【摘要】：連續(xù)油管在油氣作業(yè)中的應(yīng)用越來越廣泛,每年世界范圍內(nèi)連續(xù)油管用量近500萬米。服役過程中承受腐蝕介質(zhì)的作用,極易造成腐蝕坑等缺陷,而且承受拉伸、彎曲等復雜載荷的作用,在腐蝕坑處形成裂紋或開裂,從而導致失效。因此建立含腐蝕缺陷連續(xù)油管的強度評價方法、提出連續(xù)油管的極限腐蝕坑尺寸,是保證連續(xù)油管安全作業(yè)所急需解決的問題。本文以克深井作業(yè)的QT900鋼級、Ф38.1mm×5.16mm、含腐蝕坑的連續(xù)油管作為研究對象,以API 579的相關(guān)條款為依據(jù),采用理論分析、數(shù)值模擬的方法研究了連續(xù)油管在內(nèi)壓、彎曲、重力等載荷作用下的強度特征,明確了腐蝕坑對連續(xù)油管強度的影響規(guī)律,提出了極限腐蝕坑深度、剩余強度的指標,為該井區(qū)工作的含腐蝕坑連續(xù)油管的安全評價提供了理論基礎(chǔ)和評價指標,為其他的井區(qū)工作的連續(xù)油管的安全評價提供了參考。研究結(jié)果表明:QT900連續(xù)油管作業(yè)過程中的腐蝕現(xiàn)象以點狀腐蝕坑為主;腐蝕坑深度越大、密度越高,剩余強度越低。二級評價方法評價精度略高于1級評價方法,20MPa內(nèi)壓作用下極限腐蝕坑深度為4.13mm;三級評價的結(jié)果說明當連續(xù)油管受到439MPa拉伸載荷時,腐蝕坑的極限深度小于0.005mm;當連續(xù)油管的彎曲半徑為1219.2mm、1257.3mm和1447.8mm時,極限腐蝕坑深度分別為0.516mm、1.032mm和1.548mm;連續(xù)油管下井過程中最危險的位置為管體經(jīng)過導向架時由直變彎的過程,此過程中在439MPa拉伸載荷作用下,經(jīng)過半徑為1828mm的彎曲時,極限腐蝕坑深度介于0.516mm與0.774mm之間。
[Abstract]:The application of coiled tubing in oil and gas operation is more and more extensive, and the amount of coiled tubing is nearly 5 million meters in the world every year. It is easy to cause the defects such as corrosion pits and other defects in the service process by the role of corrosion medium. Moreover, the effect of complex loads, such as tensile and bending, causes cracks or cracks in the corrosion pits, which lead to failure. Therefore, it is urgent to establish the strength evaluation method of continuous tubing with corrosion defects and to put forward the limit corrosion pit size of continuous tubing to ensure the safe operation of coiled tubing. In this paper, the QT900 steel grade, 38.1mm 脳 5.16mm, corrosion pit containing continuous tubing is used as the research object. Based on the relevant articles of API 579, the internal pressure and bending of the coiled tubing are studied by theoretical analysis and numerical simulation. The characteristics of strength under the action of equal gravity load, the influence law of corrosion pit on the strength of continuous tubing is clarified, and the index of limit corrosion pit depth and residual strength is put forward. It provides a theoretical basis and evaluation index for the safety evaluation of the continuous tubing with corrosion pit working in the well area, and provides a reference for the safety evaluation of the continuous tubing working in the other well areas. The results show that the corrosion phenomenon of the 1: QT900 continuous tubing is mainly the point corrosion pit, the deeper the corrosion pit is, the higher the density is, and the lower the residual strength is. The evaluation accuracy of the second grade evaluation method is slightly higher than that of the first grade evaluation method. The ultimate corrosion pit depth is 4.13mm under the action of internal pressure of 20MPa. The result of the third grade evaluation shows that when the continuous tubing is subjected to the 439MPa tensile load, The ultimate depth of the corrosion pit is less than 0.005mm; when the bending radius of the continuous tubing is 1219.2mm / 1257.3mm and 1447.8mm, the ultimate corrosion pit depth is 0.516mm / 1.032mm and 1.548mm respectively. In this process, under the action of 439MPa tensile load, the ultimate corrosion pit depth is between 0.516mm and 0.774mm when the radius is 1828mm bending.
【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】：TE983

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本文編號：2144266