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METHOD FOR LIMITATION OF WATER INFLOW TO WELLS AT THICK OIL DEPOSITS
METHOD FOR LIMITATION OF WATER INFLOW TO WELLS AT THICK OIL DEPOSITS
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机译:限制稠油油藏井注水的方法
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FIELD: oil and gas industry.;SUBSTANCE: method for limiting water inflow into wells at thick oil deposits involves pumping the water-insulating gel-forming composition into formation, containing the following components, wt %: sodium silicate 0.4-8.9%, potassium silicate 0.1-4.5%, chromium acetate 0.4-1.5%, the rest is water. After pumping the water-insulating composition in 1.5-3 hours later, alkali solution is pumped to restore permeability of the oil saturated intervals, pumping 10-20% aqueous solution of sodium hydroxide into the rim with volume not exceeding 0.1-0.2 pore volume of the bottomhole formation zone. The induction period for the gel-forming composition at the formation temperature is set to 3-6 hours. The break is chosen for 15-25 hours, during this time the composition completely transits from liquid to gel-like state.;EFFECT: increase the efficiency of oil displacement from formation by gel-forming compounds due to increased strength of said compositions to high formation temperatures, increased oil recovery coefficient, connection of oil-saturated low-permeability interlayers.;2 dwg, 1 ex
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机译:领域:石油:限制稠油层中水流入井的方法包括将水绝缘凝胶形成组合物泵入地层,该组合物包含以下重量百分比:硅酸钠0.4-8.9%,钾硅酸盐0.1-4.5%,乙酸铬0.4-1.5%,其余为水。在1.5-3小时后泵入水绝缘组合物之后,泵入碱溶液以恢复油饱和间隔的渗透性,将10-20%的氢氧化钠水溶液泵入轮辋,其体积不超过0.1-0.2孔体积。井底形成区。将形成凝胶的组合物在形成温度下的诱导时间设定为3-6小时。选择中断时间为25-25小时,在此期间组合物完全从液态转变为凝胶状。效果:由于所述组合物的强度增加至高,因此提高了凝胶形成化合物从地层驱油的效率。地层温度,提高的采油系数,饱和油的低渗透夹层的连接。; 2 dwg,1 ex
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