Abstract
Coalbed Methane (CBM) is a high-quality unconventional energy resource. The successful development and utilization of a CBM resource needs to consider technical feasibility and economic viability. These factors are also necessary for the improvement of production safety in coal mines, reducing carbon emission, and optimizing energy structure. Because of its unique resource characteristics, surface drilling is the prevailing development approach all over the world. Directional and horizontal wells are generally the two major well-types for CBM development. Development well-type is an important factor affecting CBM efficient development, as it is a key factor in the process of the economic and effective development of CBM resource. In this paper, a method based on Unit Technical Cost (UTC) will be constructed from the perspective of economic viability, and will be used for more simple and accurate optimization of CBM. This method is used for practical well-type optimization in two major CBM development basins in China, and the application results prove that this method is scientifically accurate and feasible.
Highlights
Annual Coalbed Methane (CBM) production was more than 60 billion cubic meters, which once accounted for about 10% of its annual natural gas production
2.1.Technical Evaluation Method decision-making of CBM drilling, completion, and stimulation in North America
The model and data shown above are utilized for calculating evaluation index (EI) under different well-types in the
Summary
Coalbed Methane (CBM)—known as coal seam gas—is formed during the process of coal formation. It is stored as gas adsorbed on the surface of coal matrix particles, and as free gas in coal pores, with methane being the main composition [1,2,3]. With constant progress of oil and gas development technologies, this formerly fatal harmful gas has become an important source of unconventional energy resources. The United States achieved the successful commercial development of CBM in the 1990s. Around 2000, Canada and Australia realized commercial development of CBM, adopting CBM development technologies from the United
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