Multiphase flow behavior for acid-gas mixture and drilling fluid flow in vertical wellbore

Sun, Baojiang; Guo, Yanli; Sun, Wenchao; Gao, Yonghai; Li, Hao; Wang, Zhiyuan; Zhang, Hongkun

doi:10.1016/j.petrol.2018.02.016

Cited by 25 publications

(13 citation statements)

References 24 publications

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“…To evaluate the operating stability of the dynamic anaerobic digestion system, an operating energy efficiency analysis of the MFD was carried out. The energy efficiency ratio (EER) of the system can be calculated using Equation (20):…”

Section: System Operating Energy Efficiency Analysis and Key Future Rmentioning

confidence: 99%

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Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Guo

Zhou

et al. 2019

Energies

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Traditional static anaerobic digestion technology presents the disadvantages of a low gas production rate and long digestion cycle, which is not conducive to the treatment of livestock manure. A 12 m3 multiphase flow anaerobic digester (MFD) was developed in this study to improve the biogas production rate and maintain constant temperature digestion during winters. Full-scale field experiments were conducted on the biogas production rate at different temperatures, the dynamic digestion effects, and the dynamic heating digestion effects of the system at Sichuan, China. A comparison of the dynamic and static digestion results of 50 days indicated that the biogas production for the dynamic digestion (DD) group was 115.22 m3 or 127.1% higher than that of the static digestion (SD) group with the same digestion temperature. The results of the heat transfer performance experiment revealed that the heat transfer rate of the system increased significantly, and the temperature of the biogas slurry increased rapidly. The optimization analysis of the system was based on the experimental results of the relationship between the slurry temperature and biogas production rate, and the economical digestion temperature of the system was proposed and calculated. Different insulation materials or insulation thicknesses have an influence on the economical digestion temperature. Additionally, the economical digestion temperature of the system in which the polystyrene insulation layer with a thickness of 90 mm was used, was found to be 27.2 °C. When digestion temperature was 22.3 °C, the energy efficiency ratio (EER) of dynamic anaerobic digestion system is 1. The advantages of MFD are low biogas production unit cost and high heat and mass transfer rate. However, the disadvantage of high operation energy consumption needs further improvement. And additional energy was required when system digestion temperature below 22.3 °C. The proposed MFD and dynamic anaerobic digestion system can play a significant role in using biomass resources and promoting the development of biogas projects.

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Section: System Operating Energy Efficiency Analysis and Key Future Rmentioning

confidence: 99%

“…Multiphase flow technology is a mature industrial technology that is widely used in many fields such as the petrochemical, power, and metallurgical fields, among others [20,21]. This solves the problem of fluidity in traditional industries, which transforms solid particles into "quasi-fluids" with "fluid properties".…”

Section: Introductionmentioning

confidence: 99%

Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Guo

Zhou

et al. 2019

Energies

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“…In case of a gas‐liquid two‐phase flow, the friction pressure drop can be calculated based on the following equations established by Sun et al…”

Section: Multiphase Flow Modelmentioning

confidence: 99%

“…However, a typical method is only based on the gas‐liquid two‐phase flow for the wellbore multiphase flow simulation, which may lead to a high data error for the flow simulation of an H 2 S‐containing natural gas well. Based on earlier studies, Sun et al investigated the phase change in acid‐gas mixture considering the H 2 S content in a wellbore through experimental analysis and highlighted that the acid‐gas mixture in the supercritical phase exists at certain wellbore temperature and pressure, resulting in an abrupt change in its physical properties near the critical point. Sun et al also established a multiphase flow model with consideration of the phase transition and the solubility of the H 2 S components in the natural gas and found that the solubility of natural gas with H 2 S content of 100% is 130 times that of natural gas with H 2 S content of 0%.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have focused on the change in H 2 S solubility along the wellbore and the variation in gas volume before and after H 2 S gasification was also studied. However, when H 2 S is released, the gas volume increases abruptly; the multiphase flow behavior is influenced; and the flow pattern distribution in the annulus, pit gain, annular pressure distribution, and bottom hole pressure will be greatly affected accordingly, which have a great impact on well control operations such as overflow monitoring and well killing in drilling engineering.…”

Section: Introductionmentioning

confidence: 99%

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Research on dynamical overflow characteristics of a vertical H₂S‐containing natural gas well

Mao

Cai

Liu

et al. 2019

Energy Science & Engineering

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This work aims to explore the overflow characteristics of a vertical H2S‐containing natural gas well. A two‐phase flow model for H2S‐containing natural gas well combining with a transient temperature prediction model was established to simulate the overflow process of a vertical H2S‐containing natural gas well. The model was validated by reproducing the field data of Well Longhui #2. The effects of H2S content, mud displacement, drilling fluid density, geothermal gradient, and reservoir permeability on the overflow characteristics of a vertical H2S‐containing natural gas well were studied and analyzed in this work. Results indicate that bubble, slug, and churn flows constitute the main flow patterns in the whole overflow process. The higher the H2S content is, the more obviously the gas void fraction increases. The phase change position of H2S is closer to the wellhead at lower H2S content. An increase in mud displacement indicates the decreases in overflow time. As drilling fluid density increases, the release position of H2S moves up, and the overflow time and shut‐in casing pressure increase. The initial gas void fraction is higher and the gas invasion volume will be larger in gas reservoirs with higher permeability. As the reservoir permeability increases, the shut‐in casing pressure rises while the overflow time declines. With higher geothermal gradient, the wellbore temperature tends to be higher at the same depth, leading to an increase in the H2S solubility. The gasification starting position is further away from the wellhead at higher geothermal gradient. The results of this work could provide important theoretical basis and technical guidance for drilling engineers to reduce a blowout risk during drilling of H2S‐containing natural gas well.

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Experimental Investigations of Single Bubble Rising in Static Newtonian Fluids as a Function of Temperature Using a Modified Drag Coefficient

Liu

Wang

et al. 2019

Nat Resour Res

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Multiphase flow behavior for acid-gas mixture and drilling fluid flow in vertical wellbore

Cited by 25 publications

References 24 publications

Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Research on dynamical overflow characteristics of a vertical H₂S‐containing natural gas well

Experimental Investigations of Single Bubble Rising in Static Newtonian Fluids as a Function of Temperature Using a Modified Drag Coefficient

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Multiphase flow behavior for acid-gas mixture and drilling fluid flow in vertical wellbore

Cited by 25 publications

References 24 publications

Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Research on dynamical overflow characteristics of a vertical H2S‐containing natural gas well

Experimental Investigations of Single Bubble Rising in Static Newtonian Fluids as a Function of Temperature Using a Modified Drag Coefficient

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Product

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Research on dynamical overflow characteristics of a vertical H₂S‐containing natural gas well