Investigation on matching relationship between dispersed particle gel (DPG) and reservoir pore-throats for in-depth profile control

Dai, Caili; Liu, Yifei; Zou, Chenwei; You, Qing; Yang, Shuai; Zhao, Mingwei; Zhao, Guang; Wu, Yining; Sun, Yongpeng

doi:10.1016/j.fuel.2017.06.076

Cited by 104 publications

(55 citation statements)

References 26 publications

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“…The pressure fluctuates continuously in a small range during subsequent water flooding, which reflects the continuous migration, blocking, remobilization and redistribution of the heterogeneous composite flooding system. And the injection pressure remains high throughout the process, indicating that the system has good resistance to erosion (Dai et al, 2017;Gong et al, 2017).…”

Section: Sealing-migration Law In Porous Mediamentioning

confidence: 99%

Research on heterogeneous compound flooding system based on dispersed particle gel

Lĭ

Wang

Han

et al. 2019

Adv. Geo-Energy Res.

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Aiming at addressing the problem that the remaining oil maintains wide distribution after polymer flooding and the existing chemical compound flooding systems lack extensive application, a heterogeneous compound flooding system based on dispersed particle gel (DPG) is proposed as an alternative technology for enhanced recovery after polymer flooding. This study designs and characterizes the heterogeneous compound flooding system, as well as its impact factors, and field trial performances. With the systematic viscosity and oil-water interfacial tension as evaluation indicators, the field trial performance of the heterogeneous polymer flooding system is optimized and evaluated based on DPG. The results show that the systematic viscosity is 12.1 to 17.3 mPa·s while the interfacial tension keeps constant at 10 −3 mN/m magnitude. At 80 • C, with 60 days aging, the viscosity retention ratio of the system is over 83.5%, and the interfacial tension between oil and water is still maintained at 10 −3 mN/m. The results of core flooding experiment show that the heterogeneous compound flooding system exhibits good injection performance, moving characteristics of plugging, breakthrough migration and re-plugging. After hightemperature aging, subsequent water flooding still sustains at high pressure with high resistance to erosion. Through the selective high and low permeability layers, the water injection profile is improved, and eventually oil recovery is enhanced to 20.61% after polymer flooding.

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Section: Sealing-migration Law In Porous Mediamentioning

confidence: 99%

Research on heterogeneous compound flooding system based on dispersed particle gel

Lĭ

Wang

Han

et al. 2019

Adv. Geo-Energy Res.

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“…Zaitoun et al (2007) reported a field application of microgels in a gas storage reservoir and showed the existence of an optimal gel size of ∼2 µm for plugging of the high-permeability layer. Dai et al (2017) defined a matching factor to investigate the matching relationship between the particle size and the pore-throat size, and they found that the optimized matching factor ranged from 0.21 to 0.29. If the plugging effect was the only mechanism for EOR, the application of this method had to be very picky and limited.…”

Section: Introductionmentioning

confidence: 99%

Self-adaptive preferential flow control using displacing fluid with dispersed polymers in heterogeneous porous media

et al. 2020

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“…The research results show that the stability of the PMs plays a decisive role in deep profile control (Afeez et al, 2018 ). If the stability is not good, the PMs will be absorbed in near the well-bore and plug the injection channel near the well-bore; thus, the purpose of in-deep profile control will not be achieved (Dai et al, 2017 ). In order to obtain PMs with better stability, many types of PMs have been developed (Hua et al, 2014 ; Mehta et al, 2015 ; Yang et al, 2017b ).…”

Section: Introductionmentioning

confidence: 99%

Field Application of Nanoscale Polymer Microspheres for In-Depth Profile Control in the Ultralow Permeability Oil Reservoir

Hou

Zhao

Jia³

et al. 2020

Front. Chem.

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Much research has been carried out on nanoscale polymer microspheres (PMs) in laboratories in recent years. However, there are limited reports on the practical application of nanoscale PMs in ultralow permeability reservoirs. This paper reports a field application case of nanoscale PMs for in-depth profile control in the ultralow permeability oil reservoir. In the paper, the characteristics of the reservoir and the problems faced during development are analyzed in detail. Then, the PMs with calibration diameters of 300 nm and 800 nm are researched by evaluation experiments, and are selected for in-depth profile control in the ultralow permeability oil reservoir. Finally, according to the effect of the pilot application, the performance of PMs is evaluated, and a more suitable size for the pilot test reservoir is determined. The experiment's results show that the PMs have a good capacity for swelling and plugging. For the PMs with a calibration diameter of 300 nm, the final equilibrium swelling ratio is 56.2 nm·nm −1 , and the maximum resistance coefficient and the blocking rate after swelling are 3.7 and 70.31%, respectively. For the PMs with a calibration diameter of 800 nm, the final equilibrium swelling ratio is 49.4 nm·nm −1 , and the maximum resistance coefficient the blocking rate after swelling are 3.5 and 71.42%, respectively. The performance evaluation results show that nanoscale PMs can be used for in-depth profile control in the ultralow permeability oil reservoir. After the application of PMs in the pilot test area, the average water cut decreased by 10.4%, the average liquid production of single well-increased by 0.9 t/d, and the average thickness of the water-absorbing layer increased by 1.77 m. Comparing the dynamic data variation of well-groups using the PMs with the calibration diameter as 800 nm and the calibration diameter as 300 nm, it indicates that, for the pilot test area, PMs with a calibration diameter of 300 nm are more suitable than PMs with a calibration diameter of 800 nm.

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Investigation on matching relationship between dispersed particle gel (DPG) and reservoir pore-throats for in-depth profile control

Cited by 104 publications

References 26 publications

Research on heterogeneous compound flooding system based on dispersed particle gel

Research on heterogeneous compound flooding system based on dispersed particle gel

Self-adaptive preferential flow control using displacing fluid with dispersed polymers in heterogeneous porous media

Field Application of Nanoscale Polymer Microspheres for In-Depth Profile Control in the Ultralow Permeability Oil Reservoir

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