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- Title
Velocity Profiles of the Biopolymer Drilling Fluids Based on Starch and Gum.
- Authors
Loginova, M. E.; Movsumzade, E. M.; Chetvertneva, I. A.; Shammazov, A. M.
- Abstract
The rheological and filtration properties of the biopolymer solutions based on natural polymers, gum and starch, that affect the removal of drilled cuttings to the day surface, the creation of hydrodynamic pressure, and the borehole cleaning, were considered. Hydrodynamic pressure, in turn, predetermines possible arising of complications during well construction such as absorption of the drilling fluid or influx of formation fluids, hydraulic fracturing of the rocks, and contamination of the productive formations which are opened mainly via horizontal wellbore drilling. The peculiar features of the use of a combination of gums and starch in biopolymer drilling fluids, manifested in changes in the values of the process parameters of the drilling fluids, as well as in the physicomechanical processes of solution circulation in the well, were studied. By means of mathematical modeling, the change in the annular velocity profile for the biopolymer solutions containing the studied reagents (gum and starch) separately and jointly was demonstrated. In this regard, the basic equation describing the motion of a pseudoplastic liquid (the Ostwald–de Waele model) was used for finding the velocity profiles in an annular gap of 10 mm for the biopolymer solutions, and the optimal velocity profiles were graphically determined for the aqueous solutions of the biopolymer reagents. Basing on analysis of the obtained velocity solutions and the experimental data on the filtration and transport properties of the biopolymer compositions, the optimal concentrations of the reagents were determined.
- Subjects
DEXTRINS; DRILLING muds; BIOPOLYMERS; DRILLING fluids; HYDRAULIC fracturing; EQUATIONS of motion; XANTHAN gum; RHEOLOGY
- Publication
Russian Journal of General Chemistry, 2023, Vol 93, Issue 3, p706
- ISSN
1070-3632
- Publication type
Article
- DOI
10.1134/S1070363223030258