水下导管出泥高度对井口稳定性的影响研究

针对工程中的具体问题,提出了导管允许高度与井口倾斜角相互关系的计算方法和模型,并对番禺35-2气田进行了导管出泥高度分析评价研究。对于井口的分析采用力学等化计算方法,把位于井口以上的设备对井口的力进行传递等化,在不同作业工况下采用统一的计算模型进行井口的校核模拟。分析结果表明,对于水下井口而言,最危险工况为完井作业工况,完井工况的侧向力比钻井工况大一个数量级,并且完井工况的弯矩也较大;井口允许导管出泥高度和井口倾角之间近似为二次曲线关系。

Research on the Effect of the Underwater Conductor Sludge Height on Wellhead Stability

In light of specific problems in engineering,the calculation method and model of the interrelationship between permissible conductor height and tilt angle were formulated.An analysis and evaluation of the conductor sludge height in Gasfield 35-2 in Panyu was conducted.The dynamic equalization calculation method was adopted to deal with the wellhead analysis.The above-wellhead equipment force on the wellhead was transmitted and equalized.The uniform calculation model was adopted to verify and simulate the wellhead in different operating conditions.The analysis shows that as for underwater wellhead,the most dangerous operating condition is that of well completion.The lateral force of completion operation is greater than that of drilling operation by an order of magnitude,with a relatively great bending moment.The relation between the permissible wellhead conductor sludge height and the wellhead tilt angle is approximate to that of a quadric curve.