Self-filling and plugging performance of a thixotropic polymer gel for lost circulation control in fractured formation

Bai, Yingrui; Yang, Jingbin; Sun, Jian; Shang, Xiaosen; Han, Jinliang

doi:10.1016/j.geoen.2023.211717

Cited by 7 publications

(1 citation statement)

References 36 publications

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“…In deep-water basins, the transport of gas 2 of 21 into and through the Gas Hydrate Stability Zone (GHSZ) via fractures has been observed through drilling in fine-grained successions, and is widely considered useful as a model with which to explain the leakage of fluids [5,8]. In recent years, numerous nodular and sheet-like hydrates that cause fractured reservoirs have been found in the north of the South China Sea [9]; thus, their characteristics, including their composition, distribution, spacing, density, and length, are of great interest to many scholars [10].…”

Section: Introductionmentioning

confidence: 99%

Distribution Patterns and Genesis of Geological Fractures/Microfaults in the Qiongdongnan Basin, North of the South China Sea

Yu,

Song,

Chao

2023

JMSE

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The Qiongdongnan Basin (QDNB), located in the north of the South China Sea, is a Cenozoic rift basin with abundant oil and gas resources. Large flake hydrates have been found in the core fractures of Quaternary formations in the deep-water depression of the QDNB. In order to understand the spatial distribution patterns of these fractures, their geneses in sedimentary basins, and their influences on gas migration and accumulation, such fractures have been observed using high-resolution 3D seismic images and visualization techniques. Four types of fractures and their combinations have been identified, namely bed-bounded fractures/microfaults, unbounded fractures, fracture bunches, and fracture clusters. Bed-bounded fractures/microfaults are mainly short and possess high density; they have developed in mass transport depositions (MTDs) or Meishan and Sanya Formations. The unbounded fractures/microfaults that occur in Miocene–Pliocene formations are mainly long and discrete, and are dominantly caused by strong tectonic movements, the concentration of stress, and sustained intense overpressure. The fracture bunches and fracture clusters that occur in Oligocene–Early Miocene formations have commonly developed with the accumulation of large numbers of fractures and may be related to the release of pressure, diapirs, and basement fault blocks (228.9 ± 1 Ma). In this study, six fluid charging or leakage models are proposed based on distinct fracture types, assuming the uniform conductivity of each fracture. In a 3D space view, a vertical decrease in the fracture scale (number or density) will more likely result in gas supply than dispersion, thus promoting the accumulation of gas in the reservoirs. Nevertheless, the fractures above the Bottom Simulating Reflect (BSR)/seismic anomaly are excessively developed, and bed-bounded fractures within a particular layer, such as MTDs, can easily cause seabed leakage. These results are useful for explaining the vertical migration of gas/fluids in areas and formations with less developed gas chimneys, faults, diapirs, and other structures, particularly in post-rifting basins.

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Section: Introductionmentioning

confidence: 99%

Distribution Patterns and Genesis of Geological Fractures/Microfaults in the Qiongdongnan Basin, North of the South China Sea

Yu,

Song,

Chao

2023

JMSE

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Clarify the effect of fracture propagation on force chains evolution of plugging zone in deep fractured tight gas reservoir based on photoelastic experiment

Yan,

Huo,

Deng

et al. 2024

Geoenergy Science and Engineering

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Tunable macroscopic self-healing of supramolecular gel through host–guest inclusion

Li,

Hao,

et al. 2024

Physics of Fluids

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Supramolecular gels (SGs) consisted of noncovalent cross-linking network structures are fascinating due to their efficient energy dissipation and reversible self-healing properties. However, it is unknown how the noncovalent interactions alter the macroscopic self-healing and mechanical properties of SGs. Herein, the peculiar nature of SGs manufactured by combining covalent and noncovalent (host–guest inclusion of β-cyclodextrin and C16 hydrophobic chain) cross-linking structures was studied and compared with covalent cross-linking preformed particle gels. The macroscopic self-healing behaviors, rheology, mechanical tensile properties, as well as the tunable mechanisms of self-healing were explored by visual inspection, rheological, and atomic force microscopy probing methods. The results show that the SGs exhibit excellent self-healing efficiency and mechanical strength after interfacial cutting. Moreover, the SGs exhibited excellent mechanical tensile properties, including loading–unloading, successive loading–unloading, and recovery loading–unloading tensile performances. Notably, the macroscopic self-healing of SGs has good tunability by changing the covalent and noncovalent crosslinker contents and salt contents. This peculiar phenomenon is attributed to certain host–guest inclusion forces (4.7 and 0.3 nN) between different SGs under the distilled and high-salinity water conditions, respectively. This study is beneficial for the development of stimuli–response supramolecular gels in different applications, such as oil recovery in fractured reservoirs.

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Self-filling and plugging performance of a thixotropic polymer gel for lost circulation control in fractured formation

Cited by 7 publications

References 36 publications

Distribution Patterns and Genesis of Geological Fractures/Microfaults in the Qiongdongnan Basin, North of the South China Sea

Distribution Patterns and Genesis of Geological Fractures/Microfaults in the Qiongdongnan Basin, North of the South China Sea

Clarify the effect of fracture propagation on force chains evolution of plugging zone in deep fractured tight gas reservoir based on photoelastic experiment

Tunable macroscopic self-healing of supramolecular gel through host–guest inclusion

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