WO2008058540A1 - Fluid cleaner - Google Patents

Fluid cleaner Download PDF

Info

Publication number
WO2008058540A1
WO2008058540A1 PCT/DK2007/000502 DK2007000502W WO2008058540A1 WO 2008058540 A1 WO2008058540 A1 WO 2008058540A1 DK 2007000502 W DK2007000502 W DK 2007000502W WO 2008058540 A1 WO2008058540 A1 WO 2008058540A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
chamber
filter
cleaner tool
well
Prior art date
Application number
PCT/DK2007/000502
Other languages
French (fr)
Inventor
Jørgen HALLUNDBAEK
Original Assignee
Welltec A/S
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.)
Filing date
Publication date
Application filed by Welltec A/S filed Critical Welltec A/S
Publication of WO2008058540A1 publication Critical patent/WO2008058540A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
    • E21B27/005—Collecting means with a strainer
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/35—Arrangements for separating materials produced by the well specially adapted for separating solids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/38—Arrangements for separating materials produced by the well in the well

Definitions

  • the present invention relates to a fluid cleaner tool for removal of elements, such as sand and debris, from fluid such as oil in a well downhole.
  • the oil When pumping oil fluid up from reservoirs downhole, the oil may contain some other elements.
  • the oil fluid may be filled with elements such as sand, debris, piping dope, remains from a previous explosion, rust from the casing in the well or detachments torn off from the well, the casing or the formation.
  • elements such as sand, debris, etc. may be deposited at locations in the well and the well may be partly or wholly filled with such elements.
  • the depositing of such elements results in an increasingly lower flow rate of oil, and a need for draining the well from sand, debris, etc. arises.
  • US 2004/0177951 A1 discloses a very complex nozzle and ven- turi system driven by a power fluid of water, foam or gas.
  • the power fluid is not present downhole and must be brought down from above implying additional equipment both above and downhole.
  • fluid is drawn through a filter placed across the path of the fluid, whereby the separated sand accumulates before the filter 220 and the subsequent fluid has to penetrate both the previously separated sand and the filter in order to be separated from the sand, making the process still more energy consuming over time.
  • filtration systems use an ejector in connection with a feed pump where the feed pump delivers power fluid to the ejector for pumping the oil fluid up through the well.
  • the power fluid is made by filtrating fluid from the well in the feed pump. If the fluid is not sufficiently filtrated, parts of the feed pump will be subjected to greater wear than if the filter is more small-meshed. However, the filtration in the feed pump reduces the efficiency substantially.
  • An aspect of the present invention is, at least partly, to overcome the disadvantages of the systems mentioned above and to provide a fluid cleaner tool which is simple in construction and which may function without the addition of a power fluid which is not at hand in an oil well.
  • a fluid cleaner tool for removal of elements, such as sand and debris, from fluid such as oil in a well downhole where the tool is connected to an electrical conducting means, such as a wireline.
  • the fluid cleaner tool comprises a chamber having a fil- ter within the chamber for separation of the elements from the fluid, and an inlet with at least one one-way valve, adapted so as to open to let fluid into the chamber and close to prevent the same fluid from flowing out of the inlet in the chamber.
  • the fluid cleaner tool comprises a centrifugal pump for pumping the fluid into the chamber and through the filter, the filter being an elongated filter extending in the chamber hav- ing a length L.
  • the use of such an elongated filter has proven to make the fluid cleaner tool particularly effective.
  • the chamber is completely filled with the removed elements and the filter is completely covered from the front end to the back end.
  • the filtered fluid is re- turned to the front end of the fluid cleaner tool, and thus becomes still cleaner while at the same time the stream of filtered fluid is helping to remove the heaps of elements collected in the front end of the fluid cleaner tool.
  • the tool may comprise a motor for driving the pump.
  • the one-way valve of the tool may have at least one flap which opens to let fluid into the chamber and closes to prevent the same fluid from flowing out of the inlet in the chamber.
  • the flap may be fastened to the chamber in a centre section positioned in a centre of an end of the chamber comprising the inlet.
  • the one-way valve may have three flaps.
  • the filter may have a length that is at least half the length of the chamber L.
  • the fluid cleaner tool may comprise outlets in connections with the centrifugal pump so that the pump pumps the fluid radially out through the outlets.
  • the chamber may have a round cross-section shape in its end comprising the inlet with the one-way valve.
  • the invention relates to a fluid cleaner system for removal of elements, such as sand and debris, from fluid in a well downhole, comprising a fluid cleaner tool according to the invention, and a driving unit such as a downhole tractor for moving the fluid cleaner tool in the well.
  • Fig. 1 shows a fluid cleaner tool according to the invention
  • Fig. 2 shows an embodiment of the tool
  • Fig. 3 shows another embodiment of the tool
  • Fig. 4 shows yet another embodiment of the tool
  • Fig. 5 shows the tool of Fig. 4 in a well
  • Fig. 6 shows yet another embodiment of the tool filled with sand
