Beijing, March 16 (Xinhua) -- Zhang Yi learned from PetroChina on the 16th that the annual production capacity of PetroChina's largest coal and rock gas field, PetroChina Daji Gas Field, exceeded 4 billion cubic meters, accounting for more than three-quarters of the country's total coal and rock gas production, becoming an important successor resource for China's natural gas production growth.
Coal rock gas is an unconventional natural gas resource adsorbed or free in deep underground coal seams, usually buried at a depth of more than 1,500 meters, with broad prospects for exploration and development. The research results of the China Key Laboratory of Coal and Rock Gas show that China's coal and rock gas geological resources can reach 50 trillion cubic meters, of which the Ordos Basin resources exceed 25 trillion cubic meters. The national coal and rock gas demonstration zone project - Daji Gas Field is located in the southwest of Shanxi Province on the eastern edge of the Ordos Basin. Since the beginning of this year, PetroChina Coalbed Methane Company has drilled 16 new wells with a new production capacity of 250 million cubic meters, pushing the daily gas production of the gas field to exceed 11 million cubic meters, a year-on-year increase of 32%.
Compared with conventional natural gas, coal and rock gas are deeply buried, the geological conditions are complex, and the mining technology threshold is high. PetroChina Coalbed Methane Company continues to deepen the theoretical innovation of coal and rock gas exploration and development, constructs and forms a theoretical system of coal and rock gas enrichment, and accurately reveals the biphasic occurrence law of gas "adsorption-free" in deep coal and rock layers. Adhere to technological innovation as the engine, make every effort to promote the development of coal and rock gas to speed up and increase efficiency, and successfully develop a number of key core technologies to strongly support the development of scale and efficiency of coal and rock gas. In 2019, the first coal-rock gas well Daji 3-7 received industrial gas flow. In December 2021, the daily output of Jishen 6-7 well exceeded 100,000 cubic meters, becoming China's first "breakthrough well" for the efficient development of coal and rock gas. From 2023 to 2025, Daji Gas Field will achieve step-by-step rapid growth in coal and rock gas production in just 3 years, and continue to lead the development of China's coal and rock gas industry. At present, the second phase of the Daji gas field capacity construction project is being solidly promoted, and the annual production capacity of 1.5 billion cubic meters will be added after the completion of the project.