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This invention relates to electromagnetic logging technology and discloses a forward-focusing electromagnetic logging method while drilling, comprising two stages: (1) Pre-testing stage: using a magnetic ring antenna array arranged in a straight line along the drill collar, the last antenna is used as a reference antenna to transmit signals, and the preceding antennas simultaneously receive them, so as to synchronously acquire the amplitude and phase delay of the received signals of each preceding antenna. (2) Forward focusing stage: configuring the transmission parameters for the preceding antennas, setting their initial phase to the negative value of the measured phase delay, and calculating an inversely proportional weighting coefficient based on the received amplitude, thereby configuring the driving amplitude of each preceding antenna; finally, driving the reference antenna and the configured preceding antennas to transmit synchronously, and coherently superimposing them in front of the drill bit to form a focused beam, while weakening the signal interference from the instrument's sides and back to the formation. This invention does not require pre-setting equipment in un-drilled formations, is fully compatible with existing instruments, and can significantly improve the signal strength and signal-to-noise ratio of forward detection.

The application provides a service condition-based indentation prediction method for mechanical properties of a hydrogen conveying pipeline in service, hydrogen permeation testing is performed on the pipeline after sample processing in a hydrogen environment, steady-state hydrogen permeation flux and effective hydrogen diffusion coefficient of the hydrogen conveying pipeline material to be tested are obtained, a finite element model is established based on the steady-state hydrogen permeation flux and the effective hydrogen diffusion coefficient of the hydrogen conveying pipeline material, and the mechanical properties of the pipeline are predicted based on the adjusted parameters for hydrogen environment mechanical testing on the tensile sample and the fracture toughness sample; indentation testing is performed on the pipeline by using the indentation method to obtain the mechanical properties of the pipeline, the actual mechanical properties of the pipeline can be obtained based on the predicted mechanical properties of the pipeline and the mechanical properties of the pipeline obtained by the indentation testing, the mechanical property parameters of the pipeline can be quickly and accurately obtained, the mechanical properties of the hydrogen conveying pipeline to be tested in the actual service environment can be truly reflected, the prediction result is closer to the real data, and the method has engineering practicability.