Risk Assessment Method of Subsea Wellhead Instability in Consideration of Uncertain Factors in Deepwater Drilling

Xu, Yuqiang; Guan, Zhichuan; Jin, Yan; Liu, Yongwang; Sun, Yuanxiu; Zhang, Bo; Sheng, Yanan

doi:10.1007/s13369-017-3004-2

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…The equivalent stress of the first surface conduit of the underwate head is checked, respectively, when the wellhead is not tilted and tilted at different a and the maximum displacement of the platform under the basis of safe operation tained [156]. Zhou Rongxin et al established the mechanical analysis model of the s Yuqiang Xu et al carried out stress and strain analysis on the subsea wellhead system, and at the same time, based on dimensionless processing and sensitivity analysis, the factors that have a greater impact on the wellhead stability were obtained [153]. Su Kanhua et al analyzed the overall force of the subsea wellhead system for deep-water drilling, established the wellhead mechanical stability analysis method, and determined the influencing factors affecting the stability of the subsea wellhead [154].…”

Section: Wellbore Integrity Assessmentmentioning

confidence: 99%

An Interface Parametric Evaluation on Wellbore Integrity during Natural Gas Hydrate Production

Zheng

Yang

Zhang

et al. 2022

JMSE

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Based on the whole life cycle process of the economic exploitation of natural gas hydrate, this paper proposes the basic problem of stabilizing the wellbore for the basic conditions that must be met to ensure the integrity of the wellbore for exploitation: revealing the complex mechanism of fluid–solid–heat coupling in the process of the physical exchange of equilibrium among gas, water, and multiphase sand flows in the wellbore, hydrate reservoir, and wellbore, defining the interface conditions to ensure wellbore stability during the entire life cycle of hydrate production and proposing a scientific evaluation system of interface parameters for wellbore integrity.

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Section: Wellbore Integrity Assessmentmentioning

confidence: 99%

An Interface Parametric Evaluation on Wellbore Integrity during Natural Gas Hydrate Production

Zheng

Yang

Zhang

et al. 2022

JMSE

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“…On the other hand, the composition of axial loads is complex. The important components are the buoyant weight of the wellhead system, the lateral support force, and the tip support force between the sediments and the casing [14]. If the loads applied to the wellhead system exceed the bearing capacity of the surrounding sediments, instability of the wellhead system can occur.…”

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

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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).

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“…With continuous development, offshore oil and gas exploration and development technology has gradually expanded to deepwater and ultradeepwater wells. Compared with land or shallow water, the deepwater drilling environment is more complex and faces more technical problems. , In the process of deepwater drilling, the shallow wellbore strengthening problem has not been well solved due to the need to consider both practicality and economy. − …”

Section: Introductionmentioning

confidence: 99%

Properties of Bentonite Slurry Drilling Fluid in Shallow Formations of Deepwater Wells and the Optimization of Its Wellbore Strengthening Ability While Drilling

et al. 2022

ACS Omega

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Offshore oil- and gas-field development is shifting from shallow water to deepwater on a large scale. Deepwater shallow bentonite slurry drilling fluid has a single composition and a simple structure. Therefore, the bentonite slurry drilling fluid has been neglected for the shallow wellbore strengthening ability. Based on the shallow geological characteristics and bentonite hydration mechanism, considering the economy and application effect, the optimization of bentonite slurry drilling fluid from four aspects of viscosity enhancement, adsorption, trapping, and physical plugging to carry out deepwater shallow wellbore strengthening research has been undertaken. For an indoor simulation of bentonite slurry and its drilling slurry-making process using a 2–10% mass concentration of bentonite slurry drilling fluid, laser particle size analysis found an interesting phenomenon different from the traditional understanding: for every 5% increase in particle size accumulation in the range of 0.1–100 μm, the bentonite slurry particle size increases linearly. Based on this interesting phenomenon, the basic performance of drilling fluids with different concentrations of bentonite slurry was evaluated. Experiments were conducted to introduce cationic emulsified asphalt as a deformation filler and to explore a new inexpensive drilling and wellbore strengthening material, AEH-P. The effectiveness of deepwater shallow strengthening was evaluated for AEH-P and cationic emulsified asphalt from both mechanistic and experimental aspects. It is obvious that the wellbore strengthening effect is the result of both particle settling and particle size matching. By exploring the relationship among bentonite slurry hydration dispersion, the charged nature, particle concentration, and the wellbore strengthening effect, a set of low-cost deepwater shallow bentonite slurry drilling fluids with a good wellbore strengthening effect are constructed. The research results provide a method to strengthen the wellbore for the subsequent fast and efficient drilling of deepwater shallow wells, further improving the drilling efficiency.

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Risk Assessment Method of Subsea Wellhead Instability in Consideration of Uncertain Factors in Deepwater Drilling

Cited by 10 publications

References 13 publications

An Interface Parametric Evaluation on Wellbore Integrity during Natural Gas Hydrate Production

An Interface Parametric Evaluation on Wellbore Integrity during Natural Gas Hydrate Production

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

Properties of Bentonite Slurry Drilling Fluid in Shallow Formations of Deepwater Wells and the Optimization of Its Wellbore Strengthening Ability While Drilling

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