SU1232778A1 - Apparatus for cleaning wells from sand plugs - Google Patents

Description

2. Device 11. 1, tl to

Of course, the check valve is designed as a sleeve with an annular protrusion and axial channels:

The invention relates to the oil and gas industry, namely, devices for cleaning sand plugs in a well.

Known pulp-lifting; 51e well cleaning systems containing an ejector and a pulp-lifting collector l.

The disadvantages of these installations are low efficiency and complexity.

A device for cleaning wells from sand plugs is known, comprising a housing, a nozzle that forms an annular channel for supplying industrial fluid with the housing, an ejector, the cage of which is connected to the annular channel and the axial passage of the nozzle, and opening the plug 2.

However, the proposed device is effective only at depths of 9-23 m. In addition, the drawbacks of the device are an increase in head loss and a decrease in efficiency with an increase in the depth of the well being cleaned. Moreover, it can not be used for the development of wells and breakdown of dense and powerful traffic jams.

The purpose of the invention is to increase the efficiency and efficiency when cleaning deep wells by reducing the amount of liquid head.

The goal is achieved in that the device for cleaning wells from sand plugs, comprising a housing, a branch pipe forming an annular channel for supplying flushing fluid with the body, an ejector, the pressure chamber of which is connected to the annular channel and the axial channel of the branch pipe, and a loosening unit concentric with the ejector, an additional ejector is installed with a pipe that forms a gaseous agent with the kienal pipe, and a check valve is installed at the bottom of the annular channel of the pipe and the casing.

along its periphery, installed with; the possibility of axial movement when supporting it to the bottom.

2

Moreover, the check valve is made in the form of a sleeve with an annular protrusion and axial channels along its periphery, installed with the possibility of axial movement when it is supported on the bottom.

FIG. 1 shows the proposed device in the process of cleaning a well; in fig. 2 - device with a closed valve; in fig. 3 is a section A-A in FIG. 1.

The device includes a housing 1, a pipe 2, which forms an annular channel 3 with the case, an ejector 4 with a pressure chamber 5, an ejector 6 with a pipe 7, which forms a channel 8 with a pipe 2 to transfer the gaseous agent. The ejector nozzles and the nozzle are connected by a lid 9 having corresponding protrusions for fixing the nozzles.

A rock crown is installed in the lower part of the device.

10 with a profile hexagonal surface and a check valve, made in the form of a sleeve 11 with annular projections 12 and axial channels 13

and a sealing ring 14,

The device works as follows.

Before starting the cleaning or development of the well with the help of a swivel, in the chambers of the ring ejectors 4 and 6 respectively, the flushing fluid and compressed air are supplied. until it stops crown 10 in traffic. With this bushing

11 rises to the upper position, forming with the crown 10 an annular ejector, to which the washing liquid is supplied to wash out the plug. At the same time, the flushing fluid enters the ring ejector 4, which, (creating a vacuum under the ejector.

 sucks the slurry and feeds it into the slurry pipeline (axial channel of body 1).

Passing through the axial channel of the housing 1, the pulp is saturated with compressed air and drained to the surface in aerated form. Combined pumping is performed using a jetting device and airlift simultaneously.

If it is necessary to drill tight plugs, the torque is transmitted to the crown 10 through a string of pipes.

During well completion, the check valve under its own weight is in the lower position and closes the ejector for flushing

plugs, and the flushing fluid completely enters the ejector 4. due to a vacuum under the ejector, sucks the pumped liquid, and with the help of the ejector 6, air-lift pumping is provided.

Combined pumping of the pulp allows, by reducing the head, to increase the efficiency and efficiency of the installation during the cleaning and development of deep wells. In addition, pumping of the pulp directly from the surface (without penetration under the airlift) is provided, which eliminates the penetration of wells intended for airlift development.

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Editor A. Shishkin

Compiled by T. Wojtuh

Tehred M. Khodanich Proofreader A. Ferenc

Order 2746/32 Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Fig.Z

Claims (2)

1. DEVICE FOR CLEANING WELLS FROM SAND GASES, comprising a housing, a nozzle forming an annular channel for supplying washing liquid to the housing, an ejector whose pressure chamber is connected to the annular channel and the axial channel of the nozzle, and a tube loosening unit, characterized in that In order to increase the efficiency and efficiency when cleaning deep wells by reducing the pressure of the fluid, an additional ejector is installed concentrically to the ejector with a pipe forming a channel for supplying a gaseous agent with a pipe, and in the lower Asti annular nozzle channel and housing a check valve. Fig} 2. The device according to π. 1, characterized in that the check valve is made in the form of a sleeve with an annular protrusion and axial channels: [at its periphery, installed with the possibility of axial movement when it is supported by the bottom.