Wireline coring problems and solutions in continental sedimentary formation drilling
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摘要: 近两年,在青海省大柴旦鱼卡煤田外围实施的多个1500 m深度的煤层气参数井,按地质设计均要求采用绳索取心钻进工艺进行施工。从施工情况看,普遍存在孔内事故多、工期长和成孔率低的问题。本文对JLSZK2钻孔在施工中出现的钻孔超径、孔壁间隙、岩心过度磨损等3个方面的问题进行了分析探讨,另外结合该矿区其他钻孔施工问题,总结出了如何运用绳索取心技术在陆相沉积岩地层进行高效、高质量施工的一些经验。Abstract: In the past two years, scores of CBM parameter wells with a depth of 1500m were drilled in the periphery of Yuka Coalfield, Dachaidan, Qinghai province, and wire line core drilling was conducted as per the geological design requirements. Drilling results showed that there were many down hole accidents with long drilling periods and low borehole completion rates. This paper analyzes the problems with drilling of JLSZK2 borehole, including diameter enlargement, hole wall clearance, excessive core wear; in addition, with regard to the problems with other borehole drilling in the mining area,experiences are summarized on how to perform wire line coring with high efficiency and high-quality in continental sedimentary formation.
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