RU8405U1 - IMPLOSION WELL CLEANING DEVICE - Google Patents

Abstract

1. An implosion device for cleaning wells, comprising a casing-trap with a sealed cavity mounted on a tubing string, a check valve and a purge valve, characterized in that it is equipped with a packer device mounted on a tubing string between the tubing-trap and a cleaning valve and made with a blind axial channel in which the end of the pipe for supplying the reagent is located, and a through channel communicating the cavity of the casing-trap with a valve valve cavity, and the blind axial channel ene with the annular prostranstvom.2. The device according to claim 1, characterized in that the blind axial channel is in communication with the annulus through a filter mounted on the tubing string. The device according to PP. 1 and 2, characterized in that between the packer device and the cleaning valve is a telescopic adapter. 4. An implosion device for cleaning wells, comprising a casing-trap with a sealed cavity mounted on a column of tubing, a check valve and a cleaning valve, characterized in that the cleaning valve is made in the form of a hollow plunger with one plugged end placed in the cylinder mounted on the column tubing, the muffled end of the plunger provided with radial windows and mounted on the cylinder with shear screws, and its open end mounted on the casing-trap, a sealed cavity otorrhea plunzhera.5 communicated with the cavity. The device according to claim 4, characterized in that a seal is located between the end of the plunger and the cylinder. An implosion device for cleaning wells, containing mounted on a

Description

Well cleaning implosion device

(options)

The proposal relates to the operation and repair of wells and can be used to clean wells from sludge, mud deposits and slag plugs, metal objects, etc.

A device for cleaning wells is known (RU, patent 2061174, class E 21 B 37/00, 1996). The known device does not provide the entry into it of a large volume of sludge and mud deposits.

The closest analogue is a device for cleaning a well, containing a casing-trap with a sealed cavity mounted on a column of pumping pipes, a check valve and a cleaning valve (RU, patent 2068078, class E 21 V 37/00, 1996).

A disadvantage of the known device is that it does not provide complex work at one descent of the suspension of tubing, chemical treatment of the formation and cleaning of reaction products. The objective of the invention is to ensure revenue

large volumes of sludge deposits, carrying out complex work with a single descent of the suspension of tubing, hardening; design improvement and improving the efficiency and speed of cleaning.

The task is achieved due to several options for the implementation of the implosion device.

In the first embodiment, the task is achieved due to the fact that the device is equipped with a packer device,

mounted on a tubing string between

a casing-trap and a cleaning valve, and made with a blind axial channel in which the end of the pipe for supplying the reagent is located, and a through channel communicating the cavity of the casing-trap with a valve valve cavity, and the blind axial channel is in communication with the annulus.

In addition, the blind axial channel can be communicated with the annulus through a filter mounted on the tubing string, and a telescopic adapter is located between the packer device and the valve with 2.1.

This device allows you to carry out a number of technological operations for processing the formation in a comprehensive manner.

The task in the second embodiment is achieved by the fact that the cleaning valve is made in the form of a hollow plunger with one plugged end placed in a cylinder mounted on a tubing string, and the plugged end of the plunger is provided with radial windows and mounted on the cylinder with shear screws, and open it

2 end is fixed on the casing-trap, the sealed cavity of which

communicated with the cavity of the plunger.

In addition, a seal is located between the end of the plunger and the cylinder.

The task in the third embodiment is achieved by the fact that the cleaning valve is equipped with a latch made in the form of separate segments movable in the axial and radial directions, which are installed with the possibility of interaction with a locking ball and a stop fixed with one

sides on the valve body with shear pins, and with

the other is on a trap casing, and the purge valve seat is spring-loaded and axially movable, and the inner surface of the casing is provided with a bore that allows radial movement of the retainer segments.

In addition, the segments of the latch can be made in the form of a split ring. In this case, the latch may consist of a series of segments that form a ring.

The essence of the proposal is illustrated by drawings, where:

figure 1 presents an embodiment with a packer device;

figure 2 presents an embodiment with a cleaning valve in the form of a hollow cylinder;

figure 3 is a view aa in figure 2;

figure 4 is an embodiment with a cleaning valve and a latch;

3 in FIG. 6 is a view BB of FIG. 5.

