On the static mechanics of the tubular system during installation of the surface casing in deepwater drilling

Wang, Yanbin; Gao, Deli

doi:10.1016/j.apor.2021.102599

Cited by 5 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally speaking, a wellhead system will remain stable under the combined action of lateral and axial loads [12]. Lateral loads mainly consist of ocean current force and the lateral force exerted by the surrounding sediment on the casing [13]. On the other hand, the composition of axial loads is complex.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Insight into Ice Melting, Surface Subsidence, and Wellhead Instability during Oil and Gas Extraction in Permafrost Region

Zhou,

Su,

Cheng

et al. 2024

Energies

View full text Add to dashboard Cite

Oil and gas production in permafrost can effectively alleviate energy tensions. However, ice melting around wellbores and the accompanying wellhead instability affect the efficiency and safety of oil and gas development in permafrost. Moreover, the potential oil and gas leakage will damage the environment and the ecology of permafrost. Unfortunately, ice melting, formation subsidence, and wellhead behavior during this process have rarely been investigated in previous studies. In the present work, mechanical properties of permafrost were first experimentally investigated, which provided the basic parameter for subsequent numerical simulation. It was found that the ultimate strength gradually increased with the decreasing temperature, as well as the increasing confining pressure. Meanwhile, although the elastic modulus increased with decreasing temperature, it was less affected by confining pressure. Unlike other parameters, the Poisson’s ratio was hardly affected by temperature and confining pressure. Moreover, both the internal friction angle and the cohesion increased with decreasing temperature, but the influence degree varied within different temperature ranges. Then, ice melting, formation subsidence, and the instability behavior of the wellhead caused by the disturbance of the development operation were numerically explored. The investigation results show that the ice melting range in the reservoir section reached 8.06 m, which is much wider than that in other well sections. Moreover, failure of the cement–permafrost interface, caused by ice melting, resulted in a wellhead sinking of up to 1.350 m. Finally, the insulation effect of the vacuum-insulated casing showed that the temperature drop of the designed vacuum-insulated casing was much lower than that of the ordinary casing. When the fluid temperature within the wellbore was 70 °C, the temperature drop of the designed vacuum-insulated casing was 3.54 °C lower than that of the ordinary casing. This study provides support for maintaining wellhead stability during oil and gas extraction in permafrost for avoiding some environmental disasters (such as oil and gas leakage).

show abstract

Section: Introductionmentioning

confidence: 99%

Preliminary Insight into Ice Melting, Surface Subsidence, and Wellhead Instability during Oil and Gas Extraction in Permafrost Region

Zhou,

Su,

Cheng

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…Chen et al [24] established an analysis method to determine the safe operation window of the deepwater riser based on the allowable offset of the drilling platform in different directions. Wang et al [25][26][27][28][29][30][31] established a systematic analysis method for the mechanical behavior of the deepwater drilling riser under complex marine environments and drilling loads, which provided a scientific basis for the design and control of the deepwater drilling riser. The mechanical analysis on the riser system, including static analysis, vibration analysis, and recoil analysis, is related to the resilience issue.…”

Section: Introductionmentioning

confidence: 99%

Influence of Auxiliary Pipelines of the Deepwater Drilling Riser on the Dynamic Characteristics of the Subsea Wellhead

Wang,

Gao

et al. 2023

JMSE

Self Cite

View full text Add to dashboard Cite

During deepwater drilling, the subsea wellhead will be subjected to dynamic loads transmitted from the marine environment, floating drilling platform, riser, and blowout preventer (BOP). Therefore, complex dynamic responses will be induced, which will seriously affect the safety of the subsea wellhead. In this paper, considering the effect of auxiliary pipelines on the riser, a novel entire mechanical model of the floating platform–riser–BOP–subsea wellhead is established. By using the finite-difference method, the governing equations are solved. Finally, the dynamic bending moment and stress distribution of the subsea wellhead are obtained. Moreover, the model is verified by numerical simulation in Orcaflex. On this basis, the influence of the wave height, wave period, sludge height of the subsea wellhead, rotational stiffness of the lower flexible joint, and wall thickness of the conductor on the dynamic characteristics of the subsea wellhead is discussed. Analysis results show that the theoretical analysis results are in good agreement with the numerical simulation. The auxiliary pipelines have important influence on the dynamic characteristics of the subsea wellhead. Wave period is the most important factor affecting the mechanical behavior of the subsea wellhead. Wave height, wall thickness of the conductor, and sludge height are secondary factors affecting the mechanical behavior of the subsea wellhead. The rotational stiffness of the lower flexible joint has little influence on the mechanical behavior of the subsea wellhead. By solving the optimized mechanical model proposed in this paper, the dynamic characteristic of the subsea wellhead conforms more to the actual deepwater drilling conditions. This study has reference significance for the design and mechanical control of the subsea wellhead in deepwater drilling.

show abstract

Development and sea trial investigation for deepwater drilling riser specialized soft hang-off system during transit

Xu¹,

Wang²,

et al. 2022

Ocean Engineering

View full text Add to dashboard Cite

On the static mechanics of the tubular system during installation of the surface casing in deepwater drilling

Cited by 5 publications

References 8 publications

Preliminary Insight into Ice Melting, Surface Subsidence, and Wellhead Instability during Oil and Gas Extraction in Permafrost Region

Preliminary Insight into Ice Melting, Surface Subsidence, and Wellhead Instability during Oil and Gas Extraction in Permafrost Region

Influence of Auxiliary Pipelines of the Deepwater Drilling Riser on the Dynamic Characteristics of the Subsea Wellhead

Development and sea trial investigation for deepwater drilling riser specialized soft hang-off system during transit

Contact Info

Product

Resources

About