Hydraulic ram pumps and Sling Pumps

Profile -- Cable Tool Drilling, 9/18/94Affiliation:Westinghouse Hanford CompanyTechnology Category:DrillingDeveloped by:This is a baseline technology.What is the need for the technology?This is a baseline technologyTechnology Objectives:What are the objectives of this technology?The objectives of this technology are to limit public and worker exposure to hazards, obtainrepresentative geologic samples, and minimize the amount of secondary waste generated. A secondaryobjective both during drilling and after the completion of a boring or well is to place instruments,sensors, and other devices underground to be used in characterization, remediation, and monitoring.Cabletool drills operate by repeatedly lifting and dropping a heavy string of drilling tools into the borehole.There are five components on a full string of cable tool drilling equipment: a drill bit or shoe, a drillstem, drilling jars, a swivel socket, and a cable. The drill bit transmits the force to the earth. The drillstem is the longest section, and it connects the bit to the drilling jars. The drilling jars are like a pair oflinks in a chain and are used to jar the drill bit free of the formation. The swivel socket connects the restof the drill tools to the cable. And the cable is strung up over a pulley on the mast to the drill motor. Adrill casing is often used in unconsolidated formations to keep the walls of the well from collapsing.To take core samples, a split-spoon sampler with a drill shoe can be added to the drill stem in place of thedrill bit. A core catcher is placed at the bottom of the sampler to keep the core from falling out before itis retrieved at the surface. After the sampler is driven into the formation by the cable tool drill, it isremoved from the hole and the sampler is split in half lengthwise to extract the core sample.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 toolhttp://www.drilshop.com/holes/cabtool.html (2 of 13) [1/13/2005 12:48:35 PM]