Study Fine Adjustment Method For Water Flooding In Type Ⅱ And Type Ⅲ Oil Reservoirs In East Fault Of Block BEIYI

After chemical flooding of Type Ⅱ oil layers in the Sazhong Development Area,the horizontal and vertical differences have further increased.The remaining Type Ⅲ oil reservoirs have small effective thickness and severe interlayer interference,resulting in poor economic benefits.The proportion of Type Ⅲ reserves in the PⅠ5-PⅡ10 interval is close to half,and it is urgent to explore a development method of synchronous and efficient development of Type Ⅱ and Type Ⅲ oil layers with one set of well patterns and different perforation sequences.This article focuses on the severe horizontal and vertical interactive distribution of the Type Ⅱ and Type Ⅲ oil layers in the block,and conducts measures transformation and comprehensive adjustment research to reduce the differences in the plane and vertical distribution of the Ⅱ and Ⅲ types of oil layers,achieve uniform utilization of the Ⅱ and Ⅲ types of oil layers,synchronously tap potential,and complete the fine adjustment method research and numerical simulation prediction during the water drive stage.In this paper,based on the actual production situation of the test area in the B1,the eastern second and third block,using geological data and well pattern information within the scope of the work area,a three-dimensional geological modeling software is used to establish a layer model,structural model,sedimentary facies model,and attribute model of the work area.The Petrel RE module is used to establish a numerical model,and historical matching is performed on the test area to correct geological parameters.Based on historical matching,the types and distribution of remaining oil were analyzed,and the utilization and distribution of various sand bodies in the plane and vertical oil layers were calculated.The remaining oil was finely quantified according to sedimentary facies and effective thickness.The remaining oil was summarized into Type Ⅲ:longitudinal heterogeneity,plane phase transformation,and high starting pressure gradient difficult to produce.Different types of remaining oil quantification results were provided.The current perforation mode in the experimental area synchronizes the perforation of the Type Ⅱ and Type Ⅲ of oil layers in the eastern region with small oil layer development thickness,while the perforation of the western region with large oil layer development thickness is carried out step by step.The Type Ⅲ is first perforated and the water drive is refined to tap the potential,and then the Type Ⅱ is replenished.Based on the geological characteristics and development process of the experimental area,a study was conducted on the precise measures,potential tapping,and adjustment methods for the experimental area.A complete integrated fracturing and production measure method was designed to utilize the longitudinal heterogeneous remaining oil in the eastern area and the difficult to use remaining oil in the western area with a large starting pressure gradient.Design a shallow profile control plan for Type Ⅱ using fuzzy comprehensive evaluation method,and improve interlayer contradictions by utilizing longitudinal heterogeneous residual oil through shallow profile control measures.The dynamic adjustment method for well groups mainly adjusts the pressure difference between wells by calculating the seepage resistance,improves the injection production relationship,and solves the problem that the seepage resistance in the fracturing direction of the five point method well group is lower than that in other directions,resulting in uneven flow velocity in the four directions and between layers of the well group.This achieves dynamic balance of flow velocity in all directions of the well group and evenly utilizes remaining oil.By conducting periodic oil recovery on the"three high" wells,the problem of difficulty in limiting layered water injection layers is solved,and the remaining oil formed by plane contradictions is utilized.By combining the above refined potential tapping measures and adjustment methods,it is expected to increase the recovery rate by 3.38%when simulating and predicting a comprehensive water content of 98%in the experimental area.This article provides a favorable basis for the next development and adjustment of the block by studying the fine adjustment methods in the water drive stage of the experimental area.