Design and packaging of high-temperature-resistant and strong-vibration-resistant scintillator for logging while drilling

Abstract

The scintillator comprises a scintillator packaging shell, an optical window, a scintillator, a scintillator light emitting surface, a scintillator rear end surface, a scintillator side surface, an optical vibration reduction layer, a transparent coupling medium, a side surface light reflection layer, a first side surface vibration reduction assembly, a second side surface vibration reduction assembly, a scintillator rear end reflection layer, a rigid metal plate, a rigid vibration reduction device, a rear cover and an inert gas and high temperature soldersealing interface, a laser welding seam is formed between the rear cover and the scintillator packaging shell, the scintillator is alkali metal halide or rare earth halide, and the scintillator is one of cerium-doped lanthanum bromide, cerium-doped lanthanum chloride, thallium-doped sodium iodide and sodium-doped cesium iodide; the reserved space for thermal expansion of the scintillator and the packaging internal material prevents the scintillator from being damaged by high temperature, and inert gas is filled in the gap, so the influence of oxygen in the air on the reflecting material and the light guide material under the condition of high temperature can be effectively reduced, and stability of the light output performance of the scintillator is ensured.

Description

technical field [0001] The invention relates to the field of packaging scintillators for nuclear logging applications, in particular to the design and packaging of a high-temperature-resistant and strong-vibration-resistant scintillator for logging-while-drilling. Background technique [0002] Nuclear logging technology is one of the cutting-edge logging technologies developed rapidly with the development of contemporary nuclear technology and the needs of petroleum, coal, geological minerals, etc. for the development of nuclear logging technology. Detectors with deliquescent scintillators such as cerium-doped lanthanum bromide and thallium-doped sodium iodide as the core detection components are loaded in well logging instruments and are widely used in oil well logging or other similar places. The rays emitted from the formation around the wellbore act to obtain the physical parameters of the formation, and then provide a basis for exploration analysis. [0003] Resources ...

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Problems solved by technology

[0004] However, the conventional scintillator packaging design cannot guarantee its stable and reliable operation in the complex environment of well logging: air is filled in the internal void of the package, which will easily cause the performance aging of internal components with the prolonged working time at high temperature; due to the lack of effective vibration reduction Unreasonable structural design or vibration damping design will easily lead to crystal or window cracking or extra invalid counts during vibration, resulting in statistical errors in counting rates. Therefore, a scintillator with high temperature resistance and strong vibration resistance for logging while drilling is proposed. Design and Packaging

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