Study on the influence of emulsification property of functional polymers on enhanced oil recovery and its mechanism

Kang, Wanli; Sarsenbekuly, Bauyrzhan; Turtabayev, Sarsenbek; Yang, Hongbin; Zhu, Tongyu; Aidarova, Saule; Габдуллин, М. Т.; Ospanova, Zhanar; Issakhov, Miras

doi:10.1016/j.petrol.2019.106627

Cited by 26 publications

(10 citation statements)

References 21 publications

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“…The schematic diagram of core flooding equipment is illustrated in Figure 1. 51 A three-layer artificial vertical heterogeneous core with high permeability (200/ 500/1500 mD) was prepared for displacement experiments. After dehydration, the density of Bohai oil was 0.79 g/cm 3 , and the viscosity at 95 °C was 20.15 mPa•s −1 .…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, the surface activation of PHAD copolymers improved the stability of emulsified oil, which was conducive to the stripping of oil films from the rock surface and improved the flushing efficiency in the oil displacement process. 51 Because of the combination of these two effects, the recovery of PHAD copolymers was much higher than that of PAM.…”

Section: Methodsmentioning

confidence: 99%

“…The core flooding experiments were carried out following the process elsewhere. The schematic diagram of core flooding equipment is illustrated in Figure . A three-layer artificial vertical heterogeneous core with high permeability (200/500/1500 mD) was prepared for displacement experiments.…”

Section: Methodsmentioning

confidence: 99%

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A Hydroxypropyl Methyl Cellulose-Based Graft Copolymer with Excellent Thermothickening and Anti-salt Ability for Enhanced Oil Recovery

et al. 2022

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Thermothickening polymers are a novel type of material developed for enhanced oil recovery applications in high-temperature and high-salinity oil reservoirs. However, the existing synthesis process of thermoviscosifying polymers is complex and of high cost, both of which limit the wide application of thermoviscosifying polymers. In this study, a thermothickening water-soluble polymer (PHAD) with a low concentration was synthesized by a “graft from” method, with acrylamide and diacetone acrylamide as grafted monomers and hydroxypropyl methyl cellulose as the backbone chain. The basic parameters for PHAD copolymers were systematically studied in comparison with their homopolyacrylamide counterpart. The results show that the PHAD copolymers exhibited excellent thermothickening ability even when the polymer concentration was 0.2 wt % (total salinity is 9350.08 mg·L–1) upon increasing the temperature from 25 to 90 °C, where the apparent viscosity enhancement changes from 4.0 to 13.3 times with increasing the diacetone acrylamide content in PHAD copolymers. The PHAD copolymers also showed good salt tolerance, thermal stability, and viscoelastic properties under harsh reservoir conditions, which are attributed to the synergistic effect of the rigid heterocyclic ring structure and hydrophobic intermolecular association of thermoresponsive monomers within polymer chains. Moreover, the core displacement experiment and etched glass microscopic model show that the PHAD copolymers have good migration in porous media. Due to its high sweep efficiency, the PHAD copolymer has a higher recovery factor (14.0%) than polyacrylamide (4.3%), which makes it more suitable for salt-tolerant and temperature-tolerant tertiary oil recovery chemicals.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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A Hydroxypropyl Methyl Cellulose-Based Graft Copolymer with Excellent Thermothickening and Anti-salt Ability for Enhanced Oil Recovery

et al. 2022

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“…Most Chinese oil companies, including those in Daqing, Shengli, and Dagang, can produce their own polymers. In addition to HPAM, a variety of new polymers, including comb-type [ 112 ], star-type [ 113 ], associative [ 114 , 115 , 116 , 117 , 118 ], biological [ 119 ], amphiphilic [ 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 ], thermoviscosifying [ 128 , 129 ], permeability self-adaptive [ 130 , 131 ], and salt-resistance polymers (SPRs) [ 132 , 133 , 134 , 135 , 136 ], are synthesized and used in field tests and applications. Some polymers have good salinity tolerance under the standard conditions used in Chinese reservoirs.…”

Section: Polymer Development and Productionmentioning

confidence: 99%

“…In addition, the RFF of APPs is lower than that of CDG and a bit larger than that of HPAM [ 147 ]. The molecular structure of APPs is given in [ 120 ]. Some researchers have claimed that APPs have a similar structure to HPAM [ 127 , 148 ].…”

