高强度柔弹性裂缝封堵剂力学性能评价及应用*

Mechanical Properties and Application of Fracture Plugging Agent with High Strength and Flexibility

吴天江 赵燕红 宋昭杰 程 辰

WU Tianjiang ZHAO Yanhong SONG Zhaojie CHENG Chen

为改善预交联凝胶颗粒稳定性差、易破碎，多轮次实施后效果逐渐变差等问题，以含芳烃单体和特种共聚 单体为主剂、过氧化苯甲酰为引发剂制得高强度柔弹性颗粒状的裂缝封堵剂。研究了该封堵剂的力学性能，并 在长庆裂缝性见水油藏进行了现场应用。结果表明，裂缝封堵剂的硬度较小，柔韧性好，有利于施工泵注。低温 环境下封堵剂邵氏硬度的变化小。在18~28℃下，封堵剂的邵氏硬度为18.6~18.9 HA。随温度升高，剪切应 力加载对应封堵剂的应变增幅增大，储能模量降低。温度对封堵剂损耗模量的影响较小。封堵剂断裂伸长率为 1352%~1358%，对应拉伸应力为1.20~1.56 MPa。封堵剂抗压形变能力较好，压缩应力增加，应变逐渐增大。 地层水矿化度对封堵剂柔弹性的影响较小。封堵剂在安塞油田现场应用的效果良好，投入产出比1∶2.92，累计 增油3768 t，有效改善了使用预交联凝胶颗粒调剖剂出现的问题。图6参14

In order to improve the poor stability and breakage of pre-crosslinking gel particles and the effect of gradual deterioration after multi-round profile control，a granular fracture plugging agent with high strength and soft elasticity was prepared by using aromatic monomer and special comonomer as main agent and benzoyl peroxide as initiator. The mechanical property of the plugging agent was studied and it was applied in Changqing fractured reservoir. The results showed that the hardness of plugging agent was small and the flexibility was good，which was good for pump injection. The change of shore hardness of plugging agent at low temperature was small. The value of shore hardness was 18.6—18.9 HA at 18—28℃ . The strain increment of plugging agent increased and the storage modulus decreased with the increase of temperature. Temperature had little effect on the loss modulus of plugging agent. The elongation at break of plugging agent was 1352%—1358%，and the corresponding tensile stress was 1.20— 1.56 MPa. The compressive deformation ability of plugging agent was good. When the compressive stress increased，the strain increased gradually. The salinity of formation water had little effect on the flexibility of plugging agent. The plugging agent had good effect in the field application of Ansai oilfield with the input-output ratio of 1∶2.92 and cumulative oil increment of 3768 t. It had effectively improved the problem of using pre-crosslinking gel particle profile control agent.

10.19346/j.cnki.1000-4092.2020.02.012