Title: Hydraulic fracturing using a horizontal drilling technique – status after 1 year 
Resource Type: document --> technical publication --> report 
Country: Denmark 
Language(s): Danish
English
 
Year: 2006 
Availability: Environmental project, Miljørapport nr. 1113 
Author 1/Producer: Walsted, Lisbeth 
Other Authors/Producers: Christensen, Ander, G. 
Author / Producer Type: Agency, regulator or other governmental or inter-governmental body 
Publisher: Miljøstyrelsen 
Publisher City: Strandgade 29, DK-1405 Copenhagen K, Denmark 
ISBN: 87-7052-222-7 
Report / download web link (=direct link): http://www2.mst.dk/common/Udgivramme/Frame.asp?pg=http://www ...  
Format (e.g. PDF): PDF 
Size: (e.g. 20mb) 124 
EUGRIS Keyword(s): Contaminated land-->Remediation options-->In situ treatment technologies
 
Short description: A remediation technique called hydraulic fracturing has been initiated to evaluate whether it is cost effective in low permeable moraine clay. After one year of operation, the groundwater hydraulic pressure gradient in the moraine clay has been reversed, so that groundwater within the 'hot-spot' flows towards the horizontal drains. 
Long description: Contamination with chlorobenzene, dichlorobenzene, dichloronitrobenzene and aniline is present to a depth of 5 m´s in moraine clay. The remediation technique employs hydraulic fracturing to increase permeability in the clay allowing remedial pumping of water and soil gas from horizontal drains using a Dual Phase Extraction (DPE) technique. The fractured drain system affects a zone of up 4.5 meter each side of the drains and an overall upward gradient in relation to the primary chalk reservoir below the moraine clay has been produced protecting the groundwater reservoir. After 14 months of operation 25 kg of contaminants have been removed at an average rate of 0.08 kg/day and operations cost are approx.132 EUR per m³ water. 
Submitted By: Dr Jacqueline Falkenberg WhoDoesWhat?      Last update: 26/01/2007