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• W2073898041 abstract "ABSTRACT A drilling mechanics sub has been developed to measure the dynamic collar forces, accelerations, and fluid pressures just above the bit. These quantities can be transmitted to surface using mud pulse telemetry to provide the driller with real time information about downhole conditions. The measurements have been obtained for the first time on two directional wells in the Gulf of Mexico. On the first well the sub was run in a rotary drilling assembly in the inclined section. On the second well the sub was run behind a steerable system on the build and tangent section of the well. The bending moment measurements gave a detailed description of the well trajectory each time a course correction was made; during jetting operations for the first well, and during oriented and rotary drilling using the steerable motor for the second well. Relatively high transverse acceleration levels were found to be associated with the doglegs of the wells, while relatively low axial acceleration levels were associated with drilling the soft shale formations. The transverse vibrations were shown, for the particular assemblies used, to vary almost linearly with rotary speed for the range studied. However, the transverse vibrations, as well as the bending moment were shown to be sensitive to downhole boundary conditions, especially in open hole sections. On each well measurements were made, at various flow rates, of the differential pressure across the components below the measurement sub; the bit for the first well, and a positive displacement motor plus the bit for the second well. From this data inferences could be drawn concerning pump efficiency and calibration of the downhole weight on bit measurement. In addition, measurement of the differential pressure can be seen as a potential aid in the identification of drillstring washouts, erosion or blocking of nozzles, and bearing wear in downhole motors." @default.
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• W2073898041 date "1989-02-28" @default.
• W2073898041 modified "2023-09-27" @default.
• W2073898041 title "First Real Time Measurements of Downhole Vibrations, Forces, and Pressures Used To Monitor Directional Drilling Operations" @default.
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• W2073898041 doi "https://doi.org/10.2118/18651-ms" @default.
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