RMR在海洋天然气水合物钻探中的适应性分析
投稿时间:2019-11-04  修订日期:2019-12-28  点此下载全文
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作者单位E-mail
王 偲 中国地质调查局广州海洋地质调查局 wangcsy0922@163.com 
基金项目:自然资源部中国地质调查局项目“深海钻探技术与工程支撑(广州海洋地质调查局)”(编号:DD20190584)、自然资源部海底矿产资源重点实验室开放基金(编号:KLMMR-2017-A-06)联合资助。
中文摘要:深水表层天然气水合物沉积体埋藏浅、地层软、未固结,泥浆密度窗口窄,使用常规隔水管泥浆循环钻井钻遇水合物分解会引起井周孔隙压力及储层水合物饱和度发生变化,导致水合物储层泥浆密度窗口更窄,引发井壁以及井口失稳等问题,并且时间长、成本高。文章介绍了无隔水管钻井液回收技术(RMR)原理,对该技术在深水表层天然气水合物钻探中的适应性进行了分析。结果表明,RMR技术利用双梯度原理,能有效解决目前深水表层钻井窄密度窗口难题;实时监控系统提高遇险机动性,严防硫化氢等气体发生泄漏;能够简化井身结构,缩短建井周期,降低建井成本;同时对海洋零排放,安全环保。
中文关键词:RMR  双梯度钻井  天然气水合物  钻井风险  适应性分析
 
Adaptability of RMR for Marine Gas Hydrate Drilling
Abstract:Natural Gas hydrate(NGH) sedimentary bodies?is shallow、soft?and unconsolidated, the mud?window is narrow. It is time-consuming and expensive to drilling NGH with Conventional riser drilling. NGH?dissociation lead to the change of concentration and wellbore porepressure . Thereby the mud?window narrow down and the borehole be instability. Introduced the principle of Deep water riserless mud recovery drilling(RMR) and analyzed the adaptability in the drilling of NGH. The results indicate that RMR can solve the problem of narrow?density?window. The real-time?monitoring system improve the maneuverability and completelyeradicate the hydrothion leakage. It simplified?the wellbore configuration and decreased?the?cost?of the?well construction. There is no discharge into ocean, safety and environmental.
keywords:RMR  Dual gradient drilling  Natural Gas Hydrate  Risk of drilling  Adaptability
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