liquid accumulation amount, the formula is centered on the oil well, directly opposite the injection well to supply the injection amount, considers the influence of the high permeability layer water flooded volume in the early stage and the liquid discharge amount of the oil well during the treatment, and deduces the liquid accumulation residual amount near the horizontal wellbore at the tth day, based on a large amount of oil well treatment experience, when the liquid accumulation residual amount is 1 / 2 or 2 / 3 of the original liquid accumulation amount, the water cut has already shown a significant downward trend, since there are differences between single wells, appropriate fine tuning can be carried out according to the change trend. The formula can also calculate the liquid discharge time under constant injection and liquid production speed.

[0065] Step S15: Based on the adjusted classification and sorting of the water control objects, the implementation sequence of the water control measures and the water control measures of each water control object are formulated, the water production of the water control object after the implementation of the water control measures is determined, and the ratio of the liquid accumulation amount to the water production is determined as the predicted liquid discharge time.

[0066] The water control measure is to adjust the work system.

[0067] Based on step S14, the liquid accumulation amount near the current wellbore is calculated, and the work system adjustment scheme corresponding to the oil and water well adjustment is adjusted. When the water cut of the oil well is high, there are four schemes: reducing the injection amount, reducing the liquid production amount, reducing the injection amount + reducing the liquid production amount, and reducing the injection amount + increasing the liquid production amount. For scenario 1: the oil well with rapid water cut rise (water cut is monitored every day) and high pressure level, the injection amount is reduced + the liquid production amount is increased, for scenario 2: the oil well with rapid water cut rise and low pressure level, the injection amount is reduced + the liquid production amount is reduced, for scenario 3: the oil well with rapid water cut rise and medium pressure level, the injection amount is reduced, and for scenario 4: the oil well with water cut rise and low pressure, the liquid production amount is reduced. The adjustment range of the oil well should consider the upper and lower limits of the electric pump oil well, and the injection well should consider the corrosion effect. The minimum injection amount is not less than 100 barrels / day, and the best injection amount should control the injection-production ratio of the current well group to be within 0.95. After selecting different water control measures, the liquid production amount of the oil well can be determined, and the water production amount can be calculated through water cut test. The ratio of the liquid accumulation amount to the water production is determined as the predicted liquid discharge time.

[0068] The non-homogeneous reservoir water injection development water control method provided by the embodiment one of the application, through the implementation of steps S11 to S15, the development law and dynamic characteristics of the high water cut level oil well are analyzed, the water flooded condition is diagnosed and the water flow channel is identified, the remaining oil distribution is described, the wellbore liquid accumulation and the liquid discharge time are calculated, and the water control measure design and implementation are carried out. The method provides a new type of water control method and process for the high water cut level well in the heterogeneous reservoir, so as to continuously control the water cut of the oil well and increase the single well oil production.

[0069] Since the horizontal well is mostly open hole completion and the wellbore integrity is not enough, the water plugging and profile control technology has high implementation cost, great process difficulty and short oil increment effective period, the heterogeneous reservoir water injection development water control method provided by the embodiment one of the present application does not need to perform any measures and construction and will not increase additional operation cost, after diagnosing the remaining oil enrichment layer, the high-permeability layer fluid accumulation is excluded and the low-permeability layer is improved by reasonably adjusting the oil and water well operation system, the differential adjustment countermeasures are used to fully tap the remaining oil potential of the high water cut oil well and improve the reservoir development effect, and the present application is a new type of high water cut horizontal well treatment method, and can realize the "zero cost" quality improvement and efficiency increase of the heterogeneous reservoir.

[0070] In some embodiments, further comprising, for the water control object after implementing the water control measure, repeating steps S14 in a week to determine the change of the fluid accumulation amount, monitor the change of the water cut, update the predicted drainage time and evaluate the water control effect; if the water control effect does not reach the set effect, modifying the current water control measure.

[0071] In some embodiments, further comprising, repeating steps S11-S15 in a month, the new water control object selected does not include the horizontal oil well which has taken the water control measure.

