CN110617042A - Layered water injection regulation and control method for high water-consumption zone development oil reservoir - Google Patents
Layered water injection regulation and control method for high water-consumption zone development oil reservoir Download PDFInfo
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Abstract
The invention relates to the field of oil and gas field development, in particular to a layered water injection regulation and control method for a high water-consumption zone development oil reservoir. The method comprises the following steps: step 1, collecting and sorting block geology and developing related data; step 2, obtaining a layered development index by applying a digital-analog simulation method; step 3, optimizing evaluation indexes of the water-consuming zone, and grading the high-water-consuming zone; step 4, screening a water injection regulation and control horizon according to the water consumption zone level by combining the development condition, and optimizing unit separate-layer water injection; and 5, finishing the optimization result, perfecting the layered water injection regulation and control scheme, and performing field implementation. The method distinguishes and divides water-consumption zone levels through high water-consumption zone classification coefficients, and combines a water-drive development index calculation method established by an oil reservoir engineering theory and an optimal segmentation theory aiming at different water-consumption zone levels, so that the water consumption is reduced, the economic life of an oil field is prolonged, and the aim of improving the oil reservoir recovery ratio is fulfilled finally.
Description
Technical Field
The invention relates to the field of oil and gas field development, in particular to a layered water injection regulation and control method for a high water-consumption zone development oil reservoir.
Background
The separated layer water injection is to combine small layers with similar reservoir physical property and development condition in one layer section by using a packer to inject water, thereby achieving the aims of reducing the interference between the layers and improving the utilization degree of the small layers with poor physical property. However, reasonable interval division is the basis of the zonal water injection and is also a main factor influencing the zonal water injection effect. At present, the most common method for dividing the interval of the stratified water injection layer is based on a layer system dividing method. However, there are significant differences in interval compartmentalization and layer compartmentalization of water injection wells: firstly, each layer in layer system division can be discontinuous, and the layer division in layered water injection requires that small layers of one layer are continuous; secondly, each layer system is required to be controlled to a certain recoverable reserve in the layer system division. Layer system subdivision water injection optimization is based on correct knowledge of reservoir properties. And for a multi-oil-layer complex reservoir in the later stage with ultrahigh water content, local mutation points appear, a high water-consumption zone develops, the overall water drive effect of the reservoir is influenced, and local residual oil is enriched. The parameters involved in developing an evaluation are complex, and none of the parameters alone can fully characterize the reservoir properties.
Sunzhubo et al propose a method for quantitatively representing displacement degree difference of each layer by adopting displacement flux, and comprehensively consider influences of factors such as reservoir thickness, porosity, water injection history and regulation and control period by taking balanced displacement as a target, thereby establishing a displacement flux equalization-based thinkingA method for determining the injection amount of each longitudinal layer of a desired water injection well. The adaptability of a thickness method, a formation coefficient method, a residual oil method and a displacement quantitative characterization-based equilibrium displacement method in different water-containing stages is analyzed by using a fine reservoir numerical simulation method. The numerical simulation result shows that when the water content is less than 50%, a thickness method is recommended; when the water content is 50-80%, a residual oil method is recommended; when the water content is 80-90%, a balanced displacement method is recommended. Adjusting the injection amount of the Bohai SZ oil field X1 well group by adopting an equilibrium method in a high water-cut period, reducing the average water content of the well group by 4% after adjustment, and increasing the oil by 117m day3The effect of precipitation and oil increase is obvious. Research results show that the method for determining the stratified injection allocation based on the displacement quantitative characterization can be used for guiding the adjustment of the injection allocation of each layer of a multi-layer commingled production reservoir water injection well in the high water cut stage (Sun Zhang, Liyunpeng, Jiaxiaofei, et al]Oil drilling technology, 2018, v.46; no.218(02) 91-95).
