Numerical investigation and structural optimization of bonded joints with fiber reinforce plastic sucker rods in offshore reservoirs

ABSTRACT

Sucker rod constructed of FRP (fiber-reinforced plastic) is currently used in offshore oil and gas industries due to its high tensile strength, lightweight, and resistance to corrosion. Due to the fact that the surface of FRP sucker rod cannot be threaded, it is often attached to steel joints via adhesive technology, and the bonded joint of FRP sucker rod is particularly prone to breaking and coming off. The current research is primarily concerned with the mechanical properties of FRP sucker rods, with little emphasis on the adhesive performance of bonded connections. This research developed a numerical model with a novel bonded joint structure based on the cohesion failure criteria. An indoor test was used to determine and confirm the expected bonded joint failure load. Additionally, an orthogonal test was conducted to maximize the adhesion performance. The findings indicated that a) theaccuracy of numerical model was within 2% and b) when the groove angle was 30°, the length ratio was 2/23, each groove was 14 mm in length based on a triangular groove, and the anticipated failure stress of the bonded joint was around 443 kN, an increase of 10%.

KEYWORDS:

• Bonded groove structure
• numerical modeling
• orthogonal test
• predicted failure strength
• the bonded joint of FRP sucker rod

Acknowledgements

Financial support from the Fundamental Research Funds for the Central Universities (20CX02306A) for this study is gratefully acknowledged. In addition, we thank the support of the Opening Fund of the National Engineering Laboratory of Offshore Geophysical and Exploration Equipment.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported by the Fundamental Research Funds for the Central Universities [20CX02306A];Opening Fund of National Engineering Laboratory of Offshore Geophysical and Exploration Equipment;