GB1568680A – Method for reclaiming cased wells
– Google Patents
GB1568680A – Method for reclaiming cased wells
– Google Patents
Method for reclaiming cased wells
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Publication number
GB1568680A
GB1568680A
GB4288176A
GB4288176A
GB1568680A
GB 1568680 A
GB1568680 A
GB 1568680A
GB 4288176 A
GB4288176 A
GB 4288176A
GB 4288176 A
GB4288176 A
GB 4288176A
GB 1568680 A
GB1568680 A
GB 1568680A
Authority
GB
United Kingdom
Prior art keywords
jet
blasting
ducts
jet nozzle
evacuation
Prior art date
1975-10-17
Legal status (The legal status 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 status listed.)
Expired
Application number
GB4288176A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NOCON KG
Original Assignee
NOCON KG
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.)
1975-10-17
Filing date
1976-10-15
Publication date
1980-06-04
1976-10-15
Application filed by NOCON KG
filed
Critical
NOCON KG
1980-06-04
Publication of GB1568680A
publication
Critical
patent/GB1568680A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
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Classifications
E—FIXED CONSTRUCTIONS
E03—WATER SUPPLY; SEWERAGE
E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
E03B3/08—Obtaining and confining water by means of wells
E03B3/15—Keeping wells in good condition, e.g. by cleaning, repairing, regenerating; Maintaining or enlarging the capacity of wells or water-bearing layers
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
E21B37/08—Methods or apparatus for cleaning boreholes or wells cleaning in situ of down-hole filters, screens, e.g. casing perforations, or gravel packs
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
E21B41/00—Equipment or details not covered by groups E21B15/00 – E21B40/00
E21B41/0078—Nozzles used in boreholes
Description
(54) METHOD FOR RECLAIMING CASED WELLS
(71) We, NocoN KG, a German
Company, of Peddenberger Str. 18, 4224
Hunxe 2, West Germany, do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a method of reclaiming cased wells.
It may often be observed in cased wells which are used for water supplies that the outflow volume of the well tends to drop after some period of use and eventually the well dries up altogether. This is due to the fact that slits in a filter pipe in the well casing through which water passes to enter the casing become congested with silt and a gravel filter layer outside the filter pipe becomes blinded by metallic ochreous accre tins.
Up to now, acidification, or acid-washing, has been the most frequently employed method of reclaiming such wells which are about to dry up, or have already done so.
For this purpose, large quantities of acids, chiefly hydrochloric acid, are poured into the inside of the filter pipe to dissolve the metallic ochreous accretions. However, it was found that, even though vast quanties of acid were used, these would only reach the edge of the accretions and incrustrations in the filter without significantly dissolving them. The use of such large amounts of acid also entailed a considerable risk of water pollution.
It has also been tried to wash the filter slits clear by spraying water under slight pressure against the interior walls through jet nozzles, but it was found again that only a small number of slits could be effectively cleared in this way.
An effective removal of the ochreous accretions or incrustations on the outer pipe walls could hitherto be achieved only by excavating the filter gravel and manual cleaning which involved a tremendous amount of time and expense.
It is an aim of this invention to provide a method and apparatus for reclaiming cased wells which allow substantially full well-output reclamation without using acids or digging up the filter gravel.
According to the present invention, there is provided a method of reclaiming a cased well comprising effecting an internal wash of a filter pipe having slits therein in the well using a revolving jet nozzle arrangement which causes at least one washing jet to penetrate from the inside of the pipe into the slits, and then breaking up and flushing out accretions and agglomerations in ballast around the filter by circular and vertical movements of a lance fitted with a blasting and evacuator jet nozzle device.
Preferably, the revolving jet nozzle arrangement comprises a body having a free end which has a hub fitted with jet arms extending outwardly at right angles therefrom, the body being provided with a ring for the adjustable mounting of hoops which form a sliding carriage or guide, one of the jet arms discharging in the plane of rotation of the jet arms whilst the other jet arms discharge at an angle above or below said plane.
Preferably also, the blasting and evacuator jet nozzle device comprises a body having at least one boring or blasting jet nozzle and at least one evacuation jet nozzle therein, the or each blasting jet nozzle comprises a duct in the body which is directed forwardly thereof and is inclined with respect to a longitudinal axis of the body, and the or each evacuation jet nozzle comprises a lateral duct which is directed rearwardly of the body and is inclined with respect to the longitudinal axis of the body.
