Analysis on economic benefits of coalbed methane drilling technologies

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...

Permeability Variation Models for Unsaturated Coalbed Methane Reservoirs

A large number of models have been established to describe permeability variation with the depletion of reservoir pressure to date. However, no attempt has been made to draw enough attention to the difference in the effect of various factors on permeability variation in different production stages of unsaturated CoalBed Methane (CBM) reservoirs. This paper summarizes the existing and common per...

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 ...

Analysis of Slug Test Data From Hydraulically Fractured Coalbed Methane Wells

This paper presents new type curves for analyzingslug tests in hydraulically fractured coal seams. The type curves were viable producers, Therefore, these conventional slug test analysis developed using a finite-conductivity,vertical fracture model and techniques cannot be used to either assess the success of the fracturetreatmentor to evaluatethe px.t-fracture potentialof these are presented i...