High-temperature and high-pressure digital geothermal well logging system

Abstract

The invention relates to a high-temperature and high-pressure digital geothermal well logging system. The high-temperature and high-pressure digital geothermal well logging system is characterized by comprising an outer pressure bearing pipe and an inner heat insulation pipe which are coaxially arranged; one end of the outer pressure bearing pipe is completely closed by a lower instrument connector; the other end of the outer pressure bearing pipe is completely closed by an upper instrument connector; one end of the inner heat insulation pipe is closed, and the other end of the inner heat insulation pipe is closed by the upper instrument connector and a temperature sensor connector; the inner heat insulation pipe is internally provided with a measurement assembly; and the measurement assembly comprises a temperature sensor, a pressure sensor, a NaI crystal and a photomultiplier. The high-temperature and high-pressure digital geothermal well logging system can conduct well temperature well logging, pressure well logging and gamma-ray well logging at the same time, various parameters can be comprehensively measured, and the outer pressure bearing pipe and the inner heat insulation pipe each form an independent sealing cavity; and heat insulation and pressure insulation of the interior and the exterior of the inner heat insulation pipe can be achieved smoothly, the reliable working temperature range is from -10 DEG C to +250 DEG C, bearing pressure is up to 55 MPa, and well logging under high temperature and high pressure working conditions is achieved smoothly.

Description

technical field [0001] The invention relates to a logging instrument, in particular to a high-temperature digital geothermal logging system. Background technique [0002] Well logging is also called geophysical logging or mine geophysics. It belongs to one of the applied geophysical methods (including gravity, magnetism, electricity, seismic and nuclear). It uses the electrochemical properties, electrical conductivity, acoustic properties, radioactivity, etc. Geophysical properties are methods for measuring geophysical parameters. [0003] There are many logging methods, such as well temperature logging, natural gamma ray logging, neutron logging, acoustic amplitude logging, well deviation logging, formation pressure logging, etc. During well logging, various logging instruments manufactured using physical principles such as electricity, magnetism, sound, heat, and nuclear are lowered into the well through the logging cable, so that the ground electric measuring instrument ...

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Problems solved by technology

[0006] However, when the currently known well temperature logging tools and pressure logging tools are applied to the development of the above-mentioned geothermal resources and drinking water resources, due to their structural design limitations, the temperature working range of the well temperature logging tools is between -5-210°C. In the meantime, the pressure working range of the pressure logging tool is between 0-40MPa. When used in this field, problems such as failure to work normally and large errors in measurement data may occur, which cannot meet the requirements of well logging.

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