A while-drilling natural gamma energy spectrum calibration device

Abstract

The invention relates to a natural gamma-ray spectrum calibration device while drilling. The natural gamma-ray spectrum calibration device comprises a calibration tank, filler, an element barrel and acylinder and is characterized in that the cylinder is horizontally arranged at the center inside the calibration tank, two ends of the cylinder protrude out of two ends of the calibration tank, the element barrel is arranged on the outer lateral wall of the cylinder located at the center inside the calibration tank, and the filler is filled gaps between the calibration tank and the cylinder and inside the calibration tank. The natural gamma-ray spectrum calibration device has the advantages that the device is well applicable to a natural gamma-ray spectral instrument while drilling; the device adopts the structure free of a magnetic steel cylinder, strength is guaranteed, and magnetic material interference is lowered; the structural form and proportion of the mixed medium in the calibration device are applicable to the natural gamma-ray spectral instrument while drilling; a shielding protecting material is added to protect the personal health of operators; the KCl compound serving asthe gap filler is helpful to the calibration result of the natural gamma-ray spectral instrument while drilling.

Description

technical field [0001] The invention relates to the field of radioactivity measuring equipment, in particular to a natural gamma ray spectrum calibration device while drilling. Background technique [0002] With the continuous increase of highly deviated wells and horizontal wells, traditional logging methods can no longer meet the construction needs, so logging-while-drilling technology adapted to horizontal wells has developed rapidly. The application of LWD technology in foreign countries has been very common, while the LWD research in my country started relatively late, seriously lagging behind developed countries. The natural gamma ray spectrum logging tool while drilling is mainly used to judge formation lithology in the drilling construction of directional wells and horizontal wells. It is an indispensable equipment in the logging while drilling series of tools and has a wide application prospect. [0003] Natural gamma ray spectral logging is a logging method for re...

AI Technical Summary

Problems solved by technology

[0007] 1. The existing scale devices (yellow cloth, scale frame, scale tiles) are mainly designed to be used in traditional cable natural gamma ray spectroscopy instruments, and are not completely suitable for drilling while drilling natural gamma ray spectroscopy instruments

[0008] 2. The content of potassium, uranium and thorium elements in the existing calibration devices (yellow cloth, scale frame, and scale tiles) is relatively low, and the peak values ​​of potassium, uranium, and thorium in the curves measured by the instrument during the calibration process are not obvious, especially The uranium value is low, which affects the calibration effect;

[0009] 3. The existing scale devices (yellow cloth, scale frame, and scale tiles) are generally small, and are easily disturbed by external environmental factors;

[0010] 4. The existing scale device (yellow cloth, scale frame, scale tile) has no shielding protection measures, and the uranium and thorium elements in the scale device are radioactive elements, which are harmful to operators

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