EP0417009B1 - Device and installation for the cleaning of drains especially in an oil production well - Google Patents

Device and installation for the cleaning of drains especially in an oil production well Download PDF

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Publication number
EP0417009B1
EP0417009B1 EP19900402457 EP90402457A EP0417009B1 EP 0417009 B1 EP0417009 B1 EP 0417009B1 EP 19900402457 EP19900402457 EP 19900402457 EP 90402457 A EP90402457 A EP 90402457A EP 0417009 B1 EP0417009 B1 EP 0417009B1
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EP
European Patent Office
Prior art keywords
device
characterised
fluid
accordance
pipe
Prior art date
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 - Lifetime
Application number
EP19900402457
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German (de)
French (fr)
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EP0417009A1 (en
Inventor
Henri Cholet
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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Publication date
Priority to FR8911693 priority Critical
Priority to FR8911693A priority patent/FR2651451B1/en
Application filed by IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP0417009A1 publication Critical patent/EP0417009A1/en
Application granted granted Critical
Publication of EP0417009B1 publication Critical patent/EP0417009B1/en
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Expired - Lifetime legal-status Critical Current

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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
    • E21B41/00Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0078Nozzles used in boreholes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/267Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being deflected in determined directions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00Cleaning hollow articles by methods or apparatus specially adapted thereto
    • B08B9/02Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027Cleaning the internal surfaces; Removal of blockages
    • B08B9/032Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • B08B9/035Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing by suction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00Cleaning hollow articles by methods or apparatus specially adapted thereto
    • B08B9/02Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027Cleaning the internal surfaces; Removal of blockages
    • B08B9/04Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/043Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes
    • B08B9/0433Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes provided exclusively with fluid jets as cleaning tools
    • 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
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/12Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
    • 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

