近钻头方位伽马在地质导向中的应用
Azimuthal GR Application of Near Bit in Geological Orientation

在薄油层、页岩气、煤层气开采中，为了使钻头尽可能从薄储层、页岩或煤层中心穿过，常常采用地质导向技术，利用近钻头自然伽马和近钻头电阻率曲线对井下钻头的位置进行监控，以便在地面对钻头的空间位置做出调整。方位自然伽马进入储层和穿出储层时，会出现伽马值的差异，利用此异常，地面控制系统据此可调整钻头的方向，使其从储层中穿过，从而减少有效储层所造成的损失，提高产能和开发效益。
During developing thin oil-bored layer, shale gas and methane, geological orientation technology is usually employed so that bit can pass into the thin layer with the most possibility. In the techniques of geological orientation, the curves of GR and resistivity near bit can supervise bit position, with which the controlling system in the surface can adjust space position of bit. Because azimuthal GR value is different when the bit passes into or is away from the thin reservoir, azimuthal GR was used to help the surface control system adjusting the bit orientation so that the effective reservoir loss decreased and the producing profits increased.