Thermal Technologies > SEE  

Thermal Technologies





Think Thermal



Steam Enhanced Extraction

TerraTherm offers Steam Enhanced Extraction (SEE), a highly effective technology used for the recovery of free product and the remediation of volatile organic compounds (VOCs) since the mid-1990s.

SEE achieves on-site separation and treatment through steam injection into wells and extraction of hot fluids. Steam propagation is a stable and predictable process, governed by heat transfer to the formation and has been studied intensively and utilized for oil recovery and remediation of a wide range of contaminants.

TerraTherm Steam Enhanced Extraction (SEE)
Click to enlarge

TerraTherm uses SEE at low and moderate temperatures. TerraTherm installs injection and extraction wells that are used to inject steam into the subsurface while simultaneously extracting steam, vapors, mobile non-aqueous phase liquid (NAPL) , and groundwater. The injected steam is used to heat the subsurface to target treatment temperatures, typically the boiling point of the contaminant of concern at the site.

SEE utilizes the following contaminant removal and destruction mechanisms:

  • Displacement as a NAPL phase and extraction with the pumped groundwater
  • Vaporization in the steam zone
  • Accelerated vaporization and extraction in the vapor phase through pulsed pressurization and depressurization cycles
  • Dissolution, destruction, and removal with the extracted water

Sites with Significant Groundwater Flow

SEE is a logical choice for large and deep sites with significant groundwater flow. The SEE technology allows for high net extraction of fluids and displaces large amounts of groundwater towards the extraction wells. As a result, less water has to be heated to allow the formation to reach target temperatures. In addition, this displacement facilitates hydraulic control of NAPL mobility. The steam sweep through the formation and the accompanying pressure gradient displace the mobile NAPL and vaporized components as an oil front, which is recovered when it reaches the extraction wells.

Pressure Cycling for Improved
Contaminant Removal Rates

TerraTherm In Situ Thermal Remediation: Lower, Moderate and Higher Temperature Applications
Click to enlarge

Another significant benefit of SEE is the ability to conduct pressure cycling to improve contaminant removal rates. After the target zone has been heated and the majority of the NAPL extracted as a liquid, pressure cycling is induced by varying the injection pressure and the applied vacuum. This process has been shown to achieve very low concentrations in the original source zone.

TerraTherm Steam Enhanced Extraction (SEE)

Click to enlarge



Phone + 1 978 730 1200

©2015 TerraTherm, Inc. All Rights Reserved.      Privacy Policy      Contact Information