In one embodiment, the body of the blasting and evacuator jet nozzle device is of circular cross-section having an acutely conical centre point at its forward end with a step or shoulder adjacent to the base cf said centre point from which the blasting jet duct or ducts extend(s) from a conical end face of a central bore in the body, said body having a tapered region following the shoulder, said body being provided in a generally cylindrical middle region thereof with a turned recess of substantially rectangular cross-sectional form whereof the sidewalls are inclined relative to the longitudinal axis of the body, and the evacuation jet duct(s) emerge(s) at that side wall of said recess which is directed towards the lance, said generally cylindrical middle region being connected via a tapered transitional zone with a threaded end portion for connection to the lance.
Conveniently, there are provided two blasting jet ducts and six evacuation jet ducts, the axes of the two blasting jet ducts being substantially aligned with the axes of two of the evacuation jet ducts and the diameter ratio of the blasting jet ducts and evacuation jet ducts being 4: 3.
In another embodiment, (a) the body of the blasting and evacuator jet device is mainly cylindrical with a forward end provided with a triangular point, (b) a jet mouth is let into each face of the triangular point, (c) three blasting jet ducts are provided, each blasting jet ducts opening into a respective one of the jet mouths via a wall of the latter which is inclined at an acute angle to a plane perpendicular to the longitudinal axis of the body, (d) a midregion of the body is generally cylindrical and has adjacent thereto a turned recess of obtuse-angled cross-sectional form, (e) the evacuation jet duct(s) emerge(s) onto a sidewall of the recess which is directed towards the lance, and (f) the turned recess is followed by a threaded end portion for having an external diameter which is less than that of the cylindrical mid-region.
In this latter embodiment, the evacuator jet ducts are preferably slightly inclined so as to be slanted with reference to a medial plane of the body passing therethrough. The efficiency and progress of the method can be constantly monitored by observation of the water which is continuously pumped out of the well.
The method of the invention is capable of achieving substantially full reclamaticn without having to accept any risk of pollution or contamination by harmful chemicals. By examining the water which is pumped out of the well it is also possible to discover the actual causes of the congestion and to take preventive action against premature recurrence of the blockage. The method of this invention and the use of the particularly advantageous, special apDaratus designed for this purpose, allow a quick and thorough reclamation of the cased well which may be back in use after only a very brief period of interruption.
The method according to this invention may also be employed in open country for dissolving ochreous stratifications.
In the accompanying drawings :
Figure 1 shows a revolving jet nozzle arrangement for use in a method according to the present invention,
Figure 2 shows a jet nozzle device for washing the ballast around the cased well filter pipe in the method according to the present invention, and
Figure 3 shows a different jet nozzle device for washing the ballast around the well filter pipe.
Referring now to Fig. 1, the revolving jet nozzle arrangement comprises a main jet nozzle body 1 having a free end provided with a hub portion 2 which carries the nozzle arms 3 extending outwardly at right angles therefrom. A ring 4 is fitted on the body 1 to provide an adjustable mounting for hoops 5 which form a sliding carriage or guide so as to allow sliding displacement of the body 1 in well filter pipes of different diameters.The mouth opening of one of the three right-angled jet arms 3 extends exactly in the plane of rotation of the arms so that the liquid jet emerges under high pressure tangentially from this opening in the plane of rotation whereas the other jet arms are slightly angled by a few degrees up and down relative to this plane of rotation with the overali result that all of the jets in combination are able to sweep an annular field of the desired width within the well filter pipe to penetrate from the inside to the pipe to every slit therein.
Figure 2 shows a blasting and evacuation jet nozzle device for a well-cleaning lance, in which a main jet nozzle body 11 of the device comprises a sharply conical centre point 12, followed by a level step or shoulder at its base from which emerge forwardly directed ducts 13 which are inclined to the longitudinal axis of the body 11. Next to this shoulder there is a tapered transitional region 14 leading into the otherwise generally cylindrical body 11. Ap proximately medially of its length this body 11 is provided with a turned recess of substantially rectangular cross-sectional form with its side walls angularly inclined relative to the longitudinal axis of the body 11 and obliquely rearwardly directed lateral ducts 16 emerge approximately at right angles at the sidewall of the recess which is directed towards the lance.
