CN113283648B - Prediction method suitable for high-water-content old-area residual oil - Google Patents
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Abstract
The invention provides a prediction method suitable for residual oil in a high-water-content old zone, which divides single well logging phases and determines all well logging Xiang Leixing; dividing the water content of the current production oil well, and determining the water content classification of the well region; dividing physical properties of all oil-water wells, and determining physical property classification of the well areas; splitting calculation of each monolayer, and determining production data of each monolayer of all oil-water wells; carrying out multi-parameter hierarchical superposition to determine the distribution range and the residual reserve of the residual oil; overlapping different logging phase bands with water in an oil well, and determining water content classification of the different logging phase bands; overlapping the physical properties of the same logging phase with the water content of the well, and determining the water content classification of the wells with different physical properties; the well zone of the lowest stage in the water cut is described and the remaining oil distribution area is determined. The invention effectively solves the problem that the distribution of the residual oil is not known clearly due to the factors of strong heterogeneity of the reservoir, complex and changeable spreading, water-breakthrough and effect law and the like of the main force sand body of the old region.
Description
Technical Field
The invention belongs to the field of prediction of distribution rules of residual oil, and particularly relates to a prediction method suitable for high-water-content old areas.
Background
At present, a plurality of methods for researching the distribution of residual oil at home and abroad mainly comprise the following steps: a geology-based approach; a method mainly based on oil reservoir engineering theory; carrying out mathematical statistical analysis on mine site data; a well logging-based method; geophysical based methods; inspection well coring analysis method. However, since the distribution of the remaining oil is affected by many factors, there is still no economical, applicable, convenient and effective method for popularization and application.
The analysis methods commonly used in mines at present are as follows: and firstly, a reservoir numerical simulation method. Through fine reservoir geological modeling, reservoir numerical simulation is performed by using computer modeling software, and important parameters representing the distribution of the residual oil, such as the saturation of the residual oil, the saturation of the movable oil, the abundance of the residual reserves, the abundance of the residual recoverable reserves, the extraction degree and the like of the simulated layer are calculated. The macroscopic distribution of the residual oil is obtained, and the knowledge of the residual oil is referred. And secondly, a dynamic analysis method. According to the water injection effect relation, the historical injection well pattern is combined with dynamic monitoring data (tracer, water absorption profile and the like), a water injection main flow chart of each single layer is made, and the main flow direction of injected water and the plane flooding condition are intuitively judged. The specific distribution position of the residual oil at the side edge of the waterline can not be judged.
Disclosure of Invention
The invention aims to solve the technical problems that: a prediction method suitable for high-water-content old-area residual oil is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for predicting the residual oil in the high-water-content old area is characterized by comprising the following steps of: the method comprises the following steps:
S1, dividing single well logging phases, determining all well logging Xiang Leixing, and obtaining a logging phase zone distribution diagram;
s2, dividing the water content of the current production oil well, and determining the water content classification of the well region;
S3, dividing physical properties of all oil-water wells, and determining physical property classification of the well areas;
S4, carrying out splitting calculation on each monolayer on the output and injection quantity of all the oil-water wells, and determining production data of each monolayer of all the oil-water wells;
s5, carrying out multi-parameter grading superposition, and then combining the upper cross geological reserves to determine the distribution range of the residual oil and the residual recoverable reserves; the multi-parameters comprise logging phase, water content, reservoir physical properties, accumulated oil recovery and accumulated water injection quantity, and the accumulated oil recovery and the accumulated water injection are obtained from production data;
S6, overlapping different logging phase bands with water of an oil well, and determining water content classification of the different logging phase bands;
S7, overlapping physical properties of the same logging phase zone oil well with water content of the oil well, and determining oil well water content classification of the well zones with different physical properties;
S8, describing the well region of the lowest stage in the water-containing classification, and determining the residual oil distribution region.
The types of well logging phases include fingers, funnels, and bells, as described above.
According to the method, the water-containing classification is specifically divided into the following 5 grades: the water content is more than or equal to 90% and less than 100%, the water content is more than or equal to 80% and less than 90%, the water content is more than or equal to 70% and less than or equal to 80%, the water content is more than or equal to 60% and less than 70%, and the water content is less than 60%.
According to the method, the physical property classification of the well region in the S3 is specifically divided into the following 7 grades: 270-280, 280-290-300, … … -340.
The beneficial effects of the invention are as follows: the method is convenient and applicable, has strong actual combat performance, has strong practicability and popularization value, and can dig out residual oil in more old-fashioned adjustment.
Drawings
FIG. 1 is a schematic diagram of well logging in a well zone according to an embodiment of the present invention.
FIG. 2 is a schematic illustration of well water in a well zone according to one embodiment of the present invention.
