Abstract:

It is very important for natural gas exploration and development to study the NM R properties of natural gas in a low magnetic field. Few studies have been
reported on this subject mainly due to the restriction of high temperature and h igh  pressure. In this work, a home-made NMR instrument, which could bear both high temperature and high pressure, was developed. The magnetic field is 0.056Tesla. The NMR properties of natural gas from deep formation of Daqing oil field were ex plored. The relationships among relaxation time, hydrocarbon factor, temperat ure, and pressure were extracted, resulting in useful information in the application o f NMR logging.

Key words: NMR relaxation, Hydrocarbon factor, Natural gas