On February 22, the Φ4.2m advance drilling of the Cococap project department successfully drilled the final hole, and achieved a staged victory in the drilling project of the return air vertical well.

It is understood that the wellbore of this drilling project is designed with a net diameter of 6.0m and a depth of 513.4m. The drilling method is "one expansion into a well". The advanced drilling is Φ4.2m, the reaming is 8.5m, and the upper part is all sand layer with a thickness of 61.7m. The lower part is all rock formation with complex structure. Aiming at the special stratum of the western coal mine, the project department has scientifically planned and carefully deployed. The project team has continuously overcome the difficulties in the drilling process by reasonably controlling drilling and mud parameters, strengthening the awareness of safety responsibility, and careful operation and maintenance. full approval of the party.

This time, the Φ4.2m advanced drilling was carried out safely and smoothly into the final hole, which achieved a new breakthrough in the construction of the Western Coal Mine for the first time in the "drilling method" construction. In the next step, the project team will make persistent efforts, continue to do a good job in research and cooperation, and lay a solid foundation for the subsequent drilling of Φ8.5m reaming.