The channel division is carried out by the Zuizhi et al by taking the interlayer water absorption index difference as the water injection channel division index; according to the Buckley-Leverett non-piston type water flooding theory, aiming at realizing balanced displacement, a calculation method of the sectional injection allocation amount is established, a calculation program is compiled, and a numerical simulation model is used for verification. The calculation result shows that: the interlayer water absorption index grade difference is used as a water injection layer segmentation index, so that the method is scientific; the distribution of injection allocation quantity of each section is influenced by the physical property of a reservoir, the regulation and control time and the saturation of the residual oil; the longer the regulation and control time is, the smaller the difference of the unit thickness injection amount among the sections is, and the higher the water saturation is when the equilibrium is reached; the larger the average water saturation in the section is, the smaller the injection allocation amount per unit thickness is; the larger the interlayer water absorption index is, the smaller the injection allocation amount per unit thickness is (tremulative, liuliqin, graceful, et al. a segmented water injection interval division and reasonable injection allocation method based on balanced displacement [ J ] oil and gas geology and recovery ratio, 2017 (4)).
Aiming at the problems commonly existing in the high water-consumption zone of the whole-package sandstone oil reservoir in the later period of extremely high water content, the Liuqihong et al uses a numerical simulation method to obtain the ratio of the linear density of the small laminar flow to the linear density of the whole well in the later period of extremely high water content, the ratio of the oil change rate of the small layer to the economic oil change rate and the definition standards of evaluation indexes of the high water-consumption zone with 3 water saturation degrees in the small layer, and applies the research results to the whole-package sandstone oil reservoir in the Shengli oil field. The result shows that when the ratio of the streamline density of the small layer to the streamline density of the whole well is more than 2.5, the ratio of the oil change rate of the small layer to the economic oil change rate is less than 1.0, and the saturation of the water contained in the small layer is more than the average saturation of the water contained in the whole well, the oil deposit forms a high water-consumption zone. Research results have guiding significance for rapidly identifying high water-consumption zone of a victory oil field and taking effective regulation and control measures in time (Liu Shi hong, Zhuqi, Von hong thereof, et al. grading method of high water-consumption zone [ J ]. special oil and gas reservoir, 2018,25(06): 118-.
Disclosure of Invention
The invention aims to provide a design method for optimizing the development of an oil reservoir in a high-water-consumption zone at the later stage of ultra-high water content, selecting a plurality of parameter combinations for recombination and division and carrying out fine allocation on zonal injection according to a mathematical classification method-an optimal segmentation method on the basis of the grade identification of the high-water-consumption zone.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention mainly provides a layered water injection regulation and control method for a high water-consumption zone development oil reservoir, which comprises the following steps:
step 1, collecting and sorting block geology and developing related data;
step 2, obtaining a layered development index by applying a digital-analog simulation method;
step 3, optimizing evaluation indexes of the water-consuming zone, and grading the high-water-consuming zone;
step 4, screening a water injection regulation and control horizon according to the water consumption zone level by combining the development condition, and optimizing unit separate-layer water injection;
and 5, finishing the optimization result, perfecting the layered water injection regulation and control scheme, and performing field implementation.
According to the layered water injection regulation and control method for the oil reservoir with high water-consumption zone development, preferably, the collected data comprises static data and dynamic data; preferably, the static data comprises permeability distribution, porosity distribution, sand thickness and small layer reserves, and the dynamic data comprises saturation distribution, pressure distribution, oil-water density, oil-water viscosity, relative permeability curve, oil-water well history and oil-water production data.
According to the layered water injection regulation and control method for the oil reservoir with high water-consumption zone development, preferably, the digital-analog simulation method used in the step 2 mainly comprises the following steps: according to the geology and oil reservoir characteristics of the oil field, establishing an oil, water and gas three-phase or oil and water two-phase black oil model which accords with the actual characteristics of the oil field by using Eclipse software, wherein the oil, water and gas three-phase or oil and water two-phase black oil model comprises a fluid model, and preferably, the fluid model comprises original formation pressure, saturation pressure, volume coefficient, crude oil compression coefficient and oil-gas-water density; a rock or rock compression coefficient model, a phase permeability curve model and an oil-water well production dynamic model are divided into a simulation layer in a longitudinal direction, and an oil field development process is simulated by dividing a proper grid size; after the model is established, history fitting is carried out, and indexes of the whole oil field are fitted firstly, preferably, the indexes comprise pressure change, water content change and oil production; then fitting the single well indexes of the oil well and the water well, preferably, the indexes mainly comprise single well daily oil, daily fluid, water content and daily water injection amount; and after the index is fitted, ending the numerical simulation process.
According to the layered water injection regulation and control method for the oil reservoir with high water-consumption zone development, preferably, the layered development indexes obtained in the step 2 are as follows: daily water injection amount of the subareas, daily oil production amount of the subareas and water saturation of the subareas.
