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首页> 外国专利> RECOVERY METHOD OF ZONE-HETEROGENETIC OIL RESERVOIRS BY IMPULSE LOW-MINERALIZED WATER FLOODING

RECOVERY METHOD OF ZONE-HETEROGENETIC OIL RESERVOIRS BY IMPULSE LOW-MINERALIZED WATER FLOODING

机译：冲淡低矿化注水采油方法研究地层非均质油藏

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FIELD: oil and gas industry.;SUBSTANCE: method is carried out by a cyclic increase and decrease in working substance injection pressure in injection wells. Low-mineralized water is used as a working substance. Injection well is placed in the center. Production wells are arranged around this well. Allowed range of oil-saturated reservoir permeability at the source area is not less than 30%. Low-mineralized water is taken from surface watercourses: rivers, lakes and seas. Water is pre-decontaminated and pre-filtered to suspended solids size less than 0.1 of average reservoir pore size with minimum permeability. Water injection to the injection well is started with a gradual increase in consumption from zero to the value at which injection pressure is (0.7-0.8)*Prock where Prock is vertical rock pressure of overlying rocks. Consumption is then reduced to the value at which injection pressure is (0.1-0.2)⋅Prock. Cycles of increasing/decreasing of low-mineralized water consumption are repeated many times. Consumption increasing and decreasing speed is set equal at the range of 2-50 m3/day per one injection well. Bhp value relation in source production wells is set inversely proportional to their reservoir permeability-formation thickness product.;EFFECT: increased oil recovery of zone-heterogeneous oil reservoirs.
机译：领域：石油：方法是通过周期性增加和减少注入井中工作物质的注入压力来进行的。低矿物质水用作工作物质。注入井位于中心。生产井围绕该井布置。源区油饱和油藏渗透率的允许范围不少于30％。低矿物质水取自地表河道：河流，湖泊和海洋。对水进行预净化和预过滤，使悬浮固体的大小小于平均储层孔径的0.1，并具有最小的渗透率。开始将水注入注水井的过程中，消耗量从零逐渐增加到注水压力为（0.7-0.8）* P rock 的值，其中P rock 为上覆岩石的垂直岩石压力。然后将消耗量降低到注入压力为（0.1-0.2）·P rock的值。低矿化水消耗量的增加/减少循环重复多次。每台注入井的消耗量增加和减少速度设置为等于2-50 m 3 /天。源生产井中的Bhp值关系与它们的储层渗透率-地层厚度乘积成反比。效果：提高了区域非均质油层的采油率。

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