EP4368809B1 - Spülvorrichtung, insbesondere zum einbau in einen bohrstrang - Google Patents

Spülvorrichtung, insbesondere zum einbau in einen bohrstrang Download PDF

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Publication number
EP4368809B1
EP4368809B1 EP22206595.5A EP22206595A EP4368809B1 EP 4368809 B1 EP4368809 B1 EP 4368809B1 EP 22206595 A EP22206595 A EP 22206595A EP 4368809 B1 EP4368809 B1 EP 4368809B1
Authority
EP
European Patent Office
Prior art keywords
flushing device
nozzle
recesses
base body
fluid flow
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.)
Active
Application number
EP22206595.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP4368809A1 (de
EP4368809C0 (de
Inventor
Ernst Fengler
Rainer Hemken
Peter Rubarth
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.)
LMR Drilling GmbH
Original Assignee
LMR Drilling GmbH
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
Priority to ES22206595T priority Critical patent/ES3020060T3/es
Priority to EP22206595.5A priority patent/EP4368809B1/de
Priority to RS20250319A priority patent/RS66636B1/sr
Priority to PL22206595.5T priority patent/PL4368809T3/pl
Priority to HUE22206595A priority patent/HUE070608T2/hu
Application filed by LMR Drilling GmbH filed Critical LMR Drilling GmbH
Priority to HRP20250348TT priority patent/HRP20250348T1/hr
Publication of EP4368809A1 publication Critical patent/EP4368809A1/de
Application granted granted Critical
Publication of EP4368809C0 publication Critical patent/EP4368809C0/de
Publication of EP4368809B1 publication Critical patent/EP4368809B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
    • 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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0078—Nozzles used in 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
    • 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 invention relates to a flushing device, in particular for installation in a drill string which is designed to create boreholes in the ground, wherein the flushing device is intended for installation behind a drill bit of the drill string.
  • the invention also relates to a method for flushing ground.
  • pipes can be laid underground by digging trenches, laying the pipes in the trenches and, once the pipes are finished, filling the trenches with soil.
  • This type of earthwork is time-consuming, labor-intensive and therefore costly. Particular problems arise with this type of earthwork when pipes are to be laid beneath obstacles.
  • Horizontal drilling methods such as the horizontal directional drilling method
  • trenchless installation methods with which a pipeline can be laid without having to dig a trench.
  • a borehole can be initially drilled diagonally into the ground using a horizontal drilling device until the desired depth is reached in order to guide the pipeline safely underneath an obstacle.
  • a horizontal directional drilling system for example, a pilot hole is drilled in the direction of the target point using a drill head.
  • the drill head can be screwed to a drill rod and thus form the drill string.
  • the drill rod can have a smaller diameter than the drill head, so that an annular space is left between the drill rod and the ground.
  • a drilling fluid can be pumped through the rod to the drill head. where it exits and flushes the soil loosened by the drill head through the annular space.
  • the US 4 583 603 A describes a drill string joint for insertion into a drill string comprising a body having an axial bore therethrough.
  • the body has generally cylindrical upper and lower sections and a widened cylindrical intermediate section.
  • At the upper end of the intermediate section there are formed at least three cutouts for insertion of removable fasteners, each provided with an upwardly directed internal passage connecting the bore to a replaceable nozzle mounted at the upper end of the passage and having a diameter between the outer diameter of the intermediate section and that of the upper section of the body.
  • An expansion device for carrying out the method has a cylindrical housing with a front expansion head and a drive device for forward movement in the soil, as well as a device for connecting and pulling pipes into the expanded borehole.
  • the drive device is designed as an impact device, which has an impact body that impacts on the front inside the housing, and has a cylindrical housing length that is shorter than four times the housing diameter.
  • the expansion head for receiving part of the impact device is designed as a hollow head and can be connected to a cutting device, which has means for the discharge of cutting fluid at high pressure, preferably cutting nozzles.
  • the DE 10 2015 003157 A1 shows a drill string element for installation in a drill string, in particular for horizontal or slant directional drilling (HDD or SDD), for creating a borehole along a drilling route, in particular for laying a pipeline, with a tubular base body with connecting elements on both sides for connecting the drill string element to the drill string.
  • the drill string element has an interior space through which a flushing medium for flushing the borehole and for removing cuttings released by a drill head connected to the drill string can be transported.
