实时监测直推存储式测井系统研制与应用

Development and Application of Real time Monitoring System for Direct Push Storage Logging

  • 摘要: 针对塔里木盆地深层超深层碳酸盐岩油气藏埋深大、温度高、压力高及井况复杂等特点,常规测井工艺难以满足施工需求,直推存储式测井已成为复杂井眼条件下重要的测井技术手段。但现有直推存储式测井系统普遍不具备井下仪器状态实时监测能力,作业过程处于“盲测”状态,遇阻遇卡时无法精准判别故障位置与仪器工况,存在测井失败风险。为此,将随钻测量(MWD)系统与直推存储式测井仪器融合,研制出具备实时监测功能的直推存储式测井系统。该系统由地面采集系统、MWD工具及直推存储测井仪组成,采用2PSK连续钻井液波调制方式与自适应滤波信号提取技术,实现井下仪器通讯状态、工作电压、电流及张压力等关键参数的实时上传。在塔里木油田4口井进行了现场试验,最大井深 8771 m,最高井温178 ℃,最大井底压力98 MPa,最长作业时长66 h,测井过程成功实现实时监测测井仪器的状态,可精准判别仪器遇阻遇卡工况,为现场施工决策提供依据,显著提升复杂井测井成功率与作业安全性。针对当前钻井液脉冲传输速率偏低问题,建议后续开展高速无线传输技术研究,进一步丰富实时监测数据类型。

     

    Abstract: The direct push storage logging technology has been widely used in complex well conditions such as ultra deep, high temperature and high pressure, high inclination wells, and horizontal wells in the Tarim Oilfield. During logging construction, the instrument is combined at the bottom of the drilling tool, and the working status of the instrument needs to be raised to the surface and obtained by reading memory data. The entire logging process is in a "blind logging" state. In order to ensure the timeliness of direct push storage logging, this paper proposes integrating a wireless while drilling measurement system on the upper end of the logging instrument. The instrument measurement signal is uploaded through mud pulses, and the communication status, tension pressure, working voltage, and current of the instrument string are monitored in real time after decoding on the ground. Practical application has shown that this solution effectively solves the problem of "blind logging" in direct push storage logging. During operations, it enables effective determination of whether jamming is caused by drilling tools or logging tools, as well as whether the tool is malfunctioning. This provides data-backed support in real-time decision-making in logging operations and holds value for widespread adoption.

     

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