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Marine leakage type natural gas hydrate reservoir forming simulation experiment device and method based on geotechnical centrifuge

A technology for simulating experimental devices and geotechnical centrifuges, applied in the fields of earthwork drilling, teaching models, instruments, etc., can solve problems such as poor representation of the accumulation process, achieve fast and efficient simulation, improve research efficiency, and shorten the experimental time.

Active Publication Date: 2020-08-25
QINGDAO INST OF MARINE GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the rapid and efficient simulation of the natural gas hydrate accumulation process under the condition of buoyancy-controlled gas seepage, which is difficult for the existing indoor simulation experiment device and method, resulting in poor representativeness of the simulated marine seepage type natural gas hydrate accumulation process To address these problems, a geotechnical centrifuge-based marine seepage natural gas hydrate accumulation simulation experiment device and method is proposed, which skillfully avoids the limitations of existing gas micro-flux supply technology, and achieves the simulation of marine seepage natural gas hydration in the laboratory. The more representative purpose of the accumulation process

Method used

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  • Marine leakage type natural gas hydrate reservoir forming simulation experiment device and method based on geotechnical centrifuge
  • Marine leakage type natural gas hydrate reservoir forming simulation experiment device and method based on geotechnical centrifuge
  • Marine leakage type natural gas hydrate reservoir forming simulation experiment device and method based on geotechnical centrifuge

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Embodiment 1

[0044] Embodiment 1. A marine seepage type natural gas hydrate accumulation simulation experimental device based on a geotechnical centrifuge, such as figure 1 and figure 2 As shown, it includes a geotechnical centrifuge, a hanging basket assembly and an arm carrying equipment assembly. The hanging basket assembly is hinged to one end of the geotechnical centrifuge arm 29 of the geotechnical centrifuge through the hanging basket connecting shaft 20, and the hanging basket assembly The basket assembly is the simulation site for hydrate accumulation, and the geocentrifuge provides a centrifugal acceleration field of at least several tens of times the acceleration of gravity for hydrate accumulation ( figure 1 The geotechnical centrifuge arm 29, counterweight 30, geotechnical centrifuge base 31 and centrifugal rotating shaft 32 in the dotted line part are composed of mature equipment geotechnical centrifuge core components, and the present invention does not limit this); The ca...

Embodiment 2

[0055] Embodiment 2. Based on the hydrate accumulation simulation experimental device disclosed in Embodiment 1, this embodiment discloses a marine seepage natural gas hydrate accumulation simulation experimental method based on a geotechnical centrifuge, specifically:

[0056] Step 1. Preparation before experiment:

[0057]Place the square sample cylinder 3 in the cylinder 11 of the high-pressure chamber, cover the fixed frame 6 and tighten the four bolts 7 to fix it; fill the soil sample 1 in layers and compact it to a height of 300mm, and control the porosity of the soil sample at 38 % to 40%, and inject water from the bottom of the soil sample 1 to saturate it; install the cold light source camera 4 and the temperature probe 5, install the high-pressure chamber upper cover 14 and fix it with a ferrule 15; inject it into the gas supply tank 22 Natural gas to 10MPa. After preparing the high-pressure gas source for the circulating gas supply, remove the gas cylinder and other...

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Abstract

The invention discloses a marine leakage type natural gas hydrate reservoir forming simulation experiment device and method based on a geotechnical centrifuge. The experiment device comprises a geotechnical centrifuge, a hanging basket assembly and a rotary arm carrying equipment assembly. The hanging basket assembly is hinged to one end of a geotechnical centrifuge rotary arm through a hanging basket connecting shaft and comprises a natural gas hydrate-containing soil body sample, a fixing component of the natural gas hydrate-containing soil body sample, a high-pressure bin, a water bath jacket and the like, and the rotary arm carrying equipment assembly is fixedly arranged on the geotechnical centrifuge rotary arm and used for achieving hydrate reservoir forming temperature control, gassource supply and data acquisition. According to the device and the method, a gravity field is simulated by centrifugal acceleration generated by high-speed rotation of a centrifugal machine in a laboratory to increase buoyancy; and on the premise that the gas flux is not changed, rapid and efficient simulation of the natural gas hydrate reservoir forming process under the buoyancy-controlled gasleakage condition is achieved, the limitation of an existing gas micro-flux supply technology is skillfully avoided, and the leakage type natural gas hydrate reservoir forming process is closer to theactual situation of a natural field.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate accumulation experiment simulation technology, and in particular relates to a marine seepage type natural gas hydrate accumulation simulation experimental device and method based on a geotechnical centrifuge. Background technique [0002] Gas hydrate is a cage-type crystalline solid compound formed by natural gas and water under high pressure and low temperature conditions. It is widely distributed in terrestrial permafrost formations and offshore slope reservoirs in nature. According to different accumulation mechanisms, gas hydrate systems in marine sedimentary environments are divided into two types: diffusion type and seepage type. Compared with diffusion-type gas hydrate, seepage-type gas hydrate has the characteristics of shallow burial and large reserves, and has greater exploitation and utilization value. In recent years, it has attracted more attention from domestic and foreig...

Claims

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Application Information

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IPC IPC(8): G09B25/00E21B49/00
CPCE21B49/00G09B25/00
Inventor 刘乐乐刘昌岭吴能友孟庆国卜庆涛
Owner QINGDAO INST OF MARINE GEOLOGY
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