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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition Big Cat Energy Corporation: Aquifer Recharge Injection Device (ARID) The aquifer recharge injection device (ARID) is a separation technology that allows for the production of natural gas from a coal seam without producing any water at the surface. In this system the producing well is also able to function as the disposal well for produced water. ARID consists of an aluminum mandrel that is installed between a producing coal seam and a stratigraphically higher saline aquifer. The cylindrical mandrel has several rubber o-rings that are used to seal the mandrel, like a plug in the borehole. The mandrel has four machined ports; these four ports are used for water and gas conveyance, a pump cable, and a transducer. A submerged pump is attached to the bottom of the mandrel with a pipe. Water is pumped from the bottom of the borehole the top of the mandrel plug. Water is then allowed to fill up the top of the plug and seep into a previously identified saline aquifer through perforations in the well casing. A watertight seal at the wellhead ensures that all of the water pumped from the producing zone is forced into the discharge aquifer. During pumping CBM gas accumulates in the headspace created between the mandrel and water level of the coal seam. This gas is recovered through the mandrel with a pipe that leads to a surface compression station. A schematic drawing of ARID is provided in Figure 50. Figure 50. Operational diagram of the ARID process (Source: [176]). The ARID system is being marketed for the Powder River Basin. Big Cat Energy Corp. claims that it will circumvent many of the NPDES regulations that make it difficult to produce out of the Montana portion of the basin. There are no published or verifiable reports on this process; however, the device is expected to undergo field trials in 2009 [177]. Beyond the Powder River Basin, this simple technology may be employed as a cost effective solution for management and disposal of very high TDS water (Bin 5). The limiting criterion is the presence of a stratigraphically higher aquifer that has similar natural water chemistry to that of the CBM produced water and the necessary assimilative hydraulic capacity. Trivial technical literature combined with the absence of field trial data makes it difficult to discuss the broader merits and disadvantages of this technology. Back to the list of technologies 140PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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