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套管难起拔,是在复杂地层钻探施工中常遇到的问题.它影响钻探效率和钻探成本.本文介绍大宝山矿区复杂地层中套管起拔困难的一种解决方法,1977～1978年,在该矿区南、北两矿带计23个钻孔的实验和使用结果表明,套管起拔时间降低66～90%,台月数增长1.7～2.18,总台时提高319～501小时,套管报废数减少50～66%.为了说明问题,现分如下几个方面予以阐述.地层情况和起拔套管遇到的问题矿区上部为风化残留铁帽层,厚15～140余米,空洞裂隙十分发育.岩、矿体破碎,部份粉化至泥化,透水性强.层中夹有厚薄不一(2～40余米)粘士和页岩2～6层,遇水溶胀或泥化.下部为较完整的板岩、砂岩、石灰岩和玢岩.表层套管或第二层套管均下至这类岩层的顶部.施工中,孔壁严重漏失,大量涌砂,坍
Casing difficult to pull, is often encountered in complex formation drilling problems.It affects the drilling efficiency and drilling costs.This article describes the Dabaoshan mining complex casing in the lifting of a solution difficult, 1977 ~ 1978, The experiment and application results of 23 boreholes in the two ore mines of North and South show that the casing pull-out time is reduced by 66 ~ 90%, the monthly number of months is increased by 1.7 ~ 2.18, and the total station time is increased by 319 ~ 501 hours. Pipe scrap reduction of 50 to 66% .In order to illustrate the problem, is divided into the following aspects to be described.Stratum conditions and the case of pulling up the casing problems The upper part of the mining area is the weathered residual iron cap layer, 15 to 140 meters thick, hollow Cracks are well developed Rock, ore body broken, some of the chalking to mud, water permeability strong. Layer layers of different thickness (2 to 40 meters) sticks and shale 2 to 6 layers, water swelling or Muddy.The lower part is more complete slate, sandstone, limestone and rock.The surface casing or the second layer of casing are down to the top of this type of rock.In the construction, the hole wall serious loss, a large amount of sand, collapse