PLACING A FLUID COMPRISING KILN DUST IN A WELLBORE THROUGH A BOTTOM HOLE ASSEMBLY Russian patent published in 2018 - IPC E21B43/22 C09K8/02 E21B33/13 

FIELD: chemistry.

SUBSTANCE: invention relates to underground operations, and in particular to the placing fluids containing kiln dust, into the wellbore through the assembly of the bottom of the drill string. In a method, a borehole is drilled in a subterranean formation using a bottom hole assembly connected to a tubular member. Between the walls of the tubular member and the wellbore, an annular space is formed. Thickening displacing fluid is injected into the annulus of the wellbore through the bottom hole assembly. At the same time thickening displacing fluid contains oven dust and water. Assembly of the bottom of the drill string contains a drill bit. Thickening displacing fluid is pumped through the drill bit. In this case, the thickening displacing fluid is pumped into the wellbore between the drilling fluid and the cement composition.

EFFECT: technical result is an increase in the efficiency of the method due to a reduction in the time for drilling, fixing and cementing with displacing liquids.

14 cl, 7 dwg, 8 tbl