LUBRICATING COMPOSITIONS FOR WELLBORE FLUIDS Russian patent published in 2018 - IPC C09K8/00 C09K8/35 E21B21/00 E21B43/26 

FIELD: drilling of soil or rock.

SUBSTANCE: group of inventions refers to lubricants used in borehole fluids. Method includes circulating a wellbore fluid in a wellbore of a subterranean formation, wherein the well fluid is selected from the group consisting of a downhole fluid, a drilling fluid, a completion fluid, a fracturing fluid, a formation fluid, a repair fluid and a combination thereof. Wellbore fluid optionally comprises a salt selected from the group consisting of sodium chloride, calcium chloride, zinc chloride, potassium chloride, potassium bromide, sodium bromide, calcium bromide, zinc bromide, sodium formate, potassium formate, ammonium formate, cesium formate and mixtures thereof. Surface lubrication lubricant is added to the wellbore fluid. Lubricant includes choline chloride and sulfonated vegetable oil, the lubricant increases the lubricity of the fluid compared to the addition of only sulfated vegetable oil to the wellbore fluid.

EFFECT: improved lubrication of metal surfaces for reduction of functioning, twisting and axial loading.

12 cl, 4 dwg, 5 tbl, 7 ex