Delay Pressure Detection Method to Eliminate Pump Pressure Interference on the Downhole Mud Pressure Signals

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="797549.fig.003a" src="https://static.hindawi.com/articles/mpe/volume-2013/797549/figures/797549.fig.003a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Signal waveform after delay pressure detecting</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="797549.fig.003b" src="https://static.hindawi.com/articles/mpe/volume-2013/797549/figures/797549.fig.003b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Reconstructed signal of mud pressure DPSK signal with time-domain differential equation</td></tr></table></td></tr><tr class="fig-image" id="c"><td><img alt="797549.fig.003c" src="https://static.hindawi.com/articles/mpe/volume-2013/797549/figures/797549.fig.003c.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(c) </b>Reconstructed signal of  mud pressure DPSK signal based on inverse Fourier transform</td></tr></table></td></tr></table>

<table>Reconstruction of mud pressure DPSK signal.</table>

Mathematical Problems in Engineering

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Figure 3

Figure 3: Delay Pressure Detection Method to Eliminate Pump Pressure Interference on the Downhole Mud Pressure Signals 