One of the principal factors in Shale instability is the stress variation due to water invasion into Shale in water-based drilling fluids, consequently causes in wellbore instability. This comprehensive study aims to improve the rheological properties and plug the nanometers Shale pore throat with biogenic silica oxide Nanoparticles. To do this, a new procedure of waste product from an agricultural industrial named Rice husks (RHs), amorphous silica oxide (SiO₂) Nanoparticles (NPs) with a purity of 97.7% synthesized. Amorphous biogenic silica Nanoparticles have unique properties that do not exist in their crystalline state due to extraction from natural materials. One of these properties is environmentally friendly than crystalline shape, which belongs to the first group of carcinogens for humans. The NPs characterization was performed by Field Emission Scanning Electron Microscope (FESEM), Energy-dispersive spectroscopy (EDS), X-Ray Fluorescence (XRF), Transmission electron microscopy (TEM). The utilization of synthesized NPs in the water-based drilling fluid at two concentrations of 3 and 5% w/v illustrated that the mud-based rheological properties such as viscosity and fluid loss were improved. Since then Pore Pressure Transmission (PPT) apparatus is applied to investigate the effect of the synthesized NPs to plug Shale pore throats. The PPT test results showed that 3% w/v of NPs block the pore throats of interlayer Shale of Asmari Formation and reduce the rate of fluid penetration in Shale is about 5.6%. Moreover, at the concentration of 5% w/v NPs, fluid invasion into Shale reduces up to 43.7% compared to base mud. Consequently, synthesized NPs from RHs could be used as an efficient method to improve the rheological properties of water-based muds and stabilize the Shale layer.

页岩失稳的主要因素之一是水基钻井液中水侵入页岩引起的应力变化，从而导致井眼失稳。这项全面的研究旨在改善流变性能，并用生物成因二氧化硅纳米颗粒堵塞纳米页岩孔喉。为此，采用了一种名为“稻壳（RHs）”，无定形氧化硅（SiO ₂）合成的纯度为97.7％的纳米颗粒（NPs）。非晶态生物二氧化硅纳米粒子具有独特的特性，由于从天然材料中提取，因此其结晶状态不存在。这些特性之一是对环境的友好，而不是晶体的形状，而晶体的形状属于人类的第一类致癌物。NPs的表征是通过场发射扫描电子显微镜（FESEM），能量色散谱（EDS），X射线荧光（XRF），透射电子显微镜（TEM）进行的。以3和5％w / v的两种浓度在水基钻井液中使用合成的NPs表明，基于泥浆的流变特性（如粘度和流体损失）得到了改善。从那时起，孔隙压力传输（PPT）装置就被用于研究合成的NP堵塞页岩孔喉的作用。PPT测试结果表明，3％w / v的NPs阻塞了Asmari组夹层页岩的孔喉，降低了页岩中流体渗透率，约为5.6％。此外，在5％w / v NPs的浓度下，与基础泥浆相比，渗入页岩的流体最多减少43.7％。因此，由RHs合成的NPs可以用作改善水基泥浆流变性和稳定页岩层的有效方法。与基础泥浆相比，渗入页岩的流体最多可减少43.7％。因此，由RHs合成的NPs可以用作改善水基泥浆流变性和稳定页岩层的有效方法。与基础泥浆相比，渗入页岩的流体最多可减少43.7％。因此，由RHs合成的NPs可以用作改善水基泥浆流变性和稳定页岩层的有效方法。