本文關(guān)鍵詞： 套管 密封 檢測裝置 外壓 設(shè)計　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：現(xiàn)場油氣田套管柱密封泄漏現(xiàn)象不僅對后續(xù)施工影響巨大,對環(huán)境和社會都會造成巨大的安全隱患。套管從合格出廠到下套管的過程中,可能會因為作業(yè)過程中的磕碰、員工的操作方式不當、連接扣和密封面的清潔程度不佳等因素影響套管連接的密封性。因此,在下套管過程中逐根對套管進行在線氣密封檢測是確保套管連接密封性的直接且有效的手段。現(xiàn)場已有部分油氣井運用內(nèi)壓檢測套管螺紋密封性裝置對螺紋的密封性能進行在線檢測,但內(nèi)壓檢測裝置在使用過程中仍然存在一些問題,包括檢測操作不便、不利于進行小管徑套管檢測和可能出現(xiàn)落魚現(xiàn)象等等。根據(jù)現(xiàn)場需求,針對內(nèi)壓檢測裝置的不足,本文提出了一種外壓檢測套管螺紋密封性能的方法,并完成了對裝置的設(shè)計工作。 本文的研究工作主要包括以下幾個方面： (1)針對現(xiàn)場內(nèi)壓檢測套管螺紋密封性裝置在實際運用中存在的不足,提出了外壓檢測套管螺紋密封性的方法。 (2)研究常用套管螺紋的密封形式和密封機理,利用有限元仿真模擬內(nèi)壓和外壓檢測套管螺紋連接密封性的過程,分析內(nèi)壓和外壓檢測過程對套管密封部位的等效應(yīng)力和接觸應(yīng)力的影響,作出了外壓檢測套管螺紋密封性裝置是可行的結(jié)論。 (3)根據(jù)外壓檢測裝置所處工況和需要實現(xiàn)的功能,借鑒井控設(shè)備中成熟的防噴器原理,通過對密封性檢測方式和裝置抱緊方式的選擇完成了對外壓檢測套管螺紋密封性裝置的結(jié)構(gòu)設(shè)計。 (4)對裝置中的橡膠密封材料完成單向拉伸和單向壓縮實驗,對實驗數(shù)據(jù)擬合Mooney-Rivlin本構(gòu)模型、Ogden本構(gòu)模型和Yeoh本構(gòu)模型,最終判定Yeoh本構(gòu)模型的擬合結(jié)果能夠更好地反應(yīng)所選橡膠材料的力學(xué)特性。 (5)通過對密封結(jié)構(gòu)重要參數(shù)的理論研究,完成對密封膠芯的結(jié)構(gòu)設(shè)計。依靠有限元仿真手段,分析討論偏心距e、半徑差△、墊鐵內(nèi)弧面偏心距et和墊鐵外圓弧半徑R2對密封效果的影響,并選擇針對本裝置密封膠芯的較優(yōu)尺寸參數(shù)。 (6)完成對液壓缸的結(jié)構(gòu)設(shè)計和液壓控制系統(tǒng)的設(shè)計,校核承壓部件外殼強度,優(yōu)化外殼的結(jié)構(gòu)尺寸。
[Abstract]:The leakage phenomenon of casing string seal in field oil and gas field will not only have a great impact on the subsequent construction, but will also cause huge safety risks to the environment and society. Improper operation of employees, poor cleanliness of connection buckle and sealing face and other factors affect the sealing of casing connection. On-line gas seal detection is a direct and effective means to ensure casing connection sealing in the process of casing down-casing. Some oil and gas wells have used internal pressure to detect casing thread sealing device for thread density. Seal performance online testing, However, there are still some problems in the use of the internal pressure detection device, including the inconvenient operation of the test, which is not conducive to the detection of small pipe diameter casing and the possibility of falling fish, etc. According to the requirements of the field, the defects of the internal pressure detecting device are pointed out. In this paper, a method of testing casing thread sealing performance by external pressure is presented, and the design of the device is completed. The research work of this paper mainly includes the following aspects:. 1) in view of the deficiency of in-situ pressure testing casing thread sealing device in practical application, the method of external pressure testing casing thread sealing property is put forward. The sealing form and sealing mechanism of common casing thread are studied, and the process of testing the sealing property of casing thread connection is simulated by finite element simulation. The influence of internal pressure and external pressure on the equivalent stress and contact stress of casing sealing position is analyzed. The conclusion is made that it is feasible to detect casing thread sealing device by external pressure. According to the working condition and the function that need to be realized, the principle of blowout preventer, which is mature in well control equipment, is used for reference. The structural design of the casing thread sealing device for external pressure testing is completed by selecting the sealing test mode and the device holding mode. (4) uniaxial tensile and uniaxial compression experiments were carried out on rubber sealing materials in the plant. The Mooney-Rivlin constitutive model and the Yeoh constitutive model were fitted to the experimental data. Finally, the fitting results of Yeoh constitutive model can better reflect the mechanical properties of the selected rubber materials. Through the theoretical research on the important parameters of sealing structure, the structural design of sealant core is completed. By means of finite element simulation, the eccentricity and radius difference are analyzed and discussed. The influence of inner arc eccentricity et and outer arc radius R2 of cushion iron on sealing effect was studied and the optimum size parameters of sealing core were selected. The structure design of hydraulic cylinder and the design of hydraulic control system are completed. The strength of the shell of the pressure bearing parts is checked and the structural dimensions of the shell are optimized.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE931.2

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