Abstract: This paper presents the all-around investigation and analysis of production status, production capability and production level of associated gas in major fields of Tuha region, of which many methods are used to study the variation of associated gas and relations of production GOR to pressure and water cut, etc. These reliable parameters can be helpful to preparing the natural gas development plan of this region. Study shows that the GOR changes could be affected by the changes of formation pressure, recovery process and water cut in turn. Therefore, the scheme of production with keeping formation pressure should be unalterable.

Key words: Tuha oilfield, associated gas, GOR, variation, analysis