适用于高孔高渗油田的堵剂性能评价及优选

Performance Evaluation and Optimal Selection of Plugging Agents for High-porosity and High-permeability Oilfields

为了解决渤海SZ36-1油田高孔高渗储层在进入'双高'阶段后的含水率上升、非均质性严重、大孔道窜流等问题,选择三种堵剂体系进行室内评价实验,以期优选出一种适用于SZ36-1油田的堵剂。主要包括堵剂与地层流体及不同渗透率岩心的配伍性、pH值稳定性、选择封堵性。结果表明,三种堵剂均能与地层水配伍性良好,且在中、弱碱性环境中成胶效果更好;其中DQ-1具有一定油溶性,且封堵及剖面改善程度最弱,BH-2的油溶性最小、封堵率最高。

In order to solve the problems of water cut rising,serious heterogeneity and large pore fluid channeling in the high-porosity and high-permeability reservoirs of Bohai SZ36-1 oilfield,three kinds of plugging systems were selected for laboratory evaluation experiments,in order to screen out a suitable plugging agent for SZ36-1 oil field.The compatibility of plugging agent with formation fluid and different permeability cores,pH stability and selective plugging of the three plugging systems were studied.The results showed that all three plugging agents had good compatibility with formation water,and the gelation effect was better in medium and weak alkaline environment.Among them,DQ-1 had a certain oil solubility,and the degree of plugging and profile improvement was the weakest.BH-2 had the lowest oil solubility and the highest blocking rate.