| 摘要 |
FIELD: oil and gas producing industry, particularly, methods of shutoff of water inflow to oil and gas wells before well casing. SUBSTANCE: method includes separation of interval of water- saturated bed, injection of isolating material to bottomhole and wellbore zone of water-saturated bed with use of hydraulic pressure jets before well casing. Injected to said zones is isolating material in form of gel-cement slurry with isolation of high-permeability zone of water-saturated bed under excessive pressure at sealed wellhead of 6.5 Mpa. Filtration surfaces of wellbore zone are isolated with help of hydraulic pressure jets of said slurry at speed of tool lifting of 0.4 m/s. After that, residues of gel-cement slurry are washed out to surface, and casing string is lowered into well and cemented. EFFECT: increased oil-gas recovery from formations and prolonged water-free oil production period by higher quality, efficiency and reliability of waterproofing operations. 1 ex |
