RU9473U1 - WELL VALVE DEVICE - Google Patents

Abstract

I) (19) Russian Federation

(54) Downhole valve device

(57) Purpose: to expand the technological capabilities of the device during the operation of wells by deep electric centrifugal pumps with high operational reliability. Essence: B case 1 with input 2 and output 3 holes (O) made axial working (PK) 4 and drain (SK) 5 channels. SK 5 in the upper part is connected with PK 4 through a continuous through KB and connected with the annular space of radial O 7, above which a saddle 8 with a ball 9 is installed in SK 5. SK 5 above the ball 9 is made with a bore. In the transition from KB to O 3, a movement limiter 10 of ball 9 is installed. And in RK 4, a stop element is installed. Ball 9 moves from SK 5 to RK 4 and vice versa, thereby allowing for the implementation of various technological operations in the well. general circulating center. Namely: well borehole, drainage of fluid from the tubing during their ascent, treatment with chemicals during dewaxing of the tubing, transfer of the well to the flowing mode, etc. 1 ill.

ESSAY

Description

BOTTOM VALVE APPARATUS The utility model relates to the oil industry, in particular, to downhole valve devices used in wells. equipped with deep electric injection pumps (ESP) and are intended for carrying out such technological processes as killing and flushing oil wells, draining liquid from a column of lifting pipes when lifting them, carrying out work on dewaxing of tubing and tubing with chemical solvents, etc.

Known downhole valve device, which

installed on the tubing string above the check valve of the downhole pump. The known device is used for killing wells before repair. The device comprises a housing with vtop and outlet openings. A radial hole is made in the side wall of the housing, in which a fitting is fixed, the elongated end of which is located in the internal cavity of the housing. When carrying out repairs before. how to start lifting the deep pump from the well, a metal rod is thrown into the pump pipes, which, hitting the end of the fitting, flakes it, opening an opening for draining the liquid from the pump pipes (see AA. Bogdanov. Submersible centrifugal electric pumps for oil production. M. Heiroa., 1968, p. 53-54).

However, in the known device, the discharge of liquid from the pump pipes before they rise is very long (about 10-12 hours), since

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zDiaMerp holes for the United States are significantly smaller than the bore of the housing and is about 5-8 mm. If debris or mechanical impurities get into the device with a liquid flow, the possibility of no sticking from pipes is eliminated, and pipes must be lifted to the surface with liquid. As a result, the complexity of the work, a violation of the environment.

In addition, the known device does not provide multiple use. For the last subsequent descent of equipment into the well, the broken fitting is replaced with a new one.

Besides. the known device is generally inoperable and even larger than a scrap. pulled down in

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well for cleaning pipes from paraffin. When the scraper falls onto the nozzle, the latter breaks, the drain hole opens. and the pump is forced to work on its own.

Known downhole valve device. a housing that is eccentrically mounted relative to the column of lifting pipes, inside of which there is a locking element in the entire cezcia with a spring-loaded shutter, a shank with channels connected to the lower part of the shutter, a spring-loaded cup with a ball lock installed to interact with the housing and the shank (see a .s. USSR Hi 1 i 02898, class E 21 B 34/06, 1982)

The main disadvantage of the known device is its eccentric location relative to the column of lifting pipes, which limits its use, since it requires a guaranteed cross-section in the annulus for its installation. In addition, the known device is difficult in design, requires retouching of elastic elements to ensure the integrity of the entire system. Therefore, valve leakage is not ruled out

devices, clogging of channels in the presence of paraffin and abrasive

particles in the liquid, which reduces the operational over the daosg device.

The closest in technical essence to the claimed is a downhole valve device mounted on the lower end of the column of lifting pipes above the submersible electric centrifugal pump, comprising a housing with inlet and outlet openings and with axial working and drain channels made inside the housing, and a shut-off element is installed in the drain channel and the drain channel is connected with the annulus by a radial hole (see AS of the USSR No. 416 506, class F 16 K 17/36, from 1971).

