Free hydrocarbon and soil sample collecting device and collecting method

Abstract

The invention provides a free hydrocarbon and soil sample collecting device and a collecting method. The free hydrocarbon and soil sample collecting device comprises a hollow drill pipe and a helix slice; the pipe body outer wall of the hollow drill pipe is wound with the helix slice in a helical manner, and the helix slice is extended to the bottom of the hollow drill pipe; the bottom of the hollow drill pipe is connected with a double-wing drill; the upper part and the lower part of the pipe body outer wall of the hollow drill pipe are provided with an air extraction opening and an air inlet port; a capillary is arranged in a hollow cavity of the hollow drill pipe; and the air extraction opening and the air inlet port are communicated via the capillary. According to the free hydrocarbon and soil sample collecting device, a power head is used for driving a whole helix drill pipe to drill; drilling power is large, speed is high, and free hydrocarbon gas of soil 3 meters deep or deeper under the ground can be obtained; the double-wing drill and the helix slice are combined, soil samples of a same depth can be obtained in drilling processes, metal capillary state is more stable, and it is beneficial for obtaining of high-quality free hydrocarbon gas samples.

Description

technical field [0001] The invention relates to a collection device and method for free hydrocarbons and soil samples, belonging to the technical field of oil and gas geochemical exploration. Background technique [0002] Geochemical exploration is an important method in the exploration of oil and gas resources. The collection of free hydrocarbons in soil is an important part of geochemical exploration, and the analysis of free hydrocarbons is an important indicator that can reflect oil and gas anomalies. Above the oil and gas reservoirs, due to the micro-seepage of hydrocarbon gas, through surface sampling and on-site chemical analysis of free hydrocarbon indicators, oil and gas anomalies can be quickly discovered. At the same time, collecting soil samples and analyzing them can be used as auxiliary indicators. [0003] At present, the commonly used collection devices for free hydrocarbon gas samples are as follows: [0004] The first is to use a steel brazing device. Aft...

AI Technical Summary

Problems solved by technology

Due to the lack of power of this collection device or the poor sealing of steel brazing and air extraction, the air on the surface easily enters the air extraction device, thereby causing interference to the free air collected on the surface; in addition, due to the shallow sampling depth, it is easy to collect samples. Interferenced by surface pollution, so that when analyzing free hydrocarbon samples, wrong information is often obtained, which affects the detection effect of oil and gas geochemical exploration

[0005] The second is the manpower-operated conical drill helical drilling tool, which has the advantages of simple design, easy to carry, and the depth of collection is about 3 meters. soil sample

Its advantage is that it has large power, can quickly collect samples at a depth of 3 meters, the sample is less polluted by the surface, and the auger has good sealing performance, which can better collect free hydrocarbons in the soil. The disadvantage is that the tapered drill bit used The bottom is squeezed to both sides, and the soil cannot be returned in time, and soil samples at the same depth cannot be obtained; the plastic capillary has certain pollution to the free hydrocarbons of organic components when the drilling tool heats up; When the air is too high, the capillary is easily frozen by water droplets and blocked

[0007] In addition, in the prior art, the formations where free hydrocarbon gas and soil samples are collected using existing tools are relatively shallow, and the shallow formations are easily polluted, and the data obtained in this case will have a negative impact on the oil and gas index data

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