Boots – shoes – and leggings
Patent
1981-02-18
1983-09-27
Ruggiero, Joseph F.
Boots, shoes, and leggings
175 24, 364149, 173 6, G06F 1546
Patent
active
044070179
ABSTRACT:
A method for controlling drilling process based on the use of an adaptive model of drilling process comprises two control modes of which one is a multicycle rock formation trial mode and the other mode is a drilling mode proper. During the first cycle of the trial mode the drilling speed is determined on the basis of pre-set values of controlled parameters and approximate values of coefficients of the adaptive model being corrected and this drilling speed is compared to the value of drilling speed as measured during the first cycle; and corrected values of a respective coefficient of the adaptive model being corrected are formed based on the comparison results; and, taking into account these values, the values of control signals close to optimum values are determined which are the settings for acting on the bit during the next trial mode cycle. In each next cycle the corrected coefficients of the preceding cycle are used for determining control signals. If the measured drilling speed coincides with the computed drilling speed in two consecutive cycles, the control signal formed during these cycles is the signal to be used in the drilling mode proper. Also disclosed is an apparatus for effecting the above-described method, which includes a control board, actuating mechanisms of a drilling rig, pick-ups for sensing drilling speed, bit load and bit rotary speed, and an electronic computer storing the adaptive model of drilling process.
REFERENCES:
patent: 3752966 (1973-08-01), Foy, Jr. et al.
patent: 3971449 (1976-07-01), Nylund et al.
patent: 4165789 (1979-08-01), Rogers
A. A. Pogarsky, Automation of Deep Well Drilling Process, Nedra Publ., 1972.
Data Monitoring on Today's Rig, The Oil and Gas Journal, 9/24/73. Well-site Analysis Headed for Economy, New Capabilities, The Oil and Gas Journal, Sep. 24, 1973.
Computerized Drilling Control, Journal of Petroleum Technology 4/69.
Motsokhein Boris I.
Parfenov Boris M.
Zhilikov Valentin V.
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