泥浆动力旋转导向钻井工具原理及压降计算

Analysis on Dynamic Characteristics of Mud-Powered Rotary Steerable Drilling Tool

旋转导向钻井工具的动力来源主要有电池、泥浆动力、涡轮发电机。由中海油研究总院牵头研制的旋转导向钻井工具是以泥浆动力为导向动力来源,通过井底钻柱内外泥浆压差驱动3个导向翼肋的伸缩,控制钻头沿目标轨迹钻进。分析了流量、钻头喷嘴组合、泥浆性能等参数对该压差的影响。现场试验结果证明了理论计算的正确性,为研制该类工具提供了理论基础。

Now, the mainly power of the rotary steerable drilling tools that had commercial applied were：battery, mud power, turbine generators, etc. The rotary steering drilling tool that was devel- oped by CNOOC Research Institute was powered by the drilling mud. It could control the well trajectory by the three pads＇ hold in and out that would get the bit depart from the axes of the well, and then realized the orient drilling. Then, the effect of flow and characteristics of the mud, and the effect of nozzle combination of the bit were analyzed, and a reference to the tool＇s field test was provided. The results of the field test proved the correctness of the theoretical calcula- tion,and this study would provide theory basis for the development of the mud-powered rotary steerable drilling tools.