TY - JOUR
TI - Foam drilling in natural gas hydrate
AU - Wei Na
AU - Meng Ying-Feng
AU - Li Gao
AU - Guo Ping
AU - Liu Yan-Qin
AU - Xu Tian
AU - Sun Wan-Tong
JN - Thermal Science
PY - 2015
VL - 19
IS - 4
SP - 1403
EP - 1405
PT - Article
AB - The key problem of foam drilling in natural gas hydrate is prediction of  characteristic parameters of bottom hole. The simulation shows that when the  well depth increases, the foam mass number reduces and the pressure  increases. At the same depth, pressure in drill string is always higher than  annulus. The research findings provide theoretical basis for safety control.