Development and experimental study of H-caliber hydraulic lifting wireline coring tool

Wireline coring is a widely used technology for core drilling without tripping the drill string. However, for horizontal and deep vertical holes, process of lowering the wireline coring tools is challenging and time-consuming, in which the efficiency decreases with the hole depth. Based on hydraulic lifting principles, utilizing the power of drilling fluid circulation, using a positive circulation for core drilling and a negative circulation for hydraulic fishing, the running-in-hole and fishing system is designed based on the existed coring drill, and the H-caliber hydraulic lifting wireline coring tool is developped. The tool are tested for 3 visualized rack, 4 core drilling runs, and 2 hydraulic lifting runs in a drilling platform and experimental boreholes. As a result, the coring operation is successfully completed and the hydraulic lifting recovery of the inner tube assembly is achieved, which offers a new perspective for coring in horizontal and deep vertical holes.