本文選題：套管切割 + 偏心工況��； 參考：《中國海上油氣》2017年02期

【摘要】：套管切割是海洋平臺實(shí)施永久棄井時(shí)原井口裝置切割回收的最關(guān)鍵環(huán)節(jié),偏心工況切割套管時(shí)易形成不規(guī)則切口或?qū)е绿坠芪辞袛?造成刀片磨損嚴(yán)重、切割效率降低甚至導(dǎo)致井下事故。根據(jù)套管偏心切割受力模型,建立了切割面位置、割刀磨損長度及偏心切割扭矩的計(jì)算模型,并結(jié)合LH29-2-1井鐖339.725mm套管切割實(shí)例進(jìn)行了計(jì)算分析,結(jié)果表明:割刀磨損長度隨偏心距增大而增大;偏心工況時(shí)割刀切入套管各個方向的深度不一致,將導(dǎo)致套管切割作業(yè)失敗;偏心切割工況時(shí)3個割刀切割總扭矩波動較大,隨著切割的進(jìn)行,單個割刀切割扭矩變化逐漸趨近正弦曲線波形,切割總扭矩波動幅度逐漸減小并最終趨于直線。上述認(rèn)識可為判斷套管切割工況及切割結(jié)果提供指導(dǎo)。
[Abstract]:Casing cutting is the most important link of cutting and recovering the original wellhead device when the offshore platform is permanently abandoned. When cutting casing in eccentric condition, it is easy to form an irregular cut or lead to casing not being cut off, resulting in serious wear of the blade. Cutting efficiency decreases and even leads to downhole accidents. According to the stress model of eccentric casing cutting, the calculation models of cutting surface position, cutter wear length and eccentric cutting torque are established, and the calculation and analysis are carried out with the example of 339.725mm casing cutting in LH29-2-1 well. The results show that the wear length of the cutter increases with the increase of eccentricity, the depth of cutting into the casing is not consistent under eccentric conditions, which will lead to the failure of casing cutting, and the total torque of the three cutters fluctuates greatly under eccentric cutting conditions. With the development of cutting, the variation of cutting torque of single cutter approaches to the waveform of sinusoidal curve gradually, and the fluctuation amplitude of total torque decreases gradually and tends to be straight eventually. The above knowledge can provide guidance for judging casing cutting condition and cutting result.
【作者單位】： 長江大學(xué)機(jī)械工程學(xué)院;長江大學(xué)油氣鉆完井工具研究中心;
【基金】：國家自然科學(xué)基金“深水無隔水管鉆井渦動對鉆柱動態(tài)響應(yīng)研究(編號:51405032)” “十二五”國家科技重大專項(xiàng)“深水鉆井裝置安全作業(yè)與深水棄井工程應(yīng)用技術(shù)及測試分析(編號:2011ZX05026-001-04-05)”部分研究成果
【分類號】：TE952
，

本文編號：1810674