P110油管与BG140套管的往复摩擦磨损研究及管柱完整性评价

发布时间：2018-02-15 06:38

本文关键词： 油管套管磨损效率强度分析　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：在采油工程中,油管属于超细长杆管柱,在轴向的压力下会产生屈曲,并且由于受到井眼轨迹、油管与套管柱自重和施加载荷的影响,通常会使油管和套管产生随机接触和摩擦,出现往复摩擦磨损。致使管壁局部壁厚减薄,壁厚减薄的管柱抗内压和抗外压能力降低,从而影响管柱安全使用。目前国内对于油管屈曲与套管产生轴向的摩擦磨损方面的研究非常少。本文采用往复式油管-套管磨损实验机进行油管-套管的磨损实验,确定BG140套管和P110油管之间的磨损效率和摩擦系数,使用失重法测出套管的磨损量。利用磨损套管的月牙形模型计算得到磨损深度,结合有限元软件计算磨损套管的强度。实验表明随着正压力的增大,P110油管对BG140套管造成的磨损失重量增大。随着摩擦频率的增大,P110油管对BG140套管造成的磨损失重量也增大。在相同密度1.2g/cm3的水基环空保护液介质环境和有机盐环空保护液介质环境中,正压力和摩擦频率保持不变,相同时长内P110油管对BG140套管的磨损程度和磨损效率在前者介质环境中远远大于后者。利用White的磨损-效率模型以及通过实验确定的磨损效率,计算得到磨损实际时间、磨损截面面积、套管接触力等参数,最终得到套管磨损最大深度在水基环空液和有机盐环空液介质中分别为0.19和0.52mm。利用ANSYS软件分别计算两种介质环境中的磨损套管的强度得知,磨损套管的最大应力均产生在套管内部与油管接触面形成的月牙型凹槽。水基环空保护液介质环境中磨损套管的最大应力为235MPa,有机盐环空保护液介质中磨损套管的最大应力为216MPa。二者的最大应力处均远远小于BG140套管材料的许用应力。综上所述,在两种介质环境中的套管均能保证井下管柱完整,进行安全生产。
[Abstract]:In the oil production project, the tubing belongs to the super slender rod string, which will be buckled under axial pressure, and it will be affected by the hole trajectory, the weight of tubing and casing string and the application of load. In general, the tubing and the casing will be subjected to random contact and friction, and reciprocating friction and wear will occur, resulting in the reduction of the local wall thickness of the pipe and the decrease of the resistance to internal and external pressure of the pipe string with the thinning of the wall thickness. At present, there are few researches on friction and wear of tubing buckling and casing. In this paper, a reciprocating tube-casing wear tester is used to test the wear of tubing and casing. The wear efficiency and friction coefficient between the BG140 casing and the P110 tubing are determined, and the wear amount of the casing is measured by using the weightlessness method. The wear depth is calculated by using the crescent model of the worn casing. The strength of wear casing is calculated with finite element software. The experimental results show that the wear weight loss caused by P110 tubing to BG140 casing increases with the increase of positive pressure, and the weight loss caused by P110 tubing on BG140 casing increases with the increase of friction frequency. At the same density of 1.2 g / cm ~ 3, in the water base ring space protection medium environment and the organic salt ring space protecting liquid medium environment, The positive pressure and friction frequency remain constant, and the wear degree and wear efficiency of P110 tubing to BG140 casing in the same time are much higher than that of the latter in the former medium. The wear efficiency is determined by using White's wear-efficiency model and experiments. The actual wear time, wear cross section area, casing contact force and other parameters are calculated. Finally, the maximum wear depth of casing in water-based annular fluid and organic salt annular liquid medium is 0.19 and 0.52 mm. the strength of wear casing in two media environments is calculated by ANSYS software. The maximum stress of the wear casing is the crescent groove formed by the contact surface between the casing and the tubing. The maximum stress of the worn casing is 235 MPA in the water base annulus protection medium, and the wear casing is in the organic salt annulus protective fluid medium. The maximum stress of both is much smaller than the allowable stress of BG140 casing material. The casing in both media environment can ensure the integrity of downhole tubing string and safe production.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2

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