| 摘要 |
oil producing industry, particularly, development of oil pool under complicated geological conditions characterized by zonal and stratified nonuniformity. SUBSTANCE: method includes injection of working agent into at least one well and oil withdrawn through at least one producing well hydrodynamically communicated with one or several injection wells. In this case, preliminarily determined in injection well is intake rate of at least one producing formation in oil pool depending on injection pressure and with control of coverage of producing formation thickness with injection agent. Upon attainment of full coverage of producing formation characterized by efficient pressure and intake rate, injection pressure is further increased by higher flow rate of injected agent up to critical pressure characterized by sharp increase of intake rate of producing formation. After that, injection pressure is reduced to below critical one but not below efficient pressure, and fringe of water-resistant composition is injected into well with its subsequent forcing into formation. Then injection well is shut-in and let its stand. In this case, fringe of water-repellent composition is injected into producing well and forced into formation but in amount larger than into injection well. Further on, producing well is also shut-in and let it stand for treatment of pool. Then under new conditions of filtration, test injection of working agent is effected with control of intake rate of producing formation and its coverage depending on injection pressure. If efficient intake rate is attained with injection pressure less than previously noted efficient pressure by 15-20%, main injection of working agent is undertaken at reduced pressure and oil is withdrawn through producing well on industrial scale. EFFECT: increased coefficient of oil recovery due to possibility of provision of practically piston displacement of oil at minimal power consumption due to preliminary opening of joined vertical fractures of pool before its treatment. 12 cl |
