Subsea wellhead stability study of composite casing for deepwater drilling

Li, Wenlong; Gao, Deli; Yang, Jin; Hu, Zhiqiang; Abimbola, Fatai Akorede

doi:10.1016/j.oceaneng.2020.107780

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…The bending moment, shear force, and tension are usually extracted from the decoupled model of the structures between the LFJ and the upper flexible joint (UFJ) or a floating unit/vessel [6,12,13,14,26]. The wellhead constructors are modeled as linear elastic piles, and the interaction between the piles and the seabed soil is modeled as a pipe-soil coupled model.…”

Section: Wellhead and Casing Couplingmentioning

confidence: 99%

“…During drilling operations, the wellhead system and top casings are designed to support dynamic loads from the connected riser via the blowout preventer (BOP) and/or lower marine riser package (LMRP) [1,2]. The wellhead is easily and inevitably 2 damaged due to a variety of factors, including the low-cycle and huge loads transmitted through the global riser system and the soil-casing weak interaction (especially in soft or very soft seabed soils) [4,5,6]. Currently, many studies are focusing on the hydrodynamic characteristics of floating units, as well as the static and dynamic behaviors, strength, and stability of riser joints [7,8,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Grytøyr et al [4] provided an indirect measurement-based technique for estimating bending moments at the wellhead. Li et al [6] studied the stability of a composite subsea wellhead, considering the effects of cement, waiting time, and riser joint end-resistance force. Kavanagh et al [12] highlighted the analysis guidelines for modeling approaches of underwater wellhead systems and nonlinear subsea shallow soils.…”

Section: Introductionmentioning

confidence: 99%

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2022

Brodogradnja

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Deepwater subsea wellheads may be significantly threatened under extreme sea conditions and operations, especially when the seabed is composed of very soft clay properties. A numerical model of a deepwater wellhead system is established using the classic ocean pipe element and nonlinear spring element of ANSYS to examine the behaviors of subsea wellheads in diverse seabed soil. Nonlinear spring elements coded in the APDL language are used to model three types of seabed soils: very soft soil, soft soil, and firm soil. The dynamic and quasi-static behaviors of the wellhead system in the typical coupled and decoupled models of the drilling riser system are particularly investigated in depth. The effects of the nonlinear seabed soil properties on the detailed wellhead are realistically simulated using time domain and extremum analysis. The results show that the softer the seabed soil, the greater the displacement, rotation angle, curvature, and bending moment of deepwater subsea wellheads. When the seabed soil reaches a particular depth, the mechanical characteristics of the wellheads under the three types of seabed soil conditions are almost simultaneously close to zero. Overall, several conclusions reached in this study may provide some useful references for design and stability analysis.

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Section: Wellhead and Casing Couplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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2022

Brodogradnja

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“…The composite casing structure has better stability than the previous conventional jet conductors, and the composite casing composed of larger conductors has better stability and lower horizontal displacement and vertical load. Once the horizontal displacement profile is obtained, the bending moment, deflection angle, and shearing force profiles can be calculated as follows (see Figure 10) [152]:…”

Section: Wellbore Integrity Assessmentmentioning

confidence: 99%

“…Eng. 2022, 10, x FOR PEER REVIEW 2 conductors has better stability and lower horizontal displacement and vertical load the horizontal displacement profile is obtained, the bending moment, deflection and shearing force profiles can be calculated as follows (see Figure 10) [152]:…”

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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Technological Process of the Composite Casing Drilling Technology in Deep-Water Riserless well Construction

Wang

Long

et al. 2022

Chem Technol Fuels Oils

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Subsea wellhead stability study of composite casing for deepwater drilling

Cited by 8 publications

References 9 publications

Untitled

Untitled

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

Technological Process of the Composite Casing Drilling Technology in Deep-Water Riserless well Construction

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