套管压力在油气井压力控制中的应用

Applications of the Casing Pressure in Oil-gas Well Pressure Control

立管压力和套管压力是油气井井控作业中两个重要的压力数据 ,常规压井作业中用立管压力进行控制。但井下情况复杂多变 ,尤其是压力传递需要时间 ,给调节节流阀控制立压带来不便。恰当准确地利用套压 ,不论在常规还是特殊井控作业中 ,都具有不可替代的作用。套管压力控制法常用在司钻法、容积法。

In oil-gas well control operation both stand pipe pressure and casing pressure are important pressure data. We often use standpipe pressure to conduct well control in common well-killing operations. Due to the complication and variety in the hole especially the time that is needed to transmit pressure it is very inconvenient to use choke valve to control standpipe pressure. Not only in common well-killing method but aiso in unusual well-killing operations is it not to be replaced in some conditions using casing pressure appropriately and precisely. Casing pressure is usually used in Driller's method, Volumetric method, Displacement method and many other unusual well-killing methods etc.