  • Fig. 7 shows the tool of Fig. 6 in a well in which the sand has been moved
  • Fig. 8 shows an embodiment of the one-way valve in the tool
  • Fig. 9 shows another embodiment of the one-way valve in the tool.
  • fluid cleaner tool 1 comprising a chamber 4 into which fluid such as oil fluid flows.
  • fluid such as oil fluid flows.
  • the flow of the fluid is illustrated by arrows.
  • a filter 5 for filtrating elements from the fluid is situated inside the chamber, allowing the fluid to flow through the filter while the elements are sifted out by the filter.
  • the separated elements may be any kinds of sand, debris, piping dope, remains from a previous explosion, rust from the casing in the well or detachments torn off from the well, the casing 2 or the formation.
  • the tool 1 is connected to a wireline 3 which again is connected to a power supply situated on e.g. an oil rig.
  • a power supply situated on e.g. an oil rig.
  • an inlet 6 is situated in the chamber 4.
  • the inlet 6 is provided with a one-way valve 7 opening to let fluid into the chamber and closing to prevent the same fluid from flowing out through the inlet of the chamber.
  • the one-way valve 7 comprises a flap 10 which is adapt- ed to open for letting fluid into the chamber and close for preventing the same fluid from flowing out of the inlet 6 in the chamber 4.
  • the filter 5 is designed as an elongated member and arranged to extend along the longitudinal central axis of the chamber.
  • the filter is constructed by a supporting frame (not shown) which is covered by a filter cloth (shown schematically in the drawing).
  • the filter may be supported by an encircling ring 15 and radially extending legs 16, 17 (shown by the broken line in Fig. 1 ).
  • the filter is closed and rounded at the front end, which is closest to the one-way valve.
  • the sand and debris which have been separated from the fluid by the filter are then collected by the chamber by being placed in the cav- ity between the filter and the inside of the chamber.
  • the fluid which has passed the fil- ter is let out through outlets 11 so that the fluid when passing the filter re-enters the well again.
  • the tool comprises a centrifugal pump 8 driven by a motor 9.
  • a centrifugal pump 8 driven by a motor 9.
  • the outlets 11 are positioned in connection with the centrifugal pump so that the pump has an axial intake of fluid and radial outputs 11.
  • the motor 9 may, in one embodiment, be a one-step centrifugal pump and, in another embodiment, a multi-step centrifugal pump.
  • the chamber has a length L which is the distance from the inlet of the chamber to the end of the filter where the filter is connected to the chamber.
  • the length of the filter is half the length L of the chamber.
  • the extension length of the filter is 2/3 of the length L of the chamber.
  • the inlet of the chamber is shown having a round cross-section shape at the forward end.
  • the rounded shape makes the fluid cleaner tool better suited for sucking up sand from the bottom of a horizontal well as shown in Fig. 4 while at the same time being suited for sucking up sand from the bottom of a vertical well.
  • the tool is shown submerged into a vertical well section bending into a horizontal well section.
  • the rounded inlet is also very suitable for sucking up sand deposited in the section of the well where the vertical well continues into a horizontal well.
  • the one-way valve has one flap and, in another embodiment, it has two flaps.
  • the tool is seen from the end of the chamber where the oneway valve is positioned.
  • the embodiment of the valve shown in Fig. 8 has three flaps and the embodiment of the valve shown in Fig. 9 has four flaps.
  • One end of each flap is fastened to the tool at the centre of the tool in a centre section 13 and the other end of each flap abuts against the periphery of the tool when the valve is closed.
  • the flaps move inwardly towards the centre axis of the tool. In this way all flaps move to open or close the valve and thus a valve with two or more flaps has a shorter reaction time than a valve with one flap.
  • the one-way valve may be a ball valve, where the valve is opened and closed by a ball, or any other kind of one-way valve.
  • a ball valve more valves may be incorporated in the tool in order to increase the inlet opening area and thereby increasing the volume flow.
  • ball valves have to be situated in the same plane orthogonal to the longitudinal axis of the tool in order for the pump to suck the valves open.
  • the sand When elements, such as sand, have been separated from the oil fluid, the sand will initially be deposited in a pile 12 as shown in Fig. 6. However, the oil fluid will also flow around the pile of elements 12 and thus move the elements towards the pump as shown in Fig. 7, thus distributing the elements more evenly along the length of the filter. In this way, almost the entire capacity of the chamber is used, filling the chamber perfectly with sand or other elements while the front of the filter is kept free of sand. The sand will not block the filter before the chamber is almost filled with sand and the chamber must be emptied anyway.
  • the tool may be provided with an inflow channel 14 (Fig. 2) for guiding the flow from the filter into the pump.
  • a downhole tractor can be used to draw or push the pump system all the way into posi- tion in the well.
  • a downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®, sold by the applicant.
  • the fluid is for illustrative purposes described as an oil fluid containing other elements such as sand, debris, piping dope, remains from a previous explosion, rust from the casing in the well or detachments tom-off from the well, the casing or the formation.
  • the fluid may be any kind of downhole fluid such as mix of oil with water, gas or the like.