Whereas the obliquely forwardly directed ducts 13 issue from the substantially conical leading end of a central bore 15 in the jet nozzle body 11, the lateral ducts 16 join the central bore 15 from the side thereof.
In the illustrated example, there are provided two of the forwardly directed ducts 13 and six of the obliquely rearwardly directed ducts 16 (only two shown), and the two forwardly directed ducts 13 are aligned almost flush with two of the obliquely rearwardly directed ducts 16, the diameter ratio of forwardly directed ducts relative to rearwardly directed ducts corresponding to 4:3.
Next to the turned recess and a cylindrical body portion, followed by another tapered transition zone, the jet nozzle body is provided with an externally threaded end portion 17 whereby it is adapted to be detachably secured to a lance (not shown).
In another advantageously designed blasting and evacuation jet nozzle device, as shown in Figure 3, a jet nozzle body 31, which has a generally cylindrical middle portion, comprises a triangularly pointed frontal end portion with a jet mouth let into each of the faces 32 of the triangle at the point. End faces 34 of these jet mouths are slightly inclined with respect to a plane which is normal to the axis of the body 31, and ducts 33 extend from these end faces 34 to a central bore 35 in the body 31 to form obliquely forwardly directed boring or blasting jets.The cylindrical middle portion of the body 31 is provided with a turned recess of obtuse-angled cross-sectional form, with lateral ducts 36 emerging at the recess side wall which is directed towards the lance, approximately at right angles to said wall and at an acute angle relative to the axis of the body 31, to form transporter or evacuation jets, the recess being followed by a threaded rear end portion 37 for connection of the jet assembly to the lance, which threaded portion is of slightly smaller diameter than the cylindrical middle portion of the body 31.
The lateral ducts 36 which extend from the recess in the body 31 to the central bore may also be slightly inclined in the transverse direction so as to be twisted, or skewed with reference to a medial plane of the jet body passing therethrough.
It will be appreciated that whilst the blasting and evacuating jet nozzle devices described above are one-part jet nozzle devices, such jet nozzle devices may, of course, also be executed in multi-part design which would permit the realisation of various combination effects.
The co- and interaction of the water jets which are ejected from the various ducts, the forwardly directed jets, on slight rotation, apply a hydromechanical boring or blasting action, whilst the rearwardly directed jets produce vortex suction to ensure rapid evacuation of the material which has been detached by the blasting jets.
In use, a cased well is reclaimed by first effecting an internal wash of the filter pipe in the well using the washing device hereinbefore described with reference to Fig. 1 to penetrate from the inside of the pipe to every slit therein. Then, accretions and agglomerations in ballast around the filter pipe are broken up using the lance (with the jet nozzle device of Fig. 2 or 3 connected) by circular and vertical movements of the latter. The incrustations are flushed out by the rearwardly directed jets of the jet nozzle device.
WHAT WE CLAIM IS: – 1. A method of reclaiming a cased well comprising effecting an internal wash of a filter pipe having slits therein in the well using a revolving jet nozzle arrangement which causes at least one washing jet to penetrate from the inside of the pipe into the slits, and then breaking up and flushing out accretions and agglomerations in ballast around the filter by circular and vertical movements of a lance fitted with a blasting and evacuator jet nozzle device.
2. A method as claimed in claim 1, wherein the revolving jet nozzle arrangement comprises a body having a free end which has a hub fitted with jet arms extending outwardly at right angles therefrom, the body being provided with a ring for the adjustable mounting of hoops which form a sliding carriage or guide, one of the jet arms discharging in the plane of rotation of the jet arms whilst the other jet arms discharge at an angle above or below said plane.
3. A method as claimed in claim 1 or 2, wherein the blasting and evacuator jet nozzle device comprises a body having at least one boring or blasting jet nozzle and at least one evacuation jet nozzle therein, the or each blasting jet nozzle comprises a duct in the body which is directed forwardly thereof and is inclined with respect to a longitudinal axis of the body, and the or each evacuation jet nozzle comprises a lateral duct which is directed rearwardly of the body and is inclined with respect to the longitudinal axis of the body.
