Loose broken formation coring technology in north slope block of Henan oilfield

Aiming at the low harvest of core problem in north slope block formation, through the optimization of adaptive stronger R-8120-type pressurized coring tool, the appropriate drilling parameters has been selected and coring tool has been improved in the actual coring process and their process technology has been optimized, which increased the block coring rate of 63. 80% to 82. 77% , and achieved a better application effect and economic benefits