A Study of Downhole Weight on Bit Calibration Model and Performance Assessment on Field Trial Data
A Study of Downhole Weight on Bit Calibration Model and Performance Assessment on Field Trial Data
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DOI：
10.12783/dtetr/3rd/amma2017/14763
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
Hailong Jiang;Gong-hui Liu;Jun Li;Xi-hui Hu;Geng Tang;Jian-hua Guo;Quan Cao;Bin Li
中科院分区：
文献类型：
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作者：
Hailong Jiang;Gong-hui Liu;Jun Li;Xi-hui Hu;Geng Tang;Jian-hua Guo;Quan Cao;Bin Li
获得真实的井下钻压是钻井中的一个关键问题。提出了一种将钻压传感器的测量阅读转换为钻头与地层之间的作用力的钻压标定模型DWOB。在标定模型的推导过程中，讨论了压力、温度和钻柱动力学等因素对测量阅读的影响。此外，还利用田间试验数据对模型性能进行了评价。钻压传感器阅读校准后，钻柱下入和起出时，DWOB保持在零附近的小范围波动趋势。此外，计算表明，压力在校准模型中起着更重要的作用相比，其他因素。该标定模型适用于直井和斜井威尔斯。
Obtaining real downhole weight on bit (DWOB) is a critical issue in drilling. In this paper, a weight on bit (WOB) calibration model which converted measurement reading of WOB sensor to force between bit and formation, namely DWOB, was proposed. Influence factors of measurement reading such as pressure, temperature and drillstring kinetics had been discussed in the derivation of the calibration model. Moreover, the model performance assessment was also studied with field trial data. After calibration of WOB sensor reading, DWOB maintains the fluctuating trend around zero in a small range when running drillstring into hole and pulling it out of hole. In addition, calculations indicate that pressure plays a more important role in calibration model compared to other factors. The calibration model is appropriate for both vertical and inclination wells.