RU2629290C1 - Method of well operation (versions) and devices for its implementation - Google Patents

Method of well operation (versions) and devices for its implementation Download PDF

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Publication number
RU2629290C1
RU2629290C1 RU2016125131A RU2016125131A RU2629290C1 RU 2629290 C1 RU2629290 C1 RU 2629290C1 RU 2016125131 A RU2016125131 A RU 2016125131A RU 2016125131 A RU2016125131 A RU 2016125131A RU 2629290 C1 RU2629290 C1 RU 2629290C1
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RU
Russia
Prior art keywords
pump
valve
shaft
electric centrifugal
shut
Prior art date
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RU2016125131A
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Russian (ru)
Inventor
Алексей Владимирович Трулев
Светлана Викторовна Черняк
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ЗАО "Римера"
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Priority to RU2016125131A priority Critical patent/RU2629290C1/en
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Publication of RU2629290C1 publication Critical patent/RU2629290C1/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12Methods or apparatus for controlling the flow of the obtained fluid to or in wells

Abstract

FIELD: oil and gas industry.
SUBSTANCE: method of well operation by installing electric centrifugal pump includes putting the well into operation, producing well product, shutting down, restarting the plant that includes air-tight screwed tubing strings, a motor, an electric centrifugal pump that includes a body, a shaft, stages, a base and fishneck, a return valve installed air-tightly above the pump characterized in that in the lower part of the pump there is a pump shut-off device in the form of at least one valve comprising stationary body and dynamic bushing mounted on a shaft which is hermetically sealed, when the pump is shut-down, and during operation it opens and connects the lower part of the pump to the annular space. The shut-off valve module of the electric centrifugal pump for operating the wells includes a body, the end parts, a shaft, at least one valve that hydraulically connects the pump inlet and the annular space, and which consists of stationary mounted valve body and dynamic bushing mounted on the shaft. The electric centrifugal pump for the operation of wells, which body contains at least one valve in the lower part hydraulically connecting the pump inlet and the annular space, and which consists of valve body stationary mounted in the pump body and dynamic bushing mounted on the shaft.
EFFECT: increased effectiveness of proposed group of inventions.
5 cl, 6 dwg

Description

FIELD OF THE INVENTION

A group of inventions is disclosed which relates to petroleum engineering, namely to multi-stage submersible pumps for pumping formation fluid from wells and to methods of operating wells using such pumps.

State of the art

There is a known method of operating wells 2559999 C2 from 09/19/2014 by installing an electric centrifugal pump, which includes putting a well into operation, producing a well product, shutting down, restarting the installation, which includes hermetically screwed tubing of an electric centrifugal pump, an engine sealed above and without a pump valves. The disadvantage is that when the installation is stopped, the non-return valve installed above the pump is tightly closed, a tight area (essentially a bell) is formed inside the pump, connected to the reservoir fluid in the lower part through the openings of the base or inlet module. Through these openings, the pump can be filled with free gas, which will make restarting difficult or impossible.

The closest analogue to RU 12421602 C1 dated 06/20/2011 is a method of operating a well, which includes lowering tubing string, an electric centrifugal pump with an input module, an electric motor with hydraulic protection, a universal valve that performs the functions of a check and flush valve. The disadvantage is that when the installation is stopped, the non-return valve installed above the pump is tightly closed, a tight area is formed inside the pump, connected to the reservoir fluid in the lower part through the openings of the base or inlet module. In fact, a bell.

The disadvantage of the above solutions is that through these openings the pump can be filled with free gas, as a result of which restarting will be difficult or impossible.

At present, a gas shut-off device for a pump is not available in industrial products. For this reason, the closest analogue is the knockdown and flush valves described in the patents discussed above. Their disadvantage is that they cannot automatically open when the pump stops. Removing excess gas for these valves is a random, side function, which is performed only occasionally: 1) when the valve is knocked out (designed to drain fluid from tubing strings when the centrifugal submersible pump installation is lifted from the well) they are knocked down when the installation is lifted, or 2) when the flush valve it is used for the periodic washing of the lift of wells and when injecting inhibitors to combat scaling, corrosion in tubing, and when killing wells. Such devices cannot ensure tightness at the pump inlet.

