WO1991014076A1 - Well clearing and cleaning device - Google Patents

Well clearing and cleaning device Download PDF

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Publication number
WO1991014076A1
WO1991014076A1 PCT/FR1991/000181 FR9100181W WO9114076A1 WO 1991014076 A1 WO1991014076 A1 WO 1991014076A1 FR 9100181 W FR9100181 W FR 9100181W WO 9114076 A1 WO9114076 A1 WO 9114076A1
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WO
WIPO (PCT)
Prior art keywords
tool
plug
cleaning
tool holder
openings
Prior art date
Application number
PCT/FR1991/000181
Other languages
French (fr)
Inventor
Pierre Ungemach
Roland Turon
Paul-Emmanuel Benoist
Original Assignee
Pierre Ungemach
Roland Turon
Benoist Paul Emmanuel
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 Pierre Ungemach, Roland Turon, Benoist Paul Emmanuel filed Critical Pierre Ungemach
Publication of WO1991014076A1 publication Critical patent/WO1991014076A1/en

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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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0078—Nozzles used in boreholes
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
    • E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems
    • E21B21/103—Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus
    • 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

Definitions

  • the present invention relates to a device making it possible to combine the cleaning / cleaning of wells affected with deposits and incrustations by lowering the tool in rotation and circulation, with, simultaneously, washing with a high pressure jet - commonly called "jetting" - for finishing the surface finish.
  • the invention is particularly applicable to the reconditioning of wells affected by problems of deposits / incrustations due to the physico-chemical characteristics of the captured fluid.
  • the mechanical curative means making it possible to reduce, failing to eradicate, these damages are the following:
  • Conventional packing with tool the wells are freed from their deposits by rotary descent and circulation of mud, from a conventional packing with tool and rods well known to specialists.
  • Dewaxing hedgehog consisting of a brush attached to a rod weighted by a load bar, all connected to a cable used for the descent and ascent of the assembly; the limits of this cleaning method are well known because of the very principle and the need to have sufficient artesianism to raise the deposits after detachment from the wall.
  • the device according to the invention combines the use of high pressure jet washing with that of a conventional packing.
  • This combination of cleaning potentials associated with each of these two means makes it possible to perform a preliminary cleaning of the walls of the well by lowering a rotating drilling tool and to perfect the cleaning during the ascent by washing with a high pressure jet. .
  • the device according to the invention allows this implementation - or its interruption at the desired time.
  • FIG. 1 representing a view in longitudinal section of the device object of the invention
  • FIG. 2 showing a view in longitudinal section of the device object of l invention, in an initial phase of use for opening the high-pressure jet application nozzles
  • FIG. 3 representing a view in longitudinal section of the device which is the subject of the invention in a final phase of use for opening the high pressure jet application nozzles
  • FIG. 4a represents in longitudinal section an advantageous variant of an embodiment of the device object of the invention, provided with a non-return valve, shown in the open position
  • FIG. 4b shows in longitudinal section the device shown in FIG. 4a, the non-return valve being shown in the closed position.
  • Figure 1 describes the main components of the lining during descent: the tool 1 connected to the tool holder 2 according to the invention;
  • this tool holder 2 is provided with two threads allowing connection to the drill rods 7 of the lining in the upper part and to the tool 1 in part lower;
  • - It includes orifices 5 connected to a central channel C calibrated by nozzles 11, located in the same plane perpendicular to the axis of the lining and placing the interior of the tool holder in communication with the well to be cleaned; in a common but nonlimiting mode of use, the tool holder 2 comprises four calibrated orifices 5; similarly, the usual, non-restrictive diameter of the nozzles is between 7/32 "and 14/32"; - A jacket 4 capable of sliding in the central channel C, blinds these orifices 5 by dynamic seals 3 and is held in this position (hute) by a shear pin 10;
  • FIG. 2 illustrates the installation of the plug 8, after launching inside the lining from the surface: - the only openings 9 offered for the passage of the mud through the plug 8 cause an overpressure causing the rupture of the shear pin 10; this overpressure pushes the plug 8 / jacket 4 assembly downward, as shown in FIG. 3, releasing the calibrated lateral orifices 5, thus allowing "jetting"; the openings 9 through the plug 8 make it possible to maintain circulation through the tool 1, thus avoiding any risk of jamming;
  • the plug 8 is provided with a fishing neck 12 allowing, where appropriate, its recovery by means of the "cleaning cable” which is fitted to each drilling rig; this operation completely restores circulation through the tool.
  • the device according to the invention can be adapted to all casings (7 "- 9 5/8" - 13 3/8 "), completions (5 1/2" - 5 3/4 "- 6") and exposed (6 "- 8 1/2" - 12 " ) conventional; it can be adapted to specific diameters and configurations.
  • the device also comprises, at the central channel C of the tool holder 2, a non-return valve 120 making it possible to close the central channel C in the event of reverse overpressure in the fluid.
  • the reverse overpressures are likely to appear during the use of the device of the invention in eruptive well, these reverse overpressures being able, in the absence of non-return valve, to reverse the direction of flow or circulation of the fluid in the central channel C, and therefore adversely affect the operation of the assembly.
  • the non-return valve 120 is pivotally mounted on a hinge 121 and in the open position as shown in FIG. 4a, and partially retracted into a housing 122 formed in the body of the tool holder 2.
  • the check valve 120 rests on an annular bead 123, forming a seat and formed substantially along a guideline of the central channel C.
  • the lower end of the tool holder and of the central channel C, the orifices, the nozzles 11 are under pressure and thus preserved from reverse external overpressure.
  • the sludge particles present in the fluid are then deposited by gravity outside the tool holder.
  • the advantage of the innovation lies in a plurality of operations combining cleaning by mechanical and hydraulic means associated with time savings and optimum operational security, whatever the type of well in which the intervention is performed.

