The Key Technologies of High Precision Imaging Logging while Drilling
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摘要:
为了解决随钻地质导向系统距离钻头远、检测信息少和检测精度低的问题，基于随钻扇区扫描原理，结合MEMS动态工具面检测技术、近钻头伽马旋转累计计数成像采集算法和随钻电阻率动态PID调节发射驱动成像采集算法，研制了高精度近钻头伽马成像测井仪和高精度随钻电阻率成像测井仪，实现了近钻头伽马16扇区测量与随钻电阻率128扇区测量。现场试验结果表明：随钻采集到的近钻头伽马成像测井数据可为复杂油气藏地质导向钻进提供技术支持；随钻电阻率成像测井数据与电缆测井数据吻合，可为随钻地层评价提供可靠数据。研究表明，利用近钻头伽马成像测井仪和高精度随钻电阻率测井仪可以获得高精度的测井数据，为地质导向和地层评价提供支持。
Abstract:In order to solve the problem of the long distances between the geosteering while drilling system and the drill bit, and the problem of limited detection information and low detection accuracy, a near-bit gamma imaging logger and a high-resolution resistivity LWD tool were developed. They are based on the principle of sector scanning while drilling, which combines with a MEMS dynamic tool surface detection, imaging acquisition algorithm of near-bit gamma rotation cumulative counting, and the imaging acquisition algorithm driven by the dynamic PID adjustment emission of resistivity while drilling. It takes into consideration the fact that the near-bit gamma measurement covers 16 sectors and resistivity while drilling measurement contains 128 sectors. The results of field test suggest that the near-bit gamma imaging LWD data can provide technical support in the geosteering drilling of complex oil and gas reservoirs, while the resistivity LWD data is consistent with the cable logging data and can provide valid data for formation evaluation while drilling. Studies show that the near-bit gamma imaging logger and the high-precision resistivity LWD logger can acquire very large quantities of high precision logging data, and provide support in geosteering and formation evaluation.
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Keywords:
- logging while drilling /
- imaging logging /
- gamma logging /
- resistivity logging /
- geosteering /
- tool face
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图 4 近钻头伽马探测器的方位探测特性曲线
Figure 4. Azimuth detection characteristic curve of the near-bit gamma detector
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图 5 近钻头伽马成像测井16扇区示意
Figure 5. Schematic diagram of 16 sectors near-bit gamma imaging logging
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