An Experimental Study on the Distribution of Residual Oil by Water Flooding in Parallel Horizontal Well Pattern

doi:10.11885/j.issn.1674-5086.2020.08.02.01

Abstract

Abstract: The narrow development environment and high development cost of offshore oil fields have promoted the wide application of horizontal well development methods in water injection development in offshore oil fields. In view of the fact that most of the reservoirs in China's offshore oilfields are delta clastic deposits with strong reservoir heterogeneity, the current parallel horizontal well pattern water injection development is not good in effectiveness, and a large amount of remaining oil remains underground. The effects of displacement velocity and reservoir heterogeneity on the distribution of remaining oil from water flooding in parallel horizontal well pattern are studied by means of water flooding physical simulation experiment. The experimental results show that the degree of recovery in homogeneous reservoirs is higher than that in heterogeneous reservoirs, and the remaining oil is distributed near the toe of the production well. The change of displacement velocity will not affect the distribution of remaining oil in homogeneous reservoir. In the plane heterogeneous reservoirs with different permeability contrast, the higher the stage difference is, the later the water breakthrough occurs in the heterogeneous reservoir with lower permeability in the high permeability zone, and the ultimate recovery degree and average oil displacement efficiency are slightly higher than those with small permeability contrast and high permeability zone. The remaining oil is mainly located in the area near the heel-central part of the production well in the middle and low permeability zones. The remaining oil in the reservoirs with small grade difference and high permeability value in the high permeability zone is distributed in the area near the heel of the production well in the low permeability zone. The experimental study has concluded that parallel well pattern conditions are more suitable for lower displacement speeds and parallel horizontal well patterns are more suitable for heterogeneous reservoirs with larger grade differences and smaller maximum reservoir permeability, which provides theoretical and technical support for the design of horizontal well pattern in oilfield.

Key words: remaining oil distribution, parallel horizontal well pattern, displacement experiment, displacement law, influence factor

CLC Number:

TE341

LUO Xianbo, TANG Hong, ZHANG Zhang, YANG Junjie, ZHANG Jun. An Experimental Study on the Distribution of Residual Oil by Water Flooding in Parallel Horizontal Well Pattern[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(1): 100-112.

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