TREATMENT METHOD OF CARBONATE AND CARBONATE-CONTAINING FORMATIONS (VERSIONS) Russian patent published in 2011 - IPC E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: as per one version, in treatment method of carbonate and carbonate-containing formations by pumping to the formation through the well of helium-forming acid solution containing production waste of synthetic zeolite, lignosulphonate -LS, chlorhydric acid -CA and water; liquid production waste of synthetic zeolite NaX and/or NaA + NaA-Y is used as waste; pumping is performed in two stages with water flush to formation and stop for the period of helium formation, by using at the first stage the above solution at the following ratio of components, wt %: the above waste 50.0-60.0, LS 0.5-5.0, CA 7.0-12.0, water is the rest, at the second stage - the above solution at the following ratio of components, wt %: the above waste 20.0-40.0, LS 0.5-5.0, CA 10.0-15.0, and water is the rest. As per the other version, in treatment method of the above formations by pumping to formation through the well of helium-forming acid solution containing production waste of synthetic zeolite, LS, CA and water, liquid production waste of synthetic zeolite NaX and/or NaA-Y is used as the waste at the following ratio of components, wt %: the above waste 20.0-40.0, LS 0.5-5.0, CA 10.0-15.0, and water is the rest, and subsequent pumping of 7-12% CA solution, the first buffer of fresh water, liquid production waste of the above zeolite containing 2-5 wt % LS, the second buffer of fresh water, 7-12% CA solution and water flushing is performed in the volume of tubing string and wellhead of equipment.

EFFECT: higher treatment efficiency of formations and larger temperature limits of method application.

10 cl, 3 tbl, 6 ex