EP0290938A2 - Device for generating pressure pulses in a drilling fluid - Google Patents

Device for generating pressure pulses in a drilling fluid Download PDF

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Publication number
EP0290938A2
EP0290938A2 EP88107134A EP88107134A EP0290938A2 EP 0290938 A2 EP0290938 A2 EP 0290938A2 EP 88107134 A EP88107134 A EP 88107134A EP 88107134 A EP88107134 A EP 88107134A EP 0290938 A2 EP0290938 A2 EP 0290938A2
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EP
European Patent Office
Prior art keywords
valve body
main valve
gap
throttle section
drilling fluid
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Withdrawn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
EP88107134A
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German (de)
French (fr)
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EP0290938A3 (en
Inventor
Rainer Dipl.-Ing. Jürgens
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Baker Hughes Oilfield Operations LLC
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Eastman Christensen Co
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Publication date
Application filed by Eastman Christensen Co filed Critical Eastman Christensen Co
Publication of EP0290938A2 publication Critical patent/EP0290938A2/en
Publication of EP0290938A3 publication Critical patent/EP0290938A3/en
Withdrawn legal-status Critical Current

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    • 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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
    • E21B47/18—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
    • E21B47/24—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry by positive mud pulses using a flow restricting valve within the drill pipe

Definitions

  • the invention relates to a device for generating pressure pulses in a drilling fluid flowing down a drill pipe string in a configuration according to the preamble of claim 1.
  • contact seals in particular O-ring seals, are provided in the overlap area between the main valve body and the carrier body in order to completely prevent passage of drilling fluid between the main valve body and the carrier body .
  • O-ring seals are provided in the overlap area between the main valve body and the carrier body in order to completely prevent passage of drilling fluid between the main valve body and the carrier body .
  • the contact seals form dead water zones in the overlap area, in which solid particles carried by the drilling fluid are deposited. Such sedimentation can cause resistance to movement on the main venticor after a short time per exercise, which ultimately result in a complete fixing. With increasing resistance to movement, there are changes in the shape and height of the pressure pulses caused by the movements of the main valve body in the drilling fluid, with the result that the signals cannot be recognized or can no longer be recognized correctly.
  • the invention has for its object to provide a device of the type mentioned, which effectively prevents the development of resistance to movement on the main valve body as a result of sediment formation.
  • the invention solves this problem based on a device according to the preamble of claim 1 with the features of the characterizing part of this claim. With regard to further refinements, reference is made to claims 2 to 10.
  • Leaving a gap between the main valve body and the carrier body through which the drilling fluid can flow completely avoids the formation of dead water zones and thus the formation of sediment, so that even after a long period of operation the operating conditions for the main valve body remain unchanged and are determined exclusively by the hydraulic pressure conditions.
  • the formation of the gap in the overlap area as a narrow throttle plug nevertheless ensures the occurrence of clearly predeterminable pressure conditions in the internal flow channel, while at the same time ensuring that the angle of a theoretically conceivable tilting movement of the main valve body relative to the carrier body is small and counteracts clamping phenomena.
  • the gap in the overlap region preferably forms two throttle sections located one behind the other at a distance, the gap of the gap adjoining the throttle sections in the overlap region having a substantially larger gap width.
  • the gap in the region of the throttle section is preferably delimited at least on one side by a surface forming the armor surface, as a result of which the life of the parts exposed to the abrasive action of the drilling fluid is increased and the wear-related expansion of the gap in the region of the throttle section is delayed.
  • the device for generating pressure pulses in a drilling fluid flowing down a drill pipe string 1 downwards in the direction of an arrow 2 - which flows out again after exiting through a rotary drill bit at the end of the drill pipe string into the borehole in the annular space between its wall and the outer wall of the drill pipe string - exists from a valve arranged in the drill pipe string 1, which comprises an outer part 3, a main valve body 4 and a carrier body 5.
  • the substantially tubular outer part 3, which is supported in a stationary manner in the drill pipe string 1, comprises an upper ring part 6 with a central axial passage opening 7, the cross section of which is substantially smaller than the cross section in the drill pipe string 1 above the valve. Furthermore, the outer part 3 supports the foot part 8 of the support part 5 in a fixed manner in its lower region, which in its central region 9 is designed to be closed except for an axial through opening 10, but between the and the inside of the outer part 3, however, pass-through openings distributed over the circumference for the Drilling fluid remain, which flows downward through the annular outer flow channel 11 between the outer part 3 and the main valve body 4.
  • the foot part 8 forms an integral (or also separate) part of the carrier body 5, which in its Main part is essentially tubular and has a central through opening 12. This continues in the through opening 10, which has a valve seat 13 at its lower end. This valve seat also forms the outlet opening of an internal flow channel which is delimited in its lower region by the axial through openings 12, 10.
  • An auxiliary valve body 14 is assigned to the valve seat or the outlet opening 13 and is actuated by a drive 15, e.g. of an electromagnet, can be moved upward from its illustrated open position into a closed position, in which it closes the outlet opening 13.
  • a drive 15 e.g. of an electromagnet
  • the carrier body 5 is cylindrical in the area of the outer surface 16 of its main part 17 and defines with this cylindrical outer surface 16 an annular gap 18 which is delimited on the outside by a cylindrical surface 19 of a tubular extension part 20 of the main valve body 4.
  • the surfaces 16, 19 opposite one another in the starting position of the main valve body 4 over their entire length define an overlap area between the main valve body 4 and the carrier body 5, the length of which decreases as soon as the main valve body 4 moves upwards in the direction of the ring part 6 executes.
  • the main valve body 4 has an upper end part 22, which is closed except for a through opening 21, which has a conical surface 23 and merges into a tubular extension 24 in its central region.
  • this offers side openings 25 located in the ring part 6 at the level of the passage opening 7, which side openings 25 are connected to the passage opening 21 stand.
  • These side openings 25 form the inlet opening for the inner flow channel surrounded in its upper region by the through opening 21 and then continued by the through openings 12, 10.
  • the extension 24 is closed at its front end 26 and in this way forms a kind of pitot tube.
  • the external flow channel 11 forms a throttle section 28, the flow cross section of which depends on the position of the main valve body 4.
  • the drilling fluid medium can flow freely through the gap 18 between the main valve body 4 and the carrier body 5 and is flowed through by drilling fluid in all positions of the main valve body 4 relative to the carrier body 5 due to a pressure gradient between the drilling fluid in the through opening 12 and in the external flow channel 11.
  • the gap 18 forms a narrow throttling section, namely in that the width of the gap 18 in the area of the throttling section has a width which is less than a 100th of the diameter of the annular gap 18 and preferably in Range between 0.05 and 0.5 mm, preferably 0.15 mm.
  • the gap 18 has a gap width which is constant over its length in the region of the throttle section.
  • the throttle section can extend essentially over the entire length of the overlap region between the main valve body 4 and the carrier body 5, as shown in FIG. 4, in which the throttle section of the Column is designated 29.
  • the gap 18 in the overlap region can also form two (or more) throttle sections 30 which are spaced one behind the other, as is shown schematically in FIGS. 2 and 3.
  • the gap 18 has a much larger gap width in the areas adjacent to the throttle sections 30, as is also illustrated in FIGS. 2 and 3.
  • the armor 31 can be designed as an application layer, as shown in FIG. 2, or of sleeve parts 32 that are attached or inserted, which are indicated by dashed lines in FIGS. 3 and 4.
  • Tungsten carbide is preferably used as the material for the armor.
  • any other valve can also be used, provided that it is provided with a main valve body, which is arranged coaxially in an outer part and has a carrier body as a support and guide element, and the latter two define an overlap area with a cylindrical gap.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geophysics (AREA)
  • Acoustics & Sound (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Lift Valve (AREA)
  • Earth Drilling (AREA)
  • Details Of Valves (AREA)

