Incorrect evaluation of equivalent circulating density (ECD) while drilling oil and gas wells may result in problems such as lost circulation, kicks, differential pipe sticking etc especially narrow margins. Due to the incompressible nature liquids, increase wellbore pressure will only have appreciable effect on fluid rheology at higher pressures, whereas a small temperature cause decrease rheo...

Nanoparticle drilling fluids have the potential to minimize wellbore instability problems. There is a need for development of new generation handle problems especially in lost circulation zones and shale A rheological model needed accurately describe rheology nano base fluid because limited experimental data are currently available using carbon particles water mud Inability current methods addr...

Drilling and completion fluids may cause significant formation damage in oil gas reservoirs, directly affecting productivity. For many years, operators have applied different stimulation practices such as acidizing, oxidizers, chelating agents, enzyme treatment to remove associated with drilling filter cake. An enzyme-based biological was combined other chemicals or additives a selective well c...

The aim of this study was to evaluate the chemical resistance and mechanical properties cement class G with n-SiO 2 addition after being exposed CO -saturated water at HPHT, simulating geological carbon storage condition. Four different amounts (0.5, 1, 1.5 3 wt%) a standard (STD Cement) were tested 150 bar 90 °C for 7 56 days. workability slurries evaluated by mini slump test helium gas pycnom...

The wetting characteristics of shale rocks at representative subsurface conditions remain an area active debate. A precise characterization wettability is essential for enhanced oil and gas recovery, containment security during CO2 geo-storage, flow back efficiency hydraulic fracturing. While several methods were utilized in the literature to evaluate (e.g., contact angle measurements, spontane...

Diamond is valuable material with extraordinary high thermal conductivity and transparency in a wide spectral range from UV to IR longer wavelengths. Defects impurities the diamond lattice can absorb emit light at wavelengths specific for each of such “color centers.” Particularly, vacancy-related defects diamond, as nitrogen-vacancy (NV) or silicon-vacancy (SiV) centers, are actively investiga...

Nanodiamonds containing negatively charged nitrogen-vacancy (NV$^-$) centers are versatile room-temperature quantum sensors in a growing field of research. Yet, knowledge regarding the NV-formation mechanism very small particles is still limited. This study focuses on formation smallest NV$^-$-containing diamonds, 5 nm detonation nanodiamonds (DNDs). As reliable method to quantify NV$^-$ nanodi...

Filtration index of the drilling fluid is an important parameter of well drilling, especially at drilling-in the reservoirs. Standard parameter in the study of drilling fluids is static filtration index. At the same time, it is more feasible to determine dynamic filtration index, if considering actual conditions of the well. Use of polymer carbonate-weighted drilling fluids is advisable at dril...