双聚防塌冲洗液在覆盖层钻探中的应用

The Application of Dual-polymer Anti-collapse Drilling Fluid for Drilling in The Covering Layer

摘要:

在河南驻马店地区覆盖层钻探过程中，钻遇第四系粘土层、砂质泥岩、松散砂砾岩和泥岩不等厚互层，钻孔护壁难度大，容易发生掉块卡钻、塌孔埋钻等事故，取心困难。根据地质地层情况及区内钻孔施工资料，采用双聚防塌冲洗液。通过双聚防塌冲洗液的现场试验应用，在长孔段裸眼提钻取心钻进过程中，孔壁稳定性较好，未发生掉块、坍塌等现象，岩心采取率满足地质设计要求，减少了套管下入深度，节约了施工成本。

Abstract:

During the drilling process in the covering layer of Zhumadian area in Henan Province, drilling encountered the Quaternary clay layer, the sandy mudstone, the loose sandstone and mudstone interbedded with uneven thickness, difficult drilling wall protection, and prone to accidents such as block jamming, hole collapse and burial, taking core difficultly. Based on the geological and stratigraphic conditions and the drilling construction data within the area, the dual-polymer anti-collapse drilling fluid was used. Through the on-site application of the dual-polymer anti-collapse drilling fluid, the stability of the hole wall was good during the drilling process in the long open hole well section, without any incidents of falling or collapsing. The core monitor rate met the geological design requirements with reducing the depth of casing insertion and saving construction costs.