While-drilling well logging curve real-time comparison method

Abstract

The invention relates to a while-drilling well logging curve real-time comparison method and belongs to the technical field of horizontal well drilling. According to the technical scheme, the comparison method comprises the steps that firstly, the depths from measurement depth to vertical depth are calculated; secondly, the target layer is selected as a datum plane, the RSD (Relative Strata Depth) of a target point is calculated according to the vertical depth of the target point and the vertical depth of the datum plane, and accordingly the RSD calibration standard is built; and thirdly, a stratigraphic section is horizontally moved or rotated, and when the shape of an RSD curve of a horizontal segment is consistent with the shape of an RSD curve of a guide eye well under RSD coordinates, the stratum adjusting work is completed. The comparison method is related to the stratum shape in the correction process, so the method can be used for inspecting whether the understanding of a stratum dip angle is correct or not and used for stratum identification in the tracking process of horizontal well drilling; and by means of the comparison method, the obtained curve of the horizontal segment can be projected on a perpendicular path, the RSD calibration serves as the standard, the shape of a well logging curve of the horizontal segment and the shape of a well logging curve of the guide eye well are made to be the same, direct comparison between the curves is achieved, and the real-time performance and the accuracy of the tracking work are improved advantageously.

Description

technical field The invention relates to a real-time comparison method of logging-while-drilling curves, belonging to the technical field of horizontal well drilling. Background technique In the process of horizontal well drilling, in order to ensure that the wellbore can pass through the oil layer, it is necessary to adopt technical means such as logging while drilling. Therefore, comparative analysis of LWD curves is an extremely important link in the drilling tracking process. The traditional method of comparing well logging curves is to use the analysis method with a depth scale of MD (MeasurementDepth, sounding depth) or TVD (TrueVerticalDepth, true vertical depth, vertical depth). The abscissa draws the logging curve. The well logging curves of the pilot well (or adjacent wells) are placed vertically, and the well logging curves of the horizontal section are placed horizontally. However, in this placement method, the curves of the same formation have completely dif...

AI Technical Summary

Problems solved by technology

Therefore, the shape of the well logging curve drawn by the traditional logging interpretation method is affected by the wellbore trajectory. The shape of the logging curves of the two is completely different, and the reliability of the comparison results is not high

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