LUBRICATING ADDITIVE FOR DRILLING FLUIDS Russian patent published in 2000 - IPC

FIELD: oil and gas production. SUBSTANCE: water-based additive contains 50-80% of triglyceride C₁₄-C₂₄-fatty acids, 3-6% of neutralization agent, and 5-30% of polyethylene glycol ether of monoisononylphenol with 6-12 ethylene glycol units in radical. Additive is suitable when drilling directional and horizontal holes aiming to preserve initial reservoir properties of productive formation. EFFECT: improved lubricating and process characteristics of drilling mud and reduced interphase tension of drilling mud filtrate in contact with kerosene. 4 tbl