Difficulties and Technical Countermeasures for Improving Penetration Rate of Horizontal Wells in Honghe Oilfield

In order to break the technical bottleneck of low rate of penetration or long drilling time in horizontal wells of Honghe Oilfield,the four "One-Trip Drilling" techniques have been studied.A series of technical measures were developed to raise rate of penetration in upper vertical section and lower inclined section as well as horizontal section with one-trip method,including the selection of PDC bits to suit the formation drillability in view of the high formation abrasion and poor wellbore stability in Honghe Oilfield;adoption of potassium drilling fluids to keep wellbore stability and reduce formation damage;optimization of casing program and well profile according to drilling experience and current level of technology;"PDC+PDM+MWD" drilling mode was used in second vertical section and directional section in view of the low rate of penetration.The actual applications in 9 wells indicated that by taking above technical measures,upper vertical sections and lower inclined section as well as horizontal section could be drilled in one-trip operation,tripping times were reduced,and the average rate of penetration raised by 59.74%,average drilling time reduced by 42.31% than before.It showed that four "One-Trip Drilling" techniques could achieve goals of increasing the penetration rate in Honghe Oilfield.