Abstract

Device combining possibilities of clearing/cleaning wells of deposits and incrustations by lowering tool (1) while rotating it and circulating slurry (6), with high pressure jetting possibilities. The device comprises a tool holder (2) connected to the drill collars (7) at the top and to the tool (1) at the bottom, with calibrated openings (5) made blind by a sliding sleeve (4) while lowering the string. On completion of mechanical clearing, a plug (8) inside the string forms a seal with sleeve (4) and moves the latter downwards to uncover openings (5) so that the jetting operation may commence.

Description

Dispositif de curage et de nettoyage de puits. Device for cleaning and cleaning wells.
La présente invention a pour objet un dispositif permettant de combiner le nettoyage/curage des puits affectés de dépôts et incrustations par descente d'outil en rotation et circulation, avec, en simultané, un lavage au jet haute pression - communément appelé "jetting" - pour finition de l'état de surface.The present invention relates to a device making it possible to combine the cleaning / cleaning of wells affected with deposits and incrustations by lowering the tool in rotation and circulation, with, simultaneously, washing with a high pressure jet - commonly called "jetting" - for finishing the surface finish.
L'invention est notamment applicable au reconditionnement de puits affectés par des problèmes de dépôts / incrustations dûs aux caractéristiques physico¬ chimiques du fluide capté. Les moyens curatifs mécaniques permettant de réduire à défaut d'éradiquer, ces endommagements sont les suivants :The invention is particularly applicable to the reconditioning of wells affected by problems of deposits / incrustations due to the physico-chemical characteristics of the captured fluid. The mechanical curative means making it possible to reduce, failing to eradicate, these damages are the following:
. Garniture conventionnelle avec outil : les puits sont libérés de leurs dépôts par descente en rotation et circulation de boue, d'une garniture conventionnelle avec outil et tiges bien connue des spécialistes.. Conventional packing with tool: the wells are freed from their deposits by rotary descent and circulation of mud, from a conventional packing with tool and rods well known to specialists.
Hérisson de déparaffinage constitué d'un goupillon solidaire d'une tige lestée par une barre de charge, le tout connecté à un câble servant â la descente et remontée de l'ensemble ; les limites de ce moyen de curage sont bien connues en raison du principe même et de la nécessité de disposer d'un artésianisme suffisant pour remonter les dépôts après décollement de la paroi.Dewaxing hedgehog consisting of a brush attached to a rod weighted by a load bar, all connected to a cable used for the descent and ascent of the assembly; the limits of this cleaning method are well known because of the very principle and the need to have sufficient artesianism to raise the deposits after detachment from the wall.
. "Jetting" ou application d'un jet haute pression à diffusion radiale via généralement un outil tournant à buse unique ; ce type de lavage au jet des complétions est couramment pratiqué pour l'entretien des puits d'eau, d'hydrocarbures et de stockage de gaz ; cette technique est également utilisée pour la coupe des tubages sous le nom d'"abrasive jet".. "Jetting" or application of a high pressure jet with radial diffusion via generally a rotating tool with a single nozzle; this type of washing of the completions is commonly practiced for the maintenance of water wells, hydrocarbons and gas storage; this technique is also used for cutting casings under the name of "abrasive jet".
Ces moyens, dans l'état actuel de la technique, sont mis en oeuvre séparément. Le dispositif selon l'in¬ vention combine l'utilisation au lavage au jet haute pression avec celle d'une garniture conventionnelle.These means, in the current state of the art, are implemented separately. The device according to the invention combines the use of high pressure jet washing with that of a conventional packing.
Cette combinaison des potentialités de curage associées à chacun de ces deux moyens permet d'opérer un nettoyage préliminaire des parois du puits par descente d'un outil de forage en rotation et de parfaire le nettoyage lors de la remontée par un lavage au jet haute Orpression. Le dispositif selon l'invention permet cette mise en oeuvre - ou son interruption au moment voulu.This combination of cleaning potentials associated with each of these two means makes it possible to perform a preliminary cleaning of the walls of the well by lowering a rotating drilling tool and to perfect the cleaning during the ascent by washing with a high pressure jet. . The device according to the invention allows this implementation - or its interruption at the desired time.