[0072] After the water control object wells are selected in a month through steps one, two and three, the test water cut of the wells after the regulation is monitored and the water control effect is evaluated in a week, the calculation process of steps four and five is cycled to determine the instantaneous fluid accumulation amount and the drainage time, the scheme of step five needs to be adjusted in time in different four scenarios, and the water control effect is observed by continuously testing the water cut of the single well. The above is the step for the water control object well proposed in the last month to implement subsequently. When the water control object is selected to implement in the next month, the water control object well in the last month is removed from step one, and then the classification adjustment is updated to determine whether there is a new water control object well, if there is a new water control object well, the water control measure is designed and implemented according to steps two, three, four and five, and the weekly processing flow.

[0073] Embodiment two

[0074] The embodiment two of the present application provides a specific application of the heterogeneous reservoir water injection development water control method, which is implemented in a certain heterogeneous carbonate reservoir in an oilfield (the embodiment two of the present application is applied to the heterogeneous carbonate reservoir in the oilfield). Figure 2 ), the pilot test of water injection was started in 2012, the scale water injection development was realized at the end of 2014, the oil well water cut rapidly rises to 40-60% after water injection due to the influence of the high-permeability layer developed in the whole region, the comprehensive water cut is 65.9%, the geological recovery degree is 13.2%, the water cut of 33 oil wells is more than 80%, and it is difficult to stabilize oil and control water.

[0075] As of February 2021, 54 wells were opened in the AD1 area, of which 13 had water content greater than 90%, mainly in the alternate test area and its south; 13 had water content between 80% and 90%, located in the fracture area, test area and east side. 23 wells were opened in the AD2 area, of which 3 had water content greater than 90%, 2 located in the alternate test area; 2 had water content between 80% and 90%, 1 located in the test area. 30 wells were opened in the AD4 area, of which 2 had water content greater than 90%. See Figure 3 According to step S11, the objects of high water content treatment and urgent adjustment are sorted out.

[0076] The above-mentioned 33 wells in the three blocks of the typical reservoir are selected as the treatment objects of high water content wells, and AD1 area is selected as the typical area. Through the analysis of the vertical and planar water-flood characteristics of the passing wells, the saturation change of the typical horizontal injection-production well group is monitored for two years and four years after water injection, which can be seen that: the water-flood of high permeability layer Kh2-1-2L and the top of Kh2-2 is obvious, the water-flood degree of Kh2-3 is second, and the water-flood of Kh2-1-2U is different due to the position; after two years of water injection, the whole well section of the injection well is water-flooded, after four years of water injection, the middle well point of the injection well and the production well and the production well are mainly water-flooded in Kh2-3 and high permeability layer, Kh2-1-2U and the upper part of Kh2-2, and the water-flood degree of kh2-2 is lower, see Figure 4 From the distribution of horizontal production well trajectories, more than 75% of the well trajectories of oil wells pass through high permeability layers or large sections of high permeability layers above the high permeability layers, and the injection water flow rules of this part of the production wells are similar to those of the typical well group in Figure 4 The proportion of horizontal production well trajectories located in the middle and lower parts of kh2-2 is only 23.5%, which is mainly unevenly distributed, and has less influence on the overall injection water flow rule.

[0077] The above-mentioned 18 ultra-high water content wells need to clarify the reasons for the rapid rise of water content to ultra-high water content, classify them from the causes of high water content, and determine three main causes:

[0078] 1: 8 wells with water content exceeding 80% or even 90% after the well is shut down and restarted

[0079] 2: 12 wells with periodic changes during five-point alternating injection and production

[0080] 3: 13 wells with water content rising due to the influence of surrounding shut-down wells

[0081] Therefore, the initial rise of water content is mainly affected by the main control factors. Under the current condition of high water-flood degree of high permeability layer, the change of water content mainly depends on the matching relationship between the horizontal well trajectory and the high permeability layer, and the influence of surrounding injection well injection and production intensity, shut-down well and other factors.

[0082] Currently, the main controlling factors for high water-cut oil wells (>90%) are high-permeability layers and well trajectory. The well trajectory penetrates high-permeability layers multiple times or is close to high-permeability layers. The water saturation near the well trajectory is relatively high, and the resulting water flow dominance channels hinder the displacement of the surrounding remaining oil. The causes of the three types of high water-cut wells are analyzed in detail below (Table 1).

[0083] Table 1. Analysis of the reasons for the increase in water cut after well shutdown and resumption of production.

