Tube well gravel pack layer with washing function

Abstract

The invention relates to a tube well gravel pack layer with a washing function, which consists of gravel packs and a plurality of stainless steel pipes and is characterized in that a plurality of pores are formed in the part, which corresponds to a filter, of each stainless steel pipe; the stainless steel pipes with the pores are used as passages and high pressure gas is filled or high pressure water is injected into the stainless steel pipes, so that washing on the gravel pack layer can be implemented on the ground and even washing on the position of an on-site layer which is in contact with the gravel pack layer and is easy to form mud cakes in the shaft sinking process can be implemented, and thus, the difficult problem of permanent plugging of the gravel pack layer is solved, the gravel pack layer can be enabled to be in an excellent working state for a long time, and the service life of a well is also greatly prolonged. Due to successful implementation of the tube well gravel pack layer with the washing function, part of gas carried in recharge water also can be discharged and the problem of gas phase plugging is relieved, so that the decay rate of the quantity of water recharge is retarded; and meanwhile, an important method with strong operability and a good maintenance effect is provided for daily maintenance of a recharge well.

Description

Technical field [0001] The invention relates to a tube well gravel pack with flushing function, in particular to a refill well gravel pack with flushing function. This gravel pack is equipped with a cleaning channel and can be used on the ground. Cleaning is convenient, fast and efficient. Background technique [0002] The use of tube wells for groundwater artificial recharge has been widely used to increase groundwater recharge sources, stabilize groundwater levels, control ground subsidence, change groundwater temperature to provide cold and heat sources for production and life, improve groundwater quality, and recharge groundwater heat pump systems. . [0003] However, in the process of groundwater recharge, the recharge water volume decreases and the water level rises. That is to say, when a certain recharge water volume is maintained, as the recharge time increases, the recharge water level in the well gradually or rapidly rises. , Even water overflows from the wellhead; whe...

AI Technical Summary

Problems solved by technology

However, with the increase of the service life of the reinjection well, the reinjection water volume still tends to decline, and even some reinjection wells cannot be filled with water after several years of use.

This shows that the clogged part of the well is not limited to the holes (slits) and the inner wall of the filter, and the gravel layer outside the filter will also slowly foul, and at the same time, it is easy to fill with debris and gravel, and the filling The blockage in the gravel layer is difficult to clean or even impossible to clean, forming a permanent blockage, which makes the amount of recharge water less and less until no water can be recharged, causing the recharge well to fail to work normally and shortening the life of the well. service life

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