ACID TREATMENT METHOD OF BOTTOMHOLE ZONE OF CLUSTER WELL Russian patent published in 2020 - IPC E21B43/27 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil industry, in particular to methods of increasing oil recovery of formation by formation of cracks using acid. Method of acid treatment of bottomhole zone of cluster well includes extraction of two production wells nearby the well with water content of not more than 30 %. From the donor well, a pipeline is laid, which connects the donor well pump line with the other acceptor well annulus. Pumping into the bottomhole zone of the required volume of the acid composition is carried out through the acceptor annulus without extraction of the pumping equipment with subsequent exposure for 2–3 hours. After holding for the acid composition selling, the flow of the extracted donor product is directed through the pipeline into the acceptor annulus with pressure not exceeding the pressure of the hydraulic fracturing of the formation. Preparatory-final operations and well start-up are performed.

EFFECT: proposed method of acid treatment of bottomhole zone of cluster well is simple, reliable and cheap to use due to use of pumping equipment and production of formation of nearby well.

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