准噶尔盆地吉木萨尔凹陷芦草沟组页岩油上甜点地质工程一体化开发实践

doi:10.3969/j.issn.1672-7703.2019.05.014

摘要/Abstract

摘要： 准噶尔盆地吉木萨尔凹陷芦草沟组（P2l）页岩油资源富集、开发潜力巨大。自首口水平井吉172_H 井获得产量突破以来，围绕页岩油规模效益开发的目标，对10 口水平井开展体积压裂技术攻关试验，但生产效果均未达预期。通过地质工程一体化联合，在确定P2l2 2-2 岩屑长石粉细砂岩层为优质甜点目标、明确优质甜点钻遇率是压后高产地质保障的基础上，分析了层理面和高强度泥岩隔层对人工裂缝纵向延伸能力的限制作用，对比了已实施水平井的压裂改造参数差异，提出了水平井密切割、高强度体积改造的提产提效技术对策。2017 年部署的开发试验井创造了最高日产108.3t、投产240 天累计产油过万吨的新生产纪录；2018 年推广试验水平井10 口，投产5 个月平均日产油量达到30.4t，充分证明水平井密切割、高强度体积改造可以有效提高单井产量，取得较高的开发效益，为吉木萨尔凹陷页岩油的规模开发奠定了扎实的技术基础，提供了有力的工程支撑。

关键词: 吉木萨尔, 页岩油, 水平井, 体积压裂, 优质甜点

Abstract: The shale oil resource accumulation and development potential of the Lucaogou Formation (P2l) in Jimsar sag, Junggar Basin are huge. Since the production breakthrough of the horizontal well Ji 172_H, the volume fracturing technology has been tested on 10 horizontal wells with the goal of shale oil scale benefit development, but the production results have not reached the expected level. Through the geology-engineering integration, on the basis of determining the P2l22-2 lithic feldspar fine siltstone layer as the high-quality sweet spot and the clear recognition that high-quality sweet spot drilling rate is the geological guarantee of post-fracture high-yield, the restriction from the bedding plane and high-strength mudstone barrier to the vertical extension ability of the artificial fracture are analyzed, the differences of fracturing transformation parameters of the horizontal well which volume fracturing has been implemented are compared, and the technical countermeasures of intensive spacing and high intensity volume fracturing of horizontal wells for improving the production and efficiency are proposed. The development test well deployed in 2017 created a new production record with a maximum daily output of 108.3t and a total production of over 10,000 tons of oil in 240 days. In 2018, 10 horizontal wells were put in test and the average daily oil production was 50.4 tons. It is proved that the intensive spacing and high intensity volume fracturing of horizontal wells can effectively improve the single well production and achieve higher development benefits, which lays a solid technical foundation for the scale development of the Jimsar sag shale oil and provides a strong engineering support.

中图分类号:

吴宝成, 李建民, 邬元月, 韩乐, 赵廷峰, 邹雨时. 准噶尔盆地吉木萨尔凹陷芦草沟组页岩油上甜点地质工程一体化开发实践[J]. 中国石油勘探, 2019, 24(5): 679-690.

Wu Baocheng, Li Jianmin, Wu Yuanyue, Han Le, Zhao Tingfeng, Zou Yushi. Development practices of geology-engineering integration on upper sweet spots of Lucaogou Formation shale oil in Jimsar sag, Junggar Basin[J]. China Petroleum Exploration, 2019, 24(5): 679-690.

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