According to the layered water injection regulation and control method for the high water-consumption zone development oil reservoir, preferably, the step 3 of preferably evaluating indexes comprises the following steps: the ratio of the water consumption of the small layer to the economic water consumption, the ratio of the water absorption intensity of the small layer to the water absorption intensity of the whole well, and the ratio of the water saturation of the small layer to the average water saturation.
According to the layered water injection regulation and control method for the oil reservoir for high water-consumption zone development, preferably, the high water-consumption zone is graded by using a classification coefficient C of the high water-consumption zone, and the formula is as follows:
C＝ln(Re×Rd×Rs)
in the formula: c is a classification coefficient (dimensionless) of the high-water-consumption zone; rdThe small layer absorbs water stronglyThe ratio of the water absorption intensity of the whole well to the water absorption intensity of the whole well; rsThe ratio of the water saturation in the small layer to the average water saturation; reIs the ratio of the water consumption of the small layer to the economic water consumption.
According to the layered water injection regulation and control method for the high water-consumption zone development oil reservoir, preferably, the grading standards of the high water-consumption zones of the oil reservoirs with different rhythms are as follows:
classifying high water-consumption zone of positive rhythm oil reservoir:
common water-consuming layer belt: rd<2.5，Rs<1.0，Re<0.4，C≤0；
High water-consumption zone: r is more than or equal to 2.5d≤4.5，1.0≤Rs≤1.4，0.4≤Re≤1.0，0<C<1.8；
Extreme water-consuming layer belt: rd>4.5，Rs>1.4，Re>1，C≥1.8；
And (3) classifying the high water-consumption zone of the reverse rhythm oil reservoir:
common water-consuming layer belt: rd<2.5，Rs<1.0，Re<0.4，C≤0.2；
High water-consumption zone: r is more than or equal to 2.5d≤4.0，1.0≤Rs≤1.4，0.4≤Re≤1.0，0.2<C<1.7；
Extreme water-consuming layer belt: rd>4，Rs>1.4，Re>1，C≥1.7。
According to the layered water injection regulation and control method for the oil reservoir with high water-consumption zone development, preferably, the method for optimizing unit layered water injection comprises the following steps:
s1, determining a layer section division combined evaluation index set;
s2, adopting an optimal segmentation method to carry out layer section recombination and division;
and S3, splitting the high water consumption interval by adopting a method of combining water injection amount splitting and residual oil.
According to the layered water injection regulation and control method for the oil reservoir with high water-consumption zone development, preferably, the evaluation indexes comprise: permeability, viscosity, interlayer development condition, small layer thickness, formation pressure, production degree, residual recoverable reserve, water absorption strength and porosity.
According to the layered water injection regulation and control method for the oil reservoir with high water-consumption zone development, preferably, the combined evaluation index set for interval division can be the permeability, thickness, water absorption strength, extraction degree, residual recoverable reserve and porosity of the reservoir.
Compared with the prior art, the invention has the following beneficial effects:
the invention firstly divides different levels of the high water-consumption zone, and carries out targeted regulation and control on different water-consumption zone levels. The water consumption of the extreme water-consuming zone is increased rapidly, the development cost is increased continuously, the scientific development difficulty is increased, and the development benefit is further deteriorated at low oil price. The extreme water consumption zone causes low water injection efficiency and influences the whole water drive effect of the oil reservoir, and experiments show that the extreme water consumption zone is small (accounting for 12%) and has large water consumption (accounting for 87.8%). The invention aims at plugging the extreme water-consuming zone after grading the high water-consuming zone, and then regulating and controlling water injection according to different high water-consuming zones in a grading way, thereby having more advantages in economy.
The method of the invention has the advantages of more reasonable division of the high-water-consumption zone and more convenient operation. The invention adopts the ratio R of the small-layer water absorption intensity to the whole-well water absorption intensitydThe characteristic of high water consumption layer water consumption can be reflected, and the great influence caused by manual operation division is avoided; meanwhile, the classification system of the high-water-consumption zone is provided, the comprehensive influence of a plurality of factors is considered, and the characteristics of high water consumption and high water absorption strength of the high-water-consumption zone are comprehensively embodied; the classification of the high water consumption zone is more accurate and the actual operation is easier.
