Study on micro remaining oil distribution of polymer flooding in Class-II B oil layer of Daqing Oilfield

Fang, Yujia; Yang, Erlong; Guo, Shaofeng; Cui, Changyu; Zhou, Changyong

doi:10.1016/j.energy.2022.124479

Cited by 62 publications

(20 citation statements)

References 14 publications

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“…To solve this problem, polymer microspheres are widely used and have been well recognized. , They have low cost and are simple, which are formed by polymerization of monomers under the action of an initiator and have good expansibility. Due to the injection pressure difference, injected polymer microspheres can migrate to the depth of the formation and preferentially enter the pores with large radius and good connectivity . After that, the polymer microspheres gradually spread to the low-permeability region and expand, which can adsorb on a rock surface or plug by agglomeration and prevent water invasion .…”

Section: Introductionmentioning

confidence: 99%

A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

Wang

Yang

et al. 2023

Energy Fuels

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Nanospheres have been used as an available plugging material to solve the problem of water intrusion, which is of crucial importance to enhanced oil recovery (EOR). However, the microflow of nanospheres in a lowpermeability reservoir is complex, and its plugging performance and EOR mechanism need to be further investigated by a variety of experiments. In this paper, the expansion experiments were given priority to explore the water absorption and salt tolerance of nanospheres. The displacement experiments were conducted to investigate the plugging performance of nanospheres at the core scale. The flow characteristic and EOR mechanism of nanospheres at the microscale were revealed by nuclear magnetic resonance (NMR) experiments and microfluidic experiments. Expansion and displacement experiments results demonstrate that high salinity inhibits the expansibility and agglomeration of nanospheres, and the formation damage and plugging performance of nanospheres should be comprehensively considered. The suitable particle size of nanospheres should be optimized for field application. As for the microscale, NMR experiments revealed that nanospheres would first enter the large pore and then enter the middle and small pores. In microfluidic experiments, the oil recovery increased by 23.02% original oil in place after the injection of nanospheres. The systematic and comprehensive investigations of expansion property, plugging performance, flow characteristic, and EOR mechanism of nanospheres were conducted from core to microscale, which yielded significant insights into preventing water intrusion and enhancing oil recovery.

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Section: Introductionmentioning

confidence: 99%

A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

Wang

Yang

et al. 2023

Energy Fuels

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“…Recognizing these limitations, researchers have shifted their focus to the interdependence of permeability and various depositional characteristics such as grain size, pore geometry, and tortuosity, which are influenced by diagenetic factors like cementation, fracturing, and solution [6] . This calls for a new approach to reservoir characterization that considers geological principles and the physics of fluid flow in porous media [7][8][9] . The hydraulic flow unit (HFU) approach is proposed as this solution.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Flow Unit Characterization in Sandstone Reservoirs, Niger Delta, Nigeria

Nwokoma¹,

Ijeh²,

Amos-Uhegbu³

2023

eps

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The key factor in a successful oil field development plan is understanding the reservoir. The effectiveness of oil extraction is determined by variations in the reservoir, specifically the distribution of porosity and permeability. To create an accurate model of the reservoir, the vertical distribution of its qualities must be determined and separated into flow units, each with its own unique characteristics that affect fluid flow. By identifying these flow units, the preferred flow zones can be discovered. The aim of this study is to identify the number and distribution of hydraulic units, their important characteristics, and the flow performance in two specific wells in the Niger Delta, Nigeria, using the Modified Lorenz Plot (MLP) method. In the hydrocarbon-rich intervals of the wells, a total of 18 flow units were found, with 12 in Well 1 and 6 in Well 2. The number of flow units indicates the level of heterogeneity in the reservoir. This study showed that the Modified Lorenz Plot (MLP) is an efficient and low-cost method for defining petrophysical flow units. This research study aims to transform the conventional approach to reservoir characterization by conducting a thorough analysis of hydraulic flow units in sandstone reservoirs located in the complex geological setting of the Niger Delta, Nigeria. By examining the hydraulic properties of reservoir rocks, the study seeks to gain a better understanding of subsurface fluid flow behavior and the potential for hydrocarbon accumulation.

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“…The binary and ASP ooding processes generate ultralow interfacial tension and emulsi cation, but they can enhance oil recovery signi cantly by fully tapping the remaining oil in small and medium pores and on the surface of pores (Liao et al, 2017) Reservoir physical properties also represent an important factor controlling the chemical ooding recovery. Some scholars pointed out that such reservoir physical properties as capillary number (Li et al, 2019), permeability (Tan et al, 2017) and heterogeneity (Li et al, 2021;Lin et al, 2022;Fang et al, 2022) can control chemical ooding recovery. However, the in uence of reservoir types on chemical ooding recovery has scarcely been discussed, and there is no quantitative visualization of remaining oil distribution.…”

Section: Introductionmentioning

confidence: 99%

The influence of permeability and heterogeneity on water flooding–chemical flooding efficiency and remaining oil distribution ——Based on nuclear magnetic resonance displacement imaging

Zhang

Gai

Song

et al. 2023

Preprint

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To clarify the impact of permeability and heterogeneity on oil displacement efficiency and remaining oil distribution of water flooding-chemical flooding, three groups of high and ultrahigh permeability core samples from an ultrahigh water-cut oilfield in western China were selected as the research objects in this study. High-pressure mercury injection, scanning electron microscopy, wettability test, and other methods were used to characterize the reservoir properties of core samples. Six groups of experiments were performed using the nuclear magnetic resonance (NMR) displacement imaging technology to simulate the oilfield development process considering the economic benefits, and the oil displacement efficiency and remaining oil distribution characteristics of water flooding combined with polymer flooding and polymer-surfactant flooding in reservoirs with varying physical properties were discussed. The research shows that during the simulation process of first water flooding followed by chemical flooding and then water flooding in the oilfield, the T2 spectrum signal amplitude increases the most in the two stages, one is from saturated oil flooding to 50% water cut and the other one is from 95% water cut to the end of 1 PV polymer flooding. The oil displacement efficiency increases the most, and the oil is primarily discharged from pore throats larger than 90 ms (or with pore throat radius of 8.37 µm). Higher permeability and the addition of surfactant based on the polymer are beneficial in improving final oil displacement efficiency, and the displacement efficiency is better when the polymer-surfactant binary flooding acts on the reservoir with higher permeability. The fingering phenomenon and remaining oil distribution are controlled by reservoir heterogeneity and gravity: the lower the heterogeneity, the more uniform the remaining oil distribution, and the closer the oil saturation at the experiment’s inlet and outlet. The more heterogeneous the sample, the more obvious is the fingering phenomenon, and the remaining oil is primarily distributed at the outlet end as well as at the top of the sample. The study results provide theoretical guidance for tapping the remaining oil potential of old oilfields with high to ultrahigh permeabilities.

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Study on micro remaining oil distribution of polymer flooding in Class-II B oil layer of Daqing Oilfield

Cited by 62 publications

References 14 publications

A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

Hydraulic Flow Unit Characterization in Sandstone Reservoirs, Niger Delta, Nigeria

The influence of permeability and heterogeneity on water flooding–chemical flooding efficiency and remaining oil distribution ——Based on nuclear magnetic resonance displacement imaging

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