Evaluation of a novel profile control agent for enhancing an oil‐recovery application

Pu, Wanfen; Wen, Cailin; Li, Rui; Jin, Fang; Wang, Chongyang; Liao, Zhicheng

doi:10.1002/app.43756

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…Furthermore, the higher residual resistance factor was also demonstrated by higher differential pressure under steady flow state. During dynamic physical experiments we observed that commercial 40K gel was extruded from the fractured core due to its weak mechanical integrity as observed in previous research [31] The morphology of the gels after core flooding experiment was examined to correlate the plugging efficiency with macroscopic structures. As shown in Figure 10A the cross-section of the synthetic fracture was completely sealed by the re-crosslinked bulk gel while 40K gel partially plugged the fracture in physical appearance ( Figure 10D).…”

Section: Introductionmentioning

confidence: 68%

Mechanically robust re-crosslinkable polymeric hydrogels for water management of void space conduits containing reservoirs

Wang

Long

Ding

et al. 2017

Chemical Engineering Journal

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A unique preformed particle gel with re-crosslinkable ability to reform bulk gel for chemical enhanced oil recovery of void space conduits containing reservoir is described herein. The formation of the bulk gel was achieved by reversible ionic crosslinks of the preformed particle gels as induced by brine under reservoir conditions. The re-crosslinked hydrogel with ionic features showed rubber-like mechanical behaviors, a critical parameter of the particle gels to increase plugging efficiency. The re-crosslinking ability of the preformed particle gels under different salinity could be controlled by tuning the ionic interactions within the hydrogel. In addition, the long-term thermal stability of the re-crosslinked bulk gel has been demonstrated. Furthermore, the re-crosslinked bulk gels could significantly reduce permeability of large fractures as demonstrated by core flooding experiments compared with traditional preformed particle gels. The re-crosslinkable bulk gel with robust mechanical properties could offer the candidate to block void space conduits containing reservoirs for enhanced oil recovery.

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Section: Introductionmentioning

confidence: 68%

Mechanically robust re-crosslinkable polymeric hydrogels for water management of void space conduits containing reservoirs

Wang

Long

Ding

et al. 2017

Chemical Engineering Journal

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“…The findings of the parallel sand-pack flooding test are shown in Table . The profile improvement rate (PIR) was determined about 85 and 92% using eq , which could be a significant percentage of the diminishing water flow . These findings suggest that 0.30 wt % TiO 2 nanomaterial-reinforced preformed particle gel (NR-PPG) can guide injected water toward the low permeable sand-pack, thus increasing the sweep efficiency.…”

Section: Resultsmentioning

confidence: 82%

Titanium Dioxide Nanomaterial-Reinforced Particle Gel: Development, Characterization, and Performance Evaluation for Water Shutoff Jobs in Heterogeneous Reservoirs

Pandit,

Mahto,

Gopalkrishnan Nair

2024

Energy Fuels

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This current research article aims to fabricate a novel reinforced preformed particle gel to increase oil production and reduce excessive water production. To achieve this objective, the following synthesis procedure was adopted. At the start, the preformed particle gel (PPG) samples were developed with N,Ndimethylacrylamide, acrylic acid, and AMPS as a monomer, and N,Nmethylenebisacrylamide was used as a cross-linker. The TiO 2 nanomaterial was used as a reinforcing agent to enhance the strength characteristics of PPGs by the free radical polymerization mechanism. To characterize the developed samples, i.e., without reinforced preformed particle gel (WR-PPG) and 0.30 wt % titanium dioxide nanomaterial-reinforced preformed particle gel (NR-PPG), the FT-IR spectra, PXRD, FESEM, EDX, and TGA DTG DSC analytical techniques were used. The developed NR-PPG can absorb distilled water and brine (30 000 ppm) up to 95 and 21 times its dry weight, respectively. Furthermore, a complete evaluation of the swelling behavior was performed using several variable parameters such as salinity, pH, temperature, nanomaterial concentration, and monovalent and multivalent ions. The rheology test confirms the formation of the 3d structure and the toughness modulus (G′) of NR-PPG, i.e., 1168 and 2085 Pa, and WR-PPG, i.e., 980 and 1334 Pa, for distilled water and 30 000 ppm brine solution, respectively. Additionally, the long-term temperature stability test of NR-PPG revealed outstanding thermal stability for 130 days at 120 °C in a brine solution containing 30 000 ppm NaCl. Finally, the core flooding test was used to evaluate the performance of NR-PPG and WR-PPG for the application of water shutoff jobs, and the plugging efficiency of 94−97 and 89−95% in terms of permeability reduction was observed for NR-PPG and WR-PPG, respectively. As a result, the newly synthesized novel NR-PPG may improve water shutoff and oil recovery in mature oil fields.

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“…On the contrary, PGs can eliminate the risks of treatment failure since they are prepared at surface facilities before injection . Typically, PGs are three‐dimensional polymer crosslinked by stable crosslinkers such as N,N′ ‐methylenebisacrylamide, and they swell in the presence of water, plugging the highly permeable zones thus allowing the chasing fluid to divert to the oil‐bearing zones so as to improve sweep efficiency .…”

Section: Introductionmentioning

confidence: 99%

Hydrolysable preformed gels for conformance control in oilwells: Properties and degradation

Wang

et al. 2017

J of Applied Polymer Sci

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Conformance control using preformed gels (PGs) is an effective method to reduce water cut in production oilwells. However, PGs are unable to thicken formation of water, and the improvement of water-oil mobility is limited. Compared with PGs, hydrolysable PGs (HPGs) with labile crosslinker incorporated could thicken the brine gradually. In this study, a series of HPGs were prepared based on labile crosslinker poly(ethylene glycol) diacrylate, self-crosslinker N,N-dimethylacrylamide (DMAM), and nanomaterial laponite. The long-term thermal stability, swelling property, and thickening power of the HPGs were successively examined. It was demonstrated that DMAM remarkably improved the long-term thermal stability of HPGs, and also imparted the swelling and thickening properties during aging period, while laponite effectively increased the viscosity of HPGs suspension but weakened the swelling ratio. Degradation monitored by nuclear magnetic resonance spectroscopy indicated that HPGs are decrosslinked gradually through the hydrolysis of labile crosslinker and then release a terpolymer of acrylamide, acrylate, and DMAM. The hybrid fluid containing the terpolymer and nanomaterial resulted in the increased viscosity of HPGs suspension. Artificial core flooding results showed that HPGs have good sealing capacity for conformance control, and incremental oil was recovered by using HPGs against traditional PGs with similar plugging efficiency owing to the increased viscosity of the HPGs dispersion.

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Evaluation of a novel profile control agent for enhancing an oil‐recovery application

Cited by 7 publications

References 23 publications

Mechanically robust re-crosslinkable polymeric hydrogels for water management of void space conduits containing reservoirs

Mechanically robust re-crosslinkable polymeric hydrogels for water management of void space conduits containing reservoirs

Titanium Dioxide Nanomaterial-Reinforced Particle Gel: Development, Characterization, and Performance Evaluation for Water Shutoff Jobs in Heterogeneous Reservoirs

Hydrolysable preformed gels for conformance control in oilwells: Properties and degradation

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