安塞油田致密砂岩油藏补孔压裂措施效果分析OA

PQ reservoir belongs to a ultra-low permeability reservoir,with rapid decline in reservoir devel-opment and high difficulty in stabilizing production.With the development of regional sand bodies and large thickness of oil layers,there exists the condition of vertical oil layer not being utilized.The sand body is de-veloped,the oil layer thickness is large,but oil layers in vertical direction is not used.In order to further tap the remaining oil potential and improve the development efficiency,well filling has become one of the main ways to stabilize production and tap potential in old oilfield areas.Based on the analysis of measures effect in different layers over the years,the lower limit of oil production in each layer is summarized.The influence of formation coefficient,porosity,original oil saturation and formation pressure on the filling effect is analyzed.It is suggested that the wells with good reservoir physical properties,formation coefficient of 4～10,porosity greater than 11%,oil saturation greater than 45%and formation pressure greater than 7 MPa should be selected for the next step,which provides a theoretical basis for the later perforation fractu-ring measures to achieve better results.