Les figures 1, 2 et 3 ci-annexées permettent de mieux comprendre le principe du dispositif, la figure 1 représentant une vue en coupe longitudinale du dispositif objet de l'invention, la figure 2 représentant une vue en coupe longitudinale du dispositif objet de l'invention, dans une phase initiale d'utilisation d'ouverture des buses d'application de jet haute pression, la figure 3 représentant une vue en coupe longitudinale du dispositif objet de l'invention dans une phase finale d'utilisation d'ouverture des buses d'application de jet haute pression, la figure 4a représente en coupe longitudinale une variante avantageuse d'un mode de réalisation du dispositif objet de l'inventionn, muni d'un clapet anti-retour, représenté en position ouverte, et la figure 4b représente en coupe longitudinale le dispositif représenté en figure 4a, le clapet anti-retour étant représenté en position fermée. La figure 1 décrit les principaux composants de la garniture en cours de descente : l'outil 1 connecté au porte-outil 2 selon 1'invention ;Figures 1, 2 and 3 appended hereto provide a better understanding of the principle of the device, FIG. 1 representing a view in longitudinal section of the device object of the invention, FIG. 2 showing a view in longitudinal section of the device object of l invention, in an initial phase of use for opening the high-pressure jet application nozzles, FIG. 3 representing a view in longitudinal section of the device which is the subject of the invention in a final phase of use for opening the high pressure jet application nozzles, FIG. 4a represents in longitudinal section an advantageous variant of an embodiment of the device object of the invention, provided with a non-return valve, shown in the open position, and FIG. 4b shows in longitudinal section the device shown in FIG. 4a, the non-return valve being shown in the closed position. Figure 1 describes the main components of the lining during descent: the tool 1 connected to the tool holder 2 according to the invention;
- ce porte-outil 2 est muni de deux filetages permettant le raccordement aux masse-tiges 7 de la garniture en partie supérieure et à l'outil 1 en partie inférieure ;- this tool holder 2 is provided with two threads allowing connection to the drill rods 7 of the lining in the upper part and to the tool 1 in part lower;
- il comporte des orifices 5 reliés à un canal central C calibrés par des buses 11, situés dans un même plan perpendiculaire à l'axe de la garniture et mettant en communication 1'intérieur du porte-outil avec le puits à nettoyer ; dans un mode d'utilisation courante mais non limitatif, le porte-outil 2 comprend quatre orifices calibrés 5 ; de même, le diamètre usuel, non restrictif, des buses est compris entre 7/32" et 14/32" ; - une chemise 4 susceptible de coulisser dans le canal central C, aveugle ces orifices 5 par des étanchéités dynamiques 3 et est maintenue dans cette position (hute) par une goupille de cisaillement 10 ;- It includes orifices 5 connected to a central channel C calibrated by nozzles 11, located in the same plane perpendicular to the axis of the lining and placing the interior of the tool holder in communication with the well to be cleaned; in a common but nonlimiting mode of use, the tool holder 2 comprises four calibrated orifices 5; similarly, the usual, non-restrictive diameter of the nozzles is between 7/32 "and 14/32"; - A jacket 4 capable of sliding in the central channel C, blinds these orifices 5 by dynamic seals 3 and is held in this position (hute) by a shear pin 10;
- en cours de descente, la circulation de boue, illustrée par les flèches 6, permet la remontée des dépôts détachés du puits par l'outil 1 en rotation.- During the descent, the circulation of mud, illustrated by the arrows 6, enables the deposits detached from the well to rise by the rotating tool 1.
La figure 2 illustre la mise en place du bouchon 8, après lancement à l'intérieur de la garniture depuis la surface : - les seules ouvertures 9 offertes pour le passage de la boue au travers du bouchon 8 provoquent une surpression entraînant la rupture de la goupille de cisaillement 10 ; cette surpression pousse l'ensemble bouchon 8/chemise 4 vers le bas, comme représenté sur la figure 3, dégageant les orifices latéraux calibrés 5, autorisant ainsi le "jetting" ; les ouvertures 9 au travers du bouchon 8 permettent de maintenir une circulation à travers 1'outil 1, évitant ainsi tout risque de coincement ;FIG. 2 illustrates the installation of the plug 8, after launching inside the lining from the surface: - the only openings 9 offered for the passage of the mud through the plug 8 cause an overpressure causing the rupture of the shear pin 10; this overpressure pushes the plug 8 / jacket 4 assembly downward, as shown in FIG. 3, releasing the calibrated lateral orifices 5, thus allowing "jetting"; the openings 9 through the plug 8 make it possible to maintain circulation through the tool 1, thus avoiding any risk of jamming;
