Horizontal well logging while drilling and ranging radar echo signal processing method

Abstract

The present application discloses a method for processing radar echo signals of horizontal wells ranging with drilling, including the following steps: Step 1, performing sliding average filtering on the radar echo signals, wherein the radar echo signals include direct wave signal components and reflected wave signal components; step 2, carry out Fourier transform to the signal obtained in step 1, and convert it from time domain to frequency domain; step 3, carry out bandpass filtering to the signal; step 4, obtain step 3 Carry out inverse Fourier transform of the signal to convert it from the frequency domain to the time domain; step 5, amplify the reflected wave signal component in the signal obtained in step 4; step 6, for the signal obtained in step 5, obtain the The peak time difference between the direct wave signal component and the reflected wave signal component is used for layer detection and ranging.

Description

technical field [0001] The present invention relates to the field of oil and natural gas drilling, and in particular to a method for processing radar echo signals used in horizontal wells while drilling. The echo signal of the layer boundary is processed to obtain the key characteristic information of the weak reflected wave signal generated at the interface of the reservoir in the echo, and finally realize the boundary detection of the oil layer, coal seam, and other reservoirs. This technology is a horizontal well drilling while drilling One of the core technologies of layer ranging radar. Background technique [0002] With the continuous development of the petroleum industry and the increasing difficulty of oil and gas exploration and development, the oil exploration and development industry has gradually turned to the development of oil and gas reservoirs with small scale, thin oil and gas layers, poor physical properties and strong heterogeneity, directional wells, hori...

AI Technical Summary

Problems solved by technology

At the same time, due to the inhomogeneity of the medium in the formation, the propagation process of the radar wave becomes very complicated, and the interference to the radar wave is also very serious, resulting in severe attenuation and distortion, so that the useful reflected wave signal is submerged in the noise , and difficult to identify

If only the weak radar reflection signal is detected and identified through the hardware circuit, it is far from meeting the requirements

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