Open AccessStudy on Optimization Application of Iron Ion Stabilizer in the Polymer Injection Process of Offshore Oilfield
Author(s) -
Shengli Zhu,
Shijie Zhu,
Hong Zhang,
Changlong Liu,
Leiting Shi,
Zhongbin Ye
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/729/1/012021
Subject(s) - stabilizer (aeronautics) , diluent , polymer , chemical engineering , viscosity , flocculation , aqueous solution , materials science , chemistry , polymer chemistry , organic chemistry , composite material , mechanical engineering , engineering
A large amount of Fe 2+ /Fe 3+ ions are produced by corrosion and fouling in the high-pressure polymer injection process of offshore platforms, which will affect the viscosity of the polymer solution, and is difficult to effectively control by the addition of stabilizers in the curing tank. In order to solve this problem, this paper has carried out related research and the results show that: 1) Fe 2+ mainly generates free radicals (·OH) by oxidation catalysis, to destroy long chains of polymer molecules, causing irreversible fragment breakage, resulting in a significant decrease in polymer viscosity; 2) Fe 3+ mainly binds to hydroxyl groups, resulting in flocculation and viscosity reduction of polymers; 3) Stabilizers with complexation can effectively control Fe 3+ to form water-soluble complexes, while excess stabilizers increase salt content and reduce polymer viscosity by electrostatic shielding effect. In order to effectively control the influence of Fe 2+ /Fe 3+ and the stabilizer on the polymer solution in the production process, an appropriate amount of complex stabilizer should be added to the diluent inlet of the mixture of the polymer mother liquor and the diluent.