Double-pipe piston type well washing device

Abstract

The utility model discloses a double-pipe piston type well washing device which is characterized by comprising a double pipe capable of being inserted into a well pipe, the double pipe comprises an air pipe and a water pipe arranged in the air pipe, the lower end of the air pipe is connected with the lower end of the water pipe in a sealed mode, the air pipe is connected with the water pipe through a plurality of connecting pieces, and an air injection structure is arranged on the lower portion of the air pipe. According to the double-pipe piston type well washing device, as the double pipes comprise the air pipe and the water pipe arranged in the air pipe, one tool can complete two modes of water washing and air lift reverse circulation, can perform positive circulation cleaning and air lift reverse circulation cleaning, and can be switched at any time and opened at the same time, so that the operation is simpler and more convenient, the cleaning process is simplified, the cleaning efficiency is high, and the well washing efficiency is improved. And the well washing time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of well-washing equipment for hydrological wells, in particular to a double-tube piston-type well-washing device. Background Art

[0002] The existing well-making process is to first drill a hole with a drilling rig, then lower the well pipe, and then fill the filter layer with gravel between the flower pipe and the aquifer, and then fill the water-stop layer with clay between the well pipe and the non-aquifer. Before pumping water, the well must be washed. The existing well-washing method is to lower an ordinary drill pipe into the well pipe for positive circulation to flush the mud and mud residue in the well, then pull out the drill pipe, replace another set of equipment to lower the air pipe for air lift reverse circulation well washing, until it is qualified. Generally, the whole well-washing process takes about 5-7 days.

[0003] The existing traditional well-washing process is relatively complicated, requiring two sets of equipment for positive circulation and reverse circulation, and the equipment is heavy and cumbersome to operate. Because there is no disturbance effect, the well is washed only by the flushing force of water flow, which is not clean and wastes water resources. The well-washing efficiency is very low, and it usually takes 5-7 days to complete the well-washing work.

[0004] The traditional well washing technology has the disadvantages of complex process, cumbersome operation, low well washing efficiency, long cleaning time, and can only clean the mud residue on the surface of the well wall, while the mud residue in the deep area is not easy to clean. Summary of the invention

[0005] In view of the shortcomings of the background technology, the technical problem to be solved by the utility model is to provide a double-tube piston well washing device which simplifies the washing process, has high washing efficiency, shortens the well washing time and cleans more thoroughly.

[0006] To this end, the utility model is implemented by adopting the following technical solutions:

[0007] The double-tube piston-type well washing device is characterized in that it includes a double tube that can be inserted into the well pipe, the double tube includes an air pipe and a water pipe arranged in the air pipe, the lower end of the air pipe is tightly connected with the lower end of the water pipe, the air pipe and the water pipe are connected by multiple connecting pieces, and an injection structure is provided at the lower part of the air pipe.

[0008] Furthermore, a piston is fixed to the outer ring of the lower part of the air pipe, the piston is arranged above the jet structure, and the piston includes a plurality of anti-slip supporting plates and rubber rings arranged at intervals, and the rubber rings and the anti-slip supporting plates are detachably connected.

[0009] Furthermore, the anti-slip support sheet is fixed to the air pipe by welding or threaded connection, and the rubber ring is detachably connected to the anti-slip support sheet by a plurality of screws.

[0010] Furthermore, the diameter of the rubber ring is greater than the diameter of the anti-slip support sheet.

[0011] Furthermore, a plurality of circles of jet structures are provided at the lower part of the trachea, and each circle of the jet structure includes a plurality of horizontal jet ports which are evenly spaced and distributed on the outer circle of the trachea.

[0012] After adopting the above technical solution, since the double pipe includes an air pipe and a water pipe arranged in the air pipe, a set of tools can complete both water washing and air lift reverse circulation. It can perform positive circulation cleaning and air lift reverse circulation cleaning, and can be switched at any time or started at the same time, making the operation simpler and more convenient, simplifying the cleaning process, improving the cleaning efficiency, and shortening the well washing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model has the following drawings:

[0014] Figure 1 This is a schematic diagram of the structure of the utility model after being inserted into the well pipe;

[0015] Figure 2 This is a schematic diagram of the internal structure of the double tube in the utility model;

[0016] Figure 3 This is a cross-sectional structural diagram of the jet structure in the utility model

[0017] Figure 4 It is a schematic diagram of the local structure of the lower part of the double tube in the utility model.

