本文選題：取套管柱　切入點(diǎn)：取套能力　出處：《東北石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：定向井取套過程中,為提高取套管柱與套管的相容性,現(xiàn)場研制了軸套式套銑頭、軸套式扶正器和變向短接三種專用取套工具。但根據(jù)現(xiàn)場實(shí)踐,仍存在以下問題:(1)專用取套工具結(jié)構(gòu)缺少理論定量認(rèn)識(shí):過大或過小的變向短接彎曲角度會(huì)導(dǎo)致下切或上切套管,合理的變向短接彎曲角度取值缺乏理論定量計(jì)算;軸套內(nèi)套上的扶正塊與套管形成點(diǎn)接觸而使得套管承受較大的接觸應(yīng)力,需要對扶正塊的形狀、個(gè)數(shù)等參數(shù)進(jìn)行優(yōu)化設(shè)計(jì);(2)不同組配結(jié)構(gòu)管柱與套損井的適應(yīng)性不確定:組配有專用取套工具的工藝管柱在套損井中的極限取套深度、所適應(yīng)的套損井井斜角和井眼曲率缺少理論定量計(jì)算,給現(xiàn)場取套管柱的優(yōu)選帶來較大麻煩;(3)施工參數(shù)使用不合理:不合理鉆壓、排量的使用導(dǎo)致取套速度慢、憋壓等情況的發(fā)生,需要建立一套與取套管柱相匹配的施工參數(shù)方案。針對以上問題,本文在分析套管、扶正器、兩扶正器間套銑筒與井壁形成新接觸點(diǎn)以及變向短接存在對管柱軸向力傳遞影響的基礎(chǔ)上,建立了表征取套管柱與套管相容性程度的變向力計(jì)算模型,通過對套銑筒-扶正塊-套管組合接觸應(yīng)力的數(shù)值模擬,實(shí)現(xiàn)了確保套管不發(fā)生屈服破壞的變向短接彎曲角度優(yōu)化設(shè)計(jì)。從扶正塊與套管形成面接觸進(jìn)而減小套管所受接觸應(yīng)力的角度,提出弧形扶正塊的構(gòu)想,并依據(jù)變向力大小,進(jìn)行了弧形扶正塊弧形面積、弧長和對應(yīng)圓心角的設(shè)計(jì);同時(shí),從扶正塊存在能夠減小修井液過流斷面進(jìn)而增加其噴出速度有利于提高井底巖屑的運(yùn)移效率角度,通過數(shù)值模擬,分析了扶正塊寬度和高度對修井液流速的影響程度,優(yōu)化了扶正塊高度和寬度。通過建立套管不發(fā)生屈服破壞條件下取套管柱極限深度計(jì)算模型,得出一套不同組配結(jié)構(gòu)取套管柱所適應(yīng)的套損井極限取套深度、井斜角和井眼曲率合理取值范圍。在對定向井取套鉆壓、扭矩、排量和鉆速計(jì)算模型研究的基礎(chǔ)上,形成了一套與取套管柱相匹配的鉆壓、扭矩、鉆速、排量施工參數(shù)方案。研究結(jié)果為定向井取套管柱的優(yōu)選提供了重要的理論指導(dǎo),對定向井安全取套作業(yè)的順利實(shí)施具有重要意義。
[Abstract]:The set of directional wells in the process, in order to improve the compatibility of the casing and the casing, the site developed a sleeve type milling head, sleeve type centralizer and change to the short circuit of three special set of tools. But according to the practice, still exist in the following problems: (1) the lack of special set of tools structure theory quantitative understanding: too big or too small to short the bending angle will lead to cut or cut casing, reasonable to short the bending angle values of the lack of theoretical calculation; the internal sleeve, sleeve centralizer block and the casing and the casing form point contact under high contact stress, the need for centralized block the shape optimization design of a number of parameters; (2) matched string structure and casing adaptability uncertainty: group with special tool set of process pipe column in the limit of casing damage wells set depth, to adapt to the casing damage wells angle and curvature of wellbore lack theory The amount of calculation, preferably to take the field of casing in greater trouble; (3) the use of unreasonable construction parameters: unreasonable drilling pressure, displacement to set speed, pressure and other situations, the need to establish a set of matching and casing construction parameters. To solve the above problems, this paper in the analysis of casing centralizer, the formation of a new point of contact and change to the short existence on the basis of the influence of axial force on the tube mill sleeve and shaft two centralizer, established by taking casing and casing compatibility degree calculation model to force through the milling cylinder - block - centralizer numerical simulation of the contact stress of the casing, the casing does not occur to ensure the yield to the short circuit bending angle optimization design. From the centralizing block and casing surface contact and thus reduce the casing by contact stress angle, put forward the conception of arc stabilizing block, and according to the According to the turning force, the arc stabilizing block arc area, the arc length and the design of the central angle; at the same time, from the existing centralizer block can reduce workover fluid flow section in order to increase the jet velocity is beneficial to improve the efficiency of cuttings migration angle, through numerical simulation, analysis of the width and height of the centralizing block workover fluid flow influence degree, optimize the centralizing block height and width. Through the establishment of casing yield failure condition of calculating limit of casing depth, obtains a set of different combining structure of casing to casing damage wells taking limit set depth, inclination angle and curvature of wellbore reasonable range. In the directional wells set torque, drilling pressure, displacement and drilling speed calculation model based on the study of the formation of a drill press, and matching of casing drilling speed, torque, displacement parameters of construction scheme. The results for directional wells The optimization of the casing string provides important theoretical guidance, which is of great significance to the smooth implementation of the safe operation of the directional well.

【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE92

【共引文獻(xiàn)】

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