The device according to the first embodiment (Fig. 1) comprises a tubing string (tubing), an adapter 2 with sealing elements 3, a pipe 4 for supplying a reagent, a casing-trap 5 of a tubing string, a sleeve b connecting the casing-trap 5 with a casing-trap 7, rubber seals 8, special packer device 9, blind axial channel 10, telescopic adapter 11, purification valve 12, casing-sludge trap 13, check valve 14,

adapter 15, shank or filter 17, filter 18 and valve 19

to relieve pressure.

P1plosion device (Fig. 1) descends to standard tubing-2.5 or 3, if the formation is required to be treated with acid, PAF and other chemical methods, after cleaning the reaction products and conducting a smooth inflow call by swabbing. All this is done with one run of the tubing with implosion installation on the face.

The installation diagram is as follows.

The lower part is a shank or a filter 17 through an adapter 15 is connected to the casing pshamoulovatel 13, inside which there is a check valve 14; then comes the cleaning valve 12, the same as in figure 2 or figure 4 (for cleaning the bottom).

Pipes 4 with a diameter of 1.5 are lowered into the blind channel 10, the internal outlet of which is combined with the annulus of the well through which reagent is fed from the wellhead into the formation. Sealing pipes 4 of the casing-trap 7 and the pipe string 4 completely

4 is achieved during the descent and is supplemented with rubber at the top

elements 3; above the casing-trap 7 there is a circulation valve and tubing suspension to the mouth.

The device (figure 1) rg. Works as follows.

The installation descends to the reservoir. The required reagent is pumped through pipes 1 and through pipes 4 into the formation, maintained for reaction, then the suspension is unloaded to the bottom, the telescopic adapter 11 is triggered, the pins are cut off and the casing-trap 7 is filled due to the pressure drop

reaction products. Without lifting the tubing suspension, is made

swabbing, through the circulation valve, fluid in the well is taken, a smooth transition of pressure to the reservoir is created, an inflow call. If necessary, the well is examined for inflow with depth gauges and the suspension with an implosion installation rises to the mouth.

Thus, the uniqueness of this type of installation lies in the fact that during a single tubing descent operation, a number of technological operations are performed — treatment of the formation, mechanical cleaning of the reaction products, smooth flow output by swabbing, and hydrodynamic studies if necessary. Such a technological, integrated approach when working on wells with PRS, KRS teams using an implosion device has not been done before.

The device according to the second embodiment (figure 2) contains a tubing string 20 with a casing-trap 21, a valve 22, drain holes 23, a cleaning valve made in the form of a hollow plunger 24 with a plug end 25, placed in

5

a cylinder 26 with shear screws 27. A seal 28 is installed between the cylinder 26 and the plunger 24. Radial windows 29 are formed on the side of the muffled end 25 on the plunger 24. A check valve 30 is installed at the inlet to the treatment valve. An adapter 31 is installed between the casing trap 21 and the plunger 24.

The device shown in figure 2 is lowered into the well on standard tubing - 2.5 or 3.

The device descends to the bottom, and the tubing suspension is unloaded slowly, at this moment the shear screws are cut off

27, the plunger moves with tubing suspension and trap cover 21

downward, and at this moment the radial windows 29 open, the vacuum cavity of the casing-trap 21 is depressurized. The well fluid containing mechanical impurities penetrates the casing-trap 21 at high speed under the influence of an instantly created pressure drop, filling its volume. Then the suspension rises and the non-return valve 22 prevents the discharge of dirt or sludge back to the face, all trapped rises at the mouth. When dismantling the installation, the casing-trap 21 is cleared of dirt and sludge.

The device according to the third embodiment (figure 4) consists of tubing 32, a casing-trap 33, adapters 34, a pressure relief valve 35, a check valve 36 with a stopper 37 and a cleaning valve.

The cleaning valve is equipped with a latch 38, which consists of separate axially and radially movable segments 39, a locking ball 40, an abutment 41 fixed to the housing 42 with a shear pin 43 and a trap casing 33. The cleaning valve seat 44 is movable and preloaded by an adjustable spring 45 . The spring 44 is regulated by a compression nut 46. Tightness

elements provided by seals 47. On the housing 42 is made boring 43, providing radial movement of the segments 39.

The device according to the third embodiment works as follows.

