Research On Water Injection Development Adjustment Of X Fault Block Reservoir

In the development of our country's oil field,Complex fault block reservoir is a very important type of reservoir,Its reserves and output occupy a very important position.But compared to the integrity reservoir,the reservoir structure of this type is very complex.In the plane,the reservoir is cut into small and broken blocks.In the longitudinal direction,it usually has many oil-bearing formations,but the degree of enrichment varies greatly.With the development of reservoir,the problems of monolayer breakthrough,difficulty to control the direction of water dive and low level of formation energy retention have become the negative factors that restrict the stable production of complex fault block reservoirs.Therefore,the development and adjustment of complex fault block reservoirs and the improvement of water flooding effect are important subjects in oil field development.Y block is a typical complex fault block reservoir,and X fault block is located in the middle of block Y.It is the main fault block of this block.X fault block was put into development in 1987,the development of water injection for many years makes the remaining oil distribution of reservoir extremely complicated.In the development process,the water flooding in the well is serious due to the influence of the heterogeneity of the plane,interlayer and layer.At the same time,the water flooding control degree and producing degree are low due to the influence of some oil and water wells back layer.The existing formation and well pattern can not be fully adapted to the need of fault block reservoir development,so it is necessary to study the adjustment of water injection development.This paper mainly completed the following research work:(1)Analyzed the various stages of development characteristics of X fault block reservoir,and according to the reservoir properties,fluid properties and production dynamic data,the recovery ratio of X fault block reservoir is 16.8%by using empirical formula method,Tong chart method and water flooding characteristic curve method.(2)The X fault block reservoir is studied in terms of formation characteristics,structural characteristics,reservoir characteristics and reservoir characteristics,The results show that the X fault block stratum thickness is big;complicated structure,fault development;sand body connectivity in plane is poor,The reservoir area of single sand layer is small,and the reservoir heterogeneity is strong;multiple oil-bearing series,The concentration of oil and gas is different in each layer;it brings great difficulties to development.(3)using seismic and logging data,three dimensional geological model of X fault block reservoir is established in terms of faults,structures and attributes;The three-dimensional geological model of coarsening,combined with block PVT experimental data and dynamic production data,establish X fault block oil reservoir numerical simulation model,then the reserves,formation pressure and development index are fitted,finally on the distribution of remaining oil were studied(4)We optimized parameters using the method of numerical simulation and reservoir engineering combined with the production parameters such as well pattern and well spacing,production pressure difference and injection-to-producing-well ratio,extraction time,return time,injection pressure to provide basis for the development.(5)Based on the optimization of injection production parameters and section division,the development characteristics of X fault block reservoir,the distribution of remaining oil,and the control degree of the block reserves and well network adaptability,the development,adjustment and optimization plan for X fault block was formulated,Predict the develop indicators of the programs by the Eclipse numerical simulation software.The suitable adjustment programs of the X block reservoir were optimized.