安徽淮南煤田绳索取心钻进工艺的应用效果分析OA

Based on the wireline coring project of"Well Xinxie-1"in the Huainan Coalfield,this paper presents a comparative analysis between wireline coring drilling and conventional drilling techniques,summarizing their respective advantages and limitations.The results indicate that wireline coring outperforms conventional drilling in multiple aspects:higher drilling efficiency,reduced borehole deviation,improved core recovery rate,better coal core quality,lower gas loss from coal samples,longer bit life,reduced connector material consumption and lower labor intensity.However,wireline coring is more prone to drilling incidents such as bit jamming,drill pipe breakage and failure in inner tube deployment.The primary causes are twofold:the relatively soft lithology and high number of coal seams in the Huainan strata,coupled with the thin-walled pipes for packed hole drilling and narrow annular clearance—both between the drill pipe and borehole wall and between the outer and inner tubes.To mitigate these risks,technical improvements are proposed,including appropriately increasing the drill bit diameter,enhancing drill string strength and enlarging the annular clearances.