螺纹黏结对圆螺纹套管连接强度的影响  

Effect by Galling on Connection Strength of Round-threaded Casing

作　　者：李兵 高连新[1] LI Bing;GAO Lianxin(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237

出　　处：《钢管》2021年第4期29-33,共5页Steel Pipe

摘　　要：针对油田广泛存在的油套管螺纹黏结问题,建立了套管圆螺纹的有限元模型,计算了上扣后接头内、外壁上的应变大小及分布规律,并与实测数据进行对比,验证了模型的可靠性;利用有限元模型研究了螺纹发生轻度、中度和严重黏结时,对接头连接强度的影响程度。结果发现:螺纹轻度黏结对接头连接影响不明显;中度黏结若发生在啮合螺纹的大端,会使连接强度降低5%左右;发生严重黏结时接头连接强度下降明显,若严重黏结位置位于啮合螺纹的大端连接强度下降约20%,若位于啮合螺纹的小端和中部连接强度下降6%~8%。Aiming at the problem of thread galling of the tubing and casing as popularly met in the oil field,a finite element model of the casing round thread is set up,and then used to find out the values and the distribution regularities of the strains on both the inner and outer surfaces of the after-make up coupling.And such data are compared with those as actually measured to verify reliability of the said FE model.Furthermore the FE model is employed to identify to what a extent the connection strength of the coupling is influenced in cases of slight,moderate and serious galling of the thread.As a result the facts as follows are revealed.For slight thread galling,the influence on the coupling connection is so little;for moderate thread galling,if it occurs on the big end of the engaged thread section,the connection strength is reduced by 5%;and in case of serious thread galling,the connection is obviously reduced,and specifically speaking,if such galling occurs on the big end of the engaged thread section,the connection strength is reduced by about 20%,and if it occurs on the small end or in the middle of the engaged thread section,the connection strength is just reduced by 6%~8%.

关 键 词：套管 圆螺纹 螺纹黏结 连接强度 有限元 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]