RU33397U1 - Well Cleaning Device - Google Patents

Description

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Well Cleaning Device

The claimed technical solution relates to a means of cleaning wells from solid bulk materials (mechanical impurities): sand, clay, scale, small foreign objects, pieces of metal and cable. The device can be used in the oil industry for wells whose operation is complicated by the accumulation of heavy heavy sediments at the bottom.

During well operation and repair work, accumulation of mechanical impurities at the bottom and in the bottomhole formation zone occurs. This leads to overlapping filtration holes through which oil enters the well, reducing well productivity and reducing oil production. There are various methods and devices that serve to remove solids.

A device for cleaning wells is known, comprising sequentially installed tubing string (tubing), a storage container, a cylinder with a hollow piston connected to the container, a liner with a check valve connected to the cylinder, the hollow piston having side openings for fluid passage (see Patent RU No. 2160825, figure 2, IPC ЕВВ 37/00, publ. 20.12.2000).

A disadvantage of the known device is:

- one-time action: after cutting the screws and creating a depression on the formation, it is necessary to lift the device on the surface;

-the size of the extracted particles is limited by the diameter of the radial windows on the plunger;

- a sharp drop in pressure at the bottom of the well after cutting the screws, which in some cases can lead to emergency situations (crushing of the production string).

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RRE v111YaShvy Technical result achieved by the proposed device,

is as follows:

- reusable action (depression on the formation can be created repeatedly, until the storage container is completely filled with solid particles, without lifting the device to the surface);

-the size of the recoverable particles is much larger, because it is limited by the inner diameter of the pipes;

-the pressure at the bottom of the well can be reduced gradually by adjusting the speed of the piston.

The technical result is achieved in that in a device for cleaning wells containing a tubing string (tubing), a cylinder with a piston, a storage container, and a liner with a check valve, the pump piston is rigidly connected to the tubing string, and the storage container is located between cylinder and shank.

In addition, it can be equipped with a nozzle connected to the upper part of the cylinder coaxially with it and having a drain hole and a piston stroke limiter.

In addition, the tubing string may have a drain hole in the bottom.

The drawing shows the proposed device.

The device for cleaning wells contains a sucker rod pump, consisting of a fixed cylinder 1 several meters long and a piston 2 (plunger) connected through tubing rods 3 and an adapter 4 to the tubing string 5. A pipe 6 is attached to the top of the cylinder 1 and to the bottom - a storage container 7 of mechanical impurities, connected through a check valve 8 with a shank 9 ("feather").

The pipe 6 serves to guide the movement of the pump and compressor pipes 5, in the upper part has a piston stroke limiter 10 and a drain hole 11. The stroke limiter eliminates

2 the possibility of the piston output 2 nz pump. Through the drain hole 11

excess fluid is drained from the nozzle during the upward stroke of the plunger.

A drain hole 13 in the tubing 5 provides the discharge of fluid from the pipes when they rise to the surface without additional operations.

In addition, the dimensions (length) of the storage container 5 is calculated in advance based on the proposed amount of mechanical impurities, and is not limited in volume.

The device operates as follows.

When lowering the device, the shank 9 abuts against the face. The piston 2 rises with the aid of the FCT column 5, and the fluid with mechanical impurities through the open check valve 8 flows into the storage tank 7. After equalizing the pressure at the bottom and in the container 7, the check valve 8 closes and the device is removed from the well.

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Claims (4)

1. A device for cleaning wells containing a tubing string (tubing), a cylinder with a piston, a storage container and a liner with a check valve, characterized in that the pump piston is rigidly connected to the tubing string, and the storage container is located between the cylinder and shank. 2. The device according to claim 1, characterized in that it is equipped with a nozzle connected to the upper part of the cylinder coaxially with it and having a drain hole. 3. The device according to claim 1, characterized in that the pipe has a piston stroke limiter. 4. The device according to any one of claims 1 to 3, characterized in that the tubing string has a drain hole in the lower part.