RU2408779C1 - Well filter - Google Patents

Well filter Download PDF

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Publication number
RU2408779C1
RU2408779C1 RU2009131791/03A RU2009131791A RU2408779C1 RU 2408779 C1 RU2408779 C1 RU 2408779C1 RU 2009131791/03 A RU2009131791/03 A RU 2009131791/03A RU 2009131791 A RU2009131791 A RU 2009131791A RU 2408779 C1 RU2408779 C1 RU 2408779C1
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RU
Russia
Prior art keywords
pipe
filter
valve
sleeve
downhole
Prior art date
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RU2009131791/03A
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Russian (ru)
Inventor
Владимир Александрович Чигряй (RU)
Владимир Александрович Чигряй
Анатолий Михайлович Пашков (RU)
Анатолий Михайлович Пашков
Original Assignee
Владимир Александрович Чигряй
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Application filed by Владимир Александрович Чигряй filed Critical Владимир Александрович Чигряй
Priority to RU2009131791/03A priority Critical patent/RU2408779C1/en
Application granted granted Critical
Publication of RU2408779C1 publication Critical patent/RU2408779C1/en

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Abstract

FIELD: oil and gas production.
SUBSTANCE: well filter corresponds to filter block consisting of two concentric pipes, of filter element, of plugged impurities accumulator and of valve. At its lower an external pipe has an adapting support coupling, into a through thread orifice of which there is installed the impurities accumulator. Tangentially arranged input slit orifices are made in the external pipe. A coupling-adaptor is installed on an upper end of the external pipe into the threaded orifice. Also, a wire screen is installed into a circular gap between the internal and external pipes; the screen is secured on a lower part of the external pipe by means of uniformly arranged pins positioned on both sides of the wire at different vertical level so, that the low end of the wire screen is located below a valve.
EFFECT: raised reliability of filter operation; reduced prime cost of repair and preventing works for replacement and restoration of filter.
6 cl, 7 dwg

Description

The invention relates to the mining industry, in particular to oil and gas, and can be used in the development and operation of oil and water wells as part of downhole equipment, for filtering well fluid from mechanical impurities (sand, sludge).

A known filter containing a perforated pipe and a filtering metal mesh covering the outer surface of the perforated pipe, and made of two main parts: filter and connecting, which are fixed to each other using a sleeve, according to the invention, the filtering part is a perforated pipe with slotted holes, the connecting part also a perforated pipe with holes, a sleeve with a threaded connection is welded to the pipe body of the connecting part for installation and rubber O-rings. In the filter, a woven metal mesh is installed in several layers. The filter is equipped with an additional filtering part to increase the throughput for high-yield wells (RF patent No. 2302514, IPC ЕВВ 43/08, publ. 2007.07.10).

The disadvantage of this filter is the low self-cleaning effect, which negatively affects the reliability and durability of the downhole filter, increases the cost.

A known filter consisting of concentrically located outer, intermediate and inner pipes, the latter is equipped with holes, and a sub, while the inner pipe is equipped with a filter mesh located inside it, made in the form of a screw and attached opposite the holes located along a helical line, in addition, the outer and the inner pipes in the upper part are interconnected by tangential pipes, and the inner and intermediate pipes in the lower part are also connected by tangential pipes, but oppositely oriented, while the annular gap between the intermediate and inner pipes in the upper part, as well as the upper and lower parts of the inner pipe are equipped with plugs, the outer pipe in the upper part is equipped with elastic rings, and in the lower part with a plug (RF patent No. 2158358, IPC E21B 43/08, publ. 2000.10.27).

However, this filter has a complex structure, which complicates its assembly and operation. In case of clogging of the filter element, the liquid supply to the pump stops, there is a need to replace the filter associated with stopping the pump

A well-known well filter, consisting of concentrically located outer, intermediate and inner pipes, the last two provided with holes and in the upper part are connected by a pipe, the outer pipe is connected to the intermediate pipe by annular plugs, the inner pipe is equipped with a filter element placed in the interval of holes made on this pipe, the same pipe is equipped with a bell and connected to it by longitudinal ribs, while the bell is located with a gap relative about the intermediate pipe and is equipped with a nozzle in the lower part, in the annular gap between the inner and intermediate pipes, a filter element is arranged coaxially with them, made in the form of a reverse truncated cone and attached to these pipes above the upper holes made in them, while the middle holes of the intermediate pipe made opposite the bell and equipped with a filter element, the bell is also equipped with a centralizer (RF patent No. 2305756, IPC EV 43/08, publ. 2007.09.10).