Abstract

The invention relates to a fluid cleaner tool (1 ) for removal of elements such as sand and debris from fluid such as oil in a well (2) downhole, where the tool is connected to an electrical conducting means, such as a wireline (3). The fluid cleaner tool may further comprise a chamber (4) having a filter (5) within the chamber for separation of the elements from the fluid and an inlet (6) with at least one one-way valve (7).

Description

Title: Fluid Cleaner
Technical Field
The present invention relates to a fluid cleaner tool for removal of elements, such as sand and debris, from fluid such as oil in a well downhole.
Background Art
When pumping oil fluid up from reservoirs downhole, the oil may contain some other elements. The oil fluid may be filled with elements such as sand, debris, piping dope, remains from a previous explosion, rust from the casing in the well or detachments torn off from the well, the casing or the formation.
Known solutions to filtrate the sand and debris from the oil fluid are normally performed above water level. However, filtration may also be performed subsurface since too much sand and debris in the oil fluid decrease the flow rate of the oil and the rate may end up so low that some filtration is needed downhole in order to lift oil up from the well.
After some time, elements such as sand, debris, etc. may be deposited at locations in the well and the well may be partly or wholly filled with such elements. The depositing of such elements results in an increasingly lower flow rate of oil, and a need for draining the well from sand, debris, etc. arises.
Solutions for filtrating elements such as sand and debris from the oil are known from US 2004/0177951 A1. US 2004/0177951 A1 discloses a very complex nozzle and ven- turi system driven by a power fluid of water, foam or gas. The power fluid is not present downhole and must be brought down from above implying additional equipment both above and downhole. Furthermore, fluid is drawn through a filter placed across the path of the fluid, whereby the separated sand accumulates before the filter 220 and the subsequent fluid has to penetrate both the previously separated sand and the filter in order to be separated from the sand, making the process still more energy consuming over time. Other filtration systems use an ejector in connection with a feed pump where the feed pump delivers power fluid to the ejector for pumping the oil fluid up through the well. However, such a system is very energy consuming and therefore not very efficient. Furthermore, the power fluid is made by filtrating fluid from the well in the feed pump. If the fluid is not sufficiently filtrated, parts of the feed pump will be subjected to greater wear than if the filter is more small-meshed. However, the filtration in the feed pump reduces the efficiency substantially.
Description of Invention
An aspect of the present invention is, at least partly, to overcome the disadvantages of the systems mentioned above and to provide a fluid cleaner tool which is simple in construction and which may function without the addition of a power fluid which is not at hand in an oil well.
This aspect and the advantages becoming evident from the description below are obtained by a fluid cleaner tool for removal of elements, such as sand and debris, from fluid such as oil in a well downhole where the tool is connected to an electrical conducting means, such as a wireline. The fluid cleaner tool comprises a chamber having a fil- ter within the chamber for separation of the elements from the fluid, and an inlet with at least one one-way valve, adapted so as to open to let fluid into the chamber and close to prevent the same fluid from flowing out of the inlet in the chamber. Moreover, the fluid cleaner tool comprises a centrifugal pump for pumping the fluid into the chamber and through the filter, the filter being an elongated filter extending in the chamber hav- ing a length L.
The use of such an elongated filter has proven to make the fluid cleaner tool particularly effective. The chamber is completely filled with the removed elements and the filter is completely covered from the front end to the back end. The filtered fluid is re- turned to the front end of the fluid cleaner tool, and thus becomes still cleaner while at the same time the stream of filtered fluid is helping to remove the heaps of elements collected in the front end of the fluid cleaner tool.
In one embodiment of the invention, the tool may comprise a motor for driving the pump. In another embodiment, the one-way valve of the tool may have at least one flap which opens to let fluid into the chamber and closes to prevent the same fluid from flowing out of the inlet in the chamber.
Furthermore, the flap may be fastened to the chamber in a centre section positioned in a centre of an end of the chamber comprising the inlet.
According to the invention, the one-way valve may have three flaps.
In addition, the filter may have a length that is at least half the length of the chamber L.
Also, the fluid cleaner tool may comprise outlets in connections with the centrifugal pump so that the pump pumps the fluid radially out through the outlets.
In yet another embodiment, the chamber may have a round cross-section shape in its end comprising the inlet with the one-way valve.
Furthermore, the invention relates to a fluid cleaner system for removal of elements, such as sand and debris, from fluid in a well downhole, comprising a fluid cleaner tool according to the invention, and a driving unit such as a downhole tractor for moving the fluid cleaner tool in the well.
Brief Description of the Drawings
The invention is explained in detail below with reference to the drawing, in which schematic views of the invention is shown and in which, in more detail,
Fig. 1 shows a fluid cleaner tool according to the invention,
Fig. 2 shows an embodiment of the tool,
Fig. 3 shows another embodiment of the tool,
Fig. 4 shows yet another embodiment of the tool,
Fig. 5 shows the tool of Fig. 4 in a well, Fig. 6 shows yet another embodiment of the tool filled with sand,
Fig. 7 shows the tool of Fig. 6 in a well in which the sand has been moved,