A technical solution is required that, when the pump is stopped, can ensure the tightness of the gas-liquid mixture inside, in order to maintain the permissible free gas content until it is switched on again. This is important if the free gas content in the annulus at the time the unit is turned on is higher than the permissible value at which the pump can operate. During the operation of the submersible installation, the gas separator separates free gas, and a degassed mixture with an acceptable free gas content enters the pump. When stopped, the gas separator does not work, through the inlet openings of the gas separator, the pump is connected to the annulus and the free gas content inside the pump first becomes equal to the free gas content in the annulus, and then the gas begins to collect in the pump as in a glass with the bottom pointing up, which is installed in gas-liquid mixture.

The technical task of the invention is to increase the reliability of operation of wells with a high content of free gas by eliminating the likelihood that the content of free gas inside the pump when it stops will exceed the permissible value. The technical result is the solution of this problem, in particular, consisting of a sealed valve installed at the inlet to the pump, which can eliminate the hydraulic connection between the inside of the pump and the annulus, maintain pressure and, accordingly, the free gas content inside the pump, which was during operation of the gas separator. If the shut-off valve leak tightness, leakage should open the exhaust valve installed at the outlet of the pump. In this case, the pump will be similar to a glass with the bottom turned down, and will be filled with degassed liquid. The intake of degassed liquid from above should be higher than the leakage from the shutoff valve.

SUMMARY OF THE INVENTION

The technical problem is solved by the fact that a method of operating wells by installing an electric centrifugal pump is used, including putting a well into operation, producing a well product, shutting down, restarting the installation, which includes hermetically screwed tubing, an engine, an electric centrifugal pump, which includes a housing, a shaft, steps, base and fishing head, hermetically installed above the pump check and knock valves, while in accordance with the invention in the lower part on wasp pump installed locking device in the form of at least one valve, consisting of a stationary housing and dynamic sleeve mounted on a shaft, which during a stoppage of the pump tightly, and during operation of the pump is opened and connects the bottom part of the pump to the annulus.

For the purposes of this application, the concepts of “before” and “after” something are defined in the direction of fluid flow during pump operation.

Under the operation of the pump and the operating time of the pump refers to the state of the pump when its rotor rotates and the reservoir fluid is pumped.

The given set of actions leads to the achievement of a technical result and to efficient well operation by eliminating the possibility of collecting gas in the pump to a concentration at which its operation is impossible.

In addition, in the particular case of the invention, the shut-off device of the pump is made as a separate module of the shut-off valve, which is installed directly at the inlet to the pump.

In addition, in the particular case of the invention, a pump exhaust device is installed in the upper part of the pump and up to the non-return valve, which is hermetic during operation of the pump, and when the pump is stopped, opens and connects the upper part of the pump to the annulus.

The proposed method described above is implemented using the shutoff valve module of an electric centrifugal pump for well operation, which includes a housing, end parts, a shaft, at least one valve, hydraulically connecting the pump inlet and the annular space, which consists of a fixed valve body and a dynamic bushings mounted on the shaft.

The locking device installed in the lower part of the pump or in a separate module must be open during operation of the pump and connect the lower part of the pump to the annulus, and is tightly closed during shutdown. This allows you to save the acceptable gas content for the pump.

If the gas shut-off device of the pump is manufactured in a separate module, for example, in the input module, this allows you to save unification.

Also, structurally, a valve can be installed in the lower part of the pump casing that hydraulically connects the pump inlet and the annulus, which consists of a valve casing mounted motionlessly in the pump casing and a dynamic sleeve mounted on the shaft.

This reduces the cost of the product.

Under the lower part of the pump for the purposes of this application refers to the part of the pump located below the stage (s) of a centrifugal borehole pump.

For the purposes of this application, the phrases “shut-off pump module” and “inlet module with shut-off valve” are understood to be equivalent.

The design of the device leads to the achievement of a technical result and to efficient operation of the well by eliminating the likelihood of gas collection inside the pump with the formation of an air plug.

An additional technical result of the implementation of the shut-off valve in a separate pump module is the possibility of supplying already launched pumps with an additional section of such a module, which, accordingly, does not require replacement of the entire pump or its lower part.

A brief description of the graphic materials that explain the invention

In FIG. 1 schematically shows the layout of downhole equipment for implementing the proposed method of operating wells.

