Natural gas hydrate density measuring device

Abstract

The invention discloses a natural gas hydrate density measuring device, which comprises a hydrate reaction kettle system, a constant pressure system, a gas source system and a low-temperature constant-temperature bath, wherein the hydrate reaction kettle system is used for synthesizing the natural gas hydrate and measuring the volume of a sample; the constant-pressure system is communicated with a hydrate reaction kettle through a first pressure resistant pipeline, and is used for regulating the gas pressure in the hydrate reaction kettle; the gas source system is connected with a first pressure resistant pipeline arranged between the hydrate reaction kettle system and the constant-pressure system through a second pressure resistant pipeline, and is used for performing vacuum pumping or providing reaction gas for the hydrate reaction kettle system and the constant-pressure system; the low-temperature constant-temperature bath comprises a low-temperature constant-temperature system; a positioning support frame is arranged in the low-temperature constant-temperature system, and the low-temperature constant-temperature system is provided with a sealed space. The hydrate reaction kettle and the constant-pressure system are fixedly arranged on the positioning support frame, and are integrally positioned in the low-temperature constant-temperature bath. The device provided by the invention belongs to a solid density measuring device for high-pressure and low-temperature in-situ measurement of solid of gas-liquid reaction products of natural gas hydrate and the like; the adjustable pressure and temperature in the high-pressure and low-temperature state can be realized; the density features of solid substances under different confining pressure conditions can also be tested.

Description

technical field [0001] The invention relates to a natural gas hydrate density measuring device, in particular to a solid density measuring device for in-situ measuring gas-liquid reaction products such as natural gas hydrate as solid under high pressure and low temperature. Background technique [0002] Natural gas hydrate is an ice-like solid formed by gas (or volatile liquid) and water under certain temperature and pressure conditions, commonly known as combustible ice, widely distributed in the tundra 200-2100 meters below the surface and between the seabed at the continental margin In the sediment of 0-1100 meters below. The natural gas hydrate reserves in the world are very huge, and the natural gas resources in hydrates are estimated to be 2×10 16 m 3 , equivalent to 2×10 5 100 million tons of oil equivalent, which is twice the total carbon content of conventional fuels in the world. Gas hydrate density is one of the most commonly used parameters in hydrate researc...

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Problems solved by technology

However, the density obtained from well logging data is mostly the density of hydrate-containing sediments. For the density of pure hydrate, the literature values ​​are generally lacking.

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