BOTTOM-HOLE FORMATION ZONE TREATMENT METHOD Russian patent published in 2009 - IPC E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to bottom-hole formation zone treatment technology with large gas column and with heterogeneous collecting properties under conditions of abnormally low formation pressures, and can be used in gas industry. Bottom-hole formation zone treatment method involves cyclic pumping of acid solution and the blocking composition to the formation. In addition, acid solution contains surface-active compound and stabiliser of iron ions; hydrous gel based on polysaccharide with a stitcher is used as the blocking composition; hydrous gel volume is 40-70% of oxygen solution volume; when those are pumped, they are nitrogen-dispersed; treatment is completed with pumping the above acid solution with its being flushed with service water and nitrogen.

EFFECT: simplifying the well reagent pumping process, increasing penetrability of acid solution to fine-pored collectors with small cracks, and involving non-developed interlayers of productive layer, which have not participated in formation of the well flow rate before.

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