摘要
井壁取心通常是采用跟踪视电阻率曲线定位.在井内泥浆及地层水矿化度高的情况下,视电阻率曲线幅度太低,难以准确跟踪井壁取心的位置.若采用电极系作井下定位仪,所需的完好电缆缆芯数目多.而井壁取心作业对电缆的破坏大,容易造成电缆断芯,出现缆芯不够用.本文介绍对FC-751型放射性仪器的改造,以满足井壁取心跟踪定位的需要。
Usually, side-wall core taker uses apparent resistivity curve for locating formation. Inthe well of salt mud and salt formation water, the deflection of apparent resistivity curves islow, it is very difficult to trace formation accuratly. In addition, electrode locator occupiesnumerous cable conductors, core taking operation is apt to damage cable. It occurs very of-ten that cable conductors are not enough. This paper introduces modified radioactivity toolFC-75, which is used as locator and overcomes foregoing problems.
