METHOD FOR AFTER-RECOVERY OF OIL FROM FLOODED OIL BED OF INHOMOGENEOUS PERMEABILITY

摘要

FIELD: oil producing industry. SUBSTANCE: oil and sulfuric acid are cyclically injected into oil be with continuous measurements of pressure changes in the wellhead, and the intake capacity of the well. Sulfuric acid is injected until well intake capacity becomes stable while oil is injected until the injection pressure rises to 20-30% above initial pressure. After injecting the design amount of oil and sulfuric acid, water is injected into the bed until the pumping pressure drops below the pressure in the water conduit. Then the well is connected to the water conduit and oil displacement process is continued. Extraction product from the flow wells is continued until profitable flooding is attained. At oil-acid volume relations from 1: 2 to 1:10 the method increases displacement coefficient 2.8-2.9 times. EFFECT: higher efficiency of method achieved by more extensive flooding of bed. 3 cl, 2 tbl