Portable nuclear magnetic resonance logging calibration device and rapid calibration method

Abstract

The invention discloses a portable nuclear magnetic resonance logging calibration device and a rapid calibration method. The device comprises a cover, a shell and an inner cavity, wherein the cover ismatched with the shell, a sealing piece is arranged between the cover and the shell, the inner cavity is filled with a simulated geological layer medium and a fluid medium, the logging calibration device comprises a plurality of standard blocks, and the standard blocks are connected with one another to form a cylinder with an annular bottom surface. According to the calibration device and method,a rock skeleton medium is simulated by adopting glass beads, a real rock core and the like, a standard block is manufactured by adopting an oil and water simulated underground hydrocarbon reservoir fluid medium, and multi-point calibration is carried out under the conditions of simulating the pore structure of underground rock and oil bearing water; the multi-point calibration device has the characteristic of portability, and calibration of a logging field instrument is realized; through unified allocation of the detachable standard blocks, the difference of nuclear magnetic resonance loggingcalibration fluid caused by field condition limitation is avoided, unified calibration between different instruments in different areas is achieved, and the ground comparison cost of the instrument measurement effect is reduced.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploration and development, and in particular relates to a portable nuclear magnetic resonance logging calibration device and a rapid calibration method. Background technique [0002] The transverse relaxation time (T 2 ) signal amplitude and transverse relaxation time spectrum of the echo train (hereinafter referred to as T 2 spectrum) is linearly positively correlated with the number of hydrogen-containing atoms in the acquisition object. In the oil and gas industry, NMR logging tools generally use CuSO 4 The calibration water tank of the solution performs single-point calibration of the instrument, that is, through the collection water tank T 2 Obtain the T2 spectral area when the water saturation is 100%, and establish T with the theoretical value 0 of the T2 spectral area when the water saturation is 0%. 2 The conversion equation between spectral area and water saturatio...

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Problems solved by technology

[0003] At present, this method has the following disadvantages: ①The medium filled in the calibration water tank is generally pure water or CuSO 4 solution, which cannot simulate the pore structure of underground rocks; ②Single-point calibration can not remove the influence of the background signal of the instrument itself; ③Single-point calibration method, a single data point has a great influence on the calibration results, and the data controllability during the calibration process is low; ④The single-point calibration method cannot accurately obtain the accuracy of the signal collected by the instrument when the water saturation is between 0%-100%; ⑤The calibration water tank cannot be calibrated at the logging site due to its large volume and weight. Due to structural limitations, it is impossible to segment the detection area of ​​the instrument and test the detection performance of the instrument in a single area

[0004] At the same time, due to the scale box CuSO 4 The solution is configured on site, and the site often does not have the ability to accurately configure a fixed concentration solution, resulting in inconsistent solutions used for instrument calibration in different regions, and it is impossible to compare the measurement results of different instruments in different regions through the unified scale of the instrument

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