PRECISE MANAGED PRESSURE DRILLING TECHNOLOGY OF WELL NP23-P2009

The No.2 structure of NP buried-hills Ordovician layer is a typical pressure-sensitive layer with narrow density window. The drilling process in this kind of layer has the following difficulties:simultaneous well blowing and leakage;serious lost circulation;hard to reach the designed well depth, etc. Aimed at this situation, Jidong Oil Field introduced precise managed pressure drilling technology for the first time, and successfully applied it in buried-hills Ordovician layer to solve problems such as "Narrow density window"of fractured oil reservoir. This article introduced the drilling difficulties of No.2 structure buried-hills Ordovician layer, the system composition and working principle of precise managed pressure drilling, and application status in well NP 23-2009. The successful application of such technology provided technical reference and gained valuable practice experience for developing NP buried-hills fractured oil reservoir.