Study On The Development Mode Of Multi-fracturing Horizontal Well In Glutenite Reservoir

The main oil-containing layers of the glutenite reservoirs in the Yanjia area are sand-three and sand-four.Its proven geological reserve is about 2×10~7t and the oil-containing area is 11.6km~2.The distribution of glutenite reservoirs in China is relatively small,and their distribution and reservoir properties are quite different from those of conventional oil and gas reservoirs.Glutenite reservoirs have poor physical properties,complex distribution,strong heterogeneity and weak layer connectivity.The attenuation of formation energy is relatively rapid,and it has the characteristics of“no injection,no mining”.Therefore,how to make full use of characteristics of glutenite reservoir,make the disadvantage to advantage,overcome the contradictions,solve problems,using the thought of science and technology,the rational development of glutenite reservoir,fully mobilize the capacity to provide new impetus for the entire field,become the primary problem of oilfield development decision makers.In this paper,Yanjia area 227 blocks of glutenite reservoirs were studied.Based on the field data,the geological structure characteristics of glutenite reservoir are analyzed,and the reservoir numerical model is established to optimize the development parameters of horizontal well.Under the guidance of the actual parameters of the block multi-stage fractured horizontal well,the influence factors such as the number of fractures,the length of cracks,the pressure difference of production and the length of horizontal section are analyzed and the main influencing factors are screened.Considering the economic and technical aspects,the economic and technological boundary determination method was established.Using the breakeven principle and the dynamic economic evaluation method,the initial productivity of the single well is obtained.Meanwhile,using the potential theory and pressure drop superposition principle in oil and gas seepage theory,the actual initial production capacity of single well is obtained and the parameter limit of economic limit is established.In the reservoir condition of Yan 227,when the horizontal well is developed in the long well section,the production capacity is dropping faster and the development cost is difficult to recover.So it is necessary to study the feasibility of water-flooding development in glutenite reservoirs of Yanjia area In this paper,we analyzed the rationality of conventional water-flooding development,advanced water injection development,and proposed the effective development program.This paper studies the rationality of conventional water injection development,advanced water injection development,water development,and puts forward effective development plan.