- le bouchon 8 est muni d'un col de repêchage 12 permettant le cas échéant sa récupération au moyen du "cable de curage" qui équipe chaque appareil de forage ; cette opération rétablit totalement la circulation à travers l'outil.- The plug 8 is provided with a fishing neck 12 allowing, where appropriate, its recovery by means of the "cleaning cable" which is fitted to each drilling rig; this operation completely restores circulation through the tool.
Le dispositif selon l'invention peut être adapté à tous tubages (7" - 9 5/8" - 13 3/8"), complétions (5 1/2" - 5 3/4" - 6") et découverts (6" - 8 1/2" - 12") conventionnels ; il peut être adapté à des diamètres et des configurations particulières. Un mode de réalisation du dispositif selonThe device according to the invention can be adapted to all casings (7 "- 9 5/8" - 13 3/8 "), completions (5 1/2" - 5 3/4 "- 6") and exposed (6 "- 8 1/2" - 12 " ) conventional; it can be adapted to specific diameters and configurations. An embodiment of the device according to
1'invention plus particulièrement destiné à être utilisé en puits éruptif sera décrit en liaison avec les figures 4a et 4b.1'invention more particularly intended to be used in eruptive well will be described in connection with Figures 4a and 4b.
Selons les figures précitées, le dispositif comporte en outre, au niveau du canal central C du porte-outil 2, un clapet anti-retour 120 permettant d'obturer le canal central C en cas de surpression inverse dans le fluide. Les surpressions inverses sont susceptibles d'apparaître lors de l'utilisation du dispositif de l'invention en puits éruptif , ces surpressions inverses pouvant, en l'absence de clapet anti-retour, inverser le sens d'écoulement ou de circulation du fluide dans le canal central C, et donc nuire au fonctionnement de l'ensemble. Le clapet anti-retour 120 est monté à pivotement sur une charnière 121 et en position d'ouverture telle que représentée en figure 4a, et partiellement escamoté dans un logement 122 ménagé dans le corps du porte-outil 2. En position de fermeture, le clapet anti-retour 120 prend appui sur un bourrelet annulaire 123, formant siège et ménagé sensiblement selon une ligne directrice du canal central C. En position de fermeture, l'extrémité basse du porte-outil et du canal central C, les orifices, les buses 11 sont en équipression et ainsi préservés d'une surpression externe inverse. Les particules de boues présentes dans le fluide se déposent alors par gravité à 1'extérieure du porte-outil.According to the aforementioned figures, the device also comprises, at the central channel C of the tool holder 2, a non-return valve 120 making it possible to close the central channel C in the event of reverse overpressure in the fluid. The reverse overpressures are likely to appear during the use of the device of the invention in eruptive well, these reverse overpressures being able, in the absence of non-return valve, to reverse the direction of flow or circulation of the fluid in the central channel C, and therefore adversely affect the operation of the assembly. The non-return valve 120 is pivotally mounted on a hinge 121 and in the open position as shown in FIG. 4a, and partially retracted into a housing 122 formed in the body of the tool holder 2. In the closed position, the check valve 120 rests on an annular bead 123, forming a seat and formed substantially along a guideline of the central channel C. In the closed position, the lower end of the tool holder and of the central channel C, the orifices, the nozzles 11 are under pressure and thus preserved from reverse external overpressure. The sludge particles present in the fluid are then deposited by gravity outside the tool holder.
L'avantage de 1'innovation réside dans une pluralité de fonctionnement combinant nettoyage par voie mécanique et hydraulique associée à un gain de temps et à une sécurité opérationnelle optimale, quel que soit le type de puits dans lequel l'intervention est réalisée. The advantage of the innovation lies in a plurality of operations combining cleaning by mechanical and hydraulic means associated with time savings and optimum operational security, whatever the type of well in which the intervention is performed.

