无机聚合物钻井液在冷43块的应用

Application of Inorganic Polymer Muds in Leng Region No. 43

辽河油田冷４３块因含大颗粒矽砾岩，地层成岩性差，胶结松散，过去采用聚合物不分散泥浆施工，馆陶组以上地层井径扩大严重，不规则，且易渗漏。采用触变性能好、剪切稀释性好、携屑能力强的无机聚合物钻井液，并与钻井工程相配合，优化井身结构设计，控制合理的排量（２９Ｌ／ｓ左右），保持较低环空返速（小于１ｍ／ｓ）以减少钻井液对井壁的冲刷作用，有效地防止了井径扩大、地层渗漏，提高了井身质量和固井质量。

With nondispersed polymer muds, serious borehole enlargement and irregularity occurred,and lost easily because of largegrainglutinite, poor diagenesis and consolidation.After the use of inorganic polymer muds with good thixotropy, shear thinning and carrying capacity combined with optimum borehole design, reasonable displacement (about 29L/s),lower annulus back flow rate(lin/s less)to reduce the wash effect of muds on borehole,borehole and cementing qualities were improved for effective prevention of boreh...