Experimental study of dynamic vs. static filtration rates in drilling muds

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6199079

Nasar, M S

Four clay-water base drilling muds treated with increasing concentrations of different water loss additives were used in this study. The water-loss additives are sodium carboxymethylcellulose (CMC), starch, sodium polyacrylate (Cypan), and oil. The first drilling mud is composed of 3.2% by volume sand and 2% clay; the second is composed only of 2% clay. These two muds were used to study the effect of cuttings such as sand or silt on both static and dynamic filtration rates and on the performance of water loss additives. The third and the fourth drilling muds, composed of clay and barite, have 12% and 27% solids contents, respectively. The results from measuring the API filtrate losses and dynamic filtration rates of all four muds were used to investigate the possibility of correlating API filtrate losses with stabilized dynamic filtration. Experimental results indicate that the presence of sand in the drilling mud decreases the API filtrate losses, while it increases the dynamic filtration rates. From the experimental results, different relationships were found between API filtrate losses and stabilized dynamic filtration rates depending on the mud or the additive used. Therefore, it was concluded that no general correlation exists between API filtrate losses and stabilized dynamic filtration rates.

• OSTI ID: 6199079
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ADDITIVES
DRILLING
DRILLING FLUIDS
FILTRATION
FLUIDS
LOSSES
SEPARATION PROCESSES
WELL DRILLING