A Study on the Formation and Removing Mechanisms of a Gas Hydrate Slug in Gas Pipelines

Liu, C.; Li, M; Wang, W.; Li, D.; Wang, L.

doi:10.1080/10916466.2011.588634

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Lv et al 34 simulated the flow characteristics of the gas/hydrate slurry system with the help of the Euler model, and the simulation results showed that the pressure drop and liquid holdup in the pipeline increased with the formation of hydrate particles. This research conclusion was consistent with the result of the slug flow model conducted by Liu et al 35 in the oil-in-water system, who believed that the formation of hydrate would lead to the increase of pipeline pressure drop. Previously, Wang et al 36 combined hydraulics, heat transfer, and hydrate growth dynamics to simulate multiphase flow and hydrate wall growth in deep-water gas wells and predict hydrate blockage in the gas-dominated pipe flow system.…”

Section: Introductionsupporting

confidence: 91%

Gas Hydrate Formation and Slurry Flow Characteristics of Gas–Liquid–Solid Multiphase Systems

Yang

et al. 2023

Energy Fuels

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Hydrate formation, aggregation, and deposition have become major hazards for the safe transportation of oil and gas pipelines. Although there has been a great deal of research into the behavior of particles during hydrate formation and transport, there is less research into the multiphase generation and flow characteristics of hydrate gas and liquids. In this paper, the flow characteristics of hydrate slurry and the flow pattern transition in gas–liquid multiphase system were studied, and the generations of it were compared between a gas–liquid multiphase system and oil–water emulsion system. The results showed that the flow parameters such as pressure, pressure drop, and density fluctuated more drastically in the gas–liquid system than that in the emulsion system, the higher fluctuation meant a higher risk of pipe plugging. At the same time, the influence of pressure and dosage on multiphase flow pattern transformation and boundary change conditions were studied. A gas-slurry flow pattern transformation diagram was drawn based on the defined transformation conditions between flow patterns. The results also indicated that, with the increase of pressure from 5 to 6 MPa, the boundary of slug flow and air mass flow changed to the direction of higher gas and liquid flow velocity. While the boundary of slug flow and wave flow, stratified flow and wave flow changed to the direction of higher gas flow velocity. The boundary of slug flow and air mass flow changed to the direction of lower liquid flow velocity. In contrast, the boundary of slug flow and wave flow, stratified flow and wave flow, slug flow and stratified flow changed to the direction of higher gas flow velocity and lower liquid flow velocity in the 1% inhibitor period compared with that without the inhibitor. This study will provide theoretical references and technological supports for the safety of multiphase transportation pipelines and the safety of deep water production.

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Section: Introductionsupporting

confidence: 91%

Gas Hydrate Formation and Slurry Flow Characteristics of Gas–Liquid–Solid Multiphase Systems

Yang

et al. 2023

Energy Fuels

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“…This indicated that gas production was slow in the process of hydrate dissociation driven by heat transfer in coal. Moreover, Li et al, by means of numerical simulation, studied that the dissociation rate of hydrate was far less than the formation rate, and the reduction of pressure can only increase the dissociation rate to a very limited extent.…”

Section: Resultsmentioning

confidence: 99%

Kinetics of Hydrate Formation and Dissociation in Coal at Different Temperatures Based on Impedance Method

Zhang

Xue

et al. 2020

ACS Omega

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In the process of coal mining, gas outburst is a challenge that must be prevented to guarantee mining safety. Forming gas hydrate in coal can reduce the original gas pressure and delay the concentrative outbursts of gas flow, which is one of the potential technologies to prevent gas outbursts in coal. In this work, we perform the formation and dissociation kinetics experiment of hydrate in the presence of coal and tetrahydrofuran (THF) at the temperature based on different geological conditions in China by means of the experimental device with the impedance measurement function. The results showed that the impedance change can qualitatively describe the kinetic characteristics of hydrate formation and dissociation in coal. The sudden change in pressure and system impedance during gas hydrate formation indicated the nucleation point at which hydrate formation started, by which the induction time can be acquired. Pressure and impedance suddenly changed at the same time, which implied that methane molecules and tetrahydrofuran (THF) molecules entered the hydrate phase at the same time. When the dissociation temperature increased to 303.15 K, the hydrate dissociation rate can be less affected by dissociation temperature if it continued to increase. This work highlights that gas hydrate formation in coal can effectively prevent gas outbursts.

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“…They also brought about the well control strategy for fractured formations. Li believed that the gas kick in a gravity displacement is a pulsating kick. The process of gas–liquid displacement was as follows: under the condition of slight overbalance, the drilling mud entered the fracture from the bottom of the wellbore, which squeezed the gas in the fracture.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Gas–Liquid Gravity Displacement in Vertical Fractures during Drilling of Carbonate Formations

Peng

Deng

et al. 2023

ACS Omega

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In petroleum drilling, carbonate formations characterized by natural fractures can result in troublesome gas–liquid gravity displacement, which refers to the phenomenon that the drilling mud leakage and gas kick are simultaneously triggered. This work focuses on clarifying the mechanism of gas–liquid displacement in vertical fractures during the drilling of carbonate formations and investigating the characteristics of gas–liquid displacement under various conditions. First, the bottom hole pressure allowing for gas–liquid gravity displacement is analyzed, which determines the coexistence condition of leakage and kick in vertical fractures. Then, a theoretical model of gas–liquid displacement flow in a vertical fracture is established. To verify the reliability and accuracy of the model, the results of numerical simulation are compared with those of a visualization experiment. The development process and flow characteristics of gas–liquid displacement in the fracture under different conditions are numerically simulated. The effects of pressure difference, drilling mud property, and fracture geometry on the gas–liquid displacement rate are analyzed. It is found that the drilling mud leakage rate increases with the increase of fracture width, fracture height, and drilling mud density, while it decreases with the increase of pressure difference and fracture length. The gas invasion rate increases with the increase of fracture width, fracture height, and pressure difference, while it decreases with the increase of drilling mud density and fracture length. The equations for leakage rate and gas invasion rate are derived by the response surface method, and the methods for mitigating gas–liquid gravity displacement are discussed. It is expected that the present work provides a better understanding of the gas–liquid gravity displacement in carbonate formations.

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A Study on the Formation and Removing Mechanisms of a Gas Hydrate Slug in Gas Pipelines

Cited by 3 publications

References 5 publications

Gas Hydrate Formation and Slurry Flow Characteristics of Gas–Liquid–Solid Multiphase Systems

Gas Hydrate Formation and Slurry Flow Characteristics of Gas–Liquid–Solid Multiphase Systems

Kinetics of Hydrate Formation and Dissociation in Coal at Different Temperatures Based on Impedance Method

Numerical Simulation of Gas–Liquid Gravity Displacement in Vertical Fractures during Drilling of Carbonate Formations

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