Applied Research On Complex Structure Well In Buried Hill Reservoir Of Liaohe Oil Field

General geological reserves buried hill reservoir of liaohe oilfield has amounted to hundreds of millions of tons,this kind of reservoir with a high degree of dense core,strong reservoir heterogeneity,the conventional vertical well drilling way the characteristics of the development effect is poorer.Complex well structure as a new development of drilling technology,including horizontal well and branch type,can effectively improve the oil field production,reduce the cost of development,has been widely used in the conventional manner all kinds of reservoir exploitation effect is poorer.To doing well in liaohe oilfield,the buried hill reservoir in this paper the xingu 7 block as the target block,complicated structures at home and abroad in the field application effect is analyzed on the basis of the well,first of all,the xingu 7 block reservoir and reservoir characteristics of research,and using numerical simulation and the analogy method,the complex structure of the Wells in the xingu 7 piece of applied research.Through research,found that after the xingu 7 block reservoir types is massive fractured reservoir,the reservoir heterogeneity degree,on the longitudinal,can be divided into three sets of oil and gas formation,is suitable for adopting a series of development,the specific development way is: the conventional vertical Wells water injection,horizontal well development,the main choice of horizontal well type and fishbone Wells.The completion method is used to use the casing completion method from the top of the buried hill to the upper part of the target level,and then use the open hole completion method in the target horizon.The whole scheme has a total of 35 horizontal Wells(14 branch Wells)and 4 straight Wells.In the upper section,there are 9 horizontal Wells(1 branch well),22 horizontal Wells(10 branch Wells)and 4 horizontal Wells(3 branch Wells)in the lower part.From early has completed the implementation of the deployment of test Wells,the effect of the exploration effect is good,production 5 to 6 times higher compared to vertical well drilling,production effect is obvious,is suitable for the application of liaohe oilfield buried hill oil reservoir development.