FIG. 3 is a schematic diagram of the phase zone water content of a well zone according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of well zone infundibulate phase well properties according to an embodiment of the invention.
FIG. 5 is a schematic illustration of well zone infundibulated phase well water containing according to an embodiment of the invention.
FIG. 6 is a schematic diagram showing the water distribution of different physical properties of a funnel phase of a well region according to an embodiment of the present invention.
FIG. 7 is a plot of the water-bearing zone distribution of different phase zones for a well zone according to an embodiment of the present invention.
FIG. 8 is a schematic diagram of a well injection well sweep area distribution according to an embodiment of the present invention.
FIG. 9 is a plot of low water content region profile for a well region with water injection subtracted in accordance with one embodiment of the present invention.
FIG. 10 is a well oil accumulation distribution diagram of a well according to an embodiment of the present invention.
FIG. 11 is a plot of current residual oil reserves for a well according to an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to specific examples and figures.
All oil-water wells include all oil wells, all oil wells including current production wells and abandoned wells, and all water wells including current production wells and abandoned wells. The well zone is a zone containing an oil-water well. The reservoir comprises several monolayers in the longitudinal direction.
The invention provides a prediction method suitable for high-water-content old-fashioned residual oil, which comprises the following steps:
s1, dividing the single well logging phases, and determining all well logging Xiang Leixing of the well region.
In this embodiment, the characteristic of the well curve of a well Shan Jingce is classified to define the distribution range and rule of the microphase of well deposit, which are classified into three types of finger, funnel and bell.
S2, dividing the water content of the current production oil well, determining the water content classification of the well region, and determining the current residual oil state of the reserves of the single well control region. In this example, the aqueous classification is specifically classified into the following 5 stages: the water content is more than or equal to 90% and less than 100%, the water content is more than or equal to 80% and less than 90%, the water content is more than or equal to 70% and less than or equal to 80%, the water content is more than or equal to 60% and less than 70%, and the water content is less than 60%.
S3, dividing physical properties of the well in the well region, and determining the classification of the physical properties of the well region. In this example, the physical properties of the well region were classified into the following 7 stages: 270-280, 280-290-300, … … -340.
S4, splitting the output and injection quantity of the well in the well region into each single layer, and calculating to determine the production data of each single layer of each well in the well region. In the embodiment, a single-well single-layer yield is obtained by adopting a single-well common yield splitting method.
S5, carrying out multi-parameter hierarchical superposition, determining the distribution range of the residual oil, and defining the analysis method and thought of the residual oil under the complex flooding condition of the old area. The multiple parameters include logging phase, water content, reservoir physical properties, accumulated oil recovery and accumulated water injection, the accumulated oil recovery and the accumulated water injection being obtained from production data.
S6, overlapping different logging phase zones with the water content of the oil well, and determining the water content grade of the different logging phase zones. The method comprises the following steps: the bell-shaped oil well has high water content, funnels shape, and lowest finger.
S7, overlapping the physical properties of the oil well and the water content of the oil well with the logging phase, the water cut of the wells in the different physical areas was determined.
S8, describing the well region of the lowest stage in the water-containing classification, and determining the residual oil distribution region.
Through description and classification of each required parameter, hierarchical overlapping of each parameter in this embodiment is performed below.
1) Water cut rating description of different well-logging zones. The well logging phase (figure 1) and the well water content (figure 2) parameters are superimposed by statistics in the northwest area of a well zone, and the bell-shaped well is found to have high water content, funneled shape and lowest finger (figure 3).
2) Water content rating description of different physical properties of the same logging phase zone. Taking the funnel phase as an example, the physical properties of the oil well (figure 4) are overlapped with the water content of the oil well (figure 5), and the water content of the well with good physical properties (the acoustic time difference is more than or equal to 300) is found to be higher than 90%, and the water content of the well with relatively poor physical properties (the acoustic time difference is less than 300) is found to be relatively low, namely, between 60 and 80% (figure 6).
3) Based on the characteristics of different phase bands and different physical properties of the same phase band. It is found that the low water content zone is mainly concentrated in the funnel-shaped zone or the bell-shaped zone, and the physical property of the funnel-shaped zone is poor. From the data, the low water-bearing zone is mainly concentrated in the region with acoustic time difference < 300 (FIG. 7).
4) By overlapping the distribution map of the low water-bearing zone and the accumulation distribution (figure 8), a zone (figure 9) of the low water-bearing zone, which is used for deducting the water injection wave of the water injection well and contains 100% of water, is obtained, and by overlapping the distribution map of the accumulation zone and the accumulation distribution map (figure 10), a zone of higher accumulation is deducted, and a zone of relatively enriched oil in the low water-bearing zone, namely a zone of enriched oil in the well zone, is found (figure 11).
