New WAG Injection Model Based on the Produced Gas Density#br#
Variation for Enriched-gas Flooding

doi:10.11885/j.issn.1674-5086.2013.12.30.01

Abstract

Abstract:

When using the WAG models proposed in the literatures，different slug conclusions are obtained by using common
indexes such as oil recovery，TRF，cumulative net cash flow and NPV. The reason is that the WAG design method has
neglected the quantitative relationship between the injected enriched-gas volume and the amount of remaining oil in the swept
region. In this paper，an efficient optimization and design method is proposed and developed for water-alternating-gas injection
model（EWAG）injection process. The proposed technique is able to quantitatively determine the sizes of the enriched-gas slug
and water slug for each cycle of the water-alternating-gas（WAG），as well as the total number of injection cycles. Applying this
method provides this opportunity to implement the WAG scenario more efficiently and economically. The numerical simulation
showed that in comparison with other conventional WAG scenarios with traditional optimization approaches，the EWAG has
the obvious advantages of evaluation indices，such as the oil recovery factor and cumulative net cash flow.

Key words: enriched-gas flooding, condensate, produced gas density, displacement efficiency, EWAG

CLC Number:

TE357.7

WANG Shengkui1，2*, ZHANG Weidong3, YUAN Xiangchun1, WEI Xuguang3, CAI Maojia4. New WAG Injection Model Based on the Produced Gas Density#br# Variation for Enriched-gas Flooding[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.12.30.01.

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New WAG Injection Model Based on the Produced Gas Density#br# Variation for Enriched-gas Flooding

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