Parameter optimization and field practice of CO<sub>2</sub> pre-fracturing process in Jimsar shale oil block

ZHAO Kun; LI Zeyang; LIU Juanli; HU Ke; JIANG Ranran; WANG Weixiang; LIU Xiuzhen

doi:10.13809/j.cnki.cn32-1825/te.2024.01.012

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Parameter optimization and field practice of CO₂ pre-fracturing process in Jimsar shale oil block

更新时间：2025-12-05

- Parameter optimization and field practice of CO₂ pre-fracturing process in Jimsar shale oil block
- Petroleum Reservoir Evaluation and Development Vol. 14, Issue 1, Pages: 83-90(2024)
- 作者机构：
  
  1. 中国石油新疆油田分公司吉庆油田作业区，新疆吉木萨尔 831700中国石油新疆油田分公司准东采油厂，新疆阜康,831511
  2. 中国石油新疆油田分公司准东采油厂，新疆阜康,831511
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2024.01.012
  CLC： TE357
- Published：2024
- 稿件说明：
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ZHAO Kun, LI Zeyang, LIU Juanli, et al. Parameter optimization and field practice of CO₂ pre-fracturing process in Jimsar shale oil block[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(1): 83-90.
DOI：

ZHAO Kun, LI Zeyang, LIU Juanli, et al. Parameter optimization and field practice of CO₂ pre-fracturing process in Jimsar shale oil block[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(1): 83-90. DOI： 10.13809/j.cnki.cn32-1825/te.2024.01.012.

摘要

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CO

前置压裂辅助提产技术研究和现场试验，系统地研究分析CO

前置蓄能压裂和CO

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CO

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CO

前置压裂的工艺技术体系。根据生产数据预测，CO

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。

Abstract

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 CO

pre-fracturing assiste

d production technology were carried out in Jimsar shale oil block. The application effect of CO

pre-storage fracturing and CO

huff and puff in Jimsar shale oil block was systematically studied and analyzed. The results indicate that supercritical CO

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 CO

pre-fracturing in shale oil reservoirs was established. According to the prediction of production data

the CO

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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Parameter optimization and field practice of CO2 pre-fracturing process in Jimsar shale oil block

DOI：10.13809/j.cnki.cn32-1825/te.2024.01.012

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Abstract

关键词

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Parameter optimization and field practice of CO₂ pre-fracturing process in Jimsar shale oil block