Drilling optimization searching and control method

Details Drilling optimization searching and control method Drilling optimization searching and control method

1978-06-29

1980-04-01

Leppink, James A.

Boring or penetrating the earth

Automatic control

Of advance or applied tool weight

731515, 173 9, 173 12, E21B 306

Patent

active

041956990

ABSTRACT:
A searching method for optimizing the rate of penetration of a drill into a given medium based upon the two drilling parameters of thrust and speed of revolution. Preset base values of both parameters are input into the drilling control mechanism at the start of the process. Thereafter, based upon readings from an automatic penetration rate calculator, incremental changes are automatically made to one of the parameters, the other being held constant, until a maximized rate of penetration is established. Subsequently, the other parameter, previously held constant, is changed until a new maximized penetration rate is found. This optimized penetration rate searching is continuously and automatically effected until the drilling process is completed. The method additionally provides for the allowance of a wait period between successive incremental changes for accommodating response times of the system as well as instabilities which may occur as the result of nonlinear process dynamics.

REFERENCES:
patent: 3039543 (1962-06-01), Loocke
patent: 3593807 (1971-07-01), Klima
patent: 3658138 (1972-04-01), Gosselin
patent: 3872932 (1975-03-01), Gosselin
patent: 3971449 (1976-07-01), Nylund
Kennedy-Computerdrilling System, Oil and Gas Journal, May 10, 1971, pp. 61-64.

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