煤层气开发新技术试验研究与探索

Experimental study on a new development technology of coal bed gas

针对我国煤气层超低渗透性、低压、低含水饱和度地质特征及煤层气吸附性较强的开发难点,提出把高能气体压裂用于煤层气开发的新技术试验研究与探索.研究思路是以高温高压气体促使煤气层产生和形成较长的多裂缝体系,并伴随较强的脉冲震荡、热作用于地层基质,提高煤气层空隙间的连通性和渗透性,改善解吸环境,促进煤层气解吸和泄气,以提高煤层气井产量.重点论述了此项研究的研究思路、作用机理、工艺设计、可行性等.介绍了现场试验情况,并指出了煤层气开发新技术研究与探索的方向.

According to the geologic characteristics of the low permeability,low pressure and low water saturation of the coal bed in China and the stronger adsorption of coal bed methane,it is proposed that high-energy gas fracturing technology is applied in the development of coal bed methane.The mechanism of the technology is that high-temperature high-pressure gas can produce multi-fracture system in coal bed,and it can also produce stronger impulse oscillometry and thermal effect in the coal bed so to improve the pore connectivity and permeability of the coal bed,which can improve the adsorption environment of the coal-bed gas so to promote the desorption of the coal-bed gas and increase the yield of the coal-bed gas wells.The research approach,effect mechanism,technologic design and feasibility of the technology are discussed,and the field test of it is also introduced.The future research direction of the coal-bed gas development technologies is presented.