聚氨酯型调堵剂的合成与应用研究
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1.中石化胜利油田博士后工作站;2.江南大学 化工与材料工程学院;3.中国石化胜利油田分公司;4.中石化胜利油田石油工程技术研究院

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中石化新领域培育项目(P24113),国家自然科学基金(22072058,21503094) ,东营市自然科学基金(240321),中石化胜利油田博士后项目(YKB2107)


Research on the synthesis and application of polyurethane plugging agent
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    摘要:

    调堵剂在石油开发、提质增效过程中发挥关键作用,但存在封堵强度不足、有效期短、堵水效率低等问题,因此开展高强度调堵体系研究成为热点。本论文开发了一类有机交联凝胶类调堵剂,以聚羟乙基丙烯酰胺(PHEAA)为骨架分子,1,6-己二异氰酸酯(HDI)为交联剂,N,N-二甲基甲酰胺(DMF)和二甲基亚砜(DMSO)混合溶液为溶剂,成功构建了可以发生sol-gel相态转变的有机调堵体系(ADI)。系统考察了聚合物、HDI等组分含量及温度对固化时间以及凝胶强度的影响。结果表明,固化后有机凝胶强度与聚合物及交联剂浓度成正比,固化时间与温度成反比。PHEAA及HDI含量分别从10%、2%增加至16%、5%时,固化后弹性模量从991增加至3100 Pa,固化后粘度从22400 增加至45100 mPa.s;环境温度从45升温至125℃,固化时间从3 h骤降至13 min。体系固化转变主要归因于HDI与PHEAA中羟基之间的亲核反应。人造岩心封堵实验证实,当液相封堵体系注入1 PV时,固化后封堵压力最高可达26.11 MPa,明确了该体系堵水调剖的潜在应用价值。

    Abstract:

    Plugging agent plays a key role in the process of oil development, quality improvement and efficiency enhancement. However, there are some problems such as insufficient plugging strength, short validity period and low water plugging efficiency. Therefore, the research on high-strength plugging system has become areas of research focus. In this paper, a kind of organic cross-linked gel plugging agent was developed. With polyhydroxyethylacrylamide (PHEAA) as the skeleton molecule, 1,6-hexane diisocyanate ( HDI ) as the crosslinking agent, N, N-dimethylformamide ( DMF ) and dimethyl sulfoxide(DMSO)mixed solution as the solvent, an organic plugging system ( ADI ) that can undergo sol-gel phase transition under constant temperature conditions was successfully constructed. The influence of polymer, ( HDI ) content and temperature on the gelation time and gel strength were systematically investigated. The results demonstrate that the strength of the gelled organic gel is proportional to the concentration of the polymer and the concentration of the crosslinking agent, and the gelation time is adversely proportional to the temperature. While the content of PHEAA and HDI increased from 10%, 2% to 16%, 5 %, respectively, the corresponding elastic modulus increased from 991 to 3100Pa, and the viscosity increased from 22400 to 45100 mPa.s, separately. Accompanied with the ambient temperature increased from 45 °C to 125 °C, the gelation time decreased from 3h to 13min. The solid-state transition of the system is mainly attributed to the nucleophilic reaction between HDI and hydroxyl groups in PHEAA. The artificial core plugging experiment confirmed that when the volume of liquid plugging system injected to the core reached to 1 PV, the plugging strength after solidifing could reach up to 26.11 MPa, illustrating the potential application for water plugging and profile control.

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  • 收稿日期: 2024-10-31
  • 最后修改日期: 2024-11-25
  • 录用日期: 2024-12-11
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