Abstract

A device for generating pressure pulses in a drilling fluid flowing down through a drill-pipe string (1) comprises a valve arranged in the drill-pipe string (1) and having an axially displaceable, tubular main valve body (4), a fixed, tubular support body (5) which is arranged coaxially in the main valve body (4) and in the overlapping area with the main valve body (4) defines with the latter a cylindrical gap (18), and an auxiliary valve (13, 14) which can be actuated by means of a drive (15). The outer part (3) and the main valve body (4) define between them a restriction section (28) with a cross-section of flow which can be varied as a function of the position of the main valve body (4), and the main valve body (4) and the support body (5) surround an inner flow passage (21, 12, 10) whose inlet opening (25) is provided centrally in the end part (22) of the main valve body (4) and whose outlet opening (13) is arranged centrally on the bottom closed base part (8) of the support body (5) and can be cleared and closed by means of the auxiliary valve body (14). In this arrangement, drilling fluid can flow freely through the gap (18) between the main valve body (4) and the support body (5), and the gap (18) forms a narrow restriction section (29; 30) in the overlapping area.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Er­zeugung von Druckpulsen in einem einen bohrrohstrang abwärts durchströmenden Bohrungspülungsmedium in einer Ausbildung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for generating pressure pulses in a drilling fluid flowing down a drill pipe string in a configuration according to the preamble of claim 1.

Bei derartigen Vorrichtungen wie sie beispielsweise die US-PS 3 958 217 veranschaulicht, sind im Überlappungsbe­reich zwischen dem Hauptventilkörper und dem Trägerkö­per Berührungsdichtungen, insbesondere O-Ring-Dichtun­gen, vorgesehen, um einen Durchtritt von Bohrspülungsme­dium zwischen dem Hauptventilkörper und dem Trägerkörper hindurch vollständig zu unterbinden. Zugleich damit ist sichergestellt, daß im Innenströmungskanal kein Druckab­fall eintritt, wenn zur Auslösung einer druckpulserzeu­genden Bewegung des Hauptventilkörpers das Hilfsventil­betätigt und dadurch die Austrittsöffnung des Innenströ­mungskanals verschlossen wird.In such devices as illustrated, for example, in US Pat. No. 3,958,217, contact seals, in particular O-ring seals, are provided in the overlap area between the main valve body and the carrier body in order to completely prevent passage of drilling fluid between the main valve body and the carrier body . At the same time, it is ensured that no pressure drop occurs in the inner flow channel when the auxiliary valve is actuated to trigger a pressure pulse-generating movement of the main valve body and the outlet opening of the inner flow channel is thereby closed.

