湘中煤层气开发可行性与施钻风险分析

Coal-bed Gas Development Feasibility & Drilling Risk Analysis in Central Hunan

根据煤层气的危害特性和赋存现状,开展基于已开采矿区的煤层气开发可行性分析和垂直钻井风险评估。以湖南湘中地区煤层气统计资料和地质结构特征为研究基础,先从地层、构造、煤储层物性以及含气量几个方面对该区煤层气开发潜力作出综合分析评价。然后从工程安全方面阐明钻探风险,提出有利于煤层保护、有效钻进减少事故的安全技术措施。最后提出煤层气的赋存特性决定钻采开发模式,必须紧紧围绕"安全高效"来制定钻采开发方案,把风险降到最小。

According to coal bed methane properties and occurrence hazards, this paper carried out a feasibility analysis of CBM development and vertical drilling risk assessment. First, On the basis of the statistics data and geological structural features, the paper made a comprehensive study of the coal-bed gas in central area of Hunan in the aspects of formation, structure, coal reservoir properties and gas content. Then, drilling risks were raised from engineering safety perspective, and safety technology measures to reduce drilling safety accidents and to protect coal bed were put forward. At last, a conclusion is proposed that coal-bed gas methane properties decide the development pattern, and so the development scheme must revolve around ＂safety and high-efficiency＂ so as to minimize the risks.