CN111764851A

CN111764851A - Reverse circulation hole washing device and method

Info

Publication number: CN111764851A
Application number: CN202010813371.7A
Authority: CN
Inventors: 熊威; 赵肖芒; 尧凯; 杨俊�; 徐腾; 陈建国; 陈龙辉
Original assignee: Hunan Zhonghe Exploration Co ltd
Current assignee: Hunan Zhonghe Exploration Co ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2020-10-13

Abstract

The reverse circulation hole washing device comprises a drain pipe, a U-shaped pipe, an air pipe and an air compressor, wherein the air compressor is connected with one end of the air pipe, the other end of the air pipe is connected with one port of the U-shaped pipe, the other port of the U-shaped pipe is located in the drain pipe, and the U-shaped pipe is fixedly connected with the drain pipe. The invention also comprises a hole washing method implemented by using the reverse circulation hole washing device. The invention has simple structure and convenient use; the hole washing method implemented by utilizing the reverse circulation hole washing device has the advantages that: the wind pressure can not be in direct contact with the stratum or the sleeve, so that the stability of the stratum is effectively protected, and the collapse of a drill hole is avoided; in a drill hole with large water burst, impurities at the bottom can be more effectively cleaned through negative pressure suction; the position of the reverse circulation device can be adjusted according to the hole depth and the water level in the hole, and the hole washing efficiency is improved.

Description

Reverse circulation hole washing device and method

Technical Field

The invention relates to a hole washing link in a drilling construction process of a uranium mine in-situ leaching uranium mining process, in particular to a reverse circulation hole washing device and a reverse circulation hole washing method.

Background

The ground leaching process drill hole is the only channel for metal mining of the ground leaching sandstone type uranium mine. The channel is composed of a sleeve, a filter and a sand setting pipe from top to bottom, is a working channel for forming hydraulic connection between the earth surface and a water-containing layer, and is called a production column. In the drilling construction process, cement slurry or MTC (machine type communication) grouting is required to be filled in an annular space between the inner wall of an open hole drill hole and the outer wall of a drill hole sleeve for well cementation and sealing. Therefore, the interior of the uranium mining casing pipe can be completely isolated from each layer of underground water system, and water flow is kept smooth only through the interior of the casing pipe and from the earth surface to the filter, so that the aim of mining the target layer metal is fulfilled.

In the process of drilling construction and pore forming by the ground leaching process, a link called as hole washing is provided, namely sediment, rock debris, thick slurry, a small amount of well cementation cement slurry and the like at the bottom of a drill hole are discharged from the drill hole. As the holes are filled with water, mud, rock debris, sand and other substances, and the sediment is larger towards the bottom of the holes, the weight is larger. In actual production, the precipitates affect the pore-forming quality of the drilled hole and the production run, so these impurities must be removed.

The existing hole washing method is 'gas lift circulation', namely, an air pipe for washing holes is put down to a specific position, generally 50-80m above a filter, compressed air enters a drilled hole through the air pipe by using an air compressor, and impurities such as slurry, rock debris, settled sand and the like in the hole are discharged along an orifice by using air pressure, and the existing hole washing method has the defects that: 1. as the depth of the drilled hole is deepened, the required pressure is higher, and the hole washing time is also increased; 2. the air pipe is directly placed into the drill hole, and high-pressure air pressed into the air pipe exerts certain pressure on the hole wall to destroy the stability of the hole wall; 3. when the water inflow of the drilling hole is large, the impact disturbance of the compressed air on the hole bottom is limited, and the hole washing quality cannot meet the requirement.

Disclosure of Invention

The invention aims to solve the technical problem of providing a reverse circulation hole washing device and a method which can effectively improve the hole washing speed and quality and improve the whole drilling quality on the basis of not damaging surrounding rocks at the bottom of a hole.

