Characterization and Prediction of Gas Breakthrough With Cyclic Steam and Gas Stimulation Technique in an Offshore Heavy Oil Reservoir

Author:

Wu Haijun12,Du Qingjun3,Hou Jian14,Li Jingsong5,Gong Ruxiang5,Liu Yongge4,Li Zhitao4

Affiliation:

1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China;

2. Shengli Oilfield Sino Shengli Engineering Co., Ltd., Dongying 257060, China e-mail:

3. School of Geosciences, China University of Petroleum, Qingdao 266580, China e-mail:

4. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China e-mail:

5. Research Institute of Oilfield Production, China Oilfield Services, Limited, Tianjin 300450, China e-mail:

Abstract

In this paper, a reservoir simulation study was conducted for the characterization and prediction of gas breakthrough during the development of cyclic steam and gas stimulation (CSGS) for a horizontal well. A new concept named the gas breakthrough coefficient (GBC) was proposed to characterize the gas breakthrough degree quantitatively, and a regression model and two calibration curves were established to predict the gas breakthrough degree. The method of foam plugging to inhibit gas breakthrough was also discussed. It was found that the gas breakthrough degree could be well characterized by the GBC and distinguished as four types: weak, moderate, strong, and severe. The regression model and calibration curves could also be used to predict the gas breakthrough degree under different reservoir and development conditions. Foam plugging was found to be effective to inhibit gas breakthrough when the gas breakthrough degree was moderate or strong.

Publisher

ASME International

Subject

Geochemistry and Petrology,Mechanical Engineering,Energy Engineering and Power Technology,Fuel Technology,Renewable Energy, Sustainability and the Environment

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