The Experimental Study on the Changes of Polymer Solution`s Rheological Property in Immediate Vicinity of Wellbore

In order to study the near wellbore area of perforated well and after adsorption detention flow variation of rheological property of polymer solution , artificial physics and artificial cylindrical core model 1:10 are used to do experiments. Results indicate that natural degradation processes of polymer solutions, it is plummeting rapidly within 20 day, then reach stability. Near bore the constant speed when the polymer injection and a variable speed injection, the decreasing amplitude of apparent viscosity caused by the shear factor is approximately 22.5%. In the process of adsorption and detain, injecting 0.8pv polymer, model began to produce polymer. About injecting 2.6pv , adsorption and detain reach stability.

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Experimental Study of Polymer Drag Reduction in a Turbulent Channel Flow

Volume 1: Fora, Parts A, B, C, and D ◽

10.1115/fedsm2003-45658 ◽

2003 ◽

Cited By ~ 3

Author(s):

Xiaochun Shen ◽

Kihyun Kim ◽

Jamison L. Miller ◽

Ryan Sun-Chee-Fore ◽

Ana I. Sirviente

Keyword(s):

Experimental Study ◽

Polymer Solution ◽

Channel Flow ◽

Water Channel ◽

Turbulent Channel Flow ◽

Turbulence Characteristics ◽

Polymer Injection ◽

Turbulent Channel Flows ◽

Polymer Drag Reduction ◽

Turbulent Water

The effect of polymer injection on the turbulence characteristics of a fully developed turbulent water channel flow was studied. The main focus of this study was to assess the influence of the polymer solution injection concentration and consequent mixing. This study was conducted by measuring the turbulence characteristics of two fully developed turbulent channel flows for a Reynolds number of 5×104, with different injection concentrations of the same polymer solution but with the same homogeneous concentration at the test section. These measurements were complemented by visualizations of the flow, which revealed the presence of supra-molecular polymer structures. The development of such structures seems to enhance the drag reducing abilities of the polymer solution.

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An experimental study on the apparent viscosity of sandy soils: from liquefaction triggering to pseudo-plastic behaviour of liquefied sands

Acta Geotechnica ◽

10.1007/s11440-021-01261-2 ◽

2021 ◽

Author(s):

Lucia Mele

Keyword(s):

Experimental Study ◽

Apparent Viscosity ◽

Sandy Soils ◽

Plastic Behaviour

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Study Rheological Behavior of Polymer Solution in Different-Medium-Injection-Tools

Polymers ◽

10.3390/polym11020319 ◽

2019 ◽

Vol 11 (2) ◽

pp. 319 ◽

Cited By ~ 8

Author(s):

Bin Huang ◽

Xiaohui Li ◽

Cheng Fu ◽

Ying Wang ◽

Haoran Cheng

Keyword(s):

Molecular Weight ◽

Polymer Solution ◽

Oil Recovery ◽

Injection Pressure ◽

Injection Rate ◽

Injection Velocity ◽

Structural Parameter ◽

Local Perturbation ◽

Polymer Injection ◽

Single Pipe

Previous studies showed the difficulty during polymer flooding and the low producing degree for the low permeability layer. To solve the problem, Daqing, the first oil company, puts forward the polymer-separate-layer-injection-technology which separates mass and pressure in a single pipe. This technology mainly increases the control range of injection pressure of fluid by using the annular de-pressure tool, and reasonably distributes the molecular weight of the polymer injected into the thin and poor layers through the shearing of the different-medium-injection-tools. This occurs, in order to take advantage of the shearing thinning property of polymer solution and avoid the energy loss caused by the turbulent flow of polymer solution due to excessive injection rate in different injection tools. Combining rheological property of polymer and local perturbation theory, a rheological model of polymer solution in different-medium-injection-tools is derived and the maximum injection velocity is determined. The ranges of polymer viscosity in different injection tools are mainly determined by the structures of the different injection tools. However, the value of polymer viscosity is mainly determined by the concentration of polymer solution. So, the relation between the molecular weight of polymer and the permeability of layers should be firstly determined, and then the structural parameter combination of the different-medium-injection-tool should be optimized. The results of the study are important for regulating polymer injection parameters in the oilfield which enhances the oil recovery with reduced the cost.

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