CN113971528A - Method for identifying dominant seepage channel - Google Patents
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Abstract
The invention relates to a method for identifying a dominant seepage channel, and belongs to the technical field of oilfield development. The method comprises the steps of firstly, describing basic geological features of a reservoir according to geological elements influencing a dominant seepage channel; determining an injection-production well pattern according to historical well pattern adjustment data, and combining different well group injection-production effective direction parameter values obtained under the historical production condition; then determining the water passing times and the permeability in the injection-production effective direction according to an oil reservoir engineering method; comprehensive production dynamic monitoring data further analyze water passing multiples in different injection and production directions, and determine lower limit values of physical properties and water passing multiples in different levels of advantageous seepage channels; and finally, defining the dominant seepage channels of different levels to realize the identification of the dominant seepage channels. The invention integrates dynamic and static data, overcomes the defect that the traditional method mainly identifies the dominant channel by taking dynamic monitoring data as a main part, and improves the precision between predictions of the dominant seepage channel.
Description
Technical Field
The invention relates to a method for identifying a dominant seepage channel, and belongs to the technical field of oilfield development.
Background
The water injection development mode is an important method for improving the recovery efficiency, is widely applied to various oil fields, and in the long-term water injection development process, the water injection soaking and scouring effect generates transformation with different degrees on a reservoir stratum, and the microcosmic property of the water injection soaking and scouring effect generates physical and chemical effects, so that the parameters of the reservoir stratum are changed. The driving force of injected water and the scouring force generate erosion and denudation effects on rock mineral particles and inter-granular cement of a reservoir stratum, so that the pore throat becomes smooth or the throat space is enlarged, the coordination number of the pore throat is increased, a larger high-permeability reservoir stratum area is added in the throat to form a 'dominant seepage channel', further development of an oil field is influenced, and the direction of the dominant seepage channel is determined to be imperative. The conventional oil reservoir dominant seepage channel identification method mainly takes dynamic monitoring data and dynamic analysis of a single well point as a basis, has multiple subjective factors, high cost and few well points, has certain difficulty in comprehensive popularization, and restricts the adjustment of an injection-production structure to improve the development effect.
Disclosure of Invention
The invention aims to provide a method for identifying a dominant seepage channel, which aims to solve the problem of low identification precision caused by adopting dynamic analysis to identify the dominant seepage channel in the development process of a water-injection oil reservoir at present.
The invention provides a method for identifying an advantageous seepage channel to solve the technical problem, which comprises the following steps:
1) acquiring geological elements influencing the dominant seepage channel of the area to be identified;
2) determining an injection-production well pattern according to the historical well pattern adjustment data, and determining the water yield of an oil well in the injection-production well pattern;
3) determining the water passing times and the average permeability between oil wells and water wells in the injection-production affected direction;
4) performing interactive analysis on the obtained water passing multiple and average permeability to determine the dominant channel division standard;
5) and performing semi-quantitative identification on the dominant seepage channel of the target area by using the obtained dominant channel division standard.
Determining an injection-production well pattern by combining the dynamic and static data of the production well, and then obtaining parameter values in different injection-production corresponding directions of different well groups by combining the historical production conditions; the water passing multiple and the permeability in the injection and production receiving direction are determined through an oil reservoir engineering method, meanwhile, the water injection receiving conditions in different injection and production directions are further analyzed through comprehensive production dynamic monitoring data, the lower limit values of reservoir physical properties and the water passing multiple in the injection and production receiving relationship are determined through a statistical method, finally, dominant seepage channels are identified on the plane, distribution areas of different types of dominant channels are defined, and the foundation is provided for comprehensive adjustment of a water drive oil reservoir well pattern and liquid flow steering. The invention brings the identification of the dominant seepage channel into the dynamic monitoring constraint for fine depiction, overcomes the defect that the dominant channel is mainly identified by dynamic monitoring data in the prior art, and improves the prediction precision of the dominant seepage channel.
Further, in order to accurately determine the water yield of the oil well in the injection and production well network, the implementation process of the step 2) is as follows:
a. counting the water injection well and the oil production well to determine an injection and production well pattern;
b. determining that the oil production well in the historical injection and production well network is a unidirectional corresponding well number or a multidirectional corresponding well number;
c. determining the yield splitting coefficient in the injection-production corresponding direction by using the permeability of the oil well, the permeability of the water well and the well spacing of the oil well and the water well;
d. and determining the water yield of the oil well in the injection and production well network according to the yield splitting coefficient.
Further, the calculation formula of the yield splitting coefficient γ is as follows:
γ＝(K1+K2)/2L2
wherein K1For the permeability of the oil well in the injection-production well network, K2Is the permeability of the well, L1The well spacing of the oil-water well is adopted.
Further, in order to accurately determine the water passing multiple, the determination process of the water passing multiple in the step 3) is as follows:
A. counting the perforation thickness of an oil-water well in an injection-production well network, and determining the average thickness in different injection-production directions;
B. calculating the recovery ratio and the single storage coefficient of the area to be identified, and determining the swept area in different injection and production directions according to the obtained average thickness and the parameters obtained in the step 2);
C. and determining the water passing times in different injection and production directions according to the swept areas.
