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    Apr 08, 2014· Methylhydroxyethyl cellulose may be used as an additive in cement slurries in the treatment of wells to prevent or reduce the occurrence of gas channeling. In addition to acting as a gas control addit ... it may cause the formation of thick filter cakes of cement solids. Such filter cakes may plug the wellbore. In addition, fluid ...

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    Cement slurries can lose water to permeable zones causing a number of problems such as: insufficient mud displacement, high viscosity, unwanted change of settime, and final compressive strength. Fluid loss additives reduce water loss through the cement filter cake, which makes them especially useful in squeeze cementing.

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    The mechanism of the action of fluid loss control additives in cementing oilwell operations is principally the reduction of permeability of the cement filter cake.

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    A fluid loss additive for addition to a cement slurry used in cementing a casing string in a wellbore. The additive reduces loss of water from the slurry into the formation, resulting in a better cement job. ... These gelballs deform by flattening, and become a part of the filter cake, greatly reducing the filter cake permeability, thus giving ...

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