The positive circulation drilling is that the flushing medium is conveyed to the bottom of the hole through the inner cavity of the drill rod, suspended and carried with the drilling slag, and then returned to the ground through the annular space between the drill rod and the hole wall, so as to realize slag discharge and wall protection. Reverse circulation drilling refers to a drilling method in which a flushing medium flows from an annular space between a drilling tool and a hole wall to the bottom of the hole, carries drilling slag and returns to the ground surface from an inner hole of the drilling tool. The invention utilizes the principle of reverse circulation drilling to form a reverse circulation working device in the hole washing device, thereby achieving the purpose of hole washing.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides a hole device is washed in reverse circulation, includes row's thing pipe, U-shaped pipe, tuber pipe and air compressor machine, the air compressor machine is connected with the one end of tuber pipe, the other end of tuber pipe is connected with a port of U-shaped pipe, another port of U-shaped pipe is located row's thing intraductal, and U-shaped pipe and row thing pipe fixed connection.

Further, the calandria pipe is an iron pipe. And two ends of the calandria pipe are provided with screw threads so as to connect the assembling pipe fittings by a locking handle. Because the U-shaped pipe stretches into the blow-off pipe, the void space in the pipe is reduced, so that a 'well' -shaped anti-blocking net needs to be welded at the bottom of the pipe and is made of reinforcing steel bars, and larger particle impurities are prevented from entering the U-shaped pipe to cause blocking. The pipe fitting is machined into an arc shape at the position of the orifice so that the mixture of silt, rock debris, thick mud and the like can be discharged more easily, and the outlet of the pipe fitting and a water pipe are connected to the mud pit.

Further, the U-shaped pipe is made of an iron pipe. An anti-falling structure is arranged at one port of the U-shaped pipe; the anti-falling structure is in a fish scale shape. Of course, the shape of the U-shaped tube can be adjusted as appropriate.

Further, the air pipe is a PE pipe. And the wall of the air pipe is provided with a depth mark. And the wall thickness of the air pipe is selected according to the hole washing pressure.

The hole washing method implemented by the reverse circulation hole washing device comprises the following specific processes: firstly, installing a pipe fitting into a drilled hole, then installing a reverse circulation hole washing device, continuously installing the pipe fitting to the hole opening, after the installation is completed, opening an air compressor, enabling compressed air to reach the hole opening along an air pipe, a U-shaped pipe and a drain pipe, and driving a mixture of bottom sand, rock debris, thick slurry and the like to return to the hole opening through negative pressure until water returning of the drilled hole is clear.

Further, the reverse circulation hole washing device is arranged at a position 200-220m away from the liquid level of the slurry.

The reverse circulation hole washing device has simple structure and convenient use; the hole washing method implemented by utilizing the reverse circulation hole washing device has the advantages that: the wind pressure can not be in direct contact with the stratum or the sleeve, so that the stability of the stratum is effectively protected, and the collapse of a drill hole is avoided; in a drill hole with large water burst, impurities at the bottom can be more effectively cleaned through negative pressure suction; the position of the reverse circulation device can be adjusted according to the hole depth and the water level in the hole, and the hole washing efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a reverse circulation hole-cleaning apparatus according to the present invention;

FIG. 2 is an enlarged view of a part of the reverse circulation hole-washing device according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a part of the reverse circulation hole-washing device according to an embodiment of the present invention;

in the figure: 1. the anti-blocking device comprises a drainage pipe, 2. a U-shaped pipe, 3. well cementing materials, 4. an air pipe, 5. a stratum, 6. a casing, 7. an air compressor, 8. dilute slurry, 9. a mixture of silt, rock debris, thick slurry and the like, 10. an ore bed, 11. a water pipe, 12. a fish scale-shaped anti-blocking structure, 13. a screw thread and 14. a well-shaped anti-blocking net.

Detailed Description

The invention is further illustrated by the following examples and figures.

Example 1

Referring to fig. 1-3, a reverse circulation hole washing device comprises a drain pipe 1, a U-shaped pipe 2, an air pipe 4 and an air compressor 7, wherein the air compressor 7 is connected with one end of the air pipe 4, the other end of the air pipe 4 is connected with one port of the U-shaped pipe 2, the other port of the U-shaped pipe 2 is located in the drain pipe 1, and the U-shaped pipe is fixedly connected with the drain pipe 1.

