DEVELOPMENT METHOD OF BOTTOM-HOLE ZONE OF TERRIGENOUS OIL FORMATION Russian patent published in 2013 - IPC E21B43/27 E21B43/22 C09K8/72 

FIELD: oil and gas industry.

SUBSTANCE: according to the method of development of bottom-hole zone of terrigenous oil formation, before pumping of acid solution well is killed by solution of alkali metal hydroxide adding potassium and/or natrium chloride in quantity 0-35 wt % to obtain optimum density of composition, then well is pumped with aqueous solution containing 4-8 wt % of chlorhydric acid and 0.5-1.5 wt % of fluorhydric acid adding versene (trilon "B") in quantity 0.01-0.5 wt %, sodium dodecylsulfate in quantity 0.01-0.1 wt %, then aqueous solution of oil wetting agent NG-1 with concentration 0.01-2 wt % is pumped into formation.

EFFECT: improving efficiency of development of bottom-hole formation zone due to prevention of sedimentation of reaction products of solution chlorhydric and fluorhydric acid with rock of bottom-hole formation zone, reducing water content of well products due to modification of reservoir rock wetting, hardening of porous medium due to use of hydrophobisated reagents.

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