Description

  • The present invention relates to apparatus and installations for cleaning horizontal drains in oil production wells.
  • We know that the production of wells in sandy deposits, by means of horizontal drains, leads to the entrainment of sand by the fluid flowing from the deposit and to significant deposits in this sand or other sediments, mainly in the horizontal part of the drains. This results in a significant decrease in the production of wells.
  • Known from US-A-4,671,359 is an apparatus for cleaning accumulations of solids on the top of a tube suspension. However, this appliance cannot clean the interior of horizontal drains.
  • We know from patents US-A-4,630,691 and US-A-370,592 devices for drilling wells delimiting two conduits. However, these devices are not suitable for removing the accumulation of solids in the drains.
  • Patent US-A-4,744,420 discloses a device for cleaning such horizontal drains, which comprises at the end of two concentric casings a body provided with nozzles or nozzles for projecting a cleaning fluid, this body delimiting a path supply of cleaning fluid, connected to said nozzles, as well as a return path of this fluid charged with solid particles of sand or other sediments, these two paths being respectively connected to one of the two conduits delimited by the two casings concentric.
  • In this known device, the projection nozzles for cleaning fluid are arranged at the end of the body and oriented substantially parallel to the axis of the drain. Such an arrangement tends to drive the sand and other sediments accumulated in the drain in front of the device.
  • It is this problem in particular that the invention proposes to solve, so as to achieve more effective cleaning of such horizontal or substantially horizontal drains.
  • To this end, the subject of the invention is an apparatus for cleaning a horizontal or gently sloping drain, adapted to be disposed at the downstream end of two concentric casings, delimiting two also concentric conduits, this apparatus comprising a body which is provided at its end with at least one fluid spray nozzle and which delimits on the one hand a cleaning fluid supply path and on the other hand a return path for the fluid loaded with solid sand particles or other sediments, these two paths being intended to be connected respectively to the two conduits delimited by the casings, characterized in that it comprises deflector means cooperating with said nozzle to direct the jet of the fluid leaving the or each nozzle in the direction of the wall of the drain where the solid particles accumulate and in that said deflectors are adapted to optimize the shape of said jet.
  • According to other characteristics:
    • the deflector is arranged so as to orient the fluid jet downwards,
    • the deflector is articulated on a support itself fixed on the downstream part of the body,
    • the fluid supply path comprises, from upstream to downstream, in the body, an annular conduit, at least one radial passage and an axial conduit, and the return path of the fluid loaded with particles comprises, from 'downstream upstream, at least one conduit extending from the side wall of the front part of the body, at least one longitudinal conduit, an annular conduit surrounding an injector of working fluid and an axial conduit,
    • the annular duct and the axial duct of the return path form a venturi which constitutes with the injector a suction device,
    • the injector is supplied with working fluid from the radial passage and the axial duct of the supply path, the fluid flow being distributed in the axial duct in two opposite flows, directed respectively to the nozzle and to the injector,
    • the body is connected at its rear or upstream part to a connector comprising two sets of conduits which communicate respectively an upstream axial conduit with a downstream annular conduit and an upstream annular conduit with a downstream axial conduit.
  • The invention also relates to an installation comprising such an apparatus and further characterized in that it comprises a connection box divided into two chambers connected at their upstream part to two casings arranged side by side and at their downstream part to the two concentric casings.
  • The invention will be described in more detail below with reference to the accompanying drawings, given solely by way of example and in which:
    • FIG. 1 is a view in longitudinal section of an apparatus according to the invention,
    • FIG. 2 is a sectional view along line 2-2 of FIG. 1,
    • FIG. 3 is a sectional view similar to that of FIG. 2 of an alternative embodiment,
    • FIG. 4 is a partial view in longitudinal section of another alternative embodiment,
    • FIG. 5 is a sectional view along line 5-5 of FIG. 4,
    • FIGS. 6, 7 and 8 are three schematic views illustrating three successive phases of the implementation of an installation according to the invention,
    • Figure 9 is a detailed sectional view of a connection box used in such an installation.
  • We see in Figure 1 a horizontal or substantially horizontal drain section 10 connected to a main casing 1 (Fig. 6).