  • At least one opening connected to the interior space is arranged, through which at least part of the flushing medium flowing through the interior reaches an annular space between the borehole wall and the base body.
  • At least one body is arranged on the outer wall above the opening, in which a flow channel is arranged at least partially.
  • the flow channel has at least one flow path and is fluidically connected to the opening via an inlet opening.
  • the flow channel has at least one outlet opening on its side facing away from the opening and the clear cross-section of the opening and/or inlet opening is smaller or larger than the clear cross-section of the outlet opening.
  • the invention is based on the object of proposing a device with which the return flow of the drilling fluid through the annular space of the borehole can be improved. Furthermore, the device should contribute to the expansion of the borehole.
  • a flushing device in particular for installation in a drill string, which is designed to drill holes in the ground, wherein the Flushing device is provided for installation behind a drill head of the drill string, wherein the flushing device has a tubular base body, wherein the flushing device has at least one nozzle body for dispensing at least one fluid, wherein the base body has recesses for receiving the at least one nozzle body, wherein the at least one nozzle body is detachably connected to the base body, wherein the base body has an at least substantially cylindrical middle part, wherein conically tapering regions adjoin the middle part on both sides, it is provided essential to the invention that the recesses are arranged on both sides of the middle part in the conically tapering regions.
  • the flushing device is provided for installation in a drill string, wherein the drill string can consist of a drill rod, which can be composed of several drill rods, and at least one drill head, which can be formed by a drill bit, for example.
  • the drill bit can be, for example, a pilot bit, in particular a roller bit.
  • the flushing device is installed in the drill string at a distance from the drill head. The distance between the flushing device and the drill head can be adjusted depending on the application.
  • the flushing device has a base body in which recesses are arranged, in each of which at least one nozzle body can be accommodated.
  • the base body has several recesses, with a nozzle body preferably being accommodated in each recess.
  • the nozzle bodies are each detachably accommodated in the recesses so that the nozzle bodies are exchangeable.
  • the nozzle bodies can be connected to the respective recess by screw connections.
  • the nozzle bodies each have at least one nozzle opening through which a fluid, in particular the drilling fluid solution, can be released into the annular space between the drill rod and the soil.
  • the fluid is guided through the tubular drill rods to the drill head and the flushing device.
  • At least a fluid-conducting pipeline is formed in sections.
  • the flushing device has connectors arranged at the ends on both sides for connection to the drill rod.
  • the connectors can have threads.
  • the nozzle openings are connected in a fluid-conducting manner to fluid openings in the recesses of the base body.
  • the fluid passes through the drill rod into the base body of the flushing device and through the fluid openings in the recesses of the base body to the nozzle openings of the nozzle bodies. If no nozzle body is accommodated in a recess, the respective fluid opening can be closed with a blind plug.
  • a fixed radiation angle is specified by the nozzle opening. The fluid can thus be emitted through the nozzle body at a flatter or steeper angle to the longitudinal extension of the drill rod, in particular to its longitudinal axis of symmetry.
  • the fluid flow through the nozzle body can also be directed essentially in the direction of advance or against the direction of advance of the drill string.
  • the direction of advance is the direction in which the drill string is moved through the soil to create the borehole.
  • the nozzle bodies and the fluid released by the nozzle bodies allow the soil loosened by a drill bit to be flushed out of the borehole through the annular space. In particular, this is also possible over a longer distance, in particular over 1,000 meters, thanks to the supporting nozzles, without the flushing flow coming to a standstill.
  • the middle part of the base body is essentially hollow-cylindrical.
  • the base body is essentially mirror-symmetrical. On both sides of the middle part there are conically tapered areas that reduce the diameter of the middle part to a smaller diameter.
  • the conically tapered areas form ring surfaces in which the recesses are arranged at least in sections.
  • the nozzle bodies can thus be accommodated by the base body on both sides of the middle part. This means that In particular, fluid flows in the direction of advance of the drill string and in the opposite direction are possible.
  • the nozzle bodies each have at least one nozzle opening and the jet angle of the fluid is predetermined by the nozzle bodies.
  • the nozzle bodies are detachably connected to the recesses in the base body.
  • the nozzle bodies are thus interchangeable, so that different nozzle bodies with different jet angles of the fluid in relation to the longitudinal extension of the drill string can be used.
