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首页> 外文期刊>Journal of Petroleum Science & Engineering >Experimental study and numerical modeling of methane hydrate dissociation and gas invasion during drilling through hydrate bearing formations
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Experimental study and numerical modeling of methane hydrate dissociation and gas invasion during drilling through hydrate bearing formations

机译：水合物轴承结构钻井过程中甲烷水合物解离及气体侵蚀的实验研究与煤气侵袭

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摘要

Gas hydrate has been concerned as a potential shallow hazard during deepwater drilling. In this study, hydrate dissociation and gas flow into wellbore induced by circulation of high temperature drilling fluid when drilling through hydrate bearing formations have been investigated. A specially designed experimental setup based on sandpack model was used, which can simulate the process of methane hydrate dissociation and gas production in wellbore with circulation of drilling fluid. The experimental results show that the rates of hydrate dissociation and gas production are greatly influenced by the temperature of drilling fluid, hydrate saturation and pressure. A mathematical model was derived to simulate the process of hydrate dissociation and gas invasion into wellbore within a few hours when hydrate zones being penetrated during drilling. The effects of various parameters on gas invasion rate have been evaluated, including the inlet temperature and circulation rate of drilling fluid, the rate of penetration, the wellbore size, and the circulation condition with or without drilling risers. The results show that small to moderate gas invasion can occur when drilling through hydrate zones mainly depending on the inlet temperature of drilling fluid and hydrate saturation in near wellbore formation, which can be manageable when low-temperature drilling fluid is used and with a low circulation rate. Optimizing penetration rate, reducing wellbore size and drilling without risers are also beneficial to decreasing the gas invasion from hydrate zones into the wellbore.
机译：天然气水合物在深水钻井期间被关注作为潜在的浅危险。在本研究中，已经研究了通过高温钻井液循环通过水合物轴承结构钻探的高温钻井液循环引起的水合物解离和气流。使用了一种基于Sandpack模型的专门设计的实验设置，可以模拟钻井液中甲烷水合物解离和天然气生产的过程，钻井液循环。实验结果表明，水合物解离和天然气生产的速率受到钻井液温度，水合物饱和度和压力的影响。衍生数学模型，以在钻井期间穿透的水合物区域在几小时内模拟水合物离解和气体侵入的过程。各种参数对气体侵入率的影响已经评估，包括钻孔流体的入口温度和循环速率，渗透率，井筒尺寸和循环条件，有或没有钻孔提升管。结果表明，在钻井液钻孔区钻孔时，可以发生小于中等气体侵入，主要取决于钻井液的入口温度和井眼部接近井眼形成，当使用低温钻井液和低循环时可以是可管理的速度。优化渗透率，减少井筒尺寸和钻孔而没有提升者也有利于将水合物区从水合物进入井筒中的气体侵袭。

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