Measurement of the Plastic Viscosity and Yield Point of Drilling Fluids
Dinara Delikesheva, Askar Kh. Syzdykov, Jamilyam Ismailova, Arman A. Kabdushev, G.A. Bukayeva
Abstract
Rheological parameters of drilling fluids, such as yield point and plastic viscosity, are required to determine the hydrodynamic components of pressure at various points in the circulation system during technological operations. It is essential to ensure a simple and accurate measurement of these parameters in the construction of oil and gas wells, however, existing methods are relatively expensive and the results obtained can be subjective. This article describes a newly developed method for measuring the plastic viscosity and yield point of the drilling fluid using a Marsh funnel, which will greatly simplify the procedure for determining the rheological parameters of drilling fluids and allow them to be measured directly on drilling rigs. When the geometrical parameters of the funnel are determined, the true viscosity parameters are calculated using simple formulas. The Marsh funnel is traditionally used on the drilling rig to measure the relative viscosity of the drilling fluid and is an inexpensive and simple device. The article provides comparative studies with standard methods for determining the rheological parameters of the drilling fluid. According to the results of the test method, comparisons are made of pressure losses in the circulation system of the drilling fluid on drilling rigs.