修正的稳态波动压力计算法在狭窄环空下套管中的应用

The Application of Modified Steady-state Wave Pressure Calculation in Narrow Annlar Case Structure

高温高压井由于压力台阶多、压力窗口小,大多数使用非常规层次套管结构,其特点是套管层次多、层间间隙小,所以突出问题之一就是套管能否下入,在下入过程中能否开泵循环。针对此问题,以稳态波动压力理论为基础,考虑套管接箍的局部阻力效应,研究了多层次、小间隙非常规套管入井过程中最大下放速度和遇阻开泵循环排量的问题,提出了理论计算模型,编制了相应的软件,并以南海西部油田的具体数据进行了验证。

Because of many pressure steps and small pressure windows, the well with high temperature and high-pressure often uses unconventional case structure which has small gap and many series. One of the problems is the case being put down or not, the other is the pump being open to recycle or not during the process of getting into well. We use flow theory based on steady state, consider the influence of case joint, and study the unconventional case during the process of putting down, the max speed of putting down, the discharge capacity of recycle with open pump. We claim calculating module and program the software about it .The result of calculation with this software can be used for guidance field operation and the result has been testified by oil field data.