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

A technology of nuclear magnetic resonance and relaxation signals, which is applied in electron magnetic resonance/nuclear magnetic resonance detection, nuclear magnetic resonance analysis, etc., can solve problems such as inability to analyze and measure petrophysical properties, unsuitable for oil field use, and high environmental requirements , to achieve the effect of fast calculation speed, light weight and simple equipment

Inactive Publication Date: 2008-03-05
PEKING UNIV
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  • Summary
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  • Application Information

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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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example 1

[0112] The method of the present invention is used to analyze and process 30 formation core samples (25 mm in diameter) taken from China North Oilfield. In the measurement, the aforementioned device of the present invention was used as a nuclear magnetic resonance measuring instrument, the resonance frequency was 3.75 MHz, the echo time was 300 milliseconds, and the number of echo trains was 1024. For the convenience of 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 the conventional experimental method with the results obtained by the nuclear magnetic resonance measuring device and measuring method of the present invention. It can be seen from the table that the processing results of the present invention are in good agreement with the results obtained by the conventional experimental method, and have good precision.

[0113...

example 2

[0117] By adopting the method of the present invention, 8 formation cores are sampled for 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 measurement echo 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 presents the comparison between the measurement results of the present invention and the oil saturation obtained by the conventional measurement method. It can be seen from the table that the processing results of the present invention are in good agreement with the results obtained by the conventional measurement method, and have good precision.

[0118] Table 38 Formation core NMR oil saturation results

[0119]

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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 invention relates to equipment and technology for material detection and material testing and analysis using nuclear magnetic resonance, in particular to a device and a measuring method for measuring formation rock physical properties using rock nuclear magnetic resonance relaxation signals. Background technique [0002] In the process of petroleum exploration and development, in order to understand the formation, it is necessary to drill rock samples from the formation for analysis and measurement. The drilled rock samples 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 conditions and improve the effect of exploration and development. [0003] Typically, a well is drilled to obtain a...

Claims

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Application Information

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