Title: Feasibility study of in-situ generating carbon dioxide huff-n-puff process for EOR

Authors: Fulin Yang; Xiaoling Yu; Hongmei Lv; Yuanchun Tang

Addresses: Petroleum Engineering Technology Research Institute of Jiangsu Oilfield Company, SINOPEC, Wei Yang Rode 188, Yangzhou, Jiangsu 225009, China ' Petroleum Engineering Technology Research Institute of Jiangsu Oilfield Company, SINOPEC, Wei Yang Rode 188, Yangzhou, Jiangsu 225009, China ' Petroleum Engineering Technology Research Institute of Jiangsu Oilfield Company, SINOPEC, Wei Yang Rode 188, Yangzhou, Jiangsu 225009, China ' Petroleum Engineering Technology Research Institute of Jiangsu Oilfield Company, SINOPEC, Wei Yang Rode 188, Yangzhou, Jiangsu 225009, China

Abstract: In-situ gas generation huff-n-puff technology involves injection of reagents into formations that react with each other to generate gas. In the lab, we developed a new in-situ gas generation formula, NS-1, which consists of urea, catalyst and HCL. We evaluated this formula through a high pressure high temperature (HPHT) reactor and corefloods. The lab results indicate that the insitu generating gas huff-n-puff followed by waterflooding is more efficient than waterflooding followed by the in-situ generating gas huff-n-puff. The in-situ generation gas huff-n-puff is more effective in low-permeability reservoirs.

Keywords: enhanced oil recovery; EOR; in-situ generation; gas generation; huff-n-puff; waterflooding; low-permeability reservoirs; oil reservoirs.

DOI: 10.1504/IJPE.2014.064793

International Journal of Petroleum Engineering, 2014 Vol.1 No.2, pp.177 - 191

Received: 05 Sep 2013
Accepted: 25 Jun 2014
Published online: 30 Sep 2014 *

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