Preparation and rheological Evaluation of a thixotropic polymer gel for water shutoff in fractured tight reservoirs

Ge, Jijiang; Wu, Qianhui; Ding, Lianhui; Guo, Hongbin; Zhao, Ansha

doi:10.1016/j.petrol.2021.109542

Cited by 22 publications

(9 citation statements)

References 32 publications

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“…After the swelling at high temperature and high salinity for 90 d, the d 50 of the AMPS/AM and AMPS/AM@SiO 2 microgel particles was 168.32 and 132.38 μm, respectively, and the expansion ratios were 10.8 and 9.4, respectively. At 130 °C and the salinity of 200,000 mg/L, the AMPS/AM and AMPS/AM@SiO 2 microgel particles could maintain their swelling stability with aging time, indicating that they have remarkable temperature and salinity resistance and can be used at a high temperature (130 °C) and high salinity conditions (200,000 mg/L) …”

Section: Resultsmentioning

confidence: 99%

“…At 130 °C and the salinity of 200,000 mg/L, the AMPS/AM and AMPS/AM@ SiO 2 microgel particles could maintain their swelling stability with aging time, indicating that they have remarkable temperature and salinity resistance and can be used at a high temperature (130 °C) and high salinity conditions (200,000 mg/L). 40 Figure 8 shows the change in the morphology of the microgel particles with aging times at a salinity of 200,000 mg/ L and 130 °C. After aging for 20 d, the AMPS/AM microgel particles solution was dark yellow and could be dispersed in water without precipitation and agglomeration.…”

Section: Microgel Particlesmentioning

confidence: 99%

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Temperature- and Salt-Tolerant 2-Acrylamide-2-methylpropanesulfonic Acid/AM@SiO₂ Microgel Particles: Synthesis and Enhanced Oil Recovery Performance Evaluation

Wang,

Song

et al. 2023

Ind. Eng. Chem. Res.

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To simultaneously meet the demands of small size for easy transportation and injection as well as temperature and salinity resistance, 2-acrylamide-2-methylpropanesulfonic acid (AMPS)/AM@SiO2 microgel particles were synthesized to achieve a good performance for the in-depth profile control treatment. The characteristic functional group, mechanical property, and enhanced oil recovery (EOR) performance were comprehensively evaluated by Fourier infrared spectrometer, nanoindentation apparatus, and sand-packed tubes with different permeability conditions. AMPS contains active double bonds and sulfonic acid groups, which could enhance the temperature and salinity resistance of gel systems. Therefore, the AMPS/AM and AMPS/AM@SiO2 microgel particles have remarkable temperature and salinity tolerance and can be used at a high temperature (130 °C) and high salinity conditions (200,000 mg/L). The mechanical energy can be dissipated effectively by adding 1.0 wt % nano-SiO2 which could significantly improve the compression strength and elastic modulus. The elastic moduli of the AMPS/AM@SiO2 microgel particles (1500 mg/L) are 17.36 MPa, which is much higher than that of AMPS/AM microgel particles (10.44 MPa). This effect can improve the performance of the antierosion and compression deformation of the AMPS/AM@SiO2 microgel particles. The AMPS/AM@SiO2 microgel particles not only have good plugging performance and antierosion stability that can divert the subsequent injected fluid to lower permeable zones but also can achieve an in-depth secondary plugging effect through compression deformation and remigration. The performance of profile control and oil displacement of the AMPS/AM@SiO2 microgel particles has been verified from parallel sand-packed tubes simulating strong heterogeneous reservoirs. Compared with water flooding, the total oil recovery was increased by 22.8% after the injection of 0.5 PV AMPS/AM@SiO2 microgel particles, which is higher than that of AMPS/AM microgel particles (16.4%). This work not only provides a potential agent, i.e., AMPS/AM@SiO2 microgel particle, for in-depth profile control in high temperature and high salinity offshore oilfields but also helps for a better understanding of the mechanism of in-depth profile control and EOR for microgel particles.

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Section: Resultsmentioning

confidence: 99%

Section: Microgel Particlesmentioning

confidence: 99%

Temperature- and Salt-Tolerant 2-Acrylamide-2-methylpropanesulfonic Acid/AM@SiO₂ Microgel Particles: Synthesis and Enhanced Oil Recovery Performance Evaluation

Wang,

Song

et al. 2023

Ind. Eng. Chem. Res.

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“…To address these issues, we designed and prepared a hydrophobic monomer and synthesized a temperature- and salt-resistant weak gel system exhibiting a spatial network structure using phenolic resin as the crosslinking agent [ 16 , 17 ]. We analyzed the gel formation ability, temperature and salt resistance, injection performance, liquid flow effect, plugging performance, micropore throat migration, and plugging characteristics of the thermal- and salt-resistant gel consisting of the hydrophobic monomer [ 18 , 19 , 20 , 21 , 22 ]. The results reported herein provide a platform to achieve profile control in weak gels under conditions of high temperatures and salinity.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System

