Integrated Geological Engineering Design for Complex Lithology Low-Permeability Condensate Gas Reservoirs
The Xinjiang Oilfield saw retrograde condensation in the production of the complex lithology and low-per-meability condensate gas reservoir of the Jurassic San'gonghe Formation in the Qianshao 2 Well Area,and significant variability in oil test results between vertical and horizontal wells,which indicates the rational construction parame-ters for staged fracturing in horizontal wells need further optimization.In order to address these issues,a three-di-mensional geological and three-dimensional in-situ stress model of the target area was established through integrat-ed geological engineering research methods.Based on the actual reservoir characteristics and stress characteristics,the influence of fracturing scale on formation pressure and temperature is studied,and the presence of condensation during fracturing is also assessed through actual phase diagrams.In this way,the horizontal well fracturing plan was eventually improved.The study indicates that horizontal well fracturing has a positive effect on the development of this kind of condensate gas reservoir,for a large amount of fracturing fluid injection increases the formation pressure,offseting the influence of temperature field reduction on the condensate oil precipitation.The average permeability of the target layer is 1.86 mD,indicating good reservoir properties.Optimal fracturing results are obtained when the cluster spacing in horizontal wells is 25 m,and the sand addition per cluster is approximately 20.0～25.0 m3.This research provides important references for the rapid development and production building of condensate gas reser-voirs with similar geological characteristics.
complex lithologylow-permeability condensate gas reservoirfracturingtemperature fieldintegrated geological engineering
万方数据
维普
