多因素融合井漏类型分析及其堵漏方法选择

Multi-Factor Fusion Well Leakage Type Analysis and Its Plugging Method Selection

渤海油田油藏地质条件复杂,井漏频次高、漏失规模大、一次堵漏成功率低,严重影响油田开发进度、钻井安全和钻井成本。基于渤海油田近十年漏失井钻井数据、漏失情况、堵漏方法、堵漏成功率分析了渤海油田漏失井的漏失原因、漏失特征、堵漏措施及效果,提出了多因素融合的井漏类型分析方法。漏失层地质风险提示、岩性、井深、工况、工程参数、憋压提示、漏速波动、漏排比是井漏综合分析的特征参数,将渤海油田井漏划分为11类。一次堵漏成功率、施工工艺、作业成本是堵漏方法选择的依据,基于多因素融合的井漏分析推荐堵漏方法,测试结果表明一次堵漏成功率由60.91%提高至89.30%。该方法提高了漏失类型判断精度和堵漏方法选择的针对性,实现了井漏处理中缩短非生产时间、降低作业成本、提升作业安全的目的。

Bohai Oilfield has complex geological conditions, high frequency of lost circulation, large scale of lost circulation, and low success rate of one-time plugging, which seriously affects the progress of oilfield development, drilling safety and drilling cost. Based on the drilling data, leakage situation, plugging method, and success rate of lost wells in Bohai Oilfield in recent ten years, this paper analyzes the loss causes, loss characteristics, loss plugging measures and effects of loss Wells in Bohai oil field, and puts forward a multi-factor fusion method of loss type analysis. Geological risk indication, lithology, well depth, working condition, engineering parameters, pressure holding indication, leakage rate fluctuation and leakage discharge ratio are characteristic parameters for comprehensive analysis of well leakage, and the lost circulation in Bohai Oilfield is divided into 11 categories. The success rate of one-time leakage plugging, construction technology, operation cost, and operation time is the basis for the selection of leakage-plugging methods. The lost-loss analysis based on multi-factor integration recommends the leakage-plugging method. The test results show that the success rate of one-time leakage plugging has increased from 60.91% to 89.30%. The method improves the accuracy of judging the type of leakage and the pertinence of the method of plugging, and achieves the purpose of shortening the non-production time, reducing the operation cost and improving the operation safety.