Development and utilization of coalbed methane around the world

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The total global reserves of coalbed methane amount to approximately 260 trillion cubic meters. Countries around the world are paying increasing attention to the exploration and utilization of coalbed methane, and there is a growing trend in its exploitation on a global scale. Many have developed unique experiences and practices in the exploration and utilization of coalbed methane, which hold certain reference value for the development of China’s coalbed methane industry. The total reserves of coalbed methane in the United States amount to 21 trillion cubic meters. The United States is the most successful country in the world in terms of the commercial development of coalbed methane, and it also has the highest production levels of this gas. Coalbed methane accounts for 10% of total natural gas production, holding a significant role in the U.S. energy industry. Before 1994, the total amount of methane emitted in the United States each year as a result of coal mining reached 4.2 billion cubic meters, which not only severely polluted the atmosphere but also resulted in huge losses of energy and funds. In the late 1970s, oil prices in the United States soared. To alleviate the supply-demand imbalance and address issues related to mining safety and air pollution, the U.S. introduced the Energy Emergency Profit Act in 1980, which encouraged the development of unconventional gas resources and low-permeability gas reservoirs. This policy played a significant role in promoting the development of coalbed methane in its early stages. The preferential policies effectively promoted the development of the U.S. coalbed methane industry, causing coalbed methane production to rise rapidly from less than 200 million cubic meters per year to 32.4 billion cubic meters by 1998, in less than 20 years. In 2004, the annual production of coalbed methane in the United States reached 50 billion cubic meters. Russia, which has the second-largest coal reserves in the world, mined 280 million tons of coal in 2002, an increase of 1.3% compared to 2003; however, as coal mining increased, large amounts of coalbed methane were also released into the atmosphere. Coalbed methane is an excellent hydrocarbon source and energy carrier; the recovered coalbed methane can be used as an energy source. If it is allowed to escape into the atmosphere, it not only leads to waste of resources but, more importantly, since the main component of coalbed methane is methane, its greenhouse effect is much greater than that of carbon dioxide. Therefore, coalfields in Russia are attempting to recover and utilize coalbed methane. It is reported that each year, 100 million to 200 million cubic meters of coalbed methane emitted from the Kuzbas coalfield are removed from the mines through extraction pipelines, and this portion of coalbed methane can be easily recovered. Russian experts believe that generating electricity from coalbed methane holds great prospects, with the resulting power being usable for coal mine operations or for external supply. In addition to power generation, coalbed methane extracted from coal mines can be used for industrial production or residential heating after coal particles and moisture are removed and its concentration is increased; it can also be used as a vehicle fuel. Russian experts believe that the utilization of coalbed methane helps to open up new directions for the development of the coal industry, create more job opportunities, and enhance its economic potential. Since burning coalbed methane produces less carbon dioxide than burning coal, using it partially to replace coal for heating and power generation will not cause a significant greenhouse effect. Therefore, in addition to improving the local ecological environment, it can also help slow down the trend of global warming. According to Russian media, Russian coal mines will place greater emphasis on the use of coalbed methane recovery technologies in order to control the country’s greenhouse gas emissions. Kreis, chairman of the French company Green Gas, said regarding the recovery of coalbed methane that for coal mining companies, generating electricity from coalbed methane is not technically difficult; the key lies in funding, or rather, in the methods of financing. There are two main reasons for dealing with coalbed methane. First, this gas is highly flammable, posing a serious threat to the safety of miners. Second, methane, which is present in coalbed methane generated during coal mining, accounts for the largest share of global greenhouse gas emissions. As countries sign the Kyoto Protocol, proper handling of coalbed methane is also of great importance from an environmental perspective. As early as two or three decades ago, European coal companies such as those in France and Germany began to extract coalbed methane. French experts in coalbed methane believe that generating electricity from coalbed methane is not technically difficult at all; only a gas extraction system and natural gas power generation equipment are required. A major reason why this approach could not be widespread around the world in the past was its high cost. In recent years, as the environmental benefits of extracting coalbed methane have become increasingly evident, financing methods have been devised to promote this practice. After the Kyoto Protocol came into effect, the \"Clean Development Mechanism\" under that protocol allowed for the trading of greenhouse gas emission reduction credits. Through this mechanism, member countries could invest in projects in developing countries in order to fulfill part of their commitments regarding greenhouse gas reductions. More specifically, once the greenhouse gas emission reductions generated by this project are verified, they will be purchased by a dedicated international fund. The organization of such funds relies on a **cooperation mechanism with the private sector**, comprising multiple countries and various private companies; this organization can authorize international bodies such as the World Bank to act as trustees, representing its participating parties in purchasing greenhouse gas emission reductions from projects. It is under this operational model that coal mining companies obtain the funds needed to continue advancing the practice of extracting coalbed methane; this not only generates electricity but also helps address safety issues and reduce greenhouse gas emissions, making it highly beneficial for such companies. Australia attaches great importance to the development and utilization of coalbed methane, and the exploration and development of this resource are progressing rapidly there, making it one of the most active regions in the world for coalbed methane development. Coalbed methane exploration in Australia began in 1976; by 2004, production amounted to about 1 billion cubic meters, and the sector had entered a phase of large-scale commercial development. In Australia, the exploration and development of coalbed methane rely mainly on underground directional wells; thanks to its well-developed gas pipeline network, production has increased rapidly, and coalbed methane production has become an important part of total natural gas production. Australia has long been at the world’s forefront in coal mine safety technology, and it possesses advanced techniques and measures for managing gas, preventing coal mine disasters, conducting geological exploration of coal fields, and providing safety training. Developing coalbed methane is a process of turning waste into treasure, enabling the integration of social, environmental, and economic benefits. Now, by recovering the gas extracted during drilling, it is possible to completely eliminate the threat of coal miners being harmed by gas explosions in mines; moreover, this gas can be reused as a new alternative energy source after processing.