Further, the medium wave and the area S in the step B1The calculation formula of (2) is as follows:
wherein ERFor recovery, beta is the single storage coefficient, Q1In order to inject and extract the water yield of the oil well in the well network,
the average thickness in different injection and production directions.
Further, the geological elements include reservoir formation, sedimentary microfacies, porosity, permeability, heterogeneity, and oil bearing area.
Drawings
FIG. 1 is a flow chart of a method of identifying a dominant seepage pathway of the present invention;
FIG. 2 is a graph of permeability of a fault block A versus scatter plot of tracer concentration in an example of the present invention;
FIG. 3 is a statistical chart of the physical properties of the A broken blocks and the scattering points of the water passing times in the embodiment of the present invention;
FIG. 4 is a block A dominant channel plane distribution diagram in an embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The advantage seepage channel is a low-resistance seepage channel locally formed in a reservoir layer due to geological and development factors, and injected water forms obvious advantage flow along the channel at the later stage of water injection development to generate a large amount of ineffective circulation of the injected water. The formation of the dominant seepage channels in the reservoir plays an important role in the distribution and migration of fluids, and influences the formation and distribution of the remaining oil. In the water injection development process, the injected water mainly moves along the dominant seepage channel, and the injected water spread degree is high; the non-dominant seepage channels such as the side edge of the riverway and the like with small relative thickness, low permeability, low pressure conduction speed and the like have low water wave filling degree, and the saturation degree of the residual oil is higher.
The invention provides a method for identifying the dominant seepage channel, which comprises the steps of describing the basic geological characteristics of a reservoir according to geological elements influencing the dominant seepage channel; determining an injection-production well pattern according to historical well pattern adjustment data, and combining different well group injection-production effective direction parameter values obtained under the historical production condition; then determining the water passing times and the permeability in the injection-production effective direction according to an oil reservoir engineering method; comprehensive production dynamic monitoring data further analyze water passing multiples in different injection and production directions, and determine lower limit values of physical properties and water passing multiples in different levels of advantageous seepage channels; and finally, defining the dominant seepage channels of different levels to realize the identification of the dominant seepage channels. The implementation flow of the method is shown in fig. 1, and the specific implementation process of the present invention is described in detail below by taking a broken block a as an example.
1. Geological features of the area to be identified are determined.
The invention describes the basic geological features of the reservoir one by one according to geological elements influencing the dominant seepage channel, wherein the geological elements of the reservoir comprise structure, perforation thickness, porosity, permeability and oil-containing area, and provide basic data for later-stage yield splitting.
In the step, the structure and the oil-containing area determine the range of the research work area according to the basis of drawing a small layer plan.
β＝φ*So*γ/Bo
Where phi is the oil layer porosity, SoIs the original oil saturation of the oil layer, gamma is the density of the crude oil, BoIs a volume factor.
2. And determining injection and production well patterns according to the historical well pattern adjustment data, and determining parameters in corresponding directions on different injection and production well patterns.
The parameters of the injection and production well network corresponding to the direction determined in the step refer to water yield, and are obtained through historical production conditions, and the specific implementation process is as follows:
a) counting the water injection well and the oil production well to determine a historical injection and production well pattern;
b) determining that the oil production well in the historical injection and production well network corresponds to a single-direction corresponding well number or a multi-direction corresponding well number;
c) statistics of oil well permeability K in injection and production well network1Water well permeability K2And well spacing L of oil-water well1Determining the yield splitting coefficient gamma in the corresponding injection-production direction, if the oil-water well is in one-way correspondence, the splitting number gamma is 1;
γ＝(K1+K2)/2L2
d) determining oil well water yield in historical injection and production well networkQ1；
Q1＝Q*γ
3. And determining the water passing times and the average permeability between the oil and water wells in the injection and production affected direction.
Determining the water passing times and the average permeability between oil wells in the injection and production receiving directions according to an oil reservoir engineering method, and further analyzing the water injection receiving conditions in different injection and production directions by comprehensive production dynamic monitoring data:
a) counting the perforation thickness H of the oil-water well in the injection-production well network, and determining the average thickness in different injection-production directions
b) Recovery of the target zone ERCalculating the single storage coefficient beta, neglecting the influence of formation water, namely the water yield of the oil well is the injection amount of the water injection well in the injection and production direction, and determining the swept area S in different injection and production directions1；
c) Determining water passing times lambda in different injection and production directions;
d) the dynamic monitoring data mainly comprises the steps of analyzing the concentration of the polymer, further determining the influence of the concentration of the tracer on the dominant channel by utilizing a cross plot of the concentration of the tracer and the permeability, and determining three regions of the permeability on the concentration of the tracer according to the cross plot so as to provide basis for the recognition standard of the dominant channel in the later period.
The permeability of the A-fraction obtained by the above process and the statistics of the tracer concentration scatter point are shown in FIG. 2.
