RU47960U1 - DEVICE FOR PROCESSING LIFT PIPES OF THE PRODUCING WELL - Google Patents

Abstract

The utility model relates to the field of exploitation of oil and gas wells and can be used to flush all types of wells without stopping the production lift. The device comprises an elevator pipe string with a flushing valve installed in its composition. The column is placed in a well equipped with a faceplate and fountain fittings, ensuring the supply of flushing fluid through the annulus. A flushing valve is integrated in the pipe tubing string. A nozzle and a cable entry are installed in the faceplate, located at an angle of 180 ° in plan with respect to the nozzle. On the outside of the pipe tubing string there is a pipe string of small diameter that communicates the inlet of the flushing valve with a pipe. The upper section of the pipe string of small diameter is equipped with a flexible high-pressure hose, with which it is directly connected to the pipe. Using the utility model reduces the cost of processing by reducing the required volume of flushing fluid, the amount of chemicals, reducing heat loss.

Description

The utility model relates to the field of exploitation of oil and gas wells and can be used to flush all types of wells without stopping the production lift.

During the operation of wells, deposits (usually paraffin) accumulate on the inner surface of the string of elevator pipes (tubing), narrowing its bore, up to its complete overlap (cork formation). To prevent overlapping of the flow cross section of elevator pipes, heat treatments are used using well dewaxing units (ADP) or pumping with heated liquids using cementing aggregates (CA), as well as processing with chemical reagents. However, given that the submersible pump is usually installed at a great depth, the pumped liquid, reaching the depth of the submersible pump, loses its temperature and the desired effect — melting of paraffin is not achieved.

A device is known for processing elevator pipes of a producing well, comprising an elevator pipe string with a flushing valve installed therein, located in a well equipped with a faceplate and fountain fittings, for supplying flushing fluid through the annulus and a flushing valve in the pipe elevator followed by a flushing outlet liquid to the surface (RU 2089718, publ. 1997).

The known device allows, if necessary, the transition to direct or reverse flushing of the elevator column by supplying flushing fluid through the pipe or annular space of the well. However, the force that triggers

the flushing valve is not amenable to adjustment and the valve locking element moves from one position to another under the influence of excess pressure in a particular space of the well.

A device is known for processing elevator pipes of a producing well, comprising an elevator pipe string with a flushing valve installed therein, located in a well equipped with a faceplate and fountain fittings, for supplying flushing fluid through the annulus and a flushing valve in the pipe elevator followed by a flushing outlet liquid to the surface (Downhole valve device. Prospect VDNH, PO Tatneft, VNIIOENG No. 4010, Moscow, 02.26.1985).

This known device allows you to adjust the force, under the action of which the flushing valve is activated, however, in the presence of a high permeability of the formation, a low level of fluid in the annulus of the well, backwashing can lead to undesirable absorption of flushing fluid by the formation, its increased flow rate, which limits its scope.

The technical result of the utility model is to reduce the cost of processing the elevator pipes of a producing well by reducing the required volume of flushing fluid and chemicals.

The specified technical result is achieved in that a device for processing elevator pipes of a producing well, comprising an elevator pipe string with a flushing valve installed therein, located in a well equipped with a faceplate and fountain fittings, for supplying flushing fluid through the annulus, a flushing valve in the elevator the pipe string with subsequent exit to the day surface is equipped with a nozzle installed in the faceplate and a pipe string of small diameter located oh from the outside of the pipe tubing string and communicating

the inlet of the flushing valve with a pipe, and the upper section of the pipe string of small diameter is equipped with a flexible high-pressure hose with which it is directly connected to the pipe.

Contributes to the achievement of the technical result that:

- the faceplate has a cable entry located at an angle of 180 ° in relation to the nozzle through which the cable of the submersible pump is passed, attached to the pipe string with its own clamps opposite to the pipe string of small diameter;

- a pipe string of small diameter is attached to the pipe string with clamps;

- the flushing valve includes a housing integral with the connecting element of the tubing string pipe column having an internal thread in the upper part and an external thread in the bottom for connecting with the tubing pipe coupling and a spring-loaded ball valve cooperating with the flushing valve seat.

Figure 1 shows a diagram of a device; figure 2 - enlarged node a in figure 1.

The device comprises an elevator pipe string 1 with a flushing valve installed in its structure including a housing 2, made integrally with a connecting element of the pipe pipe elevator 1, having an internal thread in the upper part and an external thread in the lower part for connecting to the pipe coupling 3 of the pipe coupling 1 and a spring-loaded ball 4 of the ball valve 5 interacting with the seat of the flushing valve. An elevator pipe string 1 is located in the well, which is equipped with a faceplate 6 and fountain fittings 7. A nozzle 8 is installed in the faceplate 6. A pipe string 9 of small diameter is located on the outside of the lift pipe string 1. The upper section of the pipe string 1 of small diameter is equipped with a flexible hose 10 of high pressure, with which it is directly connected to the pipe 8. The pipe string 9 of small diameter is attached to the elevator pipe string 1

the clamps 11 and communicates the inlet of the flushing valve with the nozzle 8. The faceplate 6 has a cable entry 12 located at an angle of 180 ° in relation to the nozzle 8. A cable 13 of the submersible pump 14 is passed through the cable entry 12, attached to the pipe lift pipe 1 with its own clamps 15 opposite to the pipe string 9 of small diameter. The pipe 8 is equipped with a high-pressure valve 16, fountain fittings 7 with a root valve 17, a lateral branch 18 with a valve 19. The high-pressure flexible hose 10 is selected so that its length is sufficient to exclude an exact adjustment of the position of the upper end of the pipe string 9 of small diameter after assembling it. Pipes 9 are screwed using couplings 20. A flushing valve in the well is installed in the formation zone.

The device operates as follows. In the case of occurrence during operation of a production well on the inner surface of its column of elevator pipes 1 of deposits, the elevator pipes 1 are processed. To do this, flushing fluid is pumped through the pipe 8 into the pipe string 9, which is isolated from the annulus. The flushing liquid squeezes the shutter 5 of the flushing valve, enters the tubing string 1 and, in the form of an upward flow, acts on the deposits, eroding and dissolving them. The process of processing elevator pipes by flushing takes place without affecting the reservoir. At the end of the flush, the shutter 5 returns to its original position.

Using a utility model reduces the cost of processing by reducing the required volume of flushing fluid, the amount of chemicals, reducing heat loss.

Claims (5)

1. A device for processing elevator pipes of a producing well, comprising an elevator pipe string with a flushing valve installed therein, located in a well equipped with a faceplate and fountain fittings, for supplying flushing fluid through the annulus, a flushing valve in the pipe elevator with a subsequent outlet on the day surface, characterized in that it is equipped with a nozzle installed in the faceplate and a string of pipes of small diameter located on the outside of the elevator howl pipe string and informs the flush valve inlet to the nozzle, the upper portion of the column of small diameter pipe equipped with a flexible high-pressure hose to which it is directly connected with the branch pipe. 2. The device according to claim 1, characterized in that the pipe string of small diameter is attached to the pipe string with pipe clamps. 3. The device according to claim 1, characterized in that the faceplate has a cable entry located at an angle of 180 ° in plan with respect to the nozzle. 4. The device according to claim 3, characterized in that a submersible pump cable is passed through the cable entry, attached to the pipe string with its own clamps opposite to the pipe string of small diameter. 5. The device according to claim 1, characterized in that the flushing valve includes a housing integral with the connecting element of the pipe tubing string having an internal thread in the upper part and an external thread in the bottom for connecting to the pipe tubing coupling and a spring-loaded ball shutter interacting with the flush valve seat.