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某铜矿主竖井工程为国家六五计划的重点项目之一。其主竖井掘进与建井工程外包给日本某公司施工。该公司要求我方在1983年内向日方提交完整而准确的工程地质与水文地质勘察资料。根据设计部门要求，需在竖井开拓前，就地施工一个850米深的勘探钻孔。为了保证其资料的准确性，对所施工钻孔的弯曲度、口径和采取率等均作了非常严格的要求，钻孔弯曲最大偏离距不得超过15％；岩心采取率要大于80％；不允许用泥浆钻进，对孔身结构和水文观测等也都作了明确的规定，终孔口径不得小于φ91毫米。即按要求
The main shaft project of a copper mine is one of the key projects under the State’s Sixth Five-Year Plan. Its main shaft drilling and construction projects outsourced to a Japanese company construction. The company asked us to submit complete and accurate information on engineering geology and hydrogeology survey to Japan in 1983. According to the design department’s requirement, a drilling depth of 850 meters should be constructed on site before the shaft is opened up. In order to ensure the accuracy of its information, the construction of the curvature of the borehole, caliber and take rate and so made a very strict requirements, the maximum deviation of drilling bending shall not exceed 15%; core take rate is greater than 80%; not Allow drilling with mud, the body structure and hydrological observations are also made clear that the diameter of the final hole shall not be less than φ91 mm. That is required