Velocity Profiling of polymer/aqueous phase interface in
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Velocity Profiling of polymer/aqueous phase interface microchannel using single molecule imaging system Xiaoliang Cheng 1 , Qihua Wu 1 , Baojun Bai 2 , Yinfa Ma 1 1 Environmental Research Centre and Chemistry department at Missouri University of S&T, Rolla, M 2 Department of Geological sciences and Engineering at Missouri University of S&T, Rolla, MO Introduction Methods, Results and Discussion The retention of the injected fluids and the specially designed additives, such as friction reducers, viscosity modifiers was considered as the major cause for productivity impairment in gas wells during drilling, completion and fracturing operation. It requires a better understanding of introduced fluid flow behavior in tight gas and shale formations for gas development to select proper fluids and associated additives that have no damage to the formation. Thus, It is increasingly important to study the flow behavior of interface between polymer and aqueous phase in the microchannel which is a experimental model for porous media. A novel single molecule dynamic imaging system has been developed. This dynamic imaging system can allow us to follow many fluorescent molecules at the same time in a micro-channel or nanochannel to study their flow behavior and flow velocity. This work investigated the introduced fluid flow behavior by studying the velocity profile of polymer and aqueous phase interface in the microchannel using single-molecule imaging system combined with microfluidic devices. Specifically, the flow rate profile of polymer and aqueous phase in micro-channels were examined. 1. Single Molecule Imaging System. Laser Prism M irror Pinhole1 Pinhole2 M irror 488 nm band-pass filter Shutter M icroscope and Sam ple IC C D C am era 488 notch filter Em ission cutoff filter In order to study the local behaviors of polymer and interactions between polymer and solid/liquid interface in micro-environmental, a specific in-house built single molecule imaging system with capillary as sample channel was designed and set up. Necessary adjustments on the setup and optical pathway optimization were conducted to generate the best signal/noise ratio. Quantitative analysis method was setup to calculate the position, size and flow rate of boundary and gas bubbles in micro-channel. Conclusions 2. Quantitative analysis method. Quantitative information on boundary shape, migration behavior and velocity profile can be directly obtained from the images. With an in-house computer program, the coordinators of each pixel and interval time between frames can be obtained. 3. Gas bubble in polymer solution. 250µm channel 50µm channel 10µm channel Polymer in H2O Gas bubble in H2O 0 10 20 30 40 50 0 25 50 75 100 125 R adialposition/ m % o f m ax 0 10 20 30 40 50 0 25 50 75 100 125 R adialposition/ m % o f m ax 0 10 20 30 40 50 0 25 50 75 100 125 R adialposition/ m % o f m ax 0 10 20 30 40 50 0 25 50 75 100 125 R adialposition/ m % o f m ax 0 10 20 30 40 50 0 25 50 75 100 125 R adialposition/ m % o f m ax 0 10 20 30 40 50 0 25 50 75 100 125 R adialposition/ m % o f m ax 0 10 20 30 40 50 0 25 50 75 100 125 R adialposition/ m % o f m ax 0 10 20 30 40 50 0 25 50 75 100 125 R adialposition/ m % o f m ax 4. Interface between polymer and aqueous solution. Setup for high-viscosity fluid Setup for low-viscosity fluid uthors thank the Financial support from Research Partnership to Secure Energy for America and Missouri S
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Velocity Profiling of polymer/aqueous phase interface in microchannel using single molecule imaging system Xiaoliang Cheng 1 , Qihua Wu 1 , Baojun Bai 2 , Yinfa Ma 1 1 Environmental Research Centre and Chemistry department at Missouri University of S&T, Rolla, MO 65401 - PowerPoint PPT Presentation
Transcript of Velocity Profiling of polymer/aqueous phase interface in
Velocity Profiling of polymer/aqueous phase interface in microchannel using single molecule imaging system
Xiaoliang Cheng1, Qihua Wu1, Baojun Bai2, Yinfa Ma1
1Environmental Research Centre and Chemistry department at Missouri University of S&T, Rolla, MO 65401 2Department of Geological sciences and Engineering at Missouri University of S&T, Rolla, MO 65401
Introduction
Methods, Results and Discussion
The retention of the injected fluids and the specially designed additives, such as friction reducers, viscosity modifiers was considered as the major cause for productivity impairment in gas wells during drilling, completion and fracturing operation. It requires a better understanding of introduced fluid flow behavior in tight gas and shale formations for gas development to select proper fluids and associated additives that have no damage to the formation. Thus, It is increasingly important to study the flow behavior of interface between polymer and aqueous phase in the microchannel which is a experimental model for porous media. A novel single molecule dynamic imaging system has been developed. This dynamic imaging system can allow us to follow many fluorescent molecules at the same time in a micro-channel or nanochannel to study their flow behavior and flow velocity. This work investigated the introduced fluid flow behavior by studying the velocity profile of polymer and aqueous phase interface in the microchannel using single-molecule imaging system combined with microfluidic devices. Specifically, the flow rate profile of polymer and aqueous phase in micro-channels were examined.
1. Single Molecule Imaging System.
Laser
Prism
Mirror
Pinhole 1 Pinhole 2
Mirror
488 nm band-pass
filterShutter
Microscope and Sample
ICCD Camera
488 notch filter
Emission cutoff filter
In order to study the local behaviors of polymer and interactions between polymer and solid/liquid interface in micro-environmental, a specific in-house built single molecule imaging system with capillary as sample channel was designed and set up. Necessary adjustments on the setup and optical pathway optimization were conducted to generate the best signal/noise ratio. Quantitative analysis method was setup to calculate the position, size and flow rate of boundary and gas bubbles in micro-channel.
Conclusions
2. Quantitative analysis method.
Quantitative information on boundary shape, migration behavior and velocity profile can be directly obtained from the images. With an in-house computer program, the coordinators of each pixel and interval time between frames can be obtained.
3. Gas bubble in polymer solution.
250µm channel
50µm channel
10µm channel
Polymer in H2O Gas bubble in H2O
0 10 20 30 40 500
25
50
75
100
125
Radial position/m
% o
f m
ax
0 10 20 30 40 500
25
50
75
100
125
Radial position/m
% o
f m
ax
0 10 20 30 40 500
25
50
75
100
125
Radial position/m
% o
f m
ax
0 10 20 30 40 500
25
50
75
100
125
Radial position/m
% o
f m
ax
0 10 20 30 40 500
25
50
75
100
125
Radial position/m
% o
f m
ax
0 10 20 30 40 500
25
50
75
100
125
Radial position/m
% o
f m
ax
0 10 20 30 40 500
25
50
75
100
125
Radial position/m
% o
f m
ax
0 10 20 30 40 500
25
50
75
100
125
Radial position/m
% o
f m
ax
4. Interface between polymer and aqueous solution.
Setup for high-viscosity fluid
Setup for low-viscosity fluid
Authors thank the Financial support from Research Partnership to Secure Energy for America and Missouri S&T
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