However, this known device also has low operational reliability due to the impossibility of reusing the device without having it to the surface and restoring it to its original state. For the same reason, the known device has limited technological capabilities when operating wells with deep electric centrifugal pumps, since it does not ensure the operation of the well in the periodic pumping mode, the well cannot be switched from the pump mode to the flowing mode, and the possibilities of its operation during dewaxing of tubing with chemicals are limited.

In addition, the process of fluid flow with a known device when the pipe string is removed from the well is long, since the radial hole in the drain channel is made much smaller than the inlet in the housing.

The purpose of the utility model is to expand technological

the device’s capabilities when operating wells with deep electric centrifugal pumps while ensuring high operational reliability.

This goal is achieved by the fact that in the well-known downhole valve device comprising a housing with inlet and outlet openings and with axial working and drain channels made inside the housing, while the shut-off element is installed in the drain channel and the drain channel is connected to the annulus by a radial hole, new the fact that the shut-off element is made in the form of ceipia with a ball placed above it and is installed in the drain channel above the radial hole, the drain valve in the lower part is closed and above the shut-off organ it is made with a boring, drain and working channels in the upper part communicated with a continuous radial channel and with a Koonvca outlet opening. and the lower part

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the working channel is in communication with the inlet of the housing, while in the cavity of the working channel there is a locking element partially overlapping the passage section of the working channel, and a ball limiter is installed in the transition from the through radial channel to the outlet of the housing.

Due to the fact that the working and drain channels are interconnected, and the locking element is made in the form of a saddle with a ball placed above it, it became possible to freely move the ball from the drain channel to the working one, all the way into the locking element, and vice versa: from the working channel to the drain - before landing on the saddle, which allows for various technological operations in the well, namely:

-killing the well;

- draining fluid from the tubing during the lifting of the pipe string;

-transfer of the well from pump mode to flowing mode;

-treatment with chemicals during dewaxing of KKT and equipment;

-periodic operation of the well.

The implementation of the locking body in the form of a ball allows you to make the passage sections of the saddle, the working channel, as well as the inlet and radial holes close in size, which, firstly, provides unhindered mixing of the ball in the channels, and secondly, can significantly reduce the time for killing the well and simplify the process her shtlenie. since the bore of the rathsal hole is made large.

The implementation of the drain channel over the locking element with the bore allows for a small and gradual increase in pressure in the annulus during the accumulation of fluid, with the pump turned off, the fluid flow does not transfer the ball from the drain channel to the working one, but allows the ball to float in this space above the saddle, thanks to why the column of fluid is retained in the tubing and does not merge into the annulus,

Performing at the entrance of the output channel of the housing the ball restriction eliminates the sticking or removal of the ball into the outlet, and the installation of a stop element in the working channel allows you to limit the zone of ball movement in the working channel, thereby ensuring the optimal mode of moving the ball from one channel to another and vice versa.

The dryness of the utility model is illustrated by the drawing, which shows the downhole valve device, the general view.

The device comprises a housing I, with input 2 and output 3 holes. In the housing 1, axial working 4 and drain 5 channels are offset from the center. The drain channel 5 is muffled in the lower part, and in communication with the working channel in the upper part

4 by a non-through radial channel 6. A drain channel 5 is connected to the casing space by a radial hole 7. Above which, a locking member is installed in the drain channel 5 in the form of a saddle 8 and a ball placed above it 9. The lateral surface of the drain channel

5 on the locking body is made with a bore. In the transition from the non-through radial channel 6 to the outlet 3, a limiter 10 for moving the ball 9 is installed, made, for example, in the form of a vertically mounted plate. In the cavity of the working channel 4 is installed perpendicular to the locking element 1 i, made, for example. in the form of a rod partially overlapping the passage section of the channel 4. and the lower part of the channel 4 is aligned with the inlet 2 of the housing 1. In the outlet 3 there is a tip 12.

The device is mounted on the lower end of the lifting pipes and is mounted above the check valve of the submersible electric centrifugal pump.

