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Chen F.,Shanghai University | Di Q.,Shanghai University | Wang W.,Shanghai University | Wang M.,Shanghai University | And 2 more authors.
Shiyou Xuebao/Acta Petrolei Sinica | Year: 2013

In order to evaluate the sealing performance of tool joint in large axial load and ensure the usability of tool joint, a precision finite element model of double shoulder tool joint was established using three-dimensional finite method to describe the sealing mechanism of tool joint. This model could analyze mechanical characteristics of tool joints under actions of make-up torque and axial tension. The results showed that: The sealing performance of double shoulder tool joint was mainly with the primary and secondary shoulder, and rational contact pressure which was produced by the primary and secondary shoulder guaranteed the sealing performance of tool joint; Axial tension may reduce the contact pressure on the primary and secondary shoulder, which weakened the sealing performance of tool joint; When the axial tension reaches to 2500 kN, the primary and secondary shoulder would lose their sealing performance, which increased the risk of stress corrosion of tool joint. These results could be taken as a reference in determining the ultimate lifting capacity of drill string and improving the performance of tool joint.


Chen F.,Shanghai University | Di Q.,Shanghai University | Wang W.,Shanghai University | Wang M.,Shanghai University | Yuan P.,Shanghai HiLong Petroleum Tubular Goods Research Institute
Yingyong Lixue Xuebao/Chinese Journal of Applied Mechanics | Year: 2012

Galling is the most common failure pattern of drill pipe joint, which may cause great loss to the oil field. From the viewpoint of mechanics, plastic deformation caused by excessive contact pressure is the root cause of the galling of tool joint. Three-dimensional finite element analysis of double shoulder tool joint is carried out and the distribution law of contact pressure and Von Mises stress of tool joint under make-up torque, axial tension and rotation torque are analyzed. According to the analysis, when the axial tension exceeds 2500kN, the contact pressure of primary shoulder will reduce to zero, thus make the load undertake by the thread primary, which increases the risk of thread galling. When the rotation torque exceeds 24000Nm, contact pressure of the secondary shoulder will increased greatly, which increases the failure risk of the secondary shoulder. Moreover, excessive rotation torque increases the bearing ratio of the thread, which increases the galling risk of the thread. Increase the gap of secondary shoulder and the contact area of primary shoulder appropriately can reduce the risk of failure of secondary shoulder in the extended reach wells. Increase the contact area of the primary and secondary shoulder appropriately can reduce the risk of galling in the ultra-deep wells. In the three load cases, the maximum Von Mises stresses are all located at the first engaged thread of the pin, which means galling is the most likely occur case and should be taken more consideration in the design of the tool joint. Results obtained can be taken as references in understanding the mechanical mechanisms of galling and reducing the galling failure of tool joint.


Chen F.,Shanghai University | Di Q.-F.,Shanghai University | Ouyang Y.-H.,Petrochina | Wang W.-C.,Shanghai University | And 3 more authors.
Gongcheng Lixue/Engineering Mechanics | Year: 2013

The double shoulder drill pipe has been widely used with the increase of well depth. Compared with a standard API drill pipe joint, a secondary shoulder is a significant feature of a double shoulder drill pipe joint, which offers an additional loading surface and mechanical stop to ensure the high torque resistance and good seal performance of a joint. According to the mechanical characteristics of a double shoulder drill pipe joint, a suitable clearance should be obligated in front of a secondary shoulder. The magnitude of the clearance determines the loading ratio of a secondary shoulder, which affects the stress distribution of a joint. The results show that the threads near a secondary shoulder will bear more stress and the failure risk of a secondary shoulder is increased when the clearance is small. However, when the clearance is large, the primary shoulder and the threads near a primary shoulder bear more loads. A suitable clearance of a secondary shoulder can improve the performance of a joint by optimizing its stress distribution.


Yan D.-F.,Shanghai Natural Gas Pipeline Network Co. | Liu N.-Y.,Shanghai Hilong Petroleum Tubular Goods Research Institute | Yuan P.-B.,Shanghai Hilong Petroleum Tubular Goods Research Institute | Shu J.,Shanghai Hilong Petroleum Tubular Goods Research Institute | Li Y.-E.,Shanghai Hilong Petroleum Tubular Goods Research Institute
Corrosion and Protection | Year: 2013

In order to study and master the condition of the stray current of natural gas 9 section pipeline in Shanghii and take corresponding measures the impact of stray current on gas pipeline was monitored using remote measurement system. The cathodic protection potential and the magnitude of potential gradient on ground surface were simultaneous measured. The results indicate that the current leakage in the Jinqiu road subway maintenance base was the interference source of stray current upon Shanghai high-pressure natural gas 9 section pipeline. The rail potential, grounding, track to earth insulation and overhead power line were also tested. The causes for the current leakage in the subway maintenance base were analyzed, and protective countermeasures were proposed based on the measured results. The countermeasures include to reinforce the construction and management of the rail insulation, the testing and measurement of the grounding electrode in the transformer substation, and the drained current protection.


