基于节点分析劈分法的多层油藏井间动态连通性分析

识别注采连通关系对油田开发方案制定及剩余油分布描述具有重要的基础作用，多层合采油藏注采量的准确劈分严重制约着井间连通性的精准识别。本文首先根据开井及储层改造等影响产量重要因素来确定劈分时间节点；再基于生产、射孔、封层、酸化压裂及产吸剖面等监测资料，采用“节点内线性内插，最后一个时间节点线性外推”的劈分法，进行注采量劈分；随后，基于阻容模型建立多层井间动态连通性模型，定量识别多层井间连通情况；最后根据实际生产资料建立判断系数，验证模型计算结果。应用该方法对实际油田的100余口井进行注采劈分，计算动态连通系数，通过示踪剂监测、判断系数进行验证。结果表明，动态连通系数与示踪剂监测结果吻合程度高，与判断系数拟合趋势好。该方法能有效提高多层油藏井间连通性识别精度，具有很好的实用价值，为同类油藏调整注采关系、制定剩余油挖潜方案提供了借鉴。

Analysis of dynamic inter-well connectivity in multi-layer reservoirs based on node analysis splitting method

The accurate splitting of injection and production in multi-layered reservoirs seriously limits the accurate identification of inter-well connectivity. In this paper, the splitting time nodes based on the critical factors affecting production such as well opening and reservoir modification was firstly determined; then, the splitting method of "linear interpolation within the nodes and linear extrapolation outside the nodes" was used to split the injection and production based on the monitoring data of production, perforation, sealer, acidification and fracturing, and production and suction profiles. Then, a dynamic connectivity model was established based on the resistance-capacitance model to identify the connectivity between multi-layer wells quantitatively; finally, judgment coefficients were established based on the actual production data to verify the model calculation results. The method was applied to more than 100 wells in the actual oilfield for injection and production splitting, and the dynamic connectivity coefficients were calculated and verified by tracer monitoring and judgment coefficients. The results show that the dynamic connectivity coefficient agrees with the tracer monitoring results and fits well with the judgment coefficient. The method can effectively improve the accuracy of inter-well connectivity identification in multi-layered reservoirs, which has good practical value and provides a reference for adjusting injection and production relationship and formulating residual oil development for similar reservoirs.