Pipe-in-pipe underground fluid stratified sampling device

Abstract

The invention provides a pipe-in-pipe underground fluid stratified sampling device. The pipe-in-pipe underground fluid stratified sampling device at least comprises a pressure source, a well head fixing frame, a pipe-in-pipe underground sample introducing mechanism, a packing mechanism and a ground sampling mechanism, wherein the well head fixing frame is used for fixing the device. The pressure source provides sampling power. The pipe-in-pipe underground sample introducing mechanism is a pipe-in-pipe system and performs pipeline arrangement for underground fluid sampling. The ground sampling mechanism transmits power of a power source to the pipe-in-pipe underground sample introducing mechanism and pumps underground fluid to the ground, and then the underground fluid is collected and sampled. The gas push type sampling principle is still adopted for the device, a U-shaped pipe system is upgraded into a pipe-in-pipe system, the number of stratified sampling layers is doubled, bearing force is doubled, sampling depth is extended from a -30 m level to a -200 m level, the structure of the device is greatly simplified, stability and operability are greatly improved, and therefore the competitive advantage of the device in the field of underground fluid sampling devices is further enhanced.

Description

technical field [0001] The invention relates to the technical field of underground fluid sampling, in particular to a pipe-in-pipe underground fluid layered sampling device, which is suitable for layered high-precision sampling of underground fluid. Background technique [0002] Subsurface fluid is an important factor related to the evolution of the earth and the survival of surface organisms. Subsurface fluid sampling can continuously provide a large amount of physical, chemical and microbial information about the formation through isotope tracking, formation residual gas analysis, chemical composition testing, microbial community characteristics and other analysis methods, which is of great guiding significance for engineering development and environmental safety assessment One of the means of monitoring. [0003] To analyze subsurface fluids, a subsurface fluid sample must first be obtained. According to the classification of working principles, various subsurface fluid...

AI Technical Summary

Problems solved by technology

However, there are still the following points worthy of improvement: 1) The application depth is limited, generally no more than -30m underground, which is mainly limited by the pressure resistance of plastic materials and quick connectors; 2) The number of layers of layered sampling is limited by simple isolation Generally, 2-3 layers are realized. If more layers are required to be sampled at the same time, the cross-sectional area of ​​the sampling system and the matching drilling diameter need to be increased; 3) There are many pipelines in the sampling system (such as application The downhole sampling device in a certain project contains 8 pipelines), which brings substantial difficulties to the isolation system and the sealing between formation layers, and increases the difficulty of control and the failure rate of the system

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