Environmental pollution monitoring in Dongying administrational area, yellow river delta, Shandong Province, China

Zhao, Gang; Wang, Zhaowen; Schnabel, Werner Wilhelm; Kaiser, Joachim

doi:10.1080/02772249909358825

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…The thickening effect of polymers plays a significant role in chemical flooding methods aimed at improving oil recovery. , Figure illustrates the viscosity of the two systems at various polymer concentrations. The findings indicate that the viscosity–concentration relationship of the alkali-free TC system closely resembles that of the weak alkali ASP system within the polymer concentration range of 1000–2400 mg/L.…”

Section: Resultsmentioning

confidence: 99%

Study on the Alkali-Free Three-Component Flooding System in the Daqing Oilfield

Liu,

Wu,

Chen

et al. 2024

ACS Omega

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ASP flooding is an important method to further improve oil recovery by a large margin. At present, it has entered the stage of industrial application, but there are still problems of scaling in the injection production system and high production maintenance costs. Based on the industrialized mature technology of weak alkali ASP flooding, sodium chloride is used to replace sodium carbonate, and the alkali-free three-component flooding (TC) system in the Daqing Oilfield is developed by mixing with petroleum sulfonate and partially hydrolyzed polyacrylamide. Based on the experiments of viscosity increasing, interface performance, stability, adsorption, and oil displacement effect, the differences between the alkali-free TC system and the weak alkali ASP system are compared and analyzed. The laboratory research results show that both systems are basically the same in terms of viscosity, viscoelasticity, shear resistance, interfacial activity, stability, and flowability. Due to the lack of alkaline water, the adsorption, emulsification, and oil displacement performance of the alkali-free TC system is slightly lower than that of the weak alkali ASP system. The recovery factor of core flooding can be increased by 27.31% over water flooding, which is 2.56 percentage points lower than that of the weak alkali ASP system. On the premise of the same 1% EOR effect, the agent cost of the alkali-free system is 17.02% lower than that of the alkali ASP system. This article innovatively verifies the feasibility of using NaCl instead of Na 2 CO 3 and explains the mechanism of significantly improving oil recovery in composite systems under alkali-free conditions from the ion level. However, the emulsification effect of the alkali-free TC system is relatively weak. The next step of research would be to consider adding an E-surfactant to enhance the emulsification performance of the composite system. By improving the system composition, technical references are provided for the efficient development of other terrestrial sandstone oilfields.

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Section: Resultsmentioning

confidence: 99%

Study on the Alkali-Free Three-Component Flooding System in the Daqing Oilfield

Liu,

Wu,

Chen

et al. 2024

ACS Omega

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“…Because experiment velocity is lower than the critical flow velocity, the damage should be attributed to swollen clays occupying the pore space. Reference reported that, clays (especially montmorillonite) in the porous medium can adsorb water on their surfaces and edges, and even between layers of the basic particle (Zhao, 1999). A decrease in ion concentration in the fluid surrounding a particle causes migration of water into the clay layers and disperses the basic particle, while diffusion removes the original exchangeable ions from between the platelets.…”

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confidence: 99%

“…A decrease in ion concentration in the fluid surrounding a particle causes migration of water into the clay layers and disperses the basic particle, while diffusion removes the original exchangeable ions from between the platelets. Once these ions are removed, the facing negative platelets repel each other, the montmorillonite swell, causing permeability reduction of porous medium (Atwood, 1964;Zhao, 1999). Fresh water was pumped for steam producer which provide saturated steam.…”

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confidence: 99%

Improvement of Porous Medium Permeability by Injecting Overheated Steam

Zhou

2013

AMR

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According to laboratory physical simulation methods, Achieve the infiltration experiment of overheated steam in the porous medium. The experiment researched overheated steam’s improvement to damage and undamaged porous mediums. Permeability was increased 1 to 4 times in the damaged porous mediums, 3 to 6 times in those undamaged. The microstructure of porous medium is characterized by scanning electron microscope photos. A lots of mineral microcrystal adhered on the initial rock particle surface. After the infiltration experiment of overheated steam, mineral microcrystal decreased obviously, and the rock particle surface changes into even and smoothly, which made the filtration resistance precipitous declined. Based on theory assumptions, production calculation formulas were derived in some given conditions. And the regular pattern plate map out, which affected by overheated steam heating radius and water-damaged radius. The results turns out that, inject overheated steam can achieve obviously production increasing.

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Environmental pollution monitoring in Dongying administrational area, yellow river delta, Shandong Province, China

Cited by 2 publications

References 5 publications

Study on the Alkali-Free Three-Component Flooding System in the Daqing Oilfield

Study on the Alkali-Free Three-Component Flooding System in the Daqing Oilfield

Improvement of Porous Medium Permeability by Injecting Overheated Steam

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