期刊
ENERGIES
卷 14, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/en14061644
关键词
granular-wet rheology; particles transport; drilling fluids; cuttings bed erosion; hole-cleaning efficiency
资金
- The Research Council of Norway [294688]
- Equinor, Stavanger, Norway
- OMV, Vienna, Austria
The study investigated the efficiency of cuttings transport in different drilling fluids, revealing systematic differences in internal friction behaviors between beds wetted with oil-based and water-based fluids. These findings may help explain the variations in previous studies on cutting transport.
The cuttings transport efficiency of various drilling fluids has been studied in several approaches. This is an important aspect, since hole cleaning is often a bottleneck in well construction. The studies so far have targeted the drilling fluid cuttings' transport capability through experiments, simulations or field data. Observed differences in the efficiency due to changes in the drilling fluid properties and compositions have been reported but not always fully understood. In this study, the cuttings bed, wetted with a single drilling fluid, was evaluated. The experiments were performed with parallel plates in an Anton Paar Physica 301 rheometer. The results showed systematic differences in the internal friction behaviors between tests of beds with oil-based and beds with water-based fluids. The observations indicated that cutting beds wetted with a polymeric water-based fluid released clusters of particles when external forces overcame the bonding forces and the beds started to break up. Similarly, it was observed that an oil-based fluid wetted bed allowed particles to break free as single particles. These findings may explain the observed differences in previous cutting transport studies.
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