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Energies 2017, 10(7), 1018; https://doi.org/10.3390/en10071018

Matching Relationship and Alternating Injection for Polymer Flooding in Heterogeneous Formations: A Laboratory Case Study of Daqing Oilfield

1
Department of Petroleum Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
2
College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
3
SINOPEC Research Institute of Safety Engineering, Qingdao 266000, China
*
Author to whom correspondence should be addressed.
Received: 13 April 2017 / Revised: 10 July 2017 / Accepted: 11 July 2017 / Published: 18 July 2017
(This article belongs to the Section Energy Sources)
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Abstract

A series of experiments were carried out to study the relationship between polymer and reservoir permeability, as well as the alternating injection pattern for heterogeneous formations. The polymer molecular size (MS) was studied using dynamic light scattering. The parameters such as hydraulic radius, molecular weight (MW), concentrations and salinity were studied. The injection capacity and the relationship between polymer and formation were obtained using injection experiments with natural cores, which represent different regions in the Daqing oilfield. Moreover, an improved injection pattern, alternating injection in heterogeneous formation was studied based on the injection experiments of parallel and in-layer heterogeneous artificial cores. The alternate cycle and slug size were investigated. It was proven that the alternating injection can improve the efficiency of low permeability layers up to 7.3% and a mean value of 4.27%. It was also found that the mechanism of alternating injection is blocking the high permeability layers and improving the water injection profile. We suggest that other fields with high heterogeneity could try the alternating injection to optimize the polymer flooding. Meanwhile, further pilot tests or numerical simulation of polymer alternating injection in heterogeneous formation (formation type II) should be conducted. View Full-Text
Keywords: polymer flooding; molecular size; alternate injection; heterogeneous formation polymer flooding; molecular size; alternate injection; heterogeneous formation
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Liu, S.; Shen, A.; Qiu, F.; Liang, S.; Wang, F. Matching Relationship and Alternating Injection for Polymer Flooding in Heterogeneous Formations: A Laboratory Case Study of Daqing Oilfield. Energies 2017, 10, 1018.

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