Wellbore stability is an important problem in the process of coal-rock gas well drilling.The geological structure of coal and gas wells in Fukang mining area,Xinjiang,is complex,the strata are under-compacted,the geology is loose,the upper mudstone strata and coal and rock collapse are serious,and the stability of the borehole wall is poor.In view of the above difficulties,the chemical film-forming plugging agent FDM-1 was introduced into the drilling fluid,and the wellbore stability was successfully solved in well FSL-43.It is proved by practice that,after the introduction of FDM-1,the wellbore is stable in the drilling process,the drilling and completion operations are smooth,the drilling cycle is 11.15 d,and the completion cycle is 16.54 d,the record of the shortest drilling and completion cycle without failure in this work area is refreshed.It provides an effective way for drilling stability control technology of coal-rock gas well.
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