A novel polymer gel with high-temperature and high-salinity resistance for conformance control in carbonate reservoirs

Wu, Weipeng; Hou, Jirui; Qu, Ming; Yang, Yumeng; Zhang, Wei; Wu, Wenyue; Wen, Yuchen; Liang, Tuo; Xiao, Lixiao

doi:10.1016/j.petsci.2022.05.003

Cited by 11 publications

(3 citation statements)

References 41 publications

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“…In recent years, polyacrylamide copolymerization systems, HPAM/inorganic delayed cross-linking systems, and HPAM/organic delayed cross-linking systems have been applied successively in oilfields [35]. This greatly improved the problem of poor temperature resistance of polyacrylamide gel.…”

Section: Temperature Resistance Of Supramolecular Gelsmentioning

confidence: 99%

Evaluation of Supramolecular Gel Properties and Its Application in Drilling Fluid Plugging

Du,

Feng,

et al. 2023

Processes

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Supramolecular gels are physically cross-linked hydrogels formed by non-covalent interactions. The synthesis, structure optimization, property regulation, and application expansion of supramolecular gels has gradually become the research hotspot in the field of gel materials. According to the non-covalent interactions such as hydrophobic association and hydrogen bonding, the supramolecular gel prepared in this study has excellent rheological properties and adaptive filling and plugging properties, and can be used in the field of drilling fluid plugging. In this paper, the microstructure, rheological properties, temperature resistance, and plugging properties of supramolecular gels were studied and characterized in detail. The experimental findings demonstrated that when the strain was less than 10%, the supramolecular gel displayed an excellent linear viscoelastic region. The increase in strain weakens the rheological properties of supramolecular gel and reduces the elastic modulus of supramolecular gel to a certain extent. The supramolecular gel still had a neat three-dimensional reticular structure after curing at high temperatures, and the network of each layer was closely connected. Its extensibility and tensile properties were good, and it had excellent temperature resistance and mechanical strength. The supramolecular gel had excellent tensile and compressive properties and good deformation recovery properties. When the elongation of the supramolecular gel reached 300%, the tensile stress was 2.33 MPa. When the compression ratio of supramolecular gel was 91.2%, the compressive stress could reach 4.78 MPa. The supramolecular gel could show an excellent plugging effect on complex loss layers with different fracture pore sizes, the plugging success rate could reach more than 90%, and the plugging layer could withstand 6.3 MPa external pressure. The smart plugging fluid prepared with supramolecular gel material could quickly form a fine barrier layer on the rock surface of the reservoir. It could effectively isolate drilling fluid from entering the reservoir and reduce the adverse effects, such as permeability reduction caused by drilling fluid entering the reservoir, so as to achieve the purpose of reservoir protection.

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Section: Temperature Resistance Of Supramolecular Gelsmentioning

confidence: 99%

Evaluation of Supramolecular Gel Properties and Its Application in Drilling Fluid Plugging

Du,

Feng,

et al. 2023

Processes

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“…The in situ cross-linked polymer gel system mainly includes a metal (chromium, − zirconium, , aluminum, etc.) cross-linked polymer gels, aldehyde or phenolic resin cross-linked polymer gels, and polyethylenimine (PEI) cross-linked polymer gels. , Among them, metal cross-linked polymer gels are mainly suitable for oil reservoirs with a formation temperature below 90 °C due to their short gelation time at high temperatures and easy dehydration. , The toxicity of aldehyde and phenolic resin is very high and has been gradually restricted in recent years. Polyethylenimine (PEI), which is used as a food additive, can produce cross-linking with polyacrylamide (PAM) through a nitrogen transfer reaction, thereby forming a high-strength gel, and is a very promising environmentally friendly high-temperature cross-linking agent. , …”

Section: Introductionmentioning

confidence: 99%

Development of Nanomontmorillonite-Reinforced Terpolymer Gels for High-Temperature Petroleum Reservoirs

Zhu,

Zhang,

Gao

et al. 2024

Energy Fuels

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Conventional terpolymer/polyethylenimine (TP/ PEI) gel systems have excellent and controllable gel strength, making them popular gel systems for controlling excessive water production in ultrahigh-temperature reservoirs. To further enhance the strength of the gel, this article used nanomontmorillonite (nano-MMT) as a gel enhancer and investigated its influence mechanism on the gelation performance, rheological parameters, and temperature resistance of TP/PEI gel systems at 80 and 150 °C, respectively. Results show that the gel strength of conventional TP/PEI gels increased with increasing cross-linker PEI concentration at 80 °C. However, excessive cross-linking occurred in the gel system when the PEI concentration increased to 0.5% at 150 °C. Moreover, the addition of nano-MMT shortened the gelation time, and this effect became more significant at higher reaction temperatures. At the same time, the addition of nano-MMT increased the gel strength. When the amount of nano-MMT added was 0.1%, the gel strength and viscosity of the gel system reached their minimum values. It was because nano-MMT had hydroxyl groups that hindered the progress of the cross-linking reaction. When the concentration of nano-MMT was high, it filled in the microgrid and prevented the molecular structure skeleton from being destroyed by high-temperature thermal vibration. Therefore, the nano-MMT-reinforced TP/PEI gel system had high strength and good thermal stability and met the plugging strength requirements under high-temperature reservoir conditions. This study can further supplement the types of nanomaterial-reinforced TP/PEI gel systems and provide theoretical guidance for their further application in water management in high-temperature petroleum reservoirs.

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“…Research has demonstrated that polymer gel systems are promising solutions for addressing the issue of water production issues in oil reservoirs characterized by high temperatures and high concentrations of salt [3][4][5]. A polymer system comprises polymers, cross-linkers, and various auxiliary reagents.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance Evaluation of Temperature-Resistant and Salt-Resistant Gels

Li,

Fu,

2024

Gels

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In order to improve the plugging performance of high-temperature and high-salt oil reservoir plugging agents, this paper utilizes a copolymer composed of acrylamide and 2-acrylamide-2-methylpropanesulfonic acid (AM/AMPS) as the polymer, polyethyleneimine as the cross-linking agent, and nylon fiber as the stabilizer to develop a high-temperature- and high-salt-resistant gel system. This study analyzed and evaluated the temperature resistance, salt resistance and blocking performance of the gel system. The evaluation results show that the gel-forming strength of this gel system can reach an H level, and it has good thermal stability at the high temperature of 130 °C. At the high salinity of 240,720 mg/L, the syneresis rate remains below 2.5%, and the gel-forming time is greater than 15 h; the higher the temperature, the shorter the gelling time. The results of our sand-filled pipe-plugging experiment show that the gel system can adapt to sand-filled pipes with different levels of permeability, and reaching a plugging rate of 94%.

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A novel polymer gel with high-temperature and high-salinity resistance for conformance control in carbonate reservoirs

Cited by 11 publications

References 41 publications

Evaluation of Supramolecular Gel Properties and Its Application in Drilling Fluid Plugging

Evaluation of Supramolecular Gel Properties and Its Application in Drilling Fluid Plugging

Development of Nanomontmorillonite-Reinforced Terpolymer Gels for High-Temperature Petroleum Reservoirs

Preparation and Performance Evaluation of Temperature-Resistant and Salt-Resistant Gels

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