Double-packer layered water pumping device and method

Abstract

The invention discloses a double-packer layered water pumping device and method. The device comprises a drill pipe column located in a bored well, the drill pipe column is provided with a first packer, the first packer is in a cylindrical shape, and provided with an annular inner cavity, and the drill pipe column is wrapped in the inner cavity. The outer wall of the inner cavity is made of an elastic material, the top of the inner cavity is connected to a high pressure gas cylinder arranged outside the bored well through a high pressure gas pipeline, and the top can deform outwards to be enlarged in the radial direction under the effect of high pressure gas. A submerged pump is fixedly arranged at the bottom of the drill pipe column, a water outlet pipe of the submerged pump is located inthe drill pipe column, and the tail end of the water outlet pipe is located outside the well. A cable of the submerged pump penetrates through the inner cavity of the first packer, and is connected with power supply equipment outside the well. The double-packer layered water pumping device can not only simplify layered water pumping test construction difficult, lowers the construction cost, but also is reliable in packing, and the obtained hydrogeological parameters are more accurate.

Description

technical field [0001] The invention belongs to the technical field of hydrogeological survey and exploration, and in particular relates to a double-packer layered pumping device and method. Background technique [0002] In the hydrogeological survey and groundwater exploration, the detailed hydrogeological parameters of the groundwater can be accurately obtained through the layered pumping test, and the data of the chemical field, dynamic field, and temperature field of the aquifer in space can be obtained to realize the layered description of the aquifer. Objectively understanding hydrogeological conditions, accurately describing aquifers, rationally generalizing hydrogeological models, establishing mathematical models of groundwater systems, and more accurately evaluating groundwater resources play a vital role. [0003] Due to the limitations of technology and equipment, most of the current domestic hydrogeological holes are single holes, and there are few layered holes....

AI Technical Summary

Problems solved by technology

The disadvantages are: ①Due to the large number of variable diameters, the well structure is complex, and the drilling construction cost is relatively high; ②The water sealing effect of the tray is unstable, and the reliability of the hydrogeological parameters obtained is poor; ③The data line of the real-time monitoring probe cannot pass through the tray The water stop can not monitor the water level change of the pumping target layer in real time; ④ If the pumping test is carried out in more than 3 layers, the well structure is too complicated

Its disadvantages are: ① It usually takes 24-48 hours for the expansion rubber to achieve the water-stopping effect, the auxiliary time is long, and the efficiency is low; ② It is impossible to carry out the layered pumping test of more than 2 layers; It is not easy to put clay balls into the upper end of the object, resulting in poor water sealing effect; ④The data line of the real-time monitoring probe cannot pass through the expansion rubber, and the water level change of the pumping target layer cannot be monitored in real time

[0006] The above two traditional layered pumping methods are difficult to implement, high in cost, and the well structure is complicated. At the same time, the temporary water stop effect is not reliable, which will have a great impact on the hydrogeological parameters of the aquifer.

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