An experimental device for visualizing the mechanical properties of hydrate wall adhesion and its working method

Abstract

The invention relates to a visual experiment device of wall adhesion mechanical properties of hydrate and a working method of the visual experiment device. The visual experiment device comprises a circulating refrigeration system, a testing unit system, a microcosmic operation system and a microscopic observation system, wherein the testing unit system comprises a normal-pressure visual reaction device, a normal-pressure reaction groove, a liquid inlet, a liquid outlet and a testing unit element; the normal-pressure reaction groove is arranged on one side wall of the visual reaction device; the liquid inlet and the liquid outlet are formed in the side wall in a communicating manner; a visual window is further arranged on the side wall; the testing unit element is arranged in the normal-pressure reaction groove; the testing unit element comprises a solid metal block and transparent quartz frames; a plurality of transparent quartz frames are arranged on the solid metal block. By adopting the visual experiment device provided by the invention, generation, growth and deposition conditions of cyclopentane hydrate on a wall can be researched and monitored relatively well, and condition limitation that the hydrate only can be generated under a high-pressure environment is eliminated, so that an adhesion force of the cyclopentane hydrate generated on the wall is more accurately and directly measured.

Description

technical field [0001] The invention relates to an experimental device for visualizing the mechanical characteristics of hydrate wall adhesion and a working method thereof, which belong to the technical field of oil and gas exploitation, in particular to the field of deep sea oil and gas exploitation, and are especially suitable for experimental research on the adhesion mechanics of hydrate walls in oil and gas pipelines. Background technique [0002] Hydrate is a cage structure formed by the structure of water molecules connected by hydrogen bonds, and gas molecules are surrounded in the crystal lattice under the action of van der Waals force. The structural cavities made up of water molecules are filled by small molecules that act to stabilize the crystal lattice. Small molecules include hydrocarbons with small relative molecular masses, such as methane, ethane, propane, as well as hydrogen and carbon dioxide. During the development of deep-water gas fields, most of the g...

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Problems solved by technology

[0006] However, the above equipment is carried out under low temperature and high pressure conditions, the operation has certain risks, and the degree of visualization is low, so it is impossible to observe the formation of hydrate in real time and directly measure the adhesion force and other data

[0007] Hydrate pipe wall deposition is a key factor leading to pipe blockage and valve failure, and hydrate growth on pipe wall is one of the basic modes of hydrate pipe wall deposition. However, the current research on this mode is only in the macroscopic qualitative recognition. At the stage of knowledge, related experimental tests and theoretical research are still in the initial stage of exploration.

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