Well integrity report on East Pavillion water contamination now posted
(Pavillion, Wyo.) – The East Pavillion well integrity review report has now been posted on the website of the Wyoming Oil and Gas Conservation Commission.
According to the introduction of the paper, the report “is a technical and regulatory analysis relating to the integrity of all identified oil and gas wells within one quarter mile of 14 domestic water wells identified by the Wyoming Department of Environmental Quality as having quality and palatability issues in the vicinity of the Pavillion Gas Field…”
The draft report is now out for public comment, and comment from Encana Oil and Gas. The report was originally planned for release to Encana and its experts only, with the revised document to be released to the public. An outcry of opposition to that plan resulted in the draft document being released to both the stakeholders, the public and the energy development firm at the same time. The comment period will end on September 6, 2014
The report can be viewed on the Wyoming Oil and Gas Conservation Commissions website by clicking on the Pavillion Working Group icon. The website link is here.
“The report addresses the adequacy of drilling and completion techniques relating to gas well construction and operation, and the likelihood of fluid migration via these wellbores from deep known natural gas producing sands to shallower sands accessed by landowners for domestic water in the vicinity of the producing wells,” according to the introduction.
“The report is part of an effort by the State of Wyoming to determine if gas and other constituents observed in domestic water wells are naturally occurring or a result of gas field development. Formation natural gas and fluids can migrate out of the containing reservoirs due to geologic conditions (natural formation fractures, faulting, lack of impermeable sealing containment strata, interconnected sand bodies), wellbore pathways (casing leaks, inadequate cement or hydraulic barrier behind the surface or production casing), or induced pathways resulting from hydraulic fracture stimulation or other drilling and completion events (improper mud weight, cementing technique),” it said.