Continuous chain bit with downhole cycling capability

Details Continuous chain bit with downhole cycling capability Continuous chain bit with downhole cycling capability

1981-03-17

1983-07-26

Purser, Ernest R.

Boring or penetrating the earth

Tool element or continuously driven flexible or articulated...

175379, 175325, 299 83, E21B 1106

Patent

active

043948820

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.

REFERENCES:
patent: 2119661 (1938-06-01), Whalen
patent: 2134164 (1938-10-01), Holt
patent: 3978933 (1976-09-01), Olson et al.
Oil & Gas Journal-Oct. 8, 1979, pp. 188-189.
S. Varnado et al., "Development and Testing of a Downhole Replaceable Continuous Chain Drill", SPE 8437, Sep. 1979.

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