Downhole leakage failure analysis and structural optimization of a cap-plate logging while drilling tool

QIN Caihui; LU Huatao; ZHU Yuning; CAO Yunfeng and YANG Yang; ${author.authorNameEn}

doi:10.12143/j.ztgc.2023.02.006

2023 Vol. 50, No. 2

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Article navigation > DRILLING ENGINEERING > 2023 > 50(2): 39-47

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QIN Caihui, LU Huatao, ZHU Yuning, CAO Yunfeng and YANG Yang, . 2023. Downhole leakage failure analysis and structural optimization of a cap-plate logging while drilling tool. DRILLING ENGINEERING, 50(2): 39-47. doi: 10.12143/j.ztgc.2023.02.006

Citation:

QIN Caihui, LU Huatao, ZHU Yuning, CAO Yunfeng and YANG Yang, . 2023. Downhole leakage failure analysis and structural optimization of a cap-plate logging while drilling tool. DRILLING ENGINEERING, 50(2): 39-47. doi: 10.12143/j.ztgc.2023.02.006

Downhole leakage failure analysis and structural optimization of a cap-plate logging while drilling tool

1.China Oilfield Services Co., Ltd., Beijing 1001149， China;
2.CNOOC （Tianjin） Pipeline Engineering Technology Co., Ltd., Tianjin 300452， China

Received Date: 14 June 2022

Revised Date: 01 January 2023

Abstract

Abstract

A cap-plate logging while drilling tool experienced internal leakage in downhole operation due to the penetration crack between the inner channel and the T-groove bottom. The original location of the crack was determined through analysing the morphology of the penetrating crack， and then the cause for the penetrating crack was determined through the macro- and micro-analysis of the fracture. Finally， the structure of the tool was optimized with the finite element analysis to improve the service life. The analysis results show that the presence of large stress concentration and the cutting marks at the bottom edge of the T-shaped groove led to the fatigue penetration crack， which causes the intrusion of drilling mud， and the crack originated from both sides of the through bore at the bottom of the groove. The stress distribution can be improved by optimizing the groove bottom fillet and other measures.
- cap-plate /
- logging while drilling tool /
- leakage /
- failure analysis /
- structural optimization

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References

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