Method and system for measuring rock porosity
A technology for rock porosity and rock samples, which is used in measurement devices, suspension and porous material analysis, instruments, etc., can solve the problems of large measurement errors and low accuracy of shale porosity, and achieve the effect of improving accuracy
Active Publication Date: 2021-08-03
PETROCHINA CO LTD
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Problems solved by technology
[0007] The invention is used to solve the defects of low accuracy and large measurement error in the shale porosity determined by the gauge pressure sensor due to the daily variation of atmospheric pressure in the prior art
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[0067] In order to make the technical features and effects of the present invention more obvious, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings. The present invention can also be described or implemented in other different specific examples. The equivalent transformations done within all belong to the protection category of the present invention.
[0068] In the description of this specification, descriptions referring to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "examples", "specific examples", or "some examples" etc. mean It means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Fu...
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The invention provides a rock porosity measurement method and system, wherein the device includes: an inflatable device, a reference chamber, a sample chamber, an absolute pressure measuring device, a first valve, a second valve and a third valve; the inflatable device passes through the first The valve is connected to the inlet of the reference chamber for pressurizing the reference chamber; the outlet of the reference chamber is connected to the inlet of the sample chamber through a second valve for pressurizing the sample chamber and providing reference pressure; the sample chamber is used to accommodate rock samples; The absolute pressure measuring device is arranged on the reference chamber for measuring atmospheric pressure and absolute pressure; the third valve is arranged at the outlet of the sample chamber for adjusting the pressure in the sample chamber. The invention can avoid the influence of atmospheric pressure change on pressure measurement during the measurement process, and improve the accuracy of rock porosity measurement.
Description
technical field [0001] The invention relates to the field of oil and gas measurement, in particular to a rock porosity measurement method and system. Background technique [0002] In the prior art, the porosity of shale is generally measured by an isothermal expansion method according to Boyle's law. Due to the tightness of shale, it takes a long time (such as 6 hours) for the air pressure to balance. The diurnal variation of atmospheric pressure is an important factor affecting the accurate measurement of air pressure. Moreover, when the weather changes drastically (such as thunderstorms), even short-term pressure measurement It will also be significantly affected. For existing sensors that use gauge pressure measurement, the diurnal variation of atmospheric pressure cannot solve the influence of atmospheric pressure factors on measurement. The details are as follows: [0003] The diurnal variation of air pressure is characterized by a maximum value and a second maximum v...
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IPC IPC(8): G01N15/08G01N7/10
CPCG01N7/10G01N15/088
Inventor 田华柳少波邹才能张水昌
Owner PETROCHINA CO LTD