DSW-S纳米颗粒对油基钻井液的稳定作用

Effect of DSW-S Nanoparticle on the Stability of Oil-Based Drilling Fluid

为获得高性能油基钻井液,采用疏水改性二氧化硅类纳米颗粒材料DSW-S提高油基钻井液的稳定性,研究了DSW-S的微观形态与疏水性,考察了DSW-S加量对油基钻井液流变性和电稳定性的影响,分析了纳米材料稳定钻井液的作用机理。结果表明:疏水的DSW-S纳米颗粒有助于稳定W/O乳液,可使油基钻井液黏度和切力增加。3%DSW-S即可使油基钻井液的破乳电压从318 V增至535 V,使钻井液的乳化稳定性大幅提高,有助于油基钻井液在页岩地层的安全快速钻进。

In order to obtain oil-based drilling fluid with high performance, the emulsion stability of oil-based drilling fluid was improved by using hydrophobically-modified silicon dioxide nanoparticle DSW-S. The microscopic morphology and hydrophobic of DSW-S were examined, the effect of DSW-S dosage on rheological property and electric stability of oil-based drilling fluid was studied, and the stability mechanism of drilling fluid by nanomaterial was analyzed. The results showed that hydrophobic nanopartiele helped to stabilize the W/O emulsion. At the same time, nanomaterial helped to increase the viscosity and shearing force of oil-based drilling fluid. The addition of 3% DSW-S could make the demulsification voltage of oil-based drilling fluid increase from 318 V to 535 V. The emulsion stability of oil-based drilling fluid improved substantially, which contributed to fast and safe drilling in shale formation.