RU2393332C1 - Well jet plant for cleaning of bottom holes from sand plugs in conditions of abnormal low formation pressures - Google Patents

Well jet plant for cleaning of bottom holes from sand plugs in conditions of abnormal low formation pressures Download PDF

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Publication number
RU2393332C1
RU2393332C1 RU2009119598/03A RU2009119598A RU2393332C1 RU 2393332 C1 RU2393332 C1 RU 2393332C1 RU 2009119598/03 A RU2009119598/03 A RU 2009119598/03A RU 2009119598 A RU2009119598 A RU 2009119598A RU 2393332 C1 RU2393332 C1 RU 2393332C1
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RU
Russia
Prior art keywords
nozzle
channel
axial channel
working medium
housing
Prior art date
Application number
RU2009119598/03A
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Russian (ru)
Inventor
Борис Анатольевич Дудниченко (UA)
Борис Анатольевич ДУДНИЧЕНКО
Александр Мирославович Карасевич (RU)
Александр Мирославович Карасевич
Николай Миронович Сторонский (RU)
Николай Миронович Сторонский
Зиновий Дмитриевич Хоминец (UA)
Зиновий Дмитриевич Хоминец
Original Assignee
Борис Анатольевич ДУДНИЧЕНКО
Александр Мирославович Карасевич
Николай Миронович Сторонский
Зиновий Дмитриевич Хоминец
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Борис Анатольевич ДУДНИЧЕНКО, Александр Мирославович Карасевич, Николай Миронович Сторонский, Зиновий Дмитриевич Хоминец filed Critical Борис Анатольевич ДУДНИЧЕНКО
Priority to RU2009119598/03A priority Critical patent/RU2393332C1/en
Application granted granted Critical
Publication of RU2393332C1 publication Critical patent/RU2393332C1/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
    • E21B37/00Methods or apparatus for cleaning boreholes or wells

Abstract

FIELD: oil and gas industry.
SUBSTANCE: device includes ejector pump installed on flexible flow column and including the housing in which there installed coaxially to flexible flow column is nozzle and mixing chamber with duffuser, as well as there is axial channel and transverse working medium supply channel interconnected with it and made below the nozzle. Parallel to axial channel there is supply channel of the medium pumped from the well. On the upper end side the axial channel is interconnected with the nozzle, and on lower end side it is interconnected with multi-nozzle atomiser installed under the housing and provided with possibility of being rotated under influence of the leaving working medium about the axial channel axis. Below transverse channel, on external side surface of the housing there installed is seal made from elastic material, e.g. from rubber, and consisting of not less than two sealing cups separated with metal gaskets.
EFFECT: simplifying the device design, reducing the manufacturing costs of the proposed invention, improving the operating reliability of the device and efficiency of the carried out works on destruction of sand plugs.
2 cl, 1 dwg

Description

The invention relates to the field of pumping technology, mainly to downhole jet installations for well development.

A well-known inkjet apparatus for washing wells, comprising a housing associated with a pipe string, a packer cuff located in its lower part and a piston interacting with it, hydraulically connected to an active medium supply channel, a jet pump installed in the upper part of the housing above the cuff, including a jet pump connected to a supply channel active medium nozzle, diffuser with an outlet in the above-packer space, a mixing chamber connected to the sub-packer zone by a passive medium supply channel, and formed in the central housing the cavity and the annular channel for supplying the active medium coaxial with the latter and the piston, connected with it (see patent RU 2139422, 10.10.1999).

However, the implementation of an inkjet apparatus with a piston and an annular channel for supplying an active medium to the piston coaxial to the central cavity complicates the design of the device, which in some cases leads to difficulties in placing such an installation in the well and reducing the reliability of its operation.

The closest to the invention in technical essence and the achieved result is a downhole jet installation comprising a jet pump, a separation unit, including a nozzle coaxially mounted in the housing to form a suction annular channel, upper and lower packing elements and a sand plug destruction unit, while the jet pump located above the separation unit, each packer element consists of a distribution sleeve with a seat in the upper part, while the jet pump and the separation unit have a common vacuum suction line formed by the suction jet pump annular cavity, the annular cavity, the radial holes, the suction ring channel and radial holes sloping downwards relative to the axis of the device node separation.

This installation allows you to clean the well from sand plugs and sludge, however, the design of this installation has a lot of mobile spring-loaded elements, which in the conditions of the installation in the well when pumping liquid media mixed with sand leads to a decrease in the reliability of the installation.

