Rock analysis gas high-vacuum degassing and gas-collecting device

Abstract

The invention relates to a rock analysis gas high-vacuum degassing and gas-collecting device. The device comprises a degassing device and a gas collecting device. The degassing device comprises a stainless steel tank body and a gas pressure detector. Stainless steel balls are disposed in the stainless steel tank body. A stainless steel sealed cap is disposed on the upper portion of the stainless steel tank body. An analysis gas collecting port, a vacuum pump connecting port and the gas pressure detector are respectively disposed on the stainless steel sealed cap. The gas collecting device comprises a glass tank body, a push rod and a needle tube, wherein a sealed piston is arranged on the end portion of the push rod. The push rod is disposed at one end of the glass tank body and the needle tube is disposed at the other end of the glass tank body. The sealed piston is disposed in the glass tank body. The rock analysis gas high-vacuum degassing and gas-collecting device is wide in application range, large in the amount of obtained analysis gas, short in vacuum broken time and low in temperature, and effectively improves the precision and reliability of component data of the analysis gas and isotope composition data.

Description

technical field [0001] The invention relates to an analytic gas degassing and gas-gathering device in the field of oil and gas geochemistry, in particular to a high-vacuum degassing and gas-gathering device for rock analytic gas. Background technique [0002] Atoms or ions on the surface of rock pores have residual valence fields, which have the ability to adsorb gas or liquid. During the process of diffusion and migration, natural gas is continuously adsorbed to form rock-adsorbed gas, which is transformed from the rock-adsorbed state by various physical methods It is converted into a free state and collected, which is called analytical gas in the field of oil and gas geochemistry. Analytical gas research is very important for the identification of natural gas origin, gas source correlation, migration and accumulation, evaluation of source rocks and reservoirs, and unconventional natural gas research fields such as coalbed methane, shale gas, and tight sandstone gas. theor...

AI Technical Summary

Problems solved by technology

These two types of devices all have the following disadvantages: (1) The volume of the degassing device is limited, and the sample volume is limited to less than 50 grams, resulting in a small amount of degassing gas that can be obtained; (2) Due to the existence of the water medium, both types of devices are low Vacuum, high background, high leak rate system, the concentration of hydrocarbons in the obtained analytic gas is low, and the composition and isotopic composition of the analytic gas cannot be tested and analyzed by conventional means

Generally, it is necessary to enrich the analytic gas to test its composition, which increases the difficulty and cost of the test

In particular, it is difficult to test the isotope composition of the desorbed gas based on the existing devices; (3) the gas-gathering devices use water as the airtight medium, and the water in the gas-gathering device will affect the desorbed gas due to the small amount of rock desorbed gas available. The composition and isotopic composition of the rock have affected the research and application of rock analysis gas in the field of natural gas geochemistry; Thermal decomposition produces a certain amount of pyrolysis gas, which affects the composition and isotope composition of the analytic gas, covering the original appearance of the rock analytic gas; (5) Existing devices cannot accurately measure and calculate the amount of desorbed analytic gas

[0004] The above shortcomings directly affect the accuracy and reliability of the analytical gas composition and isotopic composition data

In addition, there are very few reports on degassing and gathering devices for degassing degassing in foreign countries, and there is no way to learn from them, which seriously restricts the application and research of degassing gas in the field of natural gas geochemistry.

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