聚驱油田复合高效解堵体系研究

刘毅龙; 齐宁; 甘俊冲; 申玉洋; 张振军; 石向轲

doi:10.12358/j.issn.1001-5620.2023.05.020

聚驱油田复合高效解堵体系研究

doi: 10.12358/j.issn.1001-5620.2023.05.020

1.
中国海洋石油国际有限公司海外技术支持中心，北京 100028
2.
中国石油大学(华东)石油工程学院, 山东青岛266580

基金项目: 十三五重大专项“碳酸盐岩复合深度改造优化设计方法及配套技术研究”（2017ZX05030005-002-003）；山东省自然科学基金“基于蚓孔竞争机制的自转向酸酸蚀蚓孔描述及动态酸化模拟研究”（ZR201702180073）。

详细信息

作者简介:
刘毅龙，1998年生，毕业于中国石油大学（华东）石油工程学院，现在从事海外油田开发生产研究工作。电话（010）89912426；E-mail：lylong929@163.com。

通讯作者:
齐宁，中国石油大学（华东）教授，从事采油工程与提高采收率的研究工作。E-mail：qining@upc.edu.cn。

中图分类号: TE39
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出版历程
- 收稿日期: 2023-05-10
- 修回日期: 2023-07-20
- 刊出日期: 2023-12-25

Compound and Efficient Blockage-Removal Agent for Polymer Flooding Oilfield

1.
Overseas Technical Support Center，CNOOC International Limited，Beijing 100028
2.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580

摘要

摘要: 针对聚驱油田长期注聚后形成聚合物、无机垢、稠油相互包裹的复杂堵塞物，导致地层严重堵塞的问题。以过碳酰胺为聚合物降解剂，乙酸为无机垢溶蚀剂，辛基酚聚氧乙烯醚10（OP-10）为原油清洗剂，辅以稳定剂以及缓蚀剂，形成稳定、高效的复合解堵体系。确定配方为0.6%过碳酰胺+3%乙酸+0.3%OP-10+1%二乙烯三胺五甲叉膦酸（DTPMP）+1%HSJ-3，并对体系的解堵性能、稳定性能、耐温性能以及耐矿化度性能进行评价。结果表明：在不同温度条件下，复合解堵体系均能对模拟堵塞物有效降解，80 ℃下4 h即可达到90%以上降解率，具有优良的解堵性能及耐温性能；80 ℃下放置1 h，稳定度保持在97%，具有良好的稳定性能；腐蚀速率为0.9871 g·m⁻²·h⁻¹，达到行业一级标准；用15×10⁴ mg/L高矿化度的盐水配制后，解堵效率基本无影响，耐矿化度性能优良。注入复合解堵体系后，岩心渗透率由0.244×10⁻³ μm²提高至6.391×10⁻³ μm²，渗透率提高倍数达25.192。复合解堵体系可有效地解决聚驱过程中形成的复杂堵塞物。
- 聚驱油田 /
- 复杂堵塞物 /
- 过碳酰胺 /
- 复合体系
Abstract: Aiming at the problem of complex blockages in which polymers, inorganic scales and heavy oils are wrapped around each other after long-term polymer injection in the polymer flooding oilfield, resulting in serious blockage of the formation, a stable and efficient compound blockage-removal agent with 0.6% percarbonamide, 1% acetic acid, 0.3% OP-10, 1%DTPMP, and 1%HSJ-3 was prepared. And the properties of the compound blockage-removal agent were evaluated. The results showed that the agent can effectively degrade the simulated blockages under different temperature conditions. Under the condition of 80 ℃, the degradation rate of more than 90% can be reached in 4 h, with excellent degradation performance and temperature resistance. Placed at 80 ℃ for 1 h, the stability was maintained at 97%, with good stability performance and the corrosion rate was 0.9871 g·m⁻²·h⁻¹, which met the industry-level standard. When prepared with 15×10⁴ mg/L high salinity brine, the blockage-removal efficiency was basically not affected and the salinity resistance is excellent. The compound blockage removal agent can effectively solve the complex blockages formed in the process of polymer flooding through gradual stripping and continuous degradation. After injecting the composite blockage-removal agent, the core permeability increased from 0.244×10⁻³ μm² to 6.391×10⁻³ μm², and the permeability increased by a factor of 25.192. The compound block-removal agent can effectively solve the complex blockages.
- Polymer flooding oilfield /
- Complex blockages /
- Percarbamide /
- Compound agent

HTML全文

图 1 不同氧化物降解率随降解时间的变化

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图 2 过碳酰胺降解聚合物前后扫描电镜图

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图 3 不同质量分数酸液对CaCO₃溶蚀能力

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图 4 不同质量分数酸液反应速率

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图 5 过碳酰胺质量分数对复合解堵体系解堵效果的影响

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图 6 OP-10质量分数对复合解堵体系解堵效果的影响

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图 7 酸液质量分数对复合解堵体系解堵效果的影响

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图 8 稳定剂对过碳酰胺溶液稳定性的影响

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图 9 复合解堵体系对模拟复合堵塞物的降解时间随温度的变化

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图 10 降解率随矿化度的变化

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图 11 注入聚合物与无机垢复合堵塞物岩心堵塞过程

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图 12 注入聚合物与无机垢复合堵塞物岩心解堵过程

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表 1 不同表面活性剂水溶液与原油界面张力

表面活性剂类型	界面张力/(mN ·m⁻¹)
去离子水	35.806
辛基酚聚氧乙烯醚10（OP-10）	0.6718
N-月桂酰基氨酸钠（SNS）	1.1152
聚氧乙烯十二烷基醚硫酸钠（SLES）	1.4230
α-烯基磺酸钠（AOS）	2.0181
十二烷基苯磺酸钠（SDBS）	2.2979
吐温80	4.0202

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表 2 正交实验设计表

水平	因素
水平	过碳酰胺/%	OP-10/%	酸液/%
1	0.3	0.2	1
2	0.4	0.3	2
3	0.5	0.4	3
4	0.6	0.5	4

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表 3 缓蚀剂在解堵体系中缓蚀能力测量结果

T/℃	t/h	缓蚀剂	失重/g	腐蚀速率/（g·m⁻²·h⁻¹）	缓蚀率/%
80	4	未添加	0.0675	12.4026
		HSJ-1	0.0265	4.8640	60.800
		HSJ-2	0.0114	2.0956	83.111
		HSJ-3	0.0054	0.9871	92.045

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