The Simulation of Ester Lubricants and Their Application in Weak Gel Drilling Fluids
Author:
Dai Yao12, Lu Fuwei12, Tang Yuhua3, Wang Yuanyuan3, He Xinyi12, Wang Tengfei12, Wu Juan12
Affiliation:
1. College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China 2. Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields, Yangtze University, Jingzhou 434023, China 3. Petroleum Engineering Technology Research Institute of Sinopac Jiangsu Oilfield Branch Company, Yangzhou 225009, China
Abstract
To enhance the performance and reduce the amount of ester-based lubricants used in weak gel drilling fluids, a shear dynamics simulation under extreme pressure conditions was employed to refine the formulation of the base oil and pressure additives. The simulation results were validated using fatty acid methyl, ethyl, and butyl esters. Fatty acid methyl ester demonstrated the lowest temperature increase and the highest load-bearing capacity post-shear. The four-ball friction test revealed that methyl oleate had a coefficient of friction of 0.0018, approximately a third of that for butyl oleate, confirming the simulation’s accuracy. By using methyl oleate as the base oil and oleamide as the pressure-resistant component, the optimal shear stress was achieved with a 10% addition of oleamide. A lubricant composed of 90% methyl oleate and 10% oleamide was tested and showed a coefficient of friction of 0.03 when 0.5% was added to bentonite slurry, indicating a strong lubricating film. Adding 1% of this lubricant to a low gel drilling fluid system did not affect its rheological properties, and the gel structure remained stable after seven days of aging. Field tests at the Fu86-3 well in the Jiangsu Oilfield of Sinopec confirmed that adding 1% of the ester-based lubricant to the drilling fluid significantly improved drilling efficiency, reduced drag by an average of 33%, and increased the drilling rate to 22.12 m/h. This innovation effectively prevents drilling complications and successfully achieves the objectives of enhancing efficiency.
Funder
National Natural Science Foundation of China Youth Project
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