Comparative Strength Analysis of Aluminum Drill Pipes With Steel Connectors Assembled by Different Methods

2011 ◽  
Author(s):  
Vadim Tikhonov ◽  
Danila Davydov ◽  
Rudolf Alikin ◽  
Mikhail Gelfgat
Keyword(s):  
Tensile Load ◽  
Theoretical Aspect ◽  
Small Scale ◽  
Strength Analysis ◽  
Bending Load ◽  
Joint Connection ◽  
Drill Pipes ◽  
Aluminum Pipe ◽  
Alternating Bending ◽  
Tool Joint

Aluminum alloys continue to be among the promising materials for manufacture of drill pipes and risers for deepwater and ultra-deepwater environment. Steel tool-joints attached to aluminum alloy pipes increase the number of make-ups and break-outs. Currently, aluminum drill pipes (ADP) are assembled by “cold” or “hot” methods. By the first method, the pin and box are screwed on the pipe with a “sufficiently” high specified make-up torque. By the second method, the pin and box of the tool joint are heated and screwed on the ends of the pipe without effort. After cooling, the shrinkage of the tool joint units creates a reliable permanent threaded “pipe – tool joint” connection. The first method is easier than the second one; however the comparative strength of these ADP connections has not been enough clear. The paper presents the results of comparative strength analysis of both types of connection after assembly at applying tensile load and alternating bending load. The theoretical aspect of the study includes a detailed FEA of “hot” and “cold” assembly connections at applying tensile load and alternating bending load with SCF evaluation. The experimental data are presented as the results of tensile testing of small-scale specimens, removed from different aluminum pipe sections that were heated during “hot” assembly. Finally, full-scale specimens of both types of connections were tested for tensile capacity and fatigue. The comparative strength of both types of connections is concluded.

Experimental and Numerical Evaluations of Aluminum Drill Pipes Under Cyclic Loads

2006 ◽  
Author(s):  
Marcelo Igor Lourenc¸o ◽  
Theodoro A. Netto ◽  
Neilon S. Silva ◽  
Paulo Emi´lio Valada˜o de Miranda ◽  
Joa˜o Carloes Ribeiro Pla´cido
Keyword(s):  
Drill Pipe ◽  
Fatigue Tests ◽  
Full Scale ◽  
Experimental Program ◽  
Small Scale ◽  
Strain Stress ◽  
Drill Pipes ◽  
Aluminum Pipe ◽  
Tool Joint ◽  
Joint Assembly

Experimental program and numerical analyses were carried out to investigate the fatigue mechanisms of aluminum drill pipes designed and manufactured in compliance with ISO 15546. Material mechanical properties, including S-N curve, were determined through small-scale tests on specimens cut from actual drill pipes. Full-scale experiments were also performed in laboratory. Initially, the tool-joint assembly procedure was actually performed to monitor the resulting strain/stress level in selected points of the aluminum pipe. Three full-scale aluminum drill pipe specimens were then fatigue tested under combined cyclic bending and constant axial tension. In parallel, a finite element model of the tool-joint region, where two drill pipe specimens failed in the fatigue tests, was developed. The model was first used to reproduce the tool-joint assembly. Then, the physical experiments were simulated numerically in order to obtain the actual stress distribution in this region. Good correlation between full-scale and small-scale fatigue tests was obtained by adjusting the strain/stress levels monitored in the full-scale tests in light of the numerical simulations.