et al. 2023

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We targeted high-temperature and highly saline old oil fields, whose environmental conditions could be attributed to the significantly high heterogeneity cause by long-term water flooding. The Huabei Oilfield was chosen as the research object. We developed a hydrophobic functional monomer–polymer with temperature and salt resistance by introducing the temperature-resistant and salt-resistant monomer NVP and a hydrophobic functional monomer into the main chain for copolymerization. We used a crosslinking agent with phenolic resin to prepare a weak gel system that showed temperature and salt resistance and investigated its temperature and salt resistance, infective property, plugging performance, liquid flow ability, micropore throat migration, and plugging characteristics. The results obtained using the infrared spectroscopy technique revealed the successful preparation of the phenolic resin crosslinker. The weak gel exhibited good temperature and salt resistance when the polymer concentration was 2000 mg/L, the cohesion ratio was 1:1.5, the additive concentration was 2000 mg/L, the reservoir temperature was 120 °C, and the injected water salinity was 40,300.86 mg/L. The average viscosity retention rate of the 90-day weak gel reached more than 80% and its microstructure was examined. The coreflow experiment results revealed that the weak gel system was characterized by good infectivity. After plugging the weak gel, the effect on the direction of the liquid flow was evident and the flow rate of the low permeability layer increased to a maximum of 48.63% under conditions of varying permeability levels. A significant improvement in the water absorption profile was achieved. The plugging was carried out through a sand-filling pipe under varying permeability conditions and the pressure measuring points in the sand-filling pipe were sucessfully pressurized. The migration ability of the weak gel was good and the blocking rate was >85%.

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“…Thixotropic gel is favored by experts and scholars at home and abroad because of its excellent shear properties. In order to plug the fracture with high conductivity and improve the sweep efficiency of remaining oil, Ge et al used sodium montmorillonite particles prepared in a thixotropic gel system [34]. The thixotropic gel had good rheological properties and was beneficial to the injection and filling of the gel.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Physicochemical Properties of a Shear Thixotropic Polymer Gel for Lost Circulation Control

Yang

Bai

Sun

et al. 2022

Gels

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Polymer gel lost circulation control technology is a common and effective technique to control fractured lost circulation. The performance of a lost circulation control agent is the key to the success of lost circulation control techniques. In this study, rheological tests were used to study the physical and chemical properties of a shear thixotropic polymer gel system, such as anti-dilution, high temperature resistance and high salt resistance. The results showed that the shear thixotropic polymer gel system had the ability of anti-dilution, and the gel could be formed under a mixture of 3 times volume of heavy salt water and 3/7 volume white oil, and could keep the structure and morphology stable. Secondly, the gel formation time of shear thixotropic polymer gel system could be controlled and had good injection performance under the condition of 140 °C and different initiator concentrations. Meanwhile, the shear thixotropic polymer gel system had the ability of high temperature and high salt resistance, and the gel formation effect was good in salt water. When the scanning frequency was 4 Hz and the temperature was 140 °C, the storage modulus (G′) of the gel was 4700 Pa. The gel was dominated by elasticity and had excellent mechanical properties. By scanning electron microscope observation, it was found that the shear thixotropic polymer gel system had a stable three-dimensional reticular space skeleton under the condition of high salt, indicating that it had excellent ability to tolerate high salt. Therefore, the shear thixotropic polymer gel had high temperature and high salt resistance, dilution resistance and good shear responsiveness. It is believed that the results presented in this work are of importance for extending real-life applications of shear thixotropic polymer gel systems.

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Preparation and rheological Evaluation of a thixotropic polymer gel for water shutoff in fractured tight reservoirs

Cited by 22 publications

References 32 publications

Temperature- and Salt-Tolerant 2-Acrylamide-2-methylpropanesulfonic Acid/AM@SiO₂ Microgel Particles: Synthesis and Enhanced Oil Recovery Performance Evaluation

Temperature- and Salt-Tolerant 2-Acrylamide-2-methylpropanesulfonic Acid/AM@SiO₂ Microgel Particles: Synthesis and Enhanced Oil Recovery Performance Evaluation

Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System

Experimental Study on Physicochemical Properties of a Shear Thixotropic Polymer Gel for Lost Circulation Control

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Preparation and rheological Evaluation of a thixotropic polymer gel for water shutoff in fractured tight reservoirs

Cited by 22 publications

References 32 publications

Temperature- and Salt-Tolerant 2-Acrylamide-2-methylpropanesulfonic Acid/AM@SiO2 Microgel Particles: Synthesis and Enhanced Oil Recovery Performance Evaluation

Temperature- and Salt-Tolerant 2-Acrylamide-2-methylpropanesulfonic Acid/AM@SiO2 Microgel Particles: Synthesis and Enhanced Oil Recovery Performance Evaluation

Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System

Experimental Study on Physicochemical Properties of a Shear Thixotropic Polymer Gel for Lost Circulation Control

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Product

Resources

About

Temperature- and Salt-Tolerant 2-Acrylamide-2-methylpropanesulfonic Acid/AM@SiO₂ Microgel Particles: Synthesis and Enhanced Oil Recovery Performance Evaluation

Temperature- and Salt-Tolerant 2-Acrylamide-2-methylpropanesulfonic Acid/AM@SiO₂ Microgel Particles: Synthesis and Enhanced Oil Recovery Performance Evaluation