A layered pumping method

Abstract

The invention provides a layered water pumping method. The method comprises the steps of diving a water-pumping hole into corresponding n segments according to the number of aquifer segments, conducting graded broaching, tripping in waterproof pipes into the segments, from the first segment to the (n-1) segment, of the water-pumping hole for conducting isolated water stopping, tripping in an n water-pumping pipe in the n segment of the water-pumping hole for pumping water, after water pumping succeeds, pulling out the n water-pumping pipe, and using cement slurry for closing the n segment of the water-pumping hole starting from the hole bottom; then completing the water pumping test for the n segment of the water-pumping hole. Then the water pumping test is conducted in sequence from the (n-1) segment to the first segment of the water-pumping hole according to the method. By means of the layered water pumping method, disturbance toward the hole wall of a water-pumping hole caused by frequent ascending and descending of waterproof pipes in a conventional method can be decreased to the greatest extent, water pumping test failure caused by collapse of the water-pumping hole can be effectively avoided, and the success rate of the water pumping test is greatly raised; the construction period can be shortened, the cost can be lowered, the labor intensity can be reduced, and the working efficiency can be improved.

Description

technical field [0001] The invention relates to a layered water pumping method, which is especially suitable for layered water pumping in weak formations of coal fields, and belongs to the technical field of layered water pumping methods for geological exploration holes. Background technique [0002] Layered pumping is a technology often used in hydrogeological work. Its advantage is that it does not need to drill multiple boreholes, and only one borehole is needed to separate the water at different depths of the stratum (one depth section can include multiple boreholes). Aquifer intervals) are independently pumped out, so that the hydrogeological characteristics of aquifer intervals at different depths in a specific location can be quickly and inexpensively understood. [0003] There is a stratified pumping method in the prior art, comprising the following steps: [0004] 1) Prepare the pumping hole; first, drill the pumping hole or expand the completed geological explorat...

AI Technical Summary

Problems solved by technology

[0012] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect that the layered pumping method in the prior art needs to disturb the pumping hole for many times, which is easy to cause the pumping hole to collapse, so that the pumping test cannot be completed, thereby providing a method for the pumping hole. The layered pumping method that can quickly complete the pumping test due to fewer disturbances and less risk of collapse