油气藏评价与开发 >
2024 , Vol. 14 >Issue 1: 83 - 90
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2024.01.012
吉木萨尔页岩油井区CO2前置压裂工艺参数优化及现场实践
收稿日期: 2023-01-09
网络出版日期: 2024-03-05
基金资助
中国石油重大科技专项“陆相页岩油规模增储上产与勘探开发技术研究”(2023ZZ15)
Parameter optimization and field practice of CO2 pre-fracturing process in Jimsar shale oil block
Received date: 2023-01-09
Online published: 2024-03-05
吉木萨尔凹陷芦草沟组页岩油具有原始渗透率极低，原油黏度高等特点，自然条件下无经济产能。通过现场实践，证明密切割+高强度体积压裂，是实现页岩油规模开发的最有效手段之一，但现阶段如何延缓油井递减率，提高单井采收率仍是亟待解决的问题。2019—2022年，在吉木萨尔页岩油区块，开展了CO2前置压裂辅助提产技术研究和现场试验，系统地研究分析CO2前置蓄能压裂和CO2吞吐在吉木萨尔页岩油区块的应用效果。结果表明，超临界态CO2具有混相增能、溶蚀改善储层条件、提高渗吸置换效率、提高缝网复杂程度等作用，并明确最优注入量、注入速度、注入方式等关键工艺参数，初步形成了一套页岩油藏CO2前置压裂的工艺技术体系。根据生产数据预测，CO2前置压裂工艺可将最终采收率提升20%左右，对实现页岩油效益开发，为其他类型页岩油藏提高开发效果提供参考。
赵坤 , 李泽阳 , 刘娟丽 , 胡可 , 江冉冉 , 王伟祥 , 刘秀珍 . 吉木萨尔页岩油井区CO2前置压裂工艺参数优化及现场实践[J]. 油气藏评价与开发, 2024 , 14(1) : 83 -90 . DOI: 10.13809/j.cnki.cn32-1825/te.2024.01.012
The shale oil of Lucaogou Formation in Jimsar Sag has the characteristics of extremely low original permeability and high viscosity of crude oil, making it uneconomical to produce under natural conditions. Field practices have demonstrated that dense drilling combined with high-intensity volume fracturing is one of the most effective means to achieve large-scale development of shale oil. However, how to slow down the decline rate of oil wells and improve the recovery rate per well remains a pressing issue to be addressed. From 2019 to 2022, the researches and field tests of CO2 pre-fracturing assisted production technology were carried out in Jimsar shale oil block. The application effect of CO2 pre-storage fracturing and CO2 huff and puff in Jimsar shale oil block was systematically studied and analyzed. The results indicate that supercritical CO2 has the effects of miscible energy increase, dissolution to improve reservoir conditions, improve imbibition replacement efficiency, and increase the complexity of fracture network. The optimal injection volume, injection speed, and injection methods were determined, and a preliminary technological system for CO2 pre-fracturing in shale oil reservoirs was established. According to the prediction of production data, the CO2 pre-fracturing process can increase the final recovery rate by about 20%, which provides a reference for realizing the benefit development of shale oil and improving the development effect of other types of shale reservoirs.
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