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Calculating method and measuring device for shale adsorption gas and free gas

A calculation method and gas adsorption technology, applied in measurement devices, material analysis using sonic/ultrasonic/infrasonic waves, instruments, etc., can solve the problems of damage to the integrity of pore structure, inconsistency between sample state and formation environment, etc., to ensure integrity Effect

Active Publication Date: 2016-05-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, because the isothermal adsorption experiments usually use pulverized samples below 60 mesh, the state of the samples does not match the formation environment, and the integrity of the pore structure is destroyed.

Method used

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  • Calculating method and measuring device for shale adsorption gas and free gas
  • Calculating method and measuring device for shale adsorption gas and free gas
  • Calculating method and measuring device for shale adsorption gas and free gas

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Embodiment Construction

[0027] The specific embodiments of the present invention will be described with reference to the drawings.

[0028] This embodiment is a method for measuring and determining the methane content in an isotherm adsorption experiment using the acoustic method.

[0029] Such as figure 1 As shown, the measuring device is an isothermal adsorption-sonic wave joint measuring device, including a gas cylinder 10, a reference cylinder 20, an isothermal adsorption-sonic wave joint measuring holder 30 and a sonic wave collecting device 40; on the isothermal adsorption-sonic wave joint measuring holder 30 A sound wave transmitting probe 31 and a sound wave receiving probe 32 are installed; the mud shale plunger sample is placed between the sound wave transmitting probe 31 and the sound wave receiving probe 32;

[0030] The gas cylinder 10 is connected to the reference cylinder 20 through the first pipeline 6. Valve 1 is the gas cylinder 10 switch. The first pipeline 6 is provided with a pressure ...

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Abstract

The invention relates to an oil gas detection device and a calculating method thereof, in particular to a calculating method and measuring device for shale adsorption gas and free gas. The calculating method comprises the steps that overburden pressure pore permeability measuring is performed on a mud shale plunger sample, and a calculating model representing changes of the pore volume of mud shale along with the overburden pressure is obtained; an isothermal adsorption-acoustic wave measurement experiment is performed on the mud shale sample to obtain the changing law of the acoustic wave amplitude along with the gas-contained pressure; a transformational relation between the volume of the free gas in pores and acoustic attenuation is solved according to an acoustic wave attenuation law caused by changes along with the free gas; the adsorption gas volume of methane is solved according to the relation between the gas containing quantity and acoustic attenuation and the acoustic attenuation L2 caused by the adsorption gas. According to the method, the integrality of the pore structure of the sample is guaranteed, and rock is in an overburden pressure state and better conforms to the actual condition of the rock in the stratum; the borehole acoustic wave attenuation testing law is caused through the adsorption effect of the shale to the adsorbable gas such as methane and carbon dioxide, and then the content of the free gas in the shale, the content of the adsorption gas in the shale and the proportional relation of the content of the free gas in the shale and the content of the adsorption gas in the shale are determined.

Description

Technical field [0001] The invention relates to an oil and gas detection device and a calculation method thereof, in particular to a calculation method and a measurement device of shale adsorbed gas and free gas. Background technique [0002] In order to meet the growing domestic demand for oil and gas resources, the development of conventional oil and gas resources and unconventional oil and gas has attracted much attention. Among them, the exploration and development of shale gas is increasing year by year in my country. However, in the evaluation of shale gas content, special items for free gas Research is still relatively small, which restricts the accurate evaluation of shale gas content. Studying the calculation method of free gas content in shale is of great significance for accurately evaluating shale gas content and determining the ratio of free gas content to adsorbed gas content. In seismic exploration and logging exploration, acoustic detection technology is an import...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/032
CPCG01N29/032
Inventor 孙建孟刘海涛谷铭陈德稳熊铸
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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