A Solidified Probe of Nuclear Magnetic Resonance Logging Tool

Abstract

The invention relates to the technical field of downhole measurement, in particular to a nuclear magnetic resonance logger curing probe. The nuclear magnetic resonance logger curing probe comprises a probe body used for measurement and a permeability shell, the permeability shell wraps the probe body, and the portion between the permeability shell and the probe body is gapless. Relatively speaking, the nuclear magnetic resonance logger curing probe has the downhole high-pressure resistance. In addition, a pressure compensation structure does not exist, oil filling and oil supplying operations are not needed in the well descending process every time, and therefore the well descending operation is easier and more convenient to conduct, and the dangers of pressing explosion do not exist.

Description

technical field [0001] The invention relates to the technical field of downhole measurement, in particular to a solidified probe of a nuclear magnetic resonance logging instrument. Background technique [0002] As we all know, the magnetic field is a necessary condition for nuclear magnetic resonance to occur. The probe sub-section is a key component of the nuclear magnetic resonance logging tool. Its function is to establish the hydrostatic magnetic field of the reservoir and transmit specific radio frequency pulses to the formation; Resonance signal, and the received nuclear magnetic resonance signal is amplified, processed and transmitted to the ground. In order to prevent the magnetic field from forming a closed magnetic field loop inside the shell, the shells of the NMR probe sub-sections are made of glass fiber reinforced plastics with good magnetic permeability. [0003] However, ordinary FRP materials do not have the ability to withstand downhole high pressure (up t...

AI Technical Summary

Problems solved by technology

Although the previous pressure compensation structure has the above functions, there are many irrationalities in its structure

For example, artificial oil injection is used for oil injection, and the amount of oil is difficult to control. There will always be situations where the silicone oil injection is unsaturated or too saturated. If the oil injection is not saturated, the silicone oil will not be able to play the role of pressure balance in the downhole, and the external pressure of the instrument is greater than that inside the instrument. pressure, the pressure compensation tube will rupture; if it is oversaturated, due to the effect of high temperature and high pressure, the silicone oil will expand, the internal pressure of the instrument is greater than the external pressure of the instrument, the pressure compensation structure will also rupture, and the liquid will enter the interior of the instrument, causing damage to the instrument

Another situation is that if the oil circulation is not complete, there are air bubbles in the instrument, and the gas expands when encountering high temperature and high pressure downhole, which will also cause the pressure compensation structure to rupture.

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