The disadvantage of this filter is the abrasive wear and destruction of the filter mesh due to its blockage and slow cleaning of mechanical impurities, as well as a low separation coefficient of mechanical impurities.

A well-known well filter, including a metal pipe with holes, provided with a plug at the bottom, placed inside the metal pipe with a gap and a filter element coaxial with it, is characterized in that the filter element is made in the form of a cylindrical pipe, the alignment of the filter element is provided by centralizers, the metal pipe is equipped with a sleeve on top in which a spring-loaded valve is installed, while in the coupling there are longitudinal through holes and a hydraulic channel consisting of two halves, the first half on the channel, equipped with a valve ball, coincides with the axis of the downhole filter, and the second half is perpendicular to it and does not cross the longitudinal through holes, and in the lower part of the metal pipe there is a hole above the plug (RF patent No. 2355876, IPC ЕВВ 43/08, published 05/20/2009).

The closest analogue of the proposed invention is a filter containing a perforated pipe with a sleeve and a filtering metal mesh covering the outer surface of the perforated pipe, in which several filter elements are installed along the length of the perforated pipe, which represent a metal mesh fixed in the frame and installed in centralizers, inside a perforated pipe has a receiving pipe, the lower end of which is made with a bevel and is located below the filter elements, and the upper Netz goes into the clutch. On the lower end of the receiving pipe, holes are made on the perforated pipe, which are closed by a split ring (patent for a utility model of the Russian Federation No. 75215, IPC ЕВВ 43/08, publ. 2008.07.27).

The disadvantage of these filters is the low self-cleaning effect of the puttyed filter holes.

The objective of the invention is to increase the reliability of the filter by extending the period of effective filtration and removal of mechanical impurities without killing the well.

The technical result achieved by using the present invention is to increase the reliability of the downhole filter and reduce the cost of repair and maintenance work on replacing and restoring the downhole filter.

This problem is solved in that in the downhole filter, which is a filter unit consisting of two concentrically arranged pipes, containing a filter element, an impurity accumulator ending in a plug, a valve, an outer pipe contains a transitional support sleeve at the lower end, in which a threaded through hole is installed impurity accumulator, tangentially located inlet slots are made in the outer pipe, a transition coupling is installed in the threaded hole at the upper end of the outer pipe k, while in the annular gap between the inner pipe and the outer pipe there is a mesh screen mounted on the bottom of the outer pipe with uniformly spaced pins installed on both sides of the mesh screen at different vertical levels so that the lower end of the mesh screen is below the valve.

In addition, the inner conical surface of the support sleeve is a guide for sludge.

In addition, a pipe is installed in the upper part of the adapter sleeve, connected by a sleeve sleeve to a sealing device that separates clean and dirty areas of the working medium.

In addition, the downhole filter can be frame-shaped, while the filtering element is a cylindrical slotted grate made in the form of a spiral from a high-precision profile of a triangular shape, fixed by welding to supporting elements mounted on an inner pipe, at the lower end of which a valve is installed .

In addition, the downhole filter can be made frameless, while the filtering element in the form of a slotted grating made in the form of a spiral from a high-precision profile of a triangular shape is fixed by welding to supporting elements installed in the grooves of the inner pipe, and the valve is installed in a housing attached to the lower end of the inner pipe.

The invention is illustrated by drawings.

Figure 1 - General view of the downhole filter, frame option.

Figure 2 - General view of the downhole filter, frameless version.

Figure 3 is a General view of the downhole filter with a mesh screen.

Figure 4 - section aa, tangential slit-like openings.

Figure 5 - view B, the mounting of the filter element.

6 is a view, the mount frameless filter.

7 is a view of D, the mounting of the mesh screen.

The downhole filter is a filter block consisting of two concentrically arranged pipes. The outer pipe 1 of the filter contains at the lower end of the adapter supporting sleeve 2 with a through threaded hole into which an impurity storage device 3 is inserted, ending in a streamlined plug 4. The volume and dimensions of the drive are determined by the concentration of mechanical impurities and the operating time of the pump unit.

