致密油藏CO2吞吐参数优化数值模拟研究

宋保建; 李景全; 孙宜丽; 张薇; 刘鹏

doi:10.3969/j.issn.1006-6535.2023.04.014

特种油气藏 >

2023 , Vol. 30 >Issue 4: 113 - 121

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.04.014

油藏工程

致密油藏CO₂吞吐参数优化数值模拟研究

宋保建 ,
李景全 ,
孙宜丽 ,
张薇 ,
刘鹏

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1.中国石化河南油田分公司,河南南阳 474780;
2.中国石油大学华东,山东青岛 266580

宋保建(1978—),男,高级工程师,2000年毕业于石油大学(北京)石油工程专业,2015年毕业于中国石油大学(北京)油气储运工程专业,获博士学位,现主要从事油气田开发工程的研究与管理工作。

收稿日期: 2022-11-05

修回日期: 2023-04-06

网络出版日期: 2023-09-18

基金资助

中国石化科技重大专项“渭北超低渗低压油藏改善开发效果对策研究”(P18078)

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Numerical Simulation Study on Parameters Optimization of CO₂ Huff-n-puffin Tight Reservoir

Song Baojian ,
Li Jingquan ,
Sun Yili ,
Zhang Wei ,
Liu Peng

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1. Sinopec Henan Oilfield Branch, Nanyang, Henan 474780, China;
2. China University of Petroleum (East China), Qingdao, Shandong 266580, China

Received date: 2022-11-05

Revised date: 2023-04-06

Online published: 2023-09-18

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摘要

为提高致密油藏压裂后油井开发效果,基于河南油田ZD区块,通过压裂裂缝变导流物理实验确定基质及裂缝的渗透率-应力敏感性关系,应用数值模拟方法,确定致密油藏不同储层CO₂吞吐参数最优值。结果表明:在注入和闷井阶段,CO₂波及范围越来越大,波及范围内原油黏度明显降低,生产阶段CO₂随原油产出,动用范围较大;换油率随CO₂注入量或闷井时间的增加均呈现先上升后降低趋势,与CO₂注入速率呈正相关性,与吞吐周期呈负相关性;储层物性越好,最佳CO₂注入量及注入速度越低,最佳闷井时间越短,吞吐周期越多。在四类储层的ZA4121井开展CO₂吞吐试验,累计增油量为303.4 t,取得较好开发效果,换油率为0.16 t/t。研究成果可为致密油藏压裂后CO₂吞吐相关研究与应用提供参考。

关键词： 致密油藏; 压裂; CO₂吞吐; 数值模拟; 参数优化

本文引用格式

宋保建 , 李景全 , 孙宜丽 , 张薇 , 刘鹏 . 致密油藏CO₂吞吐参数优化数值模拟研究[J]. 特种油气藏, 2023 , 30(4) : 113 -121 . DOI: 10.3969/j.issn.1006-6535.2023.04.014

Abstract

To improve the development effect of oil wells after fracturing in tight reservoirs, based on the Block ZD of Henan Oilfield, the permeability-stress sensitivity relationship of matrix and fracture was determined by fracture-variable-conductivity physical experiments, and the numerical simulation was applied, to determine the optimal values of CO₂ huff-n-puff parameters in different reservoirs of tight oil reservoirs. The result shows that in the injection and shut-in stages, the affected area of CO₂ is getting wider and wider, the crude oil viscosity in the affected area decreases significantly, and the CO₂ is produced with the crude oil in the production stage, and the range of production is larger; the oil exchange rate increases and then decreases with the increase of CO₂ injection volume or shut-in time, which is positively correlated with the CO₂ injection rate and negatively correlated with the huff-n-puff period; the better the reservoir physical properties, the lower the optimal CO₂ injection volume and injection rate, and the shorter the optimal shut-in time and the longer huff-n-puff cycles. The CO₂ huff-n-puff test was carried out in Well ZA4121 in four types of reservoirs, and the accumulated oil increment was 303.4 t, which achieved a good development effect with an oil exchange rate of 0.16 t/t. The research results can provide reference for the study and application related to CO₂ huff-n-puff after fracturing in tight reservoirs.

Key words： tight reservoir; fracturing; CO₂ huff-n-puff; numerical simulation; parameter optimization

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