Method and a device for drilling with several tools in simultane

Details Method and a device for drilling with several tools in simultane Method and a device for drilling with several tools in simultane

1976-01-26

1978-03-21

Purser, Ernest R.

Boring or penetrating the earth

Automatic control

175 27, 173 4, 299 1, E21B 306, E21D 910

Patent

active

040797953

ABSTRACT:
A method for drilling boreholes utilizing a plurality of simultaneously operated boring tools. During a drilling operation the loading forces on the tools are measured and constantly compared with a predetermined limiting value representative of a limiting loading value and the variation of a limiting loading value with respect to time. If these limiting values are exceeded at least one working parameter of the tools is adjusted such as feed force, feed speed or track speed of the tools. Apparatus for carrying out the method is also disclosed.

REFERENCES:
patent: 3039543 (1962-06-01), Loocke
patent: 3593807 (1971-07-01), Klima
patent: 3613805 (1971-10-01), Linstad et al.
patent: 3743033 (1973-07-01), Taylor
patent: 3778106 (1973-12-01), Taylor et al.
patent: 3800277 (1974-03-01), Patton et al.
patent: 3971449 (1976-07-01), Nylund et al.

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