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Ultra-sonic Water Well CleaningRegenering af boringer med highpower ultralyd
VandCenter SydMads Clausen Institute, SDU
Funded by Vandsektorens Teknologiudviklingsfond (Project: 7300)
Robert Brehm, Mads Clausen Instituttet, Syddansk UniversitetPeer Locher, VandCenter Syd
Ultra-sonic Water Well CleaningRegenering af boringer med highpower ultralyd
1. Project Introduction
2. Involved Technology and Equipment
3. Experimental Setups, Models and Results
4. Improvements
5. Current Progress and Summary
Project Introduction
Project partner: VandCenter Syd, Mads Clausen Institute (SDU), InFluxFunded by: Vandsektorens TeknologiudviklingsfondTimeframe: Jan. 2012 Dec. 2012Budget: ~2.0 Million DKK
Projektpartnerne udvikler et ultralydsbaseret, miljvenligt og energieffektivt vrktj til rensning og regenerering af grundvandsboringer. Boringen bliver dermed mere effektiv og regenerering foretages i n, tidsbesparende arbejdsgang.
This work investigates the usage of high power ultra-sonic push-pull transducers to rehabilitate water wells in contrast to conservative well rehabilitation methods. We compare the effectiveness of the ultrasonic cleaning method with state-of-art conventional cleaning methods such as brushes and chemical acids. In addition the task is to study the effectiveness and level of cleaning for different filter gravel granularities and geology compounds around water wells.
Water Well AgingWells clogg over time and thereby the efficiency of the well declines.
Physical and chemical processes cause the hydraulic conductivity of the wells filter pipe and gravel pack to decline which results in a higher draw-down at the same discharge rate or with a loss in the discharge rate.
- Gravel coatings consists mainly of iron and manganese
- The pore volume fills up with fine sands and silt
- Incrustations in the formation
An aged WellBefore and after mechanical cleaning
Use of known Ultrasonic Cleaning Technology
Resonator rod induce longitudinal pulses in the resonator at the points of attachment.
Transducers inside each end cap produce cyclic positive and negative pressure waves.
The positive pressure wave acts as a pushing force and the negative pressure wave acts as a pulling force (hence "Push-pull").
The pushing and pulling action causes the rod to resonate at the frequency of operation.
As a result, near perfect, omni-directional radiation of sound waves is achieved.
Push-Pull Transducer
Micro-motion:Micro-motion as resonance causes rubbing of the filter gravel stones at each other. Coatings will be rubbed off if not completely hardened.
Oscillation:The gravel stones will start volume oscillating and coatings are spelled off.
Fluidise thixotropics:The ultrasonic energy is used to fluidise thixotropiccements, cut and break molecular lattice of gels, slime, colloidal substances
Ultrasonic Cleaning Effects
The test well (tank) cleaning setup
~50mm
~400mm
Valve (slider)
Fine mesh
Tubewith gravel
Water reservoir
Measurement of the flow rate by letting a fixed volume of water flow through a fixed volume of gravel sample. Different samples and a reference clean sample have been tested. (Darcy test)
Determination of cleaning efficiency
Proof-of-Concept Experiments Results
1 2 367,62 50,6 53,28 53,97 51,34 48,71
64,1 66,43 51,81 45,03 47,16 51,12 55,1568,18 55,19 58,57 46,6 44,29 57,69
67,47 68,91 48,66 58,81 40,87 54,03 52,2865,97 65,09 50,32 54,28 53,47 54,5 56,3566,5 69,35 51,19 55 54,28 52,18 44,6567,91 68,09 52,72 50,6 44,25 44,29 55,0970,75 59,94 50,19 56,59 43,19 50,78 54,06
Mean 67,1166667 66,70125 51,335 54,02 47,97375 50,31625 50,996875Std. 2,22489251 3,05282276 1,966250965 4,540981643 5,287394545 3,951668499 4,914188094
Flow l/min 0,89 0,90 1,17 1,11 1,25 1,19 1,18
Dirty Gravel Sieved Cleaned BOT(10cm away)
Cleaned TOP(10cm away)
Cleaned BOT(1520cm away)
Cleaned TOP(1520cm away)
CLEANREFERENCE
Recent results in water well model
Verification of results with real core samples from a polluted well inside a tank.
75cm core sample from a sonic drill borehole cleaned by the ultrasonic push-pull transducer
Time in seconds for 1liter to pass through a fixed volume of gravel.
Quantitative verification using a high range turbidity sensor andqualitative visual verification of the cleaning effect using an underwater camera.
Gravel pack
Inner well tube
Ultrasonic Probe
Camera
In-Situ testing and verification at a real well.
Turbidity and Video inspection results.
80 90 100 110 120 130
-10
-5
0
5
10
15
20
Time in minutes
relativ
e Tu
rbidity
in T
u un
its
data 1
Filter tube barrier (signal loss ~70%)
Mathematical modeling of sound propagation inside the well.
Measurement of sound propagation inside the tank model using hydrophones:
Compared to the model wave lenght maxima/minima every:
Loss reduction by improving the accoustic bridge by means of direct contact between the transducer and the filter tube. Transducer
Filter tube
Active Transducer Areas
Filter Tube
Improvements to compensate for the intensity loss
Before improvement
After improvement
Consisting of:
- Further testing to improve the sound intensity outside the filter
- New design of the ultra-sonic device
-Turbidity measurements of discharged water
-Hydrophone intensity measurement at different distances from the well
-Camera inspection during treatment
Currently ongoing
Ultralyd test ved V3E i Odense
Sonic Drill kerneboringer omkring en ldre vandvrksboring.
6 kerneboringer til 18 meters dybde.Med udtagelse af fulde kerneprver fra 4,5 til 18 m.u.t.
Kerneboring til dokumentation af tilklogning af boring
Sonic Drill Core sampling
Kerneprver fra formationen
Special thanks to:
For providing the most accurate in-situ MultiSense TuX High-Range Turbidity Sensorfor the In-Situ turbidity measurements.
For funding the project
For providing the project with purpose built specialized test equipment.
For further information or discussions please contact:
Peer Locher, tlf.: 61 63 23 71, pl@vandcenter.dk, mobil 40 80 84 62VandCenter Syd asVandvrksvej 7, 5000 Odense Cwww.vandcenter.dk
Robert Brehm MCI, Mads Clausen Instituttet, 6400 Snderborg, tlf.: 65501612, brehm@mci.sdu.dkwww.sdu.dk/mci
Or visit:
http://vtu-fonden.dk/projektzonenProject: 7300
-> http://vtu-fonden.dk/projektzonen/projekter/2011/7300.aspx
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