發(fā)布時(shí)間：2018-09-09 13:46

【摘要】：深水鉆井尤其是深水高壓氣層鉆井過(guò)程的井筒壓力控制是關(guān)系到鉆井安全的關(guān)鍵之一。準(zhǔn)確掌握鉆進(jìn)和壓井過(guò)程中由于氣侵引起的井筒內(nèi)壓力變化規(guī)律、氣體上升及體積變化規(guī)律、井口溢流量增長(zhǎng)規(guī)律,及時(shí)評(píng)價(jià)不同地層和施工條件下的井控風(fēng)險(xiǎn)及風(fēng)險(xiǎn)強(qiáng)度,對(duì)制定合理井控風(fēng)險(xiǎn)防范和壓井施工措施具有重要意義。本論文針對(duì)深水鉆井氣侵井控風(fēng)險(xiǎn)評(píng)價(jià)問(wèn)題,在系統(tǒng)調(diào)研鉆井和井控過(guò)程中井筒溫度、壓力計(jì)算方法以及風(fēng)險(xiǎn)評(píng)價(jià)方法研究進(jìn)展和成果的基礎(chǔ)上,通過(guò)理論分析,建立了深水鉆井和氣侵井控過(guò)程中井筒內(nèi)溫度和壓力的計(jì)算模型,分析了鉆進(jìn)氣侵溢流過(guò)程中井底壓力、泥漿池增量、溢流發(fā)現(xiàn)時(shí)間的變化規(guī)律,研究了不同氣層特點(diǎn)和壓井參數(shù)條件下壓井過(guò)程中套管壓力的變化特征。依據(jù)井口裝置承壓能力、套管抗內(nèi)壓能力和地層破裂壓力條件,建立了區(qū)分井控風(fēng)險(xiǎn)“安全、相對(duì)危險(xiǎn)和危險(xiǎn)”的3個(gè)級(jí)別的判別方法。并應(yīng)用南海東部NH3-2井的鉆井資料對(duì)該井進(jìn)行了井控風(fēng)險(xiǎn)分析。研究結(jié)果表明,地層滲透率、井底壓差、溢流發(fā)現(xiàn)時(shí)間、泥漿池增量等是影響井控難度的主要因素。對(duì)NH3-2井,溢流量控制在0.6m3以內(nèi)為安全區(qū),溢流量在0.6m3到8.4m3之間為相對(duì)危險(xiǎn)區(qū),溢流量超過(guò)8.4m3為危險(xiǎn)區(qū)。研究成果為深水鉆井氣侵井控難度的預(yù)測(cè)和溢流報(bào)警限的合理確定以及壓井措施的制定提供了手段。
[Abstract]:Well bore pressure control in deep water drilling, especially in deep water high pressure gas formation, is one of the key factors related to drilling safety. In order to evaluate the well control risk and risk intensity under different formation and construction conditions, we can accurately grasp the law of wellbore pressure change, gas rise and volume change, well overflow flow growth, and well control risk and risk intensity under different formation and construction conditions caused by gas invasion during drilling and well killing. It is of great significance to make reasonable well control risk prevention and well-killing measures. In this paper, aiming at the risk evaluation of gas invasion control in deep water drilling, on the basis of systematic investigation and research on wellbore temperature, pressure calculation method and risk assessment method during drilling and well control, theoretical analysis is carried out. The calculation model of wellbore temperature and pressure during deep water drilling and gas invasion control is established, and the variation law of bottom hole pressure, mud pool increment and overflow discovery time during drilling gas invasion overflow is analyzed. The variation characteristics of casing pressure in the process of well-killing under different gas reservoir characteristics and well-killing parameters are studied. According to the pressure bearing capacity of wellhead device, casing resistance to internal pressure and formation fracture pressure condition, three levels of distinguishing well control risk "safety, relative danger and danger" are established. Well control risk analysis of NH3-2 well in the east of South China Sea is carried out. The results show that formation permeability, bottom hole pressure difference, overflow discovery time and mud pool increment are the main factors affecting the difficulty of well control. For NH3-2 well, the overflow flow is controlled within 0.6m3 as a safe area, the overflow flow between 0.6m3 and 8.4m3 is a relative dangerous area, and the overflow amount exceeds 8.4m3 as a dangerous area. The research results provide a means for predicting the difficulty of gas invasion control in deep water drilling, reasonably determining the limit of overflow alarm and making the measures of well killing.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE52

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本文編號(hào)：2232560