Effect of Isolated Fracture on the Carbonate Acidizing Process

Jia, Cunqi; Huang, Tao; Ye, Jun; Xing, Hongchuan; Zhang, Haiyang

doi:10.3389/feart.2021.698086

Cited by 14 publications

(4 citation statements)

References 29 publications

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“…The peak area is reduced from 197,080.22 to 105,088.312, and the signal of the relaxation time in the range of 0.01−0.1 ms almost disappears, which indicates that the ADS effectively seals the core. 24 This is also confirmed by the NMR images before and after plugging, where the pore space where water can enter the core is reduced after plugging, which is shown in the image as a significant reduction of the red part.…”

Section: Hole Plugging Performancesupporting

confidence: 56%

Development of High-Temperature and High-Mineralization-Resistant Adaptive Plugging Agent and Its Performance Evaluation

Sun

li³

et al. 2023

Energy Fuels

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Most of the existing drilling fluid plugging agents fail in the high-temperature and high-mineralization environment of deep formations, and the drilling fluid will enter the deep part of the formation along microfractures and fractures, causing a series of downhole complications and accidents, which seriously affects the safety and efficiency of drilling and results in great economic losses. It is important to develop a high-temperature and high-mineralization-resistant plugging agent to effectively plug the formation for the development of deep oil and gas. In this paper, an adaptive plugging agent ADS is prepared by emulsion polymerization using 2-acrylamide-2-methylpropanesulfonic acid, N,N-dimethylacrylamide, and styrene as raw materials, which is resistant to high temperature and high mineralization in water-based drilling fluids, and is resistant to temperature up to 180 °C, sodium salt resistant to saturation, and calcium salt resistant to 5%. It has less influence on the rheology of the drilling fluid system.

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Section: Hole Plugging Performancesupporting

confidence: 56%

Development of High-Temperature and High-Mineralization-Resistant Adaptive Plugging Agent and Its Performance Evaluation

Sun

li³

et al. 2023

Energy Fuels

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“…A gas-water two-phase flow model was established for a fractured horizontal well considering the influence of water saturation on gas-water permeability. Sensitive studies were performed to investigate the impact of various parameters on the productivity of a horizontal well [16,17]. The flow back period can be used to quantitatively identify the characteristics of the formed fracture network and calculate the effective fracture network volume; however, such data analysis is not commonly reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

The Inversion Method of Shale Gas Effective Fracture Network Volume Based on Flow Back Data—A Case Study of Southern Sichuan Basin Shale

Tang,

Wu,

Zhao

et al. 2024

Processes

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Fracture network fracturing is pivotal for achieving the economical and efficient development of shale gas, with the connectivity among fracture networks playing a crucial role in reservoir stimulation effectiveness. However, flow back data that reflect fracture network connectivity information are often ignored, resulting in an inaccurate prediction of the effective fracture network volume (EFNV). The accurate calculation of the EFNV has become a key and difficult issue in the field of shale fracturing. For this reason, the accurate shale gas effective fracture network volume inversion method needs to be improved. Based on the flow back characteristics of fracturing fluids, a tree-shaped fractal fracture flow back mathematical model for inversion of EFNV was established and combined with fractal theory. A genetic algorithm workflow suitable for EFNV inversion of shale gas was constructed based on the flow back data after fracturing, and the fracture wells in southern Sichuan were used as an example to carry out the EFNV inversion. The reliability of the inversion model was verified by testing production, cumulative gas production, and microseismic results. The field application showed that the inversion method proposed in this paper can obtain tree-shaped fractal fracture network structure parameters, fracture system original pressure, matrix gas breakthrough pressure, fracture compressibility coefficient, reverse imbibition index, equivalent main fracture half length, and effective initial fracture volume (EIFV). The calculated results of the model belong to the same order of magnitude as those of the HD model and Alkouh model, and the model has stronger applicability. This research has important theoretical guiding significance and field application value for improving the accuracy of the EFNV calculation.

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“…Hydraulic fracturing is one of the standard techniques adopted to enhance oil and gas production in unconventional reservoirs (Jia et al 2021 ; Liu et al 2019 ; Osiptsov 2017 ; Wang et al 2017a ; Zhao et al 2019a ), as well as to improve coal seam permeability and coal caveability in mining industry (Cai et al 2019 ; Huang et al 2015 ; Ma et al 2021 ). The existence of intrinsic discontinuities, e.g., natural fractures and bedding planes, allow for the hydraulic fracturing process to generate complex fracture networks, forming highly conductive flow channels required for economic production (Li et al 2022 ; Sheng et al 2018 ; Sun et al 2022b ).…”

Section: Introductionmentioning

confidence: 99%

An efficient 3D cell-based discrete fracture-matrix flow model for digitally captured fracture networks

Sun,

Li,

Abdelaziz

et al. 2023

Int J Coal Sci Technol

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Complex hydraulic fracture networks are critical for enhancing permeability in unconventional reservoirs and mining industries. However, accurately simulating the fluid flow in realistic fracture networks (compared to the statistical fracture networks) is still challenging due to the fracture complexity and computational burden. This work proposes a simple yet efficient numerical framework for the flow simulation in fractured porous media obtained by 3D high-resolution images, aiming at both computational accuracy and efficiency. The fractured rock with complex fracture geometries is numerically constructed with a cell-based discrete fracture-matrix model (DFM) having implicit fracture apertures. The flow in the complex fractured porous media (including matrix flow, fracture flow, as well as exchange flow) is simulated with a pipe-based cell-centered finite volume method. The performance of this model is validated against analytical/numerical solutions. Then a lab-scale true triaxial hydraulically fractured shale sample is reconstructed, and the fluid flow in this realistic fracture network is simulated. Results suggest that the proposed method achieves a good balance between computational efficiency and accuracy. The complex fracture networks control the fluid flow process, and the opened natural fractures behave as primary fluid pathways. Heterogeneous and anisotropic features of fluid flow are well captured with the present model.

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Effect of Isolated Fracture on the Carbonate Acidizing Process

Cited by 14 publications

References 29 publications

Development of High-Temperature and High-Mineralization-Resistant Adaptive Plugging Agent and Its Performance Evaluation

Development of High-Temperature and High-Mineralization-Resistant Adaptive Plugging Agent and Its Performance Evaluation

The Inversion Method of Shale Gas Effective Fracture Network Volume Based on Flow Back Data—A Case Study of Southern Sichuan Basin Shale

An efficient 3D cell-based discrete fracture-matrix flow model for digitally captured fracture networks

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