Fig. 8 shows an embodiment of the one-way valve in the tool, and
Fig. 9 shows another embodiment of the one-way valve in the tool.
Detailed description of the invention
In Fig. 1 a, fluid cleaner tool 1 according to the invention is shown, comprising a chamber 4 into which fluid such as oil fluid flows. In the drawing, the flow of the fluid is illustrated by arrows. Inside the chamber, a filter 5 for filtrating elements from the fluid is situated allowing the fluid to flow through the filter while the elements are sifted out by the filter. The separated elements may be any kinds of sand, debris, piping dope, remains from a previous explosion, rust from the casing in the well or detachments torn off from the well, the casing 2 or the formation.
In one end, the tool 1 is connected to a wireline 3 which again is connected to a power supply situated on e.g. an oil rig. In the other end of the tool, an inlet 6 is situated in the chamber 4. The inlet 6 is provided with a one-way valve 7 opening to let fluid into the chamber and closing to prevent the same fluid from flowing out through the inlet of the chamber. In this embodiment, the one-way valve 7 comprises a flap 10 which is adapt- ed to open for letting fluid into the chamber and close for preventing the same fluid from flowing out of the inlet 6 in the chamber 4.
The filter 5 is designed as an elongated member and arranged to extend along the longitudinal central axis of the chamber. The filter is constructed by a supporting frame (not shown) which is covered by a filter cloth (shown schematically in the drawing). The filter may be supported by an encircling ring 15 and radially extending legs 16, 17 (shown by the broken line in Fig. 1 ). The filter is closed and rounded at the front end, which is closest to the one-way valve. The sand and debris which have been separated from the fluid by the filter are then collected by the chamber by being placed in the cav- ity between the filter and the inside of the chamber. The fluid which has passed the fil- ter is let out through outlets 11 so that the fluid when passing the filter re-enters the well again.
Furthermore, the tool comprises a centrifugal pump 8 driven by a motor 9. In this way, the fluid is sucked into the inlet of the chamber and through the filter. The outlets 11 are positioned in connection with the centrifugal pump so that the pump has an axial intake of fluid and radial outputs 11. The motor 9 may, in one embodiment, be a one-step centrifugal pump and, in another embodiment, a multi-step centrifugal pump.
As can be seen from Figs. 2 and 3, the chamber has a length L which is the distance from the inlet of the chamber to the end of the filter where the filter is connected to the chamber. In one embodiment, the length of the filter is half the length L of the chamber. In another embodiment, the extension length of the filter is 2/3 of the length L of the chamber.
In Figs. 4 and 5, the inlet of the chamber is shown having a round cross-section shape at the forward end. The rounded shape makes the fluid cleaner tool better suited for sucking up sand from the bottom of a horizontal well as shown in Fig. 4 while at the same time being suited for sucking up sand from the bottom of a vertical well. In Fig. 5 the tool is shown submerged into a vertical well section bending into a horizontal well section. As can be seen from Fig. 5, the rounded inlet is also very suitable for sucking up sand deposited in the section of the well where the vertical well continues into a horizontal well.
In one embodiment, the one-way valve has one flap and, in another embodiment, it has two flaps. In Figs. 8 and 9, the tool is seen from the end of the chamber where the oneway valve is positioned. The embodiment of the valve shown in Fig. 8 has three flaps and the embodiment of the valve shown in Fig. 9 has four flaps. One end of each flap is fastened to the tool at the centre of the tool in a centre section 13 and the other end of each flap abuts against the periphery of the tool when the valve is closed. When the valve opens, the flaps move inwardly towards the centre axis of the tool. In this way all flaps move to open or close the valve and thus a valve with two or more flaps has a shorter reaction time than a valve with one flap.
In another embodiment, the one-way valve may be a ball valve, where the valve is opened and closed by a ball, or any other kind of one-way valve. In case of a ball valve, more valves may be incorporated in the tool in order to increase the inlet opening area and thereby increasing the volume flow. However, ball valves have to be situated in the same plane orthogonal to the longitudinal axis of the tool in order for the pump to suck the valves open.
When elements, such as sand, have been separated from the oil fluid, the sand will initially be deposited in a pile 12 as shown in Fig. 6. However, the oil fluid will also flow around the pile of elements 12 and thus move the elements towards the pump as shown in Fig. 7, thus distributing the elements more evenly along the length of the filter. In this way, almost the entire capacity of the chamber is used, filling the chamber perfectly with sand or other elements while the front of the filter is kept free of sand. The sand will not block the filter before the chamber is almost filled with sand and the chamber must be emptied anyway.
Furthermore, the tool may be provided with an inflow channel 14 (Fig. 2) for guiding the flow from the filter into the pump.
In the event that the fluid cleaner tool is not submergible all the way into the casing, a downhole tractor can be used to draw or push the pump system all the way into posi- tion in the well. A downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®, sold by the applicant.
The fluid is for illustrative purposes described as an oil fluid containing other elements such as sand, debris, piping dope, remains from a previous explosion, rust from the casing in the well or detachments tom-off from the well, the casing or the formation. However, within the scope of the invention, the fluid may be any kind of downhole fluid such as mix of oil with water, gas or the like.