In this embodiment, the utility model provides a calandria pipe 1 is phi 42mm iron pipe, the screw thread 13 is processed at the both ends of calandria pipe 1 to the locking hand connects the equipment pipe fitting, has welded "well" word anti-blocking net 14 in the bottom, is made by the reinforcing bar, prevents that great granule debris from getting into U-shaped pipe 2 department and causing the jam. The pipe is machined into a circular arc shape at the position of an orifice, so that the mixture 9 of silt, rock debris, thick slurry and the like can be discharged more easily, and the outlet of the pipe and a water pipe 11 are connected to a slurry pond.

In this embodiment, the U-shaped pipe 2 is made of an iron pipe with a diameter of 20mm and a wall thickness of 4mm, one end opening of the U-shaped pipe 2 is processed into a fish scale-shaped anti-falling structure 12, and the U-shaped pipe 2 and the calandria pipe 1 are welded firmly. Of course, the shape of the hairpin tube 2 can also be adjusted as appropriate.

In this embodiment, the air pipe 4 is a PE pipe with a diameter of 40mm, and the pipe wall is provided with a depth mark. The wall thickness of the air pipe 4 is selected according to the hole washing pressure.

The hole washing method implemented by the reverse circulation hole washing device comprises the following specific processes: when a hole needs to be washed in a drilling hole, one end of the air pipe 4 is heated and softened and is connected with the fish scale-shaped anti-falling structure 12 of the U-shaped pipe 2, so that the anti-falling and sealing are ensured; firstly, installing a lower iron pipe into a drill hole (hoisting and fixing), then installing a reverse circulation hole washing device, and then continuously installing an upper iron pipe to the hole opening, wherein the reverse circulation hole washing device is installed at a position 200-220m away from the liquid level of the thin mud 8, after the installation is finished, opening an air compressor 7, compressing air to reach the hole opening along an air pipe 4, a U-shaped pipe 2 and a discharge pipe 1, and driving a mixture 9 of bottom silt, rock debris, thick mud and the like to return to the hole opening through negative pressure until the return water of the drill hole is clear.

Claims

1. The utility model provides a hole device is washed in reverse circulation which characterized in that: including calandria pipe, U-shaped pipe, tuber pipe and air compressor machine, the air compressor machine is connected with the one end of tuber pipe, the other end of tuber pipe is connected with a port of U-shaped pipe, another port of U-shaped pipe is located calandria intraductally, and U-shaped pipe and calandria pipe fixed connection.

2. The reverse circulation hole-washing device according to claim 1, wherein: the calandria pipe is an iron pipe.

3. The reverse circulation hole-washing device according to claim 1 or 2, wherein: two ends of the calandria pipe are provided with screw threads so as to connect the assembling pipe fittings by a locking handle; the bottom of the calandria pipe is provided with a 'well' -shaped anti-blocking net.

4. The reverse circulation hole-washing device according to claim 1 or 2, wherein: the U-shaped pipe is made of an iron pipe.

5. The reverse circulation hole-washing device according to claim 1 or 2, wherein: an anti-falling structure is arranged at one port of the U-shaped pipe.

6. The reverse circulation hole-washing device according to claim 5, wherein: the anti-falling structure is in a fish scale shape.

7. The reverse circulation hole-washing device according to claim 1 or 2, wherein: the air pipe is a PE pipe.

8. The reverse circulation hole-washing device according to claim 1 or 2, wherein: and the wall of the air pipe is provided with a depth mark.

9. A hole washing method implemented by using the reverse circulation hole washing device of any one of claims 1 to 8 is characterized by comprising the following specific processes: firstly, installing a pipe fitting into a drilled hole, then installing a reverse circulation hole washing device, continuously installing the pipe fitting to the hole opening, after the installation is completed, opening an air compressor, enabling compressed air to reach the hole opening along an air pipe, a U-shaped pipe and a drainpipe, and driving a mixture of bottom silt, rock debris and thick slurry to return to the hole opening through negative pressure until water returning of the drilled hole is clear.

10. A method of hole washing as claimed in claim 9, wherein: the reverse circulation hole washing device is arranged at a position 200-220m away from the liquid level of the slurry.