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Research Papers: Design and Analysis

Experimental Study on Failure Mechanism of Casing Under the Synergy of Temperature and Internal Pressure

[+] Author and Article Information
Kuanhai Deng

State Key Laboratory of Oil and Gas
Reservoir Geology and Exploitation,
Southwest Petroleum University,
Chengdu 610500, Sichuan, China;
CNPC Key Lab for Tubular Goods Engineering,
Southwest Petroleum University,
Chengdu 610500, Sichuan, China
e-mail: dengkuanhai@163.com

Yuanhua Lin

State Key Laboratory of Oil and Gas
Reservoir Geology and Exploitation,
Southwest Petroleum University,
Chengdu 610500, Sichuan, China

Wanying Liu

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

Dezhi Zeng, Jiping Yuan

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

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 24, 2016; final manuscript received August 12, 2017; published online September 26, 2017. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 139(6), 061204 (Sep 26, 2017) (6 pages) Paper No: PVT-16-1150; doi: 10.1115/1.4037634 History: Received August 24, 2016; Revised August 12, 2017

In recent years, the gas wells with high pressure, high temperature, and high H2S are increasing gradually, but the burst of casing and tubing in these wells will cause the gas channeling and overflow, and the gas with H2S flows up to surface, which causes huge damage. Although the API 5C3 and ISO 10400 standards have presented the prediction model of minimum internal pressure yield strength (IPYS) and burst strength for the casing and tubing in the process of strength design, the effect of temperature on the internal pressure strength is not considered completely. It is well known that it is extremely important to understand the failure mechanism of casing and tubing under the synergy of temperature and internal pressure. Hence, the full-scale internal pressure test is performed for N80 casing under temperature and internal pressure by adopting self-developed experimental equipment, by which the important mechanical parameters (such as minimum IPYS, burst strength, stress-hardening rate, and so on) of casing before and after hardening have been obtained. The impacts of temperature on the internal pressure strength are analyzed based on the comparison of test values with theoretical values given by API 5C3 and ISO 10400 standards. Finally, the failure mechanism and hardening characteristic of N80 casing have been clarified under the synergy of temperature and internal pressure. Research results can provide important references for internal pressure strength design of casing in deep well with high temperature.

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Figures

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Fig. 1

(a) Special holding tool experimental equipment and (b) experimental equipment of casing under the synergy of temperature and internal pressure

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Fig. 2

Relationship between IP and strain in the first LP

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Fig. 3

Relationship between IP and strain in the second LP

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Fig. 4

Relationship between IP and strain in the third LP

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Fig. 5

Relationship between IP and strain in the fourth LP

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Fig. 6

Testing result of the internal pressure in fourth LP

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Fig. 7

Comparison of the testing value with the theoretical value of N80 casing

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