Comprehensive study and Application of Geological Core drilling Technology in shallow Gas area

Abstract:

The development of nuclear power requires a stable supply of uranium resources. For the strategic selection and investigation & evaluation of sandstone-type uranium deposits in oil and gas basins in northern China, the main anomalies and key areas need to be verified by coring drilling. In view of the poor geological conditions of extreme loose and broken strata with low core recovery, shallow gas development, high well control request, large diameter hole reaming with difficult well inclination control and difficult rock carrying, construction in extremely cold winter and high environmental protection request, a set of green integrated drilling techniques and methods is successfully explored for drilling in extremely loose fractured formation in shallow gas area such as single pipe cone valve coring, environment-friendly high viscosity and low cement loss slurry, remote well control, graded reaming with drill collar and guiding drilling tool, which provides technical support for prospecting breakthrough of sandstone-type uranium deposit in northern China and energy supply security with extension demonstration.