Investigation and Application of Pore Pressure Monitoring Method Based on LWD Data
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摘要: 为了在钻井过程中实时准确地监测地层孔隙压力，保障钻井安全，研究了一种基于随钻测井资料的地层孔隙压力监测方法。以WITS数据格式和TCP传输方式为基础，研发了实时数据采集与处理程序，实现了随钻测井数据的采集与远程传输；根据随钻测井数据的传输特性，建立了一种基于单点算法的地层孔隙压力监测模型。该模型将随钻测井数据离散化，可以实时计算各数据点对应的地层孔隙压力，同时兼顾了压力监测的准确性与实时性。南海莺琼盆地数口井的应用表明，孔隙压力监测精度较高，与实测压力相比，误差均在10%以内。研究结果表明，该方法能够提供准确的孔隙压力实时监测数据，可以为钻井工程设计与施工提供指导。Abstract: To accurately monitor pore pressure while drilling and improve drilling safety,this paper presented a pore pressure monitoring method based on logging while drilling(LWD)data.Firstly,a real-time data collection and processing program was developed based on WITS data standard and TCP transmission mode,which was able to realize the acquisition and transmission of LWD data.Then,according to the transmission characteristics of LWD data,a pore pressure monitoring model was established based on single-point algorithm.In this model,LWD data were discretized and used to estimate corresponding pore pressure values in real time.The application of this method in several wells of an overpressure basin of South China Sea showed the arithmetical differences between monitoring results and real measured pore pressure values were no more than 10%,proving the method could provide accurate pore pressure data in real time,meet current field requirements,and guide drilling design and operation.
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Keywords:
- LWD data /
- pore pressure /
- real-time monitoring /
- single point algorithm /
- data acquisition
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