METHOD FOR TREATING BOTTOM-HOLE ZONE OF OIL BED Russian patent published in 1998 - IPC

FIELD: oil and gas production industry. SUBSTANCE: according to method, injected into oil bed is acidic compound, and additionally injected is alkali solution with subsequent retaining both compounds in well. Acidic compound has following components in following proportions: muriatic acid or mixture of muriatic acid and hydrofluoric acid, 7.0-20.0%; neonol, 0.5-10.0%; solvent, 1.0-40.0%; water, the balance. Alkali solution has following components in following proportions: neonol, 0.1-5.0; sodium carbonate, 5.0-25.0%; water, the balance. Application of aforesaid method and materials for treating bottom-hole zone of oil bed allows for increasing output of producing wells and it enhances injectivity of injection wells. This is achieved due to complex treatment of bottom-hole zone of oil bed created by terrigenous rock materials with inclusions of carbonate and clayey components complicated by residues of drilling mud and asphalt-, resin-, paraffin depositions. EFFECT: higher efficiency. 1 tbl