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目前大庆油田一类油层聚合物驱即将结束,三次采油对象逐渐转入二、三类油层,由于层间差异大、渗透率低、薄差层对中、高分子量聚合物适应性差,采用同一种分子量聚合物驱替,造成低渗透油层注入困难、动用程度低,影响聚驱开发效果。针对这一问题,研究了聚合物驱分质分压注入技术,该项技术通过分子量调节器和压力调节器切割出适合薄差油层的聚合物分子量,提高了油层整体动用状况,改善了聚合物驱开发效果。
At present, the polymer flooding of a first oil layer in Daqing Oilfield is coming to an end. The tertiary oil recovery objects are gradually transferred to the second and third types of reservoirs. Due to the large difference between layers, low permeability and poor adaptability of the thin layer to medium and high molecular weight polymers, Molecular weight polymer flooding, resulting in low permeability oil injection difficulties, the low degree of use, the impact of poly-drive development. In response to this problem, polymer flooding partial pressure injection technology was studied. The technology regulates the molecular weight of polymers suitable for thin oil reservoirs by molecular weight regulators and pressure regulators to improve the overall utilization of the oil reservoirs and improve the polymer Drive development effect.