Simulation of gas kick with high H₂S content in deep well

详细信息    查看全文

• 作者：Bao-jiang SUN (Ëﱦ½­) ^{sunbj1128@126.com}Author Vitae ; Pei-bin GONG (¹«Åà±ó) ; Zhi-yuan WANG (ÍõÖ¾Ô¶)
• 关键词：hydrogen sulphide ; supercritical condition ; solubility ; well control ; multiphase flow
• 刊名：Journal of Hydrodynamics, Ser. B
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：25
• 期：2
• 页码：264-273
• 全文大小：1410 K

文摘

The phase transition, from a subcritical state to a gaseous state, of the natural gas with high H₂S content and the solubility of the H₂S component in the drilling fluid will make the multiphase flow behavior very different from the pure natural gas-drilling fluid two-phase flow under the gas kick condition in a deep well. With consideration of the phase transition and the solubility of the H₂S component in the natural gas, a multiphase flow model is established. The simulation analysis results indicate that, for a typical case of a well depth of 4 325 m, the density of the 100 % -H₂S natural gas can be 4 times higher than that of the 0 % -H₂S natural gas, and the solubility of the 100 % -H₂S natural gas is 130 times higher than that of the 0 % -H₂S natural gas. These will make the detection of the gas invasion more difficult. While the invasion gas moves up along the wellbore to a certain position, the phase transition and the release of the dissolved gas may cause a rapid volume expansion, increasing the blowout risk. The calculation results also show that the risks of a gas kick can be reduced by increasing the wellhead back pressure.