RECOVERY METHOD FOR NATURAL RESERVOIR PERFORMANCE DETERIORATED DURING WELL CONSTRUCTION Russian patent published in 2014 - IPC E21B43/22 C09K8/584 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas producing industry, in particular, to recovery method for natural filtration properties of the reservoir deteriorated during the well construction. The method lies in injection of the complex surfactant (ComSAS) mixed up with a solvent to the productive formation interval upon washing of the string with the subsequent flushing of ComSAS aqueous solution up to static balanced condition and process withhold. At that RaiR ComSAS aqueous solution in 1.5-2.5% concentration is used as ComSAS mixed up with the solvent. Completion of the productive formation is made in environment of the same RaiR aqueous solution with the same 1.5-2.5% concentration. Upon completion operations 2/3 of the above CompSAS aqueous solution volume is flushed to the well and the well is abandoned till it is developed by swabbing.

EFFECT: improved efficiency of the formation simulation, increased productivity of the well as well as reduced period of the well placing on production.