Integrated device for in-situ generation and decomposition of hydrate sediments and permeability measurement thereof

Abstract

An integrated device for in-situ generation and decomposition of hydrate sediments and permeability measurement thereof belongs to the field of measuring the basic physical properties of natural gas hydrates. The device mainly comprises a reaction kettle, a cold store, a scavenging leakage detection system, a temperature control system, a gas supply system, a water supply system, a permeability measurement system and a computer data acquisition system. A compression type design is adopted for the reaction kettle so that different stress states can be simulated. The device has the following advantages that: the cold store and a constant temperature bath are capable of realizing quick and accurate control of temperatures; the gas supply system is quick and convenient to increase and preserve pressures; the data acquisition system has the functions of data storage and real-time analysis; the temperatures, pressures, historical sedimentary conditions and stress states of different hydratesediment reservoirs can be simulated; and a hydrate sediment sample can be integrally taken out in a relatively convenient manner, and can be directly put in a low-temperature high-pressure three-axis tester for the mechanical characteristic testing research. Besides, the device plays an important role in guiding the drilling and safe mining of natural gas hydrates.

Description

Technical field [0001] The invention relates to an integrated device for in-situ generation and decomposition of hydrate sediment and its permeability measurement, belonging to the field of natural gas hydrate basic physical property measurement. Background technique [0002] Natural gas hydrate has the characteristics of wide distribution, large resources, shallow burial, high energy density, and cleanliness. It is the largest unknown energy reservoir on the earth that has not been developed. It is considered to be the most ideal new energy source with commercial development prospects in the 21st century. The safe exploitation of natural gas hydrate has received extensive attention from scientists and governments of various countries. It has become a new research hotspot in the oil and gas industry and may have a profound impact on the development of environmental science and energy industry. In May 2007, my country formally collected physical samples of natural gas hydrate in t...

AI Technical Summary

Problems solved by technology

However, the currently used hydrate sediment simulation device cannot compress and consolidate the sediment framework, and cannot truly simulate the historical deposition conditions and stress state of hydrate sediments

And affected by its size and design factors, the generated hydrate sediment sample cannot be taken out as a whole, or part of it can be put into a low-temperature high-pressure triaxial testing machine for mechanical properties, etc., after liquid nitrogen cooling, lathe processing and other processes. further research work

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