Durch die Berührungsdichtungen werden jedoch im Über­lappungsbereich Totwasserzonen gebildet, in denen sich vom Bohrspülungsmedium mitgeführte Feststoffpartikel ablagern. Derartige Sedimentierungen können schon nach kurzer Zeit Bewegungswiderstände auf den Hauptventikör­ per ausüben, die schließlich ein vollständiges Fest­setzen zur Folge haben. Mit wachsenden Bewegungswider­ständen ergeben sich Veränderungen in Form und Höhe der durch die Bewegungen des Hauptventilkörpers im Bohr­spülungsmedium hervorgerufenen Druckpulse mit der Folge, daß die Signale nicht oder nicht mehr richtig erkennbar sind.The contact seals, however, form dead water zones in the overlap area, in which solid particles carried by the drilling fluid are deposited. Such sedimentation can cause resistance to movement on the main venticor after a short time per exercise, which ultimately result in a complete fixing. With increasing resistance to movement, there are changes in the shape and height of the pressure pulses caused by the movements of the main valve body in the drilling fluid, with the result that the signals cannot be recognized or can no longer be recognized correctly.

Der Erfindung leigt die Aufgabe zugrunde, eine Vorrich­tung der eingangs genannten Art zu schaffen, die das Entstehen von Bewegungswiderständen auf den Hauptventil­körper als Folge von Sedimentbildungen wirksam verhin­dert. Die Erfindung löst diese Aufgabe ausgehend von einer Vorrichtung nach dem Oberbegriff des Anspruchs 1 mit den Merkmalen des kennzeichnenden Teils dieses An­spruchs. Hinsichtlich weiterer Ausgestaltungen wird auf die Ansprüche 2 bis 10 verwiesen.The invention has for its object to provide a device of the type mentioned, which effectively prevents the development of resistance to movement on the main valve body as a result of sediment formation. The invention solves this problem based on a device according to the preamble of claim 1 with the features of the characterizing part of this claim. With regard to further refinements, reference is made to claims 2 to 10.

Die Belassung eines vollständig vom Bohrspülungsmedium durchströmbaren Spaltes zwischen dem Hauptventilkörper und dem Trägerkörper vermeidet die Bildung von Totwas­serzonen und damit das Auftreten von Sedimentbildung, so daß auch nach langer Betriebszeit die Betriebsbedingun­gen für den Hauptventilkörper unverändert bleiben und ausschließlich durch die hydraulischen Druckverhältnisse bestimmt werden. Die Ausbildung des Spaltes im Über­lappungsbereich als enge Drosselstecke stellt dennoch das Auftreten von eindeutig vorbestimmbaren Druckver­hältnissen im Innenströmungskanal sicher, während gleichzeitig sichergestellt ist, daß der Winkel einer theoretisch denkbaren Kippbewegung des Hauptventilkör­pers relativ zum Trägerkörper klein ist und Klemmer­scheinungen entgegenwirkt.Leaving a gap between the main valve body and the carrier body through which the drilling fluid can flow completely avoids the formation of dead water zones and thus the formation of sediment, so that even after a long period of operation the operating conditions for the main valve body remain unchanged and are determined exclusively by the hydraulic pressure conditions. The formation of the gap in the overlap area as a narrow throttle plug nevertheless ensures the occurrence of clearly predeterminable pressure conditions in the internal flow channel, while at the same time ensuring that the angle of a theoretically conceivable tilting movement of the main valve body relative to the carrier body is small and counteracts clamping phenomena.

Gleichzeitig aber ist auch im Bereich der Drosselstrecke des Spaltes zwischen Außenventilkörper und Trägerkörper sichergestellt, daß die Spaltweite die Partikelgröße von in dem Bohrspülungsmedium mitgeführten Feststoffparti­keln übersteigt, so daß ein Einklemmen von Feststoff­partikeln im Spalt auch im Bereich der Drosselstrecke vermieden ist.But at the same time is also in the area of the throttle section of the gap between the outer valve body and the carrier body ensures that the gap width exceeds the particle size of solid particles carried in the drilling fluid, so that jamming of solid particles in the gap is also avoided in the region of the throttle section.

