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Overview - Multiple Propagation Resistivity (MPR®)
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|  INTEQ's MPR® tools set the industry standard in propagation resistivity logging. The proven Multiple Propagation Resistivity system features a compensated four transmitter, two receiver array using two operating frequencies and fully digital electronics to produce the highest quality real-time quantitative propagation resistivity measurements in both conventional and slim holes.
Dual pairs of transmitting antennas permit long- and short-spaced measurements of phase difference and attenuation resistivities at both 2 MHz and 400 kHz frequencies. In all, the MPR tool gathers 32 raw measurements to deliver eight quantitative phase difference and attenuation resistivities and four fixed depth of investigation curves. The resulting eight resistivities support detailed quantitative and petrophysical analysis. The new, fully digital electronics and rugged, integral antenna design afford significant increases in reliability and vast accuracy improvements over previous generation propagation resistivity tools.
The 2 MHz operating frequency of the MPR tool offers improved vertical resolution for defining thin beds and bed boundaries, whilst the 400 kHz frequency enables deeper formation investigation, permitting improved bed boundary avoidance while navigating within the reservoir and providing greater immunity to environmental and formation effects. These measurements provide a comprehensive evaluation of the formation, borehole and near borehole environment.
Additional geosteering control is provided by placing an inclinometer and gamma ray scintillation detector below the MPR, positioning these measurements as close to the bit as possible. This provides improved well path control in horizontal applications. Standard directional measurements of azimuth, inclination, and tool face orientation are furnished by the directional sensor package above the MPR sub and sonde.
The MPR system addresses environmental effects using the most comprehensive data set available from any MWD resistivity tool. One of the biggest challenges for any resistivity tool is minimizing environmental effects to better measure a formation's true resistivity. These environmental effects include eccentricity, anisotropy and fluid invasion. Although it is easy to recognize the presence of environmental effects with a multiple depth resistivity tool, it is not quite as easy to differentiate between the various effects in order to apply the proper environmental corrections. The MPR system combines and compares the raw phase and amplitude-based measurements with the eight compensated resistivities to identify multiple environmental effects. Once these effects are identified and differentiated from one another, the proper corrections can be applied to the data set for improved log quality and better estimates of Rt.
Service Application The system delivers wireline-quality measurements to detect hydrocarbons and identify bed boundaries for geosteering and stratigraphic positioning applications. Our Multiple Propagation Resistivity (MPR®) system provides superior thin-bed definition, true resistivity measurements and is available in 4 ¾", 6 ¾" and 8 ¼" sizes and can be used for slimhole applications in the form of our 3 1/8" USMPR model. |
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Recommendations
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| Service Name | Benefit |
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| AutoTrak® Rotary Closed Loop System | Superior efficiency, unmatched geosteering precision and ultra-extended reach capability | | MPRTEQ Resistivity Processing | Helps quantify filtrate invasion by generating four fixed depth resistivity curves | | OnTrak System | Fully integrated system offering a full suite of directional control, formation evaluation, pressure and dynamics monitoring in the shortest possible BHA | | Reservoir Navigation Tool II | Multiple propagation resistivity measurements with deep and shallow lateral investigation of the formation | | Triple Combo Service | Combined propagation resistivity, fully compensated bulk density (rb), photelectric cross section (Pe) and formation porosity measurements | | Ultra Slim Multiple Propagation Resistivity | The benchmark for propagation resistivity logging and reservoir navigation in slimhole applications |
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