A method for testing the accuracy of a borehole imager

Abstract

The invention discloses a precision inspection method for a drilled hole imaging instrument. The precision inspection method is characterized that the precision inspection method comprises steps that the attitude of cracks in a simulated drilled hole is actually measured, and the imaging instrument is used for testing the simulated drilled hole and analyzing the crack attitude in the hole; and the precision inspection method further comprises the step that the analyzed attitude and the actual attitude are compared so as to determine the attitude analyzing precision of the imaging instrument. By adopting the method, the defect that the precision of the imaging instrument is determined only by statically inspecting a positioning device in the prior art is overcome. According to the inspection method, the comprehensive performance of a whole imaging system including hardware and software instead of a certain element of the imaging instrument or the precision of a certain calculation method is inspected, and the precision is obtained only based on an ideal model in the prior art.

Description

technical field [0001] The invention relates to the logging field of geotechnical investigation, in particular to a method for checking the accuracy of a borehole imager. Background technology [0002] In all kinds of investigation, especially in underground engineering investigation, the occurrence of rock fissures is the focus of attention. Through the borehole imaging test of the exploration hole, the fracture occurrence exposed in the borehole can be analyzed by using the software matched with the imager. However, due to the different accuracy of various imagers and different magnetic declination angles, there will be some errors between the analyzed occurrence and the actual occurrence. For the quantification of such errors, there is a lack of relevant methods and devices in actual production. [0003] According to the search of the existing technology, the existing technical documents closest to the invention show that the existing method for checking the accuracy of the bo...

AI Technical Summary

Problems solved by technology

[0003] According to the retrieval of the prior art, the prior art document closest to the present invention shows that the existing method for inspecting the accuracy of the borehole imager mainly uses static detection of the positioning accuracy of the positioning device in the probe of the imager, and this method can only inspect the imaging The positioning accuracy of the instrument in the static state cannot be checked for the positioning accuracy in the working state

In addition, the occurrence analyzed by the supporting software of the imager is based on an ideal mathematical model, and there is still a lack of relevant quantitative methods for the error between the analyzed occurrence and the actual occurrence.

Field test conditions, such as the impact of different lowering probe speeds on test results, also lack data support

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