The development of wireline coring barrel vibration anti-blocking drilling tools
When drilling in fractured formations,conventional wireline coring tools are prone to core jamming,shortened round length,and reduced drilling efficiency,which is particularly obvious in deep holes.At present,the wireline coring hydraulic hammer technology has an excellent core anti-jamming function.However,due to its complex structure,high technical requirements,and high price,its popularity is not high.In practice,there is a lack of wireline coring tools with good core anti-jamming functions.The project has developed a new HQFD type wireline coring vibration anti-jamming coring tool.Among them,the anti-jamming inner tube assembly is the core of the research.The fixed-size development is carried out while keeping the length and diameter of the conventional HQ inner tube assembly unchanged,which is conducive to the efficient replacement between the inner tube assemblies.The pump volume requirement for the efficient vibration of this tool is highly consistent with the recommended pump volume in the HQ specifications and standards,and the additional pump pressure is low,which can achieve the core anti-jamming function at the minimum cost.The first generation of the HQFD type vibration anti-jamming coring tool has completed the research and development work such as the selection of the vibration principle,the layout of the functional mechanism,and the evaluation of the vibration effect.The new coring tool provides a new option for the core anti-jamming of wireline coring.
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