METHOD FOR DEVELOPMENT OF OIL POOL Russian patent published in 1995 - IPC

FIELD: development of oil pools. SUBSTANCE: method for development of oil pool includes cyclic injection into formation through injection well of fringes of water with addition of foaming agent and fringes of gas, and withdrawal of oil through producing well. In this case, foaming agent is used in form of biopolymer produced by bacteria PSEUDOMONAS PUTIDA 110. During each cycle, injected through injection well is fringe of water with addition of biopolymer produced by bacteria PSEUDOMONAS PUTIDA 110. Fringe of water with biopolymer produced by bacteria PSEUDOMONAS PUTIDA 110 additionally contains nutrient solution with suspension of live bacteria PSEUDOMONAS PUTIDA 110 with concentration of 1×10⁷-5×10⁷ cells/ml. Nutrient solution contains the following components, g/l: K₂HPO₄ 4.3; KH₂PO₄ 3.4; (NH₄)₂SO₄ 4.0; MgSO₄ 7H₂O 0.5; CaCO₃ 0.3; NaCl 5.0; KCl 0.2; molasses 20.0; the balance, water; solution pH 7.0-7.2. Water fringe with addition of biopolymer produced by bacteria PSEUDOMONAS PUTIDA 110 is injected only in the first cycle. Fringe of water with addition of biopolymer produced by bacteria PSEUDOMONAS PUTIDA 110 and nutrient solution with suspension of live bacteria is injected only in the first cycle. Injection through injection well of fringe of water with addition of biopolymer produced by bacteria PSEUDOMONAS PUTIDA 110 is effected in the first cycle, and injection of water fringe with addition of nutrient solution with suspension of bacteria PSEUDOMONAS PUTIDA 110 is effected in the second cycle. EFFECT: higher efficiency. 6 cl