Apparatus and method for measuring stratum rock physical property by rock NMR relaxation signal

Inactive Publication Date: 2006-04-26
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing nuclear magnetic resonance instruments are large in size, heavy in weight, and have high environmental requirements, so they are not suitable for use in oil fields
In addition, the existing nuclear magnetic resonance analysis method is mainly used for the analysis of molecular results of substances, and cannot be used for the analysis and measurement of petrophysical properties.

Method used

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  • Apparatus and method for measuring stratum rock physical property by rock NMR relaxation signal
  • Apparatus and method for measuring stratum rock physical property by rock NMR relaxation signal
  • Apparatus and method for measuring stratum rock physical property by rock NMR relaxation signal

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Experimental program
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Effect test

example 1

[0111] The method of the present invention is used to analyze and process 30 stratum core samples (25 mm in diameter) taken from oil fields in northern China. During the measurement, the aforementioned device of the present invention was used as a nuclear magnetic resonance measuring instrument with a resonance frequency of 3.75 MHz, a measurement echo time of 300 milliseconds, and a number of echo trains of 1024. For comparison, the physical properties of these 30 cores were also measured by conventional experimental methods. Table 2 shows the comparison of the porosity and permeability of the 30 cores obtained by conventional experimental methods with the results obtained by the nuclear magnetic resonance measuring device and measuring method of the present invention. As can be seen from the table, the processing results of the present invention are in good agreement with the results obtained by conventional experimental methods, and have good precision.

[0112] ...

example 2

[0114] The method of the invention is used to sample 8 formation cores to carry out nuclear magnetic resonance oil saturation analysis and processing. The nuclear magnetic resonance measuring instrument adopts the equipment of the present invention, and the specific parameters are: the resonance frequency is 3.75MHz, the echo measurement time is 300ms, and the number of echo trains is 1024. For the convenience of comparison, the oil saturation of these 8 cores was also measured by conventional experimental methods. Table 3 shows the comparison between the measurement results of the present invention and the oil saturation obtained by conventional measurement methods. As can be seen from the table, the processing results of the present invention are in good agreement with the results obtained by conventional measurement methods, and have good precision.

[0115]

serial number

Porosity

(%)

Permeability

(mD)

NMR oil saturation

...

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Abstract

The invention discloses a rock nuclear magnetic resonance relaxation signal measuring device of formation rock matter property, which comprises the following parts: magnet, probe, preposition amplifier, power amplifier, nuclear magnetic resonance controller and control computer, wherein the nuclear magnetic resonance controller generates specific frequency and waveshape radio frequency actuation impulse, which is sent to the nuclear magnetic resonance probe in the magnet after magnified; the rock sample is set in the exciting probe, which generates nuclear magnetic resonance backward wave signal; the nuclear magnetic resonance probe receives the backward wave signal and sends to the nuclear magnetic resonance controller after magnified, which is sent to the computer finally. The invention can generate the parameter for usage directly, which can be applied in the oil field nuclear magnetic resonance well.

Description

technical field [0001] The present invention relates to equipment and technology for material detection by nuclear magnetic resonance and material testing and analysis, in particular to a device and measurement method for measuring formation rock physical properties by using rock nuclear magnetic resonance relaxation signals. Background technique [0002] In the process of petroleum exploration and development, in order to understand the stratum, it is necessary to drill rock samples from the stratum for analysis and measurement. The rock samples drilled are generally cylinders with diameters ranging from 2.5 cm to 12 cm, commonly known as cores. Obtaining physical parameters such as pore size distribution, porosity, permeability, oil saturation, movable fluid and immovable fluid saturation of petroleum core samples is an important link to understand the reservoir situation and improve the effect of exploration and development. [0003] Typically, a well must be drilled to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/14G01N24/08
Inventor 王为民卜凡亮
Owner PEKING UNIV
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