METHOD OF WATER PRODUCTION ZONES ISOLATION IN WELL Russian patent published in 2015 - IPC E21B33/138 C09K8/50 

FIELD: oil and gas industry.

SUBSTANCE: method of water production zones isolation in the well includes running in of the flow string at perforated nipple tubing string. Two-component grouting mixture with lengthy aggregating period prepared at the day surface, flush fluid and the second portion of aggregating agent are injected to the tubing string. At that before running of the tubing string in the water production zone and its specific injectivity is identified. Depending on depth of the water production zone and specific injectivity the aggregating volume and time for two-component grouting mixture with short aggregating period is defined, at that the latter consists of two-component grouting mixture with lengthy aggregating period and the second portion of aggregating agent. The two-component grouting mixture with lengthy aggregating period is prepared and the following mixtures are injected in sequence: flush fluid with density equal to density of two-component grouting mixture with lengthy aggregating period, two-component grouting mixture with lengthy aggregating period, flush fluid with density equal to density of two-component grouting mixture with lengthy aggregating period. Then the second portion of the aggregating agent is injected with density equal to density of two-component grouting mixture with lengthy aggregating period. By-pass plug with binding head is installed in the tubing string and flushed at pressure of 0.5 MPa by flush fluid with density equal to density of two-component grouting mixture with lengthy aggregating period to tubular and annular space. Circulation is induced by flush fluid with density equal to density of two-component grouting mixture with lengthy aggregating period through the upper radial openings till density values are balanced in tubular and annular space. Then the rubbing string is uplifted and during lifting the second portion of the aggregating agent with density equal to density of two-component grouting mixture with lengthy aggregating period is injected through the perforated end of the perforated tube to the two-component grouting mixture with lengthy aggregating period. Thereafter two-component grouting mixture with short aggregating period is flushed along annular space to the water production zone by flush fluid with density equal to density of two-component grouting mixture with lengthy aggregating period.

EFFECT: increasing efficiency of insulation of water production zone in well.

1 ex, 2 tbl, 3 dwg