In order to improve the rheological properties of drilling fluids, water-based drilling fluids (NWBDF) were prepared using nano silica (SiO2) and nano cellulose(CNC). The effects of temperature and concentration of nanoparticles on their rheological properties were investigated using a rotational rheometer. The results showed that CNC drilling fluid with a concentration of 0.15 wt% reduced the degree of low viscosity drop of drilling fluid at high temperatures, had the most significant rock chip lifting ability, and was more conducive to the formation of an internal gel network when the drilling fluid was flowing. A rheological i model with viscosity as a function of normalized rate is proposed.
In order to meet the energy demand, the exploration and development of oil and gas resources gradually to the deep and marine development, in the extraction of oil and gas resources in the process of drilling fluids is an indispensable part of the development of drilling fluids put forward new requirements (Herzhaft et al.,2003; Xie et al.,2019). Drilling fluids exhibit complex rheological properties under different drilling conditions (Livescu, 2012; Majidi et al., 2010). Currently, several types of drilling fluids are being used, such as oil-based, polymer-based, and water-based. Water-based drilling fluids are environmentally friendly compared to the other two, and therefore should be further developed to achieve similar performance to oil-based drilling fluids while maintaining their low environmental hazard (Christiansen, 1991; Mao et al., 2015).
Bentonite (BT) suspensions are widely used as water-based drilling fluids (WDFs) in drilling operations, but they have poor rheological properties and poor filtration at low solids content. Ismail et al. (2016) found that some of the additives in WDFs suffer from unstable rheological performance problems under high temperature and high-pressure conditions. Therefore, there is a need to find substances that are physically small, thermally stable, and environmentally benign for drilling fluid modification. (Bayat et al., 2021)