Claims

REVENDICATIONS 1. Dispositif combinant les possibilités de curage/nettoyage de puits affectés de dépôts et incrustations, par descente d'outil (1) en rotation et CLAIMS 1. Device combining the cleaning and cleaning possibilities of wells affected by deposits and incrustations, by lowering the tool (1) in rotation and
5 circulation de boue (6) avec celles de lavage au jet haute5 mud circulation (6) with those of high jet washing
, pression - appelé "jetting" -, caractérisé en ce qu'il comprend un porte-outil (2) muni d"ouvertures calibrées (5) qui sont aveuglées par une chemise coulissante (4) pendant la descente de la garniture (7) et curage mécanique, en ce, pressure - called "jetting" -, characterized in that it comprises a tool holder (2) provided with "calibrated openings (5) which are blinded by a sliding jacket (4) during the descent of the lining (7) and mechanical cleaning, in this
10 que la chemise (4) peut être déplacée vers le bas pour dégager les ouvertures (5) et commencer l'opération de "jetting" après mise en place à l'intérieur de la garniture d'un bouchon (8) venant faire étanchéité sur le siège de la chemise (4).10 that the jacket (4) can be moved downwards to clear the openings (5) and start the "jetting" operation after fitting inside the lining of a plug (8) sealing on the seat of the shirt (4).
15 2. Dispositif selon revendication 1, caractérisé en ce que le bouchon (8) est muni d'ouvertures (9) permettant de maintenir une circulation à travers 1'outil (1) pendant l'opération de lavage au jet.2. Device according to claim 1, characterized in that the plug (8) is provided with openings (9) making it possible to maintain circulation through the tool (1) during the jet washing operation.
3. Dispositif selon revendication 1, caractérisé en ce 20 que le bouchon 8 est muni d'un col (12) permettant son repêchage par un câble de curage standard.3. Device according to claim 1, characterized in that the plug 8 is provided with a neck (12) allowing its recovery by a standard cleaning cable.
4. Dispositif selon revendication 1, caractérisé en ce que la chemise coulissante (4) est maintenue en position sur le porte-outil (2) par une goupille de cisaillement4. Device according to claim 1, characterized in that the sliding jacket (4) is held in position on the tool holder (2) by a shear pin
25 (10) qui est tarée pour se rompre après mise en place du bouchon (8) et application d'une surpression dans le circuit de boue.25 (10) which is tared to break after the plug (8) is installed and an overpressure is applied in the mud circuit.
5. Dispositif selon l'une des revendications précédentes, caractérisé en ce que celui-ci comporte en5. Device according to one of the preceding claims, characterized in that it comprises in
30 outre au niveau d'un canal central C du porte-outil (2), un clapet anti-retour (120), permettant d'obturer ledit canal , central C sur surpression inverse dans le fluide. 30 in addition to a central channel C of the tool holder (2), a non-return valve (120), making it possible to close said central channel C, reverse overpressure in the fluid.
PCT/FR1991/000181 1990-03-07 1991-03-06 Well clearing and cleaning device WO1991014076A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9002873A FR2659384B1 (en) 1990-03-07 1990-03-07 DEVICE FOR CURING AND CLEANING WELLS AFFECTED BY DEPOSITS AND INCRUSTATIONS.
FR90/02873 1990-03-07

