Bentonite-free water-based drilling fluids at HP/HT condition: a rheometric analysis

Visualizing flow dynamics and restart of Carbopol gel solutions in tube and parallel-plates geometries with wall slip

“…where u s is the wall slip velocity in r = AER. The velocity of slip was determined by extending the non-linear fit described by eqn (9). We utilized the conventional Levenberg-Marquardt non-linear fitting method, which is implemented in Matlab.…”

“…The flow of yield stress fluids such as physical gels, 1,2 biological materials, 3 emulsions, 4,5 colloids, 5–7 foams, 8 drilling fluids 9,10 and waxy oils, 11,12 is ubiquitous in nature and industry. These materials generally exhibit a solid–liquid transition, meaning that they begin to flow once a critical stress ( i.e.…”

Enhancing drilling mud performance through CMITS-modified formulations: rheological insights and performance optimization

“…In recent years, non-damaging bentonite-free water-based muds have been used widely due to their better performance. 8 The main additives for regulating rheological and filtration properties of non-damaging muds are comprised primarily of acid-soluble resources, such as biopolymers, cellulose, inhibitors, and calcium carbonate. Such polymeric materials are proven to enhance viscosity and gel strength even at low concentrations.…”

A Novel Amphoteric Ion-Modified, Styrene-Based Nano-Microsphere and Its Application in Drilling Fluid

“…With the continuous development of petroleum resources, shallow resources are gradually depleted, and deep ultra-deep oil and gas has become a key development object [ 4 , 5 , 6 , 7 ]. However, deep formations generally face complex challenges such as high-temperature and high-salinity, which requires higher drilling technology [ 8 , 9 , 10 , 11 ].…”