Laboratory evaluation and numerical simulation study on profile modification performance of gel-nitrogen-foam for low permeability formation under fracturing

Chen, Fuzhen; Gu, Junjie; Yao, Xiaoling

doi:10.1080/02726351.2018.1536684

Cited by 7 publications

(3 citation statements)

References 30 publications

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“…Combining the above results, we speculate the following possible reasons: First, the natural gas foamed gel system has good oil stability, thus resulting in the high stability of macropores. In addition, a high seepage resistance was established in large pores, forcing the subsequent displacement phase to flow to more unaffected areas; 54 second, the natural gas foamed gel liquid membrane is highly elastic, which can protect the bubbles from breaking when entering the medium and small pores and expand their spread. Finally, the natural gas foamed gel liquid membrane has a low coarsening rate, which enables the bubbles to block the large pore space in a large range and further improves the recovery factor of the foamed gel.…”

Section: Improvement Of Liquid Absorptionmentioning

confidence: 99%

Research on the Properties of Natural Gas Foamed Gel as a Profile Control and an Oil Displacement Agent in Strong Heterogeneous Reservoirs

Lai

Yuan

Li³

et al. 2021

Energy Fuels

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To alleviate the uneven production of extreme heterogeneous reservoirs, we developed a high-strength natural gas foamed gel system by adding a gel system to the foaming agent solution. The Ostwald ripening rate and the gas molecular diffusion coefficient (D diff) were calculated. The number of bubbles, the average diameter(D ad), and the poly-dispersion coefficient (U poly) of the foamed gel system have been considered within, as well as the different temperature, salinity, pressure, and crude oil conditions and the stability of the foamed gel system. Moreover, combining laboratory displacement experiments and core nuclear magnetic (NMR) experiments, the oil displacement ability of natural gas foamed gel was studied. The results showed that different from the previous phenomenon of “defoaming with oil”, adding a certain amount of crude oil into the natural gas foamed gel could improve its foaming performance. According to this phenomenon, we conducted experiments on the stability and viscosity enhancement of the emulsion and explored the stability of the pseudo-emulsion film of foamed gel. In addition, this natural gas foamed gel system had a better ability to control profile and enhance oil recovery when the permeability ratio was 75–150. When the permeability ratio was 150, the low-permeability core diversion rate was about 38%, and the EOR was 35.27%. Finally, the core NMR results showed that the main contribution of water flooding recovery came from macropores. In construct, the recovery efficiency of natural gas foamed gel system mainly came from medium and small pores (effective areas not affected by water flooding). This study would provide a different thought for foam in production while dealing with extreme heterogeneity formations.

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Section: Improvement Of Liquid Absorptionmentioning

confidence: 99%

Research on the Properties of Natural Gas Foamed Gel as a Profile Control and an Oil Displacement Agent in Strong Heterogeneous Reservoirs

Lai

Yuan

Li³

et al. 2021

Energy Fuels

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“…In this case, gel foam composite profile control and flooding technology are proposed. Gel foam composite profile control and flooding combine the dual advantages of gel and air foam flooding, which can well improve the heterogeneity of the reservoir and has the dual role of oil displacement and profile control [9,10]. This is of great significance to the research on high-efficiency water injection development of low-permeability reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Foam Gel Compound Profile Control and Flooding Technology in Low-Permeability Reservoirs

Cai

Fan

et al. 2023

Processes

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In the waterflooding development of fractured ultra-low permeability reservoirs, the heterogeneity is becoming increasingly serious. The development of large fracture channels leads to serious water channelling and low recovery, and the effect of conventional profile control is not ideal. This paper proposed gel foam composite profile control and flooding technology to solve the above problems. Herein, the new intelligent gel and foaming agent systems were optimized through laboratory experiments, and their performance was evaluated. The new intelligent gel system has the characteristics of low viscosity, easy preparation, good injection, slow cross-linking, high strength, and long-term effectiveness. The injection parameters were optimized, and the indoor injection scheme was formulated, that is, the optimal injection volumes of gel and foam slugs were 0.3 and 0.6 PV, respectively. The injection sequence of composite slugs was to inject gel slugs first, then foam slugs. The injection mode of air foam slugs was multiple rounds of small slug injection. The final recovery rate in the indoor dual tube oil displacement experiment reached 35.01%, increasing by 23.69%. Furthermore, an oil output increase of 899 t and an average water cut decrease of 5% were acquired in the oil field test. It shows that the injection scheme can effectively improve oil recovery. The gel foam compound profile control and flooding technology herein has good adaptability in similar reservoirs and has good promotion prospects.

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“…Exploring and describing the inside pores and fluids via imaging techniques such as CTscanning and nuclear magnetic resonance are one of the methods to achieve the visible development of reservoir by gas flooding. Due to the detail distortion caused by the conversion of photo-electric and magneto-electric signals, overlapping ambiguity, and interference of environmental factors, however, the CT scanning and nuclear magnetic resonance failed to either effectively indicate the microdetails during TSD by gas flooding or clarify the mechanisms of TSD by gas flooding [13,15,[26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Research on Three-Phase Saturation Distribution Based on Microfluidic Visualization Experiment: A Case Study of Ling Xin Mining Area

Hu¹,

Huang²,

Song³

et al. 2022

Geofluids

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Flow characteristics and phase distribution of concentrated brine storage in mining area have been core factors linking to the leakage risk assessment and ecological evaluation. Notably, saturation plays a crucial role in impacting the flow characteristics and distribution of brine, while the existence of oil left by mining machines and original reservoir and gas produced from coal bed gas and air has complicated the issue. In this work, we conducted the microfluidic visualization experiments to reveal the saturation distribution during brine storage in mining area. We applied machine learning model to extract saturation data from experimental images with over 95% accuracy. Eventually, we found that the existence of gas significantly impacts on the saturation distribution in micropores accounting for more than 80% contribution. We clarified that the gas production rate of median 200 μL/min impacts the least on saturation variation. Results in this research are of significance for deeper comprehension on three-phase saturation characteristics of concentrated brine storage in mining area.

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Laboratory evaluation and numerical simulation study on profile modification performance of gel-nitrogen-foam for low permeability formation under fracturing

Cited by 7 publications

References 30 publications

Research on the Properties of Natural Gas Foamed Gel as a Profile Control and an Oil Displacement Agent in Strong Heterogeneous Reservoirs

Research on the Properties of Natural Gas Foamed Gel as a Profile Control and an Oil Displacement Agent in Strong Heterogeneous Reservoirs

Evaluation of Foam Gel Compound Profile Control and Flooding Technology in Low-Permeability Reservoirs

Research on Three-Phase Saturation Distribution Based on Microfluidic Visualization Experiment: A Case Study of Ling Xin Mining Area

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