In oil and gas production in deep-water high-pressure–high-temperature (HP–HT) wells, wellhead uplift may cause the seal failure of wellbore integrity. Aiming at the oil and gas production stage in deep-water HP–HT wells, we considered the influence of cement sheath cementation and developed a model for calculating the height of wellhead uplifts, and simulation experiments for wellhead uplifts were carried out under the condition of the double pipe string at different cement return heights and multilayer pipe string coupling cementing and noncementing based on a self-developed HP–HT wellhead uplift simulation device. The results show that the elongation of the double pipe string under the condition of a cement return height of 100% is reduced significantly compared with that under the condition of a cement return height of 50%. Also, the maximum elongation of the multilayer pipe string under the condition of coupling and cementing is significantly reduced compared with that under the condition of noncementing. These show that cement sealing has a binding effect on wellhead uplifts. The error between the calculated and the experimental results is less than 10%; thus, the model can be used to predict the wellhead uplift height under different working conditions and provide technical guidance for designing scientific measures to prevent wellhead uplifts.

中文翻译：

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水泥回水高度对深水高压高温井井口抬升的影响

在深水高压高温（HP-HT）井的油气生产中，井口隆起可能导致井筒完整性的密封失效。针对深水HP-HT井的油气生产阶段，我们考虑了水泥鞘胶结作用的影响，建立了计算井口隆起高度的模型，并在一定条件下进行了井口隆起的模拟实验。基于自行开发的HP–HT井口隆起模拟装置，在不同回水高度下的双管柱和多层管柱耦合固井和非固井。结果表明，与水泥回程高度为50％的情况相比，水泥回程高度为100％的情况下双管柱的伸长率明显降低。也，与不固井相比，在耦合固井条件下多层管柱的最大伸长率明显降低。这些表明水泥密封对井口隆起具有约束作用。计算结果与实验结果之间的误差小于10％；因此，该模型可用于预测不同工况下井口抬升高度，为设计预防井口抬升的科学措施提供技术指导。