Method for evaluating rheological property of water-based drilling fluid

• Main Authors: ZHANG DUNLAN, TANG RUNPING, HE TAO, LI JUNCAI, OU MENG, YAN JUAN
• Format: Patent
• Language: Chinese; English
• Published: 12.10.2016
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for evaluating the rheological property of water-based drilling fluid. The method comprises the following steps that 1, water-based drilling fluid test slurry for shale gas is prepared for use; 2, the apparent viscosity of the drilling fluid test slurry shown every time the temperature is increased by 10 DEG C is measured through a 130-77 high-temperature high-pressure rheometer; 3, the change curve of the apparent viscosity along with the temperature is drawn; 4, a0, a1 and a2 in a fitted equation are calculated according to a normal equation system fitted through a least square method polynomial, and the fitted equation is obtained; 5, the fitting effect of a linear regression equation is judged according to the regression sum of squares, the residual sum of squares and a correlation coefficient R. According to the method, the changes of the apparent viscosity of the drilling fluid for the shale gas under different temperature conditions can be well described to evaluate the