Application of boundary detection tools for drilling formation in X50 block of Xiazijie Oilfield
Affected by complex structures,during the drilling process of horizontal wells,problems such as unstable wellbore,stuck drilling,difficulty in adjusting horizontal well deviation appeared in X50 well block of Xiazijie Oilfield,resulting in side drilling and other problems.In response to the problems,Schlumberger Company conducted a feasibility study on the combination of rotary steering and boundary detection tools based on the geological and reservoir resistivity characteristics of this block.With a deep detection depth,the boundary detection tool is an electromagnetic induction logging tool with directional measurement while drilling.Real-time guidance software is used to invert the measured parameters and estimate the distance from the tool to the formation boundary and the extension direction of the formation boundary.Field applica-tion indicates that during the sidetracking process of the first horizontal well SP-2,the use of boundary de-tection tools can predict the positions of the top and bottom mudstones in advance,and adjust them in real-time based on the distance between the trajectory and the boundary to avoid encountering mudstones.The mechanical drilling speed has increased by nearly twice,and the reservoir drilling rate has reached 100%,reducing circulation and decision-making time,and improving drilling efficiency.The successful side-tracking of SP-2 well provides technical support for the later development and lays the foundation for geolo-gy-engineering integration.
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