In FIG. 2 - pump shutoff valve installed in the inlet module in the closed position.

In FIG. 3 - pump shutoff valve installed in the inlet module, in the open position.

In FIG. 4 - pump shutoff valve installed at the pump inlet in the closed position.

In FIG. 5 - shut-off valve installed at the inlet to the pump, in the open position.

In FIG. 6 - section of the exhaust gas valve of the pump.

Installation of an electric centrifugal pump includes hermetically screwed tubing (not shown), an engine, a gas separator (not shown), an electric centrifugal pump 1.

The pump includes a housing 2, a shaft 3, a stage 4, a base 5, which may have inlet openings 6, a head 7, a non-return valve 8, which is sealed above the pump.

In the upper part of the pump, up to the check valve, a gas exhaust device is installed, which during operation of the pump is hermetic, opens during the stop and connects the upper part of the pump to the annulus.

Structurally, the pump exhaust device can be made in the pump head or as a separate module of the exhaust valve 9, which is installed directly above the fishing head 7 of the upper section of the pump.

The gas exhaust valve module of the pump 8 includes a module housing 10, a normally open non-return valve 11 installed inside the housing, hydraulically connecting the internal area of the installation 12 and the annulus, the filters 13 and 14 are installed at the inlet and outlet of it.

The shut-off valve consists of a valve body 15, which can be made in the form of a wheel support or a guide apparatus, and a dynamic sleeve 16 mounted on the shaft 17. On the dynamic sleeve 16, support washers 18 are installed, which can be made of composite material or elastomer. A seal 19 can be installed between the hub of the dynamic sleeve and the shaft. An upper support plate 20 or an axial support with carbide washers are installed in the upper part of the dynamic sleeve. The axial force directed upwards can be perceived by short keys mounted on the shaft, in this case the keyway in the impeller hub must not be through, see Fig. 3.

The dynamic sleeve 16 may have a blade ring 21 at the periphery, and a screw groove 22 may be cut on the inside of the valve body 15.

Structurally, the shutoff valve can be installed at the inlet to the pump or in a separate module.

The installation itself, used in this way and having the named design features, works as follows. When the engine rotates the shaft 3 of a submersible multistage centrifugal pump 1, the working fluid with a reduced free gas content due to the operation of the gas separator flows through the inlet holes 6, base 5.

It passes through the steps 4 installed in the housing 2, while the pressure rises. The free gas that is present in the formation fluid dissolves. When the pump 1 is operating, the check valve 11 installed in the housing 9 is closed, the check valve 8 is open. The dynamic sleeves 16 are raised and installed in the upper position due to the dynamic pressure of the fluid flow, see FIG. 3 and 5.

The shoulder blade 21 and the helical groove 22 are dispersed, the gas-liquid mixture is ground, due to this, the permissible free gas content at the inlet to the pump increases.

When the pump 1 stops, the check valve 8 is hermetically closed, a column of formation fluid from the tubing presses on it. Inside the pump, a sealed area is formed, in fact, a bell (the glass is turned bottom-down), connected to the formation fluid in the lower part through the openings 6 of the base 5, the input module or the gas separator. After stopping the pump 1, the pressure in the inner region 12 decreases, gas is released. The gas-liquid mixture tries to enter the annulus through the holes 5, passing through the dynamic bushings 16, acts on them with a dynamic pressure and sets them in the lower position, see Fig. 2 and 4. The supporting washers 18 play the role of mechanical seals, the rings 19 are radial. The shutoff valve closes and maintains a high pressure inside the pump. The free gas content remains acceptable for restarting the pump. If it is not possible to ensure complete tightness, for example, the seals 19 are worn out, mechanical impurities passing through narrow channels clog them and reduce leakage.

If the engine stops for a long time, the pressure inside the pump due to leaks can equal the pressure in the annulus. In this case, the vent valve 5 opens. The width of the channels in it is greater than in the shut-off valve. And the pump is likened to a glass installed in the gas-liquid mixture upside down. Gradually, the pump fills with a degassed liquid. This allows you to successfully bring the pump to operating mode. After the installation is turned on, the pressure in the pump rises, the gas exhaust valve 11 closes, the shut-off valve opens, and pump 1 starts to operate normally.