Drawings
FIG. 1 is a schematic flow chart of a layered water injection control method for a high water-consumption zone development oil reservoir of the invention;
FIG. 2 is a schematic flow chart of an optimized combination method for subdividing water injection intervals;
FIG. 3 is a schematic diagram of a calculation flow of an optimized combination scheme for a subdivided water injection interval;
FIG. 4 is a histogram of the basic parameters of the layers;
FIG. 5 is a bar graph of the regulation effect of a general water consumption zone;
FIG. 6 is a bar graph of the regulation effect of the high water-consumption zone.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
The layered water injection regulation and control method for the oil reservoir with high water-consumption zone development comprises the following steps: step 1, collecting and sorting block geology and developing related data; step 2, obtaining a layered development index by applying a digital-analog simulation method; step 3, optimizing evaluation indexes of the water-consuming zone, and grading the high-water-consuming zone; step 4, screening a water injection regulation and control horizon according to the water consumption zone level by combining the development condition, and optimizing unit separate-layer water injection; and 5, finishing the optimization result, perfecting the layered water injection regulation and control scheme, and performing field implementation.
The object of the invention can also be achieved by the following technical measures:
in step 1, the collected data includes: static data: permeability distribution, porosity distribution, sand thickness, small bed reserves; dynamic data: saturation distribution, pressure distribution, oil-water density, oil-water viscosity, relative permeability curve, oil-water well history, and oil-water production data.
In step 2, obtaining development hierarchical development indexes includes: and setting digital-analog partition data, simulating the flow condition of reservoir formation fluid by digital-analog software, and deriving three identification indexes of a high-water-consumption zone in a numerical simulation result, namely daily water injection amount (RWIR) of a certain partition, daily oil production amount (ROPR) of a certain partition and water saturation amount (RWSAT) of a certain partition.
In step 3, the water-consumption zone evaluation index is optimized, and the grading of the high-water-consumption zone mainly comprises the following steps: selecting defined indexes of the high-water-consumption zone: high water-consuming zones should first be economically unproductive compared to other zones; the macroscopic expression of the high water consumption layer belt is as follows: the water consumption is high, and the water absorption strength is high; compared with other areas, the water saturation of the high water consumption zone is high, and the water phase seepage capability is strong. Three evaluation indexes are determined according to the static and dynamic performance characteristics of a high water consumption zone, (1) the ratio of the water consumption of a small layer to the economic water consumption: ensuring a high water consumption zone is economically not cost-effective (economic water consumption is defined as the maximum amount of water injected per unit of oil production consumed under the current economic and technical conditions, so this index is a certain value given the price of oil); (2) ratio of water absorption intensity of small layer to water absorption intensity of whole well: ensuring that the water passing through the high water consumption layer belt is large; (3) ratio of water saturation of the small layer to the average water saturation: ensure that the water phase seepage capacity in the high water consumption zone is larger than that in other zones.
Ratio R of water consumption of small layer to economic water consumptioneRWIR/ROPR/economic water consumption. The larger the value, the higher the water-consuming zone grade. Ratio R of water absorption intensity of small layer to water absorption intensity of whole welld(RWIR/small layer effective thickness)/(FWPR/full well effective thickness). The larger the value, the higher the water-consuming zone grade. Ratio R of water saturation of small layer to average water saturationsRWSAT/FWSAT. The larger the value, the higher the water-consuming zone grade. (RWIR, ROPR, RWSAT, FWPR, FWSAT represent target aquifer daily injection, aquifer daily oil production, aquifer saturation, whole well water production, whole well water saturation, respectively.) economic water consumption: under the existing economic and technical conditions, the maximum water injection amount allowed to be consumed by producing one ton of oil is guaranteed without loss of cost. Density of oil: 860kg/m31 bucket 158.98L3$ 50, exchange rate of dollars: 6.7, calculating to obtain the economic water consumption of 105m3。
The method for optimally designing the layered water injection regulation and control method of the high water-consumption zone development oil reservoir further comprises the step of carrying out level division on the high water-consumption zone after determining three evaluation indexes of the high water-consumption zone in the step 2. In order to comprehensively reflect the classification standard of the high water consumption zone, the classification coefficient of the high water consumption zone is provided on the basis of evaluating a single index. The formula is as follows:
C＝ln(Re×Rd×Rs)
in the formula: c is a classification coefficient (dimensionless) of the high-water-consumption zone; rdThe ratio of the water absorption intensity of the small layer to the water absorption intensity of the whole well; rsThe ratio of the water saturation in the small layer to the average water saturation; reIs the ratio of the water consumption of the small layer to the economic water consumption. The accuracy of the multi-parameter comprehensive evaluation methods such as fuzzy theory, cluster analysis and the like mainly depends on the weight, and the final result may be greatly different from the actual result of a mine field. The classification coefficient of the high water-consumption zone can not only reflect the classification standard of the high water-consumption zone of the reservoir, but also overcome the influence of artificial factors (weight) in the conventional method and reduce errors. Through mathematical statistical analysis, the classification standards of the high water-consumption zone of the oil reservoirs with different rhythms are obtained (tables 1-2).
