深水钻井井筒水合物生成风险评估研究进展  

Research Progress on Risk Assessment of Hydrate Formation in Deepwater Drilling Wellbore

作　　者：徐鹏[1,2,3] 张雨 彭凯 王新影 任洁 XU Peng;ZHANG Yu;PENG Kai;WANG Xin-ying;REN Jie(College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Cooperative Innovation Center of Unconventional Oil and Gas,Wuhan 430100,China;Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan 430100,China;Nanpu Oilfield Operation Area,PetroChina Jidong Oilfield Company,Tangshan 063200,China)

机构地区：[1]长江大学石油工程学院,武汉430100 [2]非常规油气省部共建协同创新中心,武汉430100 [3]油气钻采工程湖北省重点实验室,武汉430100 [4]冀东油田南堡油田作业区,唐山063200

出　　处：《科学技术与工程》2022年第35期15436-15448,共13页Science Technology and Engineering

基　　金：国家自然科学基金(51804044)。

摘　　要：中外对于水合物在集输与采油过程中水合物生成堵塞研究较多,但深水钻井工况下水合物生成堵塞研究很少,水合物生成堵塞风险综合评估仍有待进一步研究。深水钻井过程中水合物易造成井筒堵塞,并诱发系列的井下事故风险,针对在深水钻井过程中在井筒低温高压条件下水合物在钻进、起下钻、压井等工况中的水合物生成堵塞风险评估开展理论与实验方面的调研。通过系统介绍天然气水合物的生成风险类型,水合物的生成风险评估环境分为钻遇含天然气地层井筒和在正常深水钻井井筒两种情况。当前深水钻井水合物生成风险预测模型:(1)基于V-P(Van der Waals-Platteeuw)模型推导;(2)基于络合溶解理论;(3)基于智能算法等。水合物生成风险实验评估主要包括基于光学检测、基于超声检测、基于电学检测、基于电子计算机断层扫描(computed tomography,CT),即技术、基于核磁共振成像技术等。水合物生成风险定量评估方法主要基于过冷度和无量纲施工参数。综合分析发现深水钻井过程中现有的水合物生成风险预测模型存在计算复杂,无法很好地深水钻井工况契合;而水合物生成风险实验评估都存在无法很好地模拟还原深水钻井循环,起下钻,关压井等复杂工况下生成堵塞风险。结合琼东南深水气田群开发钻完井关键技术研究子课题深水钻井多边界条件下水合物生成风险评估与处理方法研究项目对来深水钻井天然气水合物生成风险的研究重点进行了展望。The study of hydrate formation plugging has been more frequently studied in the gathering and recovery process at home and abroad,but the study of hydrate formation plugging under deepwater drilling conditions is rarely done,and the comprehensive assessment of hydrate formation plugging risk still needs to be further studied.During deepwater drilling,the wellbore is susceptible to blockage caused by hydrates and induces a series of downhole accident risks.The theoretical and experimental aspects of hydrate generation and plugging risk assessment during drilling,start-up and kill well of hydrates under low temperature and high pressure conditions in the wellbore during deepwater drilling were investigated.The types of gas hydrate generation risks were systematically introduced.The formation risk assessment environment of gas hydrate was divided into two situations:drilling in natural gas bearing formation wellbore and drilling in normal deepwater wellbore.Current hydrate generation risk prediction models were used for deepwater drilling:based on V-P model derivation,based on complex dissolution theory,based on intelligent algorithms,etc.Hydrate detection methods mainly include optical-based detection,ultrasound-based detection,electrical-based detection,CT-based techniques,and MRI-based techniques were used for experimental assessment of hydrate formation risk.Hydrate assessment methods based mainly on supercooling and dimensionless construction parameters were used for the quantitative hydrate formation risk assessment.A comprehensive analysis shows that the existing hydrate formation risk prediction model in deepwater drilling process is complicated in calculation and cannot be well fitted by deepwater drilling conditions;and the risk of blockage formation in deepwater drilling cycle,start-up,shut in well and kill well,and other complex conditions cannot be well reduced by hydrate formation risk experimental evaluation simulation.The research project on hydrate formation risk assessment and treatment methods und

关 键 词：深水钻井 生成堵塞 天然气水合物 井筒 评估 风险预测 

分 类 号：TE245[石油与天然气工程—油气井工程]