  • the fluid can be jetted at a steep angle to the longitudinal extension of the base body so that the fluid flow is directed more in the direction of the surrounding soil, or the fluid can be guided at a shallow angle along the annular space.
  • the flushing device can thus be set up to expand the borehole and thus the annular space more, or the flushing device can be more geared towards flushing the flushing flow of the loosened earth material through the annular space.
  • the base body is rotationally symmetrical.
  • the base body of the flushing device can be rotationally symmetrical, for example, hollow-cylindrical, so that the recesses for receiving the nozzle bodies can be distributed along the circumference. This allows the fluid flow to be generated along the entire circumference of the base body in the annular space between the drill string and the ground.
  • the recesses are evenly distributed along the circumference of the base body.
  • the distribution of the recesses and thus the nozzle body enables a uniform generation of a fluid flow in the annular space around the flushing device.
  • the recesses are arranged in the tapered ring surfaces of the tapered regions and the recesses are laterally delimited by tapered side walls.
  • the recesses are arranged in the tapered regions in such a way that their longitudinal extension runs essentially parallel to the longitudinal extension of the base body.
  • the recesses are each delimited on two parallel sides by tapered side walls.
  • Tapered webs are formed between the side walls of two adjacent recesses, which form the ring surface.
  • the nozzle bodies accommodated in the recesses can in particular be accommodated flush in the recesses so that they are flush with the circumference of the central part.
  • the conical ring surfaces each have eight recesses.
  • the tapered areas on the sides of the middle part can each have eight recesses, so that the base body has a total of 16 recesses for receiving nozzle bodies.
  • the middle part has a larger diameter than the other areas of the flushing device.
  • the other areas of the flushing device can be, for example, connecting pieces for the rods of the drill string, so that it can be installed in the drill string.
  • the diameter of the middle part is preferably smaller than the diameter of the hole created by the drill bit.
  • nozzle bodies with different angles of attack can be accommodated in the recesses. Because different nozzle bodies with different angles of attack of the nozzle openings can be accommodated in the recesses, the Flushing device can be adapted to different purposes. For example, nozzle bodies with steep angles of attack can be used to enlarge a borehole, while nozzle bodies with flatter angles of attack can be used to extend the length of the base body to improve the return flow through the annulus.
  • the nozzle openings in a first ring surface are directed essentially in the direction of the advance direction of the drill string and the nozzle openings of a second ring surface are directed essentially against the advance direction of the drill string.
  • the nozzle openings of the nozzle bodies in a first conical region as seen from the drill head can be directed in the direction of the advance direction of the drill string, while the nozzle openings arranged in a second conical region arranged behind the middle part as seen from the drill head can be directed against the advance direction.
  • the nozzle bodies arranged in the second conical region thus support a fluid flow through the annular space in the direction of the starting point of the bore.
  • a further aspect of the invention relates to a method for flushing soil with a flushing device according to the invention, wherein the fluid flow guided through the nozzles is guided both essentially in the direction of the drilling advance and essentially against the direction of the drilling advance.
  • the flushing device according to the invention with nozzle bodies accommodated in the recesses of the base body can be used for flushing soils.
  • the flushing device when installed in a drill string with a drill bit, can be used to direct a fluid flow, in particular a flow of drilling fluid, towards the inlet side of the drill string. support.
  • the flushing device transports the sediment loosened by the drill bit in the direction of the inlet opening.
  • the flushing device can also be used in a drill string to enlarge the diameter of the borehole, i.e. the annular space.
  • nozzles with a large beam angle to the longitudinal extent of the drill string can be selected.
  • the pressure conditions in the annular space can be adjusted, in particular the annular space pressure can be reduced and the occurrence of blowouts can be minimized.
  • a drill hole can also be dammed or cemented by pumping appropriate fluids. This is particularly favored due to the modular design with exchangeable nozzle bodies, as the nozzle bodies can be easily cleaned or replaced.
  • the flushing device can also be used to cause artificial borehole collapses.
  • the filter cake on a borehole wall can be softened or dissolved, so that the borehole becomes unstable.
  • a high input of drilling fluid or water under high pressure can be used at specific points. The resulting unstable caverns then tend to collapse.
