The Effect of Viscosity on Hole cleaning in Vertical and Deviated Wells – Experimental Study

During the drilling process, cutting concentration in vertical and inclined wells is a common problem and major issue in designing hydraulic parameters. This is becoming more important in near bit area. Cutting transport usually is affected by several parameters such as mud rheology flow rate, nozzle size, rotation speed hole inclination etc. In this work it was aimed to design a new set-up to test the effect of viscoity on hole cleaning phenomenon especially in near bit area. The set-up consists of a 16 (5 meter) feet long flow loop, 3.28 feet (1m) height of the test section, and 2.95 inches (7.5 cm) inner diameter of the test section. Each parameter which has an impact on hole cleaning could be varied. To observe the exact effect of viscosity other factors such as flow rate and RPM considered as a variable factor in different hole inclination (0ᵒ to90ᵒ from vertical). For each test, 0.66 pounds of solid particles were used. After each test, the amount of output particles was evaluated under turbulent fluid flow regime. In conclusion, in this work results show that: water is becoming an effective drilling fluid as the inclination of the set-up increases and the viscosity influence decrease when the inclination comes from 0 to 90

کلیدواژه ها:

Hole Cleaning ، Drilling Fluid ، Viscosity ، Inclined Well ، Experimental Design