基于裂缝径向流物理模型的CO2驱注入方式研究

石立华; 王维波; 王成俊; 陈龙龙

doi:10.3969/j.issn.1006-6535.2021.03.017

特种油气藏 >

2021 , Vol. 28 >Issue 3: 112 - 117

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.03.017

油藏工程

基于裂缝径向流物理模型的CO₂驱注入方式研究

石立华 ,
王维波 ,
王成俊 ,
陈龙龙

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1.中国石油大学(北京),北京 102249;
2.陕西省特低渗透油气勘探开发工程技术研究中心,陕西西安 710065;
3.陕西延长石油(集团)有限责任公司,陕西西安 710065;
4.西安石油大学,陕西西安 710065

石立华(1983—),男,高级工程师,2007年毕业于长江大学石油工程专业,现为中国石油大学(北京)油气田开发工程专业在读博士研究生,主要从事油藏工程、油气田开发理论与方法研究工作。

收稿日期: 2020-06-17

修回日期: 2021-03-21

网络出版日期: 2022-02-16

基金资助

陕西省科技统筹创新项目“延长难采储量有效动用开发技术研究”(2016KTCL01-12)

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Study on Injection Mode of CO₂ Flooding Based on Physical Model of Fracture Radial Flow

Shi Lihua ,
Wang Weibo ,
Wang Chengjun ,
Chen Longlong

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1. China University of Petroleum (Beijing), Beijing 102249, China;
2. Shaanxi Engineering Technology Research Center for Exploration and Development of Extra-Low Permeability Oil and Gas Fields, Xi'an, Shaanxi 710065, China;
3. Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an, Shaanxi 710065, China;
4. Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

Received date: 2020-06-17

Revised date: 2021-03-21

Online published: 2022-02-16

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摘要

针对水驱后CO₂驱不同注入方式优选问题,基于裂缝径向流物理模型,开展一注四采五点法井网单一裂缝和复杂裂缝CO₂复合驱油室内实验,研究了低渗透裂缝性油藏水驱后不同注入工艺下CO₂驱效果。结果表明:单一裂缝模型水驱后,依次实施CO₂连续气驱、改性淀粉凝胶注入、乙二胺注入等不同注入工艺,油藏阶段采出程度呈现先增加后降低的趋势,最终可在单一水驱基础上提高采收率65.7个百分点;复杂裂缝模型水驱后,依次实施CO₂连续气驱、改性淀粉凝胶注入、乙二胺注入、水气交替等不同注入工艺,水气交替驱油效果最好,最终可在单一水驱基础上提高采收率28.89个百分点。研究成果对低渗透裂缝性油藏水驱后CO₂驱具有重要指导意义。

关键词： 低渗; 裂缝; 物理模拟; CO₂驱; 气窜; 水气交替; 改性淀粉凝胶

本文引用格式

石立华 , 王维波 , 王成俊 , 陈龙龙 . 基于裂缝径向流物理模型的CO₂驱注入方式研究[J]. 特种油气藏, 2021 , 28(3) : 112 -117 . DOI: 10.3969/j.issn.1006-6535.2021.03.017

Abstract

Aiming at the optimization of different injection methods of CO₂ flooding after water flooding, based on the physical model of fracture radial flow, indoor experiment was conducted on CO₂ compound flooding in single fracture and complex fracture in five-spot well pattern (one well in injection and four other wells in production) to study the effect of CO₂ flooding with different injection processes after water flooding in low-permeability fractured reservoir. The results showed that: after the water flooding of the single fracture model, different injection processes, such as continuous CO₂ flooding, modified starch gel injection and ethylenediamine injection, were implemented successively, the recovery percent of the reservoir increased firstly and then decreased, and finally the recovery efficiency could be increased by 65.7% on the basis of the single-fracture water flooding; after water flooding of complex fracture model, different injection processes, different injection processes such as continuous CO₂ flooding, modified starch gel injection, ethylenediamine injection and water alternate gas, were implemented successively; the effect of water alternate gas on improving CO₂ flooding effect was the best and the recovery efficiency could be increased by 28.89% on the basis of single-fracture water flooding. The study results play a guiding role in CO₂ flooding after water flooding in low-permeability fractured reservoirs.

Key words： low permeability; fractures; physical simulation; CO₂ flooding; gas channeling; water and gas alternation; modified starch gel

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