4. And performing interactive analysis (ignoring the influence of other geological factors) on the obtained water passing times and the average permeability between the oil and the water, and determining the dominant channel division standard.
And (3) according to the water passing multiple and the average permeability between the oil wells and the water wells obtained in the step (3), performing interactive analysis on physical properties (permeability) and the water passing multiple by using a probability statistics mode, drawing a junction graph, and determining the permeability of the dominant seepage passage and the lower limit of the water passing multiple according to the junction graph.
For the embodiment, the water passing multiple and the permeability of the segment a obtained in step 3 are interactively analyzed, the obtained intersection graph is shown in fig. 3, and the dominant channel division standard and the classification evaluation table of the segment a determined based on the intersection graph are shown in table 1.
TABLE 1
5. And performing semi-quantitative identification on the dominant seepage channel of the target area by using the obtained dominant channel division standard.
For the present embodiment, dominant channel division is performed on the a segment block by using the division standard in table 1, and the plane distribution of the dominant channel of the a segment block is shown in fig. 4. The invention is applied to the recognition of the dominant channel of the A broken block, the established dominant channel recognition standard is utilized, the direction and the region of the dominant channel of the water drive oil reservoir are recognized on a plane, various division indexes are integrated on the plane, and the types of the dominant channel are divided, so that different development strategies are provided for different dominant seepage channels, and the aim of improving the oil reservoir development effect is fulfilled.
The recognition and evaluation results of the preferential seepage passage in the area show that the A broken blocks IV 1, 2 and 9 are considered to have large oil-containing areas, large effective thickness and large reserve capacity scale and have the potential of further improving the recovery efficiency, the well network comprehensive adjustment and tertiary oil recovery technology is adopted to predict the movable geological reserve capacity 169.35 multiplied by 104t, the initial capacity of a single well is about 3 to 4t, and according to the oil price 60$/bbl, the drilling, fracturing, ground investment and operation cost, sales tax, the rate of commodity of crude oil, the loan rate and the like are considered, the cumulative oil increase of 13.1 multiplied by 104t can be predicted at the end of fifteen years, the recovery efficiency is improved by 3.22 percentage points, and the economic benefit is increased by 3.5 yuan.
In 2016 + 2019, the oil is increased by 2000t at 6 ports of the A broken block production well position in a stage, and the average single well yield in the initial stage reaches 3-10t/d, so that the further improvement of the recovery ratio of the main oil reservoir in the area is realized, and the method has better economic benefit and popularization effect.
Claims (6)
1. A method for identifying a dominant seepage passage is characterized by comprising the following steps:
1) acquiring geological elements influencing the dominant seepage channel of the area to be identified;
2) determining an injection-production well pattern according to the historical well pattern adjustment data, and determining the water yield of an oil well in the injection-production well pattern;
3) determining the water passing times and the average permeability between oil wells and water wells in the injection-production affected direction;
4) performing interactive analysis on the obtained water passing multiple and average permeability to determine the dominant channel division standard;
5) and performing semi-quantitative identification on the dominant seepage channel of the target area by using the obtained dominant channel division standard.
2. The method for identifying a dominant seepage flow channel according to claim 1, wherein the step 2) is implemented as follows:
a. counting the water injection well and the oil production well to determine an injection and production well pattern;
b. determining that the oil production well in the historical injection and production well network is a unidirectional corresponding well number or a multidirectional corresponding well number;
c. determining the yield splitting coefficient in the injection-production corresponding direction by using the permeability of the oil well, the permeability of the water well and the well spacing of the oil well and the water well;
d. and determining the water yield of the oil well in the injection and production well network according to the yield splitting coefficient.
3. The method for identifying the dominant seepage flow channel of claim 2, wherein the formula for calculating the yield splitting coefficient γ is as follows:
γ＝(K1+K2)/2L2
wherein K1For the permeability of the oil well in the injection-production well network, K2Is the permeability of the well, L1The well spacing of the oil-water well is adopted.
4. The method for identifying the dominant seepage flow channel of claim 1, wherein the determination process of the water passing multiple in the step 3) is as follows:
A. counting the perforation thickness of an oil-water well in an injection-production well network, and determining the average thickness in different injection-production directions;
B. calculating the recovery ratio and the single storage coefficient of the area to be identified, and determining the swept area in different injection and production directions according to the obtained average thickness and the parameters obtained in the step 2);
C. and determining the water passing times in different injection and production directions according to the swept areas.
5. The method for identifying a dominant seepage pathway of claim 4, wherein the step B is performed by using a medium wave and an area S1The calculation formula of (2) is as follows:
wherein ERFor recovery, beta is the single storage coefficient, Q1In order to inject and extract the water yield of the oil well in the well network,
the average thickness in different injection and production directions.
6. The method of claim 1, wherein the geological features include reservoir formation, sedimentary microfacies, porosity, permeability, heterogeneity, and oil bearing area.
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| CN117422001B (en) * | 2023-12-19 | 2024-04-02 | 东北石油大学三亚海洋油气研究院 | Dominant seepage channel determining method, device, equipment and storage medium |
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