Influence of biogenic gas production on coalbed methane recovery index

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...

Production Forecasting of Coalbed Methane Wells Based on Type-2 Fuzzy Logic System

Coal bed methane (CBM) reservoir production is controlled by a large set of parameters: geology, tectonics, reservoir, completion and operation. Its simulation process is complicated, relative information is difficult to be obtained, so it is necessary to analyze accurately coal bed gas potential production capacity by adopting other mathematics methods in case of incomplete information. Regard...

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...