Mechanical property measuring device for natural gas hydrates

Abstract

The invention discloses a mechanical property measuring device for natural gas hydrates. The device comprises a data collecting system, a vacuum pumping system, a natural gas pressurization air inlet system and a hydrate reaction still, wherein the hydrate reaction still comprises a reaction still base, an end cover, a force applying rod, a reaction still casing and a reaction bracket, the reaction still casing and the reaction still base are connected through a bolt and are sealed through a sealing ring, the end cover is connected with the reaction still base through a spiral stainless steel pipeline, the force applying rod penetrates in from the top part of the reaction still casing and is sealed through a sealing ring, one end of the force applying rod is propped against the end cover, the other end of the force applying rod is propped against the reaction bracket, a first inlet / outlet and a second inlet / outlet are formed in the end cover, a third inlet / outlet and a fourth inlet / outlet which penetrate through the center of a boss of the reaction still base are formed in the reaction still base, and the four inlets / outlets are connected with the vacuum pumping system and the natural gas pressurization air inlet system. The measuring device can be used for measuring the mechanical property of solids in situ under the conditions of high pressure and low temperature, the usage range of the existing device is expanded, and the measurement accuracy is improved.

Description

technical field [0001] The invention relates to a test device for the mechanical properties of natural gas hydrate, in particular to a device for measuring the mechanical properties of solids in situ under high pressure and low temperature. Background technique [0002] 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 sediments below the surface of the tundra and under the seabed at the continental margin middle. Natural gas hydrate has huge natural gas storage capacity. The ideal structure type I methane hydrate contains 164 times the methane gas in the standard state, and the type II structure gas hydrate contains 184 times the natural gas in the standard state. 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 t...

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Problems solved by technology

The harmfulness of gas hydrate is also manifested in that its decomposition will lead to uneven bearing capacity of the formation. This uneven bearing capacity will threaten the safety of offshore engineering, such as causing uneven settlement of the pile legs of the drilling platform, causing the platform to tilt or even overturned etc.

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