CN-121993174-A - Dynamic data-based two-drive injection well plugging layer leakage identification method

CN121993174ACN 121993174 ACN121993174 ACN 121993174ACN-121993174-A

Abstract

The invention relates to the technical field of tertiary oil recovery in oilfield development, in particular to a two-drive injection well plugging layer leakage identification method based on dynamic data. The method comprises the steps of determining a target chemical flooding block, obtaining reference dynamic development data, screening target dynamic development data corresponding to a target injection well group, classifying the target dynamic development data, analyzing the dynamic change characteristics of the target dynamic development data, analyzing the correlation coefficient between the dynamic development data and the dynamic change characteristics, determining target characteristic parameters, building a target identification evaluation model according to the target characteristic parameters, obtaining a target limit value, building a target identification judgment standard according to the target limit value, determining target characteristic parameter judgment weights, building a target characteristic parameter judgment weight pattern, and quantitatively identifying a target injection well according to the target identification judgment standard and the target characteristic parameter judgment weight pattern. The method provided by the invention effectively guides the on-site manual judgment to improve the recognition accuracy and efficiency and improve the chemical flooding development effect.

Inventors

FAN YU
WEI CHANGQING
LIU GUOCHAO
LIU HAIBO
ZHOU XUAN
CAI ZHIBIAO
GAO QIAN
PAN FENG
LI DAN
CAO RUIBO
GAO KUN
LIANG GUOLIANG
ZHONG CONGXIN
ZHOU CONGCONG
YAN WEI
LI BO
WANG LIHUI

Assignees

大庆油田有限责任公司
中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (12)

1. The utility model provides a two-drive injection well plugging layer leakage identification method based on dynamic data, which is characterized by comprising the following steps: step S1, determining a target chemical flooding block, and acquiring reference dynamic development data of an injection well and a production well of the target chemical flooding block and a water flooding injection chemical flooding target layer of the same layer; Step S2, selecting a target injection well group from the target chemical flooding block determined in the step S1, screening target dynamic development data corresponding to the target injection well group according to the reference dynamic development data determined in the step S1, processing the target dynamic development data, and calculating the change condition of the target dynamic development data; Step S3, classifying the target dynamic development data determined in the step S2 according to the classification conditions of the two-drive injection well groups, and respectively analyzing the dynamic change characteristics of the respective drive well groups; step S4, according to a Pearson correlation analysis method, respectively analyzing correlation coefficients between dynamic development data of respective well flooding groups and dynamic change characteristics corresponding to the respective well flooding groups, and determining target characteristic parameters corresponding to the respective well flooding groups by referring to the correlation coefficients calculated by a nonlinear curve regression method; Step S5, establishing target identification evaluation models corresponding to respective well flooding groups according to the target characteristic parameters acquired in the step S4 and a data regression statistical analysis method, acquiring corresponding target limit values according to the target identification evaluation models, and establishing target identification judgment standards corresponding to the respective well flooding groups according to the target limit values; step S6, determining target characteristic parameter judgment weights of the target injection well groups determined in the step S2 according to the well number proportion of the dynamic change characteristics of the respective well driving groups determined in the step S3, and establishing a target characteristic parameter judgment weight plate; And step S7, quantitatively identifying the target injection wells of the respective drives determined in the step S3 according to the target identification determination standard determined in the step S5 and the target characteristic parameter determination weight plate determined in the step S6.
2. The method for identifying lost circulation of a plugging layer of a two-drive injection well based on dynamic data according to claim 1, wherein in the step S1, the reference dynamic development data at least includes injection pressure, daily injection amount, injection concentration, injection viscosity, liquid production amount, oil production amount, water content, concentration of production, flow pressure and submergence.
3. The method for identifying lost circulation of two-drive injection well plugging layers based on dynamic data according to claim 1, wherein in the step S2, the target injection well group is an injection well group in which a target chemical flooding block appears in a chemical flooding development process and lost circulation of the plugging layers is confirmed.
4. The method for identifying lost circulation of two-drive injection well plugging layers based on dynamic data according to claim 3, wherein the target dynamic development data is dynamic development data of an injection well group in which the plugging layers are lost.
5. The method for identifying lost circulation of two-drive injection well plugging layers based on dynamic data according to claim 1, wherein in the step S3, the two-drive injection well groups comprise water-drive same-layer injection well groups and chemical-drive return-layer injection well groups, the target dynamic development data comprise water-drive same-layer injection well group dynamic development data and chemical-drive return-layer injection well group dynamic development data, and the dynamic change feature classification comprises water-drive same-layer injection well group plugging layer lost circulation well groups dynamic change features and chemical-drive return-layer injection well group plugging layer lost circulation well groups dynamic change features.
6. The method for identifying leakage of two-drive injection well plugging layers based on dynamic data according to claim 5, wherein in the step S4, according to the characteristics of the leakage dynamic change of the plugging layers of the injection well group of the water drive same-layer system and the dynamic development data of the leakage plugging layers of the injection well group of the water drive same-layer system, according to the Pearson correlation analysis method, the correlation coefficient between the various dynamic development data change values and the leakage of the plugging layers is calculated, and meanwhile, the correlation coefficient calculated by referring to the nonlinear curve regression method is referred to, preferably, the target characteristic parameter is obtained, and the correlation coefficient of the target characteristic parameter is 0.3-0.7.
7. The method for identifying leakage of two-drive injection well plugging layers based on dynamic data according to claim 5, wherein in the step S4, according to dynamic change characteristics of the leakage of the plugging layers of the injection well group of the chemical drive return layer and dynamic development data of the injection well group of the chemical drive return layer, according to a Pearson correlation analysis method, correlation coefficients between various dynamic development data change values and leakage of the plugging layers are calculated, and meanwhile, target characteristic parameters are preferably selected by referring to correlation coefficients calculated by a nonlinear curve regression method, wherein the correlation coefficients of the target characteristic parameters are 0.3-0.7.
8. The method for identifying leakage of two-drive injection well plugging layers based on dynamic data according to claim 5, wherein in the step S5, the target identification and evaluation model is a water-drive same-layer injection well group plugging layer leakage identification and evaluation model or a chemical drive return injection well group plugging layer leakage identification and evaluation model based on dynamic development data.
9. The method for identifying leakage of two-drive injection well plugging layers based on dynamic data according to claim 8, wherein the target threshold value is a quantitative characteristic parameter threshold value of dynamic development data of a well group to be evaluated, and the target identification judgment standard is a water-drive same-layer injection well group plugging layer leakage target characteristic parameter identification judgment standard or a chemical drive return layer injection well group plugging layer leakage target characteristic parameter identification judgment standard.
10. The method for identifying lost circulation of two-drive injection well plugging layers based on dynamic data according to claim 1, wherein in the step S6, the target characteristic parameter determination weight pattern is a plugging layer lost circulation well dynamic characteristic parameter determination weight pattern.
11. The method for identifying leakage of two-drive injection well plugging layers based on dynamic data according to claim 9, wherein the step of obtaining the target characteristic parameter judgment weight pattern is to determine the target characteristic parameter judgment weight of the plugging layer leakage well of the target injection well group according to the well number proportion of the dynamic characteristics of the plugging layer leakage well of the injection well group of the same layer of water drive and the well number proportion of the dynamic characteristics of the plugging layer leakage well group of the chemical drive return layer injection well group, and establish the target characteristic parameter judgment weight pattern according to the target characteristic parameter judgment weight.
12. The method for identifying lost circulation of two-drive injection well plugging layers based on dynamic data according to claim 5, wherein in the step S7, the target injection well comprises a water-drive same-layer plugging layer lost circulation injection well and a chemical-drive present-layer plugging layer lost circulation injection well.

