Physical and numerical simulation of inter-fracture flooding in heterogeneous tight oil reservoirs

Yi, Yang; Liao, Guangzhi; Xiong, Wei; Shen, Rui; Zhang, Jie; Li, Qi; Wang, Shengzhou; Zhang, Jianzhong; Tan, Lingfang; Shao, Guoyong

doi:10.1016/j.egyr.2022.09.194

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…At the early stage of development, most oil wells undergo hydraulic fracturing to increase oil production, resulting in complex fracture networks within the reservoirs. However, as water injection operations deepen and injection-production schemes are adjusted, the injected water can flow through the fractures due to the high conductivity, leading to water breakthrough in the corresponding oil wells [1][2][3][4][5]. To address this issue, using gel to plug the fracture water channeling has been considered the most reliable measurement for the efficient development of such reservoirs [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study on a Strong Polymer Gel by the Addition of Micron Graphite Oxide Powder and Its Plugging of Fracture

Shi,

Zhang,

Zhang

et al. 2024

Gels

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It is difficult to plug the fracture water channeling of a fractured low-permeability reservoir during water flooding by using the conventional acrylamide polymer gel due to its weak mechanical properties. For this problem, micron graphite powder is added to enhance the comprehensive properties of the acrylamide polymer gel, which can improve the plugging effect of fracture water channeling. The chemical principle of this process is that the hydroxyl and carboxyl groups of the layered micron graphite powder can undergo physicochemical interactions with the amide groups of the polyacrylamide molecule chain. As a rigid structure, the graphite powder can support the flexible skeleton of the original polyacrylamide molecule chain. Through the synergy of the rigid and flexible structures, the viscoelasticity, thermal stability, tensile performance, and plugging ability of the new-type gel can be significantly enhanced. Compared with a single acrylamide gel, after adding 3000 mg/L of micrometer-sized graphite powder, the elastic modulus, the viscous modulus, the phase transition temperature, the breakthrough pressure gradient, the elongation at break, and the tensile stress of the acrylamide gel are all greatly improved. After adding the graphite powder to the polyacrylamide gel, the fracture water channeling can be effectively plugged. The characteristics of the networked water flow channel are obvious during the injected water break through the gel in the fracture. The breakthrough pressure of water flooding is high. The experimental results are an attempt to develop a new gel material for the water plugging of a fractured low-permeability reservoir.

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