Abstract
In this study, emulsion-free radical reaction was applied to synthesize a novel sulfomethylating hydrophobically associating copolymer (HPDS) by using acrylamide, acrylic acid, NaHSO3, HCHO, and a laboratory-made N,N-divinylnonadeca-1,10-dien-2-amine to enhance heavy-oil recovery. The structure and properties of HPDS were characterized by a range of experiments, which showed that HPDS had better stability and enhanced heavy-oil recovery capacity than hydrolyzed polyacrylamide (HPAM). One-dimensional flooding experiments illustrated that HPDS performed better in establishing resistance factor (RF) and residual RF (RRF), and approximately 19.8% oil recovery could be enhanced by injecting 1500 mg/L of HPDS solution compared with that of HPAM at only 14.1%. HPDS has a promising application prospect in enhancing heavy-oil recovery.
Highlights
Heavy-oil reservoirs are one of the most important unconventional resources, with an enormous economic value and an abundant quantity of reserves
Inspired by predecessors’ methods, a novel thermal stable and salt-tolerant polymer referred to as HPDS was synthesized by introducing sulfonic acid groups to a watersoluble hydrophobically associating polymer referred to as HPDN, which was prepared from AM, acrylic acid (AA), and another laboratory-made agent N,N-divinylnonadeca1, 10-dien-2-amine (DNDA) in emulsion-free radical reaction
Sand-pack models were used in the physical simulation experiments to test the capacity of HPDS to establish resistance factor (RF) and residual RF (RRF), which were the measurements of injectability and profile controlling
Summary
Heavy-oil reservoirs are one of the most important unconventional resources, with an enormous economic value and an abundant quantity of reserves. The application of thermal methods to enhance heavy-oil recovery has some crucial challenges due to economic and environmental obstacles [1, 2]. An effective method to improve polymer salt tolerance and thermal stability is by increasing polymer hydrophobic interaction by introducing hydrophobic groups into the molecular chains. Polymers with hydrophobic groups exhibit similar viscosities in fresh and saline waters. If -SO3H groups could be introduced to acrylamide (AM), the polymer could exhibit good thermal stability and increased tolerance with divalent and multivalent metal ions. Inspired by predecessors’ methods, a novel thermal stable and salt-tolerant polymer referred to as HPDS was synthesized by introducing sulfonic acid groups to a watersoluble hydrophobically associating polymer referred to as HPDN, which was prepared from AM, acrylic acid (AA), and another laboratory-made agent N,N-divinylnonadeca1, 10-dien-2-amine (DNDA) in emulsion-free radical reaction. A series of work was conducted to HPDS, such as characterization and performance testing
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
