In--situ Testing, Operating and Troubleshooting Of ...
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InIn--situ Testing, Operating and Troubleshootingsitu Testing, Operating and TroubleshootingInIn--situ Testing, Operating and Troubleshootingsitu Testing, Operating and Troubleshooting
Of Horizontal Remediation WellsOf Horizontal Remediation Wells
Mike SequinoMike Sequino [email protected] [email protected]
Kevin Martin [email protected] Kevin Martin [email protected]
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Before the Project: Before the Project:
Remedial Feasibility TestingRemedial Feasibility Testing
• Site testing is performed utilizing vertical
monitoring wells for remedial feasibility:
• Soil Vapor Extraction, (SVE)
• Air Sparging (AS)• Air Sparging (AS)
• Total Phase Extraction (TPE)
• Biosparging
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Vertical Well Testing is Performed to Vertical Well Testing is Performed to
Determine :Determine :
• Radius of Influence (SVE and AS)
• Cone of Depression (TPE)
• Increase in Dissolved Oxygen (Biosparging)
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Results of Vertical Well TestsResults of Vertical Well Tests
• Remedial feasibility tests determine vertical well
spacing required to remediate the site.
• Indicate blower/pump/ treatment required for
operationoperation
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• Tests indicate necessity of high density network of vertical
wells for effective remediation
• Intensive network requires costly trenching, piping,
electrical, blower pump, and treatment infrastructure
• Site constraints provide an obstacle to effective remediation
Downfalls to Downfalls to
Vertical Well Feasibility TestsVertical Well Feasibility Tests
• Site constraints provide an obstacle to effective remediation
network throughout contaminant plume
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• Site Constraints
• Traditional vertical equipment could not fit in tight spacing
Why Use Horizontal Why Use Horizontal RRemediation emediation
Wells (HRWs)Wells (HRWs)
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• No Business Disruptions
• Larger ROI
• Rapid Site Closure
Why Use Horizontal Remediation Why Use Horizontal Remediation
Wells (HRWsWells (HRWs) cont. ) cont.
• Rapid Site Closure
• More Efficient
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Comparison of Costs: Comparison of Costs: HRW vs Vertical Well Network HRW vs Vertical Well Network
• Effectiveness of Treatment Area
• Accelerated Remediation Timeframes• Accelerated Remediation Timeframes
• Installation Feasibility with Site Constraints
• Reduction in infrastructure costs
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Decision to Utilize HRWs Decision to Utilize HRWs
as most cost effective optionas most cost effective option
• Based upon above listed considerations
• Consultation with the Professionals for:
– Optimal well placement
– Well screen design– Well screen design
– Constructability
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Coordination with the ProfessionalsCoordination with the Professionals
• Target zones of impact (well depth and length)
• Expected geologic profile
• Well screen design
• Review anticipated spacing of HRWs based on previous • Review anticipated spacing of HRWs based on previous
testing
• Review site constraints (utilities, buildings, property and
rights-of-way issues).
• Consideration of Ground Conditions
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So now your HRWs are successfully So now your HRWs are successfully
installed: What's next?installed: What's next?
• Proper well development
– Remove/breakdown drilling fluids
– Formation restoration
• In-Situ, As Built Testing• In-Situ, As Built Testing
– Determines actual pressure and flow rate capabilities of each well
(SVE and AS)
– Determine increased DO dispersion of Biosparge wells
– Trough of influence for TPE wells
– Other influence of chemox/thermox technologies
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Review of inReview of in--situ/assitu/as--built testing databuilt testing data
• Results of testing data utilized to design and specify
optimal remediation equipment sizes
• Eliminates speculative equipment specification based on
vertical well data
• Provides design data for cost effective waste stream • Provides design data for cost effective waste stream
treatment options if applicable
• Indicates possibility of manipulating
flow/pressure/vacuum as desired by the environmental
professional
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Troubleshooting existing HRWsTroubleshooting existing HRWs
• HRWs can be developed during their functional lifespan.
• Development removes:
• Biologic fouling
• Mineral fouling
• Formational abnormalities due to over pressurization or over pumping• Formational abnormalities due to over pressurization or over pumping
• Siltation
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Necessity of well development Necessity of well development
• Indicated by changes in site data over time
– Vacuum
– Pressure
– D.O.
– Fluid flow rate
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Necessity of HRW development cont.Necessity of HRW development cont.
• Typically formation dependent
– Some formations are more susceptible to fouling
• Biologic (presence of fertilizers or bacteria in groundwater)
• Mineralization (high Iron/Manganese) oxidation
• Siltation due to presence of fines in the treatment zone• Siltation due to presence of fines in the treatment zone
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Methods of HRW DevelopmentMethods of HRW Development
• Gentle pressurized flushing throughout the screened
section of the well utilizing proprietary, environmentally
safe chemicals and nozzle array
• Total extraction of fluids throughout the screened section • Total extraction of fluids throughout the screened section
in a thorough, stepwise manner.
– Determined by inspection of fluids generated during the process
– Should be performed by experienced personnel
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FollowFollow--up Testingup Testing
• Recommended to determine increase in effectiveness of development
techniques
• Effectiveness of development process determines future well
development schedule to maintain optimum HRW operation
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Founded in 1992, Directional Technologies, Inc. has installed over 1,000 horizontal
Horizontal Remediation Wells for Horizontal Remediation Wells for
Improved Site Cleanup Training WorkshopImproved Site Cleanup Training Workshop
www.directionaltech.comwww.directionaltech.com
Mike Sequino [email protected] 203-294-9200
Founded in 1992, Directional Technologies, Inc. has installed over 1,000 horizontal
remediation wells throughout the world.
Corporate Headquarters in Wallingford, CT
Branches offices in Philadelphia, PA; Ashby, MA; Atlanta, GA; Destin, FL