Controlled failure design of drillstring threaded connections

Knight, Matthew J.; Dover, W.D.

doi:10.1046/j.1460-2695.2003.00697.x

Cited by 14 publications

(3 citation statements)

References 13 publications

(23 reference statements)

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“…In the 20th century, with the advancement of manufacturing technology, the comprehensive performance of drill pipe joint has greatly improved, and low stress brittle fracture failure has been effectively controlled. Statistical data shows that 65% to 75% of drill pipe joint failures are related to fatigue [12,13]. Zhi et al put forward the common failure causes of drill pipe internal thread joint cracking, perforation leakage, drill pipe body piercing fracture and so on, and puts forward some relevant suggestions in view of these factors [14].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Cracking Cause of Drill Pipe Joint Used in an Ultra Deep Well

Zhao,

Hu,

Zheng

et al. 2024

J. Phys.: Conf. Ser.

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The drill pipe joint cracked during service, resulting in joint failure. The geometric dimensions of thread, chemical composition and microstructure of the drill pipe joint were tested. The geometric dimensions, chemical composition and microstructure were found to comply with the standard requirements. The whole macroscopic fracture didn’t show obvious corrosion product. The tensile properties, Charpy impact properties, and Brinell hardness met the standard requirements. Microstructure of fracture was analyzed, which showed a typical erosion micromorphology with parallel arranged fatigue strips. Through simulation analysis, it was found that the location of cracking was the stress concentration area. The failure mechanism of the drill pipe joint was revealed. The stress concentration led to fatigue cracking at the drill pipe joint. After the fatigue crack penetrated through the wall thickness, the drilling fluid leaked from the inner wall to the outer wall. The flow rate of the leaking drilling fluid is significantly increased. And it is sprayingly leaked, which further leads to fan-shaped erosion damage of the cracked surface from the inner wall to the outer wall.

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Section: Introductionmentioning

confidence: 99%

Investigation on Cracking Cause of Drill Pipe Joint Used in an Ultra Deep Well

Zhao,

Hu,

Zheng

et al. 2024

J. Phys.: Conf. Ser.

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“…In offshore applications, those connections are subjected to cyclic loads due to currents, the tide, movement of the oil platform... For drill strings the most common (between 65% and 75% [1][2][3]) failure modes of threaded connections are caused by fatigue. Failure of the connection is a costly problem in the oil and gas industry and it has a serious impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Fatigue behaviour of threaded couplings – experimental research

Meertens¹,

Baets²,

Waele³

et al. 2010

IJSMED

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In this article the fatigue behaviour of threaded connections is studied, as used in oil country tubular goods (OCTG). Some manufacturers have designed their own couplings (so called „premium connections‟) and they claim having an improved fatigue life or better sealability. This study will compare different coupling designs with the standard API connection. The methods used to compare the different designs are based on two-dimensional finite element analyses. Experimental research is conducted to validate the results of the FEA. The experimental research consists of a 4-point bending fatigue test, which will result in a SN-curve for the threaded connection. Based on numerical and experimental results a performance factor is deduced for the particular connection design. This factor will be used to find the best design of threaded couplings. As eventual goal of this study, with the insights gained, a threadedconnection with optimized fatigue life and sealability will be designed.

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“…The benefits of compressive residual stresses in enhancing fatigue performance are well known. Screw thread roots, shaft fillets and many other machine details are routinely cold rolled for this reason, and improvements in resistance to fatigue crack initiation by a factor of up to five fold are not uncommon (Knight et al, 2003(Knight et al, , 2004(Knight et al, , 2005. Features of residual stresses in metals are that they are often transient in nature and can relax under cyclic loading and at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Control in Structural Details Using Surface Peening

Ngiam

2008

Journal of Ship Production

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This paper presents an analytical and experimental study of crack shape evolution in steel plate specimens under cyclic loading. It is widely known that the introduction of compressive residual stresses by cold working the surface can be highly beneficial in improving the fatigue performance of structural components. Although it is recognized that relaxation of surface compressive residual stress can reduce the potential benefits, the effects of residual stress on crack shape evolution are often overlooked. Previous studies have shown that the intensity of the surface compressive residual stress has a pronounced effect on fatigue crack initiation. A recently developed technique termed controlled stitch cold working, which applies differing intensities of compressive residual stress at specific regions in a structure, is shown in the paper to influence fatigue crack propagation life considerably. The approach can be used to prevent crack growth in particular directions, for example, encouraging a controlled or fail-safe scenario. The paper describes fatigue crack growth tests on shot peened specimens tested under uniaxial tension. The specimens were peened to varying intensities and of differing coverage areas. Cracks were initiated from starter notches after peening, meaning the approach can be used for fatigue performance enhancement at the construction stage or later as part of a maintenance and repair strategy. Crack growth retardation is apparent in all tests, and this is attributed to the constrained crack shape. Further work will consider the use of laser and ultrasonic peening to contain cracks from rapidly propagating from stress concentrations. This approach used with careful design of stiffness can significantly extend the fatigue crack propagation resistance of ship and offshore structures.

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Controlled failure design of drillstring threaded connections

Cited by 14 publications

References 13 publications

Investigation on Cracking Cause of Drill Pipe Joint Used in an Ultra Deep Well

Investigation on Cracking Cause of Drill Pipe Joint Used in an Ultra Deep Well

Fatigue behaviour of threaded couplings – experimental research

Fatigue Crack Control in Structural Details Using Surface Peening

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