β-环糊精对油田两亲聚合物类堵塞物的解堵机理
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国家自然科学基金资助项目“低浓度两亲聚合物驱油体系增效方法与机理研究”(项目编号51774309)


Unblocking Mechanism of β-cyclodextrin on Amphiphilic Polymer Pluggings
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    摘要:

    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。

    Abstract:

    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.

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邹 剑,陈 磊,刘长龙,高 尚,张丽平,杨红斌.β-环糊精对油田两亲聚合物类堵塞物的解堵机理[J].油田化学,2019,36(3):440-443.
ZOU Jian, CHEN Lei, LIU Changlong, GAO Shang, ZHANG Liping, YANG Hongbin. Unblocking Mechanism of β-cyclodextrin on Amphiphilic Polymer Pluggings[J]. OILFIELD CHEMISTRY,2019,36(3):440-443.

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  • 在线发布日期: 2019-10-11
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