深层水平井双聚胺基钻井液技术研究与应用

针对大庆油田深层致密气埋藏深，储层砾岩、火山岩裂缝发育，水敏性强，钻井过程中易发生漏失、垮塌、缩径及高温钻井液性能变差等复杂，且深层水平井钻进会带来摩阻、携岩和储层污染及使用油基钻井液存在成本高、后期环保压力大等难题，在分析总结前人研究成果及经验基础上，从致密气藏地质特征及深层水平井钻井难点出发，明确了钻井液技术对策，通过开展聚胺和聚醚多元醇“双聚”抑制、封堵防塌剂的研究，配合自主研制的新型高效随钻封堵材料，研发出一套适合于深层致密气藏水平井施工的双聚胺基钻井液技术。室内研究及现场应用表明，该钻井液具有较强的封堵防塌、井眼清洁和润滑防卡能力，抗温达180 ℃以上，有效地解决了深层水平井漏失、垮塌、携屑、润滑问题和储层保护问题，保证了深层水平井的顺利施工，创造了大庆油田深层水平井钻井周期最短（109 d），井深最深（5048 m），水平段最长（969.22 m），井底温度最高(180 ℃)等几项新纪录，完全满足了徐家围子地区深层致密气藏的钻探需求，为深层水平井安全、快速、高效钻井提供了技术保障。

Research and Application of Double Poly Amine Drilling Fluid Technology in Deep Horizontal Well

According to the complex geological conditions of deep tight gas reservoir in Daqing oilfield, fracture developing in conglomerate and volcano rocks in the reservoir and strong water sensitivity; leakage, collapse, diameter shrinkage and drilling fluid property degradation while drilling at high temperature; friction, cuttings carrying and reservoir pollution in deep horizontal well drilling, as well as the high cost and late environmental protection pressure caused by the use of oil-based drilling fluid, on the basis of the analysis and summary of the previous experience, starting from the geological characteristics in tight gas reservoir and difficult points of deep horizontal well drilling, the technical measures for drilling fluid were clear. Though the study on inhibition of polyamine & polyether polyol and anti-sloughing plugging agent and working with new efficient independent developed drilling sealing material, a set of double poly amine drilling fluid technology was developed, which is suitable for horizontal well construction in deep tight gas reservoir. The laboratory studies and field application show that this drilling fluid system has ability of strong sealing