Build Sinopec Fracturing and Disposal Brands to Become the Pioneer of China's Coalbed Methane Pioneers Sinopec Zhongyuan Oilfield's special underground operations establish the corporate philosophy of building a leading domestic energy engineering company, strengthen technical research and market development for new energy sources, and summarize and improve the CBM methane practice. Based on the experience of fracturing and drainage and construction, through more than one year of special technical breakthroughs, it has successfully extended the technology of natural gas development from carbon dioxide fracturing to CBM drainage. This year, scientific experiments were carried out on carbon dioxide fracturing coalbed methane wells in Huaibei, Anhui Province and Jiaozuo, Henan Province. Both of the large-scale fracturing well tests were successful, indicating that Zhongyuan Underground became China’s first application of this technology in the CBM field. enterprise.
On February 23 this year, the first domestic operation of the first carbon dioxide fracturing coalbed methane well was completed at LG-3 well in Huaibei, Anhui Province, which caused great concern for coal companies and coalbed methane development industries. Consulting and negotiating technical cooperation. On July 10 of this year, in Jiaozuo, Henan Province, the 015 CBM production test well site in Jiaozuo, China successfully completed the construction of the second domestic well and further established the leading technical advantages of the Sinopec Zhongyuan Oilfield underground special operations in the coalbed methane extraction industry.
At the beginning of 2007, at the Operation Analysis Meeting of the Downhole Special Operations Department of the Zhongyuan Oilfield, Du Weiping, the manager of the division, carefully analyzed the current status and future development trend of the domestic CBM market, and proposed to speed up the R&D speed of key technologies for CBM exploration and rely on technological innovation to consolidate. Leading the development plan for CBM exploration in China, it has made Zhongyuan Underground a leading energy engineering company in China. This important decision unveiled the prelude to the new technology for coal seam gas cracking and drainage.
The main component of coalbed methane is methane, commonly known as “gas,†which is a self-generated, unconventional natural gas that is present in coal seams. Like conventional natural gas, it is a very clean fossil energy source. China's CBM resources are approximately 36.7 trillion cubic meters, which is equivalent to the size of oil and gas reserves. This huge reserve has so far failed to be effectively developed and utilized on a large scale. The single technology of exploration and exploitation is one of the important reasons.
How to apply the existing mature natural gas fracturing and drainage production technology, effectively grafted into the development of coalbed methane drainage and development, and improve the single well output of the coalbed methane well, has become an important issue for the Central Plains underground research. The R&D team here focuses on sandstone formations and low-permeability oil and gas reservoirs that are closest to the coal seam. Considering the low permeability of the coal body, it is easily deformed after being pressurized. It is difficult to overcome numerous construction problems such as the large amount of leakage of fracturing fluid when the original fracture of the coal seam is encountered in the fracturing work. At the same time, aiming at coal formation and chemical composition in the Huaibei, Huainan, Jiaozuo, Jincheng and other coal fields, ramming rules and reservoir characteristics, refine the main geological factors in the coalbed gas enrichment area, and the gas content and permeability of different coal seams. Coal ranks, structures, fissures and closures are carved in great numbers. Based on the fluid-solid coupling theory of low-permeability coalbed methane injection gas production, boldly try the construction technology design ideas of carbon dioxide energizing and nitrogen gas injection in natural gas fracturing. Inject carbon dioxide or nitrogen into the cracks in the coal seams to inject “vigor†into the coal seams that are basically free of formation pressure. After the highly volatile liquid carbon dioxide gasifies between coal seams, the volume rapidly expands by hundreds of times, which is favorable for the pressure-sealed coal-bed gas reservoirs to overcome the flow resistance in the low-permeability coal seams, effectively increasing the driving force for the flow of the coal-bed gas to the wellbore, and accelerating the Effective drainage of wellbore fluids. Gasification of carbon dioxide through the complex physical and chemical interactions with methane (coalbed methane), a small amount of gaseous methane in the coal seam is effectively squeezed out. Due to the high degree of adsorption of carbon dioxide, coal seams will gradually absorb carbon dioxide, and a large number of methane in the adsorbed state will be displaced out of the coal seam to the maximum extent, thereby improving the power and productivity of the gas wells and surrounding well networks, and prolonging the stable production of coal gas wells. time.
