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A method for increasing the viscosity at low shear rate and the difficult to rent viscous liquids containing of refraction of divalent cations, and the thus obtained liquids
A method for increasing the viscosity at low shear rate and the difficult to rent viscous liquids containing of refraction of divalent cations, and the thus obtained liquids
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机译:一种在低剪切速率下增加粘度和难于租借的含有二价阳离子折射的粘性液体的方法,以及由此获得的液体
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摘要
Disclosed is a method of increasing the low shear rate viscosity and the shear thinning index of aqueous fluids containing a divalent cation salt, a crosslinked amylopectin starch which functions as both a viscosifier/suspending agent and as a fluid loss control additive, and a bridging agent, the fluids resulting from the method, and the use of the fluids in drilling a well, wherein the bridging agent is a sized particulate magnesium carbonate or a mixture of sized magnesium carbonate and sized calcium carbonate. The median (D50) particle size of the magnesium carbonate is from about 2 &mgr;m to about 10 &mgr;m. The weight ratio of calcium carbonate to magnesium carbonate is from about 70/30 to about 0/100.
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