Application of sonic logging while drilling in the oil field
Works with conventional drilling acoustic logging wireline logging tool is substantially the same, except the real-time logging alteration performed before the formation can be obtained and more accurate real-time values of t.
LWD sonic logging information is mainly used to:
calculate formation porosity, depth conversion synthetic seismograms with the seismic data, analysis of rock mechanical properties, lithology identification, identification gas layer, and correlation analysis was done conventional log data and contrast .
Compared with other drilling acoustic logging while drilling method, it is unique in that most accurately predicted overpressured formations and analysis of rock mechanical properties. LWD sonic logging and seismic combination, performs the correlation process by the synthetic seismograms with the surface seismic data channel, the relative spatial position of the seismic criteria and reflective layers is calculated according to the drill bit, accurate positioning of abnormal formation pressure is present. So engineers can determine in advance the optimal mud weight window, not only to improve the drilling efficiency and drilling safety factor, and it is possible to lower casing to the optimum depth, increase oil production. The analysis of rock mechanical properties, on the one hand contribute to the safety of drilling and drilling optimization method, on the other hand can do correlation analysis and data logging of production wells to determine the extent of sand and fracturing effects.
With the development of drilling sonic logging outlook
LWD superiority to conventional wireline increasingly be reflected, to develop LWD has become a consensus. Can be predicted with the future development trend of drilling acoustic logging follows:
1, the instrument acoustic wave field drilling environment, and wherein the probe response based numerical simulation and experimental study of physics, the optimal measurement conditions and find the best model is the key measure.
2, acoustic logging while drilling efficient insulation material and the transducer, good acoustic research-based material stability.
3, to explore new methods and new carrier, to increase the transmission rate of the real-time LWD sonic data, while increasing the amount of processing of the waveform data downhole, reduce the data requires real-time transmission.
4, near-bit instrumentation design, high temperature high pressure and rising characteristics.
5, acoustic logging while drilling supporting the processing and interpretation software development
6, a combination of seismic while drilling and other drilling equipment and the use of more scientific.
