Polymer Gel Systems for Water Management in High-Temperature Petroleum Reservoirs: A Chemical Review

Abstract

Polymer gel systems as water management materials have been widely used in recent years for enhanced oil recovery applications. However, most polymer gel systems are limited in their ability to withstand the harsh environments of high temperature and high salinity. Those polymer gel systems that can handle high-temperature excessive water treatments are reviewed in this paper and categorized into three major types: in situ cross-linked polymer gels, preformed gels, and foamed gels. Future directions for the development of polymer gel systems for high-temperature conditions are recommended. For excessive water management with temperatures from 80 to 120 °C, current polymer systems are substantially adequate. Polymer gel systems composed of partially hydrolyzed polyacrylamide (HPAM)/chromium can be combined with nanoparticle technology to elongate their gelation time and reduce the adsorption of chromium ions in the formation. Phenolic resin cross-linker systems have reasonable gelation times and gel strengths; however, more environmentally friendly cross-linkers should be developed to meet the increasingly stringent environmental requirements. For particle gels, the addition of functional monomer(s) can improve the antitemperature performance. When the applied temperatures reach 120 °C, inorganic cross-linker systems are no longer applicable, and the gelation time of organic cross-linking polymer gel systems and gel thermal stability will decrease significantly due to fast cross-linking reactions. During this period, retarders can be used to elongate the gelation time, and gel strength enhancers (e.g., cement, silica) can also be applied to improve the gel strength at such extremely high temperatures. Most importantly, novel polymers (e.g., ter- or tetrapolymers), functional monomers, and environmentally friendly cross-linkers need to be discovered and developed for polymer gel applications. Second cross-linking systems can be applied to further enhance the strength of the particle gels in harsh conditions. On the basis of these developments, foamed gels can be well-implemented in fractures and wormholes to save the amount of injected gels.

Regulating Gelation Time and Kinetics Analysis Based on the ARGET ATRP Mechanism

“…The in situ crosslinked polymer system, injected as a solution and then crosslinked at reservoir settings into a three‐dimensional network structure, has been successfully applied as an enhanced oil recovery technology, where it is utilized as flow diverting or blocking agents due to its cost‐effective high performance and simple preparation process . These in situ crosslinked polymer gels mainly include the natural polymer‐based gels and the synthetic polymer‐based gels . Natural polymers include guar, lignin, tannin, and so forth.…”

“…[6][7][8][9] These in situ crosslinked polymer gels mainly include the natural polymerbased gels and the synthetic polymer-based gels. [10][11][12] Natural polymers include guar, lignin, tannin, and so forth. Synthetic polymers include polyacrylamides or partially hydrolyzed polyacrylamide, polyacrylonitrile, poly(vinyl alcohol), and copolymers based on acrylamide (AM) monomers.…”

In situ organically cross‐linked polymer gel for high‐temperature reservoir conformance control: A review

“…The gel that is thermally stable is able to maintain a reasonable physical structure for required period of time. Since 2000s, numerous review papers have extensively discussed on the development of several organic polymer gels for conformance control . However, we believe that a thorough review on the organically cross‐linked polymer for high‐temperature reservoirs, especially on the aspect of gelation kinetics and the factors that affect gelation behaviors, has not been brought up for further discussion.…”

A novel temperature‐tolerant foamed resin for enhanced oil recovery

“…[15][16][17][18][19][20] In this paper, a two-step synthesis method of the crosslinked polymer gel is employed: (1) synthesis of furfuryl alcohol resin prepolymer and (2) preparation of the furfuryl alcohol plugging agent. [15][16][17][18][19][20] In this paper, a two-step synthesis method of the crosslinked polymer gel is employed: (1) synthesis of furfuryl alcohol resin prepolymer and (2) preparation of the furfuryl alcohol plugging agent.…”