EXPANDING PLUGGING MATERIAL Russian patent published in 2009 - IPC C09K8/467 

FIELD: construction.

SUBSTANCE: expanding plugging material contains the following components, wt %: Portland cement 91.3-98.3; specified expanding agent 0.5-5.0; setting accelerator 0.1-3.0; fluid loss agent 0.1-0.5; superplasticiser 0.1-0.7; defoaming agent of POLYCEM DF brand 0.1-0.3. Expanding plugging material additionally contains locking liquid - water at water-cement ratio of 0.47-0.78, as setting accelerator - calcium or sodium chloride, as superplasticiser - melamine formaldehyde or CEMPLAST MF or C-3 or Melflux, as fluid loss agent - oxyethyl cellulose.

EFFECT: higher insulation capacity of cement stone produced from plugging material, due to higher extent of its expansion and increased strength of adhesion to column and walls of well at broad range of water-cement ratio.

5 cl, 2 tbl, 1 ex