吉木萨尔页岩油“下甜点”低成本技术

doi:10.13809/j.cnki.cn32-1825/te.2021.04.009

摘要/Abstract

摘要：

吉木萨尔二叠系芦草沟组陆相页岩油藏储量丰富,纵向上存在上、下2个“甜点”富集段,随着开发进程的推进,“下甜点”逐渐成为开发主力层位。“下甜点”具有埋深大、非均质性强等特征,开发难度较大。伴随市场环境压力的影响,急需对工艺技术优化实现页岩油低成本开发。基于吉木萨尔页岩油“下甜点”地质特征,应用数值模拟、室内实验、裂缝监测等方法,对簇间距、滑溜水携砂性能、支撑剂导流能力等方面进行了研究,并开展了密切割、暂堵压裂,石英砂替代,全滑溜水加砂等一系列低成本工艺现场试验。现场应用效果显示：综合采用低成本压裂改造技术,在产量相当的基础上综合压裂成本可降低30 %以上,为吉木萨尔页岩油“下甜点”后续高效开发提供借鉴。

关键词: 页岩油, 密切割, 暂堵压裂, 石英砂替代, 滑溜水加砂, 低成本开发

Abstract:

The Permian Lucaogou Formation in Jimsar is rich in continental shale oil reserves. There are two “sweet spot” developed in the vertical direction. As the development progresses advances, the lower “sweet spot” becomes the main development layer. It has the characteristics of large depth and strong heterogeneity, which makes the development difficult. With the impact of market environmental pressure, it is urgent to optimize the stimulation technology to realize the low-cost development of shale oil. Based on the geological characteristics, the methods of numerical simulation, experiments, and fracture monitoring are used to study the cluster spacing, sand-carrying performance of slick water, conductivity of proppant and so on. Then, a series of low-cost tests such as intensive stage, temporary plugging fracturing, quartz sand replacement, and slick water sand injection have been carried out. The application effect showed that the comprehensively use of low-cost stimulation technology can reduce the cost by at least 30 %, meanwhile, maintain the output. It provides a reference for the subsequent development for Jimsar shale oil.

Key words: shale oil, intensive stage, temporary plugging, quartz sand replacement, slick water sand injection, low-cost development

中图分类号:

TE355

夏赟,张丽萍,褚浩元等. 吉木萨尔页岩油“下甜点”低成本技术[J]. 油气藏评价与开发, 2021, 11(4): 536-541.

Yun XIA,Liping ZHANG,Haoyuan CHU, et al. Low-cost technology of Jimsar shale oil: A case study of lower “sweet spot”[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(4): 536-541.

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井号	垂深（m）	水平段长（m）	改造段长（m）	钻遇率（%）	孔隙度（%）	饱和度（%）	段间距（m）	平均簇间距（m）	加砂量（m³）	进液量（m³）	排量（m³/min）
J₁	3 524	1 610	1 200	69.5	11.6	64	75.0	14.8	2 321	30 035	12~14
J₂	3 535	1 540	982	74.8	10.3	64	46.8	14.7	1 980	29 015	12~14