Solvent-Assisted SAGD Startup Technology Adaptability in Super-Heavy Oil Reservoir

doi:10.3969/j.issn.1006-6535.2020.04.010

Abstract

Abstract: In order to improve the low viscosity reduction rate of steam preheating, long preheating cycle, large steam consumption, uneven interwell producing degree and other problems in the dual horizontal-well SAGD with conventional steam cycle preheating, laboratory test and numerical simulation were combined to understanding the technical principle and adaptability of solvent-assisted SAGD preheating startup technology. Research indicates that the solvent-assisted SAGD is featured by small preheating cycle, low steam consumption and uniform interwell connectivity, which is applicable for the super-heavy oil reservoirs with permeability between lateral sections not less than 500 mD, oil saturation not less than 60% and the crude oil viscosity from 2.0×10⁴ mPa·s to 10.0×10⁴ mPa·s at 50 ℃. The reservoir screening principles could provide certain reference for other heavy oil reservoirs to implement solvent-assisted SAGD startup technology.

Key words: solvent-assisted, SAGD, startup stage, interwell connectivity, heavy oil reservois

CLC Number:

TE345

Yang Zhaochen, Yu Bing, Wu Yongbin, Wang Li, Zhang Jiahao, Tong Juan, Jiang Dan, Zhang Chonggang. Solvent-Assisted SAGD Startup Technology Adaptability in Super-Heavy Oil Reservoir[J]. Special Oil & Gas Reservoirs, 2020, 27(4): 67-72.

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