Review on the Applications and Modifications of the Chen–Guo Model for Hydrate Formation and Dissociation

Abstract

Research on gas hydrates is relevant to many industrial issues including flow assurance in oil and gas production and transportation, exploitation of new energy deposits in the form of natural gas hydrates, gas storage, separation, and more. The thermodynamic modeling of a gas hydrate formation is a fundamental work for all gas hydrate research. Considering the drawbacks of the traditional van der Waals−Platteeuw type models, Chen and Guo proposed a new approach to the modeling of hydrate formation/dissociation based on a reaction plus adsorption two-step hydrate formation mechanism instead of the single adsorption mechanism in van der Waals−Platteeuw theory. Since the establishment of the Chen−Guo model in the 1990s, it has achieved wide applications in modeling of hydrate formation thermodynamics, kinetics, and hydrate-based technical processes. For removing the limitations of the original Chen−Guo model, a series of extensions or modifications have been done successfully by many researchers to make it suitable for different complicated systems, including structure-H and semiclathrate hydrates, sour gas/inhibitor/promoter-containing systems, water-in-oil emulsion systems, and porous systems. The aim of this review is to summarize these applications, extensions, and modifications to the Chen− Guo model as well as the two-step mechanism in recent years. Almost 190 references have been cited in this review. We hope it will be helpful for the gas hydrate community.

Hydrate Deposition Model and Flow Assurance Technology in Gas-Dominant Pipeline Transportation Systems: A Review

“…Ravichandran et al 26 proposed a pseudosteady-state mechanical model to predict the amount of 34 1934−2018 the methods adopted and contributions made by each experimental group in the cold flow technology of rehydrating were summarized; the deposition mechanism of the hydrate wall and the method for measuring the parameters of fluid cold flow converting into a hydrate slurry were further studied Liu et al 35 1955−2020 the new wax deposition mechanism and typical experimental devices proposed in recent years are summarized; the experimental studies and prediction models of wax deposition or wax−hydrate coupling deposition in single-, two-, and three-phase flows are classified Wang et al. 36 1940−2020 this paper reviews a series of extensions and improvements of the Chen−Guo model to eliminate the original limitations, applicable to different complex systems, including structural H and semi-enclosed hydrates, sulfur-containing gas/inhibitor/accelerator systems, oil-in-water emulsion systems, and porous systems Shi et al 37 1983−2021 the application of traditional hydrate management strategy and risk hydrate management strategy in China is summarized; the research on hydrate thermodynamics and kinetics, hydrate particle aggregation, deposition, and plugging mechanism, and hydrate plugging risk prediction and evaluation methods were systematically reviewed Aman et al 15 1811−2021 the development and evolution of hydrate blockage mechanism in the oil-dominated system and the progress in the development technology of low-dose hydrate inhibitors brought about by the exploration process were introduced historically; on the basis of the blockage mechanism of the first gas-dominated system, the experimental study on the Chinese flow loop of the gas-dominated system is summarized…”

Flow Assurance of Hydrate Risk in Natural Gas/Oil Transportation: State-of-the-Art and Future Challenges

“…It can be proved that the control step of lateral growth is presented as the diffusion of methane molecules near the front edge of the hydrate film. Therefore, the growth of hydrate film is significantly affected by the heat and mass transfer at the gas–water interface. − In recent years, the heat and mass transfer characteristics of the growth process of single particle hydrate have also been investigated, as shown in Figure c and d. Zhao et al measured the directly time-dependent kinetic data of hydrate growth by micro-XCT to obtain the microstructure and kinetics of hydrate formation.…”

Virtual Special Issue of Recent Research Advances in China: Unconventional Gas

“…There are 29 papers on the topic related to hydrate, of which 9 of them are reviews and 19 of them are original research articles. Wang et al 32 reports the state-of-the-art summary of the modifications to the Chen−Guo model and the application of this model to several gas hydrate applications. Li et al 33 presents an account of the research on hydrate-based CH 4 separation from low-concentration CBM conducted by Chinese researchers over the past 10 years.…”