Experimental device and method for accurately calculating hydrate content change in small volume sediments

A hydrate, small-volume technology, used in analytical materials, instruments, etc., can solve the problems of difficult to control hydrate saturation, large measurement errors, and insignificant increase in gas pressure.

Pending Publication Date: 2018-02-27
QINGDAO INST OF MARINE GEOLOGY
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Problems solved by technology

[0004] At present, the volume of samples used in computed tomography experiments used to observe the pore-scale behavior of sediments is usually several cubic centimeters, resulting in insignificant gas pressure reduction caused by gas hydrate synthesis and gas pressure increase caused by gas hydrate decomposition. The

Method used

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  • Experimental device and method for accurately calculating hydrate content change in small volume sediments
  • Experimental device and method for accurately calculating hydrate content change in small volume sediments

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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a small-volume reactor with an effective volume of no more than 10ml is used as an example. It is an experimental device for accurately measuring the change of hydrate content in small-volume sediments. It consists of a small-volume reactor, a standard gas chamber, and a resolution of no more than 1kPa. It consists of a differential pressure sensor and a temperature control module. The small-volume reactor is connected to the standard gas chamber, and a stop valve is arranged between the two; the two ends of the differential pressure sensor are connected to the small-volume reactor and the standard gas chamber to measure the gas pressure difference between the two; the small-volume reaction The kettle, the standard gas chamber and the differential pressure sensor are all placed in the temperature control module to control the temperature of the three to be the same and constant.

Embodiment 2

[0036] Based on the above experimental setup, the figure 2 As shown, an experimental method for accurately measuring and calculating the change of hydrate content in small-volume sediments provided by the present invention specifically includes the following steps:

[0037] (1) Open the temperature control module to keep the temperature of the small volume reactor and the standard gas chamber the same and constant;

[0038] (2) Open the stop valve to connect the small volume reactor and the standard gas chamber to balance the gas pressure of the two;

[0039] (3) Close the shut-off valve to isolate the small-volume reactor from the standard gas chamber. The pressure of the small-volume reactor will decrease due to hydrate synthesis and increase due to hydrate decomposition, while the standard gas chamber pressure will not change;

[0040] (4) A differential pressure sensor is used to measure the pressure difference between the small-volume reactor and the standard gas chambe...

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Abstract

The invention discloses an experimental device and method for accurately measuring and calculating the change of hydrate content in small-volume sediments. The small-volume reactor is connected with a standard gas chamber, and a stop valve is arranged between the two; The reaction kettle is connected to the standard gas chamber, and the gas pressure difference between the small-volume reaction kettle and the standard gas chamber is measured by a differential pressure sensor; the small-volume reaction kettle, the standard gas chamber and the differential pressure sensor are all placed in the temperature control module. The temperature control module controls the temperature of the three to be the same and constant. Differential pressure sensors are used to measure gas pressure changes, which are easier to measure small changes in gas pressure caused by hydrate synthesis or decomposition in small-volume sediments. It is easy to obtain high-resolution experimental data of hydrate molar content during synthesis and decomposition. The temperature control module effectively avoids the influence of temperature changes on gas pressure, thereby ensuring the accuracy of hydrate content change measurement.

Description

technical field [0001] The invention belongs to the technical field of basic physical property testing of unconventional oil and gas reservoir engineering and geotechnical engineering, and specifically relates to an experimental device and method for accurately measuring and calculating the change of hydrate content in small-volume sediments. Background technique [0002] Natural gas hydrate is a cage-type crystalline compound formed by natural gas and water under specific temperature and pressure conditions. It is widely distributed in deep-water formations such as oceans and lakes and permafrost formations such as polar plateaus. The reserves are very huge and are considered to be 21 As one of the most important potential energy sources in the century, it has been highly valued by governments and research institutions at home and abroad. [0003] The depressurization method is the preferred method for trial production of natural gas hydrates. However, due to the poor perme...

Claims

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Application Information

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IPC IPC(8): G01N7/00
CPCG01N7/00
Inventor 刘乐乐
Owner QINGDAO INST OF MARINE GEOLOGY
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