An ultra-small diameter three-component mems well gravity measurement device and system

Abstract

The invention discloses an ultra-small-diameter three-component MEMS gravity measurement device and system in a well, belonging to the technical field of geophysical exploration. The device comprises: three independent MEMS gravity probes placed in an orthogonal stack; It includes: a MEMS sensor (13) for gravity measurement; a constant temperature and constant pressure mechanism (12) for providing a constant temperature and constant pressure environment for the MEMS sensor (13); a servo leveling mechanism (11) for controlling The pointing of the MEMS sensor (13), so that the MEMS sensor (13) can perform downhole gravity detection and obtain a gravity signal under the condition of accurate pointing. The invention designs an ultra-small-diameter three-component MEMS gravity measurement device and system by using three independent MEMS gravity probes placed in an orthogonal vertical stack, which can be applied to a wellbore with an outer diameter of less than 50 mm and realize gravity detection at low cost; The size of the MEMS sensor (13) can be increased within the range of 50mm outer diameter, so as to improve the measurement accuracy of the MEMS gravity probe.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and more particularly relates to an ultra-small-diameter three-component MEMS gravity measuring device and system in a well. Background technique [0002] In-hole gravity measurement is a method of placing a gravimeter into a borehole to measure vertical gravity changes in gravity exploration. It is a passive density logging method. Different from the traditional surface gravity measurement, due to the small diameter of the borehole, the large depth and the filling of drilling fluid in the logging environment, the gravimeter must be small in diameter, resistant to high temperature and high pressure, and capable of automatic leveling and reading. [0003] The research on well gravity measurement and data processing began in the 1950s and was applied to reservoir prediction and evaluation in the 1960s. Since the 1960s, the United States, the Soviet Union and other countries have be...

AI Technical Summary

Problems solved by technology

In order to develop geological exploration into deep resource mining, smaller-caliber downhole instruments have become an urgent need. Traditional borehole gravimeters are not only expensive, but also unable to meet the size requirements of small-caliber boreholes for deep mineral mining.

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