海洋钻井平台压井管汇注乙二醇参数优化

Optimization of Glycol Injection Parameters of Kill Manifold on Offshore Drilling Platform

通过数值模拟,钻井管汇在放喷时具备天然气水合物形成条件,有可能堵塞节流阀,导致严重的事故。实验研究证明天然气水合物形成的概率会随着注入乙二醇体积分数而变化,以此为依据,绘制乙二醇的注入参数图版,保持在压井过程中管汇中的乙二醇体积分数预防水合物形成。对乙二醇体积分数对天然气水合物抑制效果进行实验研究,得到天然气井通过节流管汇进行放喷时的乙二醇推荐注入量,以及不同工况的注入参数、注入时机,避免管汇内达到天然气水合物的生产条件,保障井控安全。

Numerical simulation shows that the drilling manifold has the formation conditions of natural gas hydrate during blowout,which may block the throttle valve,resulting in loss of well control means and serious accidents.The experimental study shows that the probability of gas hydrate formation will change with the injected glycol concentration.Based on this,the injection parameter chart of ethylene glycol is drawn to keep the glycol concentration in the manifold during well killing to prevent hydrate formation.The experi⁃mental study on the inhibition effect of ethylene glycol concentration on natural gas hydrate was carried out.The recommended injec⁃tion amount of ethylene glycol,injection parameters and injection timing under different working conditions are obtained when the natu⁃ral gas well is blowout through the choke manifold,so as to avoid reaching the production conditions of natural gas hydrate formation in the manifold and ensure the safety of well control.