The lower end surface 5 of the support sleeve 2 is designed to support the downhole filter, for the passage of fluid from the lower casing 6 to the upper casing 7, holes are made in the support sleeve 2, the inner conical surface 8 of the sleeve 2 is a guide for sediment. In the outer pipe 1, there are tangentially located inlet slots 9 creating a twisting of the incoming stream, while the cross-sectional area of the holes and their sizes are selected depending on the performance of the pump unit.

Above the tangentially located inlet slit openings 9, an internal thread is made on the upper end of the outer pipe, an adapter sleeve 10 is mounted on the thread, the inner pipe 11 is installed coaxially with the outer pipe 1 in the lower internal threaded hole of the pipe.

In the upper part of the adapter sleeve 10, a pipe 12 is mounted on the thread, connected by a sleeve sleeve 13 to a sealing device 14, which separates the clean and dirty areas of the working medium.

The downhole filter can be made in various versions - frame, frameless, as well as mesh, slotted.

In an embodiment of the frame filter, the filter element 15 is a cylindrical slotted grid made in the form of a spiral from a high-precision profile of a triangular shape, fixed by welding to supporting elements 16 mounted on the inner pipe 11 (Fig. 5). At the lower end of the inner pipe 11, a valve 17 is installed (Fig. 1), the design of which is determined by the working environment and the performance of the pump unit.

In the installation option of the frameless filter, the filter element 15 in the form of a slit lattice made in the form of a spiral from a high-precision profile of a triangular shape is fixed by welding on the supporting elements 18 installed in the grooves of the inner pipe 11 (Fig.6), while the valve 17 is installed in a housing 19 attached to the lower end of the inner pipe 11 (FIG. 2).

Additionally, a mesh screen 20 can be installed in the annular gap between the inner pipe 11 and the outer pipe 1, which allows separating the mechanical impurities from the suction surface of the filter, which are discarded by centrifugal force on the periphery of the flow, fixed on the lower part of the outer pipe 1 with uniformly located pins 21, installed on both sides of the mesh screen at different levels vertically, so that the lower end of the mesh screen is located below the valve 17.

The principle of operation of the downhole filter is as follows.

The formation fluid located in the well inside the lower casing 6 is driven by the action of the pump and reservoir pressure, while flowing around the impurity accumulator 3 with plug 4 passes through the holes located in the adapter sleeve 2 into the upper casing 7, and it is sucked into the filter unit through the tangentially located slotted openings 9 of the outer pipe 1, thereby forming a vortex, the velocity field of which is determined by the capacity and size of the slits. At the same time, mechanical particles having a higher density than liquid are discarded by centrifugal forces to the periphery of the inner wall of the outer pipe 1.

Mechanical particles, discarded by centrifugal forces to the inner wall of the outer pipe, continue to move downward, as the vortex flow velocity decays, they begin to settle, when using the mesh screen 20, the separation effect is significantly enhanced, while the inner conical surface 8 of the coupling 2 is a guide for sediment and impurities settle in the accumulator of impurities 3. Further movement of the crude liquid along the upper casing 7 is impeded by a sealing device 14, which separates a clean and dirty region Part of the work environment.

A partially purified liquid, with an already insignificant concentration of particles through the filter element 15, is sucked into the pipe 11. Passing through the filter element, the liquid is cleaned of any mechanical impurities remaining in the liquid. Then, the purified liquid rises up the pipe 11 and enters a clean area bounded by a sealing device 14, from which the pumping unit located above pumps the filtered liquid upward.

The valve 17 is designed for an emergency in case of clogging of the filter element 15. In a situation where the slit lattice of the filter element is clogged with impurities, the pressure inside the inner pipe 11 and the filter element drops. Under the action of the created pressure differential, the valve 17 opens and the liquid, falling from the inner space of the outer pipe 1 into the inner cavity of the filter element, equalizes the pressure, thereby creating favorable conditions for cleaning the filter element from impurities pressed before that by the pressure difference. The filter unit resumes operation.

A feature of this filter is the use of the water hammer effect to clean the filtering surface of the filter element from the sludge layer to restore its efficiency, which ensures a high self-cleaning effect of the filter, excluding lifting the filter to the surface for regeneration or replacement. The proposed technical solutions provide a more efficient operation of the downhole pumping unit when lifting highly viscous oil, reduce the cost of additional flushing and equipment repair.

