Difficulties in raising of horizontal drilling rates in lowpressurefractured volcanic rocks and solutions

Abstract:

The Songnan volcanic rock stratum has strong abrasiveness and poor drillability, leading to low drilling rates and long drilling periods. With the continuous advancement of exploration and development, the pore pressure of volcanic fractured reservoirs decreases gradually. At present, the development well type is mainly horizontal wells, where drilling rates are restricted due to acute circulation loss. In view of this problem, this paper describes the geological characteristics and the drilling difficulty with evaluation and optimization of the existing technology in regard to the progress on drilling technology for the Songnan volcanic rock in recent years. The measures and recommendations are presented for increase of the drilling rate in subsequent drilling in the region on the basis of field application results.