RU51396U1 - DEVICE FOR CLEANING A WELL FROM A SAND STOCK - Google Patents

Abstract

The proposal relates to the oil and gas industry and can be used for maintenance and overhaul to clean wells of sand plugs. A device for cleaning a well from sand plugs consists of a housing, at the upper end of which there is a cable termination. A check valve with an adjustable spring is placed in the cable termination. Additional radial channels and radial channels are made at the lower end of the housing. The bottom of the device is muffled. Radial channels are blocked by a shoe made in the form of a hollow cylinder, and additional radial channels are blocked by a nozzle, while a spring is installed between the nozzle and the hollow cylinder. The hollow cylinder and pipe have the possibility of limited axial movement relative to the housing. The outer diameter D _{1 of the} nozzle is larger than the outer diameter D _{2 of the} casing, while the nozzle with its outer surface is configured to tightly interact with the inner diameter D _{3 of the} inner protrusion of the wellhead installed at the wellhead. Sealing elements ensure tightness when emptying the device and are installed on the outer surfaces of the pipe and housing. The proposed device has a simple design that eliminates the unauthorized operation of the shoe, which allows with sufficient high efficiency to clean the well from sand plugs, and thus reduce the duration and cost of repair work.

Description

The proposal relates to the oil and gas industry and can be used for maintenance and overhaul to clean wells of sand plugs.

A device for cleaning the bottom of the well from sand plugs (copyright certificate SU No. 901476 IPC 7 E 21 V 37/00 publ. Bull. No. 4 dated 01/30/1982), consisting of a housing with a receiving valve, a piston rod, the piston is sealed with a cuff relative to the body, wellhead outlet, while the receiving valve is located in the piston, and a float valve with a spring-loaded seat is installed above the piston, and the body is made with channels above the spring-loaded seat at the level of the wellhead.

The disadvantages of this device are:

- firstly, the complexity of the design, due to the large number of nodes and parts. In addition, the wellhead is technologically difficult to manufacture and use.

- secondly, the cuff wears out quickly in an aggressive environment (abrasive, sand, sludge), with which it directly contacts in the process of cleaning the bottom of the well, in connection with which the efficiency of the device decreases sharply.

The closest in technical essence to the proposed is a device for cleaning wells from sand plugs (copyright certificate SU No. 1186787 IPC 7 E 21 V 37/00 publ. Bull. No. 39 dated 23.10.1985), including wellhead with internal protrusion, a casing with a check valve and radial channels for alignment with the channel of the wellhead outlet and axially movable shoe, the casing having radial channels and the shoe made in the form of rigidly interconnected lower part of the bushes concentrically mounted relative to one another and the body forming the annular cavity and the spring-loaded nozzle installed in the annular cavity with the outer annular protrusion for interaction with the upper ends and the protrusion of the wellhead, while the sleeves are installed with the possibility of overlapping an additional radial channel of the housing, and the nozzle with the possibility of overlapping the radial channel of the housing .

The disadvantages of this device are:

- firstly, the complexity of the design, due to the large number of nodes and parts, and as a result, the complexity of manufacturing and assembly;

- secondly, when the device is lowered into the well, premature additional radial channels of the housing can be opened prematurely, if atmospheric pressure remains in the annular cavity where the spring is installed, and vice versa, when lifting, if there is liquid below the bushings, a “piston effect” will be created ", Which counteracts the compression of the spring, while the additional radial channels may not overlap the bushings, which together reduces the efficiency of the device for cleaning wells from sand plugs.

The objective of the utility model is to simplify the design of the device and increase the efficiency of the device.

The problem is solved by the proposed device for cleaning a well from a sand plug, including a wellhead outlet with an internal protrusion, a housing with a check valve and radial channels for alignment with the wellhead channel, as well as additional radial channels, an axially movable shoe, a spring-loaded nozzle having the ability overlapping radial channels of the housing, sealing elements.

New is that the shoe is made in the form of a hollow cylinder with the possibility of overlapping additional radial channels of the housing, the outer diameter D _{1 of the} nozzle being larger than the outer diameter of D _{2 of the} housing, and the nozzle with its outer surface has the ability to tightly interact with the inner diameter of D _{3 of the} inner protrusion of the wellhead outlet, and sealing elements that provide tightness when emptying the device are installed on the outer surfaces of the pipe and housing.

