METHOD OF WELL DEVELOPMENT BY CREATING DEPRESSION ON FORMATION Russian patent published in 2012 - IPC E21B43/25 

FIELD: oil and gas production.

SUBSTANCE: method consists in descending of tubing string - TS, replacement of fluid filling the well by aerated water solution of surface-active agent - SAA, formation acid treatment, causing of fluid influx from formation. According to the invention the well development is done by sequential use of cycles of aerated water solution of SAA pumping and acid treatment. Aerated water solution of SAA pumping cycle is done by descending of flexible pipes - FP into the TS not lower than the lower edge of TS. SAA solution aeration is done at the well mouth till obtaining the necessary volume of stable foam system that is pumped through FP filling the inner area of TS. After causing of formation fluid influx FP is descended till the bottom hole and the well is flushed by process fluid with the following determination of affluent-productive characteristics of the formation. After that formation acid treatment cycle is carried out, it includes sequential pumping of 1/3 of total volume of hydrochloric acid and 2/3 of drilling mud acid through FP squeezed by process fluid into formation. After that there held is process exposure necessary for maximum efficiency of acid treatment, FP is lifted to the TS entry into the required interval, after that the cycle of aerated SAA solution pumping is carried out.

EFFECT: increase of method efficiency due to the use of stable foam system and possibility to control depression value against the formation in the course of well development.

2 cl, 1 dwg