EP2378055A1 - Verfahren zur Rekonstruktion von Brunnen durch Entfernung der alten Verkleidung mittels einer einzigen Gegenstromperforation und zugehörige Vorrichtung - Google Patents

Verfahren zur Rekonstruktion von Brunnen durch Entfernung der alten Verkleidung mittels einer einzigen Gegenstromperforation und zugehörige Vorrichtung Download PDF

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Publication number
EP2378055A1
EP2378055A1 EP10425119A EP10425119A EP2378055A1 EP 2378055 A1 EP2378055 A1 EP 2378055A1 EP 10425119 A EP10425119 A EP 10425119A EP 10425119 A EP10425119 A EP 10425119A EP 2378055 A1 EP2378055 A1 EP 2378055A1
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EP
European Patent Office
Prior art keywords
well
drilling device
perforation
circular crown
way
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.)
Withdrawn
Application number
EP10425119A
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English (en)
French (fr)
Inventor
Nicola Cempini
Stefano Chiarugi
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.)
Landi Di Stefano Chiarugi & C Sas
Acque Ingegneria SRL
Original Assignee
Landi Di Stefano Chiarugi & C Sas
Acque Ingegneria SRL
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 Landi Di Stefano Chiarugi & C Sas, Acque Ingegneria SRL filed Critical Landi Di Stefano Chiarugi & C Sas
Priority to EP10425119A priority Critical patent/EP2378055A1/de
Publication of EP2378055A1 publication Critical patent/EP2378055A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/02—Core bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring

