Abstract：The electromagnetic wave measurement while drilling tool in the directional well mining identifies the drilled formation and the formation to be drilled, and ensures the bit in a right tracjectory, so the oil and gas recovery will be greatly improved.We conduct a study on the electromagnetic wave measurement while drilling tool in inclined wells.The following understandings are obtained:①The distance from the surrounding rock layer to the target can be judged by the positive or negative of the directional response signal; ②The influence of formation inclination and formation anisotropy on the directional response can be reduced or eliminated with symmetric coil arrangement for measurement.The directional measurements of two pairs of single emissing and single receiving coil system should be superimposed together.When the tool is located near the formation boundary, the directional response signal is only sensitive to the inclination, and when the tool is far from the formation boundary, the directional response signal is less affected by anisotropy and inclination, and the directional response curve is simple; ③A numerical simulation for the directional measurement response of formation dip angle less than 20° is carried out.If the target thickness is less 6m, the geo-steering signals are very sensitive to well dip angle.The proposed method has a high real-time measurement accuracy and compensates the shortage of the current borehole imaging.
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