Beovrzugt bildet der Spalt im Überlappungsbereich zwei im Abstand hintereinander liegende Drosselstrecken, wo­bei in den im Überlappungsbereich an die Drosselstrecken angrezenden Bereichen des Spaltes dieser eine wesent­lich größere Spaltweite hat. Dies mindert die Gefahr eines Verklemmens aufgrund von Kippbewegungen und stellt zugleich sicher, daß die Drosselstrecke unabhängig von der Stellung des Haupventilkörpers relativ zum Träger­körper eine stets gleiche Gesamtlänge hat. Dadurch ist zugleich erreicht, daß die Drosselwirkung auf das Bohr­spülungsmedium in der Drosselstrecke stets gleich ist.The gap in the overlap region preferably forms two throttle sections located one behind the other at a distance, the gap of the gap adjoining the throttle sections in the overlap region having a substantially larger gap width. This reduces the risk of jamming due to tilting movements and at the same time ensures that the throttle section always has the same overall length regardless of the position of the main valve body relative to the carrier body. This also ensures that the throttling effect on the drilling fluid in the throttle section is always the same.

Bevorzugt ist der Spalt im Bereich der Drosselstrecke zumindest einseitig von einer die Oberfläche einer Panzerung bildenden Fläche begrenzt, wodurch die Lebens­dauer der der abrasiven Wirkung des Bohrspülungsmediums ausgesetzten Teile erhöht und das verschleißbedingte Aufweiten des Spaltes im Bereich der Drosselstrecke ver­zögert wird.The gap in the region of the throttle section is preferably delimited at least on one side by a surface forming the armor surface, as a result of which the life of the parts exposed to the abrasive action of the drilling fluid is increased and the wear-related expansion of the gap in the region of the throttle section is delayed.

Weitere Einzelheiten ergeben sich aus der nachfolgenden Beschreibung in Verbindung mit der Zeichnung, in der Ausführungsformen des Gegenstands der Erfindung schema­tisch veranschaulicht sind. In der Zeichnung zeigen:

  • Fig. 1 einen abgebrochenen Längsmittelschnitt durch einen Bohrrohrstrang und eine in diesem ange­ordnete Vorrichtung zur Erzeugung von Druckpul­ sen nach der Erfindung,
  • Fig. 2 bis 4 abgebrochene schematisch Teilschnitte durch den­Überlappungsbereich zwischen Hauptventilkörper und Trägerkörper in Höhe der Kreislinie D in Fig. 1.
Further details emerge from the following description in conjunction with the drawing, in which embodiments of the object of the invention are illustrated schematically. The drawing shows:
  • Fig. 1 shows a broken longitudinal central section through a drill pipe string and a device arranged in this for generating pressure pulse sen according to the invention,
  • 2 to 4 broken away schematic partial sections through the area of overlap between the main valve body and the support body at the level of the circular line D in FIG. 1.

Die Vorrichtung zur Erzeugung von Druckpulsen in einem einen Bohrrohrstrang 1 abwärts in Richtung eines Pfeiles 2 durchströmenden Bohrspülungsmedium - das nach Austre­ten durch einen Drehbohrmeißel am Ende des Bohrrohr­stranges in das Bohrloch im Ringraum zwischen dessen Wandung und der Außenwandung des Bohrrohrstranges wieder aufwärts strömt - besteht im wesentlichen aus einem in dem Bohrrohrstrang 1 angeordneten Ventil, das einen Außenteil 3, einen Hauptventilkörper 4 und einen Träger­körper 5 umfaßt.The device for generating pressure pulses in a drilling fluid flowing down a drill pipe string 1 downwards in the direction of an arrow 2 - which flows out again after exiting through a rotary drill bit at the end of the drill pipe string into the borehole in the annular space between its wall and the outer wall of the drill pipe string - exists from a valve arranged in the drill pipe string 1, which comprises an outer part 3, a main valve body 4 and a carrier body 5.

Der ortsfest im Bohrrohrstrang 1 abgestützte, im wesent­lichen rohrförmige Außenteil 3 umfaßt einen oberen Ringteil 6 mit einer zentralen axialen Durchgangsöffnung 7, deren Querschnitt wesentlich geringer ist als der Querschnitt im Bohrrohrstrang 1 oberhalb des Ventils. Ferner stützt der Außenteil 3 den Fußteil 8 des Träger­teils 5 ortsfest in seinem unteren Bereich ab, der in seinem zentralen Bereich 9 bis auf eine axiale Durch­gangsöffnung 10 geschlossenen ausgeführt ist, zwischen dem und der Innenseite des Außenteils 3 jedoch über den Umfang verteilte Durchtrittsöffnungen für das Bohr­spülungsmedium verbleiben, das den ringförmigen Außen­strömungskanal 11 zwischem dem Außenteil 3 und dem Hauptventilkörper 4 abwärts durchströmt.The substantially tubular outer part 3, which is supported in a stationary manner in the drill pipe string 1, comprises an upper ring part 6 with a central axial passage opening 7, the cross section of which is substantially smaller than the cross section in the drill pipe string 1 above the valve. Furthermore, the outer part 3 supports the foot part 8 of the support part 5 in a fixed manner in its lower region, which in its central region 9 is designed to be closed except for an axial through opening 10, but between the and the inside of the outer part 3, however, pass-through openings distributed over the circumference for the Drilling fluid remain, which flows downward through the annular outer flow channel 11 between the outer part 3 and the main valve body 4.

