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一、钻孔不完整性的影响在抽水试验过程中,水位下降真实状况被歪曲的因素之一,是在含水层打开的程度和特性方面钻孔不完整。在研究深部地下工业用水时,这种不完整性的影响是很明显的。事实上,在苏联大部份水文地质区域地下工业水,产于陆源的不同程度固结的厚地层内,而很少产于有孔隙、有裂隙和喀斯特化岩石的地层中。工业用含水层埋藏深度很大,妨碍过滤器的安装,这种过滤器主要是用于较浅钻孔中的地下淡水。因此深孔的试验通常在套管和套管外的水泥环保护下进行。为了预防在岩层压力作用下套管柱变形、压缩和断裂,当深
First, the impact of drilling incompleteness During the pumping test, one of the factors that caused the water level to decline is the fact that the drill hole is incomplete in terms of the extent and characteristics of the opening of the aquifer. The impact of this incompleteness is evident when studying deep underground industrial water use. In fact, underground industrial water in most hydrogeological regions of the Soviet Union is produced in terrestrial, differently consolidated, thick formations and rarely in formations with pores, fissures, and karstic rocks. Industrial aquifers are buried deep enough to hinder the installation of filters, which are mainly used for underground freshwater in shallow boreholes. Therefore, the deep hole test is usually carried out under the protection of the cement ring outside the casing and casing. To prevent deformation, compression, and fracture of the casing string under formation pressure, when deep