| 摘要: |
| 目的 针对传统聚合物堵水凝胶在高温高盐环境下难以适应的问题，以苯基丙烷结构的木质素为原料，经胺化改性和交联固化制备一种耐温耐盐的堵水凝胶。方法 考查了木质胺化改性程度、交联剂用量、木质素胺含量、固化温度对凝胶物理强度的影响；评价了木质素胺堵水凝胶的耐老化性能，并进行了现场堵水应用实验。结果 木质素与胺质量比为1∶2时，聚乙二醇二缩水甘油醚用量为20%（w），木质素胺质量分数为15%，温度150 ℃时，固化时间为5 h；固化后胶块经21×104 mg/L矿化度盐水老化90天后压缩应力为597 kPa，凝胶的体积保留率为89.7%。现场应用结果显示，在最优配比将木质素胺堵水体系注入140 ℃和矿化度为21×104 mg/L的地层环境中，采油含水率由注入前99.0%降低至58.5%，日产原油量最高为13.8 t，有效作用时间能够达到90天。结论 作为废弃物的木质素经改性后在高温高盐油田具有潜在的应用前景。 |
| 关键词: 木质素 胺化改性 聚乙二醇二缩水甘油醚 油田堵水剂 耐温耐盐性 |
| DOI：10.3969/j.issn.1007-3426.2025.02.014 |
| 分类号: |
| 基金项目:采油用调堵材料研究与应用?耐170 ℃超高温有机堵剂研发与应用项目（34400007-22-ZC0613-0016） |
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| Preparation and application of temperature and salt-resistant water-plugging gel based on amine-modified lignin |
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Zhi KANG1,2, Qingjie MA1,2, Shao GENG3,4, Xin SHI1,2, Shenglin LI1,2, Keyan WANG3, Yangbing WEN3
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1.Northwest Oilfield Branch Company, Sinopec, Urumqi, Xinjiang, China;2.Key Laboratory for Enhanced Oil Recovery of Fractured and Caved Reservoirs, Sinopec, Urumqi, Xinjiang, China;3.Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin, China;4.China Light Industry Construction Co., Ltd., Beijing, China
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| Abstract: |
| Objective In order to solve the problem that traditional polymer water plugging gel is difficult to adapt to high temperature and high salt environment, a temperature and salt-resistant water-plugging gel is prepared from phenylpropane lignin by amination modification and crosslinking curing. Method The effects of amination modification degree of lignin, amount of crosslinking agent, the content of lignin amine and curing temperature on the physical strength of the gel were investigated; the aging-resistance of lignin amine water-plugging gel was evaluated, and the water-plugging application experiment was carried out in the field. Result The results showed that when the mass ratio of lignin to amine was 1∶2, the dosage of polyethylene glycol diglycidyl ether (PEGDGE) was 20 wt%, content of lignin amine was 15 wt% and the temperature was 150 ℃, the curing time was 5 h; the compression stress of cured gel block was 597 kPa after aging for 90 days with 210×103 mg/L mineralized salt water, and the volume retention rate of gel was 89.7%. The on-site application results showed that when the lignin amine water-plugging system with optimal ratio was injected into the formation environment with 140 ℃ and 210×103 mg/L mineralization, the water content of the oil recovery decreased from 99.0% before injection to 58.5% after injection, and the maximum daily crude oil production was 13.8 t. The adequate action time could reach 90 days. Conclusion As a waste material, lignin has potential application prospects in high-temperature and high-salt oil fields after modification. |
| Key words: lignin amination modification polyethylene glycol diglycidyl ether (PEGDGE) water plugging agent temperature and salt-resistance |
