Abstract: High pour point crude with the features such as high freezing point and poor flowing ability resulted in poor economic performance when producing in this kind of reservoirs, so a new cold production method through mixing light oil by commingling was developed for high pour point reservoirs, which integrates the techniques such as wellbore thermal conduction, mixing light oil to increase liquid production rate and lowering pour point and considers the factors of formation temperature, liquid production rate, mixing ratio and operating parameters of wells. The sensitivity of the above mentioned factors was also analyzed. The results show that liquid rate and wellhead temperature could be increased through mixing light oil and wellhead temperature would be high enough when liquid rate was above 60 m³/d. Pour point of crude would be decreased a lot when ratio of light oil over liquid rate was over 60%. Fluid level affected temperature loss apparently, and wellhead temperature would keep high if fluid level was deeper than 1 000 meters. The technology was applied in G oilfield and achieved good results that cumulative oil of 3.16×10⁴ m³ in one producer which were unavailable by conventional method was produced within 1.5 years. The research shows that the method presented above could be used successfully in producing oilfields with both light oil and high pour point oil based on optimizing liquid rate, mixing ratio and operating parameters of producers, and it will be good reference for the development of the same kind of reservoirs.

Key words: thick gas reservoirs, pseudo-steady state deliverability, perforating degree, non-Darcy effect