Mechanism of damage-induced fracture formation in shale reservoir penetrated by shaped charge jet

MU Gongyu; LUO Ning; SHEN Tao; LIANG Hanliang; CHAI Yabo; ZHAI Cheng

doi:10.11883/bzycj-2022-0182

Volume 43 Issue 3

Mar. 2023

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MU Gongyu, LUO Ning, SHEN Tao, LIANG Hanliang, CHAI Yabo, ZHAI Cheng. Mechanism of damage-induced fracture formation in shale reservoir penetrated by shaped charge jet[J]. Explosion And Shock Waves, 2023, 43(3): 033301. doi: 10.11883/bzycj-2022-0182

Citation:

MU Gongyu, LUO Ning, SHEN Tao, LIANG Hanliang, CHAI Yabo, ZHAI Cheng. Mechanism of damage-induced fracture formation in shale reservoir penetrated by shaped charge jet[J]. Explosion And Shock Waves, 2023, 43(3): 033301. doi: 10.11883/bzycj-2022-0182

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Mechanism of damage-induced fracture formation in shale reservoir penetrated by shaped charge jet

doi: 10.11883/bzycj-2022-0182

MU Gongyu^{1, 2, 3
,},
LUO Ning^{1, 2, 3
,
,},
SHEN Tao^{1, 3},
LIANG Hanliang^{1, 3},
CHAI Yabo^{1, 3},
ZHAI Cheng⁴

1.
State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
3.
School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
4.
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

Received Date: 2022-04-27
Rev Recd Date: 2022-06-08

Available Online: 2022-06-09

Publish Date: 2023-03-05

Abstract

Abstract

To study the influence mechanism of shaped charge liner on the perforation and damage-induced fracturing effect of shale reservoir by shaped charge penetration, a three-dimensional perforating charge-air-shale model was established. The cone angles of the liner are 50°, 60°, 70°, and 80°. The liner thicknesses are 0.5 mm, 1.0 mm, and 1.5 mm. And the materials of the liner are copper, steel, titanium, and tungsten. The numerical calculation was carried out using the ALE-Lagrangian coupling method in the non-linear program ANSYS/LS-DYNA. The ALE method was used to describe shell, explosive, liner, and air, while the Lagrangian method was used to describe the shale reservoir. A systematic analysis was carried out on the aspects of jet velocity and shape, shale perforation effect, and fracture extension characteristics of shale. The results show that with the decrease of the cone angle of the liner, the jet velocity and penetration depth increase, and the pestle velocity and perforation diameter decrease. In a certain range, with the decreasing liner thickness, the jet velocity, penetration depth, and perforation inclination increase, and the mass of the pestle decrease. The liner material significantly influences the jet velocity, pestle structure, and shale perforation effect. Among them, the penetration depth of perforating charge with a tungsten liner is the largest, but the perforation diameter is the smallest, the penetration depth of perforating charge with a titanium liner is the smallest, but the perforation inclination is the largest, and the penetration depth of perforating charge with a copper liner is slightly larger than that with a steel liner, but the perforation diameter is slightly smaller. Because the detonation pressure has an obvious difference before and after the detonation wave transmitted to the end of the explosive, which affects the jet velocity and penetration depth, the charge with a shell has a greater jet velocity and penetration depth than the charge without a shell. By comparing the fracture extension characteristics of shale in different groups, it is found that the fracture extension of shale mainly occurs in the stage of re-reaming of a pestle on shale. It is concluded that the material and structure of the liner have a significant influence on the shaped charge jet and its penetration effect, which then affects the damage-induced fracture formation and extension in shale. The fracture extension of the shale can be promoted by reducing the initial perforation diameter of penetration, increasing the diameter of the pestle, and increasing the speed of the pestle.
- shaped charge perforation,
- shale reservoir,
- liner,
- fracture extension,
- 3D perforating charge-air-shale model

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References(25)

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