A novel profile modification HPF-Co gel satisfied with fractured low permeability reservoirs in high temperature and high salinity

Li, Ya-Kai; Hou, Ji-Rui; Wu, Wei-Peng; Qu, Ming; Liang, Tuo; Zhong, Wei-Xin; Wen, Yu-Chen; Sun, Hai-Tong; Pan, Yi-Nuo

doi:10.1016/j.petsci.2023.08.019

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…At present, the heterogeneous-compound flooding based on micro-dispersed gel can expand the sweep by the viscosity of the micro-dispersed-gel solution plugging the water channel [32][33][34]. By combining the micro-dispersed gel [35] with the surfactant, the mechanism of plugging the high-permeability channel [36,37], low interfacial tension [38][39][40][41], and wettability reversal [42,43] can be realized in the displacement stage to improve the oil recovery rate.…”

Section: Introductionmentioning

confidence: 99%

Study on the Adaptability Evaluation of Micro-Dispersed-Gel-Strengthened-Alkali-Compound System and the Production Mechanism of Crude Oil

Wang,

Wu,

Liu

et al. 2024

Processes

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A novel micro-dispersed-gel (MDG)-strengthened-alkali-compound flooding system was proposed for enhanced oil recovery in high-water-cut mature oilfields. Micro-dispersed gel has different adaptability and application schemes with sodium carbonate and sodium hydroxide. The MDG-strengthened-alkali flooding system can reduce the interfacial tension to an ultra-low interfacial-tension level of 10−2 mN/m, which can reverse the wettability of rock surface. After 30 days aging, the MDG-strengthened-Na2CO3 flooding system has good viscosity retention of 74.5%, with an emulsion stability of 79.13%. The enhanced-oil-recovery ability of the MDG-strengthened-Na2CO3 (MDGSC) flooding system is 43.91%, which is slightly weaker than the 47.78% of the MDG-strengthened-NaOH (MDGSH) flooding system. The crude-oil-production mechanism of the two systems is different, but they all show excellent performance in enhanced oil recovery. The MDGSC flooding system mainly regulates and seals micro-fractures, forcing subsequent injected water to enter the low-permeability area, and it has the ability to wash the remaining oil in micro-fractures. The MDGSH flooding system mainly removes the remaining oil on the rock wall surface in the micro-fractures by efficient washing, and the MDG particles can also form weak plugging of the micro-fractures. The MDG-strengthened-alkali flooding system can be used as an alternative to enhance oil recovery in high-water-cut and highly heterogeneous mature oilfields.

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Section: Introductionmentioning

confidence: 99%

Study on the Adaptability Evaluation of Micro-Dispersed-Gel-Strengthened-Alkali-Compound System and the Production Mechanism of Crude Oil

Wang,

Wu,

Liu

et al. 2024

Processes

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“…Low-permeability reservoirs are abundant in oil and gas resources, characterized by wide distribution and huge reserves, playing a pivotal role in ensuring the stable and secure development of the worldwide economy and society. 1,2 However, the development of low-permeability reservoirs faces numerous challenges, such as tight rocks, small pores, and poor formation permeability, leading to increased waterflooding pressure, limited sweep efficiency, and low recovery degrees. 3,4 In recent years, the development and application of nanotechnology in the field of oil exploration have become increasingly widespread, 5,6 with many nanomaterials becoming important forces in improving oil recovery.…”

Section: Introductionmentioning

confidence: 99%

Dispersion Stability and Oil Displacement Effect of Modified Black Nanosheet

Zhu,

Qin,

Gao

et al. 2024

Energy Fuels

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“…As the development of conventional oil reservoirs enters the middle and later stages, the development of ultralow-permeability oil reservoirs is gradually becoming a focal point in the global petroleum industry. − Ultralow-permeability oil reservoirs are gradually becoming one of the important unconventional resources to meet global energy demands. , Moreover, ultralow-permeability oil reservoirs have abundant reserves; therefore, the development of ultralow-permeability oil reservoirs has a broad prospect. − However, they pose considerable challenges due to their small pore throats and high fluid flow resistance. , Challenging water injection phenomena frequently occur during water injection process, which can damage the reservoir structure and reduce its productivity. , …”

Section: Introductionmentioning

confidence: 99%

Development of Anionic-Modified Black Nanosheet and Its Oil Imbibition Performance in Ultralow-Permeability Reservoirs

Zhu,

Gao,

Bai

et al. 2024

Energy Fuels

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Ultralow-permeability oil reservoirs are characterized by small pore throats, ultralow permeability, and high fluid flow resistance, which often lead to challenging injection during water flooding processes. Black nanosheet, as an emerging sheet-like nano oil displacement material, can alter the wettability of reservoir rocks, effectively improving water injection performance. However, its dispersion stability in an aqueous solution is insufficient, leading to probable aggregation during water flooding and affecting the oil recovery efficiency. In this study, anionic-modified black nanosheet was developed using a chemical method. The dispersion stability of the anionic-modified black nanosheet was evaluated by using a multiple light stability analyzer and a ζ-potential analyzer. Additionally, the interfacial properties were assessed with a contact angle measurement instrument and emulsification experiments. Finally, the imbibition performance in ultralow-permeability oil reservoirs was evaluated through imbibition experiments combined with nuclear magnetic resonance technology. Results showed that sulfonate groups can be grafted onto black nanosheets by chemical methods. Anionic-modified black nanosheet exhibited a black sheet-like structure, showing potential applicability in ultralow-permeability oil reservoirs. The transmittance stability index (TSI) value of the anionic-modified black nanosheet decreased from 14.26 to 3.33, and the absolute value of ζ-potential increased from 10.4 to 27.5 mV, indicating significantly improved dispersion stability. The effect of anionic-modified black nanosheet on altering the surface wettability of oil-saturated rocks was more pronounced, and the crude oil emulsification effect was also enhanced. In addition, solutions of modified black nanosheets showed a better imbibition oil recovery performance. The nuclear magnetic resonance (NMR) T 2 spectrum revealed at the microscopic scale that the modified black nanosheet could facilitate the better imbibition from the small pores of ultralow-permeability reservoir core samples, thereby enhancing the efficiency of microscopic flooding.

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A novel profile modification HPF-Co gel satisfied with fractured low permeability reservoirs in high temperature and high salinity

Cited by 4 publications

References 40 publications

Study on the Adaptability Evaluation of Micro-Dispersed-Gel-Strengthened-Alkali-Compound System and the Production Mechanism of Crude Oil

Study on the Adaptability Evaluation of Micro-Dispersed-Gel-Strengthened-Alkali-Compound System and the Production Mechanism of Crude Oil

Dispersion Stability and Oil Displacement Effect of Modified Black Nanosheet

Development of Anionic-Modified Black Nanosheet and Its Oil Imbibition Performance in Ultralow-Permeability Reservoirs

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