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煤层气是储集于煤层孔隙中的天然气。煤层与一般的油气层相比，埋藏浅，微孔隙和裂缝发育。煤层的机械强度和孔隙度低，易坍塌、易污染。文中根据煤层气井的特点，介绍了一般油气井固井与煤层气井固井的区别，总结了国内目前煤层气井固井技术现状及存在的问题，提出了几个在以后煤层气井固井中应研究解决的问题。
CBM is the natural gas trapped in the pores of the coal seam. Compared with the general oil and gas bed, the coal seam is shallow buried, micropores and cracks develop. The mechanical strength and porosity of coal seam is low, easy to collapse, easy to pollute. According to the characteristics of CBM wells, this paper introduces the differences between cementing of general oil and gas wells and cementing of CBM wells, summarizes the current status and existing problems of cementing technology of CBM wells in China, and proposes several solutions to future CBM well cementing problems The problem.