Claims

Claims
1. Fluid cleaner tool (1 ) for removal of elements, such as sand and debris, from fluid such as oil in a well (2) downhole where the tool is connected to an electrical conduct- ing means, such as a wireline (3), said fluid cleaner tool comprising
- a chamber (4) having
- a filter (5) within the chamber for separation of the elements from the fluid, and
- an inlet (6) with at least one one-way valve (7), adapted to open to let fluid into the chamber (4) and close to prevent the same fluid from flowing out of the inlet in the chamber, and
- a centrifugal pump (8) for pumping the fluid into the chamber and through the filter, wherein the filter is an elongated filter extending in the chamber having a length L.
2. Fluid cleaner tool according to claim 1 , further comprising a motor (9) for driving the pump.
3. Fluid cleaner tool according to claim 1 or 2, wherein the one-way valve (7) has at least one flap (10) which opens to let fluid into the chamber and closes to prevent the same fluid from flowing out of the inlet in the chamber.
4. Fluid cleaner tool according to any one of the preceding claims, wherein the flap is fastened to the chamber in a centre section (13) positioned in a centre of an end of the chamber comprising the inlet.
5. Fluid cleaner tool according to any one of the preceding claims, wherein the oneway valve has three flaps.
6. Fluid cleaner tool according to any one of the preceding claims, wherein the filter has a length that is at least half the length of the chamber L.
7. Fluid cleaner tool according to any one of the preceding claims, further comprising outlets (11 ) in connections with the centrifugal pump so that the pump pumps the fluid radially out through the outlets.
8. Fluid cleaner tool according to any one of the preceding claims, wherein the chamber has a round cross-section shape in its end comprising the inlet with the oneway valve.
9. Fluid cleaner system for removal of elements, such as sand and debris, from fluid in a well downhole, comprising
- a fluid cleaner tool according to any of the preceding claims, and
- a driving unit such as a downhole tractor for moving the fluid cleaner tool in the well.
PCT/DK2007/000502 2006-11-15 2007-11-15 Fluid cleaner WO2008058540A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200601491 2006-11-15
DKPA200601491 2006-11-15