Zhuang Y.,East China University of Science and Technology | Gao L.-X.,East China University of Science and Technology | Lu X.-N.,Shanghai Hilong Petroleum Tubular Goods Research Institute | Chen B.,Shanghai Hilong Petroleum Tubular Goods Research Institute | And 2 more authors.
Huadong Ligong Daxue Xuebao/Journal of East China University of Science and Technology | Year: 2015

This paper describes the specific structure of a double shoulder connection with a metal to metal seal structure. The connection's make-up torque is consisted of four parts friction torque, which come from inner, outer shoulder surface, sealing surface and thread contact surface. Due to the change of bearing structure, API recommended torque calculation formula is no longer suitable for gas sealing joint. In this paper, a conical interference fit model and stress-strain model are used to establish the corresponding torque calculation formula, and the reliability of the theoretical calculation is verified by finite element method. The theoretical calculation, finite element simulation and full size make-up test are combined to determine the optimal torque of the joint, which provides reference for manufactures and fields to determine the optimum make-up torque range of gas sealing joint. ©, YYYY, East China University of Science and Technology. All right reserved.


Yong Z.,East China University of Science and Technology | Lian-Xin G.,East China University of Science and Technology | Peng-Bin Y.,Shanghai Hilong Petroleum Tubular Goods Research Institute
Engineering Failure Analysis | Year: 2015

In this article threaded tool joints of gas sealing drill pipes, which are exposed to different tightening turns and tension load, are analyzed using an elaborate finite element modeling through the use of MSC.Marc13.0. The corresponding mechanics model is also established and the reliability of the model is verified by finite element simulation and full scale test. Some conclusive results have been drawn from the analysis including that the force distribution of the gas sealing joints is quite different from the API standard one, and the metal seal structure can greatly improve the seal performance of the joint under tension load. Research also shows that reasonable tightening turns can effectively reduce the thread axial load growth amplitude under the tensile load as a result improving the fatigue life of the tool joints. © 2015 Elsevier Inc.


Gao L.-X.,East China University of Science and Technology | Jiao W.-H.,East China University of Science and Technology | Dong Q.,East China University of Science and Technology | Yuan P.-B.,Shanghai Hilong Petroleum Tubular Goods Research Institute
Huadong Ligong Daxue Xuebao/Journal of East China University of Science and Technology | Year: 2013

The structure and design methods of a new premium-threaded high torque drill pipe connection HLBT-8A are described in this paper. The maximum yield make-up torque of the new tool joint was calculated approximately. By using the finite elements method, the threading-up characteristics of the connection were analyzed, especially the torque taken by main shoulder, deputy shoulder and thread. Finally, the make-up torque-turns curve was obtained, and it is verified by the full scale test. Calculation and testing results show that this new type tool joint has the advanced thread form, reasonable structure of shoulders, excellent torsion capacity, and reasonable stress distribution. It is helpful for the development of special thread drill pipe connection to meet the engineering acquirement.


Pan Y.,Shanghai University of Engineering Science | Qin L.,Shanghai University of Engineering Science | Qin L.,Shanghai Hilong Petroleum Tubular Goods Research Institute
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2016

Nonlinear finite element analysis was used in the ultimate bearing capacity on planar XX-joints by ANSYS software. The stress distributions of the joints were demonstrated, the main failure modes of the joints were determined, and the influences of some fundamental geometric parameters on the ultimate strength were the research points. The results show β (diameter ratio of the branch to the chord), θ (axial angle of the chord and the branch), γ (the ratio of the diameter of the chord to the thickness of the walls of the chord) are the main factors of the bearing capacity on planar XX-joints; the failure modes mostly belong to plastic failure of the walls of the chord; the computational formula of the bearing capacity on planar XX-joints is multiplied by a correction parameter based on the design formula of the bearing capacity on K-joints. © 2016, The Editorial Board of Journal of System Simulation. All right reserved.

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