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Cluster spacing optimization of deep shale gas fracturing with non-uniform geostress.

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Bibliographic Details
Title:	Cluster spacing optimization of deep shale gas fracturing with non-uniform geostress.
Authors:	Lin, Ran¹ (AUTHOR), Yu, Zhihao¹ (AUTHOR), Zhao, Jinzhou¹ (AUTHOR) zhaojz_y_swpu@126.com, Ren, Lan¹ (AUTHOR), Wu, Jianfa² (AUTHOR), Wu, Jianjun³ (AUTHOR), Song, Yi² (AUTHOR), Zheng, Danzhu⁴ (AUTHOR)
Source:	Petroleum Science & Technology. 2024, Vol. 42 Issue 13, p1603-1620. 18p.
Subjects:	Oil shales, Crack propagation, Shale gas
Abstract:	Cluster spacing optimization in non-uniform stress field, with the optimal stimulated reservoir volume (SRV) as target, which is critical for deep shale gas fracturing performance. A non-uniform stress field characterization model and a fracture network propagation model were constructed. The diagrams of the optimal cluster spacing were drawn based on the fault development in the Y1-01 well area. The results showed that the horizontal well should be deployed at a distance of between 2,000 and 4,000 m from the first-level fault, 1,500 and 2,500 m from the second-level fault, 700 and 1,200 m from the third-level fault, and an acceptable distance from the fourth-level fault. The shorter the distance to the fault for first-level faults, the bigger difference in horizontal stress, which was not conducive for fracture network propagation, and the smaller the optimal cluster spacing. For second-level, third-level, and fourth-level faults, when the fault strike was less than 50°, the closer to the fault, the bigger the difference in horizontal stress and the smaller the optimal cluster spacing. When the fault strike was greater than 50°, the farther away from the fault, the bigger the difference in horizontal stress, and the smaller the optimal cluster spacing. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Cluster spacing optimization in non-uniform stress field, with the optimal stimulated reservoir volume (SRV) as target, which is critical for deep shale gas fracturing performance. A non-uniform stress field characterization model and a fracture network propagation model were constructed. The diagrams of the optimal cluster spacing were drawn based on the fault development in the Y1-01 well area. The results showed that the horizontal well should be deployed at a distance of between 2,000 and 4,000 m from the first-level fault, 1,500 and 2,500 m from the second-level fault, 700 and 1,200 m from the third-level fault, and an acceptable distance from the fourth-level fault. The shorter the distance to the fault for first-level faults, the bigger difference in horizontal stress, which was not conducive for fracture network propagation, and the smaller the optimal cluster spacing. For second-level, third-level, and fourth-level faults, when the fault strike was less than 50°, the closer to the fault, the bigger the difference in horizontal stress and the smaller the optimal cluster spacing. When the fault strike was greater than 50°, the farther away from the fault, the bigger the difference in horizontal stress, and the smaller the optimal cluster spacing. [ABSTRACT FROM AUTHOR]
ISSN:	10916466
DOI:	10.1080/10916466.2022.2148694