Description

Dynamic data-based two-drive injection well plugging layer leakage identification method Technical Field The invention relates to the technical field of tertiary oil recovery in oilfield development, in particular to a two-drive injection well plugging layer leakage identification method based on dynamic data. Background At present, with the continuous expansion of chemical flooding scale, chemical flooding well patterns are gradually developed in a layer returning mode, and meanwhile, the well pattern density is increased, and the water aggregation two-drive co-injection horizon is increased, so that the sealing performance of the plugging horizon of the injection and production well is ensured, and the injection and production well has an important effect on realizing independent development of two-drive strata and efficient displacement of chemical flooding. In actual production, if the water flooding injection well plugging layer of the perforation chemical flooding layer is not sealed, the water flooding injection well plugging layer can cause foreign water to invade the chemical flooding target layer, so that chemical flooding slugs are diluted and destroyed, the viscosity of a chemical agent solution is reduced, the oil-water fluidity ratio is reduced, effective displacement is difficult to form, the chemical agent solution is injected into a non-chemical flooding target layer, the utilization rate of the chemical agent is reduced, and meanwhile, a pressure system and the injection and extraction balance are influenced, so that the oil production well is poor in efficiency. In order to ensure the development effect of the three-mining area block, in recent years, two-drive interference treatment is strictly executed, but due to the fact that leakage of a plugging layer is hidden, a simple and effective monitoring means is lacking, the problems that the sealing performance is not monitored in place, the identification efficiency of a leakage well is low, the discovery is not timely and the like still exist in the development process. At present, each domestic oil field monitors and identifies the sealing condition of the plugging layer of the two-drive injection well mainly according to an empirical method and a profile test method, and a plurality of experiments prove that the common technology has the following problems that firstly, the conventional leakage identification relies on the empirical method, the discrimination accuracy and the identification efficiency are low, the empirical method is a qualitative evaluation method, when the conventional method relies on the empirical method for analysis, the non-standard and quantitative determination method is not used, the influence of the insufficient discrimination experience and individual difference of the plugging failure of dynamic analysts is avoided, the difference of the identification result is large, the discrimination inaccuracy is low, the identification efficiency is low, and secondly, the profile test method has the problems of low monitoring frequency, large workload, high cost and the like, so that the whole coverage of the two-drive injection well is difficult to realize in time when the leakage well is multiple in the same period. Therefore, the two-drive injection well plugging layer leakage identification method based on dynamic data is provided for overcoming the defects. Disclosure of Invention First, the technical problem to be solved The invention provides a two-drive injection well plugging layer leakage identification method based on dynamic data, which aims to solve the problems that in the prior art, due to the fact that the plugging layer leakage is hidden, a simple and effective monitoring means is lacking, the sealing performance is not monitored in place in the development process, the leakage well identification efficiency is low, the discovery is not timely and the like. (II) technical scheme In order to solve the problems, the invention provides a two-drive injection well plugging layer leakage identification method based on dynamic data, which comprises the following steps: step S1, determining a target chemical flooding block, and acquiring reference dynamic development data of an injection well and a production well of the target chemical flooding block and a water flooding injection chemical flooding target layer of the same layer; Step S2, selecting a target injection well group from the target chemical flooding block determined in the step S1, screening target dynamic development data corresponding to the target injection well group according to the reference dynamic development data determined in the step S1, processing the target dynamic development data, and calculating the change condition of the target dynamic development data; Step S3, classifying the target dynamic development data determined in the step S2 according to the classification conditions of the two-drive injection well groups, and respecti