Heat treatment of connector ends and tool-joint parts of drill pipe in a semiautomatic gas-fired unit

1972 ◽  
Vol 8 (1) ◽  
pp. 44-46
Author(s):  
M. M. Melikov ◽  
S. M. Gadzhibeklinskii ◽  
K. T. Aliev ◽  
Ya. B. Shlimak
Keyword(s):  
Heat Treatment ◽  
Drill Pipe ◽  
Tool Joint

Heat treatment of drill pipe of strength group D

Metallurgist ◽  
1989 ◽  
Vol 33 (11) ◽  
pp. 225-226 ◽  
Author(s):  
V. K. Chernykh ◽  
L. A. Pisareva ◽  
K. M. Pikalova ◽  
V. A. Rodikov
Keyword(s):  
Heat Treatment ◽  
Drill Pipe ◽  
Strength Group ◽  
Group D

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.

The Effect of Tool Joint Stiffness on Drill Pipe Fatigue in Riser Ball Joints

1989 ◽  
Vol 111 (4) ◽  
pp. 369-374 ◽  
Author(s):  
A. Ertas ◽  
W. R. Blackstone ◽  
B. K. Majumdar
Keyword(s):  
Fatigue Damage ◽  
Joint Angle ◽  
Drill Pipe ◽  
Joint Stiffness ◽  
Finite Element Models ◽  
Ball Joint ◽  
Marine Riser ◽  
Joint Angles ◽  
Ball Joints ◽  
Tool Joint

It is well known that the ball joint in a marine riser can cause fatigue damage in the drill pipe passing through. Previous investigators have assessed the damage done for a lower ball joint angle of 3–5 degrees (drilling) and 1–3 degrees (running casing). This paper extends that work to deep water operations in which an upper ball joint is also present. Also, it is shown, via finite element models, that tool joint bending stiffness can have a significant effect on fatigue life. Fatigue damage calculations, including this heretofore unconsidered effect, are presented for various ball joint angles and drill pipe tensions.

Research on Drill Pipe’s Fatigue Life Prediction Based on Reliability

2019 ◽  
Vol 944 ◽  
pp. 975-980
Author(s):  
Fang Po Li
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Tensile Stress ◽  
Life Prediction ◽  
Stress Amplitude ◽  
Fatigue Cracks ◽  
Drill Pipe ◽  
Fatigue Life Prediction ◽  
Probability Density Distribution ◽  
Tool Joint

Fatigue life of drill pipe is studied systematically based on reliability analysis. Calculation results show that bending and tensile stress in drill pipe body is significantly greater than that in the tool joint during drilling process. Drill pipe body’s fatigue strength is about 500MPa under the condition that the stress ratio is -1. The fatigue strength of tool joint is about 360MPa under the condition that the average tensile stress is 496MPa. The fatigue fracture position of drill pipe is concentrated on pipe body, and most fatigue cracks originate from pipe’s outer surface. Compared with material fatigue life, the fatigue life of whole drill pipe is significantly lower. Under the condition that the confidence level is 95% and deviation is 5%, drill pipe’s fatigue life distribution is normal distribution while the stress amplitude is 660MPa, 620MPa, 580MPa and 540MPa respectively. With the decreasing of stress amplitude, the peak of logarithmic fatigue life’ probability density distribution curve decreases gradually, and its dispersion increases gradually. Drill pipe’s fatigue life prediction equations whose reliability are 50%, 90%, 99% and 99.9% are calculated separately.

Evaluation on Chloride Cracking of S135 High-Strength Drill Pipe

2012 ◽  
Vol 430-432 ◽  
pp. 636-639
Author(s):  
Zhang Zhi ◽  
Xiao Yu Zhou ◽  
De Zhi Zeng ◽  
Ji Yin Zhang ◽  
Tai He Shi
Keyword(s):  
Heat Treatment ◽  
Weld Joint ◽  
Friction Welding ◽  
Drilling Fluid ◽  
Drill Pipe ◽  
High Strength ◽  
Chloride Ions ◽  
Post Weld Heat Treatment ◽  
Uniform Corrosion ◽  
Weld Heat

During the process of deep drilling with high temperature and high pressure, downhole drilling tools might be exposed to various corrosive mediums, such as water/oil-based drilling fluid systems, dissolved oxygen, H2S/CO2, halogen elements (Cl- and Br-), etc. Halogen elements existing in the drilling fluid are ions promoting corrosion of metals. This effect is mainly manifested in the forms of uniform corrosion, pitting corrosion, stress corrosion cracking, etc. of carbon steel. Quality of the drill pipe is determined by the DP body, joint and welding area of the drill pipe. Reasonable friction welding process and proper post weld heat treatment can make the mechanical property of weld joint satisfy related standards. If process of friction welding or post weld heat treatment is improper, the weld joint will be easily damaged and accidents of pricking, breaking, etc will be likely aroused. This paper carries out an evaluation experiment of chloride cracking on the DP body, joints and weld joints of the high-strength drill pipe (S135) and discusses corrosion of the high-strength drill pipe caused by chloride ions.

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