Sealed shale gas flow testing method and device

A technology for testing devices and air intake devices, which is applied in measurement devices, suspension and porous material analysis, instruments, etc., can solve the problems of underestimating permeability, ignoring adsorption effects, and inability to characterize seepage characteristics, achieving a high degree of automation and data The effect of automatic monitoring

Pending Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] There are problems with the above experimental methods: (1) Under the confining pressure, the conventional steady-state seepage test method, unsteady-state pulse decay method and mercury injection method will not desorb shale, which ignores the influence of adsorption effect and underestimates its permeability; (2) Permeability is the property of rock itself, so it does not change with pressure and gas flow type, but the gas slippage effect is very obvious at low pressure microscale; ③The seepage characteristics under different pore pressures cannot be characterized

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  • Sealed shale gas flow testing method and device
  • Sealed shale gas flow testing method and device
  • Sealed shale gas flow testing method and device

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] Such as figure 1 As shown, a closed test device for shale gas flow includes a high-pressure nitrogen gas inlet device 1, a high-pressure natural gas inlet device 2, a first six-way valve 3, a booster pump 4, a second six-way valve 6, an evacuation Device 5, constant temperature box 7, core flow model 8, differential pressure sensor 9, buffer 10, ring pressure control pump 11 and bidirectional displacement pump 12;

[0035] The high-pressure nitrogen inlet device 1 and the high-pressure natural gas inlet device 2 are connected to the second six-way valve 6 after passing through the first six-way valve 3 and the boos...

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Abstract

The invention discloses a sealed shale gas flow testing method and device. The method includes the following steps that shale gas reservoir rock is collected, a natural core is manufactured, physical property parameters are tested, and gas reservoir static feature parameters are collected; a simulation device is installed to fill the core; the device is vacuumized, the device is filled with natural gas till formation pore pressure (formation pressure) confining pressure is gas reservoir overburden pressure; the temperature of a constant-temperature box is increased to a specific temperature; the experimental process starts; pressure difference generated during seepage of gas in the core under different flows is tested under an original formation condition, and a seepage feature curve is drawn. Shape gas flow seepage characteristics in the gas reservoir development process are researched through a physical simulation method, and seepage capacity of shale gas is measured.

Description

technical field [0001] The invention relates to the technical field of shale gas reservoir development and analysis, in particular to a test method and device for closed shale gas flow. Background technique [0002] Shale gas reservoirs are ultra-low porosity, ultra-low permeability multi-scale dual media, and unconventional gas reservoirs with various flow characteristics such as adsorption / desorption / diffusion / flow. The storage and seepage structure belongs to the order of nanometer and micron and has strong multi-scale, and has a special microscopic storage structure and complex seepage mechanism. Shale permeability is a physical quantity that characterizes gas migration ability. It is not only an extremely important factor affecting the effective development of shale gas wells, but also an important parameter for reservoir evaluation, development scheme design, numerical simulation and productivity evaluation. [0003] Currently, there are steady-state method, unsteady-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 杨文新赵江艳
Owner CHINA PETROLEUM & CHEM CORP
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