Supercritical carbon dioxide high-temperature and high-pressure PVT testing and methane displacement integrated experimental device and method

A carbon dioxide, high temperature and high pressure technology, applied in measuring devices, uses the flow characteristics of fluids to determine specific gravity, specific gravity measurement and other directions, which can solve the problems of cumbersome operation, difficult heating, waste of resources, etc.

Pending Publication Date: 2019-01-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, general PVT cylinders are inconvenient to observe the phase state of substances, lack of camera equipment, cannot accurately record the phase state characteristics of supercritical carbon dioxide, use water bath heating, and it is difficult to heat to above 100 °C, etc.
The supercritical carbon dioxide vis

Method used

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  • Supercritical carbon dioxide high-temperature and high-pressure PVT testing and methane displacement integrated experimental device and method
  • Supercritical carbon dioxide high-temperature and high-pressure PVT testing and methane displacement integrated experimental device and method
  • Supercritical carbon dioxide high-temperature and high-pressure PVT testing and methane displacement integrated experimental device and method

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Experimental program
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Effect test

Embodiment 1

[0063] Such as figure 1 , figure 2As shown, an experimental device for the integration of supercritical carbon dioxide high temperature and high pressure PVT testing and methane displacement, including a liquid carbon dioxide storage tank 1, a positive displacement pump 8, a core holder 25, a first constant temperature oil bath system 23, a second constant temperature Oil bath system 24, ring pressure generating device 20, differential pressure sensor 13 and computer control system 27, computer control system 27 is prior art, rock core holder 25 is provided with upper inlet and outlet, also includes liquid methane storage tank 2, PVT cylinder 9, sodium hydroxide absorption tank 21 and gas storage tank 22. The PVT cylinder adopts the BDR mercury-free PVT cylinder in the prior art. There are inlets and outlets on the PVT cylinder 9, and an inlet is provided on the sodium hydroxide absorption storage tank 21. and the outlet, the outlet of the liquid carbon dioxide storage tank ...

Embodiment 2

[0066] A kind of supercritical carbon dioxide high temperature and high pressure PVT test experimental method, utilizes above-mentioned experimental device, comprises the following steps:

[0067] By observing the optical effect of supercritical carbon dioxide in the PVT cylinder, its phase characteristics at different pressures and temperatures are obtained, and the density and viscosity of supercritical carbon dioxide are calculated; by measuring the pressure drop generated by supercritical carbon dioxide flowing through the core, it is calculated at Viscosity in Porous Media

[0068] (A), adjust the first needle valve 3a, the second needle valve 3b to be in the closed state, the third needle valve 3c, the fourth needle valve 3d, and the fifth needle valve 3e to be in the open state, and the displacement pump 8 to be in the inactive state. The time-volume pump 8 is in communication with the test pipeline, and the vacuum pump 16 is used to get rid of the gas in the test pipel...

Embodiment 3

[0101] An experimental method for supercritical carbon dioxide to displace methane, utilizing the above-mentioned experimental device, comprising the following steps:

[0102] Measure the flow volume of supercritical carbon dioxide flowing through the core, and calculate its gas removal efficiency in porous media

[0103] (a), adjust the first needle valve 3a, the second needle valve 3b to be in the closed state, the third needle valve 3c, the fourth needle valve 3d, and the fifth needle valve 3e to be in the open state, and the displacement pump 8 to be in the unopened state, use Vacuum pump 16 removes the gas in the pipeline, and replaces the rock core in the rock core holder;

[0104] (b), open the second needle valve 3b, close the first needle valve 3a, the third needle valve 3c, the fourth needle valve 3d, the fifth needle valve 3e, start the displacement pump 8, and make methane flow from the liquid methane storage tank 1 Outflow, adjust booster pump 4, heating system 5...

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Abstract

The invention relates to a supercritical carbon dioxide high-temperature and high-pressure PVT testing and methane displacement integrated experimental device and method. The device comprises a liquidcarbon dioxide storage tank, a liquid methane storage tank, a displacement pump, a core holding unit, a constant-temperature oil bath system, a PVT barrel, a ring pressure generation device, a pressure difference sensor, a flow sensor, a pressure sensor, a temperature sensor, a sodium hydroxide absorption storage tank and a gas storage tank, wherein the liquid carbon dioxide storage tank and theliquid methane storage tank are separately connected to an inlet of the PVT barrel via a first pipeline, a second pipeline and a third pipeline; an outlet of the PVT barrel is connected with an inletof the core holding unit through a fourth pipeline; a manifold tee is separately connected with the outlet of the core holding unit, the inlet of the sodium hydroxide storage tank and the third pipeline through a fifth pipeline, a sixth pipeline and a seventh pipeline; and the outlet of the sodium hydroxide storage tank is connected with the gas storage tank through an eighth pipeline. By the supercritical carbon dioxide high-temperature and high-pressure PVT testing and methane displacement integrated experimental device and method, the changing law of the phase state, viscosity and displacement efficiency of supercritical carbon dioxide at a high temperature and under high pressure along with the temperature and pressure can be researched.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas production enhancement, and specifically relates to an experimental device and method for integrating supercritical carbon dioxide high-temperature and high-pressure PVT testing and methane displacement. Background technique [0002] Under the current situation of energy shortage, the development of new technologies to effectively improve the efficiency of exploration and development of oil and gas resources has become a hot spot of research and development. Supercritical carbon dioxide has both the low viscosity and easy diffusivity of gas, and the high density and good solubility of liquid. Based on the micro-nano porous media of unconventional natural gas reservoirs, supercritical carbon dioxide is a new and efficient method for natural gas extraction. , the use of supercritical carbon dioxide to enhance natural gas recovery is conducive to relieving the pressure on natural g...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N11/08G01N9/32G01N9/26G01N25/02
CPCG01N9/266G01N9/32G01N11/08G01N15/0806G01N15/0826G01N25/02
Inventor 邓佳张奇于子涵李鑫鑫曹青袁艺超杜建冲
Owner ZHENGZHOU UNIV
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