Application, Calculation and Experimental Evaluation of SCF for Aluminum Drill Pipe With Steel Connector

2010 ◽  
Author(s):  
Vadim Tikhonov ◽  
Alexander Kultsep ◽  
Rudolf Alikin ◽  
Mikhail Gelfgat ◽  
Vladimir Basovich ◽  
...  
Keyword(s):  
Fatigue Testing ◽  
Drill Pipe ◽  
Bending Moment ◽  
Full Scale ◽  
Fatigue Properties ◽  
Small Scale ◽  
Steel Tool ◽  
Friction Factors ◽  
Bending Load ◽  
Drill Pipes

Aluminum alloys are among the most promising materials for manufacture of drill pipes for deepwater and ultra-deepwater drilling in corrosive environment. Aluminum drill pipes are made with steel tool-joints to increase the number of connection makings-and-breakings. One of the major concerns of aluminum drill pipe operation in deepwater complex profile wells is the fatigue of their connection. This paper presents the results of study of fatigue properties of aluminum alloy 1953T1 Light Alloy Drill Pipes of Improved Dependability (LAIDP) 147×13 mm that are most extensively used in Russia. During assembly, the pin and box of steel tool-joint are heated and screwed on the tubular ends. After cooling, this assembly provides a reliable permanent connection. The study includes experimental determination of the S-N curve of small-scale specimens of aluminum tubular, FEA of the connection with the SCF determined and fatigue testing of the full-scale LAIDP connection. FEA is based on 3D model. The material properties of tubular are modeled as elastic-plastic. The distribution of hot-assembly stresses is considered in detail. Alternating bending load is applied by several semi-cycles. The results of analysis of Stress Concentration Factor (SCF) at various axial loads, bending moment ranges, friction factors of contact surfaces and interference of connection are given. Full-scale fatigue testing of connection specimen is carried out to verify the results of analysis.

MULTIAXIAL FATIGUE OF ALUMINUM DRILL PIPES - EXPERIMENTS AND NUMERICAL ANALYSES

2021 ◽  
pp. 1-27
Author(s):  
Marcelo Igor Lourenço ◽  
Theodoro Antoun Netto ◽  
Neilon Silva ◽  
João Carlos Plácido
Keyword(s):  
Element Model ◽  
Complex Stress ◽  
Complex Stress State ◽  
Multiaxial Fatigue ◽  
Full Scale ◽  
Numerical Analyses ◽  
Small Scale ◽  
Drill Pipes ◽  
Full Scale Tests ◽  
Tool Joint

Abstract This paper presents an experimental test program and numerical analyses conducted on aluminum alloy drill-pipes with two different geometries. Small-scale characterization tests were conducted to determine both the material mechanical properties and the fatigue SN curves. Full-scale fatigue tests of the components are also presented. A finite element model of the drill pipes, including the tool-joint region, was developed. The model simulates, through different load steps, the tool-joint hot assembly and the experimental loads in order to obtain the actual stress distribution during the full-scale tests. Maximum stress amplitude in the aluminum pipes was found to be coincident with the edge of the connector, at the same location where failure was observed in full-scale tests. The study revealed that such pipes present a complex stress state near their connection to the steel tool joints due to their geometry and the residual stresses induced during the assembly of the steel connectors onto the aluminum pipes. Finally, multi-axial fatigue models were calibrated with the results of the small-scale tests and applied to the stress-strain state obtained numerically. Theoretical predictions were correlated to full-scale fatigue test results.

Aluminum Drill Pipes: Material and Design Developments

2008 ◽  
Author(s):  
Marcelo Igor Lourenc¸o ◽  
Theodoro A. Netto ◽  
Joa˜o Carlos Ribeiro Pla´cido
Keyword(s):  
Mechanical Design ◽  
Fatigue Behavior ◽  
Axial Stress ◽  
Drill Pipe ◽  
Element Model ◽  
Fatigue Tests ◽  
Small Scale ◽  
Physical Experiments ◽  
Drill Pipes ◽  
Tool Joint

An extensive research program on the structural strength of aluminum drill-pipes is being conducted at COPPE/UFRJ. The main objective is to improve the fatigue performance of these components by selecting the appropriate aluminum alloy and by enhancing the mechanical design of the threaded steel connector. This paper presents the experimental test program and numerical analyses conducted on a drill-pipe of different materials (Al-Zn-Mg alloy) and geometries from those previously presented [1,2]. Small-scale specimens were tested to determine its uni-axial stress-strain and fatigue behavior. Full-scale fatigue test results are also presented. A finite element model of the drill pipe, including the tool-joint region, was developed. The model simulates, through different load steps, the tool-joint hot assembly, and then reproduces the physical experiments numerically in order to obtain the actual stress distribution. The correlation between full and small-scale fatigue tests is performed via multi-axial fatigue models. The weak points of the current practice design are highlighted for further development.

