Stability Study Of Natural Gas Hydrate Reservior

Gas hydrate is a ice-like crystalline compound, formed by water molecules and natural gas molecules under certain temperature and pressure conditions, also called clathrate hydrate or"fire ice". For the gas forming gas hydrate is mainly methane, it is also called methane hydrate. Natural gas hydrate distributes mainly in the marine continental margin sediments and permafrost environments, and most of found gas hydrate existed in the former. Natural gas hydrate has many merits, such as high energy density, wide distribution, abundant resource, shallow buried and so on. It is recognized the most prospective energy in the 21st century. So the research about exploitation of natural gas hydrate is very important significant.Based on analyzed thermal physical and mechanics properties of natural gas hydrate and its formation, and discussed mechanical regime of stability of bore well in gas hydrate formation, its influencing factor and stabilization technique in detail with reference to the theory and method of oil and gas well bore stability. The author analyzed the characteristics of dissociation of gas hydrate in porous medium and the intrusion of drilling fluid into gas hydrate formation, and coupled the dynamic equation of gas hydrate dissociation to the multi phase seepage flow equation of oil and gas, and established the seepage flow model of intruding of drilling fluid into gas hydrate formation with gas hydrate dissociation. Then consider the infection of the seepage to the stress of well-week, analysis the stability of gas hydrate formation. At last, we have a p??ry research abort the relationship between gas hydrate and coastal landslide.