發(fā)布時間：2018-05-15 05:02

  本文選題：井下油水分離 + 力學分析　； 參考：《東北石油大學》2017年碩士論文

【摘要】：井下油水分離系統(tǒng)因具有結構緊湊、運行空間小、分離時間短等優(yōu)點,正逐步成為國內外各大石油企業(yè)所采用的油田開采技術。本文簡要介紹了井下油水分離系統(tǒng)的研究進展以及管柱面臨的技術難點,結合我國高含水油田、小尺寸采油套管的開采現(xiàn)狀,提出了一種新型的井下油水分離系統(tǒng)。本文選取具體使用工況下的同井注采井下管柱為研究對象,對井下油水分離系統(tǒng)進行設計研究,包括油水分離分系統(tǒng)設計、動力分系統(tǒng)設計、采出層與注入層封隔工藝技術,并對其進行室內試驗研究;在綜合考慮同井注采工藝流程和多項影響因素的基礎上,建立井下油水分離管柱的力學模型,通過計算管柱核心部分的受力和變形情況,分析得出井下分離管柱的載荷,并對井下分離管柱進行有限元建模及理論分析;依據(jù)井下分離管柱的工程實際,開展了井下分離管柱的模態(tài)分析,根據(jù)得出的固有頻率和振型預測了管柱的實際振動響應和結構設計的薄弱部位;然后開展了螺桿泵周期性偏心載荷作用下的管柱諧響應分析,得出其位移響應曲線,獲得了井下分離管柱結構位移等力學參數(shù)隨頻率的變化規(guī)律;進行了管柱工作過程中電機啟停下的瞬態(tài)動力學分析,得出管柱的位移動態(tài)響應規(guī)律和應力、變形的分布。結合管柱力學分析結果,對井下分離管柱中的旋流分離器上端連接部件和止推機構底軸等關鍵部件進行極限載荷計算,及實際載荷作用下的結構強度評價,進而對關鍵部件進行結構優(yōu)化;并根據(jù)脫接器現(xiàn)有問題,進行了分析優(yōu)選,保證了同井注采管柱長期運行過程中的可靠性。
[Abstract]:Due to the advantages of compact structure, small operation space and short separation time, the downhole oil-water separation system is gradually becoming the oilfield production technology adopted by large oil enterprises at home and abroad. This paper briefly introduces the research progress of downhole oil-water separation system and the technical difficulties faced by tubing string, and puts forward a new downhole oil-water separation system combined with the present situation of production of small size casing in high water-cut oil field in China. In this paper, the downhole tubing string in the same well is selected as the research object, and the downhole oil-water separation system is designed and studied, including the design of oil-water separation subsystem, the design of power subsystem, and the sealing technology of the produced and injected layers. The mechanical model of downhole oil-water separation string is established on the basis of comprehensive consideration of the same well injection and production process and many influencing factors, and the stress and deformation of the core part of the string are calculated. The load of the downhole separation string is obtained, and the finite element modeling and theoretical analysis of the downhole separation string are carried out, and the modal analysis of the downhole separation string is carried out according to the engineering practice of the downhole separation string. According to the natural frequencies and modes obtained, the actual vibration response of the pipe string and the weak part of the structural design are predicted, and then the harmonic response analysis of the pipe cylinder under the periodic eccentric load of the screw pump is carried out, and the displacement response curve is obtained. The variation law of mechanical parameters such as structural displacement of underground separation string with frequency is obtained, and the transient dynamic analysis of motor start and stop during the working process of string is carried out, and the dynamic response law of displacement and the distribution of stress and deformation of string are obtained. Combined with the results of mechanical analysis of pipe string, the ultimate load of the upper end connecting parts of cyclone separator and the bottom shaft of thrust mechanism in the downhole separation string are calculated, and the structural strength under actual load is evaluated. Then the structure of the key components is optimized and the reliability of the injection and production string in the same well is ensured by analyzing and selecting according to the existing problems of the detacer.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE931.2

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