Hydraulic ram pumps and Sling Pumps

Profile -- Cable Tool Drilling, 9/18/94drilling and can be used in any formation including basalt. The percussive action of the drill bit crushesthe formation. Water is used to create a slurry (an average of 10 to 20 gallons of water are added, if nowater is present in the formation). A device called a bailer removes the slurry from the hole beforedrilling continues. Samples obtained using hard tooling are low in quality because liquids are added andbecause the cuttings are pulverized; therefore, the samples are not useful for geological analysis. Inaddition, since water has flushed the sample, identifying contaminants will be difficult.The other type of cable tool drilling used at Hanford is the drive barrel technique, also called dry drilling.This method is much like pile driving in that a drill casing is driven into the soil by the cable tool rig. Thesoil goes up the inside of the casing and can be collected in a split spoon sampler or core barrel. Samplequality using this technique is far superior to that of the hard tooling method because no water is added tothe borehole.When the core barrel is removed, it can be easily contained using plastic sleeves taped over both ends.The core barrel is then knocked with a hammer so that the soil drops into the plastic sleeve. When thebarrel is empty the sleeve can be closed and placed in a drum if the soil is suspected to be contaminated.Thus public and worker exposure to contaminants is minimized.This technique does not use any fluid to soften the formation or remove drill cuttings. It is a completelydry method, which prevents the spreading of contamination and improves sample quality.The drive barrel technique is best used in relatively dry, unconsolidated soils such as the sands andgravels often found in the unsaturated zone (the soil above the water table) of the Hanford formation. AtHanford, hard tooling must be used below the water table, in areas where unsaturated zone soils becomeconsolidated, or in areas where there are large boulders.What is the technology that is currently used for this application?This is a baseline technologyProcess Description:Two types of cable tool drilling methods are used at Hanford: hard tooling or percussion drilling anddrive barrel or dry drilling. Hard tooling or percussion drilling is the most common form of cable tooldrilling and can be used in any formation including basalt. The percussive action of the drill bit crushesthe formation. Water is used to create a slurry (an average of 10 to 20 gallons of water are added, if nowater is present in the formation). A device called a bailer removes the slurry from the hole beforedrilling continues. Samples obtained using hard tooling are low in quality because liquids are added andbecause the cuttings are pulverized; therefore, the samples are not useful for geological analysis. Inaddition, since water has flushed the sample, identifying contaminants will be difficult.The other type of cable tool drilling used at Hanford is the drive barrel technique, also called dry drilling.http://www.drilshop.com/holes/cabtool.html (3 of 13) [1/13/2005 12:48:35 PM]