Object structure

Creator:

Major, Igoke E. ; Big-Alabo, Akuro ; Odi-Owei, Steven

Contributor:

Jurczak, Paweł - red.

Title:

Effect of drill string rotation on the dynamic response of drilling risers

Group publication title:

IJAME, volume 20 (2015)

Subject and Keywords:

drilling riser ; drill string ; drill string rotational speed ; free vibrations ; threshold rotational speed

Abstract:

The effect of the rotation of a drill string on the response of a drilling riser has been studied. A governing equation for the flexural response that incorporates the effect of the drill string rotation is developed from first principles, and the resulting differential equation is found to have a variable coefficient, which is a function of the drill string rotational speed. Results simulated for the free vibration response show that the drill string rotation reduces the natural frequency and increases the amplitude of vibration of the drilling riser. ; The implication of these findings is that neglecting the effect of rotation of the drill string leads to under-estimation of the deflection and over-estimation of the natural frequency. Further analysis reveals that for a drilling riser of given dimensions, a drill string rotational speed exists at which the natural frequency of the drilling riser is theoretical equal to zero, and this rotational speed is the threshold rotational speed.

Publisher:

Zielona Góra: Uniwersytet Zielonogórski

Date:

2015

Resource Type:

artykuł

Format:

application/pdf

DOI:

10.1515/ijame-2015-0034

Pages:

503-516

Source:

IJAME, volume 20, number 3 (2015)

Language:

eng

License:

CC 4.0

License CC BY-NC-ND 4.0:

click here to follow the link

Rights:

Biblioteka Uniwersytetu Zielonogórskiego