![]() ![]() The procedure to obtain the zero shear viscosity from creep-recovery test is shown in detail. A method of using creep-recovery data to evaluate the settling of particles is discussed. Creep compliance, a material function of fluid, is analyzed and compared. This test procedure provides a guideline for other experimental investigations. A standard experimental procedure is designed to obtain creep-recovery data of sixteen drilling fluids. In this search, creep-recovery test is used to obtain the viscoelastic properties of drilling fluids. Therefore, the petroleum industry still lacks a rheological tool to evaluate fluids in term of particle transportation and structure stability. ![]() In addition, a standard test procedure for dynamic test is not available. However, current rheological characterization is not sufficient to evaluate these important properties. These viscoelastic properties can be determined through dynamic tests including oscillatory, creep-recovery and relaxation tests. Hence, it governs particle settling and the invasion of fluid into the formation. Viscoelastic properties of fluid are the measurement of the gel structure, structure stability and gelling speed. Viscoelasticity has received much attention from the petroleum industry since many phenomena are related to it. However, under infinitesimal deformation or high shearing speed, drilling fluids behave viscoelastically. The relaxation time of drilling fluids is small compared to operational time, so under normal steady shear, the viscous response is dominant. ![]()
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