The Study Of Reasonable Well Pattern Deployment In Chang2Reservoir Of Gaojia Gou Oil Field

The development efficiency of low permeability oilfield or reservoir is at a low level due to poor reservoir properties, the big resistance of fluid flow and strong heterogeneity, so it is necessary to replenish formation energy by the water flooding;because the exploitation of low permeability oilfield commonly used fracturing to improve well productivity in the early days, the presence of cracks in low permeability reservoir exacerbate the physical properties (mainly permeability) of the anisotropy and heterogeneity, which reflects the different characteristics of low permeability reservoirs and conventional oil reservoirs, Therefore, the development of well pattern must be considered with the fracture system in a reasonable match; It can be said that whether the development of well pattern is reasonable or not is the key to success or failure of water flooding in low permeability oilfield.This paper calculated the natural recovery and simulatd the formation pressure of chang2reservoir of Gaojiagou oilfield,the study shows the natural recovery at a low level and the formation pressure seriously reduced.it is time to improved formation pressure by water flooding,in full of understanding the geological characteristics of the chang2reservoir of Gaojiagou oilfield, Numerical simulation and reservoir engineering methods was used to choose the reasonab well pattern, well density and well space.There are several main innovations in this paper as follows:1.Investigated the Widely used well patterns of low permeability oilfield and analyzed their advantages and disadvantages and specific application;2.Analyzed the relationship between water sweep efficiency、degree of waterflooding control、well injection intensity and the well pattern as well as the influence of cracks in the reservior;3.Studied the reservoir properties、heterogeneity and analyzed the sensitivity and wettability of the reservoir;4.Based on studying the well pattern of low permeability oilfield, used numerical simulation and reservoir engineering methods choosed the reasonable well pattern、well density and well space of Gaojiagou oilfield; 5.Based on Establishing a geological model and taking history matching, used numerical simulation optimized the injection and production parameters;6.Calculated the waterflooding recovery of chang2reservoir of Gaojiagou oilfield.