Fracture Failure Analysis of N80 Q Marine Casing

Zhang, Hong; Luo, Quan Sheng; Liu, Xu Hui; Wang, Peng; Feng, Dong

doi:10.4028/www.scientific.net/amm.318.331

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Regarding the fracture failure of the threaded connection, zhang xu found that the casing material presented brittleness at low temperature, and local stress concentration occurred on the surface of the casing tube, which resulted in brittle fracture of the casing tube [1]. Zeng zhong proposed that non-standard operation in the upper shackle would lead to the increase of local contact stress in the thread segment and the increase of thread advance resistance, aiming at the fracture failure of steel casing of P110 steel grade [2].…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of long round thread in horizontal well casing under multi-axis loading

Lin

Zhao

et al. 2020

E3S Web Conf.

View full text Add to dashboard Cite

The casing is subjected to complicated forces underground, and the threaded joint of the casing is the weak link of the casing. becoming more and more severe, various kinds of failure accidents often occur in practical use. Therefore, in view of the casing thread fracture failure during the process of volumetric fracturing in well W of an oil field. The finite element model of 5-1/2"API casing long round threaded joint was established in this paper, ABAQUS software was used to simulate and analyze the stress and deformation of casing thread under the loading state of overlock, axial tension and pressure, and fracturing internal pressure. The results show that the stress distribution of teeth is reasonable. Under the condition of axial tension and compression, the maximum stress of casing thread exceeds the yield strength into plasticity and causes damage. However, when fracturing and stimulation technology is implemented, the stress of the collar and casing body increases significantly, and the fracture is caused by fatigue and extended fracture under the alternating fracturing load. The finite element analysis results are consistent with the field failure results. Study the influence of downhole complex working condition on casing thread by simulation, which is of great significance to the protective casing.

show abstract

Section: Introductionmentioning

confidence: 99%

Failure analysis of long round thread in horizontal well casing under multi-axis loading

Lin

Zhao

et al. 2020

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

Evaluation of Mechanical Properties of Different Casing Drilling Steels

Zhang

et al. 2023

Metals

View full text Add to dashboard Cite

An investigation into the mechanical properties of K55, N80, and P110 steels commonly used for casing drilling was carried out together with microstructural and fractographic analysis. The results show that P110 steel consisted of almost fully tempered martensite and exhibited a synergy combination of static tensile, dynamic impact, and fatigue crack propagation properties among the three steels, possessing a higher fatigue limit and deeper crack tolerance before failure occurred. The K55 steel consisted of the pearlite and network structure of ferrite and possessed a high strain hardening exponent and low impact property, which led to the more suitable application under incidental large overload and temperature change, but it was unsuitable under the condition of higher impact force. The properties of N80 steel were moderate, and its fatigue property was higher than that of K55 and lower than that of P110; its incidental overload resistance was also higher than that of P110. The casing drilling steel can be selected according to the environment.

show abstract

Fracture Failure Analysis of N80 Q Marine Casing

Cited by 2 publications

References 0 publications

Failure analysis of long round thread in horizontal well casing under multi-axis loading

Failure analysis of long round thread in horizontal well casing under multi-axis loading

Evaluation of Mechanical Properties of Different Casing Drilling Steels

Contact Info

Product

Resources

About