【摘要】：在實(shí)際生產(chǎn)中完井封隔器有時(shí)會(huì)發(fā)生卡瓦牙斷裂、卡瓦對套管過度損壞、膠筒破損脫落等導(dǎo)致封隔器封隔失效的安全事故。因此本文以THT完井封隔器為研究對象,針對封隔器卡瓦和膠筒進(jìn)行分析研究。文中采用理論研究和有限元模擬兩種方法對封隔器卡瓦和膠筒進(jìn)行分析。根據(jù)靜力學(xué)理論分析卡瓦坐封后應(yīng)力狀態(tài),得到卡瓦牙的接觸應(yīng)力公式;運(yùn)用有限元軟件模擬卡瓦坐封過程,有限元分析結(jié)果顯示:卡瓦與套管接觸應(yīng)力沿軸向和環(huán)向分布均不均勻,卡瓦牙發(fā)生塑性變形;由卡瓦接觸應(yīng)力影響因素有限元分析結(jié)果可知,卡瓦牙頂角α在75°—80°,牙傾角β在65°—70°,卡瓦楔形角γ在10°—15°時(shí)卡瓦接觸應(yīng)力狀態(tài)最優(yōu)。同理,運(yùn)用材料力學(xué)和彈塑性力學(xué)相關(guān)理論求得了膠筒在自由變形階段和約束變形階段的應(yīng)力狀態(tài),推導(dǎo)出膠筒在此兩階段下的壓縮量公式以及接觸應(yīng)力公式;運(yùn)用有限元軟件對膠筒進(jìn)行數(shù)值模擬,得到膠筒接觸應(yīng)力分布規(guī)律:接觸應(yīng)力沿軸向分布不均勻,上膠筒最大,下膠筒最小;由膠筒接觸應(yīng)力因素有限元分析結(jié)果可知,膠筒接觸面傾角在75°-80°,膠筒高度選擇端膠筒40—50mm,中間膠筒50—60mm的組合方式,加載方式選取雙向加載時(shí)膠筒接觸應(yīng)力狀態(tài)最優(yōu)。
[Abstract]:In the actual production, the seal failure of the Packer will sometimes occur, such as the excessive damage to the casing and the breakage and shedding of the rubber cylinder, which will lead to the failure of the Packer sealing. Therefore, this paper takes THT completion Packer as the research object, and analyzes and studies the Packer pad and rubber cylinder. In this paper, theoretical research and finite element simulation are used to analyze the Packer tile and rubber cylinder. According to the statics theory, the stress state of kava after sealing is analyzed, and the contact stress formula of kava teeth is obtained. The finite element software is used to simulate the sealing process of the kava. The results of finite element analysis show that the contact stress between the kava and the casing is uneven along the axial and circumferential direction, and the plastic deformation of the kava teeth occurs. According to the finite element analysis of the influencing factors of kava contact stress, it can be seen that the contact stress state of kava tooth is the best when the top angle 偽 is 75 擄- 80 擄, the inclination angle 尾 is 65 擄- 70 擄, and the kava cuneiform angle is 10 擄- 15 擄. In the same way, the stress state of the rubber tube in the free deformation stage and the constrained deformation stage is obtained by using the related theories of material mechanics and elastic-plastic mechanics, and the compression quantity formula and the contact stress formula of the rubber tube under these two stages are derived. The finite element software is used to simulate the rubber tube, and the distribution law of contact stress is obtained: the contact stress distribution is uneven along the axial direction, the upper rubber tube is the largest, and the lower rubber tube is the smallest; According to the finite element analysis results of the contact stress factors of the rubber tube, it can be seen that the inclination angle of the contact surface of the rubber tube is 75 擄- 80 擄, and the height of the rubber tube is 40-50 mm at the end of the rubber tube, and the combination mode of the middle rubber tube 50-60mm is selected. When the loading mode is bi-directional loading, the contact stress state of the rubber cylinder is the best.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE925.3

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