Study of the mechanisms of streamline-adjustment-assisted heterogeneous combination flooding for enhanced oil recovery for post-polymer-flooded reservoirs

Du, Qiangguo; Pan, Guangming; Hou, Jirui; Guo, Lanlei; Wang, Rongrong; Xia, Zhizeng; Zhou, Kang

doi:10.1007/s12182-019-0311-0

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…After water flooding, the oil saturation in the original unswept area was still high, and the displacement efficiency was low [36]. According to previous experiments [39], the HPC system effectively blocked the dominant channels, expanding the water flooding range, and the well pattern densification and adjustment expanded the scope of the HPC system, which played a guiding role in the HPC system. In order to study the influence of the HPC system under different well patterns, five WAHPCF schemes were designed on the basis of well pattern densification and adjustment.…”

Section: Dynamic Sweep Evaluation In Wahpcf Experimentsmentioning

confidence: 88%

“…flooding [39,40]. This method adjusts the well pattern after polymer flooding to produce crude oil in the unswept areas and increase the action range of the HPC system, thereby significantly expanding the swept area and enhancing oil recovery.…”

Section: Dynamic Sweep Evaluation In Hpcf Experimentsmentioning

confidence: 99%

“…The efficient development of unswept remaining oil is the key to improving oil recovery [39]. After HPC flooding, due to the high-permeability channel between the injection and production wells, there was still a large amount of oil remaining in the non-mainstream areas, with a limited increase in the sweep efficiency, especially for the strongly heterogeneous model.…”

Section: Dynamic Sweep Evaluation In Waf Experimentsmentioning

confidence: 99%

“…Therefore, research on a combination of the HPC system and a well pattern adjustment (WA) has attracted extensive attention. Sun et al studied the synergistic effect of streamline adjustment and HPC flooding after polymer flooding [39,40]. This method adjusts the well pattern after polymer flooding to produce crude oil in the unswept areas and increase the action range of the HPC system, thereby significantly Gels 2023, 9, 364 3 of 23 expanding the swept area and enhancing oil recovery.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Sweep Experiments on a Heterogeneous Phase Composite System Based on Branched-Preformed Particle Gel in High Water-Cut Reservoirs after Polymer Flooding

Zhang

Liu

et al. 2023

Gels

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Heterogeneous phase composite (HPC) flooding technology that is based on branched-preformed particle gel (B-PPG) is an important technology for enhancing oil recovery in high water-cut reservoirs. In this paper, we conducted a series of visualization experiments under the condition of developed high-permeability channels after polymer flooding, with respect to well pattern densification and adjustment, and HPC flooding and its synergistic regulation. The experiments show that for polymer-flooded reservoirs, HPC flooding can significantly reduce the water cut and increase oil recovery, but that the injected HPC system mainly advances along the high-permeability channel with limited sweep expansion. Furthermore, well pattern densification and adjustment can divert the original mainstream direction, which has a positive effect on HPC flooding, and can effectively expand the sweeping range under the synergistic effect of residual polymers. Due to the synergistic effect of multiple chemical agents in the HPC system, after well pattern densification and adjustment, the production time for HPC flooding with the water cut lower than 95% was significantly prolonged. In addition, conversion schemes, in which the original production well is converted into the injection well, are better than non-conversion schemes in terms of expanding sweep efficiency and enhancing oil recovery. Therefore, for well groups with obvious high-water-consuming channels after polymer flooding, the implementation of HPC flooding can be combined with well pattern conversion and intensification in order to further improve oil displacement.

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Section: Dynamic Sweep Evaluation In Wahpcf Experimentsmentioning

confidence: 88%

Section: Dynamic Sweep Evaluation In Hpcf Experimentsmentioning

confidence: 99%

Section: Dynamic Sweep Evaluation In Waf Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic Sweep Experiments on a Heterogeneous Phase Composite System Based on Branched-Preformed Particle Gel in High Water-Cut Reservoirs after Polymer Flooding

Zhang

Liu

et al. 2023

Gels

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“…For strongly heterogeneous reservoirs, however, the resistance increase performance of polymer solution in the thief zones via adsorption and viscosity increase is not satisfactory, and fluid fingering or channeling may occur. , In addition, due to the polymer’s shearing, dilution, and degradation in the formation, its viscosity will decrease. , For these reasons, it is difficult to further increase the swept volume and extract extra oil in the low-permeability zones that need to be developed urgently. Therefore, there is a need for chemical agents with more excellent conformance control performance. − …”