Definitions

  • the present invention concerns the technical field relative to the construction and the maintenance of water wells.
  • the invention refers to an innovative device for the reconstruction/maintenance of a well and the relative method.
  • Such a device is therefore able to drill the ground concentrically with respect to the well, thus detaching a circular crown of material that covers the casing of the well for the possible overall sinking length of the coring device, realizing at the same time a communication channel (always in the shape of a circular crown) external to the bell of the coring device.
  • a communication channel (always in the shape of a circular crown) external to the bell of the coring device.
  • such a coring tube is anyway configured in such a way as to perforate a circular crown of material of a diameter only a bit larger than the well itself.
  • the coring device during all the perforation, always maintains itself in proximity of the well, penetrating deep through the aggregate material that surrounds the well by its length, that is the cementing and the underlying gravel pack.
  • a "bearing" effect is inevitably created due to the physical features of such a casehardening and of the gravel pack by which, once a certain perforation direction (vertical) is set, it is not possible to vary its trajectory.
  • the high structural rigidity of such a tube contributes to significantly increase the guidance difficulties during the perforation.
  • the well (1) in accordance with the background art of realization, is provided with a well casing (2) installed in the ground surrounded by a aggregate material (16, 17) that extends in depth on a part or on the whole length of the well itself.
  • the drilling device (3) therefore comprises a tube (4) provided with one or more cutting utensils (6, 6') to realize the sinking concentrically to the well.
  • the cutting utensils (6, 6') result configured in such a way as to dig when in use a circular crown (11) substantially concentric to the well, the said circular crown having an external diameter D of length such that the fixing aggregate (16, 17) results wholly arranged substantially inside of the external perimeter (11') of such a circular crown (11).
  • the perimeter that delimits the aggregate is contained in the perimeter 11 of the circular crown realized.
  • the tube 4 during all the sinking of it, does not penetrate moving itself inside the said aggregate material, but it totally removes the aggregate material thanks to the wide area of action of the blades.
  • the bearing effect of the ground is therefore significantly reduced and the manoeuvrability of the device results greatly enhanced.
  • the technical problem related to the potential risk of interception of the old well casing is solved.
  • the aggregate material (16, 17) can be arranged around the well in such a way as to form a circular crown of a diameter D' minor with respect to the said external diameter D .
  • one or more flanged rods (5) can be provided, connectable in a removable manner to the tube (4) in such a way as to vary the overall length of the drilling device (3).
  • the perforating utensils can comprise fixed blades (6, 6').
  • the perforating utensils can comprise rotating cones (6, 6').
  • the diameter D of the circular crown (11) can be comprised between the 900 millimetres and the 1000 millimetres, preferably 1000 millimetres.
  • the diameter D' of the aggregate is contained within the 700 and the 800mm.
  • the height H of the drilling device can be comprised between 2,5 metres and 3 metres, and preferably 3 metres.
  • the well driller machine is provided with a tilting top-head driver to which the drilling device (3) described can be connected.
  • an aspiration group (7, 8) is further provided with for causing the descent by gravity of a washing fluid into the circular crown (11) and the contemporary aspiration of the said fluid along the tube (4) of the drilling device (3).
  • the method therefore comprise the operations of:
  • the perforating operation is controlled in such a way that the dug circular crown (11) results with an external diameter D such that the aggregate material (16, 17) is arranged entirely inside the external perimeter (11') of the said circular crown (11).
  • the operation of application of a collection container (12) arranged on top of the well (1) is further foreseen, to collect the heavy detritus that is not aspirated.
  • a well 1 is schematically represented comprising a well casing 2 inserted in the ground in such a way as to convey the water of the intercepted ground water.
  • the well casing 2 is surrounded, at least in part of its length, by an aggregate material, that is a cementing 17 and an underlying gravel pack 16 arranged in the deepest part of the well, below the cementing.
  • the aggregate material (16, 17) is arranged around the well along its depth in such a way as to form substantially a circular crown indicated in section of figure 1 with an external diameter D' .
  • Indicative values of such extension of the external diameter D' are of about 800 mm, even if such a reference value can be lower, with diameters of the well 1 particularly reduced, for example below the 400 mm.
  • Always figure 1 shows the old filters 18 arranged at the bottom of the well, while a generic depth quota of the well is indicated with h .
  • a drilling device 3 also called rock-bit, comprises a tube 4 provided with an attaching-flange 5 for connecting the tube 4 to a drilling string 10.
  • the drilling string 10, as per figure 3 is composed of one or more flanged rods 7 (axially holed) connectable among them through the flanges in such a way as to realize an extension of the drilling device 3 on the basis of the length of depth that wants to be reached.
  • flanged rods 7 axially holed
  • the tube 4 on the opposite part of the attachment flange 5, supports one or more perforating utensils (6, 6') configured with a profile with rotating blades or rotating cones, depending on the basis of the characteristics of the ground to be perforated.
  • the blades or the cones are arranged along the tube 4 and configured in such a way that, during all the perforation, they realize a circular crown, concentric to the well, with an external diameter D such that the aggregate of material (16, 17) results entirely arranged inside the external perimeter 11' defined by the said crown.
  • FIG. 2 The schematisation of figure 2 in fact shows a perforating utensil 6 (blade or cone) of an overall diameter D .
  • the tube 4 is then provided with further one or more perforating utensils 6' with a progressively reduced diameter up to arriving to a diameter similar to the one of the well to be removed, in such a way as to detach a thin circular crown 9 of material in adherence to the well.
  • the first effect refers to the fact that the drilling string results extremely flexible during the penetration since the wide blades or cones remove entirely all the crown of cementing 17 and the gravel pack 16 surrounding the old well 2.
  • the "bearing" effect of the ground is therefore significantly reduced.
  • a wide circular crown around the well results now wholly cleaned.
  • the diameter D is preferably, but not necessarily, of a value of about 1000 mm.
  • the diameter d' of the cutting utensil 6' is chosen on the basis of the diameter of the old well to be recovered in such a way as to detach a crown of material 9 in adherence to the well of a very reduced thickness.
  • the external diameter d of the tube 4 is preferably a standard value of 368 mm or 406 mm.
  • the said diameter values ( D; d; d' ) of the tube 4, together with the cutting utensils, can, if need be, take into account particular values of project in use in the realization of the wells and there in that sense eventually move away from the ones indicated before.
  • the profile of the utensils can be of any form and nature. In any case, the dug perimeter contains inside the aggregate material.
  • the realization material of the flanged rods 7 and of the drilling device 3 is generally made of high resistance iron, while the thicknesses vary within a range of 8-10 mm.
  • the overall length H of each flanged rod 7 and of the drilling device 3 does not result superior to three metres. Such constructive values, therefore, further contribute in rendering the drilling string 10 altogether extremely manoeuvrable.
  • Figure 3 represents schematically the well driller machine 20 on which the drilling string 10 is applied and comprising an aspiration group (7, 8), better described below.
  • the rotation direction of the arrow indicates the rotational direction of the drilling string 10 in such a way as to drill the ground.
  • the double direction of the arrows vertical to the ground indicate instead a lifting/lowering direction of the tube to execute the drilling and lifting from the ground.
  • the drilling string 10 allows the aspiration of the fluid and is connected to a flexible waste pipe of the detritus in the tanks.
  • an initial perforation phase is represented in which the rock-bit initiates its drilling of the ground in a substantially concentric manner to the old well casing 2.
  • figure 4 shows only a part of the overall length of the old well.
  • the circular crown 11 is highlighted, of diameter D and with perimeter 11', realized concentrically to the well.
  • the figure highlights well how the aggregate material (16, 17) during all the perforation phase results entirely arranged into the said diameter D . In such a manner, by increasing the diameter D in proportion to the width of are of the aggregate, the enhancement of the manoeuvrability of the device will be obtained.
  • always figure 4 highlights the crown of material 9 that surrounds the well and detached from the utensil due to its grazing penetration in the well.
  • the crown 9 results interposed between the cylindrical wall of the rotating tube 4 and the cylindrical wall of the well casing 2.
  • Always figure 4 shows the remaining part of aggregate, which is intact because it has not been reached by the rock-bit yet.
  • a fluid flow for washing is injected by gravity into the crown 11 in such a way as to clean all the existing detritus, included the removal of the said crown 9.
  • the movement of the fluid for example water
  • the fluid for example water
  • reverse circulation is caused through the said aspiration system (7, 8) comprising a centrifuge pump 8 with decompressor or more efficiently with a compressor of suitable capacity.
  • the descending fluid delivery by gravity through the crown 11 is aspirated, for rising, along the conduit formed by the tube 4. In such a manner, always as shown in figure 4 , all the residues mixed with the fluid are aspirated during the digging.
  • a collection container 12 is arranged on top of the well before the beginning of the digging operations. In such a manner, the most part of the material is aspirated while the excessively heavy macroscopic particles, which are not able to be dragged by the flow, are impeded from falling to the bottom of the well.
  • Figure 5 represents an intermediate digging phase in which the rock-bit is about to reach the bottom of the well while, at the same time, continues the fluid delivery and the aspiration. Always figure 5 shows some heavy detritus fallen into the container 12.
  • Figure 6 represents the conclusive digging phase in which the utensil reaches the bottom of the well to the quote h below old filters. The fluid delivery continues until the entire hole and the aggregate material has been substantially removed completely.
  • the subsequent figure 7 represents the digging phase of the old well once the washing phase is completed. At this point, a circumference of diameter D is obtained completely free from any form of detritus.
  • the reconstruction of the new well can now be carried out with the insertion of the new well casing 30, of the filters 31 and the laying of the gravel pack for the new drainage layer 34, together with the new cementing 35.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
EP10425119A 2010-04-14 2010-04-14 Verfahren zur Rekonstruktion von Brunnen durch Entfernung der alten Verkleidung mittels einer einzigen Gegenstromperforation und zugehörige Vorrichtung Withdrawn EP2378055A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10425119A EP2378055A1 (de) 2010-04-14 2010-04-14 Verfahren zur Rekonstruktion von Brunnen durch Entfernung der alten Verkleidung mittels einer einzigen Gegenstromperforation und zugehörige Vorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10425119A EP2378055A1 (de) 2010-04-14 2010-04-14 Verfahren zur Rekonstruktion von Brunnen durch Entfernung der alten Verkleidung mittels einer einzigen Gegenstromperforation und zugehörige Vorrichtung