  • In this drain, two concentric casings 14, 16 are arranged delimiting between them an annular duct 17, while the inner casing delimits an axial duct 19. The downstream end of the inner casing 14 is set back with respect to the downstream end of the outer casing and it is between these two ends that arranged the apparatus according to the invention.
  • This device comprises a body 20 produced in several parts, in this case three, produced and arranged so as to fulfill several functions which will be described in more detail below. These three parts are: an external part 22, a front central part 24 and a rear central part 26.
  • The outer part 22 is received in a sheath 28 whose inner surface 29 preferably has a frustoconical shape, this sheath being fixed in any suitable known manner to the end of the casing 16, for example by means of a collar 30.
  • This outer part 22 is hollow and has at its end directed downstream of the device a head 32 projecting from the sheath and which is pierced with an axial duct 34 and three conduits 35, separated from the conduit 34 and which open into the side wall of the head 32. The conduits 35 are arranged at 120 ° relative to one another. Depending on the size of the device, a greater number of such conduits can be provided, for example 6. The conduit 34 opens into a housing 36 in which is fixed a nozzle 38 for spraying fluid.
  • On this same head is fixed by connecting members such as, for example, the three spacers 40, a support 42 for a deflector 44 which is located opposite the nozzle 38. In the embodiment shown in FIG. 1, the deflector 44 is mounted on a ball joint 46 and has an unbalance sufficient to occupy a determined position relative to the adjacent drain, the concave wall 45 of this deflector being directed towards the bottom wall of this drain.
  • As shown in Figures 2 and 3, this concave part 45 to 45 b can take various forms, depending on whether one wishes to obtain a wide jet (Fig. 2) or a narrower jet (Fig. 3).
  • Behind the conduit 34, the part 22 of the body comprises a housing 48 in which is received the central part 24 of the body which delimits on the one hand an axial through conduit 50 arranged in the extension of the conduit 34, at least one radial passage 52 making this central conduit communicate with an annular conduit 54 delimited between the central parts of the body and the external part, and at least one longitudinal duct 56, which is part of the return path of the fluid loaded with solid particles. In the embodiment shown, three conduits 56 are provided, arranged in the extension of the three conduits 35.
  • Going backwards, the outer part of the body has a tubular shape with a frustoconical intermediate portion 22 a and two cylindrical end portions 22 b , 22 c , the end portion 22 b of smaller diameter being connected to the inner casing 14 by a fitting 60.
  • The latter includes two sets of conduits:
    • a first set of three conduits 62 which provide communication between the interior 19 of the casing 14 and an annular conduit 64 delimited between the exterior part of the body and the rear central part 26 of this same body,
    • a second set of three conduits 66 ensuring communication between the annular space 17 delimited between the two casings, and the axial conduit 73 of the body.
  • The rear central part 26 of the body is fixed on the one hand to the internal downstream end of the connector 60 and on the other hand to the external wall of the front central body 24. The part 26 forms a venturi and delimits a converging cone 68, a neck 70 then a divergent cone 72 to constitute, with an injector 74 fixed in the central body, a suction device the function of which will be specified below.
  • The outer casing is held in the drain 10 by an elastic centering device 76 of known construction.
  • Furthermore, a cup 78 is interposed between the outer casing 16 and the connector 60 in order to avoid the deposit of sand or other solid particles at the end of the annular gap 80 delimited between the body and the outer casing.
  • The operation of this device is as follows:
  • The inner casing 14 is supplied with fluid, in this case water, from the surface. This fluid, arriving in the connector 60 passes from the axial duct 19 to the annular duct 64 delimited between the central and external parts of the body, to reach the radial passage 58.
  • Arrived in the axial duct 50, the working fluid is divided into two directed flows, one towards the nozzle 38 and the other towards the injector 74. The respective sections of the nozzle and the injector are chosen so as to obtain a determined distribution of the flow rate, which can for example be 3 / 5th of the incident flow in the direction of the injector and 2 / 5th in the direction of the nozzle 38.
  • The jet of fluid emitted by the nozzle 38 is deflected by the deflector 44 towards the lower wall of the drain and causes effective agitation of the solid particles of sand or other sediments accumulated in the drain. The fluid charged with these particles is sucked at the level of the duct 35, this suction effect being caused in the venturi 68-72 by the second flow of working liquid, emitted by the injector 74. The working fluid and the working liquid particles mix in the part 70, 72 of the body and are directed towards the surface by crossing the fitting 60 by the conduits 66 and by traversing the annular conduit 17 delimited between the two casings.
