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

Jiao, Liang; Zhang, Henglei; Hou, Binchi; Cui, Pengxing; Zhao, Jiuyu; Cai, Jianchao

doi:10.1021/acs.energyfuels.3c03159

Cited by 4 publications

(4 citation statements)

References 41 publications

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“…Moreover, its effect on the gelation time and gel strength were analyzed (Figure 3). The gel strength codes (A-I) of the bottle test were converted into numerical values (1)(2)(3)(4)(5)(6)(7)(8)(9). The results showed that there was a noticeable upward trend in both the gelation rate and gel strength as the hydrodynamic radius of the HPAM increased.…”

Section: Resultsmentioning

confidence: 99%

“…The test was carried out at room temperature, at least 3 measurements were taken for each sample, and the results were averaged. The hydrolysis degree of HPAM was calculated via Equation (1).…”

Section: Hpam Hydrolysis Degree Testmentioning

confidence: 99%

“…Low-permeability reservoirs, characterized by low matrix permeability and insufficient natural energy, rely heavily on water injection to maintain efficient development [ 1 , 2 ]. However, long-term water injection often leads to excessive water production, resulting in a range of concerns related to the environment, corrosion, and scale formation.…”

Section: Introductionmentioning

confidence: 99%

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Gelation and Plugging Performance of Low-Concentration Partially Hydrolyzed Polyacrylamide/Polyethyleneimine System at Moderate Temperature and in Fractured Low-Permeability Reservoir

Wang,

Luo,

et al. 2024

Polymers

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HPAM/PEI gel is a promising material for conformance control in hydrocarbon reservoirs. However, its use in low-permeability reservoirs is limited by the high polymer concentrations present. In this study, the gelation performance of an HPAM/PEI system with HPAM < 2.0 wt.% was systematically investigated. The gelation time for HPAM concentrations ranging from 0.4 to 2.0 wt.% varied from less than 1 h to 23 days, with the highest gel strength identified as grade H. The hydrodynamic radius manifested the primary effect of HPAM on the gelation performance. Branched PEI provided superior gelation performance over linear PEI, and the gelation performance was only affected when the molecular weight of the PEI varied significantly. The optimal number ratio of the PEI-provided imine groups and the HPAM-provided carboxylic acid functional groups was approximately 1.6:1~5:1. Regarding the reservoir conditions, the temperature had a crucial effect on the hydrodynamic radius of HPAM. Salts delayed the gelation process, and the order of ionic influence was Ca2+ > Na+ > K+. The pH controlled the crosslinking reaction, primarily due to the protonation degree of PEI and the hydrolysis degree of HPAM, and the most suitable pH was approximately 10.5. Plugging experiments based on a through-type fracture showed that multi-slug plugging could significantly improve the plugging performance of the system, being favorable for its application in fractured low-permeability reservoirs.

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Section: Resultsmentioning

confidence: 99%

Section: Hpam Hydrolysis Degree Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gelation and Plugging Performance of Low-Concentration Partially Hydrolyzed Polyacrylamide/Polyethyleneimine System at Moderate Temperature and in Fractured Low-Permeability Reservoir

Wang,

Luo,

et al. 2024

Polymers

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“…Crude oil is not only the cornerstone of modern industrial energy but also a critical pillar for economic development . With conventional oilfield reserves depleting, low-permeability oilfields have emerged as a vital future source of oil and gas resources . These reservoirs are characterized by low permeability, small pore-throat sizes, poor connectivity, and significant heterogeneity, resulting in high development costs, substantial challenges, and low operational efficiency .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Oil Recovery in Low-Permeability Reservoirs Utilizing Dispersions of Monodisperse Crumpled SiO₂ Nanoparticle

