LWD vs. Wireline Electromagnetic Propagation Resistivity is similar to Induction Resistivity: Induction Resistivity: - both use high frequency transmitter coils - both transmit EM signal in a parallel-type manner
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LWD vs. Wireline: things to consider
Electr Electroma omagne gnetic tic Propa Propagat gation ion Resis Resistiv tivity ity is simila similarr to Induction Resistivity Induction Resistivity (both use high frequency transmitter coils);
In 8.5 8.5 sectio section n LWD LWD tool size size is 6 ¾ ¾ and Wireline Wireline tool tool size size is 4.25 4.25 In 12.25 section LWD LWD tool size is 9 ½and Wireline tool size is 4.25
Rt curv curve e cho choic ice e for for wire wireli line ne is usually is usually the deepest reading curve;
Rt curve curve choi choice ce for for LWD depe depends nds on severa severall facto factors: rs:
larger mud effect for the wireline
If thin beds are present better to use shallow reading curve (RPCHM/RPCSHM) High formation resistivity resistivity phase difference difference better than attenuation attenuation (RPCHM) If deep invasion is encountered encountered while drilling drilling better use deep reading reading curve (RACHM/RACLM) If big washouts are created created while drilling and and eccentering occurs occurs better use deep reading reading curve (RACHM/RACLM)
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Laterolog: current path and simulation*
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Rtex: actual current path* Current stream lines and electricpotential patterns for MLR4 operating mode of Multi Laterolog in a formation where: B hd = = 8 in; R m=1 ohm-m and R t = = 10 ohm-m The current pattern is not symmetric symmetric with respect to the tool axis because the lower A5 electrode is shorter than
the upper A5 electrode.
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MPR MP RTE TEQ Q LWD Resistivity processing* FEATURES: The OnTrak tool makes 32 raw phase and amplitude measurements from which we derive MPR TEQ eight quantitative resistivities. Advanced MPR processing combines the raw phase-based measurements with the eight resistivities to yield four: - fixed fixed depth depth - shoulder shoulder bed bed corrected corrected and and - resolutio resolution n matched Resistiviti Resistivities. es. The four curves have depths of investigation fixed
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MPRTEQ Processing Principles Acquisition
Boreho Borehole le Corre Correcti ctions ons
Inver Inversio sions/ ns/Res Resolu olutio tion n Matchi Matching ng
