Definition of terms and explanatory notes. The Official Methods of Analysis was first released in electronic format, as a companion to the print Official Methods of Analysis of AOAC INTERNATIONAL, 18th Edition, in 2005. For new and revised methods approved since 2005, see adoption/revision date for each method. These dates are located in either the header block at the top of the method for major modifications, or in a revision line at the bottom of the method for minor editorial revisions.
They are also known as unconventional because of the novel techniques â like fracking and horizontal drilling â used to extract the gas. Unlike shale gas, coalbed methane extraction doesnât always involve fracking â at least not in the early years of a development.hale gas and coalbed methane are known as 'unconventional' because unlike conventional sources which are found in larger, easier to access reservoirs, the gas is trapped in tiny little pockets in the shale rock or coal seams.
Swabbing Unit. Swabbing is a process to remove liquids from the production zone of a gas or oil well. Gas and oil wells produce fluid over the life of a well. When a well is first drilled it is usually Fracked to help open production zones. Fracking can include water. After fracking the liquids are recovered by swabbing the well. As liquids are lifted to relieve the hydrostatic weight from the producing formation the bottom-hole pressure pushes the gas and/or oil up and out of the well.