[0084]

[0085] Category 1: High water cut after well shutdown and resumption of production

[0086] The analysis focuses on seven shut-down and resumed production wells with water cut exceeding 90% in 2020. The main controlling factors were high-permeability layers and well trajectory. The cumulative oil production ranged from 1.38 million to 2.27 million barrels. The water cut was basically stable for a period of time, exceeding 95%. The recovery rate of individual wells ranged from 10.9% to 40.1%, and the recovery rate of well groups ranged from 10.0% to 35.0%.

[0087] A comparative study of 26 shut-in wells and their subsequent resumption of production revealed that 15 wells resumed production in zone AD1, 3 wells in zone AD2 resumed production in 2020, and 6 wells resumed production in zone AD4. The duration of high water cut was related to well trajectory and water retention rate. Higher single injection and cumulative injection volumes during shutdown led to higher water retention rates. Wells located in areas significantly affected by high-permeability layers showed a more pronounced increase in water cut after resumption, resulting in a longer period of high water cut and a longer time for drainage and water control. Figure 5 and Figure 6 ).

[0088] Category 2: Water content fluctuations increase during the five-point alternation period.

[0089] The alternation test area in AD1 mainly selected oil wells with a water cut of about 80% before the test for alternation. This alternation mode will produce a water cut high point during the alternation process (Table 2).

[0090] Table 2. Data on water-bearing fluctuations and rises during the five-point alternation method.

[0091]

[0092] Taking AD1-11 as an example, the high water cut point is located before the alternating well opening and shut-in, which may be caused by factors such as short adjustment cycles for oil wells and water wells. See [link / reference]. Figure 7 .

[0093] The same rule can also be seen by numerical simulation. When the five oil wells are shut down, but the injection wells still maintain injection, the opening is similar to the re-production of shut-down wells, and water cut breakthrough occurs, followed by the discharge of injected water during shut-down, and the water cut begins to decline. The 9-13 row of AD1 area has been alternating injection and production for one year, and the water control effect gradually deteriorates in the later period. Before rotation, some wells have a phenomenon of rising water cut, indicating that diagonal channels have been formed. Figure 8 .

[0094] The third type of surrounding oil well shut-down

[0095] In recent years, affected by the shut-down of surrounding oil wells and the continuous injection of water wells, the water cut of some wells has broken through in a short time. The main control factor of these wells is also high permeability layer, and the well trajectory is close to the high permeability layer, which is more affected by the surrounding water wells (Table 3).

[0096] Table 3 High water cut wells caused by surrounding oil well shut-down

[0097]

[0098] For the above-mentioned high water cut well types, in the current pressure recovery situation, the adjustment strategy of liquid lifting and injection reduction is implemented. Through step four, the wellbore liquid accumulation and the liquid discharge time under the current electric pump working system are calculated, and the preliminary scheme of single well adjustment is determined through step five. The effect of liquid lifting and injection reduction is predicted by a numerical simulator. Figure 9 After the implementation of each scheme for a period of time, the water cut of the production well is obviously advanced, and the single well static pressure is higher than the base scheme, liquid lifting, injection reduction, and liquid lifting + injection reduction. The pressure drop can be accepted. At the same time, through the method of liquid lifting and injection reduction, the flow line of some oil wells can be improved, the reserves in the lower part of Kh2-2 with low oil saturation can be developed, and the purpose of water reduction can be achieved.

[0099] For high water cut wells in the field, the amount of wellbore liquid accumulation and the liquid discharge time are calculated based on step four, and the adjustment strategy of liquid lifting and injection reduction is determined and implemented. Through injection and production adjustment, 12 wells have seen obvious effect, and the liquid discharge and water control time is 1.5 months-4 months. The oil wells that have not seen effect are mainly affected by the fact that the well trajectory passes through the high permeability layer and the injection well point is concentrated, which requires longer liquid discharge time. The specific implementation effect is shown in Table 4.

[0100] Table 4 Water control effect of injection and production adjustment of high water cut wells (after four months of implementation)

[0101]

[0102]

[0103] As shown in the above table, after the injection-production adjustment is implemented for 4 months, for the high water cut wells after resumption of production, 3 of the 7 wells see obvious effects, and the water cut of the other 4 wells also decreases slightly. For the high water cut wells in the five-spot injection-production wells, 5 of the 7 wells see obvious effects, and 2 of the 7 wells do not see obvious effects. For the high water cut wells caused by the shutdown of surrounding oil wells, the water cut of 3 of the 4 wells decreases obviously after the implementation for half a month to three months, and the water cut of 1 of the 4 wells does not change obviously. The treatment of these wells is continuously tracked, and the effective period after treatment is up to 1 year and a half as of March 2023.