Publications (1)

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EP2378055A1 true EP2378055A1 (de) 2011-10-19

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EP10425119A Withdrawn EP2378055A1 (de) 2010-04-14 2010-04-14 Verfahren zur Rekonstruktion von Brunnen durch Entfernung der alten Verkleidung mittels einer einzigen Gegenstromperforation und zugehörige Vorrichtung

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827264A (en) * 1954-08-04 1958-03-18 Hugh W Sitton Drilling tool
US3169590A (en) * 1961-02-28 1965-02-16 Ideas Inc Apparatus for drilling large diameter holes
US3217816A (en) * 1964-12-10 1965-11-16 Louis B Boyer Method of removing pipe
US3910361A (en) * 1972-11-15 1975-10-07 Boehler & Co Ag Geb Apparatus for drilling and enlarging a bore
FR2504168A1 (fr) * 1981-04-17 1982-10-22 Fondedile Spa Procede pour l'execution dans le terrain d'ouvrages annulaires pour des destinations diverses telles que la construction de pieux de fondation a noyau creux; equipement pour l'execution dudit procede et structures obtenues
US5823275A (en) * 1997-01-16 1998-10-20 Ku; Chun-Yi High-speed drill for rock stake engineering
JP2004132035A (ja) * 2002-10-10 2004-04-30 Jukankyo Sekkeishitsu:Kk 既存埋設柱体の引抜き用ケーシングヘッド

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827264A (en) * 1954-08-04 1958-03-18 Hugh W Sitton Drilling tool
US3169590A (en) * 1961-02-28 1965-02-16 Ideas Inc Apparatus for drilling large diameter holes
US3217816A (en) * 1964-12-10 1965-11-16 Louis B Boyer Method of removing pipe
US3910361A (en) * 1972-11-15 1975-10-07 Boehler & Co Ag Geb Apparatus for drilling and enlarging a bore
FR2504168A1 (fr) * 1981-04-17 1982-10-22 Fondedile Spa Procede pour l'execution dans le terrain d'ouvrages annulaires pour des destinations diverses telles que la construction de pieux de fondation a noyau creux; equipement pour l'execution dudit procede et structures obtenues
US5823275A (en) * 1997-01-16 1998-10-20 Ku; Chun-Yi High-speed drill for rock stake engineering
JP2004132035A (ja) * 2002-10-10 2004-04-30 Jukankyo Sekkeishitsu:Kk 既存埋設柱体の引抜き用ケーシングヘッド

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