The device operates as follows.

When the pipe string is lowered into the well with a downhole valve device fixed to them, the fluid flow through the radial hole 7 enters the drain channel 5 and moves the ball 9 into the working channel 4 until it stops in the stop element 11. As a result, fluid from the annulus enters through the opening 7 , channels 5 and 6, the outlet 3 and the tip 12 in the tubing.

The fluid moves back from channel 4 through channel 6 to the drain channel 5 and sits tightly on the net 8. As a result, the squeezed space of the well is separated from the pipe above the valve device, and the fluid from the well is pumped into the tubing.

In the case of periodic operation of the well, at a time when the liquid level in the annulus drops, the pump is turned off, the check valve of the pump is closed. The ball 9 is located in the seat 8, the drain channel 5 is closed, thereby the column of fluid is held in the tubing above the valve device.

With a slight and gradual increase in pressure in the annulus, the ball 9 rises above the saddle 8 and begins to float in the space of the drain channel 5 above the shut-off element, and the column of liquid is held in the tubing without merging through the radial hole 7 into the annulus.

To carry out work on dewaxing of tubing and processing, if necessary, the bottom-hole zone of the formation with chemicals, the valve device operates as follows.

When the pump is off, the ball 9 is in the saddle 8, the column of liquid is held in the tubing. The pressure in the tubing is sharply reduced, as a result of which the ball 9 from the drain channel 4 moves to the working channel 4. Also, the ball 9 can be transferred to the working channel 4 by pumping any liquid, for example, water, oil, through the radial hole 7 into the drain channel 5 and moves it to the working channel 4. Then, the chemical reagent is pumped by the pumping unit in the required volume into the tubing, leaving the pipes for a long time to react.

To process the pump and the bottomhole formation zone with chemicals, the pump is briefly turned on, ball 9 sits on the saddle 8, after which the pump is turned off. The chemical reagent through the pump in the required volume will fall into the bottomhole formation zone.

In semi-gushing wells, reservoir conditions (pressure,

productivity coefficient, gas factor) when creating a sufficient depression allow you to switch from pump operation to flowing. In such conditions, both the pump and the reservoir work, so the ball 9 is in the correct position — in the channel 6. The pump is turned off, the ball 9 from the channel 6 is mixed into the working channel 4, and the well continues to gush through the radial hole 7, the drain channel 5, tip 12 in tubing.

Production tests of the inventive downhole valve device in wells equipped with submersible electric centrifugal pumps showed that the device operates reliably in various technological modes of the well, namely: during periodic operation of the well; when killing a well; when draining fluid from the tubing during the lifting of the pipe string to the surface; when processing chemicals tubing string; with dewaxing. as well as when switching a well from pump mode to gushing.

The inventive device allows you to naturally (3-4 times) to reduce the time of killing a well by increasing the flow area of the valve, and when dewaxing to reduce the consumption of a chemical agent by at least 3 times, because solvent supply goes directly to the tubing. Switching a well from a pump to a flowing operation mode saves energy. In addition, the environment in the fields is improved and oil spills are prevented by ensuring complete drainage of liquid from the tubing during recovery.

Head of Patent Licensing Sector / PermNIPIneft TL Yushkina

Claims (1)

A downhole valve device comprising a housing with inlet and outlet openings and with axial working and drain channels made inside the housing, wherein a shut-off element is installed in the drain channel and a drain channel is connected to the annulus by a radial hole, characterized in that the shut-off element is made in the form of a saddle with a ball placed above it and installed in the drain channel above the radial hole, the drain channel in the lower part is muffled, and above the locking element is made with a bore, the drain and working channels in the upper part they communicate with each other through a radial channel and with the outlet of the housing, and the lower part of the working channel is communicated with the inlet of the housing, while a stop element is installed in the cavity of the working channel, partially covering the passage section of the working channel, and in the transition from the through radial channel a ball limiter is installed in the outlet of the housing.