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关于提高油井产量的碱水注入工艺,这种方法是向井内注入含碱聚合物溶液。这种聚合物水解液粘度增加,注入井内的聚合物水解度低于15%。这种水溶液含有100～5000ppm的聚合物和100～5000ppm 的碱。这样的溶液能改进注入能力并提高驱油效率。最可取的做法是注入水解度多为5%～10%的聚合物。这种聚合物最好是聚丙烯酰胺(例如:聚丙烯酰胺的均聚物、聚甲级丙烯酰胺的均聚物,或丙烯酰胺和以甲级丙烯酰胺、N—烷基取代的丙烯酰胺、烷基丙烯酸盐及丙烯酸组成这组物质中选择一个单体的共聚物)。聚丙烯酰胺聚合物与某些试剂的水溶液混合,以便增加其在储油层中的粘度。这种聚合物溶液在储层中的驱油效果要比不含这种聚合物溶液好得多。使用聚丙烯酰胺的一个问题是:它们大大降低了注入油层中的注入率。这样低的注入率降低了采油速度,增加了资金回收期。
For the injection of alkali water to increase the production of oil wells, this method involves injecting an alkali-containing polymer solution into the well. The viscosity of this polymer hydrolyzate increases and the degree of polymer hydrolysis in the injection well is less than 15%. This aqueous solution contains 100 to 5000 ppm of polymer and 100 to 5000 ppm of base. Such a solution can improve the injection ability and improve oil displacement efficiency. The most desirable approach is to inject a degree of hydrolysis of more than 5% to 10% of the polymer. The polymer is preferably a polyacrylamide (e.g., a homopolymer of polyacrylamide, a homopolymer of polymethacrylamide, or a copolymer of acrylamide and acrylamide with acrylamide, N-alkyl, Alkyl acrylate, and acrylic acid). The polyacrylamide polymer is mixed with an aqueous solution of certain reagents in order to increase its viscosity in the reservoir. This polymer solution flooding the reservoir much better than without such polymer solution. A problem with polyacrylamide is that they significantly reduce the rate of injection into the reservoir. Such a low injection rate reduces oil recovery and increases the payback period.