Stress solutions for short- and long-term wellbore stability analysis

Liu, Chao; Han, Yanhui; Phan, Dung; Abousleiman, Younane N.

doi:10.1016/j.jngse.2022.104693

Cited by 11 publications

(1 citation statement)

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“…Because of the shallow burial depth, weak cementation, instability, and lack of dense caprock of marine gas hydrates, the drilling window of hydrate production wells is narrow [16,17]. In contrast to traditional oil and gas reservoirs, the temperature change of the drilling fluid in the wellbore has a greater impact on the stability of the wellbore in the hydrate reservoir section [18][19][20][21]. Many scholars have performed a series of studies on the stability of hydrate reservoirs during drilling and have obtained some general understanding.…”

Section: Introductionmentioning

confidence: 99%

Study on the Evolution Law of Wellbore Stability Interface during Drilling of Offshore Gas Hydrate Reservoirs

Li,

Sun,

et al. 2023

Energies

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The study of wellbore stability in offshore gas hydrate reservoirs is an important basis for the large-scale exploitation of natural gas hydrate resources. The wellbore stability analysis model in this study considers the evolution of the reservoir mechanical strength, wellbore temperature, and pressure parameters along the depth and uses plastic strain as a new criterion for wellbore instability. The wellbore stability model couples the hydrate phase transition near the wellbore area under the effect of the wellbore temperature and pressure field and the ‘heat–fluid–solid’ multifield evolution characteristics, and then simulates the stability evolution law of the wellbore area during the drilling process in the shallow seabed. The research results show that, owing to the low temperature of the seawater section and shallow formation, the temperature of the drilling fluid in the shallow layer of the wellbore can be maintained below the formation temperature, which effectively inhibits the decomposition of hydrates in the wellbore area. When the wellbore temperature increases or pressure decreases, the hydrate decomposition rate near the wellbore accelerates, and the unstable area of the wellbore will further expand. The research results can provide a reference for the design of drilling parameters for hydrate reservoirs.

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