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Experimental Evaluation of Oxidizing Breakers for a Polyacrylamide-Based Re-Crosslinkable Preformed Particle Gel
Energy and Fuels
  • Ze Wang
  • Baojun Bai, Missouri University of Science and Technology
  • Enze Zhou
  • Jingyang Pu
  • Thomas P. Schuman, Missouri University of Science and Technology
Abstract

Re-crosslinkable preformed particle gel (RPPG) is a newly developed conformance control agent that can reassemble as an integrity after swelling in water. However, the RPPG has the potential to plug the injection facilities or wellbore if a treatment is not properly designed. This study focuses on selecting and evaluating the oxidizing breakers that can effectively degrade the RPPG. Bottle tests were conducted by immersing the re-crosslinked RPPG in the breaker solutions. The RPPG weight change was measured with time to analyze the breaking process. Four types of oxidizing breakers, NaClO, Ca(ClO)2, heat-activated Na2S2O8, and NaOH-activated Na2S2O8 were examined. The effect of factors, including breaker concentration, temperature, RPPG concentration on the gel breaking rate and completeness, was investigated. According to the results, three of the breakers were proven effective, excluding the Ca(ClO)2, which impaired the breaking process by generating a compact cover on the surface of RPPG. The NaOH-activated Na2S2O8 was the most effective breaker benefitting from its wide practical temperature range and effectiveness at the conditions of low breaker concentration or high RPPG concentration. More generally, the RPPG breaking was faster and more complete with a higher breaker concentration or a higher temperature. However, the increment of the RPPG concentration significantly increased the breaking time and the percentage of residue weight to the RPPG original weight.

Department(s)
Geosciences and Geological and Petroleum Engineering
Second Department
Chemistry
Keywords and Phrases
  • Calcium compounds,
  • Sodium hydroxide, Breaking process,
  • Conformance control,
  • Cross-linkable,
  • Crosslinked,
  • Effect of factors,
  • Experimental evaluation,
  • Temperature range,
  • Weight change, Bottles
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2019 American Chemical Society (ACS), All rights reserved.
Publication Date
6-1-2019
Citation Information
Ze Wang, Baojun Bai, Enze Zhou, Jingyang Pu, et al.. "Experimental Evaluation of Oxidizing Breakers for a Polyacrylamide-Based Re-Crosslinkable Preformed Particle Gel" Energy and Fuels Vol. 33 Iss. 6 (2019) p. 5001 - 5010 ISSN: 0887-0624; 1520-5029
Available at: http://works.bepress.com/thomas-schuman/77/