疏松砂岩油藏弱凝胶驱油井堵塞机制及技术对策

高建崇; 刘义刚; 卢祥国; 刘进祥; 何欣; 孟鑫郅; 王玉卿; 黄文静

doi:10.3969/j.issn.1006-6535.2025.06.017

特种油气藏 >

2025 , Vol. 32 >Issue 6: 141 - 149

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.06.017

钻采工程

疏松砂岩油藏弱凝胶驱油井堵塞机制及技术对策

高建崇 ,
刘义刚 ,
卢祥国 ,
刘进祥 ,
何欣 ,
孟鑫郅 ,
王玉卿 ,
黄文静

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1.东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆 163318;
2.中海石油中国有限公司天津分公司,天津 300451

高建崇(1979—),男,高级工程师,2003年毕业于西南石油学院石油工程专业,2024年毕业于东北石油大学油气田开发工程专业,获博士学位,现从事采油工程、增产增注措施和提高采收率技术研究管理工作。

收稿日期: 2025-06-17

修回日期: 2025-07-31

网络出版日期: 2025-12-31

基金资助

中海石油天津分公司重点科技攻关项目“多组分液固融合高效低成本油水井治水技术研究与应用服务”(202512919494)

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Plugging mechanism and technical countermeasures for weak gel flooding in unconsolidated sandstone reservoirs

GAO Jianchong ,
LIU Yigang ,
LU Xiangguo ,
LIU Jinxiang ,
HE Xin ,
MENG Xinzhi ,
WANG Yuqing ,
HUANG Wenjing

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1. Key Laboratory for Improving Oil and Gas Recovery Northeast Petroleum University,Ministry of Education, Daqing, Heilongjiang 163318, China;
2. CNOOC China Tianjin Company, Tianjin 300451, China

Received date: 2025-06-17

Revised date: 2025-07-31

Online published: 2025-12-31

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摘要

针对渤海L油田疏松砂岩油藏弱凝胶驱后期油井陆续发生堵塞的问题,开展了油井堵塞机理及解堵技术对策研究。结果表明:油井堵塞物中的水、原油重质组分、聚合物和无机物含量分别为63.99%、14.82%、14.48%和6.71%,无机物中CaCO₃、MgCO₃、SiO₂含量分别为60.00%、20.50%和13.00%,原油重质组分中烷烃、芳香烃、胶质、沥青质含量分别为13.78%、9.97%、32.84%、43.40%。海上平台空间狭小,使弱凝胶注入时大量未充分熟化的聚合物胶粒堆积筛管,后续缓慢熟化形成柔性胶冻体,运移中裹挟泥砂等形成多组分包裹体堵塞物,采出时受筛管和泵口作用再次堵塞。为解除现场堵塞优选出最佳解聚剂组合为“0.05%过硫酸钾+0.05%硫酸亚铁+0.10%柠檬酸”,有机溶剂组合为“30.00%柴油+20.00%二甲基亚砜+2.00%十二烷基硫酸钠+0.50%渗透剂”,溶垢剂组合为“10%盐酸+4%氢氟酸+1%缓蚀剂Lan826”。现场通过将解聚剂、有机溶剂和溶垢剂交替段塞式注入,有效解除了油井附近复合堵塞物,增液增油效果显著,日产液增幅为166.4%,日产油增幅为185.3%。该研究可为海上油田油井解堵提供借鉴。

关键词： 疏松砂岩; 弱凝胶驱; 堵塞物; 形成机理; 技术对策

本文引用格式

高建崇 , 刘义刚 , 卢祥国 , 刘进祥 , 何欣 , 孟鑫郅 , 王玉卿 , 黄文静 . 疏松砂岩油藏弱凝胶驱油井堵塞机制及技术对策[J]. 特种油气藏, 2025 , 32(6) : 141 -149 . DOI: 10.3969/j.issn.1006-6535.2025.06.017

Abstract

Aiming at the problem of successive plugging in oil wells during the late stage of weak gel flooding in the unconsolidated sandstone reservoir of Bohai L Oilfield, research on the plugging mechanism and plug removal technical countermeasures for weak gel flooding oil wells in this reservoir was carried out. The results indicate that the plugging material in oil wells consists of water, heavy components of crude oil, polymer and inorganic matter with contents of 63.99%, 14.82%, 14.48% and 6.71% respectively. Among the inorganic matter, the contents of CaCO₃, MgCO₃ and SiO₂ are 60.00%, 20.50% and 13.00% respectively.Among the heavy components of crude oil, the contents of alkanes, aromatic hydrocarbons, resins and asphaltenes are 13.78%, 9.97%, 32.84%, and 43.40% respectively. The limited space on offshore platforms causes a large amount of insufficiently matured polymer gel particles to accumulate on the screen during weak gel injection. These particles subsequently mature slowly to form flexible gel bodies, which entrain mud and sand during migration to form multi-component encapsulated plugging material. During production, they cause plugging again due to the constraints of the screen and pump inlets. To remove on-site plugging, the best depolymerizer combination "0.05% potassium persulfate + 0.05% ferrous sulfate + 0.10% citric acid", organic solvent combination "30.00% diesel oil + 20.00% dimethyl sulfoxide + 2.00% sodium dodecyl sulfate + 0.50% penetrant" and scale dissolver combination "10% hydrochloric acid + 4% hydrofluoric acid + 1% corrosion inhibitor Lan826" were preferentially selected. On site, by alternately injecting slugs of depolymerizer, organic solvent, and scale dissolver, the composite plugging material near the oil well was effectively removed, with significant liquid and oil increase performance. The daily liquid production increased by 166.4%, and the daily oil production increased by 185.3%. This research can provide reference for oil well plug removal in offshore oilfields.

Key words： unconsolidated sandstone; weak gel flooding; plugging material; formation mechanism; technical countermeasures

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