  • The presence of a single nozzle and of a deflector directing the jet of fluid towards the drain, have the effect of concentrating the energy of the jet towards the sandy deposit and thus a substantially improved efficiency is obtained.
  • In addition, the concave shape of the deflector makes it possible to give the jet an optimal shape, according to the size and the consistency of the sandy deposits. In this regard, it can be noted that this deposit is often made coherent by deposits of hydrocarbons, which makes the energy concentration effect obtained by the apparatus according to the invention all the more important.
  • It is also advantageous to use an annular conduit for the return of the fluid charged with particles because the available section is larger.
  • There is shown in Figures 4 and 5 a mounting variant of the deflector, according to which the ball joint of Figure 1 is replaced by a mounting around an axis 82 on which the deflector is mounted oscillating.
  • In this regard, it may be added that the unbalance of the deflector can be obtained by various means such as the asymmetrical shape of the deflector, the asymmetrical reduction of the latter or the use of materials with different densities.
  • More generally, the device can be the subject of many other variants, both in the production of the parts that compose it and in the number and arrangement of the various supply and return conduits for the cleaning fluid.
  • We will now describe in connection with the other figures an installation in which the apparatus described above is integrated, as well as an operating mode.
  • FIG. 6 represents a main casing 12 which extends from the surface and which comprises a substantially vertical part, then a curved part, to be extended by the substantially horizontal drain 10.
  • First of all, the external casing 16 provided with its centering device 76 and carrying the sleeve 28 at its end is introduced into this main casing.
  • Then, as shown in FIG. 7, one descends inside the casing 16 the inner casing 14 carrying at its end the actual apparatus which takes place in the seat constituted by the sheath 28.
  • As is known in the art, the casings 14 and 16 can be formed either by rigid tubes screwed to each other, or by continuous elements unwound from the surface.
  • The installation can of course be completed by connecting the inner casing to a pump supplying water under an appropriate pressure, and by connecting the outer casing to known means for extracting the liquid laden with particles.
  • However, according to an additional characteristic of the invention, a connection box 100 is used for this purpose, making it possible to switch from a concentric arrangement of the casings 14, 16 downstream of this box, to a side-by-side arrangement, upstream of said box. This result is obtained thanks to the arrangement shown in FIG. 9 in which it can be seen that the connection box 100 is divided into two chambers 102, 104 of which the first 102 can be connected at its upper part to a casing 106 whose section corresponds to the section of the annular gap between the two concentric casings 14 and 16 while it opens at its lower end into a section of tube 108 which can be connected by a connector 110 to the upper part of the outer casing 16.
  • Figure 9 is a block diagram, the shapes are actually adapted to assume a good flow.
  • The second chamber 104 is connected at its upper part to a casing 112 of the same section as the inner casing 14, while at its lower part it opens into a section of tube 114 which can be connected to the inner casing 14, either by a simple connection if the two inner and outer casings are substantially at the same level, preferably by a sleeve 116 and a fitting 118, as is generally the case, the two concentric casings do not have the same length.
  • It is such an arrangement which is shown in FIG. 8 where it can be seen that the connection box 100 is lowered into the main casing, the additional casing elements 106 and 112 being added to the upper part of this box, when the device must be advanced down the drain. The casing 112 is connected to a pump 114 and the casing 106 to a settling tank 116.
  • Such an arrangement is particularly advantageous because it facilitates the addition of additional tubing, the side-by-side arrangement being in this respect much more favorable than the concentric arrangement.
  • The device according to the invention also has great flexibility of use and adaptation. Indeed, if it is desired to perform a peripheral cleaning operation of the main casing or of the drain, the orientable or articulated deflector can be replaced by a fixed deflector disposed substantially perpendicular to the axial jet, and which projects the fluid onto a 360 ° angle.
  • The conduits 35 may in particular have an axial direction.
  • Furthermore, the direction of these conduits 35 as well as the distance separating these conduits from the deflector 44 can be determined to allow efficient removal of the cuttings.

