Research Papers: Design and Analysis

A New Crescent-Shaped Wear Equation for Calculating Collapse Strength of Worn Casing Under Uniform Loading

[+] Author and Article Information
Yuanhua Lin

State Key Laboratory of Oil and Gas
Reservoir Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
e-mail: Yhlin28@163.com

Kuanhai Deng

State Key Laboratory of Oil and Gas
Reservoir Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
e-mail: dengkuanhai@163.com

Xing Qi, Dezhi Zeng, Hongjun Zhu, Dajiang Zhu

CNPC Key Laboratory for Tubular
Goods Engineering,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China

Wanying Liu

School of Material Science and Engineering,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 25, 2013; final manuscript received December 5, 2014; published online February 12, 2015. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 137(3), 031201 (Jun 01, 2015) (6 pages) Paper No: PVT-13-1071; doi: 10.1115/1.4029588 History: Received April 25, 2013; Revised December 05, 2014; Online February 12, 2015

During the practice of oil and gas drilling and exploration, the casing wear became more and more serious and well known. A crescent-shaped wear pattern is the major wear type and leads to decrease of casing collapse strength. It is obvious that the casing design and safety assessment must take casing wear into account. However, existing empirical equations generally neglect the effect of manufacturing defects on collapse strength, which leads to a large error between calculated results and experimental data. To address the need, the wear mechanism is studied in this paper, and the effects of both wear and manufacturing defects on the collapse strength are considered. Based on this study, a new equation for calculating the collapse strength of a casing with crescent-shaped wear is presented. Comparison with experiment and alternate assessment methods shows that the new equation is much better than other methods and its calculated results are much closer to the experimental data. The new equation was used for the casing design of ultra-deep wells, especially in the north–west part of China.

Copyright © 2015 by ASME
Topics: Wear , Collapse
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Grahic Jump Location
Fig. 1

Macro morphology of worn casing in wellhead

Grahic Jump Location
Fig. 2

The CBIL of deformation or failure of casing from 3496 to 3500 m

Grahic Jump Location
Fig. 3

Ovality of inner wall of casing model

Grahic Jump Location
Fig. 4

Unevenness of wall thickness of casing model

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Fig. 5

The collapse strength by different methods of wear casing

Grahic Jump Location
Fig. 6

Effect of wear type and worn depth to the collapse strength



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