Study On The Adjustment Method Of Well Pattern In Sapufu Oil Layer In The Xing7 Western Block

Due to the low permeability of the Fuyu oil layer and the narrow river channel,the development of a well pattern network alone has poor economic benefits and needs to be developed in combination with other oil wells.The Sapu oil layer in Xing7 Western Block has entered the high water cut stage.The comprehensive moisture content of the block has reached 92.81%,and the output has been reduced year by year.And the Fuyu oil layer has only opened up a small area of the test area.Due to the low permeability of the Fuyu oil layer and the narrow river channel,the development of a well pattern network alone has poor economic benefits and needs to be developed in combination with other oil wells.Therefore,this paper applies numerical simulation method to carry out in-depth study on the optimization of the integrated well pattern and the combination of layered well pattern in the enhanced oil recovery of Class? oil layer,tertiary infilling of Class ? oil layers,and the development of the Fuyu oil layer,to determine the development adjustment potential of the block and the best combination of layer and well network.In this paper,seismic data and well point data are applied,and the joint well-seismic modeling method is used to establish the fine geological model of Fuyu oil layer.The accuracy of the model is verified by the history of the test area.The well point data is used to establish the geological model of the Sapu oil layer and the water flooding history is fitted.The distribution of remaining oil in Class?oil layer and Class ? oil layer was quantified from the plane and the longitudinal direction respectively.The potential of enhanced oil recovery was analyzed from the aspects of sand body development,recoverable reserves of remaining water and remaining geological reserves.The potential of Class ? oil layer tertiary infilling adjustment was analyzed from the ratio of launching ratio and the reservoir utilization.Through the reservoir engineering method,the well pattern and perforation horizon of the tertiary production well network,the three infill well network and the Fuyu oil layer water drive development well network are determined.The comparative analysis of the development results of different well pattern combinations shows that the distribution of the sand bodies in the Class ? oil layers is scattered and poorly developed.If the development of the Fuyu oil wells is used on the net,the sand bodies cannot be effectively drilled,and many oil wells are in the mainstream line,and the development effect is poor.So Class ? oil layers need to be deployed separately to develop a well pattern;The oil permeability of Class? oil layer is relatively high,and the sand body develops contiguously.It can be used for the tertiary oil recovery by using the Fuyu oil layer well.By comparing the economic benefits of each scheme,the best way to adjust the well network is as follows: Class ? oil layers are adjusted with 141 m well spacing;the Fuyu oil layer is developed by water flooding with 200 m well spacing,after the completion of the development,the net carries out a tertiary oil recovery of Class? oil layer.This scheme separately deploys a set of tertiary infilling well pattern,which can effectively avoid the mainstream line of the secondary well pattern,and has better development effect,the ultimate recovery rate of Class ? oil layers can reach 47.72%,the economic benefit is the highest,the net profit of 80 US dollars oil price is 698 million yuan,this program is the recommended program.