The figure shows a device for cleaning wells from sand plugs in longitudinal section.

A device for cleaning a well from sand plugs consists of a housing 1, at the upper end of which there is a cable termination 2. In the cable termination 2 there is a check valve 3 with an adjustable spring 4. Additional radial channels 5 and radial channels 6 are made at the lower end of the body 1 device enclosure is muffled. Radial channels 6 are blocked by a shoe made in the form of a hollow cylinder 7, and additional radial channels 8 are blocked by a pipe 9, while a spring 10 is installed between the pipe 9 and the hollow cylinder 7. The hollow cylinder 7 and the pipe 9 have the possibility of limited axial movement relative to

case 1. The outer diameter D _{1 of the} pipe 9 is larger than the external diameter D _{2 of the} body 1, while the pipe 9 with its outer surface is made with the possibility of tight interaction with the inner diameter D _{3 of the} inner protrusion 11 of the wellhead 12 mounted on the wellhead 13. Sealing elements 14 and 15 ensure tightness when emptying the device and are installed on the outer surfaces of the pipe 9 and the housing 1. Unauthorized flow of fluid from the housing 1 is prevented by sealing elements 16.

A device for cleaning wells from sand plugs is as follows.

The wellhead 12 is passed upward through the cable termination 2 connected to the cable 17. After that, the cable termination 2 is screwed onto the upper end of the housing 1. The device is lowered into the well 13 and the wellhead 12 is secured to the mouth.

Next, the device using the rope 17 of the geophysical elevator (not shown in Fig.) Is lowered into the well 13. When the device is lowered below the liquid level in the well, the cavity of the housing 1 remains tightly closed and inaccessible to liquid penetration, thanks to the sealing rings 16 that are installed on the mating surfaces the pipe 9 and the hollow cylinder 7 with the housing 1.

When a shoe made in the form of a hollow cylinder 7 with a sand plug on the bottom of the well comes into contact, the housing 1, under the action of its own weight, falls down, compressing the spring 8, and additional radial channels 5 open. Under the influence of the hydrostatic pressure of the liquid column in the well 13, sand is intensively sucked in into the internal cavity of the housing 1. After this, the devices through the rope 17 begin to lift up. At the time of lifting the device, the hollow cylinder 7 under the influence of its own weight and the return force of the spring 8 falls down and overlaps the additional radial channels 5, separating the internal cavity of the housing 1 from the environment in the well.

In the process of lifting the device, the compressed air generated when the inner cavity of the housing 1 is filled with water-sand mixture leaves through the check valve 3 until it reaches the pressure to which the check valve 3 is adjusted. From practical experience, this is 0.1-0.3 MPa. Pressure is intended for intensive emptying of the device. When the device reaches the wellhead 13, the pipe 9 with its outer surface of diameter D ₁ tightly interacts with the inner diameter D _{3 of the} inner protrusion 11 of the wellhead 12. Further, the rope 17 continues to be pulled upward, while the pipe 9 abuts against the inner protrusion 11 of the well 12 Again pull the rope 17

up, as a result, the pipe 9 is knocked down, compressing the spring 8. The radial channels 6 are opened and the excess air pressure in the inner cavity of the housing 1, the sand is forcibly ejected through the channels 18 of the wellhead 12.

The proposed device has a simple design that eliminates the unauthorized operation of the shoe, which allows with sufficient high efficiency to clean the well from sand plugs, and thus reduce the duration and cost of repair work.

Claims (1)

A device for cleaning a well from a sand plug, including a wellhead outlet with an internal protrusion, a housing with a non-return valve and radial channels for alignment with the wellhead channel, as well as additional radial channels, an axially movable shoe, a spring-loaded pipe having the ability to overlap the radial channels of the body , sealing elements, characterized in that the shoe is made in the form of a hollow cylinder with the possibility of overlapping additional radial channels of the housing, the outer diameter the meter D _{1 of the} nozzle is larger than the outer diameter D _{2 of the} body, while the nozzle with its outer surface has the ability to tightly interact with the inner diameter D _{3 of the} inner protrusion of the wellhead outlet, and sealing elements that ensure tightness when emptying the device are installed on the outer surfaces of the nozzle and the housing.