Publications (1)

Publication Number Publication Date
WO1991014076A1 true WO1991014076A1 (en) 1991-09-19

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FR (1) FR2659384B1 (en)
WO (1) WO1991014076A1 (en)

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EP0512331A1 (en) * 1991-05-06 1992-11-11 WAVE TEC Ges.m.b.H. Device for cleaning the well-bore-surrounding-zone
WO1993007358A1 (en) * 1991-09-30 1993-04-15 Wepco As Circulation equipment
US5337819A (en) * 1992-06-29 1994-08-16 Den Norske Stats Oljeselskap A.S. Washing tool
WO1997014868A1 (en) * 1995-10-16 1997-04-24 Magne Hovden Purging means for purging upwards in ring spacing between drill pipe and bore hole wall
GB2346397A (en) * 1999-02-03 2000-08-09 Sofitech Nv Annulus pressure activated discharge valve for enhanced fluid return flow
US7316919B2 (en) 2003-02-19 2008-01-08 Nysa Membrane Technologies Composite materials comprising supported porous gels
RU2471958C1 (en) * 2011-07-15 2013-01-10 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Jet cleaning device for well shaft
US9873088B2 (en) 2011-05-17 2018-01-23 Natrix Separations Inc. Layered tubular membranes for chromatography, and methods of use thereof
US10800808B2 (en) 2008-09-02 2020-10-13 Merck Millipore Ltd. Chromatography membranes, devices containing them, and methods of use thereof

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GB9525008D0 (en) * 1995-12-07 1996-02-07 Red Baron Oil Tools Rental Bypass valve
CN102322232B (en) * 2011-08-26 2013-11-06 中国石油天然气股份有限公司 Borehole sand-washing string and sand-washing method

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DE2011475A1 (en) * 1969-03-13 1970-09-24 Chevron Research Company, San Francisco, Calif. (V.St.A.) Method and device for cleaning a borehole
US3814180A (en) * 1972-08-31 1974-06-04 Cities Service Oil Co Well fishing apparatus
US4406335A (en) * 1980-10-30 1983-09-27 Nick Koot Special circulation sub
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GB908869A (en) * 1961-03-23 1962-10-24 Archer William Kammerer Method and apparatus for conditioning bore holes
DE2011475A1 (en) * 1969-03-13 1970-09-24 Chevron Research Company, San Francisco, Calif. (V.St.A.) Method and device for cleaning a borehole
US3814180A (en) * 1972-08-31 1974-06-04 Cities Service Oil Co Well fishing apparatus
US4406335A (en) * 1980-10-30 1983-09-27 Nick Koot Special circulation sub
US4967841A (en) * 1989-02-09 1990-11-06 Baker Hughes Incorporated Horizontal well circulation tool

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512331A1 (en) * 1991-05-06 1992-11-11 WAVE TEC Ges.m.b.H. Device for cleaning the well-bore-surrounding-zone
US5311955A (en) * 1991-05-06 1994-05-17 Wave Tec Ges.M.B.H. Installation for cleaning the zone near the drill hole
WO1993007358A1 (en) * 1991-09-30 1993-04-15 Wepco As Circulation equipment
GB2275486A (en) * 1991-09-30 1994-08-31 Wepco As Circulation equipment
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FR2659384B1 (en) 1995-09-15
FR2659384A1 (en) 1991-09-13

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