4. A method as claimed in claim 3, wherein the body of the blasting and evacuator jet nozzle device is of circular crosssection having an acutely conical centre point at its forward end with a step or shoulder adjacent to the base of said centre point from which the blasting jet duct or ducts extend(s) from a conical end face of a central bore in the body, said body having a tapered region following the shoulder, said body being provided in a generally cylindrical middle region thereof with a turned recess of substantially rectangular cross-sectional form whereof the sidewalls are inclined relative to the longitudinal axis of the body, and the evacuation jet duct(s) emerge(s) at that side wall of said recess which is directed towards the lance, said generally cylindrical middle region being connected via a tapered transitional zone with a threaded end portion for connection to the lance.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
**WARNING** start of CLMS field may overlap end of DESC **. of forwardly directed ducts relative to rearwardly directed ducts corresponding to 4:3. Next to the turned recess and a cylindrical body portion, followed by another tapered transition zone, the jet nozzle body is provided with an externally threaded end portion 17 whereby it is adapted to be detachably secured to a lance (not shown). In another advantageously designed blasting and evacuation jet nozzle device, as shown in Figure 3, a jet nozzle body 31, which has a generally cylindrical middle portion, comprises a triangularly pointed frontal end portion with a jet mouth let into each of the faces 32 of the triangle at the point. End faces 34 of these jet mouths are slightly inclined with respect to a plane which is normal to the axis of the body 31, and ducts 33 extend from these end faces 34 to a central bore 35 in the body 31 to form obliquely forwardly directed boring or blasting jets.The cylindrical middle portion of the body 31 is provided with a turned recess of obtuse-angled cross-sectional form, with lateral ducts 36 emerging at the recess side wall which is directed towards the lance, approximately at right angles to said wall and at an acute angle relative to the axis of the body 31, to form transporter or evacuation jets, the recess being followed by a threaded rear end portion 37 for connection of the jet assembly to the lance, which threaded portion is of slightly smaller diameter than the cylindrical middle portion of the body 31. The lateral ducts 36 which extend from the recess in the body 31 to the central bore may also be slightly inclined in the transverse direction so as to be twisted, or skewed with reference to a medial plane of the jet body passing therethrough. It will be appreciated that whilst the blasting and evacuating jet nozzle devices described above are one-part jet nozzle devices, such jet nozzle devices may, of course, also be executed in multi-part design which would permit the realisation of various combination effects. The co- and interaction of the water jets which are ejected from the various ducts, the forwardly directed jets, on slight rotation, apply a hydromechanical boring or blasting action, whilst the rearwardly directed jets produce vortex suction to ensure rapid evacuation of the material which has been detached by the blasting jets. In use, a cased well is reclaimed by first effecting an internal wash of the filter pipe in the well using the washing device hereinbefore described with reference to Fig. 1 to penetrate from the inside of the pipe to every slit therein. Then, accretions and agglomerations in ballast around the filter pipe are broken up using the lance (with the jet nozzle device of Fig. 2 or 3 connected) by circular and vertical movements of the latter. The incrustations are flushed out by the rearwardly directed jets of the jet nozzle device. WHAT WE CLAIM IS: –
1. A method of reclaiming a cased well comprising effecting an internal wash of a filter pipe having slits therein in the well using a revolving jet nozzle arrangement which causes at least one washing jet to penetrate from the inside of the pipe into the slits, and then breaking up and flushing out accretions and agglomerations in ballast around the filter by circular and vertical movements of a lance fitted with a blasting and evacuator jet nozzle device.
2. A method as claimed in claim 1, wherein the revolving jet nozzle arrangement comprises a body having a free end which has a hub fitted with jet arms extending outwardly at right angles therefrom, the body being provided with a ring for the adjustable mounting of hoops which form a sliding carriage or guide, one of the jet arms discharging in the plane of rotation of the jet arms whilst the other jet arms discharge at an angle above or below said plane.
3. A method as claimed in claim 1 or 2, wherein the blasting and evacuator jet nozzle device comprises a body having at least one boring or blasting jet nozzle and at least one evacuation jet nozzle therein, the or each blasting jet nozzle comprises a duct in the body which is directed forwardly thereof and is inclined with respect to a longitudinal axis of the body, and the or each evacuation jet nozzle comprises a lateral duct which is directed rearwardly of the body and is inclined with respect to the longitudinal axis of the body.