At present, the domestic coalbed methane reservoir reformation basically adopts fracturing technology of water-based fracturing fluid carrying sand. The comprehensive reservoir strengthening process with carbon dioxide injection and sand carrying with energized fracturing fluid has relatively minor damage to the coal seam, which is conducive to later drainage operations. The United States has widely applied such related technologies and achieved good results. Under the new international energy situation where the prices of crude oil and other energy resources are soaring, the successful testing of this technology has enriched the green new energy - a new way for the efficient development of coalbed methane, and provided strong technical support for the development of CBM in China.
On February 23 this year, the first domestic operation of the first carbon dioxide fracturing coalbed methane well was completed at LG-3 well in Huaibei, Anhui Province, which caused great concern for coal companies and coalbed methane development industries. Consulting and negotiating technical cooperation. On July 10 of this year, in Jiaozuo, Henan Province, the 015 CBM production test well site in Jiaozuo, China successfully completed the construction of the second domestic well and further established the leading technical advantages of the Sinopec Zhongyuan Oilfield underground special operations in the coalbed methane extraction industry.
At the beginning of 2007, at the Operation Analysis Meeting of the Downhole Special Operations Department of the Zhongyuan Oilfield, Du Weiping, the manager of the division, carefully analyzed the current status and future development trend of the domestic CBM market, and proposed to speed up the R&D speed of key technologies for CBM exploration and rely on technological innovation to consolidate. Leading the development plan for CBM exploration in China, it has made Zhongyuan Underground a leading energy engineering company in China. This important decision unveiled the prelude to the new technology for coal seam gas cracking and drainage.
The main component of coalbed methane is methane, commonly known as “gas,†which is a self-generated, unconventional natural gas that is present in coal seams. Like conventional natural gas, it is a very clean fossil energy source. China's CBM resources are approximately 36.7 trillion cubic meters, which is equivalent to the size of oil and gas reserves. This huge reserve has so far failed to be effectively developed and utilized on a large scale. The single technology of exploration and exploitation is one of the important reasons.
How to apply the existing mature natural gas fracturing and drainage production technology, effectively grafted into the development of coalbed methane drainage and development, and improve the single well output of the coalbed methane well, has become an important issue for the Central Plains underground research. The R&D team here focuses on sandstone formations and low-permeability oil and gas reservoirs that are closest to the coal seam. Considering the low permeability of the coal body, it is easily deformed after being pressurized. It is difficult to overcome numerous construction problems such as the large amount of leakage of fracturing fluid when the original fracture of the coal seam is encountered in the fracturing work. At the same time, aiming at coal formation and chemical composition in the Huaibei, Huainan, Jiaozuo, Jincheng and other coal fields, ramming rules and reservoir characteristics, refine the main geological factors in the coalbed gas enrichment area, and the gas content and permeability of different coal seams. Coal ranks, structures, fissures and closures are carved in great numbers. Based on the fluid-solid coupling theory of low-permeability coalbed methane injection gas production, boldly try the construction technology design ideas of carbon dioxide energizing and nitrogen gas injection in natural gas fracturing. Inject carbon dioxide or nitrogen into the cracks in the coal seams to inject “vigor†into the coal seams that are basically free of formation pressure. After the highly volatile liquid carbon dioxide gasifies between coal seams, the volume rapidly expands by hundreds of times, which is favorable for the pressure-sealed coal-bed gas reservoirs to overcome the flow resistance in the low-permeability coal seams, effectively increasing the driving force for the flow of the coal-bed gas to the wellbore, and accelerating the Effective drainage of wellbore fluids. Gasification of carbon dioxide through the complex physical and chemical interactions with methane (coalbed methane), a small amount of gaseous methane in the coal seam is effectively squeezed out. Due to the high degree of adsorption of carbon dioxide, coal seams will gradually absorb carbon dioxide, and a large number of methane in the adsorbed state will be displaced out of the coal seam to the maximum extent, thereby improving the power and productivity of the gas wells and surrounding well networks, and prolonging the stable production of coal gas wells. time.
At present, the domestic coalbed methane reservoir reformation basically adopts fracturing technology of water-based fracturing fluid carrying sand. The comprehensive reservoir strengthening process with carbon dioxide injection and sand carrying with energized fracturing fluid has relatively minor damage to the coal seam, which is conducive to later drainage operations. The United States has widely applied such related technologies and achieved good results. Under the new international energy situation where the prices of crude oil and other energy resources are soaring, the successful testing of this technology has enriched the green new energy - a new way for the efficient development of coalbed methane, and provided strong technical support for the development of CBM in China.
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