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Research Papers: Materials Technology

A Multibody Dynamic Model of Drillstring for Torque and Drag Analysis

[+] Author and Article Information
Yang Caijin

State Key Laboratory of Traction Power,
Southwest Jiaotong University,
Chengdu 610031, China;
Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China
e-mail: ycj78_2012@163.com

Cheng Zaibin

Drilling & Production Research Institute;
CNOOC Research Institute;
State Key Laboratory of Offshore Oil Exploration,
Beijing 100027, China
e-mail: chengzaibin@126.com

Jang Wei

CNOOC Engineering Technology Department,
Beijing 100010, China;
State Key Laboratory of Offshore Oil Exploration,
Beijing 100027, China
e-mail: jiangwei@cnooc.com.cn

Jiang Shiquan

Drilling & Production Research Institute;
CNOOC Research Institute,
Beijing 100027, China
e-mail: jiangshq@cnooc.com.cn

Ren Gexue

Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China
e-mail: rengx@mail.tsinghua.edu.cn

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received February 13, 2012; final manuscript received February 10, 2015; published online March 18, 2015. Editor: Solomon Yim.

J. Offshore Mech. Arct. Eng 137(3), 031403 (Jun 01, 2015) (9 pages) Paper No: OMAE-12-1016; doi: 10.1115/1.4029901 History: Received February 13, 2012; Revised February 10, 2015; Online March 18, 2015

Excessive torque and drag in the wellbore can result in the buckling and the failure of the drillstring. Accurate predicting torque and drag is important in drilling operations. Due to the nature of the drilling, determination of torque and drag is a dynamic problem. A multibody dynamic model of the drillstring for the torque and drag analysis is developed here. Unlike traditional softstring models and stiffstring models, the developed model relaxes the assumption of continuous contact between the drillstring and the wellbore. Moreover, this model can account for overall rigid motion, three-dimensional (3D) rotation and large deformation of the drillstring with large-scale slenderness ratio and random contact between the drillstring and the wellbore. The effects of local protuberant components of the drillstring, such as the drillpipe subs and the stabilizers are also incorporated in the current model, which are not considered in most of existing models. Numerical analysis with three cases is carried out to show the application of the developed model in predicting torque and drag in the wellbore.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

Schematic of the drilling system

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Fig. 3

An approximate model of the wellbore

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Fig. 4

A reduced point-to-cylinder model

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Fig. 5

The contact model of local protuberant components of the drillstring

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Fig. 6

The deviated straight well

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Fig. 7

Time histories of moving velocities of nodes 1, 21, and 41 of the drillpipe of case 1

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Fig. 8

Time histories of rotation angular velocities of the cross sections of the drillpipe at nodes 1, 21, and 41 in case 1

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Fig. 9

Drag forces for the well of case 1

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Fig. 10

Torque for the well of case 1

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Fig. 11

The horizontal well with a 90 deg bend

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Fig. 12

Time histories of moving velocities of nodes 20, 50, and 80 of the drillpipe of case 2

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Fig. 13

Time histories of tension forces on the cross sections of the drillpipe at end nodes

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Fig. 14

The build–sail type well

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Fig. 15

Drag forces for the well of case 3

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Fig. 16

Torque for the well of case 3 at t = 2 s

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