Gas mixture enhance coalbed methane recovery technology: Pilot tests

Enhanced Gas Drainage from Undersaturated Coalbed Methane Reservoirs

Traditional methods of coal seam gas drainage rely on the use of reservoir pressure reduction to promote gas desorption from the coal matrix. Studies in coal mining gas drainage operations, particularly in coal seams that are deeply undersaturated and have low permeability, found the rate of reservoir pressure reduction was prohibitively slow. In such conditions, lengthy production delays have ...

Well Evaluation for Coalbed Methane

Coalbed Methane Canister Desorption Techniques

The British Columbia Geological Survey Branch and the Geological Survey of Canada have initiated ajoint project to assess the coalbed-methane potential of coal deposits in British Columbia. This project entails participation with private industry to obtain fresh coal samples for desorption from exploration projects throughout the province. Samples are collected from the drill site and undergo a...

The Composition of Coalbed Gas

TABLES ..................................................... . 1 Coalbeds sampled ........................ . . 2 Composition of gas from Pocahontas No 3 c o a l ...... . 3 . Hydrocarbons from Pocahontas No 3 c o a l ........................ . . 4 Composition of gas from P i t t sbu rgh coa l ............................ .......................... . 5 Composition of gas from Ki t tanning coalbed...

SPE 113410 Application of Coalbed Methane Water to Oil Recovery by Low Salinity Waterflooding

Development and production of coalbed methane involves the production of large volumes of water. The salinities and sodium adsorption ratios of coalbed methane (CBM) water from the Powder River Basin range from 370 to 1,940 ppm and 5.6 to 69 respectively. Surface discharge of CBM water can create serious environmental problems; subsurface injection is generally viewed as economically nonviable....