scholarly journals Protection enhancing of threaded connections of light-alloy drill pipes against contact corrosion

2021 ◽  
Vol 225 ◽  
pp. 03003
Author(s):  
Vladimir Malyshev ◽  
Mikhail Gelfgat ◽  
Arseniy Scherbakov ◽  
Alexey Alkhimenko
Keyword(s):  
Ceramic Coatings ◽  
Electrochemical Process ◽  
Operating Conditions ◽  
Light Alloy ◽  
Steel Tool ◽  
Contact Corrosion ◽  
Threaded Connection ◽  
Drill Pipes ◽  
Aluminum Pipe ◽  
Tool Joint

When using light-alloy drill pipes (LAIDP) with steel tool joints, the development of contact corrosion is observed under certain operating conditions. The value of corrosion mainly depends on the difference in electrochemical potential (ECP) of the contacting metals. One of the effective methods for increasing the corrosion resistance of aluminum alloys is the micro-arc oxidation (MAO) method. This is an electrochemical process in combination with micro-arc-discharges phenomena at the anode-electrolyte border, which allows forming ceramic coatings of aluminum oxides on the surface, including its high-toughness and wear-resistant phase - α-Al2O3 (corundum). MAO-technology is a highly efficient and environmentally friendly process. At the forming of such a coating on the threaded part and in the tool joint zone of the pipe, a barrier for contact corrosion between the steel tool joint and the surface of the aluminum pipe is created. In this work, contact corrosion on samples in a pair of 1953T1 aluminum alloy - 40KhN2MA steel in a 5% NaCl solution at 80 °C was investigated. The data obtained showed the effectiveness of using protective MAO-coating to reduce contact corrosion and increase the reliability of the tool joint threaded connection of LAIDP.

scholarly journals Flax, Basalt, E-Glass FRP and Their Hybrid FRP Strengthened Wood Beams: An Experimental Study

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1255 ◽  
Author(s):  
Wang ◽  
Bachtiar ◽  
Yan ◽  
Kasal ◽  
Fiore
Keyword(s):  
Failure Modes ◽  
Maximum Load ◽  
Tensile Failure ◽  
Flexural Behavior ◽  
Single Type ◽  
Small Scale ◽  
Frp Composites ◽  
Bending Load ◽  
Wood Beams ◽  
Glass Frp

In this study, the structural behavior of small-scale wood beams externally strengthened with various fiber strengthened polymer (FRP) composites (i.e., flax FRP (FFRP), basalt FRP (BFRP), E-glass FRP (“E” stands for electrical resistance, GFRP) and their hybrid FRP composites (HFRP) with different fiber configurations) were investigated. FRP strengthened wood specimens were tested under bending and the effects of different fiber materials, thicknesses and the layer arrangements of the FRP on the flexural behavior of strengthened wood beams were discussed. The beams strengthened with flax FRP showed a higher flexural loading capacity in comparison to the beams with basalt FRP. Flax FRP provided a comparable enhancement in the maximum load with beams strengthened with glass FRP at the same number of FRP layers. In addition, all the hybrid FRPs (i.e., a combination of flax, basalt and E-glass FRP) in this study exhibited no significant enhancement in load carrying capacity but larger maximum deflection than the single type of FRP composite. It was also found that the failure modes of FRP strengthened beams changed from tensile failure to FRP debonding as their maximum bending load increased.

