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Study on parameters of steam injection in SAGD circulating preheating section
LIN Riyi1,2, QI Shangchao1,3, SHEN Wenli4,5, YANG Jianping6, WANG Xinwei1, WANG Hongyuan6, WANG Shizhong6, SHU Zhengdong7
(1.College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China;2.Shandong Provincial Key Laboratory of Oil and Gas Storage & Transportation Safety in China University of Petroleum, Qingdao 266580, China;3.Power Department of Hengyi Industries SDN BHD,Hangzhou 311215,China;4.SINOPEC Engineering Incorporation, Beijing 100101,China;5.Arizona State University, Tempe 85281, USA;6.SAGD Development Project Management Department, PetroChina Liaohe Oilfield Company, Panjin 124010, China;7.No.1 Oil Production Plant, PetroChina Xinjiang Oilfield Company, Karamay 834000, China)
Abstract:
The circulation preheating effect of SAGD is an important factor affecting the development of SAGD Technology. The horizontal section is in direct contact with the reservoir, and it is easy to cause uneven heating of the horizontal section due to the unmatched steam injection parameters.Aiming at this problem, in this paper we put forward the optimization scheme of the steam injection parameter with the steam dryness not less than 0 when the steam returns to the point. The mathematical model of steam flow based on the real structures of column site and reservoir characteristicsis is established for steam cycle preheating. The finite difference method is used to solve the model, and the distributions of the steam pressure, dryness and heat dissipation along the wellbore are discussed. The influence of the steam injection rate and steam injection dryness on the preheating effect is discussed, and the optimum parameter chart of SAGD cyclic pre-heating with uniform heating and economy is obtained. The results show that the pressure drop and temperature drop along the wellbore mainly occur in the long tubing during the preheating cycle, and the steam in the annulus mainly consumes the vaporized latent heat to heat the oil layer. Moreover, the steam injection rate is smaller and the dryness is lower, it is more favorable to the heat transfer between the annulus and reservoir.
Key words:  steam assisted gravity drainage (SAGD)  steam cycle preheating  steam injection parameters  dual horizontal well