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Drilling jar for use in a downhole network

United States Patent

January 31, 2006
View the Complete Patent at the US Patent & Trademark Office
Apparatus and methods for integrating transmission cable into the body of selected downhole tools, such as drilling jars, having variable or changing lengths. A wired downhole-drilling tool is disclosed in one embodiment of the invention as including a housing and a mandrel insertable into the housing. A coiled cable is enclosed within the housing and has a first end connected to the housing and a second end connected to the mandrel. The coiled cable is configured to stretch and shorten in accordance with axial movement between the housing and the mandrel. A clamp is used to fix the coiled cable with respect to the housing, the mandrel, or both, to accommodate a change of tension in the coiled cable.
Hall; David R. (Provo, UT), Fox; Joe (Spanish Fork, UT), McPherson; James (Sandy, UT), Pixton; David S. (Lehi, UT), Briscoe; Michael (Lehi, UT)
IntelliServ, Inc. (Provo, UT)
10/ 653,604
September 2, 2003
This invention was made with government support under Contract No. DE-FC26-01NT41229 awarded by the U.S. Department of Energy. The government has certain rights in the invention.