4. A method as claimed in claim 3, wherein the body of the blasting and evacuator jet nozzle device is of circular crosssection having an acutely conical centre point at its forward end with a step or shoulder adjacent to the base of said centre point from which the blasting jet duct or ducts extend(s) from a conical end face of a central bore in the body, said body having a tapered region following the shoulder, said body being provided in a generally cylindrical middle region thereof with a turned recess of substantially rectangular cross-sectional form whereof the sidewalls are inclined relative to the longitudinal axis of the body, and the evacuation jet duct(s) emerge(s) at that side wall of said recess which is directed towards the lance, said generally cylindrical middle region being connected via a tapered transitional zone with a threaded end portion for connection to the lance.
5. A method as claimed in claim 4,
wherein there are provided two blasting jet ducts and six evacuation jet ducts, the axes of the two blasting jet ducts being substantially aligned with the axes of two of the evacuation jet ducts and the diameter ratio of the blasting jet ducts and evacuation jet ducts being 4: 3.
6. A method as claimed in claim 3, wherein (a) the body of the blasting and evacuator jet device is mainly cylindrical with a forward end provided with a triangular point, (b) a jet mouth is let into each face of the triangular point, (c) three blasting jet ducts are provided, each blasting jet duct opening into a respective one of the jet mouths via a wall of the latter which is inclined at an acute angle to a plane perpendicular to the longitudinal axis of the body, (d) a mid-region of the body is generally cylindrical and has adjacent thereto a turned recess of obtuse-angled cross-sectional from, (e) the evacuation jet duct(s) emerge(s) onto a sidewall of the recess which is directed towards the lance, and (f) the turned recess is followed by a threaded end portion for connection to the lance, the threaded end portion having an external diameter which is less than that of the cylindrical mid-region.
7. A method as claimed in claim 6, wherein the evacuation jet ducts are slightly inclined so as to be slanted with reference to a medial plane of the body passing therethrough.
8. A method as claimed in claim 1, substantially as hereinbefore described with reference of Figs. 1 and 2 or Figs. 1 and 3 of the accompanying drawings.
GB4288176A
1975-10-17
1976-10-15
Method for reclaiming cased wells
Expired
GB1568680A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
DE19752546684
DE2546684C3
(en)
1975-10-17
1975-10-17
Method and device for regenerating wells
Publications (1)
Publication Number
Publication Date
GB1568680A
true
GB1568680A
(en)
1980-06-04
Family
ID=5959443
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4288176A
Expired
GB1568680A
(en)
1975-10-17
1976-10-15
Method for reclaiming cased wells
Country Status (7)
Country
Link
AT
(1)
AT344618B
(en)
BE
(1)
BE847394A
(en)
DD
(1)
DD127166A5
(en)
DE
(1)
DE2546684C3
(en)
FR
(1)
FR2328083A1
(en)
GB
(1)
GB1568680A
(en)
NL
(1)
NL7611401A
(en)
Cited By (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2228026A
(en)
*
1989-01-19
1990-08-15
Otis Eng Co
Apparatus and methods for cleaning a well.
GB2228029A
(en)
*
1989-02-09
1990-08-15
Baker Hughes Inc
Horizontal well turbulator and method.
GB2324818A
(en)
*
1997-05-02
1998-11-04
Sofitech Nv
Jetting tool for well cleaning
US9399230B2
(en)
2014-01-16
2016-07-26
Nlb Corp.
Rotating fluid nozzle for tube cleaning system
EP2540402A3
(en)
*
2008-07-16
2017-07-19
VLN Advanced Technologies Inc.
