Generalized tracing and diluting method for monoporate penetration flow rate measurement

A measuring method and technology of flow velocity, applied in the direction of measuring flow/mass flow, measuring device, fluid velocity measurement, etc., can solve the problems of complicated probe manufacturing, inconvenient use, loss of pressure balance tube, etc.

Inactive Publication Date: 2002-04-17
HOHAI UNIV
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  • Abstract
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Problems solved by technology

Although this tracer method solves the above problems in theory, and corresponding probes have been developed and applied to actual measurement, however, the manufacture of this probe is very complicated, and it is extremely inconvenient to use. Radioactive isotopes are used as tracers. Cannot be promoted on a large scale
The most important point is that in boreholes where filter pipes are installed, this method does not really prevent vertical flow, as vertical flow may flow through the gravel pack between the screen pipes and the borehole, even with the use of pressure equalization pipes , it is also very difficult to completely avoid the interference of vertical flow, especially when the aquifer being measured is an influx aquifer, the pressure equalization tube loses its effect

Method used

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  • Generalized tracing and diluting method for monoporate penetration flow rate measurement
  • Generalized tracing and diluting method for monoporate penetration flow rate measurement
  • Generalized tracing and diluting method for monoporate penetration flow rate measurement

Examples

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Embodiment Construction

[0029] Take the tracer experiment in Shijiao Section of Beijiang Embankment in Guangdong Province as an example.

[0030] First verify the presence of vertical flow in the experimental well. Using the probe and method developed and proposed by W.Drost, the structure and test method of the tracer probe can be found in Figure 8 . (Peak-peak method to measure vertical flow: if there is a vertical flow from bottom to top in the hole after the source is cast, the two detectors on the top will successively receive the gamma rays emitted by the tracer, and the intensity is the same as that of the tracer is proportional to the concentration, the peak concentration of the concentration over time represents the concentration center of the tracer, the distance between the two detectors divided by the time difference between the two peaks can calculate the vertical flow velocity. If the vertical flow is downward movement Similarly, the lower two detectors will detect the vertical flow ...

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Abstract

The present invention is one generalized tracing and diluting method for monoporate penetration flow rate measurement. The method includes: measuring perpendicular flow inside the pore via peak-peak method; injecting tracer agent to the measured section of the pore in spot or sectional feeding mode; data acquisition to record density and variation of tracer agent; and calculating the osmotic flow rate and horizontal flow rate of underground water by applying generalized diluting method. Compared with prior art, the present invention is superior in that by means of the simple method, precise hydrogeological parameters may be obtained without stopping water flow.

Description

1. Technical field [0001] The invention relates to a method for measuring seepage velocity in hydrogeological parameters, in particular to a generalized tracer dilution method for measuring seepage velocity in a single hole. 2. Background technology [0002] It is a traditional method to measure the permeation flow rate by pumping test. The pumping experiment is based on the on-site measured data such as water output, water level drawdown, and pumping time, and uses relevant well flow theory to calculate the hydrogeological parameters such as the permeability coefficient and hydraulic conductivity of the aquifer. However, the pumping test disturbs the natural flow field, so that the measured permeability coefficient cannot reflect the real groundwater flow field. Moreover, the well flow theory used in the pumping test itself has problems of accuracy and application range. In addition, the pumping experiment still has troublesome operations in the implementation, and it ofte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/712G01P5/22G01V9/02
Inventor 陈建生董海洲
Owner HOHAI UNIV
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