The problem to which the present invention is directed, is to simplify the design of the installation.

The technical result consists in increasing the efficiency of the work on the destruction of sand plugs and improving the reliability of the jet pump.

This problem is solved, and the technical result is achieved due to the fact that the well jet unit for cleaning the bottom of wells from sand plugs contains an ejector pump mounted on a flexible column of tubing (CT), including a housing in which the coiled tubing, nozzle and chamber are installed mixing with a diffuser, and also made the axial channel and the transverse channel for supplying the working medium connected with it, made below the nozzle, and parallel to the axial channel is made the channel for supplying the medium pumped out of the well s, from the upper end side the axial channel is in communication with the nozzle, and from the lower end side the axial channel is in communication with the multi-nozzle nozzle installed under the body, with the possibility of rotation under the action of the expiring working medium around the axis of the axial channel, below the transverse channel on the outer side surface of the body a sealant made of an elastic material, for example rubber, consisting of at least two sealing cuffs separated by metal gaskets.

The diameter of the nozzles of the multi-nozzle nozzle is preferably designed to supply from them 10 to 20% of the working medium supplied to the installation through the transverse channel for supplying the working medium, and the ejector pump is preferably designed for an ejection coefficient of at least 0.20. The analysis of the work on the destruction of sand plugs in the well showed that cleaning the bottom of the wells from sand plugs is an important problem in the repair and development of wells. Cork formation mainly occurs during the operation of wells, the reservoirs of which are poorly cemented sandstones. Sand is removed from the formation into the wellbore as a result of the destruction of rocks under the influence of pressure and filtration pressure of formation fluids. Sand entering the well, settling on the bottom, forms a cork, which leads to a decrease in the flow rate of the well and intensive wear of production equipment.

Cork removal is a time-consuming repair operation associated with loss of production from the well.

Described in the invention downhole jet installation for cleaning the bottom of wells from sand plugs allows the destruction of sand plugs and flushing the well without creating back pressure on the reservoir. The destruction of the sand plug is achieved by the simultaneous impact of a fluid flow from the nozzles of the rotating multi-nozzle nozzle on it and the creation of a low pressure zone by the jet installation at the erosion site of the sand plug, which allows working at low reservoir pressures without contaminating the borehole zone of the formation with the working medium. Thus, the task of the invention was solved - increasing the efficiency of ongoing work on the destruction of sand plugs in wells.

In the course of the research, the best combination of nozzle and ejector pump operation was achieved with nozzle nozzle diameters designed to supply from 10 to 20% of the working medium supplied to the unit through the transverse medium supply channel, while the ejector pump was not designed for the ejection coefficient below 0.20.

The drawing schematically shows a longitudinal section of a downhole jet unit.

A downhole jet installation for cleaning bottom holes from sand plugs contains 1 ejector pump 2 installed on a flexible string of tubing (2), including a housing 3, in which a nozzle 4 and a mixing chamber 5 with a diffuser 6 are installed coaxially with the tubing, and are also made the axial channel 7 and the transverse channel 8 for supplying the working medium connected with it, made below the nozzle 4. Parallel to the axial channel 7, a channel 9 for supplying the medium pumped out of the well is made, and from the upper end side the axial channel 7 is in communication with the nozzle 4, and with a hundred the lower end of the axial channel 7 is in communication with the multi-nozzle nozzle 10, which is installed under the housing 3, rotatably under the action of the expiring working medium around the axis of the axial channel 7, below the transverse channel 8, on the outer side surface of the housing 3, a sealant 11 made of elastic material, for example rubber, consisting of at least two sealing cuffs 12, separated by metal gaskets 13.

The diameter of the nozzles of the nozzles 10 is designed to supply from them 10 to 20% of the working medium supplied to the installation through the transverse channel 8 for supplying the working medium, and the ejector pump 2 is designed for an ejection coefficient of at least 0.20.

The method of operation of a downhole jet installation for cleaning bottom holes from sand plugs is as follows.

