【摘要】：針對納米材料在鉆井液中團(tuán)聚的問題,通過分子設(shè)計,改進(jìn)納米材料的表面性能,以改性納米二氧化硅為核,通過接枝柔性聚合物,合成了一種納米封堵降濾失劑。通過引入強(qiáng)的吸附基團(tuán)和疏水基團(tuán),聚合物分子的親疏水、氫鍵等協(xié)同作用形成空間的網(wǎng)架結(jié)構(gòu),使合成的納米封堵降濾失劑能夠以納米級尺度分散在鉆井液中,其在鉆井液中納米級粒度的含量高達(dá)59.3%,其不僅具有優(yōu)異的降濾失性能,同時具有柔性可變形性,還能夠吸附在巖石表面,提高納米材料對微裂縫和小孔隙的封堵能力。以合成的納米降濾失劑為核心處理劑,并優(yōu)選出配套的納米潤滑劑、納米抑制劑,形成納米鉆井液體系。該體系的抗溫達(dá)150℃,API濾失量在2.4 m L以下、高溫高壓濾失量在9.8 m L以下、潤滑系數(shù)不大于0.04,滲透率恢復(fù)值不小于91%、目的層井段巖屑回收率≥90.5%。該體系在大港油田棗1510井的應(yīng)用中表現(xiàn)出良好的潤滑性和保護(hù)油氣層效果。
[Abstract]:Aiming at the problem of nano-materials agglomeration in drilling fluid, the surface properties of nano-materials were improved by molecular design. A kind of nano-plugging and filtration reducer was synthesized by grafting flexible polymer with modified nano-silica as core. By introducing strong adsorption and hydrophobic groups, hydrophobic polymer molecules, hydrogen bonds and other synergistic effects to form a space network structure, the synthesized nano-plugging filter reducer can be dispersed in the drilling fluid on a nanometer scale. The content of nanometer particle size in drilling fluid is as high as 59.3, which not only has excellent filtration reduction performance, but also has flexibility and deformability, and can be adsorbed on rock surface, which can improve the plugging ability of nano-material to micro-fracture and small pore. Nano-drilling fluid system was formed by using nanometer filtrate reducer as core agent and matching nanometer lubricant and nano inhibitor as core treatment agent. The temperature resistance of the system is 150 鈩，

本文編號：2296143