RU196747U1 - WELL CLEANING DEVICE - Google Patents

Abstract

The technical solution relates to the field of oil and gas production, namely to devices for cleaning wells, and can be used to normalize the bottom of wells complicated by proppant plugs after hydraulic fracturing, cement crusts, foreign objects (fixing belts, bolts, wire, nickels from perforators). A device for cleaning a well, including a drilling nozzle sequentially connected from bottom to top, including an external and an internal cutter, a nozzle body equipped with a sleeve inserted movably into the nozzle body, a nut with an external mill fixed to it, a screw rotating in the body, with an internal mill on the end, a spring spreading the coupling and nut by the total stroke, an internal hollow piston, sludge containers with check valves in their lower parts, formed by tubing pipes, the whipping valve contains hydraulically th node, and channels are made in the piston. 3 s.p. f-ly, 2 ill.

Description

The technical solution relates to the field of oil and gas production, namely to devices for cleaning wells, and can be used to normalize the bottom of wells complicated by proppant plugs after hydraulic fracturing, cement crusts, foreign objects (fixing belts, bolts, wire, nickels from perforators).

The prior art device for cleaning wells from tight plugs (patent for utility model RU 79613, publ.: 01/10/2009 Bull. No. 1), which contains a housing, a piston installed in it with a central through channel and a bit. The housing is rigidly connected to the tubing, and screw grooves are made on the outer surface of the piston, in which, with the possibility of sliding, elements of the guide sleeve are rigidly connected to the housing. The helical grooves may include straight sections parallel to the longitudinal axis of the piston. The disadvantage of this device is the use of shock loads, which reduces the working life of the device, and tubing.

The closest in technical essence is a device for depressurization of wells (patent for utility model RU 174629, publ.: 10.24.2017 Bull. No. 30), consisting of a drilling device, a container with a check valve for sludge, a tubing string, a bypass and whipping valves. Between the drilling device and the check valve of the container there is a filter for collecting a large fraction of sludge, consisting of coaxially mounted nozzles, the inner nozzle of which has slotted holes and forms an annular receiving chamber with the outer nozzle. Direct flow regulator is installed between the bypass and relief valve. The disadvantage is that during operation of the device, the filter is clogged with sludge, which reduces the efficiency of absorption.

The objective of the utility model is to create a device (downhole arrangement) capable of destroying and removing plugs in the well in one tripping operation.

The well cleaning device has the following differences from existing structures:

- the unique design of the cultivator nozzle of an effective drilling plug in the borehole, providing the double action of a milling cutter-riber and an external crown with teeth (one-sided right rotation of the internal and external parts of the nozzle, preventing the tube from turning);

- the use of a channel system, preventing the passage of solid particles by crushing them into smaller ones, thereby allowing the installation of a hydraulic well cleaning device at a minimum distance from the cultivator nozzle, creating greater hydrostatic pressure, as well as avoiding jamming by solid particles of valve devices and a hydraulic cleaning device wells;

- the length of the teeth on the outer surface of the crown does not exceed 7-15 mm, thereby creating the effect of a hydraulic monitor during its operation;

- the increased frequency of the teeth and coating them with carbide brazing gives the best result when milling a hard surface;

- the outer crown is interchangeable of different diameters, which allows the use of this equipment in wells of different diameters with the replacement of only the crown, which increases the versatility of this equipment.

This problem is solved in that the well cleaning device, including a ripper nozzle connected in series from bottom to top, a slurry container with a check valve in the lower part, formed by tubing, a knockout valve, a ripper nozzle includes a housing, a crown with teeth, a milling cutter -reiber, screw shaft, freewheel, nut, spring, internal hollow piston equipped with channels for connecting the internal cavity of the piston with the internal cavity of the housing, while the channels are made at an angle of 12-15 ° to the axis along shnya nonparallel to each other, the device also comprises a hydraulic unit consisting of housing, shaft, nuts, sealing rings and shear pins. The milling cutter-riber and crown with teeth are interchangeable and rotate alternately during operation. The milling cutter-riber and crown with teeth are reinforced with carbide brazing.

