On November 8th, the first domestic coal rock reservoir carbon dioxide dry sand fracturing construction was successfully completed in the Su 5-4-35 well, marking a new technological breakthrough in the field of deep coal rock gas exploration, development and evaluation in China, and providing important technical references for green, low-carbon and efficient development to replace energy.

The Su 5-4-35 well is located at the coal rock pressure fracturing test site in the Sulige Risk Cooperation Zone and is the first test well deployed and implemented by Chuanqing Drilling. In the preliminary work, Su 5-4-35 well has completed the preliminary evaluation of the natural productivity of deep coal and rock reservoirs through process tests such as "controllable shock wave perforation combined with efficiency enhancement" and "negative pressure perforation pumping and drainage".

In order to explore the potential application of waterless/reduced water fracturing in deep coal and rock gas development, the Sulige Project Management Department, Changqing Underground Technical Operation Company, and Drilling and Production Institute have closely cooperated and organized multiple construction plan docking seminars to revise and improve the construction plan.

On the day of the experiment, after more than two hours of intense construction, the carbon dioxide dry sand fracturing test achieved complete success. Throughout the entire sanding process, the pressure fluctuations were stable, fully demonstrating the good adaptability of carbon dioxide dry sand fracturing technology to coal and rock reservoirs. This achievement not only lays a solid foundation for Chuanqing Drilling to continue exploring, developing, and promoting this technology, but also provides new technical ideas for the domestic coal and rock gas exploration and development field.

As of now, the Su 5-4-35 well has completed post pressure soaking and is currently undergoing blowout operations. Based on the evaluation of the effectiveness of the carbon dioxide dry fracturing process, various experiments such as large-scale hydraulic fracturing, liquid profile analysis, tracer analysis, array acoustic waves, and downhole television will be conducted at the selected time in the No. 8 coal seam of the Benxi Formation to comprehensively evaluate the effectiveness of the deep coal rock gas well fracturing technology.