本文關鍵詞： 油管 套管 磨損效率 強度分析　出處：《西安石油大學》2015年碩士論文　論文類型：學位論文

【摘要】：在采油工程中,油管屬于超細長桿管柱,在軸向的壓力下會產生屈曲,并且由于受到井眼軌跡、油管與套管柱自重和施加載荷的影響,通常會使油管和套管產生隨機接觸和摩擦,出現(xiàn)往復摩擦磨損。致使管壁局部壁厚減薄,壁厚減薄的管柱抗內壓和抗外壓能力降低,從而影響管柱安全使用。目前國內對于油管屈曲與套管產生軸向的摩擦磨損方面的研究非常少。本文采用往復式油管-套管磨損實驗機進行油管-套管的磨損實驗,確定BG140套管和P110油管之間的磨損效率和摩擦系數(shù),使用失重法測出套管的磨損量。利用磨損套管的月牙形模型計算得到磨損深度,結合有限元軟件計算磨損套管的強度。實驗表明隨著正壓力的增大,P110油管對BG140套管造成的磨損失重量增大。隨著摩擦頻率的增大,P110油管對BG140套管造成的磨損失重量也增大。在相同密度1.2g/cm3的水基環(huán)空保護液介質環(huán)境和有機鹽環(huán)空保護液介質環(huán)境中,正壓力和摩擦頻率保持不變,相同時長內P110油管對BG140套管的磨損程度和磨損效率在前者介質環(huán)境中遠遠大于后者。利用White的磨損-效率模型以及通過實驗確定的磨損效率,計算得到磨損實際時間、磨損截面面積、套管接觸力等參數(shù),最終得到套管磨損最大深度在水基環(huán)空液和有機鹽環(huán)空液介質中分別為0.19和0.52mm。利用ANSYS軟件分別計算兩種介質環(huán)境中的磨損套管的強度得知,磨損套管的最大應力均產生在套管內部與油管接觸面形成的月牙型凹槽。水基環(huán)空保護液介質環(huán)境中磨損套管的最大應力為235MPa,有機鹽環(huán)空保護液介質中磨損套管的最大應力為216MPa。二者的最大應力處均遠遠小于BG140套管材料的許用應力。綜上所述,在兩種介質環(huán)境中的套管均能保證井下管柱完整,進行安全生產。
[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.
【學位授予單位】：西安石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE931.2

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