TABLE 1 Positive rhythm reservoir high water consumption zone classification parameter table
TABLE 2 high water consumption zone classification parameter table of reverse rhythm oil reservoir
In step 4, different water consumption layer belt grades are obtained according to the classification coefficient of the high water consumption layer belt in the step 3, and after the extreme water consumption layer belt is plugged, optimized separate injection amount allocation is carried out on the high water consumption layer belt and the common water consumption layer belt.
The allocation of the zonal injection is based on the correct knowledge of the reservoir properties. For a multi-reservoir complex reservoir in the later period of high-water-content development, the related parameters are complex, and a single parameter cannot fully characterize the properties of the reservoir. Therefore, according to the mathematical classification method, the optimal segmentation method, a plurality of parameter combinations are selected for recombination and division.
Firstly, determining the number of the segments of the preferable layered water injection through external circulation according to different segmentation number dividing schemes and combining the current process and economic constraint conditions. Then, the inner loop is executed, and the segment position is preferably selected based on the determined number of segments. And optimizing the segmentation position, wherein the main steps are to apply an optimal segmentation method, evaluate the attribute difference of each segment under the current segment division scheme according to an index evaluation method, and finally determine the optimal scheme of the segmentation position under the optimal segmentation method through circular comparison.
(1) Optimal segmentation method
The optimal segmentation method is a clustering method of ordered stratums, and small layers with similar physical properties are combined together without changing the sequence of the stratums. For the optimal segmentation method, the static and dynamic factors of the oil reservoir which have influence on the interval division of the separated layer water injection must be determined, then all schemes of the interval combination are determined, the total diameter value of the interval combination schemes is calculated, and finally the optimal interval division combination is determined.
(2) Determination of interval division combined evaluation index set
Determining reservoir static factors and development dynamic factors which have great influence on the effect of the zonal injection, specifically as follows: permeability: the larger the difference of the permeability of different small layers is, the stronger the heterogeneous layer section is, and the more easily the injected water enters along the high-permeability layer section; viscosity: the larger the viscosity difference of different small layers is, the larger the difference of the flow capacity is, the more serious the interlayer interference is, and the worse the separate injection effect is; interlayer development condition: the more stable the interlayer development is, the less obvious the interlayer channeling is, and the better the layered water injection effect is; thickness of the small layer: the larger the thickness of the main force layer is, the stronger the water absorption capacity is, and the stronger the action of gravity on injected water in the layer is, the easier the water can enter along the bottom of the small layer; formation pressure: the larger the difference of the stratum pressure is, the larger the difference of the water absorption of each small layer is, and the worse the layered water injection effect is; the extraction degree is as follows: the mining degree reflects the difference of the development effect of the small layer, the larger the mining degree difference is, the more serious the interlayer interference of water injection in one layer section is combined, and the worse the layered water injection effect is; the remaining recoverable reserve: the small layers have different residual recoverable reserves, different development potentials and different required injection allocation amounts.
The optimal segmentation method defines evaluation indexes to be considered in the interval division of the layered water injection layer as an attribute set as follows
In the formula, xjlAnd (l ═ 1,2, …, p) represents permeability, production level, thickness, barrier distribution and other properties of the jth formation.
(3) Layer interval division combination scheme
For a reservoir with n small zones, interval division may be performedAnd (3) seed layer interval division and combination schemes, wherein all the schemes are defined as a strategy set: b ═ B1,b2,b3,…,bm). Wherein b isiAnd (i is 1,2, …, m) is a mode of combining intervals according to different permeability grade differences, the number of oil layers, the degree of flooding, the development condition of the interlayer and the like, and can be a two-section or multi-section combination, which is determined according to the well bore layering process and the economic benefit.