Using the proposed method of operating wells and a device for its implementation will ensure the reliability of operation and the life of the installation.

Claims (5)

1. A method of operating wells by installing an electric centrifugal pump, which includes putting a well into operation, producing a well product, shutting down, restarting an installation that includes hermetically screwed tubing, an engine, an electric centrifugal pump that includes a housing, shaft, steps, base and fishing a check valve hermetically mounted above the pump, characterized in that at the bottom of the pump there is a shut-off device of the pump in the form of at least one valve, consisting it from the stationary housing and the dynamic sleeve mounted on a shaft, which during a stoppage of the pump tightly, and during operation of the pump is opened and connects the bottom part of the pump to the annulus.
2. The method of operating wells by installing an electric centrifugal pump according to claim 1, characterized in that the shut-off device of the pump is made in the form of a separate shut-off valve module, which is installed at the pump inlet.
3. The method of operating wells by installing an electric centrifugal pump according to claim 1, characterized in that a pump exhaust device is installed in the upper part of the pump to the non-return valve, which is sealed while the pump is in operation and opens and connects the upper part of the pump to the annulus during shutdown .
4. The shutoff valve module of the electric centrifugal pump for well operation, including a housing, end parts, a shaft, at least one valve, hydraulically connecting the pump inlet and the annular space, which consists of a fixed valve body and a dynamic sleeve mounted on the shaft .
5. An electric centrifugal pump for operating wells, the housing of which contains at least one valve in the lower part that hydraulically connects the pump inlet and the annulus, which consists of a valve housing mounted motionlessly in the pump housing and a dynamic sleeve mounted on the shaft.
RU2016125131A 2016-06-23 2016-06-23 Method of well operation (versions) and devices for its implementation RU2629290C1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2733345C1 (en) * 2020-04-14 2020-10-01 Общество С Ограниченной Ответственностью "Оклэс Технолоджиз" Downhole device for gas discharge

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2054916A (en) * 1933-12-11 1936-09-22 James W Taylor Automatic control valve
RU97778U1 (en) * 2010-04-19 2010-09-20 Общество с ограниченной ответственностью ООО "ТехНО-Ойл" Submersible centrifugal pump input module
RU2421602C1 (en) * 2010-02-09 2011-06-20 Александр Владимирович Яшин Procedure for well operation
RU105938U1 (en) * 2011-02-11 2011-06-27 Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий-Газпром ВНИИГАЗ" Device for fluid pumping into a well
RU2480630C1 (en) * 2011-09-29 2013-04-27 Общество с ограниченной ответственностью "Русская электротехническая компания" ("РУСЭЛКОМ") Bypass valve for submersible centrifugal electric pump
RU2544930C1 (en) * 2013-09-17 2015-03-20 Мурад Давлетович Валеев Return valve of electric centrifugal unit and cleaning method of filter at pump suction
RU2559999C2 (en) * 2014-09-19 2015-08-20 Олег Сергеевич Николаев Well development and operation method and configuration of downhole equipment for its implementation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2054916A (en) * 1933-12-11 1936-09-22 James W Taylor Automatic control valve
RU2421602C1 (en) * 2010-02-09 2011-06-20 Александр Владимирович Яшин Procedure for well operation
RU97778U1 (en) * 2010-04-19 2010-09-20 Общество с ограниченной ответственностью ООО "ТехНО-Ойл" Submersible centrifugal pump input module
RU105938U1 (en) * 2011-02-11 2011-06-27 Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий-Газпром ВНИИГАЗ" Device for fluid pumping into a well
RU2480630C1 (en) * 2011-09-29 2013-04-27 Общество с ограниченной ответственностью "Русская электротехническая компания" ("РУСЭЛКОМ") Bypass valve for submersible centrifugal electric pump
RU2544930C1 (en) * 2013-09-17 2015-03-20 Мурад Давлетович Валеев Return valve of electric centrifugal unit and cleaning method of filter at pump suction
RU2559999C2 (en) * 2014-09-19 2015-08-20 Олег Сергеевич Николаев Well development and operation method and configuration of downhole equipment for its implementation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2733345C1 (en) * 2020-04-14 2020-10-01 Общество С Ограниченной Ответственностью "Оклэс Технолоджиз" Downhole device for gas discharge

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