裂缝性特低渗油藏井间示踪剂监测等效抛物型解释模型

EQUIVALENT PARABOLIC-TYPE INTERPRETING MODEL OF THE INTERWELL TRACER MONITORING FOR FRACTURED LOW-PERMEABILITY OIL RESERVOIRS

为定量表征裂缝性特低渗油藏井间复杂的裂缝信息,通过分析该类油藏水驱开发特征,将井间复杂的裂缝系统等效为均匀分布的抛物型裂缝条带,通过裂缝条带的流管束等效,建立了裂缝性特低渗透油藏示踪剂监测等效抛物型解释模型,并分析了模型中主要参数的敏感性及不同裂缝参数组合模式下的示踪剂响应曲线特征;以定波及有效裂缝体积和示踪剂曲线形态模式为约束条件,利用遗传算法建立了模型示踪剂曲线自动拟合方法,并通过矿场应用实例验证了模型的合理性和准确性。研究成果可为裂缝性特低渗透油藏水窜水淹井逐级调控实时监测、方案优化调整及效果评价提供重要依据。

In order to quantitatively characterize the complex interwell fracture informations of the fractured lowpermeability oil reservoirs,with the help of the analyses of the reservoir development characteristics,the fracture system stated above is equivalent to the uniformly distributed fracture belts; and moreover by means of the flow tube equivalence of the belts,the equivalent parabolic-type interpreting model was established for the tracer monitoring of the kind of the fractured low-permeability reservoirs. And furthermore the key parameters ' sensitivities in the model and tracer response curve characteristics of different-fracture-parameter combined modes were analyzed; taking the static wave,effective fracture volume and morphologic models of the tracer curves as the constraining condi-tions,with the help of the genetic algorithm,the automatic fitting method of the curves was developed. The reasonability and veracity of the model were verified by the history case of the filed application. The study achievements can provide the important evidences for the real-time monitoring of step-by-step profile control,scheme optimization adjustment and effects evaluation for the water-crossed and watered-out wells of the fractured low-permeability oil reservoirs.