Investigation on How Binary System Matches with Reservoir Permeability: A Case Study of the Conglomerate Reservoir in Lower Karamay Formation in District Qizhong, Karamay Oilfield

doi:10.7657/XJPG20200508

Abstract

Abstract:

The reservoir permeability obtained from mud log in District Qizhong of Karamay oilfield is mainly distributed between 28.8 and 300 mD. The permeability contrast is large and channeling is serious in partial zones. Pilot tests on binary flooding found some wells blocked and the production capability reduced greatly, so it was urgent to understand how the binary flooding system can well match with the reservoir properties. Binary flooding experiments were performed on cores with different permeabilities, and the results were evaluated in resistance coefficient, residual resistance coefficient and viscosity loss rate. It is concluded that the binary systems with low or medium to high molecular weight (10 - 50 mPa·s and 10 - 20 mPa·s, respectively) are applicable for the reservoirs with the permeability not more than 30.0 mD, and those with low to medium (10 - 50 mPa·s) and high molecular weight (10 - 35 mPa·s) are applicable for the reservoir with the permeability of 30.0 to 100.0 mD, and those with low to high molecular weight (10 - 50 mPa·s) for the reservoir with the permeability of 100.0 to 300.0 mD.

Key words: Karamay oilfield, conglomerate oil reservoir, binary system, polymer, surfactant, molecular weight, permeability, resistance coefficient, residual resistance coefficient, injectivity evaluation

CLC Number:

TE357.46

NIE Xiaobin, LI Zhihong, LUAN Huoxin, WEI Kai, ZHANG Liwei, WANG Jian. Investigation on How Binary System Matches with Reservoir Permeability: A Case Study of the Conglomerate Reservoir in Lower Karamay Formation in District Qizhong, Karamay Oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(5): 565-570.

Figures/Tables 7

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