At CT 1, the ejector pump 2 with a multi-nozzle nozzle 10 is installed in the well with a string of tubing (tubing) installed in it 14 to break the sand plug. When the nozzle 10 reaches the surface of the sand plug 15 in the annular space 16 between the CT 1 and the tubing 14, a working medium is supplied under pressure. Under the action of the working medium, the cuffs 12 of the seal 11 open up, preventing the movement of the working medium towards the bottom of the well, and it enters the transverse channel 8 for supplying the working medium, and from it into the axial channel 7. At the same time, most of the working medium passes through the axial channel 7 to nozzle 4, flowing out of which carries liquid medium with sand from under housing 3, and a smaller part of the working medium passes through channel 7 to nozzles 17 of the multi-nozzle nozzle 10 and, flowing out of nozzles 17 at high speed, erodes the sand plug 15. From the ejector pump 2 mix work whose medium and sand by CT 1 is fed to the surface. Gradually, as the sand plug is eroded, the downhole jet unit is lowered to the bottom of the well with the working ejector pump 2 and nozzle 10. In this case, the cuffs 12 of the seal 11 slide along the inner walls of the tubing 14, acting as a packer.

The present invention can be used in the oil and gas industry when carrying out work on the repair and development of wells.

Claims (2)

1. A downhole jet installation for cleaning bottom holes from sand plugs, comprising an ejector pump mounted on a flexible string of tubing (CT), including a housing in which a nozzle and a mixing chamber with a diffuser are installed coaxially with the CT, and the axial channel and with it, a transverse channel for supplying a working medium below the nozzle, and parallel to the axial channel, a channel for supplying a medium pumped out of the well is made, from the upper end side the axial channel is in communication with the nozzle, and from the lower side the end of the axial channel is communicated with a multi-nozzle nozzle mounted under the housing with the possibility of rotation under the action of the expiring working medium around the axis of the axial channel, a seal from elastic material, for example, rubber, consisting of at least two sealing lips, is installed on the outer side surface of the housing separated by metal gaskets.
2. The installation according to claim 1, characterized in that the diameter of the nozzles of the multi-nozzle nozzle is designed to supply from them 10 to 20% of the working medium supplied to the installation through the transverse channel for supplying the working medium, and the ejector pump is designed for an ejection coefficient of at least 0, twenty.
RU2009119598/03A 2009-05-26 2009-05-26 Well jet plant for cleaning of bottom holes from sand plugs in conditions of abnormal low formation pressures RU2393332C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2009119598/03A RU2393332C1 (en) 2009-05-26 2009-05-26 Well jet plant for cleaning of bottom holes from sand plugs in conditions of abnormal low formation pressures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2009119598/03A RU2393332C1 (en) 2009-05-26 2009-05-26 Well jet plant for cleaning of bottom holes from sand plugs in conditions of abnormal low formation pressures
PCT/RU2010/000200 WO2010138020A1 (en) 2009-05-26 2010-04-26 Well jet device for removing sand plugs from bottom holes in the conditions of abnormally low formation pressures

Publications (1)

Publication Number Publication Date
RU2393332C1 true RU2393332C1 (en) 2010-06-27

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RU2009119598/03A RU2393332C1 (en) 2009-05-26 2009-05-26 Well jet plant for cleaning of bottom holes from sand plugs in conditions of abnormal low formation pressures

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WO (1) WO2010138020A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2561220C1 (en) * 2014-02-07 2015-08-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный технологический университет" (ФГБОУ ВПО "КубГТУ") Well flushing-out jet unit
RU2563896C1 (en) * 2014-10-10 2015-09-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный технологический университет" (ФГБОУ ВПО "КубГТУ") Submersible ejector unit to clean well bottomhole of sand plugs under abnormally low formation pressure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201010192D0 (en) 2010-06-17 2010-07-21 Servwell Engineering Ltd Downhole mixing tool

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1081334A1 (en) * 1983-02-21 1984-03-23 Charyev Marat O Arrangement for flushing sand plugs
US6173771B1 (en) * 1998-07-29 2001-01-16 Schlumberger Technology Corporation Apparatus for cleaning well tubular members
US7273108B2 (en) * 2004-04-01 2007-09-25 Bj Services Company Apparatus to allow a coiled tubing tractor to traverse a horizontal wellbore
RU2314411C1 (en) * 2006-08-25 2008-01-10 Открытое акционерное общество "Газпром" Pump-vacuum device for well cleaning of sand plug

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2561220C1 (en) * 2014-02-07 2015-08-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный технологический университет" (ФГБОУ ВПО "КубГТУ") Well flushing-out jet unit
RU2563896C1 (en) * 2014-10-10 2015-09-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный технологический университет" (ФГБОУ ВПО "КубГТУ") Submersible ejector unit to clean well bottomhole of sand plugs under abnormally low formation pressure

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MM4A The patent is invalid due to non-payment of fees

Effective date: 20180527