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Research Papers

A Prediction Model of Casing Wear in Extended-Reach Drilling With Buckled Drillstring

[+] Author and Article Information
Leichuan Tan

MOE Key Laboratory of Petroleum Engineering &
State Key Laboratory of Petroleum
Resources and Engineering,
China University of Petroleum-Beijing,
Beijing 102249, China
e-mail: tanleichuan0220@126.com

Deli Gao

Professor
MOE Key Laboratory of Petroleum Engineering &
State Key Laboratory of Petroleum
Resources and Engineering,
China University of Petroleum-Beijing,
Beijing 102249, China
e-mail: gaodeli@cup.edu.cn

Jinhui Zhou

MOE Key Laboratory of Petroleum Engineering &
State Key Laboratory of Petroleum
Resources and Engineering,
China University of Petroleum-Beijing,
Beijing 102249, China
e-mail: ezhoujinhui@126.com

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received September 19, 2017; final manuscript received November 5, 2017; published online December 4, 2017. Editor: Yonggang Huang.

J. Appl. Mech 85(2), 021001 (Dec 04, 2017) (11 pages) Paper No: JAM-17-1525; doi: 10.1115/1.4038424 History: Received September 19, 2017; Revised November 05, 2017

Buckled drillstring easily existed in extended-reach drilling (ERD) engineering, causing casing wear more severe. However, the effect of the buckled drillstring on casing wear prediction is going unheeded in long-term studies. To solve the issue, this paper proposes a new model, named as circumferential casing wear depth (CCWD) model, based on the energy principle and the more complicated geometry relationship than that in casing wear groove depth (CWGD) model. Meanwhile, sensitivity analysis of parameters clearly describes the changing trends among them. With the established composite wear models, the change of casing wear depth versus drilling footage under different composite wear cases is also discussed. The results show that the severe casing wear may occur if there is the buckled drillstring; due to the greater contact force and more sophisticated wear shape than those under nonbuckling condition, a shorter drilling footage could make a larger calculation error when only CWGD model is used. In the case study, the method of the inversion of casing wear factor from the drilled well can be used to predict the well whose structure resembles it; the revised coefficient, the maximum risky casing wear depth can be evaluated for each wellbore section to avoid drilling engineering failure. The new model provides a practical method to improve the prediction accuracy of casing wear in ERD. Neglecting the effect of the buckled drillstring will make the prediction underestimated and a great economic loss, which is significant for ERD.

Copyright © 2018 by ASME
Topics: Wear , Drill strings
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References

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Figures

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Fig. 1

Schematic overview of the buckled drillstring existed in drilling progress

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Fig. 2

Comparison of research objects of CWGD and CCWD model

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Fig. 3

A diagram of the helical buckled drillstring existed in casing

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Fig. 4

Geometrical relationship of the worn cross section observed from the visual angle along the axis of the buckled drillstring

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Fig. 5

Geometrical relationship of the worn cross section observed from the visual angle along the axis of the wellbore

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Fig. 6

Geometrical relationship of the worn cross section observed from the visual angle along the axis of the buckled drillstring

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Fig. 7

Dimensionless CCWD versus dimensionless phase angle for different drillstring eccentricity above the critical value

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Fig. 8

Circumferential casing wear depth diagram for different drillstring eccentricity above the critical value

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Fig. 9

Dimensionless CCWD versus dimensionless phase angle for different drillstring eccentricity below the critical value

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Fig. 10

Circumferential casing wear depth diagram for different drillstring eccentricity below the critical value

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Fig. 11

Dimensionless CCWD versus dimensionless phase angle for different helix eccentricity of drillstring

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Fig. 12

Circumferential casing wear depth diagram for different helix eccentricity of drillstring above the critical value

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Fig. 13

Dimensionless CCWD versus dimensionless phase angle for different helix eccentricity of drillstring

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Fig. 14

Circumferential casing wear depth diagram for different helix eccentricity of drillstring below the critical value

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Fig. 15

Composite casing wear of CCWD + CWGD

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Fig. 16

Composite casing wear of CWGD + CCWD-A

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Fig. 17

Composite casing wear of CWGD + CCWD-B

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Fig. 18

Casing wear prediction for composite wear cases

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Fig. 19

Casing wear factor inversion for C1ERD-X7

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Fig. 20

Well structure comparison of C1ERD-X7 and C1ERD-X8

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Fig. 21

Inversion and prediction diagram

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Fig. 22

Casing wear prediction of well C1ERD-X8

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Fig. 23

Prediction of maximum risky casing wear depth for difference cases

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Fig. 24

The geometrical relations of Dcw(θ) observed from visual angle along the axis of wellbore

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