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近年来,随着海洋和陆地定向钻井活动的高涨,一些长期以来发展缓慢的工具和设备的发展速度大大加快,有些已获得突破。 1.PDC(Polycrystalline Diamond Compact聚晶金刚石复合)钻头 PDC钻头适合于小钻压、高转速,很适合于和涡轮钻具、螺杆钻具等配合使用。1978年初,此种钻头的研制首先在荷兰获得突破,随后在北部北海获得迅速推广使用。此钻头适用于软到中硬地层,性能优异。例如,一个4W型钻头在486.5小时内钻完了从2529米到4602米的整个12 1/4″井段。目前,
In recent years, with the rise in offshore and onshore directional drilling activities, some of the tools and equipment that have been slow to develop for a long time have greatly accelerated and some have achieved breakthroughs. 1.PDC (Polycrystalline Diamond Compact) PDC bits suitable for small bit pressure, high speed, it is suitable for use with turbine drills, screwdrivers, etc. used in conjunction. In early 1978, the development of such drill bits first achieved a breakthrough in the Netherlands and was subsequently rapidly promoted in the northern North Sea. This bit is suitable for soft to medium hard formations, excellent performance. For example, a 4W drill drilled the entire 12 1/4 "well from 2529 to 4602 meters in 486.5 hours,