Minimum gas high precision collection device and its usage method

Abstract

The invention discloses a high-accuracy collector of micro gas and a relative method, belonging to oil gas earth chemical analysis technical field. The device comprises a tube and a needle valve, wherein a gas room of the tube has a gas tube communicated with a cylinder, a below piston of the cylinder is connected with a reciprocal drive device, the cylinder comprises pump liquid while upper part is connected with a separate tube in which a seal steel ball is arranged which top is connected with a gas bottle with a valve, the gas room comprises a vacuum gage, the gas room and the separate tube are arranged with air exhaust tube, the gas tube and the air exhaust tube are arranged with electromagnetic valves. And the method comprises that (1), adding a sample tube, (2), vacuuming and breaking the sample tube, (3), dispersing gas into the cylinder, (4), the piston moves up to press gas into the gas bottle, (5), the piston moves down to disperse gas in the gas room and the cylinder until balance, (6), repeating the steps (4, 5) to transfer gas all into the gas bottle. The invention is used for geological sample analysis in oil gas earth chemical research.

Description

technical field [0001] The invention relates to a test analysis technology, in particular to a high-precision collection device for trace gas in oil and gas geochemical research, and also relates to a method for using the device. Background technique [0002] In oil and gas geochemical research, it is necessary to encapsulate geological samples in gold sample tubes, heat them under a certain temperature and pressure, and then analyze the quantity and composition of natural gas produced by the samples. After the heating experiment, the gas in the gold tube needs to be collected and transferred to the sample bottle for various analysis. At present, the foreign method is to place the gold sample tube in a vacuumed glass tube, turn the needle valve knob to make the needle point on the top of the knob pierce the gold tube, gas and some light hydrocarbons (C 6 -C 12 ) is released, wherein the light hydrocarbons are frozen and precipitated in the cold trap, the gas (C 1 -C 5 , ...

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Problems solved by technology

[0003] The above-mentioned device and process have the following disadvantages: (1) about 15 kilograms of mercury is needed in the device, and once it leaks, it will cause great harm to the human body and the environment

(2) It takes a long time (about 1 hour) to completely transfer the gas from the glass tube to the gas chamber, and the work efficiency is low

(3) The amount of gas is determined according to the visual mercury column height, and there are human errors

(4) The system requires high vacuum, so the equipment is complicated and the maintenance cost is high

(5) The process of cleaning the cold trap and transferring the light hydrocarbons to the sample bottle is cumbersome. If the operation is not done properly, some light hydrocarbons will be lost.

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