DIL5520双感应测井仪温漂及测井问题分析

Temperature Excursion Analysis of DIL5520 Dual Induction Logging Tool

DIL5520双感应测井仪在测井时存在温漂问题，即在高电阻率井段测井曲线重复性不好。对DIL5520双感应测井仪的基值温漂指标进行分析，认为常规感应仪器遇高电阻率地层重复性不好是仪器本身指标无法满足要求，DIL5520双感应测井仪器可通过改变加温工艺提高其稳定性。提出了解决温漂问题的方法，如改变加温工艺流程，增加100℃记录点；在各温度点恒温30min；在仪器加温前，将线圈系用硅油充分浸泡；进行软件温度补偿等。DIL5520双感应测井仪在中高电阻率地层存在测井值偏低或偏高及有时出现跳尖和重复性不好的问题，可通过在井下布置多个发射和接收线圈改善感应测井的探测性能。为保证仪器的重复性，在感应测井时要按规定安装扶正器；对于井径较大的井段，只有通过校正图版校正。

The logging curve repeatability of DIL5520 dual induction logging tool is unsatisfactory in high resistivity formation because of the temperature excursion in logging. Conventional induction logging tool with bad repeatability is due to its configuration, but for DIL5520 dual induction logging tool, we can improve its stability by changing warming processes. Proposed is 4 ways to improve its repeatability： （1）increase 100 ℃ reporting spot; （2） keep each temperature for 30 min; （3） fully soap the coil array in silicone oil before warming the tool, and do software temperature compensation, etc. To solve the problems such as abnormal log values and unsatisfactory curve repeatability in middle and high resistivity formation logging with the DIL5520 tool, the ideal solution is to put several emission and receiving coils downhole to improve its detection performance. For induction logging, we should assemble centralizer according to regulation to ensure logging curve repeatability. As for wells with bigger borehole diameter, the calibration chart is needed to guarantee the log data correction.