Der Fußteil 8 bildet einen integralen (oder auch geson­derten) Bestandteil des Trägerkörpers 5, der in seinem Hauptteil im wesentlichen rohrförmig ausgebildet ist und eine zentrale Durchgangsöffnung 12 aufweist. Diese setzt sich in der Durchgangsöffnung 10 fort, die an ihrem un­teren Ende einen Ventilsitz 13 aufweist. Dieser Ventil­sitz bildet zugleich die Austrittsöffnung eines Innen­strömungskanals, der in seinem unteren Bereich von den axialen Durchgangsöffnungen 12,10 umgrenzt ist.The foot part 8 forms an integral (or also separate) part of the carrier body 5, which in its Main part is essentially tubular and has a central through opening 12. This continues in the through opening 10, which has a valve seat 13 at its lower end. This valve seat also forms the outlet opening of an internal flow channel which is delimited in its lower region by the axial through openings 12, 10.

Dem Ventilsitz bzw. der Austrittsöffnung 13 ist ein Hilfsventilkörper 14 zugeordnet, der mittels eines An­triebs 15, z.B. eines Elektromagneten, aus seiner darge­stellten Offenstellung aufwärts in eine Schließstellung bewegbar ist, in der er die Austrittsöffnung 13 ver­schließt.An auxiliary valve body 14 is assigned to the valve seat or the outlet opening 13 and is actuated by a drive 15, e.g. of an electromagnet, can be moved upward from its illustrated open position into a closed position, in which it closes the outlet opening 13.

Der Trägerkörper 5 ist im Bereich der Außenfläche 16 seines Hauptteils 17 zylindrisch ausgebildet und be­grenzt mit dieser zylindrischen Außenfläche 16 einen ringförmigen Spalt 18, der außenseitig von einer ihrer­seits zylindrischen Fläche 19 eines rohrförmigen Ansatz­teiles 20 des Hauptventilkörpers 4 begrenzt ist. Die einerander in der in Fig. 1 dargestellten Ausgangs­stellung des Hauptventilkörpers 4 in ganzer Länge ge­genüberliegenden Flächen 16,19 definieren einen Über­lappungsbereich zwischen dem Hauptventilkörper 4 und dem Trägerkörper 5, dessen Länge sich verringert, sobald der Hauptventilkörper 4 eine Aufwärtsbewegung in Richtung auf den Ringteil 6 ausführt. Der Hauptventilkörper 4 weist einen oberen, bis auf eine Durchgangsöffnung 21 geschlossenen Stirnteil 22 auf, der eine kegelige Ober­fläche 23 besitzt und in seinem zentralen Bereich in einen rohrförmigen Fortsatz 24 übergeht. Dieser bietet in Ausgangsstellung des Hauptventilkörpers 4 in Höhe der Durchlaßöffnung 7 im Ringteil 6 gelegene Seitenöffnungen 25 dar, die mit der Durchgangsöffnung 21 in Verbindung stehen. Diese Seitenöffnungen 25 bilden die Eintritts­öffnung für den in seinem oberen Bereich von der Durch­gangsöffnung 21 umgebenen und dann von den Durchgangs­öffnungen 12,10 forgesetzten Innenströmungskanal. Der Fortsatz 24 ist an seinem Stirnende 26 abgeschlossen und bildet auf diese Weise eine Art Pitotrohr.The carrier body 5 is cylindrical in the area of the outer surface 16 of its main part 17 and defines with this cylindrical outer surface 16 an annular gap 18 which is delimited on the outside by a cylindrical surface 19 of a tubular extension part 20 of the main valve body 4. The surfaces 16, 19 opposite one another in the starting position of the main valve body 4 over their entire length define an overlap area between the main valve body 4 and the carrier body 5, the length of which decreases as soon as the main valve body 4 moves upwards in the direction of the ring part 6 executes. The main valve body 4 has an upper end part 22, which is closed except for a through opening 21, which has a conical surface 23 and merges into a tubular extension 24 in its central region. In the starting position of the main valve body 4, this offers side openings 25 located in the ring part 6 at the level of the passage opening 7, which side openings 25 are connected to the passage opening 21 stand. These side openings 25 form the inlet opening for the inner flow channel surrounded in its upper region by the through opening 21 and then continued by the through openings 12, 10. The extension 24 is closed at its front end 26 and in this way forms a kind of pitot tube.

In dem Bereich zwischen einer ebenfalls kegelig abge­schrägten Unterseite 27 des Ringteils 6 und der kegeli­gen Oberseite 23 des Hauptventilkörpers 4 bildet der Außenströmungskanal 11 eine Drosselstrecke 28, deren Durchflußquerschnitt von der Stellung des Haupventil­körpers 4 abhängt.In the area between a likewise tapered underside 27 of the ring part 6 and the tapered top 23 of the main valve body 4, the external flow channel 11 forms a throttle section 28, the flow cross section of which depends on the position of the main valve body 4.

