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Gasometric porosity measuring method taking temperature effect into consideration

A measurement method and technology of temperature effect, applied in measurement devices, analysis of suspensions and porous materials, instruments, etc., can solve the problems of porosity measurement error, difficult to achieve constant temperature, etc.

Active Publication Date: 2015-06-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is often difficult to achieve constant temperature in the true sense under laboratory measurement conditions.
Therefore, temperature changes from the beginning of gas diffusion into the core chamber to final gas pressure equilibrium must produce porosity measurement errors

Method used

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  • Gasometric porosity measuring method taking temperature effect into consideration
  • Gasometric porosity measuring method taking temperature effect into consideration
  • Gasometric porosity measuring method taking temperature effect into consideration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: Take the measurement of sandstone core porosity as an example.

[0050] A gas porosity measurement method considering the temperature effect, using porosity measurement equipment to measure porosity, such as figure 1 As shown, the porosity measurement equipment includes a gas source bottle 5, an air pressure control device 3, an air pressure fine-tuning device 6, a known gas chamber 7 and a rock core chamber 9, and the gas source bottle 5 is connected to a gas source bottle decompression device 1, Control the maximum measured air pressure of the measuring equipment; the gas source bottle decompression device 1 is connected with a gas source communication valve 2 to control the on-off of the gas source; the gas source communication valve 2 is connected with the air pressure fine-tuning device 6 and the air pressure control device 3 in turn , wherein, the air pressure control device 3 controls the general air pressure, and the air pressure fine-tuning device...

Embodiment 2

[0096] Embodiment 2: Taking the measurement of the porosity of carbonate rock as an example, in this implementation, the measurement method and equipment of the porosity are the same as in Embodiment 1.

[0097]According to the porosity measurement method in Example 1, the measurement was repeated 7 times, and the porosity obtained by each measurement, the porosity after considering the temperature effect in this embodiment, and the temperature at the beginning and end of the measurement were respectively recorded.

[0098] The experimental data are shown in the table below:

[0099]

[0100] From the above experimental data, it can be seen that in terms of stability, the variance of the 7 measurement results without considering the temperature effect is 0.0178, and the variance of the 7 measurement results after considering the temperature effect is 0.0011; in terms of accuracy, the 7 measurement results without considering the temperature effect The average value of is 14...

Embodiment 3

[0103] Embodiment 3: Taking the porosity measurement of volcanic rock as an example, in this implementation, the porosity measurement method and equipment are the same as in Embodiment 1.

[0104] In order to accurately verify the application effect of the present invention, in this embodiment, when the porosity is measured in the laboratory, the temperature of the air conditioner is adjusted to 30°C on the basis of the room temperature being 18.01°C, and it is considered that the temperature is continuously rising during the measurement process.

[0105] According to the porosity measurement method in Example 1, the measurement was repeated 7 times, and the porosity obtained by each measurement, the porosity after considering the temperature effect in this embodiment, and the temperature at the beginning and end of the measurement were respectively recorded.

[0106] The experimental data are shown in the table below:

[0107]

[0108]

[0109] From the above experiment...

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Abstract

The invention relates to a gasometric porosity measuring method taking temperature effect into consideration and belongs to the field of laboratory core porosity measurement. The method which is based on the equation of state of ideal gas includes the steps of 1, considering temperature changes during measurement, and acquiring unknown gas chamber volume V according to balance pressure P measured; 2, calibrating known gas chamber volume Vk and pressure change coefficient G of a measuring system; 3, determining core frame volume; 4, determining core porosity. The method has the advantages that the influence of temperature effect upon core gasometric porosity is considered, the porosity defect of the Boyle's law is made up theoretically, and a theoretical plate for volume relation of temperature effect factors and core frame is compiled, the measurement requirements of the method are fully implemented, and thus rock physics basis is more perfect and prediction precision is higher.

Description

technical field [0001] The invention belongs to the field of laboratory rock core porosity measurement, and in particular relates to a gas porosity measurement method considering temperature effect. Background technique [0002] In petrophysics, porosity is one of the basic parameters of cores and is widely used in reservoir evaluation. In laboratory measurement, compared with other core parameters, the measurement of core porosity has more measurement methods, and the common ones are: saturation weighing method, nuclear magnetic measurement method, image statistics method, gas measurement method, etc. Among these methods, the saturation weighing method is more accurate, but the process is long, and there are shortcomings such as difficulty in monitoring the saturation state of the core, and systematic errors in weighing; due to equipment noise interference and other reasons, the measured porosity of the nuclear magnetic measurement method is often higher than that of the co...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N7/00
Inventor 邓少贵牛云峰葛新民范宜仁张艳严杰王世兴赵岳庄东志
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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