(4) Calculating the diameter of the divided layer segment
The method comprises the steps of considering the difference of reservoir conditions and development effects of each layer and the difference of emphasis points of a combination scheme of each layer, introducing a concept of the diameter of each layer, fully considering the influence of geological factors and development factors (such as indexes of permeability grade difference, water absorption strength grade difference, residual geological reserve, thickness of each layer, number of the layers and the like) of each layer on layered water injection, calculating the diameter of each layer, and evaluating the advantages and disadvantages of the combination scheme of the layers according to the diameter of each layer.
Suppose that n reservoirs need to be divided into k intervals during zonal injection, each interval has nkAnd (4) an oil layer. By { xp,l,xp+1,l,…,xq,lDenotes the interval of water injection from the p small layer to the q small layer, wherein p is more than or equal to 1 and less than or equal to q and less than or equal to n, the diameter of the interval is:
wherein
In the formula: dl(p, q) represents the layer segment { xp,l,xp+1,l,…,xq,lD, the layer section diameter of each small layer reflects the difference condition of l attributes of each small layerlThe smaller (p, q) is, the smaller the difference in l-property between small layers within a segment is represented.
And calculating the diameter of each attribute interval, and equally considering the influence of each factor on the zonal injection, namely the influence degree of each factor on the diameter of each interval is the same. And calculating the sum of the diameters of the intervals of all the attributes in the scheme to finally obtain the total diameter value of the interval combination scheme. The method comprises the following specific steps:
in the formula (d)klThe interval diameter representing the ith property of the kth segment.
Since the purpose of interval division of the stratified injection water is to combine intervals with similar physical properties, it is desirable that the smaller the diameter of the interval is, the better the interval is. Therefore, the interval with the smallest interval diameter is divided into the combination scheme which is the best scheme.
In step 4, the injection allocation method of the water injection layer section needs to be optimized, and the injection allocation method mainly comprises 2 methods:
(1) thickness method
Wherein H is the reservoir thickness, m; qwWater injection rate m for a well of an oil reservoir3/d；qiThe amount of split water in a layer of the water well. The thickness method is used for splitting the water injection amount according to the geological reserve and is suitable for early stage zonal injectionAnd (6) dispensing.
(2) Residual oil process
In the formula, QwWater injection rate m for a well of an oil reservoir3/d；RiThe crude oil extraction degree of the ith layer of the oil reservoir,%; n is a radical ofiThe original geological reserves of the ith layer of the oil reservoir. The residual oil method is based on the quantitative description of residual oil, and splits the water injection amount according to the residual recoverable reserve. Because the integral oil reservoir of the oil field is in the later stage of ultrahigh water content and the water content reaches over 95 percent, the residual oil method is preferably used for distributing and injecting the water injection interval.
And 5, on the basis of the level identification and division of the high-water-consumption zone, finishing, subdividing and optimizing the water injection result, putting the water injection result into a mine field for implementation, and ending the process.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
In order to make the above contents of the present invention more obvious and understandable, the following takes a typical 1-3 unit well group of the sugpo oil field sugpo zone sandi as an example, and uses a layered water injection regulation and control optimization design method of a high water-consumption zone development reservoir, which is described in detail as follows:
1. collecting and sorting geological and development related data of the block:
the data source can be in various forms, can be digital data derived from an existing geological model or a numerical model, and can also be obtained by carrying out digital processing according to a related geological development drawing.
The data collected included:
(1) static data: permeability distribution, porosity distribution, sand thickness, small bed reserves;
(2) dynamic data: saturation distribution, pressure distribution, oil-water density, oil-water viscosity, relative permeability curve, oil-water well history, oil-water well production data and the like.
The basic parameters of each layer of a typical well group of 1-3 units of the sand in the Sheng Tuo oil field Sheng I area are shown in the table below.
TABLE 3 layers of basic Attribute parameter values
In order to more intuitively represent the geological condition and development condition of the typical well group with 1-3 units of the sand in the victory first region, a bar graph of parameters of each small layer of the typical well group is drawn (figure 4).