Der Spalt 18 zwischen dem Hauptventilkörper 4 und dem Trägerkörper 5 ist von Bohrspülungsmedium frei durch­strömbar und wird in allen Stellungen des Haupventil­körpers 4 zum Trägerkörper 5 von Bohrspülungsmedium auf­grund eines Druckgefälles zwischem dem Bohrspülungsmedi­um in der Durchgangsöffnung 12 und im Außenströmungska­nal 11 durchströmt.
In dem durch die Flächen 16,19 definierten Überlappungs­bereich bildet der Spalt 18 eine enge Drosselstrecke aus, und zwar dadurch, daß die Weite des Spaltes 18 im Bereich der Drosselstrecke eine Weite hat, die ein 100stel des Durchmessers des ringförmigen Spaltes 18 unterschreitet und bevorzugt im Bereich zwischen 0,05 und 0,5 mm, vorzugsweise 0,15 mm, beträgt.The drilling fluid medium can flow freely through the gap 18 between the main valve body 4 and the carrier body 5 and is flowed through by drilling fluid in all positions of the main valve body 4 relative to the carrier body 5 due to a pressure gradient between the drilling fluid in the through opening 12 and in the external flow channel 11.
In the overlap region defined by the surfaces 16, 19, the gap 18 forms a narrow throttling section, namely in that the width of the gap 18 in the area of the throttling section has a width which is less than a 100th of the diameter of the annular gap 18 and preferably in Range between 0.05 and 0.5 mm, preferably 0.15 mm.

Der Spalt 18 hat im Bereich der Drosselstrecke eine über seine Länge gleichbleibende Spaltweite. Die Drossel­strecke kann sich dabei im wesentlichen über die ganze Länge des Überlappungsbereiches zwischen dem Hauptven­tilkörper 4 und dem Trägerkörper 5 erstrecken, wie dies die Fig. 4 dargestellt, in der die Drosselstrecke des Spaltes mit 29 bezeichnet ist.The gap 18 has a gap width which is constant over its length in the region of the throttle section. The throttle section can extend essentially over the entire length of the overlap region between the main valve body 4 and the carrier body 5, as shown in FIG. 4, in which the throttle section of the Column is designated 29.

Statt dessen kann der Spalt 18 im Überlappungsbereich auch zwei (oder mehr) im Abstand hintereinander liegende Drosselstrecken 30 bilden, wie dies in den Fig. 2 und 3 schematisch wiedergegeben ist. Dabei hat der Spalt 18 in den an die Drosselstrecken 30 angrezenden Bereichen eine wesentlich größere Spaltweite, wie dies ebenfalls in den Fig. 2 und 3 verdeutlicht ist.Instead, the gap 18 in the overlap region can also form two (or more) throttle sections 30 which are spaced one behind the other, as is shown schematically in FIGS. 2 and 3. The gap 18 has a much larger gap width in the areas adjacent to the throttle sections 30, as is also illustrated in FIGS. 2 and 3.

Anstelle der Möglichkeit, die Teile 4,5 als Verschleiß­teile zu betrachten und bei eintretendem Verschleiß durch abrasive Wirkung des Bohrspülungsmediums im Be­reich des Spaltes 18 gegen neue Teile auszutauschen, besteht auch die Möglichkeit, daß der Spalt 18 ein oder beidseitig im Bereich der Drosselstrecken 29,30 von einer die Oberfläche einer Panzerung 31 bildenden Fläche begrenzt ist, wie dies für die Drosselstrecken 30 in Fig. 2 und 3 wiedergegeben ist.Instead of the possibility of considering the parts 4, 5 as wearing parts and, in the event of wear due to the abrasive action of the drilling fluid in the area of the gap 18, being replaced by new parts, there is also the possibility that the gap 18 on one or both sides in the area of the throttle sections 29, 30 is delimited by a surface forming the surface of an armor 31, as is shown for the throttle sections 30 in FIGS. 2 and 3.

Die Panzerung 31 kann dabei als Auftragsschicht ausgeführt sein, wie dies Fig. 2 wiedergibt, oder von auf- oder eingesetzten Hülsenteilen 32, die durch ge­strichelte Linien in Fig. 3 bzw. 4 angedeutet sind. Be­vorzugt findet als Material für die Panzerung Wolfram­carbid Anwendung.The armor 31 can be designed as an application layer, as shown in FIG. 2, or of sleeve parts 32 that are attached or inserted, which are indicated by dashed lines in FIGS. 3 and 4. Tungsten carbide is preferably used as the material for the armor.

In Abwandlung von dem dargestellten Beispiel kann auch irgendein anderes Ventil Verwendung finden, sofern die­ses mit einem in einem Außenteil koaxial angeordneten Hauptventilkörper mit Trägerkörper als Stütz- und Führungselement versehen ist, und die beiden letzteren einen Überlappungsbereich mit einem zylindrischen Spalt begrezen.As a modification of the example shown, any other valve can also be used, provided that it is provided with a main valve body, which is arranged coaxially in an outer part and has a carrier body as a support and guide element, and the latter two define an overlap area with a cylindrical gap.

