CO2驱气溶性降混剂提高采收率机理实验

孙大龙; 张广东; 彭旭; 敬豪; 吕华; 任超峰; 王宁

doi:10.3969/j.issn.1006-6535.2022.01.020

特种油气藏 >

2022 , Vol. 29 >Issue 1: 134 - 140

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.01.020

油藏工程

CO₂驱气溶性降混剂提高采收率机理实验

孙大龙 ,
张广东 ,
彭旭 ,
敬豪 ,
吕华 ,
任超峰 ,
王宁

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1.西南石油大学,四川成都 610500;
2.四川省科源工程技术测试中心,四川成都 610091;
3.中国石油长庆油田分公司,陕西靖边 718500;
4.中国石油长庆油田分公司,陕西西安 710000

孙大龙(1996—),男,2018年毕业于西南石油大学石油工程专业,2021年毕业于该校油气田开发工程专业,现主要从事储层保护方向研究工作。

收稿日期: 2020-05-11

修回日期: 2021-11-04

网络出版日期: 2023-01-10

基金资助

国家青年科学基金项目“基于多场耦合的二氧化碳驱油机理研究”(51904252)

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Experiment on the Mechanism of Enhancing Oil Recovery by CO₂ Flooding with Gas-soluble Demixing Agent

Sun Dalong ,
Zhang Guangdong ,
Peng Xu ,
Jing Hao ,
Lyu Hua ,
Ren Chaofeng ,
Wang Ning

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1. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Keyuan Engineering Technology Testing Center of Sichuan Province, Chengdu, Sichuan 610091, China;
3. PetroChina Changqing Oilfield Company, Jingbian, Shaanxi 718500, China;
4. PetroChina Changqing Oilfield Company, Xi′an, Shaanxi 710000, China

Received date: 2020-05-11

Revised date: 2021-11-04

Online published: 2023-01-10

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摘要

针对CO₂驱气溶性降混剂降低混相压力、提高采收率机理认识不清的问题,综合利用室内实验、数值模拟和权重分析法,通过分析原油组分、原油黏度、油气界面张力、原油相态特征的变化,明确了气溶性降混剂的降混机理。实验结果表明:注入体积分数为3%和20%的气溶性降混剂后,原油重质组分含量分别减少25.07%和48.21%,平均原油黏度分别降低61.51%和96.88%,相同压力下的原油与CO₂界面张力分别降低30.36%和91.16%,饱和压力分别降低6.22%和15.90%;气溶性降混剂的主要降混机理为裂解原油的重质组分、降低原油的黏度和降低油气界面张力。对气溶性降混剂与CO₂混合注入和段塞注入2种方式的提高采收率驱油机理进行了分析,明确了地层中不同波及区域的渗流特征:混合带区域主要为CO₂或气溶性降混剂与地层原油的两相渗流,混相带区域主要为CO₂、气溶性降混剂与地层原油的三相渗流。该研究为CO₂驱气溶性降混剂优化和矿场实践提供了依据。

关键词： 气溶性降混剂; CO₂驱; 提高采收率; 渗流特征; 机理

本文引用格式

孙大龙 , 张广东 , 彭旭 , 敬豪 , 吕华 , 任超峰 , 王宁 . CO₂驱气溶性降混剂提高采收率机理实验[J]. 特种油气藏, 2022 , 29(1) : 134 -140 . DOI: 10.3969/j.issn.1006-6535.2022.01.020

Abstract

In view of unclear understanding of the mechanism of reducing mixed-phase pressure and enhancing oil recovery by CO₂ flooding with soluble demixing agent, the demixing mechanism of gas-soluble demixing agent was clarified by analyzing the changes in crude oil composition, crude oil viscosity, oil-gas interfacial tension and crude oil phase characteristics in combination with laboratory experiment, numerical simulation and weight analysis. The experimental results showed that after injecting the gas-soluble demixing agents of 3% and 20% volume fraction, the content of heavy components in crude oil was reduced by 25.07% and 48.21%, the average crude oil viscosity reduced by 61.51% and 96.88%, the interfacial tension between crude oil and CO₂ reduced by 30.36% and 91.16% at the same pressure, and the saturation pressure reduced by 6.22% and 15.90%, respectively. The dominant demixing mechanism of gas-soluble demixing agent was to crack the heavy components of crude oil, reduce the crude oil viscosity and decrease the oil-gas interfacial tension. The study also analyzed the oil displacement mechanism for oil recovery enhancement by mixed injection and plug injection of gas-soluble demixing agent and CO₂, and clarified the seepage characteristics of different affected areas in the formation, namely there was two-phase seepage of CO₂ or gas-soluble demixing agent and formation crude oil in the mixed injection area, and three-phase seepage of CO₂, gas-soluble demixing agent and formation crude oil in the mixed-phased area. This study provides a basis for the optimization and field practice of the gas-soluble demixing agent for CO₂ flooding.

Key words： gas-soluble demixing agent; CO₂ flooding; enhance oil recovery; seepage characteristics; mechanism

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