New breakthrough of shale gas fracturing technology in China
The reporter learned from China's petrochemical Fuling shale gas field, China's largest shale gas field, that in late January, as a batch of infill wells in the old construction production area of ​​the gas field obtained more than 300,000 cubic meters / day of high-yield industrial gas flow, China's shale gas New breakthroughs have been made in the development of fracturing technology.
The Fuling shale gas field is China's first large-scale commercial shale gas field. The gas production in 2018 exceeded 6 billion cubic meters, which plays an important role in ensuring the natural gas supply of the provinces and cities along the Yangtze River Economic Belt, but the gas field is also facing the production of old areas. The decline is rapid, the investment in single wells has dropped sharply, the task of ensuring natural gas supply is heavy, and the pressure is great.
To this end, the Fuling Shale Gas Field has stepped up efforts in scientific and technological research, and has opened more “new wells†among the “old wells†that have been put into production. It is most likely to increase the efficiency of resource development in the mineral rights area, and has become an inevitable choice for gas fields to stabilize production and supply.
According to the relevant person in charge of Fuling Shale Gas Company of Jianghan Oilfield of Sinopec, infill wells are the top priority for the stable production of gas fields, but it is more difficult to drill high-yield wells in old areas with high recovery and reduced available reserves. How to optimize the fracturing process has become the primary challenge.
Fuling Shale Gas Company deeply analyzes and researches the shale gas fracturing gas testing process, well access materials, organization and operation, etc., optimizes the fracturing engineering plan, adopts a new type of "multi-cluster dense cutting + pitching steering + continuous sanding" pressure The fracturing process, by increasing the number of perforated clusters in each section, greatly shortening the cluster spacing, and changing the first stage of fracturing to one stage of second stage, which has improved the complexity of underground fracture network transformation and torn the formation more "broken". Increased area of ​​overflow.
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