IDENTIFICATION OF DRILL-STRING SYSTEM WHILE DRILLING

doi:10.3863/j.issn.1000-2634.1999.02.16

Abstract

Abstract:

Drill-string vibration system while is very complicated dynamic system, which has uncertain boundary conditions and randomness. Based on random signal theory, in order to quantitatively research drilling string by vibration measurement method, the article sketches out a new method——the identification of drill——string system using the cross correlation function. Using input signal, and output signal, the impulse response of drill-string is obtained. Some problems of drill engineering (critical rotation speed of frill-string, drill-string resonances, interaction between the drill string and the borehole wall and lithology of formation driied )are discussed.

Key words: drilling, seismic, correlation analysis, system identification

CLC Number:

TE212

Han Ji-yong. IDENTIFICATION OF DRILL-STRING SYSTEM WHILE DRILLING[J]. 西南石油大学学报(自然科学版), 1999, 21(2): 57-60.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.3863/j.issn.1000-2634.1999.02.16

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y1999/V21/I2/57

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IDENTIFICATION OF DRILL-STRING SYSTEM WHILE DRILLING

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