Diameter Series and Drill Pipe Scheme for Wire-line Coring with Small Diameter in Ultra-deep Borehole

Abstract:

The existing diameter series for wire-line coring are mainly suitable for shallow drilling with a depth of less than 3000 m. There is technical bottleneck such as that the designed depth cannot be reached in complex formation, when the wire-line coring is performed at a depth of about 4000 m. The demonstration on reasonable diameter series and drill pipe scheme for wire-line coring in ultra-deep borehole at the depth between 3000 m and 5000 m is an important preliminary work which can provide technical base for the development of ultra-deep borehole drilling equipment and drilling tools for wire-line coring. And it is also a public welfare and open technical work. This paper summarizes the preliminary ideas on diameter series and drill pipe scheme for wire-line coring in ultra-deep borehole with the expectation that it could receive wide participation and further demonstration from the drilling experts and technicians in China.