基于油气开发工程的深部煤炭地下气化关键技术

Key Deep Underground Coal Gasification Technology Based on Oil and Gas Development Projects

煤炭地下气化技术(UCG)作为一种潜在的煤炭清洁开采手段,由于技术及经济等因素制约尚未规模化应用,仍处于工程试验阶段,需要进行关键技术攻关。调研国内外相关技术发展历程和现状后发现:工程试验项目多以浅部煤层为主,技术相对成熟,而深部煤炭地下气化在环境保护方面更有优势,但是制约深部煤炭地下气化发展的气化炉构建和气化燃烧控制等关键技术还需进一步攻关试验。结合深部煤炭地下气化特点,利用油气开发工程上成熟的U型井精准对接技术、高温高压防腐技术、火驱油藏电点火技术、连续油管技术等,可针对性解决气化炉U型井连通、高温高压腐蚀、深部煤层原位点火、气化运行控制、气化炉燃烧监测等关键技术问题,推动深部煤炭地下气化技术进步,促进煤炭清洁开采产业发展。

The underground coal gasification(UCG)technology,as a potential way of clean coal mining,is still under engineering test and hasn’t been applied at a large scale due to restraints such as technology and economy.Key technological breakthrough should be made before the actual application.Based on the survey concerning the technology development history and the current situation at home and abroad,it is found that engineering test projects mainly involve shallow coal seam with relatively mature technology while deep underground coal gasification enjoys more advantages in environmental protection.However,the construction of gasifier and the control of gasification and other key technologies which hamper the development of deep coal underground gasification need to be further tested.In light of the features of UCG,such key technological issues as the connection of U-shape well,corrosion under high temperature and high pressure,in-situ ignition in deep coal,gasification operation control as well as gasifier combustion monitoring can be solved by way of the mature U-shape well accurate docking technology,anticorrosion technology under high temperature and high pressure,fire drive reservoir electric ignition technology,coiled tubing technology and other means.As such,it may advance the technology of deep coal gasification and promote the development of the clean coal mining industry.