發(fā)布時(shí)間：2018-03-03 00:00

  本文選題：氣井　切入點(diǎn)：非API扣型　出處：《東北石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文針對(duì)氣井油管氣滲現(xiàn)象,重點(diǎn)關(guān)注氣井所使用的非API扣型油管的氣滲特性,并明確了公扣密封接觸面及扭矩臺(tái)肩側(cè)向密封面的所形成的微小泄漏通道是氣體逃逸的潛在通道。通過將粗糙表面數(shù)值化,并首先在不同工況下對(duì)非API扣型油管接箍進(jìn)行總體有限元數(shù)值模擬,確定公扣密封接觸面和扭矩臺(tái)肩側(cè)向密封接觸面的接觸面積及密封面處的接觸應(yīng)力大小;根據(jù)接觸面積及接觸應(yīng)力值進(jìn)行局部有限元求解,并基于局部有限元求解結(jié)果將最大法向應(yīng)力處自仿射放大,重復(fù)局部有限元求解過程,直至得到泄漏通道連通時(shí)的放大倍數(shù),并基于渝滲理論建立了泄漏率預(yù)測(cè)計(jì)算方法。根據(jù)氣井的實(shí)際工況,基于臨界放大倍數(shù)對(duì)泄漏率進(jìn)行求解。本文對(duì)油管泄漏率的研究主要是基于采氣區(qū)塊大量發(fā)生的環(huán)空帶壓現(xiàn)象,因此其最根本的研究目的便是環(huán)空帶壓診斷�；跉饩蓺夤苤鶜鉂B泄漏率計(jì)算模型,建立了氣滲引起的環(huán)空帶壓值預(yù)測(cè)模型。同時(shí)考慮到泄漏率本身處于動(dòng)態(tài)變化,因此對(duì)泄漏率計(jì)算模型進(jìn)行了修正,并提出了基于不同時(shí)間間隔的動(dòng)態(tài)環(huán)空帶壓模型,進(jìn)而為環(huán)空帶壓診斷提供了理論依據(jù)。同時(shí)基于室內(nèi)氣密封能力測(cè)試及實(shí)際采氣井驗(yàn)證了所建立模型的正確性。
[Abstract]:In this paper, the gas permeability characteristics of non-#en0# tubing used in gas wells are focused on the gas permeability phenomenon of gas well tubing. The tiny leakage channel formed by the contact surface of the common buckle seal and the lateral seal surface of the torque table shoulder is a potential channel for gas escape. At first, the general finite element numerical simulation of non-#en0# tubing coupling is carried out under different working conditions to determine the contact area and the contact stress of the contact surface between the common buckle seal surface and the torque table shoulder lateral seal surface. According to the contact area and contact stress value, the local finite element method is used to solve the problem. Based on the local finite element solution results, the maximum normal stress is amplified by self-affine amplification, and the local finite element solution process is repeated until the amplification multiple of the leakage channel is obtained. Based on the theory of Yu-permeability, the calculation method of leakage rate is established. According to the actual condition of gas well, In this paper, the leakage rate of tubing is mainly based on the phenomenon of annular zone pressure occurring in gas production blocks. Therefore, the most fundamental purpose of its research is to diagnose the annular zone pressure. Based on the calculation model of gas-permeability leakage rate of gas well gas production string, the prediction model of annular zone pressure caused by gas permeability is established. At the same time, considering the dynamic change of leakage rate itself, Therefore, the leakage rate calculation model is modified, and the dynamic annulus band pressure model based on different time intervals is proposed. It also provides a theoretical basis for the diagnosis of annular zone pressure, and validates the correctness of the model based on the test of indoor gas seal ability and the actual gas production 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】：2017
【分類號(hào)】：TE38

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