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Salaheldin Elkatatny, Muhammad Shahzad Kamal, Fahd Alakbari, Mohamed Mahmoud
Optimizing the Rheological Properties of Water-based Drilling Fluid Using Clays and Nanoparticles for Drilling Horizontal and Multi-Lateral Wells
Appl. Rheol. 28:4 (2018) 43606 (8 pages)
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Drilling fluid constitutes an important part of the drilling operations. Gel strength property of drilling fluids plays a key role
in drilling multilateral and long horizontal reservoir sections. Losing the gel strength will accumulate drilled cuttings and as
a result, sticking of the drill string. Solving this issue takes a long time and increase the total cost of the drilling operations.
The objectives of this paper are to (1) determine the rheological properties of calcium carbonate water-based drilling fluid over
a wide range of temperature, (2) assess the effect of adding nanoclay, bentonite, and nanosilica on the gel strength problem
associated with the current field formulation of calcium carbonate water-based drilling fluids, and (3) optimize the concentration
of bentonite, nanosilica, and nanoclay in the drilling fluid. The concentration of bentonite, nanoclay, and nanosilica
was varied from 1 wt% to 10 wt%. Rheological properties results confirmed that the gel strength of the calcium carbonate
water-based drilling fluid reached zero lb/100ft2 by increasing the temperature to 200 °F (93.33 °C). This issue was solved by
adding different concentrations of bentonite, nanoclay, and nanosilica. At low bentonite concentrations (3.33 wt%), the gel
strength still reduced with time. At high bentonite concentrations (10 wt%), the gel strength increased with time. The optimum
concentration of bentonite was 6.66 wt%, which yielded a flat rheology profile of the gel strength. These results confirmed
that the rheological properties of the water-based drilling fluid were optimized by using bentonite. Similarly, 7.5 wt% nanosilica
showed the optimum performance. Nanoclay was not effective in improving the rheological properties of the calcium carbonate
drilling fluid.
► Cite this publication as follows:
Elkatatny S, Kamal MS, Alakbari F, Mahmoud M: Optimizing the Rheological Properties of Water-based Drilling Fluid Using Clays and Nanoparticles for Drilling Horizontal and Multi-Lateral Wells, Appl. Rheol. 28 (2018) 43606.
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