Claims (10)

1. Vorrichtung zur Erzeugung von Druckpulsen in einem einen Bohrrohrstrang (1) abwärts durchströmenden Bohr­spülungsmedium, mit einem in dem Bohrrohrstrang (1) an­geordneten Ventil, das einen ortsfest abgestützten, rohrförmigen Außenteil (3), einen in diesem koaxial un­ter Belassung eines ringförmigen Außenströmungskanals (11) angeordneten, axial verschieblichen, rohrförmigen Hauptventilkörper (4), einen koaxial im Hauptventilkör­per (4) angeordneten, ortsfesten, rohrförmigen Träger­körper (5), der im Überlappungsbereich mit dem Hauptven­tilkörper (4) mit diesem einen zylindrischen Spalt (18) begrenzt, und einem mittels eines Antriebs (15) betätig­baren Hilfsventil (13,14), von denen der Außenteil (3) und der Hauptventilkörper (4) zwischen sich eine Dros­selstrecke (28) im Außenströmungskanal (11) mit in Ab­hängigkeit von der Stellung des Hauptventilkörpers (4) veränderlichem Durchflußquerschnitt begrezen, und von denen der Hauptventilkörper (4) und der Trägerkörper (5) einen Innenströmungskanal (21,12,10) umgeben, dessen Eintrittsöffnung (25) zentral in dem in Strömungsrich­tung (2) oberen, geschlossenen Stirnteil (22) des Haupt­ventilkörpers (4) vorgesehen und dessen Austrittsöffnung (13) zentral an dem in Strömungsrichtung (2) unteren geschlossenen Fußteil (8) des Trägerkörpers (5) ange­ordnet und mittels des Hilfsventilkörpers (14) freigeb­und verschließbar ist, dadurch gekennzeichnet, daß der Spalt (18) zwischen dem Hauptventilkörper (4) und dem Trägerkörper (5) von Bohrspülungsmedium frei durchström­bar ist und im Überlappungsbereich eine enge Drossel­strecke (29;30) bildet.1. Device for generating pressure pulses in a drilling fluid flowing down a drill pipe string (1), with a valve arranged in the drill pipe string (1), which has a stationary, tubular outer part (3), one coaxially in this, leaving an annular outer flow channel ( 11) arranged, axially displaceable, tubular main valve body (4), a stationary tubular support body (5) arranged coaxially in the main valve body (4), which delimits a cylindrical gap (18) in the area of overlap with the main valve body (4), and an auxiliary valve (13, 14) which can be actuated by means of a drive (15), of which the outer part (3) and the main valve body (4) have a throttle section (28) between them in the outer flow channel (11) depending on the position of the main valve body (4 ) limit variable flow cross-section, and of which the main valve body (4) and the carrier body (5) surround an internal flow channel (21, 12, 10), the inlet opening (25) of which is provided centrally in the upper, closed end part (22) of the main valve body (4) in the flow direction (2) and the outlet opening (13) of which is centrally located on the in The direction of flow (2) of the lower closed foot part (8) of the carrier body (5) is arranged and can be closed freely by means of the auxiliary valve body (14), characterized in that the gap (18) between the main valve body (4) and the carrier body (5) of drilling fluid can flow freely and forms a narrow throttle section (29; 30) in the overlap area. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Weite des Spaltes (18) im Bereich der Drossel­strecke (29;30) kleiner ist als ein Hunderstel des Spaltdurchmessers.2. Apparatus according to claim 1, characterized in that the width of the gap (18) in the region of the throttle section (29; 30) is smaller than one hundredth of the gap diameter. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß die Weite des Spaltes (18) im Bereich der Drosselstrecke (29;30) 0,05 - 0,5 mm, insbesondere 0,15 mm, beträgt.3. Device according to claim 1 or 2, characterized in that the width of the gap (18) in the region of the throttle section (29; 30) is 0.05 - 0.5 mm, in particular 0.15 mm. 4. Vorrichtung nach Anspruch 1 bis 3, dadurch gekenn­zeichnet, daß der Spalt (18) im Bereich der Drossel­strecke (29;30) eine über seine Länge gleichbleibende Spaltweite aufweist.4. Apparatus according to claim 1 to 3, characterized in that the gap (18) in the region of the throttle section (29; 30) has a gap width which is constant over its length. 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sich die Drosselstrecke (29) im wesentlichen über die ganze Länge des Überlappungsbe­reichs erstreckt.5. Device according to one of claims 1 to 4, characterized in that the throttle section (29) extends substantially over the entire length of the overlap area. 6. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Spalt (18) im Überlappungsbe­reich zumindest zwei im Abstand hintereinanderliegende Drosselstrecken (30) bildet, wobei in den im Überlap­pungsbereich an die Drosselstrecke (30) angrezenden Bereichen des Spaltes (18) dieser eine wesentlich größere Spaltweite hat.6. Device according to one of claims 1 to 4, characterized in that the gap (18) in the overlap area forms at least two throttle sections (30) one behind the other at a distance, wherein in the overlap area adjoining the throttle section (30) areas of the gap (18 ) this has a much larger gap width. 7. Vorrichtung nach Anspruch 1 bis 6, dadurch gekenn­zeichnet, daß der Spalt (18) im Bereich der Drossel­strecke (29;30) zumindest einseitig von einer die Ober­fläche einer Panzerung (31) bildenden Fläche begrenzt ist.7. The device according to claim 1 to 6, characterized in that the gap (18) in the region of the throttle section (29; 30) is bounded at least on one side by a surface forming an armor (31). 8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Panzerung von auf- oder eingesetzten Hülsentei­ len (32) aus hochfestem Material gebildet ist.8. The device according to claim 7, characterized in that the armor of on or used sleeve duck len (32) is made of high-strength material. 9. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Panzerung (31) als Auftragsschicht ausgeführt ist.9. The device according to claim 7, characterized in that the armor (31) is designed as an application layer. 10. Vorrichtung nach Anspruch 7 bis 9, dadurch gekenn­zeichnet, daß die Panzerung (31) aus Wolframcarbid ge­bildet ist.10. The device according to claim 7 to 9, characterized in that the armor (31) is formed from tungsten carbide.
EP88107134A 1987-05-09 1988-05-04 Device for generating pressure pulses in a drilling fluid Withdrawn EP0290938A3 (en)

