Speaker: Yu Zhang

Date: Friday 26th of January 2024, 1:15pm.

Abstract:

Natural gas hydrate is regarded as a potential unconventional alternative clean energy with development prospects because of its huge reserves, high calorific value, and environmental protection. The Outline of China's Medium-and Long-Term Science and Technology Development Plan (2006-2020) clearly puts forward "breaking through the safe exploitation technology of natural gas hydrate"; China's 14th Five-Year Plan and the long-term goal outline for 2035 also put forward "trial production of natural gas hydrate in South China Sea and other areas". In the process of gas hydrate exploitation, the reservoir pores are in the state of gas hydrate solid-decomposed liquid-decomposed gas coexisting and filling, showing the characteristics of "high porosity, gas-water permeability and slightly low strength"; Macroscopic performance is reservoir compaction and wellbore collapse, and microscopic performance is pore structure and gas-water permeability evolution, which directly affects wellbore stability; The above problems are bottlenecks faced by efficient exploitation of natural gas hydrate