OIL-WELL MIX FOR GENTLY SLOPING AND HORIZONTAL WELL STABILIZING Russian patent published in 2005 - IPC

FIELD: oil production, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: oil-well mix comprises oil-well cement, stabilizing reagent, mineral additive and water. Mineral additive is selected from sodium chloride and potassium chloride. All above components are taken in the following amounts (in parts by weight): oil-well cement - 100, stabilizing reagent - 0.2-1.2, mineral additive - 2.0-3.0, water - 40-50. Stabilizing reagent having resistivity to polymineral attack is selected from Sulfacell S (hydroxyethyl cellulose) or complex fluid-loss additive. Oil-well mix including Sulfacell S optionally has antifoaming additive.

EFFECT: increased efficiency of well stabilizing and formation isolation due to suppression of sedimentation process and prevention of solid phase deposition on lower well bore wall and forming channel at upper wall thereof by increased resistance to sedimentation, retention of collecting properties of producing formations and improved protection of well bore area against contamination from oil-well mix filtrate due to decreased filtration thereof along with retention of process parameters enough to inject oil-well mix into well and penetration thereof in hole annuity.

3 cl, 4 ex, 1 tbl