Section: Polymer Development and Productionmentioning

confidence: 99%

Recent Advances in Polymer Flooding in China

et al. 2022

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Polymer flooding is drawing lots of attention because of the technical maturity in some reservoirs. The first commercial polymer flooding in China was performed in the Daqing oilfield and is one of the largest applications in the world. Some laboratory tests from Daqing researchers in China showed that the viscoelasticity of high molecular weight polymers plays a significant role in increasing displacement efficiency. Hence, encouraged by the conventional field applications and new findings on the viscoelasticity effect of polymers on residual oil saturation (ROS), some high-concentration high-molecular-weight (HCHMW) polymer-flooding field tests have been conducted. Although some field tests were well-documented, subsequent progress was seldom reported. It was recently reported that HCHMW has a limited application in Daqing, which does not agree with observations from laboratory core flooding and early field tests. However, the cause of this discrepancy is unclear. Thus, a systematic summary of polymer-flooding mechanisms and field tests in China is necessary. This paper explained why HCHMW is not widely used when considering new understandings of polymer-flooding mechanisms. Different opinions on the viscoelasticity effect of polymers on ROS reduction were critically reviewed. Other mechanisms of polymer flooding, such as wettability change and gravity stability effect, were discussed with regard to widely reported laboratory tests, which were explained in terms of the viscoelasticity effects of polymers on ROS. Recent findings from Chinese field tests were also summarized. Salt-resistance polymers (SRPs) with good economic performance using produced water to prepare polymer solutions were very economically and environmentally promising. Notable progress in SRP flooding and new amphiphilic polymer field tests in China were summarized, and lessons learned were given. Formation blockage, represented by high injection pressure and produced productivity ability, was reported in several oil fields due to misunderstanding of polymers' injectivity. Although the influence of viscoelastic polymers on reservoir conditions is unknown, the injection of very viscous polymers to displace medium-to-high viscosity oils is not recommended. This is especially important for old wells that could cause damage. This paper clarified misleading notions on polymer-flooding implementations based on theory and practices in China.

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Benchmarking the potential of a resistant green hydrocolloid for chemical enhanced oil recovery from sandstone reservoirs

Nowrouzi,

Mohammadi,

Khaksar Manshad

2024

Can J Chem Eng

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Polymer injection into oil reservoirs stands as a primary technique for enhanced oil recovery (EOR), employing either natural or synthetic polymers that dissolve in water. Proper performance in salinity and reservoir temperature creates a limitation to replace natural material with common chemicals and this has led researchers to try to identify new material for this application. Continuing the efforts and overcoming the challenge, this research introduces and examines a high‐performance natural polymer extracted from garden cress seeds for this application. Several experiments were planned and executed based on the existing EOR standards and literature. Comprehensive analyses and viscosity measurements were performed to identify the behaviour of solutions and the effects of concentration, shear rate, salinity, and temperature. Essential tests such as wettability and polymer adsorption were also done by contact angle measurement and flooding into a sandstone plug, respectively. The produced polymer was able to effectively maintain the viscosification properties at temperatures up to 95°C. Similarly, increasing the salinity up to 140,000 ppm did not affect its efficiency and the viscosity value remained in the useful range. The viscosity of the mature solutions at 35°C after 30 h at concentrations of 200, 400, 600, 800, 1000, and 1200 ppm was 8.61, 18.59, 31.27, 65.41, 95.38, and 149.75 mPa, respectively. At 1000 ppm and temperatures of 35, 55, 75, and 95°C, the viscosity was 95.38, 90.57, 86.73, and 84.72 mPa · s, respectively. At concentrations of 600, 800, and 1000 ppm, the wettability altered to intermediate‐wet, while at 1200 ppm, altered to water‐wet. Polymer injection caused an increase in recovery equal to 18.6%. The water cut increased with a little delay in the initial volumes of water injection at a high rate and reached its maximum. Then after the injection of 0.3 PV of polymer, there was a sharp and continuous drop until reaching 35% of the production fluid volume.

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Study on the influence of emulsification property of functional polymers on enhanced oil recovery and its mechanism

Cited by 26 publications

References 21 publications

A Hydroxypropyl Methyl Cellulose-Based Graft Copolymer with Excellent Thermothickening and Anti-salt Ability for Enhanced Oil Recovery

A Hydroxypropyl Methyl Cellulose-Based Graft Copolymer with Excellent Thermothickening and Anti-salt Ability for Enhanced Oil Recovery

Recent Advances in Polymer Flooding in China

Benchmarking the potential of a resistant green hydrocolloid for chemical enhanced oil recovery from sandstone reservoirs

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