对依兰煤田钻孔缩径挤夹钻具事故的认识

Analysis on Borehole Diameter Shortening and Drilfing Tool Jamming Accident in Yilan Coalfield

摘要:

针对依兰煤田钻探施工中出现的钻孔缩径挤夹钻具事故,提出产生事故的根本原因不是因岩层本身膨胀所致,而是由于某种岩层裂隙发育,渗透性良好,吸水性强,使钻孔孔壁泥皮迅速增厚所致,并提出预防事故的具体措施。

Abstract:

According to the borehole diameter shortening and drilling tool jamming accident in Yilan, the basic reason was thought to be rapidly - thickening mud cake on the wall of borehole in crack development in some rock stratum with high permeability and absorbency, but not to be rock expanding. Concrete measures for the accident prevention were put forward.