In underground coal mining, gas drainage boreholes play an important role in reducing methane concentration, improving mine safety and supporting efficient mining operations. However, the effectiveness of gas drainage depends not only on drilling quality, but also on the sealing performance of the borehole.
A borehole grouting packer is commonly used to seal the borehole section and inject grout or sealing materials into the surrounding cracks, coal seams or rock formations. Choosing the right packer can help improve sealing reliability, reduce air leakage and increase gas drainage efficiency.
This article explains the key factors to consider when selecting a borehole grouting packer for coal mine gas drainage and underground grouting applications.
1. Confirm the Borehole Diameter
The first factor to consider is the borehole diameter. A packer must match the actual borehole size to achieve effective expansion and sealing.
If the packer is too small, it may not press tightly against the borehole wall. This can cause air leakage or grout leakage during injection. If the packer is too large, it may be difficult to insert into the borehole, especially when the borehole is not straight or the wall is rough.
Before selecting a packer, customers should provide the following information:
· Borehole diameter
· Borehole depth
· Borehole angle
· Whether the borehole wall is smooth or fractured
· Whether the borehole is dry
