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含水合物相变的油气井多相流动模型及应用研究 被引量:1

Modeling and application of wellbore multiphase flow with gas hydrate phase transition
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摘要 深水钻井、测试过程中,井筒/管柱中易生成天然气水合物。该文研究了含水合物相变的井筒多相流动特征,建立了含水合物相变的井筒多相流动模型,提出了水合物生成区域的定量预测方法,研究了水合物生成与沉积特征,得到了水合物堵塞形成机制。水合物生成导致井筒环空内气体体积分数减小,使得气侵早期具有"隐蔽性";而水合物在井口附近分解会造成气体体积分数迅速增大,使得气侵后期具有"突发性",导致侵入气体处理难度大,井筒压力控制困难。应用该文建立的模型,可以定量预测深水气井测试作业中易发生水合物堵塞的高风险区。研究提出通过注入低浓度的抑制剂,延缓水合物堵塞的发生,可以有效克服传统防治方法过度使用抑制剂的不足。该文的工作可为水合物堵塞预测和防治工作提供参考。 Gas hydrates form easily in deepwater wellbore during drilling and well testing operations. In this work, the characteristics of wellbore multiphase flow with gas hydrate phase transition are studied. A set of mathematical model is developed accordingly. A method is established to quantitatively predict the hydrate formation region in wellbore. The characteristics of hydrate formation and deposition are studied and the formation mechanism of hydrate blockage is investigated. The gas volume fraction in the annulus decrease with the formation of hydrates, which adds a "hidden" nature for the gas kick in deepwater. Besides, the gas volume fraction increase with the dissociation of hydrates near the wellhead, which adds a "bursting" nature for the gas kick and make it difficult to handle the intrusive gas and to control the temperature in the wellbore. Based on the proposed model, the high blockage risk region in the wellbore can be predicted quantitatively. The low-concentration inhibitors can be injected to delay the occurrence of hydrate blockage, which can conquer the insufficiency of conventional strategies of preventing the damage of hydrates with massive hydrate inhibitors. This work can provide some references to the prediction and prevention of hydrate blockage in deepwater.
作者 王志远 张剑波 蒋宏伟 连志龙 王金堂 孙宝江 Wang Zhi-yuan1, Zhang Jian-bo1, Jiang Hong-wei2, Lian Zhi-long2, Wang Jin-tang1, Sun Bao-jiang1 (1. School of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, China; 2. Drilling Technology Research Institute, CNPC, Beijing, 102206, China)
出处 《水动力学研究与进展:A辑》 CSCD 北大核心 2017年第5期584-591,共8页 Journal of Hydrodynamics
基金 国家重点基础研究发展计划(973计划,2015CB251200) 国家优秀青年科学基金(51622405) 国家重点研发计划(2016YFC0303408) 山东省自然科学基金(ZR2016EEM30)
关键词 天然气水合物 相变 井筒多相流动 深水井控 深水气井测试 Gas hydrate phase transition wellbore multiphase flow deepwater well control deepwater gas well testing
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