Full Transient Features of Heat Transfer and Sensitivities on Deep Water Wells

Song, Xun Cheng; Xu, Xiaowen; Hu, Sha; Guan, Zhi Chuan

doi:10.4028/www.scientific.net/amr.524-527.1423

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…A well in the gas field area of the South China Sea, with a water depth of 90 m. The maximum wind force is 12 degrees, and the wave height is generally 0.2~1 m. Based on the formulas of the Chinese Academy of Sciences and the Institute of Research and Levitus (Song et al, 2011), the temperature of the South China Sea water in the four seasons can be determined as shown in Fig. 5.…”

Section: Case Studymentioning

confidence: 99%

Mechanical Performance Analysis of High Pressure Wellhead Based on Thermodynamic Coupling Model

Li,

Wu,

Zhang

et al. 2023

Proceeding of the 33rd European Safety and Reliability Conference

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Due to the effect of harsh environmental factors and huge alternating moment loads, subsea wellhead system is prone to fatigue damage. The high pressure wellhead , as an important component and pressure-bearing part of the subsea wellhead, imposes higher requirements on its safety performance under the complex temperaturepressure coupling environment. A comprehensive assessment of the safety performance of key pressure-bearing components in subsea wellhead is crucial, but thermodynamic coupling factors are missing in performance analysis of traditional methods. This paper proposes a safety performance analysis method of the high pressure wellhead, which combines wellbore temperature distribution and location. A coupled finite element model is established for high pressure wellhead thermodynamically analysis, considering the effects of sensitive factors such as bending moment loads and temperature on safety performance. The approach is tested through the application to a case study with a subsea wellhead system in the South China Sea. The results show that the bending moment can cause greater equivalent stress on the pressure bearing components, and the impact on the locking ring is greater than the highpressure wellhead. Temperature has a particularly significant impact on the casing and locking ring. Compared to traditional subsea wellhead safety performance evaluation methods, the technique proposed can be used for a broader and more comprehensive evaluation of subsea wellhead safety performance, and is more suitable for guidance of practical engineering applications.

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Section: Case Studymentioning

confidence: 99%

Mechanical Performance Analysis of High Pressure Wellhead Based on Thermodynamic Coupling Model

Li,

Wu,

Zhang

et al. 2023

Proceeding of the 33rd European Safety and Reliability Conference

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“…One is to slow down the decomposition of the hydrate reservoir by adding hydrate decomposition inhibitors to the drilling fluid. The hydrate decomposition inhibitors will inhibit the decomposition of the hydrate reservoir to a certain extent, but the hydrate reservoir will still decompose continuously with the increases of the temperature of the drilling fluid. − Another method is for the crew to cool the drilling fluid on the platform to reduce the temperature difference between the drilling fluid and the gas hydrate reservoir to slow down the decomposition of the gas hydrate reservoir, but when the drilling fluid enters the wellbore, the temperature of the drilling fluid is no longer controllable. , Therefore, developing a material that can intelligently adjust the temperature of the drilling fluid inside the wellbore is of great significance for the safe extraction of NGH.…”

Section: Introductionmentioning

confidence: 99%

“…28−33 Another method is for the crew to cool the drilling fluid on the platform to reduce the temperature difference between the drilling fluid and the gas hydrate reservoir to slow down the decomposition of the gas hydrate reservoir, but when the drilling fluid enters the wellbore, the temperature of the drilling fluid is no longer controllable. 34,35 Therefore, developing a material that can intelligently adjust the temperature of the drilling fluid inside the wellbore is of great significance for the safe extraction of NGH.…”

Section: Introductionmentioning

confidence: 99%

Hydrate Decomposition Inhibitors by Phase Change Cooling Storage Based on an Electrostatic Spraying Method

Guo,

Wang,

Liao

et al. 2024

Energy Fuels

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The heat transfer of drilling fluid to hydrate reservoir is the main cause of reservoir hydrate decomposition and borehole wall instability. Impeding or retarding heat transfer from drilling fluid to hydrate reservoir is key to maintaining reservoir hydrate stability. In order to intelligently control the temperature of the drilling fluid in the wellbore, phase change microcapsules were prepared using an innovative method of electrostatic spraying and physical cross-linking with mixed alkane as the core material and sodium alginate as the shell material. This synthesis method can control the particle size of phase change microcapsules. The phase change microcapsules were characterized by SEM, optical microscopy, and particle size analyzer. The experimental results presented that the latent heat of melting of the phase change material is 158.04 J/g, and the latent heat of solidification is 161.63 J/g. In addition, the microcapsules also have excellent thermal stability, and the thermal conductivity coefficient is 0.384 W/(m•°C). The results of the hydrate decomposition experiment show that the phase change microcapsules can effectively delay the decomposition of hydrates. These results provide valuable insights into a better understanding of the rational development of high-performance hydrate decomposition inhibitors for drilling fluids and the construction of drilling fluid systems.

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An Analytical Model for Predicting Temperature Fields during Fluid Circulation in a Deep-Sea Well

Zhang

zhang³

et al. 2021

SPE Journal

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Summary Accurate prediction of temperatures along a well during deep-sea drilling (DSD) is significant for wellbore stability analysis. In this paper, an analytical model is developed to study the thermal behavior around wellbore during DSD. The analytical solutions for temperatures in the tubing, annulus, and formation are obtained in Laplace space, and their values in time domains are obtained by the numerical Stehfest method. A sensitivity study of temperature distribution under different injection temperature and rate, seawater depth, and wellbore length is carried out, and a comparison is made for the thermal behavior between onshore drilling and DSD. It is found that injection rate plays a dominate role in the bottomhole temperature (BHT), which decreases by more than 40°C after 6 months when it varies from 2 to 20 kg/s. Injection temperature only affects the temperature along wellbore at a depth less than 2000 m. There is large difference in the temperatures along the wellbore between DSD and onshore drilling. The difference in the temperature at the depth of seabed and bottomhole between the two cases reaches 80 and 70°C, respectively, after 1 day. In addition, the analytical model can work as a benchmark for other models predicting the thermal behaviors during DSD.

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Full Transient Features of Heat Transfer and Sensitivities on Deep Water Wells

Cited by 3 publications

References 12 publications

Mechanical Performance Analysis of High Pressure Wellhead Based on Thermodynamic Coupling Model

Mechanical Performance Analysis of High Pressure Wellhead Based on Thermodynamic Coupling Model

Hydrate Decomposition Inhibitors by Phase Change Cooling Storage Based on an Electrostatic Spraying Method

An Analytical Model for Predicting Temperature Fields during Fluid Circulation in a Deep-Sea Well

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