COMPOSITION FOR SEALING WATER INFLOW IN OIL AND GAS WELLS (VERSIONS) Russian patent published in 2010 - IPC C09K8/512 

FIELD: chemistry.

SUBSTANCE: invention relates to oil and gas industry, particularly to compositions for increasing oil production of productive strata by waterproofing production wells in order to reduce water content of the extracted product. The invention can also be used in protecting structures from the effect of moisture. When used to seal water inflow in oil and gas wells at temperature 30-50°C, the composition contains the following (in pts. wt): phenol-formaldehyde resin SFZ-3027B 100, resorcin 5-10, lignosulphonate FKLS-M 5-10, formaldehyde (40% aqueous solution) 5-10. When used at temperature 55-85°C, the composition contains the following (in pts. wt): phenol-formaldehyde resin SFZ-3027B 100, resorcin 5-10, lignosulphonate FKLS-M 5-10. When used at temperature 100-115°C, the composition contains the following (in pts. wt): phenol-formaldehyde resin SFZ-3027B 40-67, furfurol-formaldehyde resin KF-90 33-60, resorcin 2-3.5, lignosulphonate FKLS-M 1-2.

EFFECT: reduced shrinkage and wider temperature range for using compositions for sealing production wells.

3 cl, 4 tbl, 10 ex