Natural gas hydrate mining device with reservoir multi-position pressure compensation function

Abstract

The invention belongs to the technical field of natural gas hydrate simulation, and relates to a natural gas hydrate mining device with a reservoir multi-position pressure compensation function. The device mainly comprises a hydrate generation device, a hydrate decomposing device, a gas supply device, a water supply device, an air water compensating device, a temperature control system, a data acquiring system and a computer. An inner sleeve is arranged in a reaction kettle forming the hydrate generation device; internal space of the reaction sleeve is divided into a sample cavity and a confining pressure cavity, which are connected through multiple layers of fluid feeding pipes provided with valves and one-way valves; the one-way valves can guarantee fluids in the confining pressure cavity to flow into the sample cavity in one direction; and through opening and closing of valves arranged in different positions, the flowing quantity of surrounding fluids in the different positions to adecomposing area can be controlled. The device can simulate the pressure compensation of the surrounding fluids to the hydrate decomposing area in multiple positions during mining of hydrates under air-enriched and water-enriched environments, and provides a new thought to a natural gas hydrate simulation technology.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate exploitation simulation, and in particular relates to a natural gas hydrate exploitation device with multi-level pressure compensation function of reservoirs. Background technique [0002] Natural gas hydrate is a high-efficiency new energy source with high energy density, clean and pollution-free, and abundant reserves. It widely exists in permafrost regions and marine sediments. Natural gas hydrate production involves complex mechanisms such as seepage phase transitions. In order to achieve commercial production of natural gas hydrates, researchers have conducted a large number of laboratory simulation studies. However, most researchers use single-layer reactors that only contain hydrate reservoirs. In order to simulate the mechanical effect of the surrounding fluid on the hydrate reservoir, a small number of researchers set up an additional confining pressure chamber that can only t...

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Problems solved by technology

At present, no gas-water compensation device has been reported for the production of hydrate reservoirs in both gas-rich and water-rich environments

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