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A method for testing the accuracy of a borehole imager

A technology of drilling imaging and inspection methods, which is applied in construction and other fields, can solve the problems of inability to inspect positioning accuracy, lack of quantification methods, lack of data support for test results, etc., and achieve the effect of convenient and accurate test accuracy

Active Publication Date: 2020-12-08
HEBEI GEO UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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

Method used

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  • A method for testing the accuracy of a borehole imager
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  • A method for testing the accuracy of a borehole imager

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Embodiment Construction

[0020] The invention is described in further detail below in combination with the accompanying drawings and specific embodiments.

[0021] The invention simulates a section of borehole containing several fractures, first uses the compass to measure the actual occurrence of these fractures, then uses the borehole imager to test the simulated borehole, analyzes the occurrence of these fractures through the supporting software of the imager, and compares the analyzed occurrence with the actual occurrence, so as to determine the accuracy of the occurrence analyzed by the borehole imager.

[0022] See attachment Figure 1 and Figure 2 The drilling simulation device comprises a wooden base 1 (of course, other materials can also be used to meet the use requirements) and a bracket 2 arranged on the wooden base 1 for placing the simulated drilling hole wall 3.

[0023] Among them, the specifications of wooden base 1 are: length, width and thickness are 3.0m, 0.1M and 0.02M respectively. The...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/002
CPCE21B47/002
Inventor 于开宁李健付浩
Owner HEBEI GEO UNIVERSITY
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