深水钻井隔水管与井口耦合作用力学仿真分析

发布时间：2018-08-01 08:56

【摘要】：深水钻井时由于海底情况复杂,井口系统的稳定性可能受到诸多因素的影响。本文结合实际工况,综合考虑浪流载荷和地基反力等因素,建立了深水钻井系统力学理论模型,并分析了张紧力和平台偏移量对隔水管和地层组合管柱力学行为的影响规律。分析结果表明:上部载荷对地层管柱作用都集中在管柱的上部较短区域,作用能力有限;增加张紧力可以减小隔水管的横向位移和截面弯矩,有利于隔水管的稳定,但是会增加地层组合管柱的横向位移和弯矩,增加井口装置倾覆的风险;过大的平台偏移量会导致全段管柱较大的横向位移和截面弯矩,使得管柱被破坏的可能性大幅度增加。所以在钻井作业时,有必要控制平台偏移量,取用合适的张紧力,保证作业安全。
[Abstract]:During deep water drilling, the stability of wellhead system may be affected by many factors due to the complex undersea conditions. In this paper, considering the factors of wave flow load and foundation reaction, the mechanical model of deep water drilling system is established, and the influence of tensioning force and platform offset on the mechanical behavior of riser and formation combined string is analyzed. The results show that the effect of upper load on the formation string is concentrated in the short area of the upper part of the string, and the ability of action is limited, and the increase of tension can reduce the transverse displacement and section bending moment of the riser, which is beneficial to the stability of the riser. However, the lateral displacement and bending moment of the composite string in the formation will be increased, and the risk of overturning of the wellhead device will be increased, and the excessive displacement of the platform will lead to the larger transverse displacement and the bending moment of the cross section of the whole section of the pipe string, which will increase the possibility of the string being destroyed by a large margin. Therefore, it is necessary to control the offset of the platform and take the appropriate tension to ensure the safety of the drilling operation.
【作者单位】：长江大学机械工程学院;湖北省油气钻完井工具工程技术研究中心;
【基金】：国家自然科学基金“深水无隔水管钻井涡动对钻柱动态响应研究”(51405032) 西南石油大学油气藏地质及开发工程国家重点实验室(PLN201605) 石油天然气装备教育部重点实验室(OGE201403-06) 长江大学青年人才基金项目(2015cqr15)资助
【分类号】：TE52

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