Fusion application of capillary pressure theory and geological modeling in directional well deployment:a case study of hanging wall reservoir of Yingdong Oilfield,Qaidam Basin
The hanging wall reservoir of Yingdong Oilfield is a typical long well section multi-layer monocline fault-nose reservoir in Qaidam Basin.Aiming at reservoir development contradiction,and based on sedimentary and structural reservoir control,this paper combines the traditional calculation of simple oil-water transition zone with the single-dimension fluid distribution characterization method predictied by the reservoir geological model,proposing a directional well trajectoy deployment method combining capillary pressure theory with geological modeling,and effectively avoids the drilling risk caused by a single factor in the process of well location deployment.Since the laboratory capillary pressure measurement environment is different from that of the actual formation,the laboratory capillary pressure should be converted into the corresponding reservoir capillary pressure before calculating the oil column height,so that the calculated results are closer to the real reservoir information.At the same time,the oil column height model based on the average J function curve makes up for the shortcomings of incomplete characterization of single rock samples to a certain extent,but for multi-layer and highly heterogeneous reservoirs,multi-point and multi-section analyses and calculations are necessary.Moreover,to further improve the accuracy of oil and gas characterization,the model parameters must be modified according to the sedimentary and structural characteristics and well logging data of the working area.The research results show that the capillary pressure curve can be used to quantitatively evaluate the development scale of multi-layer sandstone reservoir and can provide a reference for the deployment design of well location trajectory based on the establishment of high-precision three-dimentional model.The application of this method is conducive to the adjustment of the late development mode and the utilization of benefits of the toothbrush-shaped reservoir.
directional welllong well sectiontoothbrush-shaped reservoircapillary pressuregeological modelingYingdong Oilfield
NETL
NSTL
万方数据
