Elastic-plastic collapse limit analysis of coiled tubing under complex stress state

Tong, Shaokai; Gao, Deli

doi:10.1016/j.petrol.2018.11.018

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…The findings of the current study demonstrate that the collapse pressure in different CTs increases with an increase in external pressure, which makes the CT pipe fail. This finding was also observed by different researchers, who demonstrated that during oil and gas production, external pressure causes collapse failure in the CT 15 . In addition, a CT with a lower yield strength, i.e., QT 800, would fail as break-down chances are higher under collapse pressure than QT 900 and QT 1000 CT materials (Table 5 ) (Figs.…”

Section: Discussionsupporting

confidence: 83%

“…All of the limit curves in Figs. 7,8,9,10,11,12,13,14,15 show that the ∆P values for CT with a diameter increase are less than the ∆P values for CT without diameter growth. When a diameter increase is considered, the working limit of a CT pipe decreases.…”

Section: Resultsmentioning

confidence: 96%

“…The CT is subjected to various stresses, plastic deformation, and internal pressure while in operation to restrict the fatigue life of the tube 15 , 16 . In addition, bending strains form on CT as a result of deployment and retrieval.…”

Section: Introductionmentioning

confidence: 99%

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Computational analysis of coiled tubing concerns during oil well intervention in the upper Assam basin, India

Neog

Sarmah

Baruah

2023

Sci Rep

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Coil tubing (CT) is widely regarded as one of the most effective servicing tools for dealing with a variety of oil and gas production issues, and it is also commonly used for oil well workover operations in India's upper Assam basin. The current work considers QT 800 to be the CT material used for actual oil well operations. With reference to actual operations carried out in some of the oil wells in the upper Assam basin, the current research analyses the limitations of CTs (QT 800, QT 900, and QT 1000) based on developing limit curves that can depict the operating limit and infer CT failure probability. This study also includes fatigue analysis to determine the likelihood of damage from hot oil circulation, water injection, and nitrogen shot operations while performing them using the CTs (QT 700, QT 800, QT 900, and QT 1000). The current work adopts the methodology of CT assessment based on a computational model built in MATLAB with respect to different oil well parameters in the upper Assam basin. This study takes an innovative approach by taking downhole temperature into account when determining the CT limit for QT 800, which signifies novelty in the current work. According to the computational analysis used in the study on CT limits, mechanical strain, thermal strain, and the combined strain of the CT material all affect CT elongation. This observation was often found to be a research gap in different research works as this aspect in previous studies was not considered while analysing CT operations. The findings of the present study highlight and draw the conclusion that temperature variations in the well and the CTU’s circulating fluid contribute linearly to CT strain. CT’s working limit diminishes with increasing internal and external pressure and diametrical growth, which eventually causes fatigue damage.

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Section: Discussionsupporting

confidence: 83%

Section: Resultsmentioning

confidence: 96%

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Computational analysis of coiled tubing concerns during oil well intervention in the upper Assam basin, India

Neog

Sarmah

Baruah

2023

Sci Rep

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“…Aiming at the problem of fatigue life prediction of coiled tubing, Liu et al [6] studied the influence of wall thickness, outer diameter, and curl radius of CT steel on the fatigue life of coiled tubing by establishing a mechanical model. Tong et al [7] established the elastoplastic collapse limit model and analyzed the influence of axial force, buckling, and internal pressure on the elastoplastic failure limit of coiled tubing. Hu et al [8] analyzed the bending deformation of thin-walled tubes under the combined action of internal pressure and bending moment by using plastic theory.…”

Section: Introductionmentioning

confidence: 99%

Influencing Factors on Plasticity and Life of Hydraulic Pipelines for Logging

Fan

Wang

et al. 2023

J. Phys.: Conf. Ser.

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The bending behavior of the hydraulic pipeline on the roller of the logging winch will cause a certain plastic deformation of the hydraulic pipeline, which has a certain influence on its performance. In view of the above problems, this paper uses finite element analysis software to analyze the plastic deformation law of hydraulic pipelines under different bending radii. It can be found from the analysis results that during the bending process, the plastic deformation of the metal continuous capillary gradually increases with the neutral layer outward. In the range of the bending radius from 75 mm to 150 mm, with the increase of the bending radius, the equivalent plastic deformation decreases from 3.5×10-2 to 1.46×10-2. The changing trend of life also tends to be gentle with the increase of the bending radius, and the number of cycles increases from 25000 to 398107. The analysis of the plastic deformation law and the life of hydraulic pipelines provides a reference for designing winch drums.

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Unified plastic limit analysis of the cap bottom generated by a dedicated cutting tool in orbital drilling

Lan

et al. 2021

Int J Adv Manuf Technol

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Elastic-plastic collapse limit analysis of coiled tubing under complex stress state

Cited by 10 publications

References 12 publications

Computational analysis of coiled tubing concerns during oil well intervention in the upper Assam basin, India

Computational analysis of coiled tubing concerns during oil well intervention in the upper Assam basin, India

Influencing Factors on Plasticity and Life of Hydraulic Pipelines for Logging

Unified plastic limit analysis of the cap bottom generated by a dedicated cutting tool in orbital drilling

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