本文關(guān)鍵詞： 完井管柱 振動特性 固有頻率 動力響應(yīng) 現(xiàn)場實驗　出處：《西安石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：完井管柱是地層流體產(chǎn)出以及地面工作液注入產(chǎn)層的重要通道,流體流速和壓力的波動會誘發(fā)完井管柱的振動。管柱的受迫振動會造成管柱的疲勞破壞、磨損破壞,甚至在井下斷裂,研究完井管柱的振動特性對于確保完井管柱長期安全可靠工作有重大意義。本文首先分析了使完井管柱產(chǎn)生振動的內(nèi)部因素、外部因素及管柱內(nèi)部流固耦合機理,使用能量法及達(dá)朗伯原理分別建立了管柱橫向及縱向振動方程,利用分離變量法及邊界條件,求解振動方程并得到了管柱的固有頻率。接著,分析了封隔器約束、管柱尺寸、彈性模量、內(nèi)壓對完井管柱固有頻率的影響。然后,分析管柱在簡諧激勵下的動力響應(yīng),以管柱結(jié)構(gòu)圖及生產(chǎn)工況為分析依據(jù),以響應(yīng)應(yīng)力、響應(yīng)位移、響應(yīng)加速度為指標(biāo),橫向?qū)Ρ攘送昃苤痪畈煌r下的振動響應(yīng)情況,縱向?qū)Ρ攘送还r不同井深處的振動響應(yīng)情況。最后,根據(jù)管柱振動測試器在現(xiàn)場所測得的振動加速度數(shù)據(jù),以應(yīng)力為評價指標(biāo)分析了管柱在振動較為劇烈工況下的安全性。分析結(jié)果表明,完井管柱流固耦合振動固有頻率不但與管柱本身的抗彎剛度、質(zhì)量、尺寸有關(guān),還取決于流體的流速、密度、軸向力、跨距。對管柱施加封隔器約束,考慮內(nèi)壓,增加壁厚、外徑、彈性模量、盡可能減小管柱的長度都將有助于增大管柱的固有頻率,對抑制完井管柱的振動有積極作用。在本文分析的管柱結(jié)構(gòu)下,管柱系統(tǒng)中段的響應(yīng)應(yīng)力、響應(yīng)速度、響應(yīng)加速度最大,為整趟管柱中較為危險的部分。此外,在開關(guān)井作業(yè)時完井管柱的振動相較于其他工況更為劇烈,易發(fā)生共振,使管柱產(chǎn)生塑形變形,須引起施工方充分的重視。
[Abstract]:Completion string is an important channel for formation fluid production and surface working fluid injection. The vibration of completion string will be induced by the fluctuation of fluid velocity and pressure. The forced vibration of string will cause fatigue damage of string. It is very important to study the vibration characteristics of the completion string to ensure the safety and reliability of the completion string for a long time. This paper first analyzes the internal factors that cause the vibration of the completion string. The lateral and longitudinal vibration equations of pipe string were established by energy method and Dalmberg principle respectively. The separation variable method and boundary conditions were used. The vibration equation is solved and the natural frequency of the string is obtained. Then, the effects of Packer constraints, string size, elastic modulus and internal pressure on the natural frequency of the completion string are analyzed. The dynamic response of pipe string under simple harmonic excitation is analyzed according to the structure diagram of pipe string and production conditions and the response stress displacement and acceleration are taken as the index. The vibration response of the completion string under the same well depth and the different depth of the well under the same condition is compared horizontally. Finally, the vibration response of different well depths under the same working condition is compared. According to the vibration acceleration data measured by the string vibration tester in the field, the safety of the pipe string under the more intense vibration condition is analyzed with the stress as the evaluation index. The analysis results show that. The natural frequency of fluid-solid coupling vibration of the completion string is not only related to the bending stiffness, mass and size of the string itself, but also depends on the flow velocity, density, axial force and span. Considering the internal pressure, increasing the wall thickness, external diameter, elastic modulus and minimizing the length of the string will help to increase the natural frequency of the string. Under the string structure analyzed in this paper, the response stress, response speed and response acceleration of the middle section of the string system are the most dangerous part of the whole string. Compared with other working conditions, the vibration of the completion string in the switching well is more intense and resonant, which causes the tubing to be shaped and deformed, which should be paid more attention to by the construction side.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE925.3

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本文編號：1485083