Wang,

Zhang,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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Nanomaterials have great potential as novel materials for enhancing oil recovery in low-permeability reservoirs. Spontaneous aggregation hampers their application effectiveness and may lead to irreversible reservoir damage. In this study, monodisperse crumpled SiO 2 nanoparticles (C-SiO 2 ) with central radial pore channels were synthesized by using the spherical micelle selfassembly method. After hydrophobic modification, modified C-SiO 2 formed a highly stable nanodispersion with the assistance of sodium dodecyl sulfate and octadecanol. Results showed that C-SiO 2 exhibited reduced external surface area, increased active sites, and excellent dispersibility. The C-SiO 2 dispersion demonstrated excellent temperature tolerance (90 °C) and salt resistance (20000 mg/L, including 4000 mg/L Ca 2+ ), outstanding enhanced oil recovery performance, and negligible reservoir damage. Injecting 0.5 pore volume of the C-SiO 2 dispersion at a concentration of 0.025 wt % enhanced oil recovery by 14.25%. The C-SiO 2 dispersion effectively mobilized residual oil through the combined action of multiple mechanisms. This study provides an effective approach to enhancing the development of low-permeability reservoirs. It also advances the understanding of C-SiO 2 synthesis and stable nanodispersion design, which is crucial for future oil recovery applications.

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The Formation Mechanism of Residual Oil and Methods of Enhanced Oil Recovery in a Fractured Low-Permeability Metamorphic Rock Reservoir in Bohai Bay

Gao,

Wang,

Zhang

et al. 2024

Processes

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The oil reservoirs of the metamorphic rocks in Bohai Bay have geological characteristics such as low matrix porosity and permeability, developed natural microfractures, which result in the injection water rapidly advancing along fractures, a fast increase in the water content, and difficulties in extracting the remaining oil. In order to reveal water channeling and the residual oil formation mechanisms in fractured low-permeability reservoirs and solve the water channeling problem, we first analyzed the reservoir development status, then studied the formation mechanism of residual oil using a microfluidic chip device, and formed a method of hierarchical control to effectively control the water channeling problem of fractured reservoirs and maximize the displacement of residual oil. The results show that (1) Due to the low permeability of the reservoir matrix, a large amount of injected water flows along the fracture channel, which leads to the long-term high water cut of some oil wells and the retention of a large amount of crude oil in the matrix. (2) The results of microfluidic experiments show that the distribution of residual oil after water flooding mainly includes five types: blind end of the pore throat, columnar, cluster, flake and film, and residual oil. Among them, sheet-like and clustered residual oil are dominant, accounting for 75~85% and 10~13%, respectively. (3) Based on the characteristics of fracture development in buried-hill reservoirs, a hierarchical control technology of “gel particle + liquid crosslinked gel system” is established. The field application effect predicted that the input–output ratio was 1:3. This study provides a reference for the comprehensive treatment of water channeling in the same type of offshore fractured low-permeability metamorphic rock reservoirs.

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

Cited by 4 publications

References 41 publications

Gelation and Plugging Performance of Low-Concentration Partially Hydrolyzed Polyacrylamide/Polyethyleneimine System at Moderate Temperature and in Fractured Low-Permeability Reservoir

Gelation and Plugging Performance of Low-Concentration Partially Hydrolyzed Polyacrylamide/Polyethyleneimine System at Moderate Temperature and in Fractured Low-Permeability Reservoir

Enhanced Oil Recovery in Low-Permeability Reservoirs Utilizing Dispersions of Monodisperse Crumpled SiO₂ Nanoparticle

The Formation Mechanism of Residual Oil and Methods of Enhanced Oil Recovery in a Fractured Low-Permeability Metamorphic Rock Reservoir in Bohai Bay

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

Cited by 4 publications

References 41 publications

Gelation and Plugging Performance of Low-Concentration Partially Hydrolyzed Polyacrylamide/Polyethyleneimine System at Moderate Temperature and in Fractured Low-Permeability Reservoir

Gelation and Plugging Performance of Low-Concentration Partially Hydrolyzed Polyacrylamide/Polyethyleneimine System at Moderate Temperature and in Fractured Low-Permeability Reservoir

Enhanced Oil Recovery in Low-Permeability Reservoirs Utilizing Dispersions of Monodisperse Crumpled SiO2 Nanoparticle

The Formation Mechanism of Residual Oil and Methods of Enhanced Oil Recovery in a Fractured Low-Permeability Metamorphic Rock Reservoir in Bohai Bay

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Enhanced Oil Recovery in Low-Permeability Reservoirs Utilizing Dispersions of Monodisperse Crumpled SiO₂ Nanoparticle