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我院206机组在冶勒坝区X_9号孔松散卵砾石层中,采用φ56.mm金刚石双管,钻深达420.29m。在全国水电系统中,创造了卵砾石层单孔钻深的最高记录,在“深厚砂卵石层金刚石钻进与取样技术”的推广与完善方面又跨进了一步。该孔各项指标达到了优质水平,对阐明坝区深部地层结构和论证坝基渗漏起到了重要作用。该孔原设计深度280m,已于1988年底完工,并置放了184m的护壁套管,终孔直径φ75mm。由于水文地质观测工作的需要使用了清水洗孔,造成套管以下全部孔段的垮塌。为将该孔从184m加深至400～420m,以进一步满足初设阶段坝区工程地质勘探工作的需要,采用
206 units in our hospital are in the hole of spongy gravel of No. X9 in Li Le district, which is made of φ56.mm diamond double tube with drilling depth of 420.29m. In the national hydropower system, the highest record of single-hole drilling depth of gravel layer was created and took another step forward in the promotion and improvement of “deep sand and gravel diamond drilling and sampling technology”. The index of the hole has reached a high level of quality, and it has played an important role in clarifying the deep stratigraphic structure in the dam area and demonstrating dam foundation seepage. The hole was originally designed to a depth of 280m and was completed by the end of 1988 and placed a 184m sheath bushing with a final hole diameter of φ75mm. Because of the need for hydrogeological observations, clean water holes were used, resulting in the collapse of all the holes below the casing. In order to deepen the hole from 184m to 400 ~ 420m, in order to further meet the initial stage of dam geological engineering exploration work needs, the use of