The ongoing trouble on the Cold Lake Air Weapons Range in North Eastern Alberta, where oil company Canadian Natural Resources Ltd. (CNRL) has numerous in situ oil recovery sites, has yet to show signs ofย abatement.
Underground oil spills on CNRLโs Primrose facility have been leaking bitumen emulsion into the muskeg, waterways and forest that surround the site for nearly three months.
The Alberta Energy Regulator (AER) says the total volume of bitumen emulsion recovered from four separate sites where the seepage is ongoing is now 1275.7 cubic metres, the equivalent of 8024 barrels of oil or 1.27 millionย litres.
The original volume of the spill was reported as 28 cubicย metres.
In addition, 397 cubic metres of โoily vegetationโ has been removed from one of the sites numbered 09-21, and 5096.66 metric tones of โimpacted soilsโ have been removed from the otherย three.
โClean up continues on all four sites,โ says the AER in an updated incident report releasedย yesterday.
โBitumen recovery at the source, skimming of other areas within water body and vegetation cutting continuesโ at siteย 09-21.
โBitumen recovery, soil removal, fissure exposure, surface water management and containment efforts continueโ on the three additionalย sites.
CNRL, the company responsible for the spill, released a press statementย on July 31 stating โeach location has been secured and clean-up, recovery and reclamation activities are wellย underway.โ
Last week Cara Tobin from the Alberta Energy Regulator said, โthe spill is still ongoing. There is still bitumen coming up from the groundโฆit is not under control [because] bitumen is still comingย upโฆโ
She provided no comment Wednesday, indicating a revised incident report would be published Friday, Augustย 15.
That report states โ2 beavers, 31 birds, 82 amphibians, and 31 small mammalsโ have died as a result of theย spill.
โWildlife fencing and deterrents are installed and CNRL continues to monitor all four sites for wildlife and impactedย wildlife.โ
The exact cause of the uncontrolled spill has yet to be determined. CNRL cited mechanical failures at the well as a potential cause in its press statement, although Tobin from the AER said โwe do not have the technical data or evidence to verify what that cause might be โ what the cause or causes might be. We will determine that through our investigationย process.โ
According to the revised incident report a โsubsurface investigation has been initiated and isย ongoing.โ
CNRL experienced a similar incident in 2009 on their Primrose site. According to Tobin that incident โwas the same sort of thing where pressure pushed bitumen to surface and until that pressure was naturally able to recede underground the product continued to โ very slowly โ come toย surface.โ
Multiple investigations into the cause of the 2009 underground spill were inconclusive, although the Energy Resources Conservation Board (now the AER) stated โa contributing factor in the release may have been geological weaknesses in combination with stresses induced by high-pressure steamย injection.โ
CNRL uses a process called High Pressure Cyclic Steam Stimulation (HPCSS) in the region to release bitumen from underground rock formations. The process uses extremely high-pressure steam injection to fracture the underlying reservoir to โcreate cracks and openings through which the bitumen can flow back into the steam-injector wells,โ according to the AER.
Roughly 80 percent of Albertaโs bitumen deposits will be extracted using this and other in situย methods.
Last week more than 20 groups called on the AER to conduct a public inquiry into the safety of in situย operations.
โWhile the AER has suspended and restricted steam injection operations at the CNRL Primrose operations in response to the most recent events, it is unacceptable to have long fissures in the ground that will continue to spill toxic heated bitumen to surface, and to further risk our water and groundwater resources from these activities,โ said Carolyn Campbell, Conservation Specialist with the Alberta Wildernessย Association.
โThe time has come for a broader inquiry into CSS and SAGD [steam assisted gravity drainage] steam injection operations,โ sheย said.
Image Credit: Emmaย Pullman
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