本文選題：鉆桿螺紋接頭 + 密封性能　； 參考：《中國石油大學(華東)》2015年碩士論文

【摘要】：鉆桿是天然氣水合物深海鉆探取樣設(shè)備中的主要組成部分,其作用是傳遞扭矩和保護鉆桿內(nèi)部取樣鉆具。鉆桿通過螺紋接頭首尾相連,在取樣過程中受到拉、壓、彎、扭等載荷作用。由于鉆桿螺紋接頭截面形式變化較大,同時海底洋流的橫向作用,螺紋接頭在復(fù)合載荷作用下容易產(chǎn)生應(yīng)力集中,發(fā)生斷裂失效或密封失效。在此方面,國內(nèi)外學者對鉆桿接頭強度與密封性能已經(jīng)做了大量研究。本文針對深海鉆探取樣的特殊環(huán)境要求,在前人研究基礎(chǔ)上,對鉆探取樣鉆桿螺紋接頭進行了深入研究,并給出優(yōu)化后的結(jié)構(gòu)尺寸。首先介紹了國內(nèi)外鉆桿螺紋接頭受力的研究方法,并對其解析法進行了整理總結(jié)。然后,利用ABAQUS有限元分析軟件建立API接頭的軸對稱有限元模型,分析了接頭在上扣、拉伸、壓縮以及扭矩作用下的應(yīng)力分布規(guī)律,研究了應(yīng)力集中部位的應(yīng)力變化規(guī)律。同時研究了螺紋接頭的密封機理和密封性能,并對軸向力作用下螺紋接頭的密封性能做了研究和總結(jié)。最后,針對螺紋接頭的應(yīng)力集中現(xiàn)象,從螺紋擴錐孔尺寸、雙臺肩結(jié)構(gòu)和應(yīng)力減輕槽三個方面對結(jié)構(gòu)進行了逐步改進,并得到最佳優(yōu)化尺寸。通過有限元方法,對改進結(jié)構(gòu)的逐個對比分析表明,這些改進方案均不同程度的改善了螺紋接頭的應(yīng)力分布狀況,降低了危險區(qū)域的應(yīng)力集中,同時提高了螺紋接頭密封性能。利用前文的研究結(jié)果,對改進前后,單、雙臺肩結(jié)構(gòu)的接頭進行抗彎性能研究。通過對接頭三維完全模型的有限元分析,得到預(yù)緊扭矩和彎矩作用下螺紋接頭的應(yīng)力分布情況。并推導(dǎo)出了,雙臺肩結(jié)構(gòu)螺紋接頭彎矩承載能力的解析計算方法。研究表明雙臺肩結(jié)構(gòu)有效分擔了彎矩作用,減輕了螺紋接頭應(yīng)力集中狀況,提高了密封性能,使螺紋接頭能更好的適應(yīng)海底大彎矩要求。
[Abstract]:Drilling pipe is the main part of the sampling equipment for deep sea gas hydrate drilling. Its function is to transfer torque and protect the internal sampling drilling tool of drill pipe. The drill pipe is connected by threaded joints and subjected to tension, compression, bending and torsion during sampling. Due to the great variation of the cross section of the threaded joint of drill pipe and the transverse effect of ocean current on the bottom of the sea, the stress concentration of the threaded joint is easy to occur under the action of composite load, and the failure of fracture or seal occurs. In this respect, domestic and foreign scholars have done a lot of research on the strength and sealing performance of drill pipe joint. In accordance with the special environmental requirements of deep sea drilling sampling, this paper makes a thorough study on the threaded joint of drill pipe for drilling sampling on the basis of previous studies, and gives the optimized structure size. This paper introduces the research methods of drill pipe thread joint at home and abroad, and summarizes its analytical method. Then, the axisymmetric finite element model of API joint is established by using Abaqus finite element analysis software. The stress distribution of the joint under the action of buckle, tension, compression and torque is analyzed, and the stress variation law of the stress concentration is studied. At the same time, the sealing mechanism and sealing performance of thread joint are studied, and the sealing performance of thread joint under axial force is studied and summarized. Finally, aiming at the stress concentration phenomenon of the threaded joint, the structure is improved step by step from three aspects: the size of the screw expansion cone hole, the double shoulder structure and the stress relief groove, and the optimum size is obtained. Through the finite element method, the comparison and analysis of the improved structure show that these improved schemes improve the stress distribution of the threaded joints in varying degrees, reduce the stress concentration in the dangerous areas, and improve the sealing performance of the threaded joints at the same time. The flexural properties of the joints with single, double shoulder structure before and after the improvement are studied by using the previous research results. The stress distribution of threaded joints under the action of preload torque and bending moment is obtained by finite element analysis of 3D complete model of joints. The analytical calculation method of bending moment bearing capacity of thread joint with double shoulder structure is deduced. The research shows that the double shoulder structure can effectively share the bending moment, reduce the stress concentration of the threaded joint, improve the sealing performance, and make the threaded joint better adapt to the requirements of large submarine bending moment.
【學位授予單位】：中國石油大學(華東)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE951

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