交联聚合物驱技术的矿场应用效果及开采特征

FIELD APPLICATION AND PRODUCTION BEHAVIOR OF CROSS-LINKING POLYMER FLOODING TECHNOLOGY

针对河南油田聚合物驱技术存在用量高,抗温抗盐性差,调整剖面能力弱,易串流等局限性,提出了使用交联聚合物驱技术。并在下二门油田H2Ⅲ油组Ⅱ2断块实施了大规模的工业化矿场先导性试验。对比交联聚合物驱与聚合物驱的开发效果,认为交联聚合物体系在地层中的注入性良好,压力上升幅度比聚合物驱大且调整剖面的能力比聚合物驱强,产液能力弱,动液面下降幅度大,转后续水驱后,含水仍处在较低水平,产量降幅小,有效地延缓了后续水驱突破。对于指导其他油田的弱凝胶调驱技术的矿场应用具有一定的指导意义。

In Henan oilfield, polymer flooding technology is applied with high consuming amount of polymer, poor resistance to temperature and salt, weak profile modifiability and easy inter-aquifer flow, herein cross-linking polymer flooding technology is developed, and large-scale pilot test is implemented in H2Ⅲ fault block unit of Xia-er-men oilfield. Comparing the production performance of cross-linking polymer flooding with polymer flooding, the cross-linking polymer system shows better injectivity, higher injection pressure rise and better profile modifiability, weaker fluid productivity and larger producing fluid level drop than polymer flooding. Especially in the post-water flooding phase, the cross-linking polymer slug has effectively retarded the post-water breakthrough and retained good production behavior at lower water cut and oil production decline. Cross-linking polymer flooding technology plays a definite guidance role in field application of weak gel profile modifiability for other oilfield.