Research On Waste Heat Utilization Technology For Adopting SAGD Technology Exploiting Heavy Oil

To further enhance heavy oil recovery and ensure stable oil field exploitation, Liaohe Oilfield in China adopted SAGD technology to exploit heavy oil for the first time. Although the implementation of SAGD technology has overcame oil exploitation barrier and succeeded in maintaining constant oil field exploitation, the followed problem is wellhead produced fluid temperature researched up to 170-180℃with much heat wasted. Regarding to the problem above, this paper makes deep research in several aspects. The main works are as follows:1,Based on waste heat utilization method at home and abroad, a set of technical program of cascading use of waste heat is proposed in SAGD oil zone with the combination of generation of electrical energy and direct use.2,In the waste heat power generation system program, R134a is selected as the cycle refrigerant. Based on the theory of thermodynamics, the operating parameters of power generation system are determined; thermodynamic parameters of the turbine are calculated; generating capacity of the system is obtained.3,From the aspect of heat transfer theory in condenser, the parameter calculation program is compiled using MATLAB software, and then the impact of the design parameters on the performance parameters of the condenser is analyzed. On the basis of that, the parameters of condenser are optimized by taking the annual total cost of the condenser as the objective function; optimization model is established using MATLAB software; the most superior technical parameters are determined.4,In the directly use heat program, the number of heat exchangers required in the secondary preheating boiler feed water and the heat of production sectors for heating needed are calculated.5,The economy and environmental protection of SAGD waste heat recovery program are analyzed.