2. Developing digital-analog research to obtain layered development index and grading judgment of water consumption zone
And calculating three defined index values and comprehensive classification coefficients of the simulated well zone based on the high water-consumption zone identification and development rule research content. And (4) summarizing the development level of the high water-consumption zone of the test well according to the high water-consumption zone definition standard and the classification coefficient table. As in table 4.
TABLE 4 determination of the development grade of the water-consuming zone in the test area
In order to accurately describe the layered water injection effect of the oil reservoir, the water storage rate of a typical block is improved, and the economic limit life of the target oil reservoir is prolonged. And aiming at the identified extreme water-consuming zone, a regulating and controlling strategy of direct plugging is adopted. And taking a layered water injection measure aiming at the identified high water consumption zone and the common water consumption area.
3. Subdivision water injection segmentation optimization
And (3) comprehensively considering the influence degree of each factor on the water injection effect, and selecting six main control factors of reservoir permeability, reservoir thickness, water absorption strength, extraction degree, residual recoverable reserve and porosity as an attribute set of the optimal segmentation method.
For reservoirs which have plugged extreme water-consuming zones, the water-consuming intervals [1,2,4,5,6,7,8,10,11,13,14,15,16,17,18] are interval-divided by optimization calculation. The results of the division are shown in Table 5.
TABLE 5 high water consumption interval division combination scheme
Based on quantitative description of residual oil of an oil reservoir, splitting the typical block by adopting a method of combining water injection splitting and residual oil on the basis of interval division of the high water-consumption zone of the typical block. The final water injection split results are shown in tables 3-6.
Table 6 split water-dispensing meter for high water-consumption layer section
And (3) simulating the change condition of the regulation and control effect evaluation index of the common water consumption area 15 years after the oil reservoir is simulated by using the Eclipse software. Including extending the percentage of economic life, reducing the percentage of water consumption and increasing the percentage of cumulative oil production. Numerical simulation results show that the economic life of the oil reservoir is prolonged from 13.1 years to 19.8 years, and is prolonged by 51.14%; the water consumption of the oil reservoir is from 8.62m3Reduced to 5.05m3The reduction is 41.41%; the accumulated oil yield is increased from 5.89 ten thousand tons to 7.55 ten thousand tons, and is increased by 28.18 percent. The results are shown in FIG. 5.
And the change condition of the regulation and control effect evaluation index in the high water consumption area can be obtained in the same way. Numerical simulation results show that the economic life of the oil reservoir is prolonged from 8.6 years to 12.4 years, which is 44.18% longer; the water consumption of the oil reservoir is from 71.42m3Reduced to 30.30m3The reduction is 57.57%; the accumulated oil yield is increased from 21.5 ten thousand tons to 25.6 ten thousand tons, and is increased by 19.07 percent. The results are shown in FIG. 6.
The water injection effect of the high and low permeability reservoir is effectively changed by the layered water injection, so that the water injection of the medium and low permeability reservoir is enhanced, the water injection amount of the high permeability reservoir is controlled, and the aim of balanced water drive is finally achieved. 3-5 and 3-6 show that the economic life can be prolonged, the water consumption can be reduced, the water storage rate of the oil reservoir can be improved and the final purposes of increasing oil and reducing water in the oil reservoir can be achieved by adopting a stratified water injection measure at the later stage of the ultrahigh water content. At the present stage, the victory oil field is in a high water-cut stage, some oil reservoir blocks reach the later stage of extra high water cut, and corresponding regulation and control measures are urgently needed to improve the oil reservoir recovery ratio. After the high water-consumption zone is identified, the requirements of oil field development can be reasonably met by implementing a layered water injection regulation and control measure aiming at different water-consumption zones, the period of oil field exploitation is effectively prolonged, and the oil field exploitation cost at the present stage is reduced.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A layered water injection regulation and control method for a high water-consumption zone development oil reservoir is characterized by comprising the following steps:
step 1, collecting and sorting block geology and developing related data;
step 2, obtaining a layered development index by applying a digital-analog simulation method;
step 3, optimizing evaluation indexes of the water-consuming zone, and grading the high-water-consuming zone;
step 4, screening a water injection regulation and control horizon according to the water consumption zone level by combining the development condition, and optimizing unit separate-layer water injection;
and 5, finishing the optimization result, perfecting the layered water injection regulation and control scheme, and performing field implementation.
