Simulation method and experimental device for carbon dioxide replacement exploitation of gas hydrate

Abstract

The invention discloses an experimental device and a method for carbon dioxide replacement exploitation of gas hydrate. The experimental device comprises a one-dimensional model, a gas supply unit, a working solution supply unit, an axial compression control unit, a back pressure control unit and an environment control unit. Each unit is respectively provided with a sensor connected to a data processing unit. The one-dimensional model is arranged in the environment control unit. The inside of the one-dimensional model is a sealed simulation cavity. The upper part of the one-dimensional model is provided with a gas and solution inlet, a gas and solution outlet and an axial compression solution inlet. A gas output pipeline of the gas supply unit is communicated with the gas and solution inlet after being connected with a working solution output pipeline of the working solution supply unit. A back pressure acquisition pipeline is communicated with the gas and solution outlet. The axial compression control unit is connected with the axial compression solution inlet. The one-dimensional model is also provided with a vacuum-pumping interface. The invention can really simulate the external environment to carry out simulation exploitation of carbon dioxide replacement of the gas hydrate, and can provide guidance for the carbon dioxide replacement exploitation of the gas hydrate.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to a simulation method and an experimental device for carbon dioxide displacement exploitation of natural gas hydrate. Background technique [0002] Natural gas hydrate refers to a cage-like crystal substance formed by natural gas and water at a certain temperature and pressure. It can burn when exposed to fire, commonly known as "combustible ice". Early research on natural gas hydrate was mainly to solve oil and gas production. The blockage of pipelines and equipment during transportation and transportation is mainly to inhibit the formation of hydrates. With the continuous deepening of people's research on hydrates, the characteristics of hydrates and their impact on the environment have become more and more known to humans, and more importantly, their value as an effective alternative energy has also become increasingly prominent. [0003] Gas hydrates c...

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Problems solved by technology

[0004]Because of the different geological conditions and the composition of natural gas hydrates in various places, the formation mechanism is different, so the research is carried out through simulation experiments, and the appropriate displacement pressure is selected to determine the most suitable However, the existing experimental equipment is relatively simple, and it is difficult to meet the current research needs of gas hydrate replacement by carbon dioxide replacement. At the same time, there are still relatively few professional simulation laboratories that fully serve the method of carbon dioxide replacement production of natural gas hydrate.

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