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继2017年5月鄂尔多斯盆地韩城煤层气区首口全井使用绒囊钻井流体顺利完成韩3-X井?215 mm套管完井水平井后,7月7日,绒囊钻井液再次在相似井身结构的韩3-Y井成功使用。气区上部二叠系石千峰组、石盒子组漏失严重,与之连通的直井发生恶性漏失及坍塌卡钻,成井难度大。绒囊钻井流体是一种对破碎岩石进行内封堵黏结的新型钻井液,可强化岩石力学性能,有效扩宽并稳定上漏下塌地层安全密度窗口,保障全井防塌控漏快速成井。
Following the successful completion of the wellbore drilling fluid of the first well of the Hancheng CBM area in the Ordos Basin in May 2017 with the Han 3-X well of ~ 215 mm casing completion horizontal well, on July 7, the velvet bag drilling fluid was once again at Han 3-Y wells of similar well structure were successfully used. In the upper Permian Shiqianfeng Formation and Shihezi Formation in the upper part of the gas district, there was a serious loss of connectivity and the vertical wells in which there was a vicious loss and collapsible sticking resulted in great difficulty in well completion. The velvet bag drilling fluid is a new type of drilling fluid that is used to seal the broken rock by internal sealing, which can strengthen the mechanical properties of rock, effectively widen and stabilize the safe density window of the collapsed layer, and ensure the quick completion of the whole well.