油气钻井极硬岩层钻头用孕镶齿研究

Study on impregnated teeth for bits in extremely hard rock formation of oil and gas drilling

本文介绍了油气钻井极硬岩层钻头用孕镶齿的原材料和结构设计,并重点介绍了孕镶齿制备关键技术—金刚石"包裹球"技术和热等静压处理工艺对孕镶齿物理力学性能的影响。通过室内孕镶齿磨削试验验证了热等静压工艺对孕镶齿的致密度和耐磨性的影响;制备了6吋孕镶钻头并在钻井平台试验,孕镶钻头在压力6.7 t(67 kN)和转速140 r/min的条件下,钻进10级硬度花岗岩平均机械钻速可达2.7 m/h。

This paper introduces the raw material and structure design of impregnated teeth used for drilling bits in extremely hard rock at oil and gas exploitation, and emphatically introduces the key technology of impregnated teeth preparation, which are the Diamond "encapsulated ball" technology and HIP process treatment technology.The influence of HIP process on the density and wear resistance of impregnated teeth is verified by indoor grinding test and 6 inch impregnated bits are prepared and test on drilling platforms. The average drilling speed of the impregnated bits in Grade 10 hardness granite can reach 2.7 m/h under the pressure of 6.7 t and rotary speed of140 r/min.