[0104] Based on the inventive concept of the present application, the present application further provides a heterogeneous reservoir water injection development method, comprising using the water control method for heterogeneous reservoir water injection development to control water in the process of heterogeneous reservoir water injection development.

[0105] Based on the inventive concept of the present application, the present application further provides a water control device for heterogeneous reservoir water injection development, the structure of the device is as shown in Figure 10

[0106] The water control object preliminary screening and classification module 101 is configured to screen water control objects from the horizontal oil wells in the reservoir according to the positional relationship between the well trajectory and the high permeability layer and the water cut and the recovery degree included in the single well dynamic development data, and perform classification and sorting.

[0107] The water flooded feature analysis module 102 is configured to obtain a preliminary identification result of the water flow channel direction and the remaining oil enrichment position based on the comparison with the resistivity curve of the through road well, and determine the water flooded degree and the water saturation before water injection of each water control object.

[0108] The water control object classification and sorting optimization module 103 is configured to update the understanding of the remaining oil enrichment position by fitting a dynamic numerical model based on the preliminary identification result and the monthly data of the oil and water wells, and adjust the classification and sorting of the water control objects in combination with the water flooded degree.

[0109] The liquid accumulation amount calculation module 104 is configured to determine the current liquid accumulation amount of the water control object based on the water saturation before water injection of the water control object and the injection and production data.

[0110] The water control measure formulation module 105 is configured to formulate the water control measure implementation sequence and the water control measure of each water control object based on the adjusted classification and sorting of the water control objects, determine the water production of the water control object after the water control measure is implemented, and determine the ratio of the liquid accumulation amount to the water production as the predicted liquid drainage time, and the water control measure is an adjustment of the work system.

[0111] In some embodiments, the water control object preliminary screening and classification module 101 screens water control objects from the horizontal oil wells in the reservoir according to the positional relationship between the well trajectory and the high permeability layer and the water cut and the recovery degree included in the single well dynamic development data, and performs classification and sorting, which is configured to:​

[0112] According to the single well dynamic development data including water cut and recovery degree, a single well water cut and recovery degree curve is drawn, the horizontal wells in the reservoir are classified according to the water cut rising type according to the curve characteristics, and the corresponding relationship between the water cut rising type and the influencing factors is determined; according to the position relationship between the well trajectory and the high permeability layer and the water cut, the control water object is selected from the horizontal wells in the reservoir on the basis of the classification result of the water cut rising type and the corresponding relationship between the water cut rising type and the influencing factors, and the classification and the difficulty degree of regulation and control are sorted.

[0113] In some embodiments, the control water object preliminary screening and classification module 101, which selects the control water object from the horizontal wells in the reservoir, classifies and sorts the difficulty degree of regulation and control, is used for:

[0114] The horizontal well with a water cut greater than 80% is selected as the control water object from the horizontal wells in the reservoir; the horizontal well with a water cut greater than 90%, a recovery degree of geological reserves less than 15% and a well trajectory obliquely passing through the high permeability layer is selected as a type 1 control water object; the horizontal well with a water cut not greater than 90%, a recovery degree of geological reserves less than 20% and a well trajectory obliquely passing through the high permeability layer is selected as a type 2 control water object; the horizontal well with a water cut not greater than 90%, a proportion of the well trajectory in the high permeability layer greater than a set proportion or a distance between the well trajectory and the high permeability layer less than a set distance is selected as a type 3 control water object; the horizontal well with a water cut not greater than 90% and a well trajectory above the high permeability layer is selected as a type 4 control water object; the above-mentioned four types of control water objects are from easy to difficult, and the remaining oil potential is from large to small.

[0115] In some embodiments, the water flooded feature analysis module 102, which is based on the preliminary identification result and the monthly data of the oil-water well, updates the understanding of the remaining oil rich part through the fitting of the dynamic numerical model, adjusts the classification and sorting of the control water object in combination with the water flooded degree, is used for:

[0116] The monthly data of the oil-water well in the reservoir is loaded into the dynamic numerical model, the fitting of the oil production, water cut and pressure of the whole area and the single well is carried out in combination with the preliminary identification result, the understanding of the remaining oil rich part is updated according to the fitting result; the intersection relationship between the horizontal section of the control water object and the high permeability layer and the remaining oil rich part is analyzed, and the classification and sorting of the control water object are adjusted in combination with the water flooded degree.

