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在高压油藏钻井过程中 ,为控制井底循环压力、减小风险 ,常规方法是采用过平衡压力钻井。过平衡压力钻井特别容易造成井口压力过高或钻井液密度过大。井口压力过高 ,对司钻人员及井口设备不利 ;钻井液密度过大增加了钻井成本。动态压力控制方法是针对高压油层钻井而开发的一种新技术。它是在油井内建立第二个环空 ,通过第二环空循环液体的摩擦压力损失来控制井底压力 ,它使低压头钻井和欠平衡动态钻井成为切实可行的方法。
In the process of drilling in high pressure reservoirs, over-pressure drilling is used to control the bottom hole circulating pressure and reduce the risk. Over-balanced pressure drilling is particularly prone to overpressure in the well head or excessive drilling fluid density. Wellhead pressure is too high, the Drill staff and wellhead equipment adverse; drilling fluid density increases drilling costs. Dynamic pressure control method is a new technology developed for high pressure reservoir drilling. It establishes a second annulus in the well and controls bottom hole pressure through the frictional pressure loss of the second annulus circulating liquid. It makes low pressure head drilling and underbalanced dynamic drilling a feasible method.