Analysis of subsidence patterns of the formation around the wellbore during deepwater natural gas hydrate test production conditions

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN Applied Ocean Research Pub Date : 2024-10-08 DOI:10.1016/j.apor.2024.104257
Chao Fu , Jin Yang , Yang Long , Qishuai Yin , Lei li , Zhiqiang Hu , Minghe Zhang , Mengjie Lu , Xiao Li , Zhangxing (John) Chen , Huizhen Ma
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Abstract

Deep-water natural gas hydrates are commonly found in muddy siltstone at shallow seabed depths. The land subsidence caused by the continuous dissociation of hydrate can influence the stability of the subsea wellhead and facilities. The analysis of formation subsidence pattern around wellbore is helpful to avoid the risk of field operation. A multi-field coupled model for hydrate extraction experiments was established, considering the coupling effects of seepage, mechanical, thermal, and chemical fields based on the storage characteristics of hydrates and the properties of submarine soils. Based on the formation physical parameters and wellbore parameters of the Shenhu area in the South China Sea, a numerical simulation method was used to analyze the formation subsidence pattern around the wellbore under hydrate production test conditions, and a sensitivity analysis of subsidence factors was completed. According to the subsidence patterns obtained, combined with the field operation conditions, the hazardous loads on the conductor throughout its lifecycle during the hydrate production test process were analyzed. A design method for the minimum mud depth of the conductor under hydrate production test conditions was provided. The study of seabed subsidence patterns during natural gas hydrate production tests in deep-water sea is helpful in reducing the instability risk of subsea wellheads and ensuring operation security, which provides a certain of reference for the design of natural gas hydrate production test engineering.
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深水天然气水合物试采条件下井筒周围地层下沉模式分析
深水天然气水合物通常存在于浅海海底的泥质粉砂岩中。水合物不断解离造成的陆地沉降会影响海底井口和设施的稳定性。对井筒周围地层下陷模式的分析有助于规避油田作业风险。根据水合物的存储特性和海底土壤的属性,考虑渗流、机械、热和化学场的耦合效应,建立了水合物提取实验的多场耦合模型。根据南海神狐地区的地层物理参数和井筒参数,采用数值模拟方法分析了水合物开采试验条件下井筒周围地层的下沉规律,并完成了下沉因素的敏感性分析。根据得到的下沉规律,结合现场作业条件,分析了水合物生产试验过程中导体在整个生命周期内的危险载荷。提供了水合物生产试验条件下导体最小泥浆深度的设计方法。对深水海域天然气水合物生产试验过程中海底沉降规律的研究,有助于降低海底井口失稳风险,确保作业安全,为天然气水合物生产试验工程设计提供了一定的参考。
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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
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