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Title: Continuous chain bit with downhole cycling capability

Abstract

A continuous chain bit for hard rock drilling is capable of downhole cycling. A drill head assembly moves axially relative to a support body while the chain on the head assembly is held in position so that the bodily movement of the chain cycles the chain to present new composite links for drilling. A pair of spring fingers on opposite sides of the chain hold the chain against movement. The chain is held in tension by a spring-biased tensioning bar. A head at the working end of the chain supports the working links. The chain is centered by a reversing pawl and piston actuated by the pressure of the drilling mud. Detent pins lock the head assembly with respect to the support body and are also operated by the drilling mud pressure. A restricted nozzle with a divergent outlet sprays drilling mud into the cavity to remove debris. Indication of the centered position of the chain is provided by noting a low pressure reading indicating proper alignment of drilling mud slots on the links with the corresponding feed branches.

Inventors:
 [1];  [1];  [1]
  1. (Albuquerque, NM)
Issue Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
OSTI Identifier:
864634
Patent Number(s):
4394882
Assignee:
United States of America as represented by United States (Washington, DC) SNL
DOE Contract Number:  
AC04-76
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
continuous; chain; bit; downhole; cycling; capability; hard; rock; drilling; capable; drill; head; assembly; moves; axially; relative; support; held; position; bodily; movement; cycles; composite; links; pair; spring; fingers; opposite; hold; tension; spring-biased; tensioning; bar; supports; centered; reversing; pawl; piston; actuated; pressure; mud; detent; pins; lock; respect; operated; restricted; nozzle; divergent; outlet; sprays; cavity; remove; debris; indication; provided; noting; reading; indicating; proper; alignment; slots; corresponding; feed; branches; proper alignment; drilling mud; head assembly; remove debris; axially relative; drill head; rock drilling; centered position; chain bit; moves axially; hard rock; rock drill; pressure reading; downhole cycling; continuous chain; /175/299/

Citation Formats

Ritter, Don F., St. Clair, Jack A., and Togami, Henry K. Continuous chain bit with downhole cycling capability. United States: N. p., 1983. Web.
Ritter, Don F., St. Clair, Jack A., & Togami, Henry K. Continuous chain bit with downhole cycling capability. United States.
Ritter, Don F., St. Clair, Jack A., and Togami, Henry K. Sat . "Continuous chain bit with downhole cycling capability". United States. https://www.osti.gov/servlets/purl/864634.
@article{osti_864634,
title = {Continuous chain bit with downhole cycling capability},
author = {Ritter, Don F. and St. Clair, Jack A. and Togami, Henry K.},
abstractNote = {A continuous chain bit for hard rock drilling is capable of downhole cycling. A drill head assembly moves axially relative to a support body while the chain on the head assembly is held in position so that the bodily movement of the chain cycles the chain to present new composite links for drilling. A pair of spring fingers on opposite sides of the chain hold the chain against movement. The chain is held in tension by a spring-biased tensioning bar. A head at the working end of the chain supports the working links. The chain is centered by a reversing pawl and piston actuated by the pressure of the drilling mud. Detent pins lock the head assembly with respect to the support body and are also operated by the drilling mud pressure. A restricted nozzle with a divergent outlet sprays drilling mud into the cavity to remove debris. Indication of the centered position of the chain is provided by noting a low pressure reading indicating proper alignment of drilling mud slots on the links with the corresponding feed branches.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {1}
}

Patent:

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