Innovation and practice of geology and engineering integrated fracturing technology for shale oil in Yingxiongling area in the western Qaidam Basin

doi:10.3969/j.issn.1672-7703.2023.04.010

Abstract

Abstract: The limy dolomite and shale are well developed in Lower Ganchaigou Formation shale series in Yingxiongling area in Qaidam Basin, and the favorable reservoirs of limy-dolomitic flat are superimposed and interbedded with high-quality source rocks, showing huge exploration and development potential of shale oil resources. However, there are some difficulties in reservoir reconstruction, such as high field stress, high stress difference, high-frequency sedimentary cycle, well-developed lamination in vertical direction, and strong reservoir heterogeneity. Therefore, it is urgent to develop a highly applicable and high-efficiency fracturing technology system to support the benefit exploration and high-efficiency development. By conducting geomechanical experiments, the law of shale rupture and fracture propagation is clarified, and the reservoir reconstruction idea of “controlling nearby fractures and propagating long fractures” is formulated; A new algorithm of 1D geomechanics and fracability is researched, and a 3D fine geomechanical model is established; The combination of model simulation optimization and data-driven optimization is applied to form a network fracturing technology template for vertical wells; By benchmarking the mainstream practices and key parameters of volume fracturing of continental shale oil in China, the concept of geology and engineering integration is implemented in cluster setting and fracturing parameters optimization, achieving the upgrade of volume fracturing technology with the core of “high-density cutting, extremely limiting flow perforation, large displacement, large scale, high-intensity and continuous slickwater sand addition, inverse composite ‘controlling nearby fractures and propagating long fractures’, and high quartz sand percentage”. A total of 37 fracturing operations were conducted in vertical wells, with an oil rate of 2.1-44.9 m³/d, and the wells with commercial oil flows accounted for 97.2%; Another six fracturing operations were conducted in horizontal wells, with the maximum oil rate of 113.5 m³/d, and the proven shale oil geological reserves of 5×10⁸ t in the upper member of Lower Ganchaigou Formation.

CLC Number:

TE357.1

Xie Guiqi, Lin Hai, Liu Shiduo, Liu Yong, Wan Youyu, Zhang Chengjuan, Li Yafeng, Cui Ronglong, Lei Fengyu, Sui Guojie, Deng Liben, Zhang Tao, Liu Huan, Liu Yunyi, Pu Yongxia. Innovation and practice of geology and engineering integrated fracturing technology for shale oil in Yingxiongling area in the western Qaidam Basin[J]. China Petroleum Exploration, 2023, 28(4): 105-116.

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