Optimization strategies of production parameters to prevent hydrate reformation in marine gas hydrate production system

Optimization strategies of production parameters to prevent hydrate reformation in marine gas hydrate production system

Natural gas

Natural gas transportation

Gas hydrates

Pipelines

Temperature

Hydration

Offshore oil well production

Gases

In recent decades, the development of natural gas hydrates has become a research hotspot of scholars all over the world. However, the decomposed gas and water in marine gas hydrate production system may regenerate gas hydrates due to the low-temperature and high-pressure environment in seafloor. In this study, a transient temperature and pressure calculating model was established to predict the risk of hydrate reformation in production pipelines during offshore natural gas hydrate development. Using the proposed model, the region of hydrate reformation in gas hydrate production wells were predicted quantitatively. Meanwhile, the hydrate reformation management strategies through optimization of production design parameters in combination with hydrate inhibitor injection were proposed and discussed in detail. The results indicate that the risk of hydrate reformation is the highest in the drainage pipeline (DP)

however, the flow in gas-water mixed transportation and gas production pipelines (MTP and GPP) basically does not satisfy the hydrate formation condition. In the process of production well design, adding additional the EH and ESP can fully eliminate the hydrate reformation risk in the DP without using the hydrate inhibitor. 2021, Society of Petroleum Engineers.

SPE/IATMI Asia Pacific Oil and Gas Conference and Exhibition 2021, APOG 2021, October 12, 2021 - October 14, 2021

2021

Liu, Zheng

Sun, Baojiang

Wang, Zhiyuan

Zhang, Jianbo

conferencePaper

10.2118/205695-MS