Integrated assessment of CO2-ECBM potential in Jharia Coalfield, India

Abstract

Coalbed methane (CBM) production is effectively achieved by utilizing two processes, viz. primary and secondary recovery. In this paper, the primary recovery of CBM was studied using the adsorption isotherm while CO2-ECBM process for the secondary recovery was simulated with realistic parameters. The adsorption isotherm for CH4 was drawn up to the pressure of 1200 psi for four coal samples and Langmuir isotherm curves for both CH4 and CO2 was measured for one sample up to 2000 psi. The adsorption isotherm of four samples was further utilized for finding the primary recovery factor of methane, showing that the average primary recovery is ~ 54% with the highest recovery factor of ~ 76% for one sample. Hence, CO2-ECBM process could be further implemented to enhance gas recovery. Then, a 3D heterogeneous coalbed model at a depth of 3219 ft was constructed using the COMET3 simulator to demonstrate the potential of CO2-ECBM recovery technique. A concept of break-even time was introduced in this study for the comprehension of CO2-ECBM process. It is found that coalbed reservoirs may opt to implement this technology with economically sound recovery.

Cryogenic fracturing using liquid nitrogen on granite at elevated temperatures: a case study for enhanced geothermal systems in Kazakhstan

“…The energy transition from fossil fuels to environmentally more friendly energy resources is paramount to today’s civilization 1 – 3 . The main objective is advancing and implementing renewable energy resources 4 – 6 . Geothermal energy, with low carbon emission and abundant resources, is one of the energy transition pillars 7 – 10 .…”

Environmentally Sustainable Large-Scale CO2 Sequestration through Hydrates in Offshore Basins: Ab Initio Comprehensive Analysis of Subsea Parameters and Economic Perspective

“…On the contrary, the low permeability coal challenges the CO 2 sequestration and methane recuperation process. Thus, the deep bed CO 2 -enhanced coal bed methane (CO 2 -ECBM) production process is not always commercially viable at larger scales, albeit several small-scale units of CO 2 -ECBM are orchestrated across the globe. − Despite several advantages over other known methods, geological carbon storage is not always a viable option in all of the coal and oil and natural gas fields. The cost of purchasing, transportation and storage of CO 2 makes this process commercially difficult.…”

Study on the Response Law of Coal Pore Structure and Permeability Affected by Acidification Time

“…The coal seam gas (coalbed methane) emitted in the process of coal mining will not only threaten the safety of mine production and cause casualties but also destroy the ozone layer and cause serious greenhouse emissions. − Studies show that methane can cause damage to the ozone layer 7 times as much as carbon dioxide, and the induced greenhouse effect is 20 times as much as that of carbon dioxide at the same quality. − In recent years, with the rapid development of the national economy, the depth and intensity of coal mining have been increasing, and the mine gas emission is also increasing rapidly. − At the same time, coalbed methane is also a kind of clean energy, and the proven reserves in China are as high as 12 trillion m 3 , which has great potential for development. − Coalbed methane development and effective gas extraction can not only reduce gas emissions and gas accidents but also improve the atmospheric environment . Due to the low permeability of most coal seams in our country, the effective extraction range of coal seams is small, the gas concentration is low, the extraction is difficult, and the treatment effect is not ideal. − In order to solve this engineering problem, a variety of measures have been taken to increase the permeability of coal seams, such as hydraulic punching, hydraulic fracturing, deep-hole presplitting carbon dioxide phase transformation cracking, etc. − In addition, coal surface modification technology has also been widely used in coal seam infiltration. − After acid infiltration, this technology changes the pore structure and surface properties of coal, so that the porosity and permeability of the coal seam are increased and the permeability of the coal seam is greatly improved. A multicomponent acid solution treatment of different ranks of coal was carried out by Zepeng et al It was found that the coal sample had a good antireflective effect after acidizing treatment, and the best formula of the acid solution was selected.…”