Study on Plugging Mechanism of Gel Plugging Agent in Fractured Carbonate Oil Reservoirs

Li, Xuejiao; Su, Long-Ji; Fu, Meilong; Li, Qi; Wang, Yingyang

doi:10.1007/s10553-023-01552-2

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…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]. Due to the strong and large-scale flow capacity of fractures, combined with the dense matrix and high injection water pressure, it requires a high strong gel with good mechanical properties to effectively plug the fracture water channeling of a fractured low-permeability reservoir [11,12].…”

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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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

View full text Add to dashboard Cite

show abstract

“…By establishing a three-dimensional fracture initiation and propagation model, taking into account the effects of fracturing parameters such as well completion method, in situ stress, natural fractures, cluster spacing, and displacement on the initiation and propagation of fracturing fractures, the difficulties of indoor conventional experiments limited by small rock and crack sizes and large boundary effects were overcome (Wang et al, 2020;Wang et al, 2020;Tan et al, 2020;Tan et al, 2021a). However, most of the rock and fracture mathematical models built were based on ideal assumptions, which were somewhat different from actual working conditions (Lin et al, 2020;Tang et al, 2021b;Li et al, 2021;Lucas et al, 2021;Li et al, 2022;Wang et al, 2022) conducted true triaxial Fracking experiments on 30 cm and 50 cm cement cube rock mass with prefabricated natural fractures through concrete similar simulation experiments, respectively, and studied the effects of natural fracture development, dip angle and strike, and different stress differences on fracture propagation. Based on the characteristics of the reservoir and the simulation results of largescale fracturing experiments, it is recommended to adopt a volume fracturing concept and process technology that focuses on "large liquid volume, large displacement, and expanded swept volume" to achieve the goal of transforming complex fracture networks.…”

mentioning

confidence: 99%

True triaxial physics simulations and process tests of hydraulic fracturing in the Da’anzhai section of the Sichuan Basin tight oil reservoir

Li,

Fan,

Wang

et al. 2023

Front. Energy Res.

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The limestone reservoir of the Da’anzhai section is the main production layer of Jurassic tight oil in central Sichuan, with tight and strongly heterogeneous reservoir rocks. In the early stages, small-scale plug removal and acidification techniques were mainly applied to the dacite section of the reservoir. However, using a single conversion method was not suitable for tight reservoirs with underdeveloped fractures. To address this challenge, we conducted large-scale real-world triaxial simulation test system experiments on hydraulic fracture propagation using samples from dense limestone outcrops. The aim was to elucidate the laws of hydraulic fracture propagation in dense limestone oil reservoirs. The L1 well in this area was selected to test the volumetric fracturing technology in order to achieve a breakthrough in test production and the reconstruction technology of the Da’anzhai section of the tight limestone reservoir. The experiments have shown that low stress differences, natural fracture development, and low viscosity slippery water are favorable factors for obtaining complex fracture morphology. In contrast to the construction parameters, the structural properties of the rock are the dominant factors in the formation of complex fracture morphologies. By optimizing the geological dessert and implementing targeted technological measures, bulk fracturing has been proven to be feasible for the dense limestone reservoir in the Da’anzhai section.

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Research and application progress of temporary plugging agent for acidification fracturing: A review

Zhou,

Luo,

et al. 2024

Geoenergy Science and Engineering

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Study on Plugging Mechanism of Gel Plugging Agent in Fractured Carbonate Oil Reservoirs

Cited by 3 publications

References 15 publications

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

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

True triaxial physics simulations and process tests of hydraulic fracturing in the Da’anzhai section of the Sichuan Basin tight oil reservoir

Research and application progress of temporary plugging agent for acidification fracturing: A review

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