Fatigue resonant tests on drill collar rotary shouldered connections and critical thread root identification

Santus, Ciro; Bertini, Leonardo; Burchianti, A.; Inoue, Tomoya; Sakurai, Noriaki

doi:10.1016/j.engfailanal.2018.02.027

Cited by 18 publications

(10 citation statements)

References 26 publications

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“…A potential fatigue initiation site on the drillstring is at the connection region, in particular at the first and last engaged threads (FET and LET) of the Pin and Box, respectively [3,6,8]. In a previous paper we investigated the drill collar connection [11] providing both full-scale testing and related Finite Element (FE) interpretation of the results obtained. A multi-axial fatigue analysis was performed by Lin et al [12], by comparing a drill collar double shoulder connection with respect to the single shoulder joint.…”

Section: Introductionmentioning

confidence: 99%

“…The former is for a short region, such as the drill collar connection, in which a few meters in length of the tubular element has a significant weight. The bending acts in a plane according to a reversal load cycle, and the test region is limited to the connection portion [11]. The other kind of resonant bench features a longer tubular specimen such as a relatively lighter drill pipe.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue resonant tests on S140 and S150 grade corroded drill pipe connections and pipe bodies

Santus

Burchianti²,

Inoue

et al. 2020

International Journal of Pressure Vessels and Piping

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue resonant tests on S140 and S150 grade corroded drill pipe connections and pipe bodies

Santus

Burchianti²,

Inoue

et al. 2020

International Journal of Pressure Vessels and Piping

Self Cite

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“…A threaded joint is one of the weakest and most critical components of a core drilling tool [1]. A threaded joint is a typical thin-walled structure that operates in a harsh working environment and is mainly subjected to tensile loads and torsional loads.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization for the Thin-Walled Joint Thread of a Coring Tool Used for Deep Boreholes

et al. 2020

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Threaded joints are key components of core drilling tools. Currently, core drilling tools generally adopt the thread structure designed by the API Spec 7-1 standard. However, fractures easily occur in this thread structure due to high stress concentrations, resulting in downhole accidents. In this paper, according to the needs of large-diameter core drilling, a core barrel joint was designed with an outer diameter of Φ135 mm and a trapezoidal thread profile. Subsequently, a three-dimensional simulation model of the joint was established. The influence of the external load, connection state and thread structure on the stress distribution in the joint was analyzed through simulations, from which the optimal thread structure was determined. Finally, a connection test was carried out on the threaded joint. The stress distribution in the joint thread was indirectly studied by analyzing gas leaks (i.e., the sealing effect) under axial tension. According to the test data and the simulation results, the final joint thread structure was optimized, which lays a good foundation for the design of a core barrel.

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“…A potential fatigue initiation site on the drillstring is at the connection region, in particular at the first and last engaged threads (FET and LET) of the Pin and Box, respectively. 4,7,9 In a previous paper we investigated the drill collar connection 11 providing both full-scale testing and related Finite Element (FE) interpretation of the results obtained. A multi-axial fatigue analysis was performed by Lin et al, 12 by comparing a drill collar double shoulder connection with respect to the single shoulder joint.…”

Section: Introductionmentioning

confidence: 99%

Analysis of fatigue behaviour of drill pipe on pin-box connection

Özgüç

2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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Drilling is one of the costliest and risky activities in oil and gas industry due to complexity of interactions with downhole formation. Cyclic loads while drilling cause the initiation and growth of cracks in oil tubulars. This phenomenon, known as fatigue, results in permanent reduction of the failure-free service envelope of a certain tubular. Further, most of the drill string failures are triggered by fatigue, which results from repetitive cyclic bending loads and stresses in tensile or buckled drill strings. Fatigue is a cumulative and non-reversible condition induced by repetitive cyclic bending loads and tensile or buckled drill pipe stresses. Fatigue exists even though cyclic tension of the drill pipe material is much lower than static strength limit. Present work investigates fatigue capacity of the 4” WT38 drill pipe connection where cracks have been observed. In accordance with the geometry of connection, a hot spot stress from bending moment is calculated in the crack location in the first thread (upper) of the pin. The DNVGL-RP-C203 SN-curve B1 “in air” is used as relevant fatigue SN curve for the drill pipe thread location. Finite element method (FEM) is employed in modeling and analyzing of drill pipe on pin-box connections. With this method, various connections can be investigated relatively faster and cheaper compared with experimental tests. It is found that the fatigue failure may have been caused as a result of the cyclic load level and number of load cycles. A detailed discussion of the fatigue damage assessment concludes the paper.

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Fatigue resonant tests on drill collar rotary shouldered connections and critical thread root identification

Cited by 18 publications

References 26 publications

Fatigue resonant tests on S140 and S150 grade corroded drill pipe connections and pipe bodies

Fatigue resonant tests on S140 and S150 grade corroded drill pipe connections and pipe bodies

Design Optimization for the Thin-Walled Joint Thread of a Coring Tool Used for Deep Boreholes

Analysis of fatigue behaviour of drill pipe on pin-box connection

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