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Simulation device for natural gas hydrate growth in ground shut-in period of deep water gas well

A technology for simulating devices and natural gas, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., and can solve problems such as drilling, mining troubles, and affecting testing work

Inactive Publication Date: 2017-06-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual test process, only when the hydrate grows to a certain extent will it affect the test work and bring great troubles to the subsequent drilling and mining work.

Method used

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  • Simulation device for natural gas hydrate growth in ground shut-in period of deep water gas well
  • Simulation device for natural gas hydrate growth in ground shut-in period of deep water gas well
  • Simulation device for natural gas hydrate growth in ground shut-in period of deep water gas well

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Embodiment Construction

[0056] The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0057] figure 2 In order to test the principle diagram of hydrate growth at the surface shut-in stage of deep water gas wells, a "water splashing and freezing" growth characteristic model was established for the growth of hydrate in the test string. In the shut-in phase of deep-water gas well testing, the gas phase in the test string is a continuous phase, with water vapor molecules dissolved in the gas phase, in addition to a small amount of small droplets. After shut-in on the surface, the liquid phase on the inner wall of the test string mainly exists in the form of a liquid film. Because the shut-in fluid does not flow, the liquid film will gradually slide down to the bottom of the well under the action of gravity. The water vapor in the wellbore is in random and free movement. Some of the water vapor molecules migrate to the liquid film on the w...

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Abstract

The invention relates to a simulation device for natural gas hydrate growth in a ground shut-in period of a deep water gas well. The simulation device consists of a reaction pipe column, a constant temperature control system, a natural gas supply system, a natural gas pressurizing system, a liquid supply system, a drainage system, a parameter monitoring and data acquisition system and a computer terminal. By the use of the device, the growing condition of hydrates in the ground shut-in process during deep water gas well testing can be simulated, so that the hydrate growing rules under conditions of different moisture contents, temperatures and pressures can be obtained; therefore, the rules are used for researching the feasibility of a two on and two off production system during the deep water gas well testing, and a reference can be provided for reasonable preparation of a working system.

Description

Technical field [0001] The invention relates to the technical field of exploration and development of deep water gas wells, in particular to a natural gas hydrate growth simulation device during the shut-in phase of the deep water gas well testing process. Background technique [0002] Natural gas hydrate is a clathrate compound formed by natural gas and water at a low temperature and a certain pressure above the freezing point, which looks like ice but has a different crystal structure from ice. Among them, water molecules form a main crystalline network through hydrogen bonds, and the pores in the crystal lattice are filled with light hydrocarbons (methane, ethane, propane, isobutane) or non-light hydrocarbons (nitrogen, carbon dioxide, and hydrogen sulfide) molecules, the so-called Guest molecule. [0003] During the exploration and development of deep water gas wells, the main form of methane CH 4 Methane hydrate of guest molecules. Its formation needs to go through two stage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/22G01D21/02
CPCG01D21/02G01N33/225
Inventor 韩松李相方周云健李轶明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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