[0018] Figure numerals: 1. double tube; 2. air pipe; 3. water pipe; 4. connecting plate; 5. piston; 6. anti-slip support plate; 7. rubber ring; 8. horizontal jet nozzle; 9. well pipe; 10. flower pipe; 11. water-stop layer; 12. filter layer; 13. aquifer. DETAILED DESCRIPTION

[0019] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0020] Referring to the above-mentioned drawings, the double-tube piston-type well washing device provided by the utility model includes a double-tube 1 that can be inserted into a well pipe 9, the double-tube 1 includes an air pipe 2 and a water pipe 3 arranged in the air pipe 2, the lower end of the air pipe 2 is tightly connected with the lower end of the water pipe 3, the air pipe 2 and the water pipe 3 are connected by a plurality of connecting pieces 4, and an injection structure is provided at the lower part of the air pipe 2, a piston 5 is fixed to the outer ring of the lower part of the air pipe 2, the piston 5 is arranged above the injection structure, and the piston 5 includes a plurality of anti-slip support sheets 6 and rubber rings 7 arranged at intervals, and the rubber ring 7 and the anti-slip support sheet 6 are detachably connected, The anti-skid support sheet 6 is fixed to the air pipe 2 by welding or threaded connection, and the rubber ring 7 is detachably connected to the anti-skid support sheet 6 by multiple screws. The diameter of the rubber ring 7 is larger than the diameter of the anti-skid support sheet 6 to prevent the anti-skid support sheet 6 from scratching the well pipe wall. A plurality of circles of jet structures are provided at the lower part of the air pipe 2, and each circle of jet structures includes a plurality of horizontal jet ports 8 evenly spaced on the outer circle of the air pipe 2. The water pipe 3 is connected to the water pump, and the air pipe 2 is connected to the air pump. Since the air pipe 2 is separated into an annular airway by the water pipe 3, the air pump can be inserted into the annular airway together with the air pipe and the sealing gasket to realize ventilation of the air pipe 2.

[0021] The working principle of the utility model is as follows:

[0022] When the well pipe 9 is lowered and backfilled, the double pipe 1 with the piston 5 is lowered from the well pipe 9 to the bottom of the well; first, the water pipe 3 is opened to pass water, and the double pipe 1 is moved up and down at the same time, and the mud residue at the bottom of the well and the well wall is scraped, diluted and suspended under the up and down reciprocating action of the piston 5; after a period of time, the air pipe 2 is opened again to ventilate so that the horizontal jet nozzle 8 jets to disturb and flush the wall of the flower pipe 10 and the filter layer 12, and at the same time, an air lift reverse circulation effect is generated, so that the mud at the bottom of the well flows out of the wellhead quickly. Due to the rapid decrease in the specific gravity of the fluid in the well pipe 9, the water in the aquifer 13 will also quickly flow into the bottom of the well, and the mud residue in the filter layer 12 is also flushed in this process.

[0023] When the water flow in the wellhead is too fast, the water pipe 3 can be closed or the ventilation volume of the air pipe 2 can be reduced. The above process is repeated every 2-3 hours until the qualified requirements are met, that is, the well washing is completed. The entire well washing process is completed in about 1-2 days.

[0024] In this embodiment, since the double pipe 1 includes an air pipe 2 and a water pipe 3 arranged in the air pipe 2, a set of tools can complete both water washing and air lift reverse circulation. It can perform positive circulation cleaning and air lift reverse circulation cleaning. It can be switched at any time and can be started at the same time, making the operation simpler and more convenient, simplifying the cleaning process, high cleaning efficiency, and shortening the well washing time. In this device, under the three disturbance effects of the up and down reciprocating motion of the piston 5, the water flow washing at the bottom of the water pipe 3, and the horizontal jet washing, the mud residue at the bottom of the hole can be quickly brought out of the wellhead, and the mud residue in the deeper area can be cleaned. The cleaning efficiency is high, and the well washing process that originally took 5-7 days is shortened to 1-2 days.

[0025] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Double-tube piston type well washing device, characterized by: It comprises a double tube which can be inserted into a well pipe, the double tube comprises an air pipe and a water pipe arranged in the air pipe, the lower end of the air pipe is tightly connected with the lower end of the water pipe, the air pipe and the water pipe are connected by a plurality of connecting pieces, and an injection structure is arranged at the lower part of the air pipe.

2. The double-tube piston well-washing device according to claim 1 is characterized in that: A piston is fixed to the outer ring of the lower part of the air pipe. The piston is arranged above the jet structure, and the piston comprises a plurality of anti-skid supporting sheets and rubber rings arranged at intervals. The rubber ring and the anti-skid supporting sheet are detachably connected.

3. The double-tube piston well-washing device according to claim 2 is characterized in that: The anti-skid support sheet is fixed to the air pipe by welding or threaded connection, and the rubber ring is detachably connected to the anti-skid support sheet by a plurality of screws.

4. The double-tube piston well-washing device according to claim 2 or 3 is characterized in that: The diameter of the rubber ring is greater than the diameter of the anti-slip support sheet.

5. The double-tube piston type well washing device according to claim 4 is characterized in that: The lower part of the air pipe is provided with a plurality of circles of jet structures, and each circle of the jet structure includes a plurality of horizontal jet ports distributed at equal intervals on the outer circle of the air pipe.

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