Method and apparatus for prepping surfaces with a high-frequency forced pulsed waterjet
IT201800008114A1
(en)
*
2018-08-17
2018-11-17
Enolandia Srl
PERFECTED LANCE FOR MANUAL PRESSURE WASHING OF THE INTERNAL WALLS OF NARROW-MOUTH CONTAINERS
Families Citing this family (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3141855C2
(en)
*
1980-11-25
1984-02-02
Woma-Apparatebau Wolfgang Maasberg & Co Gmbh, 4100 Duisburg
Hydraulic work tool
DE4016965A1
(en)
*
1990-05-25
1991-11-28
Ksk Guided Microtunneling Tech
Drilling head for tunnel boring – has central channel with nozzles directed to front and rear
DE9413991U1
(en)
*
1994-08-30
1994-11-03
Timmler Karl Ludwig
Well filter cleaner
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Publication number
Priority date
Publication date
Assignee
Title
DE633730C
(en)
*
1932-09-04
1936-08-05
Otto Laubner
Bell or ring filter for pipe wells
DE916636C
(en)
*
1952-09-27
1954-08-12
Otto Kriegbaum
Process for loosening soil and filter layers in order to increase their permeability
DE1051741B
(en)
*
1954-10-01
1959-02-26
Hans Kahle
Device for cleaning pipe well filters u. like
1975
1975-10-17
DE
DE19752546684
patent/DE2546684C3/en
not_active
Expired
1976
1976-10-15
DD
DD19529676A
patent/DD127166A5/xx
unknown
1976-10-15
GB
GB4288176A
patent/GB1568680A/en
not_active
Expired
1976-10-15
NL
NL7611401A
patent/NL7611401A/en
active
Search and Examination
1976-10-18
AT
AT774176A
patent/AT344618B/en
not_active
IP Right Cessation
1976-10-18
FR
FR7632147A
patent/FR2328083A1/en
active
Granted
1976-10-18
BE
BE171595A
patent/BE847394A/en
not_active
IP Right Cessation
Cited By (15)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2228026A
(en)
*
1989-01-19
1990-08-15
Otis Eng Co
Apparatus and methods for cleaning a well.
GB2256887A
(en)
*
1989-01-19
1992-12-23
Otis Eng Co
Well cleaning system
GB2256887B
(en)
*
1989-01-19
1993-03-17
Otis Eng Co
Well cleaning system
GB2228026B
(en)
*
1989-01-19
1993-03-17
Otis Eng Co
Apparatus and methods for cleaning a well
GB2228029A
(en)
*
1989-02-09
1990-08-15
Baker Hughes Inc
Horizontal well turbulator and method.
GB2228029B
(en)
*
1989-02-09
1993-01-27
Baker Hughes Inc
Horizontal well turbulizer and method
GB2324818A
(en)
*
1997-05-02
1998-11-04
Sofitech Nv
Jetting tool for well cleaning
GB2324818B
(en)
*
1997-05-02
1999-07-14
Sofitech Nv
Jetting tool for well cleaning
US6062311A
(en)
*
1997-05-02
2000-05-16
Schlumberger Technology Corporation
Jetting tool for well cleaning
EP2540402A3
(en)
*
2008-07-16
2017-07-19
VLN Advanced Technologies Inc.
Method and apparatus for prepping surfaces with a high-frequency forced pulsed waterjet
US9757756B2
(en)
2008-07-16
2017-09-12
Vln Advanced Technologies Inc.
Method and apparatus for prepping bores and curved inner surfaces with a rotating high-frequencey forced pulsed waterjet
US10189046B2
(en)
2008-07-16
2019-01-29
Vln Advanced Technologies Inc.
Method and apparatus for prepping bores and curved inner surfaces with a rotating high-frequency forced pulsed waterjet
US10532373B2
(en)
2008-07-16
2020-01-14
Vln Advanced Technologies Inc.
Method and apparatus for prepping bores and curved inner surfaces with a rotating high-frequency forced pulsed waterjet
US9399230B2
(en)
2014-01-16
2016-07-26
Nlb Corp.
Rotating fluid nozzle for tube cleaning system
IT201800008114A1
(en)
*
2018-08-17
2018-11-17
Enolandia Srl
PERFECTED LANCE FOR MANUAL PRESSURE WASHING OF THE INTERNAL WALLS OF NARROW-MOUTH CONTAINERS
Also Published As
Publication number
Publication date
FR2328083A1
(en)
1977-05-13
DE2546684B2
(en)
1978-08-24
FR2328083B1
(en)
1981-07-03
DE2546684C3
(en)
1979-08-23
DE2546684A1
(en)
1977-04-21
AT344618B
(en)
1978-08-10
BE847394A
(en)
1977-02-14
ATA774176A
(en)
1977-11-15
NL7611401A
(en)
1977-04-19
DD127166A5
(en)
1977-09-07
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Legal Events
Date
Code
Title
Description
1980-08-28
PS
Patent sealed
1983-08-17
732
Registration of transactions, instruments or events in the register (sect. 32/1977)
1989-06-07
PCNP
Patent ceased through non-payment of renewal fee