The technical result provided by the given set of features is more effective in comparison with existing devices, the destruction of plugs and the absorption of drilled proppant, sludge.

A well cleaning device is used to normalize well bottoms complicated by proppant plugs after hydraulic fracturing, cement crusts, foreign objects, by mechanically destroying them and simultaneously filling the container from the pipes with destroyed fragments of the plug and bottomhole sludge. This device can also be used when flushing wells with both direct and reverse flushing.

The essence of the utility model is illustrated by drawings, which depict:

figure 1 is a General view of the drill nozzle,

figure 2 is a General view of the device for cleaning wells

Where

1 - milling cutter-riber

2 - crown with teeth

3 - nut

4 - screw shaft

5 - spring

6 - case

7 - freewheel

8 - nut

9 - internal hollow piston

10 - sub

11 - nozzle-ripper (drilling nozzle)

12 - poppet check valve

13 - tubing containers

14 - ball check valve

15 - hydraulic unit

16 - whipping drain valve.

The well cleaning device comprises a drilling nozzle (nozzle-ripper) 11, which consists of an external hollow body 6 and an internal movable hollow piston 9. A coupling sub 10 is screwed to the upper part of the piston 9 to connect the nozzle-ripper 11 to the tubing string (Tubing). A screw shaft 4 is fixed on the piston 9 in its lower part through an overrunning clutch 7. A nut 3 is fixedly fixed in the lower part of the housing, through which the shaft 4 and crown 2 with teeth reinforced with carbide brazed teeth pass. The crown with teeth 2 is interchangeable and can be made in different sizes. At the lower end of the shaft 4, a milling cutter-riber 1, reinforced with carbide brazing, is fixed. A spring 5 is put on the shaft 4 between the piston 9 and the nut 3. The piston 9 is provided with channels that prevent the passage of large solid particles, and thus preventing the valves and the device for well cleaning from jamming. The piston can have eight channels with a diameter of 12-20 mm at an angle of 12-15 ° to the axis of the piston that are not parallel to each other. The channels are not parallel to the axis of the device so that proppant lumps (sand) that are not destroyed by the milling cutter-riber additionally break into smaller particles when they collide with the channel walls. The number and size of channels are selected from design considerations to maintain the strength of the part, and so that the total passage section of the channels is maximum. Angle values can be selected empirically. Channels in the piston connect the internal cavity of the piston 9 to the internal cavity of the housing 6. Given this moment, it is possible to assemble the assembly at a minimum distance of the hydraulic unit from the nozzle-ripper to create greater hydrostatic pressure during operation.

Above the ripper nozzle 11 are: check valves 12 and 14 with containers from tubing 13, then a hydraulic unit 15 with a throttle, then again tubing 13 and a tap valve 16, all elements are interconnected by sub 10. are cylindrical adapters with threads at opposite ends (internal or external) and are used to connect device elements with different threads.

The device for cleaning wells hydraulic (UOSg) (hydraulic unit) 15 consists of a housing, shaft, nut, sealing rings and shear pins. The shaft is hollow, and has radial holes for fluid flow from the housing into the shaft. In the initial state, the shaft and the housing are located so that the holes are blocked by the housing and are fixed in this position by shear pins. For sealing in grooves, O-rings are placed on the shaft. At a certain axial force (depending on the diameter of the pins used), the pins are cut off, the shaft moves downward relative to the housing, the holes in the shaft extend outside the housing (into the sub) and the formation fluid flows into the shaft and further up the tubing string due to the hydrostatic effect .

