Optimization Of Design Parameters Of Horizontal Wells In Lucaogou Formation Of Permian In Jimsar

In recent years,through continuous exploration and development,the development mode of horizontal well and large-scale volume fracturing has been basically determined for the tight oil in Jimusar block of Xinjiang oilfield.Fully understanding the production characteristics and influencing factors of horizontal wells in this area and determining reasonable parameters of horizontal wells have guiding significance for the subsequent development of the oilfield.Combining reservoir engineering method with numerical simulation method,based on the dynamic analysis of actual horizontal well development in Lucaogou formation of Permian in Jimsar,this paper comprehensively studies the production performance characteristics and optimization design method of key parameters of fractured horizontal wells in tight reservoirs,and systematically carries out the following tasks:First,the productivity classification of horizontal wells is carried out,and the production decline law and oil-Seeking law are discussed.The production characteristics of horizontal wells are analyzed from the aspects of backflow characteristics,and the influencing factors of production characteristics are summarized from the aspects of geology,technology and horizontal well parameters.Then the block geological model is established,and the tight oil model is fitted by various key technologies to improve the accuracy of the model.Finally,the design parameters of horizontal wells are optimized by using the fitted model,including horizontal wells.The spacing,horizontal section length,main fracture spacing,half-length of main fracture and production system are selected to optimize a set of horizontal well parameters which are in line with the actual situation and have good development effect.Based on the development practice of compact oil horizontal wells in Jimsar block,the production rules and key influencing factors of different horizontal wells are determined through research.The reasonable design parameters of compact oil fracturing horizontal wells are optimized as follows:horizontal well spacing 300m,horizontal section length 1600m,main fracture spacing 40m,main fracture half-length130m and 30-40m~3/d production system,which is caused by Jimsar block.The subsequent deployment of tight horizontal wells and the rational development of such tight reservoirs provide technical support.