Study On The Main Control Factors And Optimization Of Horizontal Well Development In Ultra-low Permeability Reservoirs

With the development of hydraulic fracturing technology,China's ultra-low permeability reservoirs can achieve large-scale commercial exploitation.In view of the problems such as water invasion and difficulty in establishing effective displacement in the development process of CQ ultra-low permeability oil reservoir,the main controlling factors affecting water flooding are analyzed,and the factors such as well pattern,fracture pattern and development modes are studied.First of all,this paper analyzes the main controlling factors of horizontal well in the ultra-low permeability reservoirs,and studies the well pattern,fracture pattern,reservoir factors and development methods.Based on that,numerical simulations of well distance,fracture spacing,fracture length,sand body connectivity and development modes are carried out,and reasonable well and fracture parameters are obtained.Secondly,taking different sand formation conditions into account,the large-scale continuous sand,medium-scale continuous sand body and small-scale non-continuous sand body are analyzed by numerical simulation,to obtain reasonable development mode of horizontal well in different geological models and reasonable ranging plate of ultra-low permeability reservoir under different permeability.Finally,according to the combined geological characteristics of different modes,the well pattern and fracture pattern of large-scale continuous sand body,medium-scale sand body and small-scale non-continuous sand body are optimized and development suggestions are given.The results of this paper are of guiding significance to the engineering design and policy optimization of flooding in the ultra-low permeability reservoirs.