Applications Claiming Priority (2)

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DE3715512A DE3715512C1 (en) 1987-05-09 1987-05-09
DE3715512 1987-09-09

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EP0290938A2 true EP0290938A2 (en) 1988-11-17
EP0290938A3 EP0290938A3 (en) 1990-07-25

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DE (1) DE3715512C1 (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3926908C1 (en) * 1989-08-16 1990-10-11 Eastman Christensen Co., Salt Lake City, Utah, Us
CA2175296A1 (en) * 1996-04-29 1997-10-30 Bruno H. Walter Flow pulsing method and apparatus for the increase of the rate of drilling
US5836353A (en) * 1996-09-11 1998-11-17 Scientific Drilling International, Inc. Valve assembly for borehole telemetry in drilling fluid
GB2360800B (en) * 2000-03-29 2003-11-12 Geolink Improved signalling system for drilling
ATE315716T1 (en) 2001-01-24 2006-02-15 Geolink Uk Ltd PRESSURE PULSE GENERATOR FOR BOREHOLE MEASUREMENT DURING DRILLING
CA2686737C (en) * 2007-05-03 2015-10-06 David John Kusko Flow hydraulic amplification for a pulsing, fracturing, and drilling (pfd) device
US8720572B2 (en) * 2008-12-17 2014-05-13 Teledrill, Inc. High pressure fast response sealing system for flow modulating devices
MX2011006666A (en) * 2008-12-17 2011-09-06 Gabor Vecseri High pressure fast response sealing system for flow modulating devices.
CA2689038C (en) * 2009-11-10 2011-09-13 Sanjel Corporation Apparatus and method for creating pressure pulses in a wellbore
WO2012138314A1 (en) 2011-04-06 2012-10-11 David John Kusko Hydroelectric control valve for remote locations
US8967268B2 (en) * 2011-11-30 2015-03-03 Baker Hughes Incorporated Setting subterranean tools with flow generated shock wave
GB2505632A (en) * 2012-02-21 2014-03-12 Tendeka Bv Flow control device
GB2518872B (en) * 2013-10-03 2016-03-30 Goodwin Plc Valve
US10794135B2 (en) * 2017-04-03 2020-10-06 Charles Abernethy Anderson Differential pressure actuation tool and method of use

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065416A (en) * 1960-03-21 1962-11-20 Dresser Ind Well apparatus
FR1603706A (en) * 1968-05-15 1971-05-24 Transmitting measurements from bottom ofa borehole
US3958217A (en) * 1974-05-10 1976-05-18 Teleco Inc. Pilot operated mud-pulse valve

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US29734A (en) * 1860-08-21 Improvement in corn-planters
DE1583012B1 (en) * 1967-09-22 1971-03-18 Inst Burovoi Tekhnik Tour counter for drilling turbines
US3764969A (en) * 1972-06-15 1973-10-09 Schlumberger Technology Corp Well bore data - transmission apparatus with debris clearing apparatus
US3764970A (en) * 1972-06-15 1973-10-09 Schlumberger Technology Corp Well bore data-transmission apparatus with debris clearing apparatus
FR2434922A1 (en) * 1978-08-28 1980-03-28 Inst Francais Du Petrole DEVICE FOR REVERSE THE DIRECTION OF FLOW OF A FLUID AT A DRILLING TOOL
DE3028813C2 (en) * 1980-07-30 1983-09-08 Christensen, Inc., 84115 Salt Lake City, Utah Method and device for the remote transmission of information

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065416A (en) * 1960-03-21 1962-11-20 Dresser Ind Well apparatus
FR1603706A (en) * 1968-05-15 1971-05-24 Transmitting measurements from bottom ofa borehole
US3958217A (en) * 1974-05-10 1976-05-18 Teleco Inc. Pilot operated mud-pulse valve

Also Published As

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DE3715512C1 (en) 1988-10-27
EP0290938A3 (en) 1990-07-25
US4905778A (en) 1990-03-06

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