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《断块油气田》[ISSN:1005-8907/CN:41-1219/TE]

卷:

期数:

2021年01

页码:

129-132，138

栏目:

钻采工艺

出版日期:

2021-01-25

文章信息/Info

Title:

Comparative study between alkali-free and alkali-containing chemical systems for recovering heavy oil

文章编号:

24

作者:

韩玉贵1; 丁名臣2; 刘义刚1; 邹剑1; 赵鹏1; 王业飞2

1.中海石油（中国）有限公司天津分公司渤海石油研究院，天津 300452；2.中国石油大学（华东）石油工程学院，山东 青岛 266580

Author(s):

HAN Yugui1;  DING Mingchen2;  LIU Yigang1;  ZOU Jian1;  ZHAO Peng1;  WANG Yefei2

1.Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300452, China; 2.College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China

关键词:

稠油; 提高采收率; 无碱体系; 含碱体系

Keywords:

heavy oil;  enhanced oil recovery;  alkali-free system;  alkali-containing system

分类号:

TE357.46

DOI:

10.6056/dkyqt202101024

文献标志码:

A

摘要:

稠油含碱体系化学驱能够显著提高采收率，但是碱的加入会带来结垢、采出液破乳难等问题，因此，人们逐渐考虑用无碱体系驱替稠油。当前关于2类体系驱替稠油特征和机理差异的研究较少，为了明确无碱和含碱化学体系驱替稠油差异，文中主要针对表面活性剂￣聚合物（SP）和碱￣聚合物（AP）体系开展了界面张力（IFT）、乳化性能和驱油特征研究。结果表明，SP和AP驱替稠油机理存在显著不同，即前者通过超低IFT形成油在水中乳化型（O/W）乳状液驱油，而后者与稠油没有达到超低IFT，形成水在油中乳化型（W/O）的乳状液。驱油结果表明，化学体系驱替稠油能力由强到弱依次为：AP、泡沫、SP、聚合物（P）、碱（A）、表面活性剂（S）。这说明：P的加入（扩大波及体积）是提高稠油采收率的前提，然后S和A才能充分发挥其超低IFT和乳化作用；气泡辅助的SP驱￣泡沫驱是当前无碱复合体系驱替稠油的较好的注入方式，是接替AP驱的重要技术；与泡沫驱相比，单一SP驱存在对化学药剂的潜在浪费。

Abstract:

The chemical flooding of heavy oil with alkali-containing system can significantly improve oil recovery, but the addition of alkali will lead to scaling and the difficulty of demulsification. Therefore, people gradually consider replacing it with alkali-free system, but there are few reports on the difference of characteristics and mechanism between those two systems. To clarify those differences between alkali-free and alkali-containing chemical systems in recovering heavy oil, the interfacial tension(IFT), emulsification behaviors and oil displacement characteristics of surfactant-polymer(SP) and alkali-polymer(AP) systems were experimentally studied. The results show that there are significant differences in the mechanism of heavy oil recovery between SP and AP: the former is mainly driven by ultra-low IFT and the formation of O/W emulsion, while the latter could hardly reach ultra-low IFT and mainly forms W/O emulsion. The recovery data proves that the ability of the chemical system to displace heavy oil from strong to weak is: AP, foam, SP, polyer, alkali, surfactant, which indicates that the sweep volume enlargement is the prerequisite for improving heavy oil recovery, then, the ultra-low IFT and emulsification mechanism can give full play; on the other hand, foam flooding is the best strategy for displacing heavy oil by the alkali-free systems, which is an important method to replace the AP method. Compared with the foam flooding, the single SP flooding has potential waste to the chemical agent.

参考文献/References:

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更新日期/Last Update: 2021-01-25