GeoCore: Kansas Drilling Firm.  Environmental, Geotechnical, Exploratory, and Water Supply Drilling.

Cable Tool Drilling

GeoCore maintains a full fleet of equipment designed to allow us the capability to perform a wide variety of tasks.  One of our specialized areas is cable tool drilling.  There are two types of cable tool drilling: drive barrel and percussion paddle bit.  

Drive Barrel Method

GeoCore is one of only a few private companies in the Midwest who offer drive barrel drilling.  The drive barrel method of cable tool drilling offers the advantage of less fluid and solid waste handling and more efficient development.  The drive barrel technique is performed much like a standard penetration test--but on a much larger scale.  A drill casing is driven into the soil by the cable tool rig. The soil goes into the casing and is easily collected from the drive barrel. By it's nature, the drive barrel method is a continuous sampling method of drilling.  This method significantly reduces a project's waste handling costs because it can use the minimum allowed diameter, reducing soil waste, and does not require the addition of fluid to remove drill cuttings, reducing fluid waste. As a result, development water is significantly reduced.  

The drive barrel method is commonly used for the installation of Soil Vapor Extraction (SVE) wells.  Engineers have discovered improved results using the drive barrel method over other drilling techniques. The drive barrel method “shears” or “slices” the strata; thus, it does not leave smeared soils or a filter cake on the borehole wall like auguring and fluid rotary drilling can.  In addition, the driving action tends to “open” the formation and allows for enhanced air movement.

The drive barrel technique is most often used in relatively dry, unconsolidated soils such as clays, silts, sands and gravels often found in the unsaturated zone.  However, using a combination of driving casing and the drive barrel drilling is performed below the water table in unconsolidated soil and/or sand environments.  This also reduces waste handling costs, and well development is made easier and more cost effective than other drilling methods.

Paddle Bit and Bailer Method

Paddle bit drilling is the most familiar form of cable tool drilling and can be used in any formation but is typically reserved for rock drilling. The percussive action of the drill bit crushes the formation. Water is added prior to each drilling run to create a slurry during drilling. The drill bit is removed from the hole and a bailer removes the slurry from the hole before drilling continues.  The paddle bit and bailer method is a proven drilling technique to penetrating hard, consolidated strata like limestone, sandstone, and shale.  However, samples obtained using percussion drilling are lower quality because the cuttings are pulverized and mixed other cuttings in the particular drilling interval.  Therefore, the samples pose limited usefulness for geological and chemical analysis.



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