The tubing suspension is unloaded to the bottom, the pins 43 are cut, the emphasis 41 moves downward moving the retainer ring 38 down along with the ball 40. Reaching 48 boring segments 39 of the retainer

38 diverge, freeing the ball 5, and due to the pressure drop from

the bottom hole to the camera-trap 33, the ball 5 rushes up, freeing the passage for fluid from the reservoir.

In the design of this device there is no place for fitting, the fluid flow is straight-through, the resistances are minimal, the fluid smoothly flows around the ball 5 from all sides, thereby filling the entire chamber of the casing-trap 33 more densely.

To reduce water hammer on the walls of the chamber trap 33, the valve 35 opens from above, the pressure is released and, when the chamber pressure and the bottom hole are equalized, the valve ball 35 and ball 5 fall into their seats, preventing dirt, sludge, and solution from flowing out of the chamber-trap 33. If additional work is required to call the inflow from the formation; swabbing, fluid and annular circulation to the tubing through slotted holes above the circulation valve 35 are performed. Then the suspension rises at the mouth.

The advantage of this device is that there is resistance to fluid flow during chamber depressurization7

traps 33 minimum compared to other similar

devices. This is achieved through the use of a ball valve with a seat and once-through fluid passageways. The entrained flow is fluid: and when the pressure drop is not in its direction. This device with this principle can be used when removing emergency pipes, pump, cable, hose, etc. At the end of the installation below the check valve 36, special traps should be installed for this. Due to the sharp pressure drop, special traps capture emergency equipment and are removed at the mouth, while it is recommended that the tubing suspension be replaced with special drill pipes for emergency operations.

It is possible to carry out work with this device for cleaning the formation, the regulation of depression on the formation is carried out by the volume of the trap chamber, by the number of pipes NKT-3. For the effectiveness of the work on cleaning the formation, if the well curvature allows this, they can use simple packers, which are sealed from unloading the tubing suspension to the bottom, together with the implosion installation.

A distinctive feature of all the presented options for implosion devices from existing similar devices and methods such as hydroprotectors, hydraulic vacuum installations is that it is possible to carry out a series of works at the well to increase its productivity. These are treatment of the formation and cleaning of the bottom, removal of reaction products from treatments, the challenge of a smooth inflow by the swabbing method, research with depth gauges. Due to this, time is reduced almost 3-4 times

work on the well with foremen or cattle brigade leaders.

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Claims (8)

1. An implosion device for cleaning wells, comprising a casing-trap with a sealed cavity mounted on a tubing string, a check valve and a purge valve, characterized in that it is equipped with a packer device mounted on a tubing string between the tubing-trap and a cleaning valve and made with a blind axial channel in which the end of the pipe for supplying the reagent is located, and a through channel communicating the cavity of the casing-trap with a valve valve cavity, and the blind axial channel en to the annulus.  2. The device according to claim 1, characterized in that the blind axial channel is in communication with the annulus through a filter mounted on the tubing string.  3. The device according to paragraphs. 1 and 2, characterized in that between the packer device and the cleaning valve is a telescopic adapter.  4. An implosion device for cleaning wells, comprising a casing-trap with a sealed cavity mounted on a column of tubing, a check valve and a cleaning valve, characterized in that the cleaning valve is made in the form of a hollow plunger with one plugged end located in a cylinder installed on the tubing string, the plugged end of the plunger provided with radial windows and mounted on the cylinder with shear screws, and its open end mounted on the casing-trap, a sealed cavity which communicates with the cavity of the plunger.  5. The device according to claim 4, characterized in that between the end of the plunger and the cylinder there is a seal.  6. An implosion device for cleaning wells, comprising a casing-trap with a sealed cavity mounted on a column of tubing, a check valve and a cleaning valve, characterized in that the cleaning valve is provided with a latch made in the form of separate segments axially and radially movable, installed with the possibility of interaction with a locking ball and an emphasis fixed on one side to the casing of the cleaning valve by shear pins, and on the other - on the casing-trap, and the seat of the cleaning valve olneno spring biased and movable in the axial direction, and the inner surface of the housing is provided with a bore which provides the possibility of radial movement of the retainer segments.  7. The device according to claim 6, characterized in that the segments of the latch are made in the form of a split ring. 8. The device according to claim 6, characterized in that the latch consists of six segments forming a ring.