Hydrocarbon Phase Prediction of Ultra-Deep Zheng 10 Well in Central Junggar Basin, NW China

The exploration of ultra-deep oil and gas is a major problem in the world, which is influenced by many factors such as high temperature and high pressure. After geological exploration, it is found that the super deep oil and gas resources are abundant. Therefore, it is very important to explore the super deep oil and gas resources for the oil and gas exploitation. Well Zheng 10 is located in the ultra-deep oil and gas well in the middle of Junggar Basin. Large quantities of recoverable oil and gas have been found in other nearby depressions, which has excellent oil and gas exploration potential. In this paper, the empirical method and phase diagram method are used to evaluate the well. The total oil color quality method and three-component method show that the well belongs to Condensate oil gas or condensate gas reservoir. At the same time, the PVT experiment was used to carry out phase experiments. The results show that the critical temperature of oil and gas in well Benzhen10 is −116.87 ℃ and the critical pressure is 24.41 MPa. The positions of critical temperature (Tc), critical condensate temperature (Tm) and critical condensate pressure (Pm) are significantly different, and there is a Tc–Pm–Tm sequence. In other words, the temperature of the condensate pressure point at the critical point exceeds the critical point temperature, while the temperature of the condensate temperature is less than the critical point. Combined with the characteristics, it can be said that the well has typical characteristics of condensate gas reservoir.