In-Situ Thermal Insulation and Pressure Preservation Sampling Technologies for Deepwater Natural Gas Hydrate

FU Chenghang; ZHAO Le; CHEN Ling; XU Meng; WU Han; QIN Botao; XIE Heping

doi:10.11911/syztjs.2025063

Volume 53 Issue 3

Jun. 2025

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Petroleum Drilling Techniques > 2025 > 53(3): 146-155. > DOI: 10.11911/syztjs.2025063

FU Chenghang, ZHAO Le, CHEN Ling, et al. In-situ thermal insulation and pressure preservation sampling technologies for deepwater natural gas hydrate [J]. Petroleum Drilling Techniques, 2025, 53(3)：146−155. DOI: 10.11911/syztjs.2025063

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In-Situ Thermal Insulation and Pressure Preservation Sampling Technologies for Deepwater Natural Gas Hydrate

1.
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
2.
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China

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Received Date: March 23, 2025
Revised Date: April 16, 2025
Accepted Date: May 19, 2025
Available Online: May 25, 2025

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Abstract

Abstract

In view of the difficulty in maintaining in-situ temperature and pressure during sampling of deepwater natural gas hydrates, based on the geometric principle of the Steinmetz solid, materials resistant to high pressure, low temperature, seawater corrosion, and fatigue and with a long service life were selected. An in-situ self-triggering pressure preservation controller for marine deep water was developed to achieve stable sample pressure during the sampling process of deepwater hydrates. Based on the fundamental principles of heat transfer, a variety of active and passive thermal insulation technologies were developed. By using a self-developed temperature control system and coupling three thermal insulation schemes, namely semiconductor refrigeration, phase change-based latent heat energy storage, and hollow microsphere composite materials, a new type of composite thermal insulation technology was formed, which met the thermal insulation requirements of samples during the sampling process of deepwater hydrates. Based on the research results of key tools and technologies for thermal insulation and pressure preservation sampling, a penetrating in-situ thermal insulation and pressure preservation sampler for deepwater natural gas hydrates was developed. Two sea trial operations were completed using manned deep-sea submersibles, and samples of deepwater sediments (natural gas hydrates) maintaining in-situ temperature and pressure were successfully obtained in both cases. The research result provides key technical support for the safe and efficient development of deepwater natural gas hydrates. It will also strongly promote scientific research and engineering practice in the field of in-situ thermal insulation and pressure preservation in deep water.
- natural gas hydrate,
- in-situ pressure preservation,
- in-situ thermal insulation,
- deepwater sampling,
- sampler,
- field test

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References

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In-Situ Thermal Insulation and Pressure Preservation Sampling Technologies for Deepwater Natural Gas Hydrate

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