MUD ACID TREATMENT METHOD OF BOTTOM-HOLE ZONE Russian patent published in 2011 - IPC E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: in mud acid treatment method of bottom-hole zone of injection well for performing the treatment there chosen is the well which uncovers productive formation with permeability of 500-1000 mD, porosity of not less than 20%, clay content of not more than 3%, number of uncovered formations or interlayers 2 and more, total perforation thickness of 5 m and more, with pumping volume of working agent through well from the beginning of development of not more than 500 thousand m³. Prior to mud acid treatment, mud acid bath is built in well. Then mud acid treatment is performed - mud acid is pumped; during pumping of mud acid the pumping volume is specified on the basis of 1-1.5 m³ per 1 m of perforated formation thickness. After mud acid is pumped, process exposure and development of well is performed. At working agent pumping volume through the well from the beginning of development of more than 500 thousand m³ the mud acid pumping pressure is increased to maximum possible as per the well conditions.

EFFECT: higher efficiency of mud acid treatment of bottom-hole zone of injection well.

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