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Research Papers: Oil/Gas Reservoirs

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

[+] Author and Article Information
Haijun Wu

State Key Laboratory of Heavy Oil Processing,
China University of Petroleum,
Qingdao 266580, China;
Shengli Oilfield Sino Shengli
Engineering Co., Ltd.,
Dongying 257060, China
e-mail: 1988.whj@163.com

Qingjun Du

School of Geosciences,
China University of Petroleum,
Qingdao 266580, China
e-mail: duqingjun@upc.edu.cn

Jian Hou

State Key Laboratory of Heavy Oil Processing,
China University of Petroleum,
Qingdao 266580, China;
School of Petroleum Engineering,
China University of Petroleum,
Qingdao 266580, China
e-mail: houjian@upc.edu.cn

Jingsong Li

Research Institute of Oilfield Production,
China Oilfield Services, Limited,
Tianjin 300450, China
e-mail: lijs5@cosl.com.cn

Ruxiang Gong

Research Institute of Oilfield Production,
China Oilfield Services, Limited,
Tianjin 300450, China
e-mail: gongrx@cosl.com.cn

Yongge Liu

School of Petroleum Engineering,
China University of Petroleum,
Qingdao 266580, China
e-mail: yg.leo@foxmail.com

Zhitao Li

School of Petroleum Engineering,
China University of Petroleum,
Qingdao 266580, China
e-mail: air_lzt@163.com

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Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 6, 2014; final manuscript received September 26, 2016; published online October 13, 2016. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 139(3), 032801 (Oct 13, 2016) (10 pages) Paper No: JERT-14-1177; doi: 10.1115/1.4034857 History: Received June 06, 2014; Revised September 26, 2016

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.

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Figures

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Fig. 1

Water cut matching result of reservoir

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Fig. 2

Pressure matching result of reservoir

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Fig. 3

Distribution of five horizontal wells and permeability at layer 6. The permeability range of the whole field is between 600 × 10−3 μm2 and 6800 × 10−3 μm2. There is a high-permeability channels between the Pro3 and Inj wells, and its permeability is eight times the initial permeability.

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Fig. 4

Distribution of gas saturation around central well at different injection times. The range of gas saturation increases with time (a) t = 4 days, (b) t = 8 days, (c) t = 12 days, (d) t = 16 days, and (e) t = 20 days.

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Fig. 5

Daily gas rate and cumulative gas production of Pro3 well

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Fig. 6

Influence of permeability on daily gas rate of Pro3 well

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Fig. 7

Influence of different parameters on gas breakthrough coefficient (a) influence of permeability on GBC, (b) influence of reservoir thickness on GBC, (c) influence of permeability times on GBC, (d) influence of injection strength on GBC, and (e) influence of pressure difference on GBC

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Fig. 8

GBC calibration curves of injection strength and injection production pressure difference

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Fig. 9

GBC calibration curves of injection strength and injection production pressure difference

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Fig. 10

Gas breakthrough coefficient of eight wells in China Bohai Oilfield

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Fig. 11

Gas saturation distribution of different gas breakthrough degrees after injecting foam. The image from (a) to (h) represent the gas saturation of (a) weak (without foam), (b) weak (foam), (c) moderate (without foam), (d) moderate (foam), (e) strong (without foam), (f) strong (foam), (g) severe (without foam), and (h) severe (foam), respectively.

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