Experimental study on water flooding mechanism in low permeability oil reservoirs based on nuclear magnetic resonance technology

Wei, Jiang; Zhang, Dong; Zhang, Xin; Zhao, Xiaoqing; Zhou, Runnan

doi:10.1016/j.energy.2023.127960

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…These variations stem predominantly from the comprehensive exchange of water and oil between fractures and the matrix, coupled with imbibition phenomena, particularly in sufficiently elongated rock samples. Upon scrutiny of magnified segments, it becomes evident that during the water-free oil production period, distinctive fracture scales trigger “stepwise” ascent in pressures for A-1 and 1B-6, which diverges from outcomes observed in the conventional low-permeability sample 20A-3 . The pressure 1 of B-1 initially increases to 2.5 MPa followed by a decrease in the pressure of the fluid flowing through the natural fracture area to 1.2 MPa.…”

Section: Resultsmentioning

confidence: 90%

“…Upon scrutiny of magnified segments, it becomes evident that during the waterfree oil production period, distinctive fracture scales trigger "stepwise" ascent in pressures for A-1 and 1B-6, which diverges from outcomes observed in the conventional low-permeability sample 20A-3. 42 The pressure 1 of B-1 initially increases to 2.5 MPa followed by a decrease in the pressure of the fluid flowing through the natural fracture area to 1.2 MPa. As it reaches the matrix area, the permeability decreases, resulting in a rise in the pressure to 3.3 MPa and an increase in seepage resistance.…”

Section: Resultsmentioning

confidence: 99%

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Experimental Study on Waterflooding Characteristics of a Large-Scale Physical Low-Permeability Model Based on a Similarity Criterion

Jiao,

Zhang,

Hou

et al. 2023

Energy Fuels

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Experimental Study on Waterflooding Characteristics of a Large-Scale Physical Low-Permeability Model Based on a Similarity Criterion

Jiao,

Zhang,

Hou

et al. 2023

Energy Fuels

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“…In the process of water flooding, it is more and more difficult to improve oil recovery, and the water cut of oil wells is also increasing. In the late stage of oilfield development, longterm water injection will affect the pore medium in the reservoir, resulting in reservoir heterogeneity [4][5][6], thus greatly reducing water-injection efficiency and oil recovery [7,8]. In order to change the current situation of high water cut in oil wells and improve oil recovery, reasonable measures must be taken to control the high permeability channels between oil and water wells [9,10].…”

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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“…Li et al analyzed the development characteristics and oil content of tight reservoirs from the aspects of core, thin section, and imaging logging and established a logging curve analysis method. Wei et al studied the oil–water distribution characteristics of tight reservoirs in different water injection stages by using the nuclear magnetic resonance method and analyzed the distribution mechanism of remaining oil in pores of different sizes. Sun et al − analyzed the flow patterns of fluids in unconventional reservoirs and found that the microscopic mechanism of solid–liquid interaction is significant.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Oil Recovery of Tight Oil Reservoirs in Different Oil Occurrence States

Zhou,

Wei,

Liu

et al. 2023

Energy Fuels

Self Cite

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The occurrence state of crude oil in tight reservoirs is complex and is significantly influenced by different development methods. In this paper, first, a core-scale static imbibition/dynamic huff and puff and frozen slice residual oil joint testing experimental technology is developed. Second, fluorescence images of tight reservoir cores in different states are tested using the laser confocal method under different conditions. Third, the amounts of crude oil in different occurrence states are quantitatively identified. The results show the following: (a) Under static imbibition conditions, pressurization will increase the recovery of free-state crude oil, reduce the recovery of semibound-state crude oil, and increase the recovery of bound-state crude oil. (b) Under static imbibition conditions, both imbibition systems will use a large amount of free-state crude oil, a small amount of semibound-state crude oil, and a very small amount of bound-state crude oil. The ability of PAM-type slick water system to utilize free crude oil is stronger than that of anionic nonionic surfactants. The ability to use semibound-state and bound-state crude oil is weaker than that of the anionic nonionic surfactant system. (c) Increasing soaking time under dynamic huff and puff conditions will increase the recovery of free-state crude oil and reduce the recovery of semibound-state and bound-state crude oil. (d) The ability of static imbibition to utilize free-state crude oil is stronger than that of dynamic huff and puff. The ability of static imbibition to produce semibound-state crude oil is weaker than that of dynamic huff and puff. The capacity of producing bound-state crude oil is the same as that of dynamic huff and puff.

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Experimental study on water flooding mechanism in low permeability oil reservoirs based on nuclear magnetic resonance technology

Cited by 6 publications

References 27 publications

Experimental Study on Waterflooding Characteristics of a Large-Scale Physical Low-Permeability Model Based on a Similarity Criterion

Experimental Study on Waterflooding Characteristics of a Large-Scale Physical Low-Permeability Model Based on a Similarity Criterion

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

Experimental Study on Oil Recovery of Tight Oil Reservoirs in Different Oil Occurrence States

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