METHOD OF TREATING BOTTOM-HOLE ZONE OF HIGH-TEMPERATURE LOW PERMEABILITY ALEURITE-ARGILLACEOUS RESERVOIRS OF LATITUDE OB REGION JURASSIC DEPOSITS Russian patent published in 2002 - IPC

FIELD: oil and gas producing industry, particularly, increase of productivity of oil-producing wells tapping high-temperature low-permeability aleurite-argillaceous reservoirs of latitude Ob region Jurassic deposits. SUBSTANCE: method includes successive injection into formation of spacer fluid, acid composition and again spacer fluid. Acid composition is forced into formation by aqueous solution of acetic acid. Spacer fluids are used in the form of oxygen-containing solvents. Treatment is effected under dynamic conditions without leaving of injected reagents on bottom-hole zone for reaction. Acid composition is used in the form of mixture of hydrochloric and acetic acids with oxygen-containing solvent in the form of mixture of isopropyl alcohol with glycols or cellosolves. The technical result of claimed method is higher efficiency of acid treatment of high-temperature low-permeability aleurite-argillaceous reservoirs due to prevention of processes of secondary sedimentation and gel formation from reaction products with increased penentration capacity of acid composition into formation and fuller removal of used solution and reaction products from zone of treatment. EFFECT: higher efficiency. 3 cl, 3 ex