Study On Well Pattern Optimization Of Fuyu Reservoir In Sanzhao Area

In the 21 st century,the exploration and development of unconventional oil and gas,including tight oil and gas,shale oil and gas,has entered an active stage.The tight oil in Daqing exploration area is mainly concentrated in Fuyu reservoir in Sanzhao area in northern Songliao Basin,which is the key area of exploration and development in recent years.Fuyu reservoir in Sanzhao area is a set of river-shallow lacustrine delta depositional system,which is mainly composed of delta plain and delta front subfacies.The sand body has the characteristics of small plane scale,vertical multi-layer superposition,unconcentration and great thickness variation.In addition,due to the large burial depth,poor reservoir physical property and low oil saturation,the development test showed some problems,such as poor adaptability of well pattern,low single well production and difficult effect of waterflooding development.In this paper,by studying the geological characteristics of Fuyu reservoir and starting from the reservoir structure,deposition,physical property,oil-water distribution,fracture and ground stress characteristics as well as the reservoir forming property characteristics of tight oil,sand body genetic classification method is introduced to classify the reservoir types.To deepen the study on ground stress characteristics and fracture characteristics to evaluate rock compressibility,carry out integrated research on geological modeling and numerical simulation in selected representative well areas according to the evaluation results of reservoir type and rock compressibility,evaluate and select suitable well patterns for different types of reservoirs,and guide the development and design.The results showed that genetic sand body ?,? effect on geological reserves has absolute control,degree of reserves control generally reached 80% ? 90%.Fu A block(mainly type ? genetic sand body)when using injection-production pressure differential 30 MPa,well row spacing of 360×180m reverse nine-point pattern,recovery degree is high,the water flooding displacement effect is good,good economic benefit;Fu B block(?,type II genetic sand body of high)using horizontal well development effect is the best,when the horizontal direction perpendicular to the maximum principal stress well spacing,horizontal well length is 1200?1500m,the horizontal spacing of 500 m,the horizontal row of 200 m,the staggered cloth,the development effect of the optimal;Fu C block(?,type II genetic sand body of low)using the vertical Wells at Reverse seven-point pattern the development of combined well pattern of horizontal well,horizontal well main layer,mining the main layer vertical Wells,high recovery degree,the economic and reasonable.