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research-article

Adaptability Research of Thermal-chemical Assisted Steam Injection in Heavy Oil Reservoirs

[+] Author and Article Information
Zhengbin Wu

State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing, 102249, China
wuzhengbincup@126.com

Huiqing Liu

State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing, 102249, China
liuhqcup@126.com

Xue Wang

State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing, 102249, China
13811461027@163.com

1Corresponding author.

ASME doi:10.1115/1.4038405 History: Received April 23, 2016; Revised October 23, 2017

Abstract

Thermal-chemical flooding (TCF) is an effective alternative to enhance heavy oil recovery after steam injection. In this article, single and parallel sand-pack flooding experiments were carried out to investigate the oil displacement ability of thermal-chemical composed of steam, nitrogen (N2) and viscosity breaker (VB), considering multiple factors such as residual oil saturation (Sorw) post water flood, scheme switch time and permeability contrast. The results of single sand-pack experiments indicated that compared with steam flooding, steam-nitrogen flooding and steam-VB flooding, TCF had the best displacement efficiency, which was 11.7% higher than that of pure steam flooding. The more serious of water-flooded degree, the poorer of thermal-chemical flooding effect. The improvement effect of thermal-chemical flooding almost lost as water saturation reached 80%. Moreover, the earlier thermal-chemical flooding was transferred from steam injection, the higher oil recovery was obtained. The parallel sand-pack experiments suggested that thermal-chemical flooding had good adaptability to reservoir heterogeneity. Emulsions generated after thermal-chemical injection diverted the following compound fluid turning to the low-permeable tube due to its capturing and blocking ability. The expansion of N2 and the disturbance of VB promoted oil recovery in both tubes. As reservoir heterogeneity became more serious, namely permeability contrast was more than 6 in this study, the improvement effect became weaker due to earlier steam channeling in the high-permeable tube.

Copyright (c) 2017 by ASME
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