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The readings can be easily translated into mud plastic viscosity, mud yield point, and mud apparent viscosity.
Prepared drilling fluid samples (with core shell nanocomposite, nanoCMC and bulk CMC as additives) were used to measure and compare fluid loss, mud cake thickness, viscosity, mud weight and pH.
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Another aspect of this work was influenced by the need to understand the flow dynamics around bends (horizontal to inclined and inclined to vertical sections) during deviated drilling operations using two high viscosity muds (0.5% CMC and 0.5% CMC + 4% Bentonite mud).
Indeed, the viscosity of mud was doubled (12.5 25 of CP) (see Fig. 1).
This fact also supports previous discussion about viscosity of mud in which increasing the viscosity can improve CTP if the flow regimes is still turbulent.
The testing experiment in the field goes on uninterruptedly for almost one week; the target experimental mine is 3.5 km deep; the viscosity of mud is 10 m Pa·s; the experiment starts its directional measurement from 2 km.
This reveals that viscosity of GLG mud is thermally reversible, and GLG mud demonstrates good stability under high temperature.
Compared with CMC, GLG is more effective in boosting mud viscosity (see the green curve in Fig. 2). Figure 2 also shows that mud viscosity is high at low shear rate, which is beneficial for suspending and transporting cuttings.
In addition to their principal applications in leather manufacture and dyeing, tannins are used in the clarification of wine and beer, as a constituent to reduce viscosity of drilling mud for oil wells, and in boiler water to prevent scale formation.
Then mud viscosity and filtrate were measured.
Moreover, mud viscosity increased significantly after heating.
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