Borehole compensated resistivity logging tool having an asymmetric antenna spacing
A resistivity, logging-while-drilling technology, which is applied in electrical/magnetic detection for logging records, borehole/well components, and electromagnetic wave detection, etc., can solve problems such as calibration errors, achieve accurate drilling compensation, The effect of total tool length reduction
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[0019] figure 2 An exemplary embodiment of a LWD resistivity tool 100 according to the present invention is shown. The resistivity tool 100 includes a plurality of spaced apart transmitters T disposed about a tool body 110 1 , T 2 and T 3 and a pair of spaced receivers R 1 and R 2 . Transmitter T 1 , T 2 and T 3 can be considered asymmetric since they are deployed on the receiver pair R 1 and R 2 on one axial side of and since there is no corresponding symmetrical transmitter deployed on the opposite axial side of the receiver. In contrast to the prior art resistivity tool 50 shown in FIG. 1, the present invention does not include a second set of symmetrical emitters. The resistivity tool 100 also includes a pair of symmetrical compensation transmitters CT 1 and CT 2 . exist figure 2 In the exemplary embodiment shown, these compensating transmitters CT 1 and CT 2 Axially deployed on the receiver pair R 1 and R 2 between. Although the invention is not limite...
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