改性纳米颗粒稳定的可逆乳化钻井液的制备与性能

Preparation and properties of the reversible invert emulsion drilling fluid stabilized by modified nanoparticles

可逆乳化钻井液可集中水基钻井液与油基钻井液的优势。现有可逆乳化钻井液所用乳化剂为表面活性剂,考虑用改性纳米颗粒制备可逆乳化钻井液提高其耐温性能和稳定性。本文优选可制备可逆乳状液的改性纳米颗粒,在此基础上制备可逆乳化钻井液,并进行性能评价。经研究,改性纳米颗粒3可制备可逆乳状液,在此基础上制备可逆乳化钻井液,与表面活性剂HRW稳定的可逆乳化钻井液(乳化剂用量1.4%)相比,所制备可逆乳化钻井液在乳化剂用量较少(0.8%)的情况下,保持良好的可逆转相性能、滤饼清除和含油钻屑处理性能,且在耐温性能(180℃)和稳定性(1000V<W/O乳状液破乳电压)方面明显优于表面活性剂HRW稳定的可逆乳化钻井液(耐温120℃,550V<W/O乳状液破乳电压<650V)。

Reversible invert emulsion drilling fluid combines the advantages of both the oil based drilling fluid and the water based drilling fluid.The reversible invert drilling fluid in the current study mainly used the surfactant reversible invert emulsifiers.Modified nanoparticles were used as reversible invert emulsifier to enhance the heat resistance and the stability of the reversible invert emulsion.Firstly,the nanoparticles which can be used to make reversible invert emulsion were chosen.Secondly,reversible invert drilling fluid was made based on the reversible invert emulsion.Thirdly,the properties of the reversible invert drilling fluid were evaluated.Based on the evaluation,the nanoparticles3was chosen as the reversible invert emulsion.The stability of the reversible invert emulsion drilling fluid was enhanced by the modified nanoparticles,compared with the reversible invert drilling fluid stabilized by surfactant(the usage of the emulsifier is1.4%).The reversible invert emulsion drilling fluid stabilized by the modified nanoparticles improved not only the performance in the aspect of reversible phase inversion,filter cake treating and oiliness cuttings treating,but also the performance of heat resistance.