Design and Application of Flexible Drilling Tools for Multi-branch Ultrashort Radius Wells
The use of multi-branch ultrashort radius wells can efficiently target the enrichment of remaining and attic oil in old and medium-aged oil fields,increase the area of reservoir oil leakage,and improve the oil recovery rate of the oilfield.Flexible drilling tools are the core tool in the technology of ultrashort radius sidetracking multi-branch wells,and the forces during the drilling process are relatively complicated.There is no complete design method and corresponding mechanical analysis for flexible drilling tools in China.Based on the process characteristics and on-site requirements,mechanical analysis and overall structural design of the flexible drilling tool were conducted,and a design method for the overall pipe string was provided.A mechanical model was established for finite element analysis,and the strength of the drilling tool under different load conditions was checked.The on-site application result of the flexible drilling tool in a well in the South China Sea indicated that the drilling process is smooth,with a daily production increase of three times and a water content reduction of 53％compared to before treatment.This can provide a reference for the design and research of flexible drilling tools suitable for multi-branch ultrashort radius wells.
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