Section: Introductionmentioning

confidence: 99%

Determination of Permeability Contrast Limits for Applying Polymer Solutions and Viscoelastic Particle Suspensions in Heterogeneous Reservoirs

Zhou

Zhao

et al. 2022

Energy Fuels

Self Cite

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Polymers and viscoelastic particles are the main chemical agents used to improve water injection profile and thus increase oil production. In actual formations, however, there is a lack of knowledge on selecting an appropriate chemical agent to achieve excellent conformance control and oil production performance. To address this issue, this paper first investigated the main rheological properties and resistance increase performance of the two chemical agents. After that, the permeability contrast limits for applying polymer solution and viscoelastic particle suspension in heterogeneous reservoirs were determined through shunt flow experiments. The critical impact of permeability contrast limits on chemical enhanced oil recovery (EOR) was further verified via a two-dimensional (2D) visualized oil displacement experiment. It was found that the particles exhibit superior elasticity, while the polymers mainly exhibit a viscosity increase effect. The resistance increase capacity of the particle suspension in the core was more potent than that of the polymer solution, which results in its excellent conformance control in strongly heterogeneous cores. On the contrary, the polymer solution might face the risk of failure. The permeability contrast limits for applying the two chemical agents at different concentrations were determined. Visualized oil displacement experiments showed that the EOR by polymer flooding in strongly heterogeneous reservoirs is quite low (3.3%). In contrast, the particle suspension could effectively expand the swept zone and extract considerable remaining oil in the low-permeability zones. Accordingly, the EOR could reach 7.1%. Determining permeability contrast limits is of practical significance for selecting suitable chemical agents to realize successful conformance control and oil extraction in heterogeneous reservoirs.

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Mechanism and visualization of streamline adjustment in enhanced oil recovery: a comparative study between well pattern adjustment and polymer flooding

Dong

Wang

et al. 2023

J Petrol Explor Prod Technol

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Due to the long-term scouring of steam/water flooding, the water channels restricts the expansion of streamlines in the swept region. The formation of the main streamline, an inevitable and troublesome challenge during steam/water flooding, restrict the spread of the sweep region and the oil extraction in oil reservoirs. To realize the swept main streamlines adjustment (SA), well pattern adjustment (WPA) and polymer flooding (PF) are the mature technologies applied in the development of reservoir. The WAF and PF, as two kinds of oil extracting methods with different principles and operations, is difficult to directly verify the disturbance law to main streamlines in the same model or experimental physical field. Two-dimensional sand-packed model can elucidate the mechanism of WPA and PF for SA based on the direct processing of images and data analysis of production data. Through the oil–water distribution images from displacement experiment, the influence of viscous fingering generated by streamlines development can be obtained and described by the mathematical model to illustrate the relationship between penetration intensity and mobility ratio. In addition, the dynamic production data can reflect the change of flow resistance and water cut during the expansion of swept region. Based on observations of macro and micro perspectives, the experimental results show that the WPA greatly expands the coverage region of the streamlines, while PF makes the streamlines denser in the swept region. By comparing the distribution of streamlines between the two methods, the different shapes of streamlines are deeply influenced by the mobility ratio that determines the viscous fingering and the well pattern type. Finally, the adaptability of different methods for extracting the remaining oil is proposed. The WPA pays attention to improving the macro sweep efficiency outside the swept region. Meanwhile, the PF strategy pays more attention to improving the micro sweep efficiency in the swept region. The analysis of single-factor shows that viscous fingering has an obvious interference effect on the streamline morphology development, which highlights the meaning and importance of using the synergistic effect of WPA and PF to enhance oil recovery.

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Study of the mechanisms of streamline-adjustment-assisted heterogeneous combination flooding for enhanced oil recovery for post-polymer-flooded reservoirs

Cited by 14 publications

References 33 publications

Dynamic Sweep Experiments on a Heterogeneous Phase Composite System Based on Branched-Preformed Particle Gel in High Water-Cut Reservoirs after Polymer Flooding

Dynamic Sweep Experiments on a Heterogeneous Phase Composite System Based on Branched-Preformed Particle Gel in High Water-Cut Reservoirs after Polymer Flooding

Determination of Permeability Contrast Limits for Applying Polymer Solutions and Viscoelastic Particle Suspensions in Heterogeneous Reservoirs

Mechanism and visualization of streamline adjustment in enhanced oil recovery: a comparative study between well pattern adjustment and polymer flooding

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