海洋石油钻井平台工程地质条件评价技术研究

海洋石油钻井平台是海洋油气勘探开发的重要手段,其安全就位和稳定施工,与井场区海底的工程地质条件密切相关。就事关平台安全的工程地质条件预测评价技术作了研究,评价预测了与自升式钻井平台稳定作业有关的软弱下卧地层的穿插和持力、海底斜坡条件下工程地质层稳定性、半潜式钻井平台的锚固力以及不同底质条件下海底底流的冲蚀。推荐了实践有效的半经验计算公式,为海洋石油钻井平台井场工程地质条件的稳定评价提供参考。

Evaluation researches of engineering geological condition of offshore oil drilling platforms

Marine oil drilling platforms is an important investigation instrument in the exploration and exploitation for offshore oil and gas, whose safe berth and steady production has a close relationship to engineering geological condition of sea floor of well field. Evaluating technique of the engineering geological condition which relates to drilling platform safety has been studied in this paper. For instance, evaluating and forecasting a weaker soil layer in its punched-through or bearing capacity that relates to the safety of self-elevating offshore drilling platforms; evaluating and forecasting the stability of engineering geology layer on the slope of sea floor conditions; evaluating and forecasting anchor hold strength of semi- submersible drilling platforms; evaluating and forecasting the different conditions of sea bed which was eroded by ocean current. An available semi-empirical formula was recommended in order to supply a stable judgment of engineering geological condition for marine oil drilling platforms.