DEVICE FOR CLAY ROCK SWELLING PREVENTION IN OIL PRODUCTION WELL (VARIANTS)

摘要

FIELD: oil production industry, particularly for well operation in complicated environment.;SUBSTANCE: plant includes main cased well bore, additional well bore provided with extension pipe and pump. In accordance with the first embodiment main well bore is drilled up to reaching roof of upper clay rock interval. Extension pipe is arranged in additional bore of oil production well, spaced therefrom and is not subjected to cementation. Extension pipe is provided with packing devices located above roof of each clay rock interval penetrated by additional bore of oil production well. Extension pipe is perforated below bottom of each clay rock interval and provides clay rock interval flooding with oil during production well operation. In another embodiment main oil production well bore is drilled up to reaching roof of upper clay rock interval. Extension pipe is arranged in additional bore of oil production well, spaced therefrom and is not subjected to cementation. The extension pipe is connected with pump. Lower end of the extension pipe extends below clay rock interval and provides flooding of above interval with oil during oil production well operation.;EFFECT: increased oil production output and reliability of clay rock interval isolation from water.;2 cl, 2 dwg