有机/无机复合纳米水基钻井液体系研究

Study of Organic/Inorganic Composite Nano-Sized Water-Based Drilling Fluids

利用有机和无机纳米粒子作为功能处理剂(架桥、封堵),结合常规聚合物处理剂组成了有机/无机复合纳米水基钻井液体系,评价了该钻井液体系的隔离层效应、抗温性、抑制性、抗污染能力和沉降稳定性。评价结果表明:有机/无机复合纳米水基钻井液体系具有较强的隔离层效应,120 min后动滤失量几乎为零;抗温达到180℃;具有较强的抑制泥页岩水化膨胀的能力,页岩在纳米水基钻井液中的线膨胀率仅为17.92%,滚动回收率为95.00%;抗盐和钻屑污染能力强,抗NaCl和CaCl2可达15%和7%,抗钻屑污染可达15%;沉降稳定性好,能满足现场施工要求。

Using organic nano-latex and inorganic particles as bridging and block agents along with the polymer additives,the organic/inorganic composite nanometer water-based mud system was developed.The isolation layer efficiency,temperature resistance,inhibitive ability,pollution resistance and sedimentation stability were evaluated.The investigation indicates that this mud system has higher isolation layer efficiency with zero filtration loss after 120 min.It is effective up to 180 ℃.The system has strong shale inhibitive ability with swell rate of 17.92% and the recovery rate of 95%.It has strong salt and bit cuttings resistance up to 15%NaCl,7% CaCl2 and 15% bit cuttings.At last,the sedimentation stability of the system is good and meets requirements of in-situ drilling operations.