Claims (5)

1. A downhole filter, which is a filter unit consisting of two concentrically arranged pipes, containing a filter element, an impurity accumulator ending with a plug, a valve, characterized in that the outer pipe contains a transitional supporting sleeve at the lower end, into which a drive is installed through the threaded hole impurities, tangentially located inlet slots are made in the outer pipe, an adapter sleeve is installed in the threaded hole at the upper end of the outer pipe, while a mesh screen is installed in the annular gap between the inner pipe and the outer pipe, fixed to the bottom of the outer pipe with pins that are evenly spaced, installed on both sides of the mesh screen at a different vertical level, so that the lower end of the mesh screen is located below the valve.
2. The downhole filter according to claim 1, characterized in that the inner conical surface of the support sleeve is a guide for sediment.
3. The downhole filter according to claim 1, characterized in that a pipe is connected to the upper part of the adapter sleeve by means of a sleeve sleeve with a sealing device that separates clean and dirty areas of the working medium.
4. The downhole filter according to claim 1, characterized in that it is frame-shaped, wherein the filtering element is a cylindrical slotted grate made in the form of a spiral from a high-precision triangular profile, fixed by welding to support elements mounted on the inner pipe , at the lower end of which a valve is installed.
5. The downhole filter according to claim 1, characterized in that it is made frameless, while the filter element in the form of a slit lattice made in the form of a spiral from a high-precision profile of a triangular shape, is fixed by welding to supporting elements installed in the grooves of the inner pipe, and the valve is mounted in a housing attached to the lower end of the inner pipe.
RU2009131791/03A 2009-08-21 2009-08-21 Well filter RU2408779C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2009131791/03A RU2408779C1 (en) 2009-08-21 2009-08-21 Well filter

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RU2009131791/03A RU2408779C1 (en) 2009-08-21 2009-08-21 Well filter

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2492314C1 (en) * 2012-05-10 2013-09-10 Олег Савельевич Кочетов Screened pipe
RU2514057C1 (en) * 2012-12-06 2014-04-27 ООО "РН-УфаНИПИнефть" Well screen
RU2590924C1 (en) * 2015-08-28 2016-07-10 Публичное акционерное общество "Татнефть" им. В.Д. Шашина Well fluid cleaning filter
RU2602625C1 (en) * 2015-09-30 2016-11-20 Акционерное общество "Новомет-Пермь" Downhole filtering device
RU181492U1 (en) * 2017-11-21 2018-07-17 ПАО "Татнефть" имени В.Д. Шашина Device to prevent sand from entering the pump intake
RU182632U1 (en) * 2018-06-13 2018-08-24 Общество с ограниченной ответственностью "Опытно-конструкторское производство" (ООО "ОКП") Hydrodynamic filter
RU2718445C1 (en) * 2019-12-02 2020-04-06 Общество С Ограниченной Ответственностью «Технопаритет» Gravity-inertia filter for installation of electrically driven centrifugal pump
RU200894U1 (en) * 2019-12-27 2020-11-17 Александр Васильевич Николаев CENTRIFUGAL-GRAVITATION GAS-SESSION FILTER

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2492314C1 (en) * 2012-05-10 2013-09-10 Олег Савельевич Кочетов Screened pipe
RU2514057C1 (en) * 2012-12-06 2014-04-27 ООО "РН-УфаНИПИнефть" Well screen
RU2590924C1 (en) * 2015-08-28 2016-07-10 Публичное акционерное общество "Татнефть" им. В.Д. Шашина Well fluid cleaning filter
RU2602625C1 (en) * 2015-09-30 2016-11-20 Акционерное общество "Новомет-Пермь" Downhole filtering device
RU181492U1 (en) * 2017-11-21 2018-07-17 ПАО "Татнефть" имени В.Д. Шашина Device to prevent sand from entering the pump intake
RU182632U1 (en) * 2018-06-13 2018-08-24 Общество с ограниченной ответственностью "Опытно-конструкторское производство" (ООО "ОКП") Hydrodynamic filter
RU2718445C1 (en) * 2019-12-02 2020-04-06 Общество С Ограниченной Ответственностью «Технопаритет» Gravity-inertia filter for installation of electrically driven centrifugal pump
RU200894U1 (en) * 2019-12-27 2020-11-17 Александр Васильевич Николаев CENTRIFUGAL-GRAVITATION GAS-SESSION FILTER

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