Method and device for measuring the resistivity of gas hydrate and hydrate-containing sediment in situ
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A technology of hydrate deposits and gas hydrates, applied in the direction of material resistance, etc., can solve problems such as high logging costs, and achieve the effect of compact structure
Inactive Publication Date: 2010-06-02
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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However, due to the high logging costs and the complex conditions of seabed hydrate storage, it is impossible to conduct field resistivity measurements at the occurrence of sediments that may contain hydrates every time
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Embodiment 1
[0031] The method for measuring the resistivity of gas hydrate and hydrate-containing deposits in situ comprises the following steps:
[0032] (1) Formation of hydrates or hydrate deposits:
[0033] i) The reaction gas enters the hydrate reactor from the gas supply system;
[0034] ii) Under the reaction pressure and reaction temperature provided by the hydraulic transmission system and the temperature control system for the hydrate reactor, the reaction gas reacts with other reactants in the hydrate reactor to form hydrate;
[0035] (2) Determination of electrical resistivity properties:
[0036] i) The measurement, control and acquisition system connected to the hydrate reactor processes the measurement data of temperature, pressure, displacement, and resistance collected from the hydrate reactor, and measures the temperature, pressure, displacement, and resistance in the hydrate reactor through the Huygens bridge. The resistance R of the hydrate or hydrate-containing depo...
Embodiment 2
[0051] Using quartz sand, methane, and water to synthesize gas hydrate in porous media, this example is to simulate the measurement of the conductivity of the actually collected sediment samples containing gas hydrate:
[0052] Firstly, the quartz sand with a certain specification is screened, cleaned, put into the hydrate reactor 17, and at the same time, experimental water is added from the water inlet 8 to make the sand particles reach a certain saturation, and the reactor is oscillated to make the sand particles evenly distributed; Turn on the vacuum pump 1, vacuumize to remove the gas in the reactor, and then pass in the required methane gas to make the pressure reach the reaction pressure required for hydrate formation. After a period of time, the methane gas is fully dissolved in water to reach an equilibrium state , close the cylinder shut-off valve 10. Then adjust the constant temperature test chamber 3 to reduce the temperature in the reactor to the required reaction...
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Abstract
The invention discloses a method and a device for measuring the resistivity of gas hydrates and hydrate-containing sediments in situ. The device comprises a hydrate reaction kettle, a temperature control system, an air supplying system, a water supplying system, a measurement and control collection system and a displacement sensor, wherein the temperature control system is arranged on the periphery of the hydrate reaction kettle and provides constant temperature for the hydrate reaction kettle; the air supplying system and the water supplying system are respectively connected with the hydrate reaction kettle; the measurement and control collection system is used for measuring the respectively physical property of the hydrates or the hydrate-containing sediments, one end of the measurement and control collection system is connected between the hydrate reaction kettle and the air supplying system, and the other end of the measurement and control collection system is connected with the hydrate reaction kettle; the output of the hydrate reaction kettle is connected with a hydraulic transmission system used for providing gas reaction pressure; the displacement sensor is arranged on the hydrate reaction kettle, and a measuring bar of the displacement sensor is inserted into the hydrate reaction kettle; and the top and the bottom inside the hydrate reaction kettle are respectively provided with a first copper electrode and a second copper electrode which are connected with the measurement and control collection system. The invention adopts integral optimized design and has compact structure.
Description
technical field [0001] The invention relates to a method and a device for measuring the resistivity of gas hydrate and hydrate-containing deposits. Background technique [0002] Gas hydrate is an ice-like crystalline compound formed by some gases and water under certain low temperature and high pressure conditions. When the content of methane in the gas exceeds 99%, it is called natural gas hydrate, commonly known as combustible ice. Gas hydrates are widely distributed in the seabed and plateau permafrost. 1m 3 When natural gas hydrate decomposes, it can release 164m 3 of methane gas. In the 21st century when oil and other conventional energy sources are increasingly tense, the exploration and development of natural gas hydrates with huge reserves is of great energy strategic significance. A large number of gas hydrates are widely distributed in seafloor sediments and permafrost in solid form. Due to the complex occurrence environment of seabed gas hydrates, the estimat...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 梁德青陈玉凤李栋梁
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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