海洋天然气水合物试采关键技术

Key Production Test Technologies for Offshore Natural Gas Hydrate

针对海洋天然气水合物开发技术与常规海洋油气开发技术的异同,分析了海洋天然气水合物储层特性和试采面临的挑战,介绍了天然气水合物试采关键技术,包括控压钻井技术、套管钻井技术、抑制性钻井液、钻井液冷却系统、低温低放热水泥浆体系、完井技术、开采方式优选和储层及环境监测技术等,指出了我国海洋天然气水合物试采应围绕水合物物理力学性质、安全成井、连续排采与防砂、开采方法适应性评价、试采过程储层参数和地层形变监测等技术难题开展研究,通过示范工程,形成海洋天然气水合物试采技术体系,为我国海洋天然气水合物的高效开发提供技术支撑。

Taking intothe differences in development technologies for offshore natural gas hydrate （NGH） and conventional offshore oil and gas, this paper discusses the characteristics of NGH reservoirs and the challenges in NGH production tests. Key technologies for NGH production tests were presented, including managed-pressure drilling （MPD）, cased drilling, inhibitive drilling fluid, drilling fluid cooling system, low-temperature and low-heat cement slurry system, completion technique, production method optimization, reservoir and environment monitoring, etc. It is proposed that research for offshore NGH production test in China should focus on physical and mechanical properties of hydrates, safe well con- struction, continuous production and sand control, adaptability evaluation of production method, and res- ervoir parameter and formation deformation monitoring during production test. Moreover, demonstrative projects should be adopted to create the offshore NGH production test technologies, so as to provide reliable support for development of offshore NGH effectively in China.