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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。
Due to the complex seabed conditions during deepwater drilling, the stability of the well head system may be affected by many factors. Based on the actual conditions and considering the factors such as the wave load and the reaction force of the foundation, the mechanical theory model of deepwater drilling system is established and the influence of tension and platform displacement on the mechanical behaviors of riser and stratum law. The analysis results show that: the action of the upper load on the formation pipe string concentrates on the short upper part of the pipe string, and the limited action force; increasing the tension force can reduce the lateral displacement and the bending moment of the riser pipe, which is in favor of the riser stability, But will increase the lateral displacement and bending moment of the composite column of the strata and increase the risk of overturning of the wellhead device. Excessive platform displacement will lead to large lateral displacement and cross-section bending moment of the whole section of the column, so that the column is damaged Possibility of substantial increase. Therefore, drilling operations, it is necessary to control the platform offset, take the appropriate tension to ensure job safety.