井漏是钻井工程中经常遇见的一种井下复杂情况,井漏的检测、漏失位置和漏失速度的确定是井漏处理的重要前提和基础。由于环空压耗相比泥浆静液压力要小很多,且影响井底压力的因素太多,因此,单PWD(pressure while drilling)压力不适合作...井漏是钻井工程中经常遇见的一种井下复杂情况,井漏的检测、漏失位置和漏失速度的确定是井漏处理的重要前提和基础。由于环空压耗相比泥浆静液压力要小很多,且影响井底压力的因素太多,因此,单PWD(pressure while drilling)压力不适合作为井漏检测的主要依据。而双PWD之间压差计算相对简单,干扰因素少,适合用于井漏检测。基于复杂结构井钻井井筒复杂流动机理,提出了一种利用双PWD压力和压差数据检测井漏的新方法。通过室内实验和现场测试表明,该方法能较准确识别井漏,并估算井漏位置或井漏速度,为复杂井或多套漏层井的安全钻进提供帮助。由于双PWD工具检测井漏尚处于探索阶段,复杂工况下的理论模型、算法和实测数据还需要持续研究和完善。展开更多
The identification features of composite pseudocode phase modulation and carry frequency modulation signal include pseudocode and modulation frequency. In this paper,PWD is used to extract these features. First,the fe...The identification features of composite pseudocode phase modulation and carry frequency modulation signal include pseudocode and modulation frequency. In this paper,PWD is used to extract these features. First,the feature of pseudocode is extracted using the amplitude output of PWD and the correlation filter technology. Then the feature of frequency modulation is extracted by way of PWD analysis on the signal processed by anti-phase operation according to the extracted feature of pseudo code,i.e. position information of changed abruptly point of phase. The simulation result shows that both the features of frequency modulation and phase change position caused by the pseudocode phase modulation can be extracted effectively for SNR=3 dB.展开更多
文摘井漏是钻井工程中经常遇见的一种井下复杂情况,井漏的检测、漏失位置和漏失速度的确定是井漏处理的重要前提和基础。由于环空压耗相比泥浆静液压力要小很多,且影响井底压力的因素太多,因此,单PWD(pressure while drilling)压力不适合作为井漏检测的主要依据。而双PWD之间压差计算相对简单,干扰因素少,适合用于井漏检测。基于复杂结构井钻井井筒复杂流动机理,提出了一种利用双PWD压力和压差数据检测井漏的新方法。通过室内实验和现场测试表明,该方法能较准确识别井漏,并估算井漏位置或井漏速度,为复杂井或多套漏层井的安全钻进提供帮助。由于双PWD工具检测井漏尚处于探索阶段,复杂工况下的理论模型、算法和实测数据还需要持续研究和完善。
文摘The identification features of composite pseudocode phase modulation and carry frequency modulation signal include pseudocode and modulation frequency. In this paper,PWD is used to extract these features. First,the feature of pseudocode is extracted using the amplitude output of PWD and the correlation filter technology. Then the feature of frequency modulation is extracted by way of PWD analysis on the signal processed by anti-phase operation according to the extracted feature of pseudo code,i.e. position information of changed abruptly point of phase. The simulation result shows that both the features of frequency modulation and phase change position caused by the pseudocode phase modulation can be extracted effectively for SNR=3 dB.
