Survival assessment of die-marked drill pipes:

Rahman, Motiur; Hossain, M.M.; Rahman, Sheik S.

doi:10.1016/s1350-6307(98)00052-1

Cited by 10 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many scholars have investigated fractured joints at drilling sites and found that joint fractures caused by thread fracture under the combined action of static and alternating loads are the main causes of downhole accidents [28,29]. Further research found that thread fractures generally occurred at the root of the first turn of the pin joint or the root of the last turn of the box joint, indicating that those two parts are prone to stress concentrations [30][31][32]. These results are in good agreement with the above simulation results.…”

Section: Effect Of the Axial Tensile Loadmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of the Axial Tensile Loadmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In refs. [5,6] the stress concentration effects caused by the die-marks on the static and fatigue failures were investigated. Alternatively, the upset zone can be a potential point of cracking in a drill pipe.…”

Section: Introductionmentioning

confidence: 99%

Resonant Fatigue Tests on Drill Pipe Connections with Different Geometries and Sizes

Santus

Romanelli

Burchianti³

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

In this study, a resonant bending fatigue test rig, designed and implemented by the University of Pisa, is presented, providing a detailed description of the set-up of the machine, the strain gauges calibrations, and the control system used with the main electronic devices. Several geometries of drill pipe connections and pipe samples made of different materials were tested, and all the obtained experimental fatigue results are presented in the paper and compared to previous experimental data. Fractographic images are provided to clearly show that, in two kinds of drill pipe connections, the crack initiation was found at the connection zone, whereas for another connection geometry, it was found at the pipe body. In order to interpret these latter results, a discussion about the section modulus of bending of the various sections of the drill pipes was provided, along with an FE model of a specific zone of one of these connections.

show abstract

“…However, the complex loading and the non-linear interactions with the borehole can lead to the appearance of several types of vibrations [5,6]. These vibrations could significantly accelerate the process of fatigue failure of the drilling system [7,8], especially if there are already cracks in the structure of the drill pipes [9]. Moreover, fatigue crack growth is the principal reason for the occurrence of sudden failures in the drilling field.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Circular Arc Crack Depths and Locations in Rotary Drilling Pipes Subjected to Free Vibrations

et al. 2022

View full text Add to dashboard Cite

Late detection of cracks can lead to serious failures and damages of drilling components, especially drill pipes and drill bits. Currently, the widely used method of repairing rotary drilling systems after a failure is corrective maintenance. Although this strategy has shown its effectiveness in many cases, waiting for a failure to occur and then performing a repair can be an expensive and time-consuming operation. Thus, the use of preventive maintenance under the aspect of periodic inspections can solve this problem and help engineers detect cracks before they reach critical sizes. In this study, modal analysis and finite element analysis (FEA) combined with artificial neural networks (ANN) were used to dynamically estimate the depth and location of a circular arc crack in the drill pipes of rotary drilling systems. To achieve this goal, a detailed analytical approach based on Euler–Bernoulli beam theory was adopted to validate the first four natural frequencies found by FEA for an undamaged pipe. Afterwards, an arc crack was assigned to the pipe already created using Abaqus, and the first four natural frequencies were obtained for each depth and location of the crack. Simulations with FEA led to the generation of a dataset with two inputs—depth and location of cracks—and four outputs: natural frequencies. Moreover, a multilayer perceptron (MLP) was designed and trained by the data collected from simulations. Finally, a comparison between the results obtained by FEA and ANN was performed, where both approaches showed a good agreement in predicting the depth and location of cracks.

show abstract

Survival assessment of die-marked drill pipes:

Cited by 10 publications

References 10 publications

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

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

Resonant Fatigue Tests on Drill Pipe Connections with Different Geometries and Sizes

Estimation of Circular Arc Crack Depths and Locations in Rotary Drilling Pipes Subjected to Free Vibrations

Contact Info

Product

Resources

About