Numerical Simulation Study On Converting Development Patterns Of Block L6

The neogene margin bottom water reservoir in huabei oilfield is an important type of reservoir with abundant reserves and wide distribution.The reservoir is characterized by stable reservoir distribution,good reservoir physical property,poor crude oil property and sufficient energy of bottom and edge water.Due to the high viscosity of crude oil,the reservoir edge water penetration is serious,resulting in small water drive swept volume;At the same time,the degree of reservoir utilization is high and it is difficult to stabilize the oil production.Therefore,it is necessary to explore new development methods and technologies for such reservoirs.This paper takes the block reservoir L6 with the coexistence of edge and bottom water as an example to study the transformation development mode of natural energy development reservoir.By studying the exploitation mechanism and water flooding law of the reservoir on the basis of reservoir geological characteristics and analysis of development status,the energy of the reservoir is calculated by reservoir engineering analysis method.Then the numerical simulation technique is used,on the basis of history matching and residual oil potential analysis,the conventional potentiometric measures and the scheme index prediction of converting natural water flooding to artificial water flooding are carried out.The research results show that reservoir L6 edge water propulsion rate is mainly affected by sedimentary microfacies,well layout,perforation time and fluid recovery strength.While the coning speed of bottom water in bottom water reservoir depends on the degree of perforation in oil reservoir and production pressure difference.The existence of interlayer can also prevent the coning of bottom water and delay the water appearance time of oil well.The bottom and edge water energy of the L6 is sufficiently and the water is active,the current rate of water invasion has been reached about 33×10~4m~3/a,the main idea of the next step adjustment program is slow the edge water advance and control bottom water coning.In this study,reservoir engineering methods and numerical simulation techniques were used to determine the distribution area of residual oil potential of the L6,and targeted conventional potential exploitation countermeasures were designed,and the combination of different development and adjustment schemes forms different development solutions.At the same time,the natural water flooding to artificial water flooding scheme is proposed,and the development index is predicted by numerical simulation,through the optimization demonstration of water injection well group,water injection horizon,water injection policy,profile controlling and flooding,it is concluded that the major measure of reservoir is conventional measure in next adjustment,and the depth profile modification and flooding technology can be carried out in the later stage.This study provides strong technical support for the development of the L6.