Claims (15)

  1. A device for cleaning a horizontal or slightly inclined drain designed to be positioned at the downstream end of two concentric tubes (14, 16) delimiting two pipes (17, 19) which are also concentric, this device comprising a body (20) fitted at its end with at 5 least one nozzle (38) for projecting fluid and which delimits a supply path for cleaning fluid on the one hand and a return path for the fluid carrying solid particles of sand or other sediment on the other, these two paths being joined respectively to two pipes (17, 19) delimited by the tubing, characterised in that it has deflecting means (44) co-operating with the nozzle (38) to direct the jet of fluid coming from the or each nozzle in the direction of ) the wall of the drain where the solid particles have accumulated and in that these deflectors are designed to optimise the shape of the jet.
  2. A device in accordance with claim 1, characterised in that the deflector (44) is arranged in such a way that it orients the jet of fluid downwards.
  3. A device in accordance with one of claims 1 and 2, characterised in that the deflector (44) is articulated on a support (42) itself fixed on the downstream part of the body (20).
  4. A device in accordance with claim 3, characterised in that the deflector (44) is mounted on the support (42) by means of a ball joint (46).
  5. A device in accordance with claim 3, characterised in that the deflector (44) is articulated on the support (42) on which it is mounted so as to oscillate on an axle (82).
  6. A device in accordance with one of claims 3 to 5, characterised in that the deflector (44) has an imbalance and tends to hold a given position relative to its support.
  7. A device in accordance with one of claims 1 to 6, characterised in that the fluid supply path comprises in the body (2), from upstream to downstream, an annular pipe (54), at least one radial passage (52) and an axial pipe (50, 34), whilst the return path for the fluid carrying the particles has, from downstream to upstream, at least one pipe (35) extending from the lateral wall of the front section of the body (20), at least one longitudinal pipe (56), an annular pipe (68) surrounding an injector (74) for the operating fluid and an axial pipe (70, 72).
  8. A device in accordance with claim 7, characterised in that the annular pipe (68) and the axial pipe (70, 72) form a venturi tube which, together with the injector, forms a suction device.
  9. A device in accordance with one of claims 7 and 8, characterised in that the injector (74) is supplied with operating fluid from the radial passage (52) and the axial pipe (50), the fluid flow being split inside the axial pipe (50) into two opposite flows directed respectively towards the nozzle (58) and the injector (74).
  10. A device in accordance with claim 9, characterised in that the section of the passage of the injector (74) is greater than that of the nozzle (38).
  11. A device in accordance with one of claims 1 to 10, characterised in that the body (20) is connected at its rear or upstream section to a connector (60) having two sets of pipes (62, 66) which provide communication respectively between an upstream axial pipe (19) and a downstream pipe (64) and between an upstream annular pipe (19) and a downstream axial pipe (73).
  12. An installation for cleaning horizontal or slightly inclined drains, particularly in a well under petroleum production comprising: two concentric tubes (14,16) delimiting two pipes (17, 19) also concentric; a device for projecting a cleaning fluid and evacuating this fluid when carrying particles; delivery means for the cleaning fluid and means for evacuating the fluid carrying particles, located at the surface and connected respectively to one of the concentric pipes (17, 19), characterised in that the device is as defined in any of claims 1 to 11.
  13. An installation in accordance with claim 12, characterised in that the means for supplying the cleaning fluid are connected to the pipe (19) delimited by the inner tube (14).
  14. An installation in accordance with one of claims 12 and 13, characterised in that it comprises a junction box (100) divided into two chambers (102, 104) connected at their upstream section to two tubes (106, 112) arranged side by side and at their downstream section to two concentric tubes (14, 16).
  15. An installation in accordance with claim 14, characterised in that this junction box is connected to at least one of the concentric tubes (14, 16) by means of an intermediary sleeve (116).
EP19900402457 1989-09-07 1990-09-06 Device and installation for the cleaning of drains especially in an oil production well Expired - Lifetime EP0417009B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8911693 1989-09-07
FR8911693A FR2651451B1 (en) 1989-09-07 1989-09-07 Apparatus and installation for cleaning drains, especially in a well for oil production.

Publications (2)

Publication Number Publication Date
EP0417009A1 EP0417009A1 (en) 1991-03-13
EP0417009B1 true EP0417009B1 (en) 1994-08-17

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Family Applications (1)

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EP19900402457 Expired - Lifetime EP0417009B1 (en) 1989-09-07 1990-09-06 Device and installation for the cleaning of drains especially in an oil production well

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US (1) US5086842A (en)
EP (1) EP0417009B1 (en)
CA (1) CA2024866C (en)
DK (1) DK0417009T3 (en)
FR (1) FR2651451B1 (en)
NO (1) NO300282B1 (en)

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FR2651451A1 (en) 1991-03-08
FR2651451B1 (en) 1991-10-31
DK0417009T3 (en) 1994-09-12
NO903864L (en) 1991-03-08
NO903864D0 (en) 1990-09-05
EP0417009A1 (en) 1991-03-13
CA2024866C (en) 2000-09-19
NO300282B1 (en) 1997-05-05
US5086842A (en) 1992-02-11
CA2024866A1 (en) 1991-03-08

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