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Well control problems associated with gas solubility in oil-based drilling fluids.

機譯：與油基鉆井液中氣體溶解度有關(guān)的井控問題。

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摘要

Gas contamination of an oil-based drilling fluid during drilling operations, whether it be by the flow of formation gas into the wellbore (gas kick) or by the drilling of gas-bearing formations (drilled-gas), poses a potential hazard to the drilling equipment, environment, and personnel. This danger is the greatest when bottomhole conditions are such that the gas will completely dissolve into the drilling fluid and rapidly evolve as the gas-cut drilling fluid is circulated up the well.; This work summarizes a study of well control problems associated with gas solubility in oil-based drilling fluids. The solubilities of various gases (i.e., methane, ethane, carbon dioxide, etc.) in base oils used in oil-based drilling fluid preparation as well as an oil-based drilling fluid over a range of pressures and temperatures were measured and a method for predicting the solubility of a gas mixture containing methane, ethane, and carbon dioxide in an oil-based drilling fluid is presented. In addition, methods for predicting the pit gain to be expected for a given gas kick taken while drilling with an oil-based drilling fluid and for predicting the annular behavior to be expected when drilled-gas contaminates an oil-based drilling fluid during drilling were developed. Both methods were verified using data measured during experiments conducted in a 6000 ft test well.
機譯：鉆井操作過程中，油基鉆井液的氣體污染，無論是由于地層氣體流入井眼（氣井），還是由于對含氣地層進行鉆探（鉆井氣），都可能對鉆井造成潛在危害。鉆井設(shè)備，環(huán)境和人員。當(dāng)井底條件使得氣體將完全溶解到鉆井液中并隨著氣割鉆井液在井中循環(huán)時迅速放出時，這種危險最大。這項工作總結(jié)了對與油基鉆井液中氣體溶解度有關(guān)的井控問題的研究。測量了各種氣體（即甲烷，乙烷，二氧化碳等）在油基鉆井液制備中使用的基礎(chǔ)油以及油基鉆井液在一定壓力和溫度范圍內(nèi)的溶解度和方法提出了用于預(yù)測含甲烷，乙烷和二氧化碳的氣體混合物在油基鉆井液中的溶解度的方法。另外，用于預(yù)測在使用油基鉆井液進行鉆井時給定的氣井鉆進時預(yù)期的井坑增益以及用于在鉆井過程中當(dāng)鉆井氣體污染油基鉆井液時預(yù)測預(yù)期的環(huán)形行為的方法是發(fā)達。兩種方法均使用在6000英尺測試井中進行的實驗期間測得的數(shù)據(jù)進行了驗證。

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  • 作者

    O'Bryan, Patrick Leon.;

  • 作者單位

    Louisiana State University and Agricultural & Mechanical College.;

  • 授予單位 Louisiana State University and Agricultural & Mechanical College.;
  • 學(xué)科 Engineering Petroleum.
  • 學(xué)位 Ph.D.
  • 年度 1988
  • 頁碼 143 p.
  • 總頁數(shù) 143
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 石油、天然氣工業(yè);
  • 關(guān)鍵詞

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