Method for measuring rheological property of drilling fluid by using curved pipe on site

A method for measuring a rheological property of a drilling fluid by using a curved pipe on site, comprising the following steps:

• step 1:
• deriving relationship constants between friction coefficients of a drilling fluid through offline checking;
• step 2:
• calculating a Reynolds number Rei of the drilling fluid in an on-site curved pipe according to the relationship constants between the friction coefficients of the drilling fluid and a friction coefficient fci of the drilling fluid in the on-site curved pipe, wherein i denotes a number of times the drilling fluid flows through the on-site curved pipe, and i is a positive integer not less than 2;
• step 3:
• calculating an actual shear stress τwi of the drilling fluid in the on-site curved pipe according to the Reynolds number Rei of the drilling fluid in the on-site curved pipe, and calculating a shear rate γi of the drilling fluid according to the actual shear stress τwi;
• step 4:
• establishing a plurality of on-site models according to the actual shear stress τwi and the shear rate γi of the drilling fluid;
• step 5:
• determining an optimal on-site model according to correlations between the actual shear stress τwi and predicted shear stresses of the plurality of on-site models;
• and
• step 6:
• performing on-site measurement on the rheological property of the drilling fluid according to the optimal on-site model.