[0117] As to the apparatus in the above-mentioned embodiments, the specific way in which each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

[0118] Based on the inventive concept of the present application, the embodiment of the present application further provides a computer storage medium, wherein computer executable instructions are stored in the computer storage medium, and the computer executable instructions are executed by a processor to implement the water control method for heterogeneous reservoir water injection development.

[0119] Based on the inventive concept of the present application, the embodiment of the present application further provides a server, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the water control method for heterogeneous reservoir water injection development when executing the program.

[0120] Unless specifically stated otherwise, terms such as processing, computing, calculating, determining, displaying, and the like, can refer to an action or process of one or more processing or computing systems, or similar devices, that manipulate or transform data represented as physical (e.g., electronic) quantities within the systems' registers or memories into other data similarly represented as physical quantities within the systems' memories, registers or other such information storage, transmission or display devices. Information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0121] It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary implementations. Based upon design preferences, it should be understood that the specific order or hierarchy of steps in the processes can be re-arranged while remaining within the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and as such the order is merely an example and not intended to imply a requirement or particular order for the numerous steps. The methods can be performed in the order presented, in a different order than presented, or concurrently.

[0122] In the above detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This disclosed approach is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are explicitly recited in each claim. Rather, as the appended claims reflect, inventive subject matter can lie in fewer than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment.

[0123] Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

[0124] The steps of a method or algorithm described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium can be integral to the processor. The processor and the storage medium can reside in an ASIC. The ASIC can reside in a user terminal. In the alternative, the processor and the storage medium can reside as discrete components in a user terminal.

[0125] For a software implementation, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes can be stored in memory units and executed by processors. The memory unit can be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.

[0126] The above description includes one or more examples of the embodiments. Of course, not all possible combinations of components or method steps described above can be claimed as embodiments. One of ordinary skill in the art can recognize that modifications and variations of the embodiments described are also possible. It is therefore intended to cover in the appended claims all such further modifications and variations as fall within the true scope of the disclosure. Also, claims that include the language "consisting of" are intended to encompass the embodiments disclosed herein, as well as the equivalents thereof. Further, any of the terms "comprising", "including", "containing", "consisting of" and the like are to be read expansively and without limitation.

Claims

1. A water injection development water control method for a heterogeneous reservoir, characterized by, Comprise: Step S11, according to the water cut and recovery degree of single well dynamic development data, draw the single well water cut and recovery degree curve, according to the curve characteristics, the water cut of the reservoir horizontal well is classified, the corresponding relationship between the water cut and the influencing factors is clear; According to the position relationship between well trajectory and high permeability layer and water cut, on the basis of the classification result of water cut and the corresponding relationship between water cut and influencing factors, the water control object is selected from the reservoir horizontal well, the classification and the control difficulty degree sorting are carried out; Step S12, based on the comparison with the resistivity curve of the passing well, the preliminary identification result of the water flow channel direction and the remaining oil enrichment position is obtained, the water flooded degree and the water saturation before injection of each water control object are clear; Step S13, the monthly data of the oil and water well in the reservoir is loaded into the dynamic numerical model, the preliminary identification result is combined, the fitting of the oil production, water content and pressure of the whole area and single well is carried out, the understanding of the remaining oil enrichment position is updated according to the fitting result; The intersection relationship between the horizontal section of the water control object and the high permeability layer and the remaining oil enrichment position is analyzed, the classification and sorting of the water control object are adjusted combined with the water flooded degree; Step S14, based on the water saturation before injection of the water control object and the injection and production data, the current liquid accumulation amount is determined; Step S15, based on the classification and sorting of the adjusted water control object, the implementation sequence of the water control measure and the water control measure of each water control object are formulated, the water production of the water control object after the implementation of the water control measure is determined, the ratio of the liquid accumulation amount and the water production is determined as the predicted drainage time, and the water control measure is adjusting the working system.