2. The zonal water injection control method for the oil reservoir with high water consumption zone development according to claim 1, wherein the collected data comprises static data and dynamic data; preferably, the static data comprises permeability distribution, porosity distribution, sand thickness and small layer reserves, and the dynamic data comprises saturation distribution, pressure distribution, oil-water density, oil-water viscosity, relative permeability curve, oil-water well history and oil-water production data.
3. The zonal water injection regulation and control method for the oil reservoir with high water-consumption zone development according to claim 1, wherein the digital-analog simulation method used in the step 2 mainly comprises the following steps: according to the geology and oil reservoir characteristics of the oil field, an Eclipse software is utilized to establish an oil, water and gas three-phase or oil and water two-phase black oil model which accords with the actual characteristics of the oil field, wherein the oil, water and gas three-phase or oil and water two-phase black oil model comprises a fluid model, a rock model, a phase permeation curve model and an oil-water well production dynamic model, then a simulation layer is longitudinally subdivided, a proper grid size is divided, and the development process of the oil field is simulated; after the model is established, history fitting is carried out, firstly, indexes of the whole oil field are fitted, then, single well indexes of the oil well and the water well are fitted, and after the indexes are fitted, the numerical simulation process is finished.
4. The layered water injection regulation and control method for the oil reservoir with high water consumption zone development according to claim 1, characterized in that the layered development indexes obtained in the step 2 are as follows: daily water injection amount of the subareas, daily oil production amount of the subareas and water saturation of the subareas.
5. The zonal water injection regulation and control method for the high water-consumption zonal development oil reservoir according to claim 1, wherein the step 3 of preferably evaluating indexes comprises the following steps: the ratio of the water consumption of the small layer to the economic water consumption, the ratio of the water absorption intensity of the small layer to the water absorption intensity of the whole well, and the ratio of the water saturation of the small layer to the average water saturation.
6. The zonal water injection control method for the high water-consumption zonal development oil reservoir according to claim 1, characterized in that the high water-consumption zonal classification coefficient C is used for grading the high water-consumption zonal, and the formula is as follows:
C＝ln(Re×Rd×Rs)
in the formula: c is a classification coefficient (dimensionless) of the high-water-consumption zone; rdThe ratio of the water absorption intensity of the small layer to the water absorption intensity of the whole well; rsThe ratio of the water saturation in the small layer to the average water saturation; reIs the ratio of the water consumption of the small layer to the economic water consumption.
7. The zonal water injection regulation and control method for the high-water-consumption zonal development oil reservoir according to claim 6, wherein the grading standards of the high-water-consumption zonal of the oil reservoir with different rhythms are as follows:
classifying high water-consumption zone of positive rhythm oil reservoir:
common water-consuming layer belt: rd<2.5，Rs<1.0，Re<0.4，C≤0；
High water-consumption zone: r is more than or equal to 2.5d≤4.5，1.0≤Rs≤1.4，0.4≤Re≤1.0，0<C<1.8；
Extreme water-consuming layer belt: rd>4.5，Rs>1.4，Re>1，C≥1.8；
And (3) classifying the high water-consumption zone of the reverse rhythm oil reservoir:
common water-consuming layer belt: rd<2.5，Rs<1.0，Re<0.4，C≤0.2；
High water-consumption zone: r is more than or equal to 2.5d≤4.0，1.0≤Rs≤1.4，0.4≤Re≤1.0，0.2<C<1.7；
Extreme water-consuming layer belt: rd>4，Rs>1.4，Re>1，C≥1.7。
8. The zonal water injection regulation and control method for the high-water-consumption zonal development oil reservoir according to claim 1, wherein the method for optimizing unit zonal water injection comprises the following steps:
s1, determining a layer section division combined evaluation index set;
s2, adopting an optimal segmentation method to carry out layer section recombination and division;
and S3, splitting the high water consumption interval by adopting a method of combining water injection amount splitting and residual oil.
9. The zonal water injection regulation and control method for the high water-consumption zonal development oil reservoir according to claim 8, wherein evaluation indexes comprise: permeability, viscosity, interlayer development condition, small layer thickness, formation pressure, production degree, residual recoverable reserve, water absorption strength and porosity.
10. The zonal water injection regulation and control method for the oil reservoir with the high water-consumption zone development of claim 9, wherein the combined evaluation index set for interval division can be the permeability, the thickness, the water absorption strength, the production degree, the residual recoverable reserve and the porosity of the oil reservoir.
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