5) Based on the phase zone division, according to the single-well single-layer cumulative production condition, combining the research results of the residual oil enrichment zone, and finally, quantitatively describing the residual oil in the residual oil enrichment zone at 7 positions (figure 11).
The distribution condition of the residual oil of the No. 5 sand body of the well zone is defined by a description and research method of the residual oil of the sedimentary facies zone. Based on the above knowledge, the finger-shaped areas 4-41 and 2-7 are considered to have poor physical properties near the well, less production amount and rich residual oil. The funnel-shaped areas with poor physical properties are 5-51, 5-3 and M72XC, MX54 and 8-2 with poor physical properties, the yield is less, and the residual oil is enriched. By carrying out stoping No. 5 single layer on 5-3, 5-51 and 4-41, daily oil is increased by 3.6 tons, and accumulation oil is increased by 1461 tons.
By using the method, the residual oil prediction is carried out on 5 oil field well areas of the area, and a residual oil enrichment distribution diagram is drawn. Lays a foundation for development of subdivision layers and adjustment of plane injection and production.
The above embodiments are merely for illustrating the design concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, the scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications according to the principles and design ideas of the present invention are within the scope of the present invention.
Claims (5)
1. The method for predicting the residual oil in the high-water-content old area is characterized by comprising the following steps of: the method comprises the following steps:
S1, dividing single well logging phases, determining all well logging Xiang Leixing, and obtaining a logging phase zone distribution diagram; the well logging phase types include finger, funnel and bell;
s2, dividing the water content of the current production oil well, and determining the water content classification of the well region;
s3, dividing physical properties of all oil-water wells, and determining physical property classification of the well areas; the physical property is specifically acoustic time difference;
s4, carrying out splitting calculation on each monolayer on the output and injection quantity of all the oil-water wells, and determining production data of each monolayer of all the oil-water wells; calculating by adopting a single well yield splitting method to obtain single well single layer yield;
S5, carrying out multi-parameter hierarchical superposition, and then determining a residual oil distribution range and residual reserves by combining with the geological reserves; the multi-parameters comprise logging phase, water content, reservoir physical properties, accumulated oil recovery and accumulated water injection quantity, and the accumulated oil recovery and the accumulated water injection are obtained from production data;
s6, overlapping different logging phase bands with water of an oil well, and determining water content classification of the different logging phase bands; the oil well logging phase and the water content parameters of the oil well are overlapped through statistics, and the bell-shaped oil well is found to have high water content, the funnel shape is inferior, and the finger is the lowest;
S7, overlapping physical properties of the same logging phase zone oil well with water content of the oil well, and determining oil well water content classification of the well zones with different physical properties; the method specifically comprises the following steps: based on the water content levels of different phase zones and the water content levels of different physical properties of the same phase zone, obtaining the areas in which the low water content areas are mainly concentrated in the logging phase types of the wells; the data shows that the low-water-content area is mainly concentrated in the area of which acoustic wave time difference;
S8, describing a well region of the lowest stage in the water-containing classification, and determining a residual oil distribution region; the method specifically comprises the following steps: and overlapping the distribution map of the low water-bearing zone with the accumulation and injection distribution to obtain a zone with the low water-bearing zone deducting 100% of water injected into the water injection well, overlapping the zone with the accumulation and production distribution map, deducting a zone with higher accumulation and production, and finding out a zone with relatively enriched residual oil in the low water-bearing zone, namely a zone with enriched residual oil.
2. The method according to claim 1, characterized in that: the water-containing classification is specifically divided into the following 5 stages: the water content is more than or equal to 90% and less than 100%, the water content is more than or equal to 80% and less than 90%, the water content is more than or equal to 70% and less than or equal to 80%, the water content is more than or equal to 60% and less than 70%, and the water content is less than 60%.
3. The method according to claim 1, characterized in that: the acoustic time difference of the well region in the S3 is specifically divided into the following 7 stages: the sound wave time difference is more than or equal to 270 and less than or equal to 280, the sound wave time difference is more than or equal to 280 and less than or equal to 290, the sound wave time difference is more than or equal to 290 and less than or equal to 300, … … and less than or equal to 330 and less than or equal to 340.
4. The method according to claim 1, characterized in that: all oil-water wells include all oil wells and all water wells, all oil wells include current production wells and abandoned oil wells, and all water wells include current production wells and abandoned water wells.
5. The method according to claim 1, characterized in that: the S7 specifically comprises the following steps: the logging is similar to a funnel type, and the water content of the well with good physical properties is higher than 90%; relatively poor wells have relatively low water content, between 60-80%; the physical property is better that the acoustic time difference is more than or equal to 300, and the physical property is relatively worse that the acoustic time difference is less than 300.
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