缝洞油藏用苯丙树脂自黏堵剂的结构与性能

Structure and Property of Styrene-modified Acrylate Resin Self-adhesive Plugging Agent for Fracture cave Reservoir Plugging

王 萍 张桂林 孔德成 程 凯 张 潇 李再峰

WANG Ping ZHANG Guilin KONG Decheng CHENG Kai ZHANG Xiao LI Zaifeng

为满足塔河油田裂缝尺度不明确、孔隙结构复杂、高温和高矿化度油藏条件下对堵剂的封堵要求，以甲基 丙烯酸丁酯（BMA）、甲基丙烯酸十八酯（SMA）、苯乙烯（St）为单体，过氧化苯甲酰（BPO）为引发剂，聚乙烯醇 （PVA）为悬浮剂，用悬浮聚合的方法制备苯乙烯改性的聚丙烯酸酯自黏树脂。研究了苯乙烯加量对树脂结构、 热稳定性、油溶性、自黏性的影响，考察了树脂颗粒的封堵性能。结果表明，苯乙烯加量为40%时，树脂具有良好 的热稳定性，热分解温度为302.95 ℃，玻璃化转变温度为27.8 ℃；在130 ℃柴油中浸泡18 h后完全油溶，树脂的 黏度在110 ℃时取得最大值，约105 mPa·s。在模拟油藏条件下，自黏树脂的封堵压力梯度为1.27 MPa/m，表现出 较好的封堵效果。

In order to meet the sealing requirements of plugging agents under the conditions of unclear fracture scale，complex pore structure，high temperature and high mineralization reservoir in Tahe oilfield，the styrene-modified polyacrylate self-adhesive resin was prepared by suspension polymerization using butyl methacrylate（BMA），stearyl methyl acrylate（SMA）and styrene（St）as monomers，benzoyl peroxide（BPO）as initiator and polyvinyl alcohol（PVA）as suspending agent. The effects of styrene addition on the resin structure，thermal stability，oil solubility and self-adhesive property were investigated，and the plugging property of resin particle was examined. The results showed that the resin had good thermal stability with a thermal decomposition temperature of 302.95 ℃ and a glass transition temperature of 27.8 ℃ when the dosage of styrene was 40%. The resin was completely oil-soluble after soaking 18 hours in diesel oil at 130 ℃. The viscosity of the resin achieved a maximum value of about 105 mPa· s at 110 ℃. Under simulated reservoir condition，the self-adhesive resin exhibited a good sealing pressure gradient of 1.27 MPa/m.

10.19346/j.cnki.1000-4092.2021.02.014