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Finite difference method of fine simulation tubular well structure

A finite-difference, simulated tube technology, applied in complex mathematical operations, etc., can solve problems such as difficulty in achieving test results for test wells, differences in well-forming techniques, etc., and achieve fast and practical calculation methods and low-cost effects.

Inactive Publication Date: 2013-01-09
TONGJI UNIV
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  • Abstract
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Problems solved by technology

In order to deeply explore the impact of the tube well structure on work efficiency, if the field comparative test is used, due to the difference in the well formation process, a small number of test wells are difficult to achieve the test results, and the fine simulated well structure becomes the preferred economical and effective research method

Method used

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  • Finite difference method of fine simulation tubular well structure

Examples

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Embodiment 1

[0024] Example 1: The method of the present invention is illustrated below with the filter pipe being located in the complete well of the confined aquifer as an example, wherein the opening mode of the filter pipe is arranged in a circular character shape, and the opening rate is assumed to be 25%. For simplicity, it is assumed that the surface elevation is 0m, and the formation There are four layers in total, from top to bottom:

[0025] Layer: phreatic aquifer with a thickness of 5m and a water head of -2m;

[0026] Layer: waterproof layer, thickness 3m, water head -2m;

[0027] Layer: Confined aquifer, 10m thick, -2m water head, the layer where the filter tube is located;

[0028] layer; a water-resistant layer with a thickness of 2m and a water head of -2m.

[0029] 1, figure 1 It is the equivalent diagram of the filter tube. Figure a is the opening layout of the filter tube before the equivalent. The round holes are distributed in the shape of a square, and t...

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Abstract

The invention relates to a finite difference method of a fine simulation tubular well structure. The finite difference method of the fine simulation tubular well structure comprises the steps of: firstly performing finite difference grid division on a well computation space based on a research need and establishing a finite difference relationship of water balance on grid nodes; then performing value assignment of hydrogeological parameters on a ground layer where the well locates based on a practical project, setting a known water-head border or fixed water-head border and a water-isolating border at a well filter pipe to distinguish a well wall, a filter pipe hole, a filter pipe surrounding stuffing and a practical ground surface; then establishing a linear equation group of the water balance based on an underground water three-dimensional unsteady flow equation; and finally solving the equation through Gauss-Seide iteration to obtain water-head values of nodes. The finite difference method of the fine simulation tubular well structure, disclosed by the invention, has the advantages of being simple and efficient, and is suitable for finite difference value simulation design of any well fine structure.

Description

technical field [0001] The invention belongs to the fields of engineering hydrogeology, hydrology and water resources, and environmental geological engineering, and specifically relates to a finite difference method for finely simulating well structure (mainly referring to the opening mode, length, gravel filling and opening diameter of well filter pipes). Background technique [0002] When the deep foundation pit project depressurizes the confined aquifer, the surrounding stratum may have uneven settlement. The tube well recharge is an important active settlement control measure. The recharge well is composed of wellhead, well pipe, filter pipe and sand settling pipe , to correctly evaluate the working efficiency of the tube well, the filter tube of the reinjection well must be designed. According to previous engineering experience, the reinjection effect of the reinjection well is mainly related to the diameter, length and opening ratio of the filter tube in addition to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/11
Inventor 王建秀胡蒙蒙吴远斌汪沛田普卓隋东昌冯波
Owner TONGJI UNIV
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