Internal temperature simulation method for borehole gravimeter system

Abstract

The invention discloses an internal temperature simulation method for a borehole gravimeter system, and belongs to the field of logging instruments, and the method comprises the steps: S1, drawing a system geometric model according to the internal structure of the borehole gravimeter system, wherein the system geometric model comprises an inner layer temperature control module, a displacement detection circuit, a skeleton and a vacuum bottle; S2, endowing each computational domain in the system structure model with different material attributes so as to establish a heat transfer physical field model; S3, analyzing the temperature gradient of an area where the MEMS chip in the inner layer temperature control module in the heat transfer physical field model is located; and S4, when the inner layer temperature control module works stably, analyzing the temperature gradient to obtain the temperature rise condition of the heat generated by the environment on the borehole gravimeter system, and obtaining a temperature simulation result of the borehole gravimeter system. The problem that a constant-temperature environment cannot be guaranteed is avoided through modeling simulation, the temperature simulation result of the borehole gravimeter system can be accurately analyzed, and the temperature simulation result can provide reference for actual measurement, so that the measurement precision is improved.

Description

technical field [0001] The invention belongs to the field of well logging instruments, and more specifically relates to an internal temperature simulation method of a gravimeter system in a well. Background technique [0002] The borehole gravimeter is a kind of relative gravimeter, which can carry out relative measurement of gravity, and is of great significance in the fields of mineral resource exploration and oil and gas reserve monitoring. Temperature will have a certain impact on the measurement accuracy of the instrument, so it is very important to study the temperature distribution inside the instrument. [0003] In the actual downhole measurement process, the ambient temperature around the instrument will rise by 3°C every time the instrument is lowered by 100 meters. The gravimeter in the well of the present invention is prepared by MEMS processing technology to obtain a high-precision silicon-based spring-vibrator structure, which can realize high-precision gravit...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides an internal temperature simulation method of the gravimeter system in a well, the purpose of which is to analyze the area where the MEMS chip is located by drawing the geometric model of the system and establishing a physical field model of heat transfer. temperature gradient, and further deduce the temperature rise of the gravimeter system in the well to obtain the temperature simulation results, thereby solving the technical problem of low measurement accuracy in the prior art due to the lack of guarantee of the constant temperature environment

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