  • the flushing device makes it possible to flush obstacles free when it is used as a single tool and not installed in a drill string. Obstacles that are arranged underground at least in sections can be flushed free by means of a fluid flushing stream through nozzles that are set up, without having to come into direct contact with the obstacles.
  • a borehole is created by means of the method, wherein a substantially horizontal borehole is made in the ground by means of at least one drilling device having a drill rod and a drill bit, wherein a drilling fluid flow is generated by the drill bit, wherein the drilling device Flushing device, wherein at least one fluid is passed through the nozzles of the flushing device and thus a fluid flow is generated, wherein the fluid flow passed through the nozzles supports a backflow of a drilling fluid flow in the annular space of the borehole.
  • the drilling device for creating the borehole has a flushing device according to the invention.
  • a fluid is passed through the flushing device, wherein the direction of the fluid flow is predetermined by the angle of attack of the nozzle openings of the nozzle bodies. Since the fluid flow can be directed both opposite to the direction of advance of the drill string and in the direction of advance of the drill string, the drilling fluid backflow can be supported by the fluid flow generated.
  • the method for creating a borehole can be a drilling fluid method.
  • the drilling fluid backflow can be stabilized by enlarging the borehole, so that bore lengths of over 1,000 meters can also be achieved.
  • the use of the flushing device optimizes the cleaning of the borehole, since the return flow of the drilling fluid stream is mainly generated by the flushing device and not by the flushing fluid exiting the pilot bit.
  • the diameter of the borehole is increased by the fluid stream passed through the nozzles.
  • the borehole created can be significantly enlarged by the additional flushing flow introduced by the flushing device and by the angle of attack of the nozzles.
  • the borehole area flushed out with the flushing device can be several times the size of the pilot drilling area.
  • the annular space pressure can be significantly reduced compared to conventional methods and thus the risk of blowouts can be minimized.
  • the fluid flow directed through the nozzles flushes away obstacles that are at least partially underground.
  • the fluid flow generated by the flushing device can flush away objects, for example obstacles that are at least partially underground.
  • the nozzles in position generate a flushing flow with a corresponding radial range that is able to flush away obstacles without coming into direct contact with them.
  • a flushing device 1 with a central part 2 and two connecting pieces 3 and 4 is shown in a perspective view.
  • the central part 2 of the flushing device 1 is essentially hollow-cylindrical. Conically tapered areas 5, 6 adjoin the central part 2. Recesses 7 are arranged in the conical areas 5, 6, which are designed to accommodate nozzle bodies 8.
  • the connecting pieces 3, 4, the flushing device 1 can be installed in the pipe rod of a drill string 14.
  • the nozzle bodies 8 have nozzle openings 9, each of which has a fixed angle of attack to the longitudinal extension of the base body 10 of the flushing device 1.
  • a fluid flow can be generated through the nozzle openings 9, which is directed depending on the angle of attack of the nozzle openings 9.
  • the nozzle openings 9 are connected to the base body 10 via screw connections 11, so that the nozzle bodies 8 are exchangeable and thus nozzle bodies 8 with other angles of attack of the nozzle opening 9 can also be installed.
  • Fig. 2 is a side view of the flushing device 1 according to Fig. 1 Identical components are provided with the same reference numerals.
  • the conical regions 5, 6 can each, for example, span an angle of 160° with the longitudinal axis of symmetry of the base body 10.
  • the nozzle openings 9 of the nozzle bodies 8 of a first conical region 5 can be directed in the direction of the advance movement of the drilling passage, while the nozzle bodies in the conical region 6 generate a fluid flow opposite to the direction of movement.
  • the fluid flow through the nozzle bodies 8 of the first conical region 5 is thus directed in the direction of the drill head 15, the fluid flow of the nozzle bodies 8 in the conical region 6 is directed away from the drill head 15.
  • Fig. 3 is a cross section of the flushing device 1 according to Fig. 2 along the section A - A.
  • the recesses 7 are evenly distributed along the circumference of the base body 10.
  • Fig. 4 is a longitudinal section at position B - B of the base body 10 according to Fig. 2
  • the base body 10 has a continuous pipe 12 in its interior, through which a flushing fluid can be guided in the direction of the drill head 15.
  • the base body 10 has fluid openings 13 through which the fluid to be pumped can reach the nozzle bodies 8 and through the nozzle openings 9.
  • FIG. 5 The installation of a flushing device 1 in a drill string 14 with a drill head 15 is shown schematically.
  • the flushing device 1 is arranged at a distance from the drill head 15, which can be designed as a drill bit, in order not to influence the function of the drill head 15, for example a control probe.

