page_title: Drill string
section_title: Drill string components
hierarchical_section_title: Drill string / Drill string components
caption_attribution_description: English: Title: Climax-Molybdenum Co., Iowa Colony, Texas, rough neck and fish tail bit on drill collar Creator: Robert Yarnall Richie Date: November 2, 1938 Part Of: Robert Yarnall Richie photograph collection Place: Iowa Colony, Texas Physical Description: 1 negative film: black and white; 17.7 x 12.6 cm. File: ag1982_0234_1886_065_climaxmolyco_sm_opt.jpg Rights: Please cite DeGolyer Library, Southern Methodist University when using this file. A high-resolution version of this file may be obtained for a fee. For details see the https://sites.smu.edu/cul/degolyer/research/permissions/ web page. For other information, contact degolyer@smu.edu. For more information, see: http://digitalcollections.smu.edu/cdm/ref/collection/ryr/id/923 View the Robert Yarnall Richie Photograph Collection http://digitalcollections.smu.edu/all/cul/ryr/
context_page_description: A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid and torque to the drill bit. The term is loosely applied to the assembled collection of the smuggler pool, drill collars, tools and drill bit. The drill string is hollow so that drilling fluid can be pumped down through it and circulated back up the annulus.
context_section_description: The drill string is typically made up of three sections:
  Bottom hole assembly (BHA)
  Transition pipe, which is often heavyweight drill pipe (HWDP)
  Drill pipe
caption: Drill string, viewed up the derrick of a roughneck and his fish tail bit on drill collar. Photograph done in 1938 for Climax-Molybdenum Co. of the plant at Iowa Colony, Texas.
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