An Analysis and Experimental Study of the Rotor Blade with Composite Material Fiber Reinforced Plastics

2006 ◽  
Vol 306-308 ◽  
pp. 851-856
Author(s):  
C.Y. Son ◽  
H.I. Byun ◽  
K.H. Kim ◽  
J.K. Choi ◽  
J.Y. Shin
Keyword(s):  
Wind Turbines ◽  
Rotor Blade ◽  
Large Scale ◽  
Fem Analysis ◽  
Small Scale ◽  
Fiber Reinforced ◽  
Fatigue Load ◽  
Reinforced Plastics ◽  
Bending Load ◽  
Behavior Characteristic

In these days, large-scale wind turbines are being made of the Glass Fiber Reinforced Plastic (hereinafter F.R.P). Some reinforcement stiffeners such as carbon fiber and polyamide (Kevlar) are not economical for the wind turbine. In addition, the steel or aluminum alloy, featuring heavy weight and metallic fatigue load, is not suitable for global use, except very small-scale wind turbines. In this study, we manufactured a 10kW-grade small Rotor Blade with the F. R. P featuring high stiffness and good dynamic behavior characteristic, and carried out experiments for understanding the bending behavior characteristic of the fatigue load and bending load. And, we examined the experiment results through the Finite Element Method. We compared the experiment results and FEM analysis outputs using the commercial ANSYS FEM program.

Pressure Blow Out Assessment for Class 1 Piping With Local Wall Thinning

2006 ◽  
Author(s):  
Kunio Hasegawa ◽  
Katsuyuki Shibata
Keyword(s):  
Internal Pressure ◽  
Nuclear Power ◽  
Tensile Load ◽  
Evaluation Methodology ◽  
Evaluation Procedure ◽  
Seismic Load ◽  
Analytical Evaluation ◽  
Wall Thinning ◽  
Bending Load ◽  
Class 1

Wall thinning caused by the flow of water in power piping systems became a major concern to the nuclear power industries. ASME Code Case N-597-3, “Requirements for Analytical Evaluation of Pipe Wall Thinning,” provides procedures and criteria for Code Class 2 and 3 piping for the evaluation of wall thinning. However, analytical evaluation procedure for Class 1 piping is not provideed in the Code Case. Recent full-scale experiments on locally thinned pipes have supported the development of more contemporary failure strength evaluation methodology for Class 1 piping. These evaluation methodologies are applicable for the loading type of bending, tensile or cyclic bending load. Prior to the failure by bending moment, tensile load or cyclic/seismic load, locally wall thinned pipes shall be considered pressure blow out by the internal pressure itself. This paper introduces the failure of a uniformly thinned cylinder by an internal pressure and describes limitation on wall thinning depth to avoid pressure blow out for Class 1 piping.

scholarly journals THREAD RESTORATION TECHNOLOGY OF TOOL-JOINT IN DRILL PIPES BY METHOD OF ELECTRIC CONTACT WELD DEPOSITION INTO UPSET GROOVE

2018 ◽  
Vol 2018 (7) ◽  
pp. 19-25
Author(s):  
Андрей Паренко ◽  
Andrey Parenko ◽  
Константин Макаренко ◽  
Konstantin Makarenko
Keyword(s):  
Drill Pipe ◽  
Thermal Impact ◽  
Electric Contact ◽  
Major Repair ◽  
Impact Area ◽  
Drill Pipes ◽  
Tool Joint

In connection with a relatively high cost of drill pipes large companies loss caused by rejection achieves tens millions of rubles. And at the same time it is necessary to take into account that the tool-joint thread rejection does not mean at all unworthiness to operation a drill pipe itself as having restored an inter-lock it is possible to continue the operation of a res-tored product. In such a way, one of the priority direc-tions at major repair of drill pipes is a restoration of interlock geometrical joints. In this paper there is considered a technology for repair of a worn thread in an interlock of drill pipes and its updating at the expense of electric contact weld deposition used into an upset groove. The method of-fered allows keeping a pipe without its shortening at repair at the expense of additional metal application directly upon a thread area and decreasing a thermal impact area and also increasing operation properties of a restored pipe.

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