FIELD: mining.
SUBSTANCE: method of preparation for cementing of wells drilled using invert-emulsion drilling mud is characterised by the fact that casing column is lowered into the well and washed with invert-emulsion drilling mud; four flush fluids are pumped subsequently into the well: parting-displacement fluid, solvent fluid, washing fluid and displacement fluid, and their further forcing to behind-the-casing space with well cement mortar and flushing fluid with their complete displacement from the well and installation of well cement mortar in behind-the-casing space at the required interval; at that, mixture of invert-emulsion drilling mud with formation water and with organic solvent in volume ratio of (4-6):(2.5-5.5.):(0.5-1.5) respectively is used as parting-displacement flush fluid; mixture of organic solvent, tall oil and 40% of water solution of sodium hydroxide in volume ratio of (9.0-9.6):(0.2-0.5):(0.2-0.5) respectively is used as solvent flush fluid; water solution of detergent also acting as demulsifying agent with 0.5-4% mass concentration is used as washing flush fluid; light-weight cement slurry with density of 1.35-1.45 g/cm3 is used as displacement flush fluid. At that, rheological characteristics: plastic viscosity and dynamic shear stress of solvent flush fluid are higher than rheological characteristics of the previous one - parting-displacement fluid, and further washing flush fluid, and density and rheological characteristics of displacement flush fluid are higher than those of the previous one - washing flush fluid.
EFFECT: increasing the volume of dense contact of cement stone with enclosing surfaces.
4 cl, 1 ex, 3 tbl
Title | Year | Author | Number |
---|---|---|---|
PLUGGING MATERIAL FOR MAKING OF BRIDGES IN WELL DRILLED INVERTED-EMULSION DRILLING MUD (VERSIONS) | 2013 |
|
RU2525408C1 |
FLUSH FLUID | 2015 |
|
RU2592308C1 |
SPACER FLUID FOR SEPARATING HYDROCARBON OIL-BASE DRILLING MUD AND PLUGGING-BACK WATER-BASE MORTAR | 0 |
|
SU1104240A1 |
FLUSH FLUID | 2017 |
|
RU2674348C1 |
SPACER LIQUID USED IN CEMENTING OF CASING STRINGS | 2008 |
|
RU2378313C1 |
METHOD OF PREPARING WELLS TO CEMENTATION | 1999 |
|
RU2137906C1 |
METHOD OF CEMENTING OF WELLS | 2006 |
|
RU2335618C2 |
METHOD FOR STRING CEMENTING IN WELL USING CEMENT MORTAR WITH EROSION PROPERTIES | 2009 |
|
RU2398095C1 |
BUFFER FLUID | 0 |
|
SU635223A1 |
PROCEDURE FOR FIXING WELL WITH CEMENT GROUT | 2009 |
|
RU2398955C1 |
Authors
Dates
2012-06-10—Published
2010-12-16—Filed