Publications (1)

Publication Number Publication Date
WO2008058540A1 true WO2008058540A1 (en) 2008-05-22

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012015574A2 (en) * 2010-07-30 2012-02-02 National Oilwell Varco, L.P. Control system for mud cleaning apparatus
WO2018088910A1 (en) * 2016-11-11 2018-05-17 Altus Intervention (Technologies) As Downhole debris collecting device with a filter
WO2022125139A1 (en) * 2020-12-09 2022-06-16 Saudi Arabian Oil Company Downhole cleaning tools and methods for operating the same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308160A (en) * 1940-03-16 1943-01-12 Standard Oil Dev Co Sand filter for gas and oil wells
US3572431A (en) * 1969-09-08 1971-03-23 Donald P Hammon Fluid circulating and retrieving apparatus for oil wells
FR2382259A1 (en) * 1977-03-03 1978-09-29 Me Co Gruppi Perforazioni Borehole slurry cleaning tube - has impeller which sucks slurry through filter with cleaning brushes and upwards through centre
GB2331536A (en) * 1997-11-24 1999-05-26 Baker Hughes Inc Removing unwanted downhole material
US20030079876A1 (en) * 2001-10-30 2003-05-01 Underdown David R. Method and system for regeneration of a membrane used to separate fluids in a wellbore
US20040177951A1 (en) * 2000-03-27 2004-09-16 Weatherford/Lamb, Inc. Sand removal and device retrieval tool
WO2005033471A1 (en) * 2003-10-09 2005-04-14 Hpi As A feed pump for a sand removal apparatus in an underground well

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308160A (en) * 1940-03-16 1943-01-12 Standard Oil Dev Co Sand filter for gas and oil wells
US3572431A (en) * 1969-09-08 1971-03-23 Donald P Hammon Fluid circulating and retrieving apparatus for oil wells
FR2382259A1 (en) * 1977-03-03 1978-09-29 Me Co Gruppi Perforazioni Borehole slurry cleaning tube - has impeller which sucks slurry through filter with cleaning brushes and upwards through centre
GB2331536A (en) * 1997-11-24 1999-05-26 Baker Hughes Inc Removing unwanted downhole material
US20040177951A1 (en) * 2000-03-27 2004-09-16 Weatherford/Lamb, Inc. Sand removal and device retrieval tool
US20030079876A1 (en) * 2001-10-30 2003-05-01 Underdown David R. Method and system for regeneration of a membrane used to separate fluids in a wellbore
WO2005033471A1 (en) * 2003-10-09 2005-04-14 Hpi As A feed pump for a sand removal apparatus in an underground well

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012015574A2 (en) * 2010-07-30 2012-02-02 National Oilwell Varco, L.P. Control system for mud cleaning apparatus
WO2012015574A3 (en) * 2010-07-30 2012-04-19 National Oilwell Varco, L.P. Control system for mud cleaning apparatus
US8469116B2 (en) 2010-07-30 2013-06-25 National Oilwell Varco, L.P. Control system for mud cleaning apparatus
WO2018088910A1 (en) * 2016-11-11 2018-05-17 Altus Intervention (Technologies) As Downhole debris collecting device with a filter
GB2570591A (en) * 2016-11-11 2019-07-31 Altus Intervention Tech As Downhole debris collecting device with a filter
GB2570591B (en) * 2016-11-11 2021-07-21 Altus Intervention Tech As Downhole debris collecting device with a filter
US11236566B2 (en) 2016-11-11 2022-02-01 Altus Intervention (Technologies) As Downhole debris collecting device with a filter
WO2022125139A1 (en) * 2020-12-09 2022-06-16 Saudi Arabian Oil Company Downhole cleaning tools and methods for operating the same
US11549335B2 (en) 2020-12-09 2023-01-10 Saudi Arabian Oil Company Downhole cleaning tools and methods for operating the same

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