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深水油气井关井期间井筒含天然气水合物相变的气泡上升规律研究 预览 被引量:1

The Ascending Law of Gas Bubbles in a Wellbore Considering the Phase Change of Natural Gas Hydrates during Deepwater Well Shut-in
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摘要 深水油气井关井期间天然气水合物的生成会导致气泡迁移滞后,影响钻井安全作业周期,为此利用室内垂直圆筒模拟深水井筒环境,实验研究了甲烷气泡表面水合物膜生长特性,提出了考虑自然对流传热的水合物横向生长模型及水合物膜厚度预测方法;分析了水合物气泡变形率与莫顿数、拖曳力系数及雷诺数之间的相关性,据此建立了关井条件下井筒中含水合物相变的气泡上升速度综合预测模型,并对南海某井的安全作业周期进行了预测和分析.通过实验和模拟分析发现,建立的自然对流传热模型对水合物膜横向生长速率和厚度具有较高的预测精度;水合物气泡的变形率随莫顿数增大而减小,拖曳力系数随雷诺数增大先减小然后逐渐增大,并拟合得到了气泡变形率、拖曳力系数计算公式.研究表明,气泡表面水合物的生成显著降低了气泡的上升速度,延长了安全作业周期,但气体到达海底井口后水合物堵塞风险增加,现场应根据关井时间采取针对性的井控措施. During the shut-in of deepwater wells,the formation of natural gas hydrate will significantly delay the migration of bubbles and affect the safe operation cycle of drilling.The bubble ascending dynamics considering the phase change of hydrate was studied.In the study,an indoor vertical cylinder was used to simulate the deepwater wellbore and to investigate the growth characteristics of hydrate film on the surface of methane bubbles..A model was proposed which incorporated the hydrate lateral growth model and the hydrate film thickness prediction method considering natural convection heat transfer.The correlations between hydrate bubble deformation rate and Morton number,drag coefficient and Reynolds number were explored.A comprehensive prediction model of bubble ascending velocity in wellbore considering hydrate phase change under shut-in conditions was established based on the study,and the safe operation cycle of a well in the South China Sea was predicted and analyzed.The experimental and simulation results show that the newly established natural convection heat transfer model has higher prediction accuracy for the lateral growth rate and thickness of the hydrate film and that the deformation rate of hydrate bubble decreases with the Morton number.The drag coefficient decreases first and then increases gradually with the Reynolds number and the corresponding calculation formula was obtained through fitting.Studies suggest that the formation of hydrate on the surface of the bubbles can significantly reduce the ascending velocity of bubbles and prolong the safe operation cycle.However,the risk of hydrate blockage will increase as gas reaches the subsea wellhead,and pertinent well control measures should be taken according to the shut-in time.
作者 韦红术 杜庆杰 曹波波 王志远 孙宝江 刘争 WEI Hongshu;DU Qingjie;CAO Bobo;WANG Zhiyuan;SUN Baojiang;LIU Zheng(Shenzhen Branch of China National Offshore Oil Corporation Limited,Shenzhen,Guangdong,518067,China;School of Petroleum Engineering,China University of Petroleum(Huadong),Qingdao,Shandong,266580,China)
出处 《石油钻探技术》 CAS CSCD 北大核心 2019年第2期42-49,共8页 Petroleum Drilling Techniques
基金 国家自然科学基金优秀青年科学基金项目'油气井多相流动理论及应用'(51622405).
关键词 深水油气井 天然气水合物 相变 气泡 上升速度 安全作业周期 拖曳力系数 deepwater well gas hydrate phase transition gas bubble rising velocity safe operation cycle drag coefficient
作者简介 韦红术(1970—),男,广西都安人,1994年毕业于石油大学(华东)石油工程专业,2010年获长江大学石油与天然气工程专业硕士学位,高级工程师,主要从事海洋钻完井技术研究及相关管理工作。E-mail:weihsh@cnooc.com.cn。
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