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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)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
EP22206595.5A 2022-11-10 2022-11-10 Spülvorrichtung, insbesondere zum einbau in einen bohrstrang Active EP4368809B1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP22206595.5A EP4368809B1 (de) 2022-11-10 2022-11-10 Spülvorrichtung, insbesondere zum einbau in einen bohrstrang
RS20250319A RS66636B1 (sr) 2022-11-10 2022-11-10 Uređaj za ispiranјe, naročito za instalaciju u kolonu bušaćeg alata
PL22206595.5T PL4368809T3 (pl) 2022-11-10 2022-11-10 Urządzenie płuczące, zwłaszcza do montażu w przewodzie wiertniczym
HUE22206595A HUE070608T2 (hu) 2022-11-10 2022-11-10 Öblítõszerkezet, különösen egy fúrószárba való beépítésre
ES22206595T ES3020060T3 (en) 2022-11-10 2022-11-10 Flushing device, in particular for installation in a drill string
HRP20250348TT HRP20250348T1 (hr) 2022-11-10 2022-11-10 Uređaj za ispiranje, posebno za ugradnju u bušilice

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22206595.5A EP4368809B1 (de) 2022-11-10 2022-11-10 Spülvorrichtung, insbesondere zum einbau in einen bohrstrang

Publications (3)

Publication Number Publication Date
EP4368809A1 EP4368809A1 (de) 2024-05-15
EP4368809C0 EP4368809C0 (de) 2025-01-01
EP4368809B1 true EP4368809B1 (de) 2025-01-01

Family

ID=84331157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22206595.5A Active EP4368809B1 (de) 2022-11-10 2022-11-10 Spülvorrichtung, insbesondere zum einbau in einen bohrstrang

Country Status (6)

Country Link
EP (1) EP4368809B1 (es)
ES (1) ES3020060T3 (es)
HR (1) HRP20250348T1 (es)
HU (1) HUE070608T2 (es)
PL (1) PL4368809T3 (es)
RS (1) RS66636B1 (es)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568935B1 (fr) * 1984-08-08 1986-09-05 Petroles Cie Francaise Raccord de garniture de forage, notamment pour la traversee d'une zone a perte de circulation
CH683016A5 (de) * 1990-12-24 1993-12-31 Terra Ag Tiefbautechnik Verfahren zum Aufweiten eines Bohrloches und Aufweitgerät.
DE102015003157A1 (de) * 2015-03-15 2016-09-15 Herrenknecht Ag Bohrstrangelement

Also Published As

Publication number Publication date
RS66636B1 (sr) 2025-04-30
PL4368809T3 (pl) 2025-08-04
HRP20250348T1 (hr) 2025-05-09
EP4368809A1 (de) 2024-05-15
HUE070608T2 (hu) 2025-06-28
ES3020060T3 (en) 2025-05-21
EP4368809C0 (de) 2025-01-01

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