Establishment and analysis of temperature field of riserless mud recovery system

Zhang, Jie; Li, Xin; Xu, Tianhan; Luo, Wen

doi:10.2516/ogst/2018100

Cited by 10 publications

(3 citation statements)

References 14 publications

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“…The limit water depth of riser used in offshore drilling engineering is 3,047m [1][2][3]. However, due to the impact force of seawater, the riser will vibrate at different frequencies, which makes it impossible for the riser to be used ideally in a deepwater environment [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2024

PPEJ

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The precise control of the annular pressure involves drilling safety and drilling cost, which have always been the focus of drilling engineering. In this paper, combined with the characteristics of the Riserless Mud Recovery (RMR) System, the calculation method of equivalent circulating density (ECD) and annulus pressure of the RMR system is proposed. According to the characteristics of the heat exchange of the RMR system, a mathematical model of the thermal field in the annular is established. The variation law of thermal field in the annular of some well sections was simulated by computational fluid dynamics (CFD) software. Comparing the CFD analysis results with the calculation results of mathematical models, the feasibility of the mathematical model is verified, and the temperature variation curve in the annulus is obtained. Based on the drilling data of a vertical well in the South China Sea, this paper analyzes the effects of seawater depth, equivalent static density (ESD) of drilling fluid, cuttings concentration, and discharge capacity on the annular pressure and ECD of the RMR system.

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Section: Introductionmentioning

confidence: 99%

Untitled

2024

PPEJ

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“…As the depth of CBM exploitation gradually deepens, the formation temperature will become higher and higher, and the circulation time of the fluid in the wellbore will become longer and longer. During the circulation process, the wellbore fluid will exchange heat with the surrounding rock through convective heat exchange and heat conduction (Zhang et al 2019;Li et al 2020). The surrounding rock is affected by the effect of thermal expansion and contraction, and its mechanical properties will inevitably change, which will have a specific impact on the exploitation process.…”

Section: Introductionmentioning

confidence: 99%

Variation characteristics of coal-rock mechanical properties under varying temperature conditions for Shanxi Linfen coalbed methane well in China

Zhang

et al. 2021

J Petrol Explor Prod Technol

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In the actual exploitation process of coalbed methane (CBM), as the fluid in the wellbore continues to circulate, the surrounding rock of the CBM well will continuously exchange heat with the fluid in the wellbore, resulting in continuous changes in the temperature of the surrounding rock itself. Linfen, Shanxi is the main exploitation area for CBM in China. This paper aims further to improve the exploitation efficiency of CBM in this area and conducts experimental research on the change characteristics of coal-rock mechanical properties under varying temperature conditions. The experimental results show that under constant pressure conditions, the higher the temperature, the lower the stress value when the coal-rock breaks. In the process of reaching peak strength, the higher the temperature, the higher the proportion of coal-rock plastic deformation in its entire deformation stage. The compressive strength, elastic modulus, and main crack length of coal-rock will decrease with temperature. The Poisson's ratio and primary fracture angle will increase with the increase of experimental temperature.

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“…Gas kick and well-killing are the main concerns of well control during the drilling of oil and gas fields. Various multiphase flow models have been proposed to predict the flow pattern distribution in the wellbore after gas kick (Amaya-Gómez et al, 2019;Ansari et al, 1994;Bilicki and Kestin, 1987;Ebrahimi and Khamehchi, 2015;Feng et al, 2015;Guo et al, 2018;Hasan and Kabir, 1988;Kelessidis and Dukler, 1989;Li and Mouline, 1997;Zhang et al, 2019); among them, the most widely used in drilling engineering are the patterns of bubble, slug, churn, and annular flows (Osman, 2004;Raghavan, 1989;Sun et al, 2017). On the basis of these studies, many researchers have focused on the multiphase flow in the wellbore under different conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamical well-killing simulation of a vertical H₂S-containing natural gas well

Mao

Cai

Liu

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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This work aims to explore the dynamical well-killing process of a vertical H2S-containing natural gas well. A dynamical well-killing model considering an H2S solubility was established to simulate the overflow and well-killing process of a vertical H2S-containing natural gas well. The mass and momentum equations of the coupled model were solved using finite difference method, while the transient temperature prediction model was solved using finite volume method. The coupled model was validated by reproducing experimental data and field data of Well Tiandong #5. The effect of H2S content, mud displacement, drilling fluid density, and initial overflow volume on the dynamical well-killing process of an H2S-containing natural gas well were obtained and analyzed in this work. Results showed that H2S will gasify near wellhead during well killing when casing pressure decreases. To balance the bottom hole pressure, when H2S releases, the casing pressure increases as H2S content increases. As initial overflow volume increases, the annular temperature, annular pressure and the casing pressure increase significantly. When H2S gasifies, the casing pressure applied at wellhead should be higher at lower initial overflow volume to balance bottom hole pressure. In the well-killing process, the annular pressure and temperature decrease as drilling fluid density increases and a lower casing pressure is needed for balancing bottom hole pressure. The casing pressure is lower at a higher displacement for higher friction resistance. Besides, as well-killing displacement increases H2S will gasify at an earlier time. When drilling for H2S-containing natural gas well, early detection of gas kick should be more frequent to avoid severe overflow. Besides, higher displacement and density of drilling fluid should be considered to avoid stratum fracturing and prevent leakage accidents under the premise of meeting drilling requirements.

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Establishment and analysis of temperature field of riserless mud recovery system

Cited by 10 publications

References 14 publications

Untitled

Untitled

Variation characteristics of coal-rock mechanical properties under varying temperature conditions for Shanxi Linfen coalbed methane well in China

Dynamical well-killing simulation of a vertical H₂S-containing natural gas well

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Establishment and analysis of temperature field of riserless mud recovery system

Cited by 10 publications

References 14 publications

Untitled

Untitled

Variation characteristics of coal-rock mechanical properties under varying temperature conditions for Shanxi Linfen coalbed methane well in China

Dynamical well-killing simulation of a vertical H2S-containing natural gas well

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Dynamical well-killing simulation of a vertical H₂S-containing natural gas well