Research Papers

Casing Wear Prediction Model Based on Casing Ellipticity in Oil & Gas Well-Drilling With Complex Structures

[+] 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

Academician of CAS (CHN) & 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

1Corresponding authors.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received March 28, 2018; final manuscript received May 21, 2018; published online July 2, 2018. Editor: Yonggang Huang.

J. Appl. Mech 85(10), 101005 (Jul 02, 2018) (16 pages) Paper No: JAM-18-1179; doi: 10.1115/1.4040406 History: Received March 28, 2018; Revised May 21, 2018

Any casing with perfect integrity within a complex oil and gas development scenario is subject to formation extrusion resulting in ellipticity. This paper proposes a novel casing wear prediction model, which encompasses ellipticity, geometric structural relationships, and the energy dissipation law at work in the casing. Composite structural wear models are also utilized to determine the influence of different drill pipe combinations on casing wear predictions. The casing wear position is predicted based on casing ellipticity. The proposed model yields more accurate casing wear predictions than previous models which do not properly account for casing ellipticity; to this effect, it may more effectively minimize the cost of drilling engineering and safeguard against accidents. The proposed method also outperformed other methods in a case study on a shale gas development project in Fuling, China. The inversion method is applicable to wells with similar structure to the drilled well, where casing wear position can be evaluated very accurately according to caliper logging system measurements. The proposed method facilitates sound decision-making while guaranteeing secure and reliable oil and gas well-drilling with complex structures.

Copyright © 2018 by ASME
Topics: Wear , Drilling
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Fig. 1

Three types of casing wear with ellipticity

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Fig. 4

Worn casing with ellipticity (complicated model)—Stage 1(a)

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Fig. 5

Worn casing with ellipticity (complicated model)—Stage 1(b)

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Fig. 3

Casing wear prediction with ellipticity (single groove model)

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Fig. 2

Worn casing with ellipticity (single groove model)

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Fig. 6

Worn casing with ellipticity (complicated model)Stage 2

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Fig. 14

Contrast diagram of JY-Z11 casing wear factor inversion by different prediction models

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Fig. 15

Comparison of well structure between JY-Z11 and JY-Z12

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Fig. 16

Casing wear prediction comparison for JY-Z12 by different models

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Fig. 17

Casing wear position prediction for JY-Z12

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Fig. 13

Casing wear position based on casing ellipticity

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Fig. 7

Maximum worn casing depth prediction versus drilling footage with varying casing ellipticity

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Fig. 8

Sharp-increase wear model

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Fig. 9

Blunt-increase wear model A

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Fig. 10

Blunt-increase wear model B

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Fig. 11

Blunt-increase wear model C

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Fig. 12

Composite structural wear affects casing wear prediction

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Fig. 19

Worn casing without ellipticity

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Fig. 18

Casing wear problem

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Fig. 20

Change regulation betweenαcand casing ellipticity with diverseΛ

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Fig. 21

Arbitrary location of worn casing with ellipticity (complicated model)



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