2. The method of claim 1, wherein, Also include: For the water control object after the implementation of the water control measure, step S14 is repeatedly executed according to the week, the change of the liquid accumulation amount is determined, the change of the water cut is monitored, the predicted drainage time is updated, and the water control effect is evaluated; If the water control effect does not reach the set effect, the current water control measure is modified.

3. The method of claim 2, wherein, Also include: According to the monthly repetition of step S11 to step S15, the selected new water control object does not contain the horizontal well which has taken the water control measure.

4. The method of claim 1, wherein, The water cut rising type includes slow water cut rising type, rapid water flooded and high water cut slow rising type, rapid water flooded and water cut rapid rising type, sudden channeling water flooded and high water cut slow rising type and sudden water flooded and high water cut rapid rising type; The influencing factors include high permeability layer, fracture, high viscosity oil, bottom water and horizontal well trajectory.

5. The method of claim 1, wherein, The water control object is selected from the reservoir horizontal well, the classification and the control difficulty degree sorting are carried out, including: The horizontal well with water cut greater than 80% is selected as the water control object from the reservoir horizontal well; The horizontal well with water cut greater than 90%, geological reserve recovery degree less than 15% and well trajectory oblique through high permeability layer is taken as the first type of water control object; The horizontal well with water cut not greater than 90%, geological reserve recovery degree less than 20% and well trajectory oblique through high permeability layer is taken as the second type of water control object; The horizontal well with water cut not greater than 90%, the proportion of well trajectory in high permeability layer is greater than the set proportion or the distance between well trajectory and high permeability layer is less than the set distance is taken as the third type of water control object; The horizontal well with a water content of not more than 90% and a well trajectory above the high-permeability layer is taken as a water control object of category 4. The water control of the above-mentioned four categories of water control objects is from easy to difficult, and the remaining oil potential is from large to small.

6. The method of claim 1, wherein, The passing well is a well drilled to encounter the oil reservoir and has a later resistivity curve collection time than the corresponding water control object, and the passing well and the corresponding water control object are connected in the oil reservoir.

7. A method for waterflood development of a heterogeneous reservoir, characterized by, The method is used for water control in the process of water injection development of the heterogeneous oil reservoir.

8. A water injection development water control device for a heterogeneous reservoir, characterized by, The device comprises: The water control object preliminary screening and classification module is used for drawing a single-well water content and recovery degree curve according to the water content and recovery degree included in the single-well dynamic development data, classifying the oil reservoir horizontal well according to the curve characteristics, and determining the corresponding relationship between the water content rising type and the influencing factors; the water control object is screened from the oil reservoir horizontal well on the basis of the water content rising type classification result and the corresponding relationship between the water content rising type and the influencing factors according to the position relationship between the well trajectory and the high-permeability layer and the water content, and the classification and the difficulty degree sorting are performed; The water-out feature analysis module is used for obtaining a preliminary identification result of the water flow channel direction and the remaining oil enrichment position based on the resistivity curve comparison with the passing well, and determining the water-out degree and the water saturation before water injection of each water control object; The water control object classification and sorting optimization module is used for loading the monthly data of the oil and water wells in the oil reservoir into a dynamic numerical model, combining the preliminary identification result, performing the fitting of the oil production, water content and pressure of the whole region and the single well, updating the understanding of the remaining oil enrichment position according to the fitting result, analyzing the intersection relationship between the horizontal section of the water control object and the high-permeability layer and the remaining oil enrichment position, combining the water-out degree, and adjusting the classification and the sorting of the water control object; The liquid accumulation amount calculation module is used for determining the current liquid accumulation amount of the water control object based on the water saturation before water injection and the injection and production data of the water control object; The water control measure formulation module is used for formulating the water control measure implementation sequence and the water control measure of each water control object based on the adjusted classification and sorting of the water control object, determining the water production of the water control object after the water control measure is implemented, and determining the ratio of the liquid accumulation amount to the water production as the predicted liquid drainage time, and the water control measure is the adjustment of the work system.

9. A computer storage medium, characterized in that The computer storage medium stores computer executable instructions, and the computer executable instructions are executed by the processor to implement the water control method for water injection development of the heterogeneous oil reservoir according to any one of claims 1-7.

10. A server, characterized by The device comprises: The memory, the processor and the computer program stored on the memory and executable on the processor, and the processor implements the water control method for water injection development of the heterogeneous oil reservoir according to any one of claims 1-7 when executing the program.

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