Production logging multi-arm caliper inclined shaft correction processing method

Abstract

The invention discloses a production logging multi-arm caliper inclined shaft correction processing method. The method includes the following steps that 1, filtered data B40FilterDepth is acquired; 2, the filtered data B40FilterDepth obtained in the step 1 is subtracted from original data B40Depth to obtain a relative variable B40ResDepth; 3, five-point median filtering is carried out on L caliper measuring values of the relative variable B40ResDepth, and then ellipse fitting is carried out to obtain fitting parameters, wherein the fitting parameters include the length, the minor axis and the eccentric distance of the ellipse; 4, ellipse correction is carried out on the relative variable B40FilterDepth according to the fitting parameters obtained in the step 3 to obtain a corrected relative variable B40DEVCorrDepth; 5, the corrected relative variable B40DEVCorrDepth is added with the relative variable B40ResDepth, and an addition result serves as a production logging multi-arm caliper inclined shaft correction result. By means of the method, accurate production logging multi-arm caliper inclined shaft correction can be achieved.

Description

technical field [0001] The invention belongs to the field of petroleum development and engineering, and relates to a method for correcting and processing multi-arm well diameter deviated wells in production logging. Background technique [0002] With the development of production logging technology, multi-arm caliper tools are widely used in the detection of casing damage and distortion. Multiple borehole caliper values ​​are measured along the well circumference at each depth point. Using the measured borehole caliper values, the distortion and deformation of the casing can be reflected intuitively. When measuring, it is generally necessary to add a centralizer to ensure that the instrument is centered, so that the measured data does not need to be corrected. [0003] However, in the case of poor well conditions, centralizers cannot be added during instrument measurement, and eccentricity occurs during measurement. In addition, there are more and more deviated wells and h...

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Problems solved by technology

[0003] However, in the case of poor well conditions, the centralizer cannot be added to the instrument during measurement, and there will be eccentricity during measurement.

In addition, there are more and more deviated wells and highly deviated wells. Even if centralizers are added, it is difficult to ensure that the instrument is centered due to the weight of the instrument. In these two cases, correction processing is required to reflect the real casing deformation.

[0004] However, the casing is not deformed, but the "casing deformation" caused by the eccentric measurement of the instrument and the distortion of the casing. It is difficult to distinguish the real "casing deformation" measured by the center of the instrument. If the elliptical The fitting correction process will miscorrect the eccentricity caused by the distortion of the casing, which is not conducive to the subsequent casing damage interpretation

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