海上低渗气田综合多因素压裂选井选层方法

Fractured well and layer selection by multi-factor optimization for low permeability offshore gas field

彭成勇¹ 吕欣润² 马新仿² 蔡久杰² 王伟²

中海油研究总院钻采研究院，北京100027 中国石油大学（北京）石油工程教育部重点实验室，北京 102249

Research Institute of Drilling and Production, CNOOC Research Institute, Beijing 100027, China MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

自2008年以来，对×海上低渗气田多口井进行了水力压裂施工，但效果参差不齐，与压前预计误差较大。有多口井压后因沟通水层而导致出水严重，迫切需要科学有效的压裂选井选层方法，以便对后续施工进行指导。在对该海上气田各项参数分析总结的基础上，考虑了压后产能及沟通水层的风险，提出了支持向量机算法与缝高预测模型相结合的综合多因素压裂选井选层方法，编制了支持向量机程序和风险图版，并对该气田的7口压裂探井进行试验。产量预测结果与实际数据的绝对误差小于1.4×10⁴ m³/d，达到了较高的预测精度。

Many wells have been fractured hydraulically since 2008 in an offshore gas field, but the results are not the same and further beyond the expectation; great water production happened in many wells, so it is urgent to establish a method to choose the optimal formations or wells for hydraulic fracturing. On the basis of the parameter analysis of this field and considering the yield and risk after fracturing, we use Support Vector Machine and fracture extension model to establish a multi-factor method to optimize well and layer fracturing. A Support Vector Machine program and risk plates are prepared. Then this method is applied to 7 exploration wells in this field, the average error of those results less than 1.4×10⁴ m³/d means that this method can meet the demand of the field.

10.6056/dkyqt201504023