融合LightGBM和SHAP的井漏类型判断及主控因素分析  

Identifying Types and Analyzing Main Controlling Factors of Mud Losses Using a Method Integrating LightGBM Algorithm and SHAP

作　　者：陈林[1] 陆海瑛 王泽华[1] 李城里 杨恒 张茂欣 徐同台[2] CHEN Lin;LU Haiying;WANG Zehua;LI Chengli;YANG Heng;ZHANG Maoxin;XU Tongtai(Tarim Oilfield Company,PetroChina,Xinjiang 841000;Shi Da Huyang Petroleum Technology Development Co.,Ltd.,Beijing 102299;College of Petroleum Engineering,China University of Petroleum,Beijing 100100)

机构地区：[1]中国石油塔里木油田分公司,新疆库尔勒841000 [2]北京石大胡杨石油科技发展有限公司,北京102299 [3]中国石油大学(北京)石油工程学院,北京100100

出　　处：《钻井液与完井液》2023年第6期771-777,共7页Drilling Fluid & Completion Fluid

摘　　要：在塔里木盆地库车山前地区,盐膏层和目的层的地质条件复杂,钻井过程中面临许多挑战。这种复杂性导致井漏在钻井过程中频繁发生,带来巨大的经济损失。研究采用LightGBM算法建立了井漏判断模型,LightGBM模型判别性能较好,平均召回率为85%,精确率为91%,F1-Socre为86.7%。同时利用了基于SHAP值的可解释性机器学习技术分别针对单次井漏事件和所有井漏事件进行分析。SHAP值方法基于合作博弈理论,它将井漏事件的发生分解为不同特征的贡献值,以解释每个特征对于井漏事件的影响。研究发现,Δρ(钻井液密度与地层破裂压力当量钻井液密度的差值)、排量、井深和层位是导致井漏的主要影响因素。同时针对库车山前地区的盐膏层和目的层的地质情况,深入分析了层内地质影响和层间垂直分布影响。由此,现场工程师能够准确、快速地判断井漏类型,为防漏堵漏措施制定提供了有力支持。In the Kuche piedmont structure in the Tarim Basin where complex geological conditions prevail,frequent mud losses into the salt/gypsum formations and the target zones cause huge economic losses.To identity the types of the mud losses,a judgement model is established using the LightGBM algorithm.The LightGBM model,with good discriminative performance,has average recall rate of 85%,precision of 91%and F1-Score of 86.7%.In analyzing the types of mud losses,the interpretable machine learning techniques based on SHAP values are adopted to analyze a single mud loss event and all mud loss events as a whole.The SHAP value method,which is based on Cooperative Game Theory,breaks down the occurrence of mud loss events into contribution values of different features,and explains the effects of each feature on the mud loss event.Studies show that the main factors affecting mud losses include the difference between the mud density and the equivalent density calculated from the fracture pressure of the formation,the flow rate of mud,the well depth and the formation drilled.For the geology of the salt/gypsum formations and the target zones in the Kuche piedmont structure,the effects of the formation geology and the vertical distribution of the interlayer are in depth analyzed.This study enables the field engineers to fast and accurately determine the types of mud losses,and provides a strong support to the design of measures for preventing and controlling mud losses.

关 键 词：井漏 LightGBM 可解释性机器学习 主控因素 井漏类型 

分 类 号：TE258[石油与天然气工程—油气井工程]