中原油田文25 东块聚合物微球调驱研究与应用

针对中原油田高温高盐油藏开发后期的剩余油挖潜，提出了聚合物微球深部调驱的技术设想；以现有微球制备技术为基础，通过调整水相比、交联比和耐温抗盐单体共聚，研制出了适于文东试验区孔喉尺寸及油藏特征的系列调驱微球，并在高温高盐的油藏条件下，评价了微球的膨胀性能、抗剪切强度和持久稳定性；采用均质和非均质填砂模型，模拟了微球浓度、注入量和注入模式对调驱效果的影响，为矿场试验方案的合理制订提供了理论支撑；文25 东微球调驱矿场试验共实施2 个层系9 个井组，通过“PI 技术”的动态调整，共注各类调驱微球276.58 t，总体实现了注入压力升高、波及体积改善和明显增油的目的；通过微球调驱，区块自然递减显著下降，油田稳产基础进一步得到增强。

Experimental Evaluation and Field Application of Pre-crossLinked Polymer Particle Flooding in Eastern Wenliu Block 25of Zhongyuan Oilfield

To further exploit remaining oil in reservoirs with high temperature and high salinity，pre-cross linked polymer particle（PCPP）flooding was supposed to be employed in Zhongyuan Oilfield. Based on present PCPP synthesizing techniques，a series of PCPPs which fit for the pore size and reservoir characteristics have been developed by methods such as proportionadjustment of water phase and cross linker as well as copolymerization of temperature and salt resistant monomers. Swellingability，anti-sheering strength and duration stability were tested on PCPPS and verified for their flooding qualification. Homogeneousand heterogeneous experimental models were also employed to study the influences of such factors as concentration，mass quantity and injection mode of PCPPs on oil recovery，which directly provided academic supporting for field floodingdesign. The field application，in which a total of 276.58 t of PCPPs was injected under the guiding of PI technology，was carriedout on 9 well groups in two different development units of Eastern Wenliu Block 25. Results have seen elevated injectionpressure，improved sweep efficiency and increased oil production. The overall slowdown in the natural decline rate brought byPCPP flooding has further solidified the foundation of stable oil production in this block.