STRESS ANALYSIS AND DESIGN IMPROVEMENTS OF ROTATING DRILLING PIPE TOOL JOINTS BY FATIGUE APPROACH

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NODEH FARAHANI MOHAMMAD HOSSEIN; SADEGHI MOHAMMAD HOSSEIN; RASTI AMIR

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Journal: Modares Mechanical Engineering Year:2017 | Volume:17 | Issue:7 Page(s): 405-412

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Title

STRESS ANALYSIS AND DESIGN IMPROVEMENTS OF ROTATING DRILLING PIPE TOOL JOINTS BY FATIGUE APPROACH

Author(s)

NODEH FARAHANI MOHAMMAD HOSSEIN | SADEGHI MOHAMMAD HOSSEIN | RASTI AMIR | Issue Writer Certificate

Keywords

DOWN-HOLE DRILLINGQ1

API TOOL JOINTSQ1

FATIGUE LIFEQ2

Abstract

Nowadays, ease of accessibility to natural oil and gas wells has fallen significantly due to continuous drilling operations. The increasing demand for oil and gas has pushed drilling and exploration industry to drill ultra-deep or use complex methods like horizontal or directional drilling to reach for the oil and gas in deeper level. However, due to more complex conditions in these wells, Rods generally fail. This failure occurs in rod joints as they are the weakest link. In this research, API NC46 standard tool joint has been investigated considering real oil well condition. The goal is to find the weakest points in the drilling rod and present an economical and practical solution to increase the life time. Results show that the maximum stress occurs in the first engaged thread of pin and last engaged thread of box which makes these areas more vulnerable. In the following, using optimization of joint main parameters including threads geometry, make-up torque and shoulder sealing design, a new plan will be presented which has higher FATIGUE LIFE than the similar API standard tool joint. Maximum stress concentration factor of improved tool joints relatively decrease from 3.47 to 2.86 compared to standard joint. In addition, experimental tests show that the average FATIGUE LIFE of improved joint is 2.3 times more than the standard tool joint.

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APA: Copy

NODEH FARAHANI, MOHAMMAD HOSSEIN, SADEGHI, MOHAMMAD HOSSEIN, & RASTI, AMIR. (2017). STRESS ANALYSIS AND DESIGN IMPROVEMENTS OF ROTATING DRILLING PIPE TOOL JOINTS BY FATIGUE APPROACH. MODARES MECHANICAL ENGINEERING, 17(7 ), 405-412. SID. https://sid.ir/paper/179364/en

Vancouver: Copy

NODEH FARAHANI MOHAMMAD HOSSEIN, SADEGHI MOHAMMAD HOSSEIN, RASTI AMIR. STRESS ANALYSIS AND DESIGN IMPROVEMENTS OF ROTATING DRILLING PIPE TOOL JOINTS BY FATIGUE APPROACH. MODARES MECHANICAL ENGINEERING[Internet]. 2017;17(7 ):405-412. Available from: https://sid.ir/paper/179364/en

IEEE: Copy

MOHAMMAD HOSSEIN NODEH FARAHANI, MOHAMMAD HOSSEIN SADEGHI, and AMIR RASTI, “STRESS ANALYSIS AND DESIGN IMPROVEMENTS OF ROTATING DRILLING PIPE TOOL JOINTS BY FATIGUE APPROACH,” MODARES MECHANICAL ENGINEERING, vol. 17, no. 7 , pp. 405–412, 2017, [Online]. Available: https://sid.ir/paper/179364/en

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