一种耐高温调堵剂的制备与应用

Preparation and Application of a High Temperature Resistant Plugging Agent

姚大伟 张磊

YAO Dawei ZHANG Lei

为解决高渗透油藏高含水开发阶段后期油藏温度高、注采不平衡、层内层间矛盾突出等问题，以高黏弹性 凝胶干粉为主剂，并加入一定量的乌洛托品、氢氧化钠、吸水膨胀型颗粒封堵剂以及单向压力封闭剂，制得一种 耐高温高黏弹性调堵剂，并评价了该调堵剂的成胶性能、热稳定性能、封堵性能及与CO2的配伍性，并报道了现 场应用情况。该调堵剂的优化配方为：2%高黏弹性凝胶干粉+4%颗粒封堵剂+4%单项压力封闭剂+0.9%乌洛托 品+1.0%氢氧化钠。该调堵剂在室温下不成胶，可被顺利泵入地层，保证施工安全。调堵剂在120、150 ℃条件下 养护后，成胶时间分别为492、286 min，成胶黏度分别为11 806、11 250 mPa·s，形成了高黏弹性半固态凝胶体。 该调堵剂耐温可达150 ℃以上，具有良好承压能力和选择性封堵能力，能够实现定位封堵，有效控制油藏优势水 流通道，改善吸水剖面。该调堵剂在现场应用效果明显，L90-58 井浅调剖见效后，对应油井平均日产油提高3.38 t，含水下降19.15%，取得较好的降水增油效果。

Aiming at the problems of high reservoir temperature， unbalanced injection and production， and prominent contradictions between layers in the late development stage of high water-cut oil reservoirs in medium and high permeability reservoirs，a high temperature resistant and high viscosity elastic profile control and plugging agent was prepared by taking high viscoelasticity gel powder as the main agent，adding a certain amount of urotropine，sodium hydroxide，water swelling granular plugging agent and one-way pressure sealing agent. The gelling performance，thermal stability，plugging performance and compatibility with CO2 of the profile control and plugging agent were evaluated，and the field application was mentioned. The optimized formula of the plugging agent was as follows：2% high viscoelastic gel powder+4% granular plugging agent+4% single pressure sealing agent+0.9% urotropine+1.0% sodium hydroxide. The plugging agent could not form a gel at room temperature and could be smoothly pumped into the formation to ensure construction safety. After curing at the temperature of 120℃ and 150℃，the gelling time of the plugging agent was 492 min and 286 min，respectively，and the gelling viscosity was 11806 mPa·s and 11250 mPa·s，respectively，resulting in forming a high viscoelastic semi-solid gel. The plugging agent had a temperature resistance of above 150 ℃ ，good pressure bearing capacity and selectivity，and could achieve targeted plugging，effectively control the dominant water flow channel of the reservoir，and improve the water absorption profile. The plugging agent had a significant effect in on-site application. After the shallow profile control of L90-58 well，the average daily oil production of the corresponding oil well increased by 3.38 t，and the water content decreased by 19.15%，achieving good water control and oil increase effects.

10.19346/j.cnki.1000-4092.2023.03.006