全球首次海洋天然气水合物固态流化试采工程参数优化设计

发布时间：2018-04-21 03:10

本文选题：海洋 + 天然气水合物　；参考：《天然气工业》2017年09期

【摘要】：我国南海的天然气水合物(以下简称水合物)90%以上都属于非成岩矿体,常规方法难以开采。周守为院士创新性提出了高效开发该类水合物矿体的革命性技术之一——固态流化法,并在中国南海神狐海域依托国内自主知识产权的技术、装备和工艺等,成功试采了该类水合物。在流化试采过程中,井底射流破碎水合物矿体至细小颗粒并随钻井液向上返出,含水合物固相颗粒在温度升高、压力降低至受施工参数影响的、区别于常规静态相平衡曲线的动态相平衡状态时发生分解,使得环空液固流动变为复杂气液固多相流动,井控安全要求极高,需要对施工参数优化设计。为此,基于目标区块工程地质特征并结合复杂井筒多相流动分析,对该工程参数进行优化设计,建立了复杂介质井筒多相流动、温度、压力以及水合物相平衡、分解理论模型和数值计算方法,通过数值仿真、软件仿真以及实验验证,对不同施工参数下的流化试采井筒多相流动进行了分析,形成了海洋天然气水合物流化试采现场工程参数优化设计方法及方案:井底射流流化井段直径不宜过大,应适当提高钻井液排量、密度、施加井口回压,以保证安全携岩和降低井控风险。该基础理论研究成果为现场施工以及试采产能的提升提供了重要技术保障。
[Abstract]:More than 90% of the natural gas hydrate in the South China Sea belongs to non-diagenetic orebody, which is difficult to be exploited by conventional methods. Academician Zhou Shouwei has innovatively proposed one of the revolutionary technologies for the efficient development of this kind of hydrate orebody, the solid-state fluidization method, and relying on the technology, equipment and technology of domestic independent intellectual property in the Shenhu Sea of the South China Sea. This kind of hydrate was successfully extracted. During fluidized production test, the bottom hole jet breaks down the hydrate ore body to fine particles and goes back up with the drilling fluid. The solid particles containing hydrate increase in temperature and the pressure decreases to be affected by the construction parameters. Different from the conventional static phase equilibrium curve, the dynamic phase equilibrium state is decomposed, which makes the liquid-solid flow in annulus become a complex gas-liquid-solid multiphase flow. The safety requirements of well control are very high, and the optimal design of construction parameters is needed. Therefore, based on the engineering geological characteristics of the target block and the analysis of multiphase flow in complex wellbore, the engineering parameters are optimized and the multiphase flow, temperature, pressure and hydrate phase equilibrium of complex medium wellbore are established. Through numerical simulation, software simulation and experimental verification, the multi-phase flow in fluidized production test wellbore under different construction parameters is analyzed. The optimization design method and scheme of engineering parameters in the field of fluidization production of marine natural gas hydrate are formed: the diameter of fluidized well section should not be too large at bottom hole, the drilling fluid discharge and density should be properly increased, and the wellhead return pressure should be applied. To ensure the safe carrying of rock and reduce well control risk. The research results of this basic theory provide important technical support for site construction and productivity enhancement of test production.
【作者单位】： "西南石油大学油气藏地质及开发工程"国家重点实验室;西南石油大学"油气藏地质及开发工程"国家重点实验室;中海油研究总院;中国海洋石油总公司;
【基金】：国家重点研发计划“海洋水合物固态流化测试新技术”(编号:2016YFC0304008) 国家自然科学基金重点项目“控压钻井测控理论及关键问题研究”(编号:51334003)
【分类号】：TE53

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