β-环糊精对油田两亲聚合物类堵塞物的解堵机理

Unblocking Mechanism of β-cyclodextrin on Amphiphilic Polymer Pluggings

邹 剑 陈 磊 刘长龙 高 尚 张丽平 杨红斌

ZOU Jian CHEN Lei LIU Changlong GAO Shang ZHANG Liping YANG Hongbin

针对渤海油田S区块长期注两亲聚合物导致的堵塞问题，提出了一种安全高效的β-环糊精（β-CD）解堵体系，通过黏度法和失重法研究了β-CD对现场聚合物和堵塞物的解堵效果及机理，并采用填砂管解堵实验验证了解堵体系的解堵性能。研究结果表明，随着β-CD浓度增加，β-CD对油田两亲聚合物溶液的降黏率逐渐升高，当 β-CD质量浓度为1.0 g/L时，降黏率达70%；在加入洗油剂后，β-CD对两种含油现场堵塞物的静态解堵效果大幅提升，对X-2和X-18井堵塞物的解堵率分别可达75.92%和66.29%，填砂管解堵率达64.37%。β-CD对两亲聚合物的疏水基团具有竞争包合作用，能破坏聚合物分子的空间网络结构，可用作绿色安全解堵剂。

Aiming at the blocking problem caused by the long-term injection of amphiphilic polymer in the S-block of Bohai Oilfield，an efficient and safe plugging removal system based on beta-cyclodextrin（β-CD）was proposed，the viscosity method and weight loss method were used to study the viscosity reduction effect of β-CD on amphiphilic polymers and plugging，and the plugging model of sand-filled tubes was used to further evaluate its removal effect. The results showed that with the increase of concentration，the viscosity reduction rate of β-CD on oilfield polymers was gradually increased. When the concentration of β-CD was 1.0 g/L，the viscosity reduction rate was 70%. After adding the oil-washing agent，the blocking removal effect of β-CD on X-2and X-18 well field blockage was greatly improved，and the blocking removal rate could reach up to 75.92% and 66.29%，respectively，and the removal rate of sand filled pipe reached up to 64.37% . β-CD had a competitive inclusion effect on the hydrophobic group of amphiphilic polymer，which could destroy the spatial network structure of polymer molecules，as a result，it could be used as a safety degrading agent.

10.19346/j.cnki.1000-4092.2019.03.011