System and method for visually evaluating production and blockage law of hydrate in screen

A hydrate formation and evaluation system technology, applied in the direction of testing moving fluid/granular solids, etc., can solve problems such as unsatisfactory risk assessment, and achieve the effect of protecting the seal and avoiding direct impact

Active Publication Date: 2018-06-29
QINGDAO INST OF MARINE GEOLOGY +1
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the fact that the current conventional evaluation method for the impact of sand control media on production capacity cannot meet the needs of risk assessment for natural gas hydrate production wells, the present invention provides a visual method for real-time observation of hydrates on both sides of the sand control screen mesh. The experimental device and method of secondary generation, enrichment and plugging law, so as to calculate and control the additional skin coefficient of bottom hole screen sand control under different well structure conditions of natural gas hydrate production wells (vertical wells, horizontal wells or multi-branched holes) Provide basic data for the formulation of precise pressure reduction and temperature control schemes, and provide strong support for the sand production management system of natural gas hydrate production wells

Method used

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  • System and method for visually evaluating production and blockage law of hydrate in screen
  • System and method for visually evaluating production and blockage law of hydrate in screen
  • System and method for visually evaluating production and blockage law of hydrate in screen

Examples

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Embodiment 1

[0036] Embodiment 1. This embodiment proposes a visual evaluation system for the rule of hydrate formation and clogging in the screen. Refer to figure 1 , including a reactor 1, a vacuum pump 3, a gas-liquid mixing coil 5, a methane cylinder 6, a water supply pump 8, a circulation pump 9, a water bath refrigeration cabinet 7, a high-speed camera 10 and a data acquisition module 11.

[0037] refer to figure 2 and image 3 , The reactor includes: sapphire kettle body 13, reactor inlet end cover 12, connecting clamp 14, reactor outlet end cover 15, rotating bracket 18, horn inlet 19, screen assembly, sealing rubber ring 21, screen mesh Sheet support and the high-pressure metal pipe 16 and high-pressure hose 17 that are connected with it. The sapphire kettle body 13, the inlet end cover 12 and the outlet end cover 15 of the reaction kettle are double-sealed by the end sealing rubber ring and the side wall sealing rubber ring, and the reaction kettle inlet end cover 12 and the o...

Embodiment 2

[0044] Example 2, this example proposes a visual evaluation method for the blockage rule of hydrate formation in the screen, refer to Figure 8 , including the following steps:

[0045] (1) Determine the simulated well type and install the experimental process: According to the actual simulated well type, determine the inclination angle of the reactor required for the hydrate blockage simulation evaluation experiment in the screen, adjust and fix the reactor. Connect the reaction kettle, vacuum pump, gas-liquid mixing coil, methane gas cylinder, water supply pump, circulation pump, water bath refrigeration cabinet and data acquisition module in sequence;

[0046] (2) Vacuuming: Connect the loop process, open the valves between the gas-liquid mixed delivery coil and the reactor, between the circulation pump and the reactor, and between the circulation pump and the gas-liquid mixed delivery coil, and turn on the vacuum pump. Vacuum the entire system;

[0047] (3) Pressurizatio...

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Abstract

The invention provides a system for visually evaluating a production and blockage law of hydrate in a screen and a testing method thereof. An experimental system for testing a secondary production, enrichment and blockage law of the hydrate in a screen mesh comprises a reaction kettle, a gas-liquid mixed conveying coil, a high-speed camera, a data acquisition and processing module and the like. The testing method is based on the system, and through adjustment of a cooling mode and control of a temperature and pressure condition and a gas-liquid ratio condition, a three-dimensional chart of thesecondary production and blockage of the hydrate in the screen mesh is simulated; the system can provide basic data for calculation of a well-bottom screen sand control additional skin factor and formulation of a precise pressure-reducing and temperature-controlling scheme under different well body structure conditions (a vertical well, a horizontal well or a multi-branch hole) of a natural gas hydrate production well, and provides a strong support for a sand production management system of the natural gas hydrate production well.

Description

technical field [0001] The invention belongs to the field of natural gas hydrate exploitation, and relates to the technical direction of evaluating the production capacity decline degree of hydrate wells caused by the clogging of mechanical screen pipes at the bottom of wells during the exploitation of marine hydrates, and specifically relates to a secondary hydrate production method in screen mesh sheets under actual mining conditions. An evaluation system and method for generating blocking laws. Background technique [0002] There are a large number of natural gas hydrate resources in the surrounding sea areas of my country, and the successful exploitation of natural gas hydrate resources will help improve my country's energy structure. In 2017, my country carried out the first 60-day test production of natural gas hydrate in the muddy silt reservoir in the Shenhu area of ​​the South China Sea, and obtained a cumulative gas production of 309,000 cubic meters, and obtained ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/85
CPCG01N21/85
Inventor 李彦龙吴能友刘昌岭李承峰刘浩伽陈强刘乐乐
Owner QINGDAO INST OF MARINE GEOLOGY
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