In-Mine Drilling

In-Mine Degasification: Target’s surface and underground directional drilling technologies can successfully degasify (remove the methane) coalbeds that are or will be mined. This degasification greatly improves the safety during mining, reduces production delays due to methane and water, and reduces costly ventilation requirements. Degasification also reduces the release of the particularly onerous greenhouse gas- methane- into the atmosphere. Depending on the reservoir properties of the coalbed, the methane can be captured, sold and utilized on site.

Adjacent Strata PDF

In-Seam Short Holes PDF

Underground PDF

Old Works Verification: Directionally drilled surface-initiated or underground boreholes of known location and trajectory can verify the location, and/or non-presence, of abandoned mines and their workings to permit safe mining by the active mine without the hazard of unexpected inundation of water or gases from the abandoned mine.

In-Seam Verification PDF

Outcrop Verification PDF

Surface Slanthole PDF

Water Drainholes: Mines often encounter nearby abandoned mines that are in the same coalbed or overlying or underlying coalbeds. Some of these mines have flooded since abandonment. Federal regulations do not permit mining under perched water- such as a flooded mine and these must be drained to permit mining. When not flooded, an underlying abandoned mine can function as an easy, economical water disposal reservoir for an active mine. Target’s directional drilling capability provides an economical and versatile means to place water drainage boreholes in advantageous locations to transport and control water flow for in-seam situations or between overlying or underlying abandoned mines. Many of these sites can be reached from outcrops. Others can be accessed from underground. The links below are some of the in mine applications.

Adjacent Coalbeds Water Drainholes PDF

In-Seam Water Drainholes PDF

Coalbed Exploration: Directionally drilled, long horizontal boreholes drilled in advance of mining can provide valuable information about the area to be mined along its length that cannot be determined by the limited sampling area of vertical boreholes. This can include geological information such as seam thickening or thinning, faults, local dips, etc… or other anomalies such as burn areas, high water or gas content areas, etc… Controlled borehole deviations (“laterals” to the sides or “sidetracks” up or down) can be drilled to further probe or define areas of interest where more information is desired or critical. Where these boreholes are used for degasification, the coalbed exploration information comes as a side benefit to the mine.

Adjacent Exploration PDF

Burn Identification PDF

In-Seam Exploration PDF

Wellhead Control: The drilling of long boreholes into the ground always carries the potential, or goal, of encountering gas and/or water at high pressures. Therefore, maintaining absolute control during and after drilling at the wellhead of the gas and or water pressures and flows is a necessary requirement to eliminate this hazard. Target’s specially designed wellhead control system has proven its unfailing ability to meet this safety need.

Wellhead Control PDF