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摘要: 在深水油气勘探开发中，作业环境复杂多变，为了躲避台风等恶劣天气对海上钻井的危害，防喷器与隔水管的应急解脱成为避免海上钻井事故的关键环节。为探究隔水管应急解脱的反冲规律，分析了隔水管应急解脱的原因及反冲过程，利用OrcaFlex方法建立了应急解脱工况下隔水管系统轴向力学分析模型，利用该计算模型，以南海某1520 m深水井为例研究了张紧力、波浪运动、钻井液密度、平台漂移等因素对隔水管反冲的影响。结果表明，解脱时顶部张紧力越大，解脱后隔水管的反冲位移和伸缩节的冲程变化也越大；随着波浪高度的升高隔水管的反冲响应有加强趋势；波浪方向对隔水管的反冲响应没有影响；管内不同钻井液密度对隔水管反冲影响明显；随着平台漂移距离的增加，隔水管的反冲响应更加剧烈。研究结果对保障反冲时隔水管的安全有一定指导意义。Abstract: In deep water oil and gas exploration and development， the operation environment is complex and changeful. In order to avoid the damage of typhoon and other bad weather to offshore drilling， the emergency release of the blowout preventer and the riser has become the key to avoid offshore drilling accidents. In order to explore the recoil law of the riser in emergency release， the causes and recoil process of emergency release of the riser were analyzed. The axial mechanical analysis model was established for the riser system under emergency release condition by using OrcaFlex method. Taking a 1520m deep water well in the South China Sea as an example， the effects of tensioning force， wave movement， drilling fluid density and platform drift on riser recoil were studied. The results showed that the larger the top tensioning force was， the larger the recoil displacement of the riser and the change of the stroke of the expansion joint were. With the increase of wave height， the recoil response of the riser tended to strengthen. The wave direction had no effect on riser recoil response. Different drilling fluid densities in the pipe had obvious influence on riser recoil. With the increase of platform drift distance， the recoil response of the riser became more intense. The research results have certain guiding significance for the safety of the riser in recoiling.
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Key words:
- deep water drilling /
- riser /
- emergency release /
- recoil /
- OrcaFlex
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