Due to the use of the differential pressure of the fluid between the well and the air cavity, consisting of tubing pipes, on which the device descends into the well, when unloading the pipe string about the bottom of the well, the pins of the hydraulic unit are cut off and openings for the elements of the destroyed plug, fluid and sludge open. At the same time, the milling cutter-riber extends and rotates through the internal piston and the helical shaft, milling the plug. Milled cork elements due to depression are absorbed into the container from tubing pipes. During lifting, the non-return valve holds the elements of the destroyed plug and bottomhole sludge in a container of tubing pipes.

The device operates as follows.

The device descends to the bottom, the crown with teeth 2 abuts the cork, then under the weight of the tubing pipes the piston 9 enters the housing 6 and compresses the spring 5, while the shaft 4 passes through the nut 3, pushing the milling cutter 1, which rotates to the right for due to screw cutting on the shaft 5 and nut 3. Drilling of the tube by small diameter occurs. Next, the layout is lifted, while the spring 5 pulls the shaft 4 into the housing 6 in its original position. At the same time, due to the overrunning clutch 7, the milling cutter-riber 1 does not occur and at the same time the crown with the teeth 2 rotates to the right, together with the nut 3 and the housing 6, undermining the edges of the plug, which allows it to be more effectively destroyed. Overrunning clutch 7 does not allow the shaft to rotate in the opposite direction to the left, which prevents the turnaround of the pipes. Both the milling cutter-riber 1 and the crown with teeth 2 work with rotation to the right. When passing solid particles through a system of channels in the piston, they split into smaller particles due to the design and hydrostatic pressure during operation.

With an increase in unloading due to the weight of the pipes, the pins in the hydraulic unit are cut off and holes are opened that communicate with the internal cavity of the tubing pipes above the layout (initially empty). At the same time, due to the hydrostatic pressure of the borehole fluid, the elements of the destroyed plug, fluid and sludge enter (suction) into the container from the tubing through the holes in the nut 8, the cavity between the shaft 4 and the housing 6 and the channels in the piston 9. a throttle is integrated in the hydraulic unit of the well cleaning device (an element with a reduced bore hole). The non-return valve does not allow the collected elements of the cork and sludge to go back, while, when repeating the cycle, it allows to suck in a new portion of the sludge.

After complete drilling of the plug, the device is lifted. To drain excess fluid from the tubing string, a metal rod is thrown into the string, which breaks the radially located screw in the knockout valve, while the excess liquid above the knockout valve merges, and the collected sludge and plug elements remain in the container from the tubing located below the knockout valve .

Thus, the claimed technical solution:

- provides more efficient drilling of plugs due to the new design of the nozzle-ripper;

- is a mobile device (universal) due to the replaceable working part;

- prevents complications in the process of work due to the grinding of solid particles;

- carries out an increase in the penetration rate when the plugs are destroyed due to a change in the design of the milling cutter-riber and nozzle with teeth (coating with carbide material, more frequent teeth and the choice of optimal tooth height);

- allows you to reduce the time during normalization of the bottom on a complicated fund of wells in the presence of solid plugs and leads to cost savings in the implementation of ongoing and overhaul of wells;

- allows you to completely remove the sludge and parts of the cork (they are sucked), preventing formation contamination by cleaning products (compliance with environmental standards).

Claims (3)

1. A device for cleaning a well, including a ripper nozzle connected in series from bottom to top, a slurry container with a check valve in the lower part, formed by tubing, a whipping valve, characterized in that the ripper nozzle includes a housing, a crown with teeth, a milling cutter a riber, a helical shaft, a freewheel, a nut, a spring, an internal hollow piston equipped with channels providing a connection between the internal cavity of the piston and the internal cavity of the housing, while the channels are made at an angle of 12-15 ° to the axis of the piston parallel to each other, the device also contains a hydraulic unit consisting of a housing, a shaft, a nut, o-rings and shear pins. 2. The well cleaning device according to claim 1, characterized in that the milling cutter-riber and the crown with teeth are interchangeable and rotate alternately during operation. 3. The device for cleaning wells according to claim 1, characterized in that the milling cutter-riber and the crown with teeth are reinforced with carbide brazing.

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