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Research Papers: Petroleum Engineering

A Study on a Copolymer Gelant With High Temperature Resistance for Conformance Control

[+] Author and Article Information
Lei Zhang

Department of Petroleum Engineering,
China University of Geosciences (Wuhan),
No. 388, Lumo Road,
Wuhan 430074, China
e-mail: zhangshishishi.188@163.com

Cheng Jing

Institute of Petroleum Engineering,
Xi'an Petroleum University,
No. 18, East of the Second Dianzi Road,
Xi'an 710065, China
e-mail: 342011042@qq.com

Jing Liu

Institute of Petroleum Engineering,
China University of Petroleum (East China),
No. 66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: liujing4522009@163.com

Khan Nasir

Institute of Petroleum Engineering,
China University of Petroleum (East China),
No. 66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: n.kh55@yahoo.com

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received February 6, 2016; final manuscript received September 28, 2017; published online October 24, 2017. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 140(3), 032907 (Oct 24, 2017) (7 pages) Paper No: JERT-16-1078; doi: 10.1115/1.4038196 History: Received February 06, 2016; Revised September 28, 2017

Due to the limited temperature resistance, the deep conformance control technology of using the conventional hydrolyzed polyacrylamide (HPAM) gel failed to enhance oil recovery in high-temperature heterogeneous oil reservoirs. Therefore, it is necessary to develop a gelant with high temperature resistance to meet the demands of increasing oil production and decreasing water cut in high-temperature heterogeneous oil reservoirs. In this paper, a copolymer is first synthesized by the method of inverse emulsion polymerization using 2-acrylamide-2-tetradecyl ethyl sulfonic acid (AMC16S), acrylamide (AM), and acrylic acid (AA). The developed copolymer has a highly branching skeleton and can resist temperature up to 100 °C. And then, a gelant with high temperature resistance and good shear resistance can be formed by mixing a certain proportion of the developed copolymer and polyethyleneimine (PEI). After the controllable gelation, a copolymer gel is formed and the formed gel can maintain the stable performance for a long time in the high-temperature environment. Experimental results show that the developed gelant can be applied in the conformance control of high-temperature heterogeneous oil reservoir.

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Figures

Grahic Jump Location
Fig. 1

FTIR spectrum of the copolymer

Grahic Jump Location
Fig. 2

Relationship curve of the viscosity and the concentration of polymer solution

Grahic Jump Location
Fig. 3

SEM images of 3000 mg/L copolymer solution

Grahic Jump Location
Fig. 4

SEM images of 3000 mg/L HPAM solution

Grahic Jump Location
Fig. 5

The viscosity change of 3000 mg/L copolymer solution with the testing time under different temperatures

Grahic Jump Location
Fig. 6

The viscoelasticity value of 3000 mg/L copolymer solution after 180 days in the incubator at 1 Hz under different temperatures (G′: elastic modulus; G″: viscous modulus)

Grahic Jump Location
Fig. 7

Gelation behavior of copolymer and PEI

Grahic Jump Location
Fig. 8

Gelation behavior of copolymer and PRP

Grahic Jump Location
Fig. 9

SEM images of the gel (the gelant is consisting of 3000 mg/L copolymer and 2000 mg/L PEI)

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