Adsorption phase methane density testing device and adsorption phase methane density testing method
A test device and phase methane technology, applied in measuring devices, specific gravity measurement, instruments, etc., can solve the problems of low accuracy of shale adsorbed gas content, no accurate acquisition method of adsorbed phase methane, etc., and achieve the goal of improving prediction accuracy Effect
Active Publication Date: 2022-05-27
PETROCHINA CO LTD
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[0004] However, there is no accurate method for obtaining the density of methane in the adsorbed phase, resulting in low accuracy in predicting the adsorbed gas content of shale
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[0067] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.
[0068] First, briefly introduce the terms involved in the embodiments of this application:
[0069] Shale gas is an unconventional natural gas. Shale gas is usually deposited on shale, specifically, in natural fractures and voids in a free state; or, in an adsorbed state on the surface of kerogen and clay particles; or, in a dissolved state in kerogen and asphaltenes middle. In this case, the adsorbed shale gas accounts for 20% to 80% of the total gas content of the shale gas. The main source of shale gas is methane.
[0070] Adsorption refers to the phenomenon that a component or components in the fluid accumulate on the surface of the solid when the fluid is in contact with the porous solid. At this time, the solid is called the ads...
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Abstract
The invention relates to an adsorption phase methane density testing device and an adsorption phase methane density testing method, and relates to the technical field of oil and gas field development. The device comprises a laser transmitter, an experiment table state control system, an experiment table and a laser receiver. When an experiment is carried out, firstly, when a first sample and a second sample are in a preset gas state, laser passes through a first laser position on a laser receiver where a first convex lens and a second convex lens are located, and then when methane is filled between the first sample and the second sample, the laser passes through a second laser position on a laser receiver where the second convex lens is located; and the laser passes through a second laser position on the laser receiver where the first convex lens and the second convex lens are located according to the distance between the first position and the second position. And determining the density of the adsorbed methane. According to the method for determining the path change of the laser through the position change of the laser and determining the density change of the medium in the path, a direct measurement method for the density of the methane in the adsorption phase is provided, and the prediction accuracy of the shale gas adsorption amount is improved.
Description
technical field [0001] The application relates to the technical field of oil and gas field development, and in particular, to an adsorption phase methane density testing device and an adsorption phase methane density testing method. Background technique [0002] Shale gas is natural gas existing in shale layers, and its composition is mainly methane. Shale gas mainly exists in shale in the form of adsorbed phase and free phase, and the proportion of different forms of shale gas in the total gas content of shale is uncertain. content is determined. [0003] In the related art, the amount of methane adsorbed by shale is usually calculated by the method of isothermal adsorption experiment and the formula corresponding to Boyle's law, and the isotherm adsorption line of methane adsorbed in shale is drawn. Since methane is in a supercritical state in the experiment, and according to the Gibbs adsorption theory, when the pressure exceeds the pressure threshold, the obtained adso...
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IPC IPC(8): G01N9/24
CPCG01N9/24
Inventor 李农蔡长宏安珏东王丽何家欢陈洪斌陈曼霏蒲治锦王维赵丹
Owner PETROCHINA CO LTD