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Device for measuring permeability of porous deposit sediments containing hydrates

A technology containing hydrate and permeability, which is used in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., to achieve the effect of easy sampling and analysis, easy disassembly and assembly

Active Publication Date: 2013-12-25
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For porous sediments containing hydrates, due to the influence of the stable conditions of hydrates (low temperature, high pressure), conventional permeability measuring instruments cannot be used for measurement, and special experimental devices need to be developed

Method used

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  • Device for measuring permeability of porous deposit sediments containing hydrates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A device for measuring the permeability of hydrate-containing porous sediments, including a one-dimensional high-pressure reactor 1 for hydrate formation and permeability measurement, and porous sediment 2 is flushed into the high-pressure reactor 1 for buffering gas and Accurately calibrate the stabilized gas supply module of the gas volume injected into the high pressure reactor 1, the stabilized pressure liquid supply module used to precisely control the volume of the solution injected into the high pressure reactor 1, the constant temperature water bath module used to provide a constant temperature environment, and adjust the pressure of the high pressure reactor 1 The back pressure control module, as well as the data acquisition and processing module.

[0022] The stabilized gas supply module includes a high-pressure gas source 4 and a gas storage tank 10 connected in sequence, a pressure reducing valve 5 is connected between the high-pressure gas source 4 and the g...

Embodiment 2

[0029] Determination of Absolute Permeability in Liquid Phase

[0030] use figure 1 The permeability device shown first generates the desired hydrate saturation system. During the generation process, the advection pump 12 is used to inject the solution 11 into the reaction kettle 1 for many times, so that the gas in the system can basically be completely converted into hydrates, that is, the reaction kettle 1 only contains the hydrate phase and the liquid phase at the end of the generation, and the gas phase content can be omitted. When the system pressure is reduced to the specified requirement, adjust the pressure of the back pressure valve 5 and set it to a constant pressure state so that it is much higher than the system equilibrium pressure, then open the inlet and outlet valves of the reactor 1, and the advection pump 12 passes through the cooling coil 13 Water is injected at a constant and small flow rate to prevent the cooling coil 13 from being too large in time to ...

Embodiment 3

[0032] Determination of gas phase absolute permeability

[0033] use figure 1 For the permeability device shown, the gas-water ratio is increased at the initial moment, or the amount of gas is replenished to the reactor 1 several times during the generation process, so that the water in the reactor 1 can be completely converted into hydrates. After the hydrate is formed, adjust the pressure reducing valve 5 and use the high-pressure gas source 4 to inject methane gas at a certain pressure into the gas storage tank 10 . Then close the pressure reducing valve 5, open the inlet valve of the reactor 1, make the reactor 1 communicate with the gas storage tank 10, the pressure of the reactor 1 and the gas storage tank 10 will gradually reach equilibrium, then open the outlet valve, slowly reduce the back pressure Valve 15 pressure, use the excess gas in the kettle to displace the residual free water in the reaction kettle 1. Repeat this several times until there is basically no fr...

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Abstract

The invention relates to a device for measuring the permeability of porous deposit sediment containing hydrates. The device comprises a stable-pressure gas supplying module, a stable-pressure liquid supplying module, a constant-temperature water bath module, a back pressure control module and a data acquiring and processing module. A reaction kettle is located in a constant-temperature water bath and the constant-temperature water bath is used for carrying out temperature control; gas and liquid are accurately and quantitatively injected into the reaction kettle by the stable-pressure gas supplying module and the stable-pressure liquid supplying module; deposit sediment systems with different hydrate saturation degrees can be generated by accurately controlling injected gas amounts and liquid amounts; a system pressure and a pressure difference are measured by a specially-made pressure measuring pipe; the pressure measuring pipe is saturated by a fluid medium which is not iced at the temperature of more than -20 DEG C and is sealed by using an elastic pressure guiding film; the back pressure control module controls the pressure of the reaction kettle and is cooled sufficiently by using a cooling coiled pipe before the injected liquid enters a kettle body, so as to ensure that the hydrates in a multi-phase flowing process are stable. According to the device, the permeability of the gas and the liquid of different geological structures above or below an ice point, and the deposit sediment systems under different hydrate saturation degrees can be measured by experiments, so as to provide theoretical foundations for actually exploiting natural gas hydrates.

Description

technical field [0001] The invention relates to a device for measuring the permeability of hydrate-containing porous sediments. Background technique [0002] Natural gas hydrate, also known as combustible ice, is a white crystalline compound formed by natural gas and water under certain conditions (suitable temperature, pressure, gas saturation, water salinity and pH value, etc.), showing a cage structure. The main gas component of natural gas hydrates in nature is methane, so they are often called methane hydrates. As a new type of potential energy, natural gas hydrate has huge reserves. It is considered to be one of the most promising new energy sources that can replace petroleum and other fossil energy sources, and has been widely found in seabed sediments and terrestrial permafrost regions. [0003] The commercial value of natural gas hydrate exploitation is affected by many geological conditions, among which formation permeability is one of the key factors affecting th...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 李小森李波李刚
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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