Invention Grant
- Patent Title: Dual rod drill pipe with improved flow path method and apparatus
- Patent Title (中): 双杆钻杆具有改进的流路方法和装置
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Application No.: US11805695Application Date: 2007-05-24
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Publication No.: US07694753B2Publication Date: 2010-04-13
- Inventor: Robin Carlson , Randy R. Runquist , Tod J. Michael , Shawn Moyer
- Applicant: Robin Carlson , Randy R. Runquist , Tod J. Michael , Shawn Moyer
- Applicant Address: US IA Pella
- Assignee: Vermeer Manufacturing Company
- Current Assignee: Vermeer Manufacturing Company
- Current Assignee Address: US IA Pella
- Agency: Merchant & Gould P.C.
- Main IPC: E21B17/18
- IPC: E21B17/18 ; E21B21/12
Abstract:
A drill rod assembly including inner and outer drill rods. The drill rod assembly further including flow passages that are in fluid communication with an annular fluid flow path defined between the inner and outer drill rods. The passages preventing blockage of a drill string fluid flow path when a number of drill rod assemblies are interconnected to form a drill string.
Public/Granted literature
- US20070272444A1 Dual rod drill pipe with improved flow path method and apparatus Public/Granted day:2007-11-29
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