EP0413097B1 - Device for creating pressure impulses in drilling mud - Google Patents

Device for creating pressure impulses in drilling mud Download PDF

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Publication number
EP0413097B1
EP0413097B1 EP90110691A EP90110691A EP0413097B1 EP 0413097 B1 EP0413097 B1 EP 0413097B1 EP 90110691 A EP90110691 A EP 90110691A EP 90110691 A EP90110691 A EP 90110691A EP 0413097 B1 EP0413097 B1 EP 0413097B1
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EP
European Patent Office
Prior art keywords
main valve
valve body
tubular
housing
carrier body
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Expired - Lifetime
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EP90110691A
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German (de)
French (fr)
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EP0413097A1 (en
Inventor
Dagobert Feld
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Baker Hughes Oilfield Operations LLC
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Eastman Teleco Co
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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 through a drill pipe string in an embodiment according to the preamble of claim 1.
  • the main valve body is supported and guided axially displaceably on the carrier body in the region of its rearward end in the direction of flow.
  • the main valve body has a tubular extension on its end facing the flow, which has a diameter below the diameter of the constriction, extends through the constriction against the direction of flow and has side slots in the region of its end, which form the inlet opening for the internal flow channel.
  • the invention has for its object to provide a particularly simple, low-wear and reliable device of the type mentioned, and the invention solves this problem by a device with the features of claim 1. With regard to essential further embodiments reference is made to claims 2 to 8.
  • the assignment of the tube extension to the support body makes the pressure withdrawal before the constriction of the housing independent of the position and movements of the main valve body and thus free of the resulting fluctuations.
  • the design of the main valve body is simplified, which is therefore less subject to wear and offers increased sensitivity.
  • the double guidance of the main valve body counteracts tilting movements and the resulting clamping phenomena, so that the device can also be used reliably in drilling fluid containing sand and in drill pipe strands for directional, in particular horizontal, drilling.
  • With a simplified possibility for cable routing and for establishing a mechanical and / or electrical connection to the device above the housing there is also the particularly interesting possibility of designing the main part of the device as a pull-up unit.
  • the device illustrated in the drawing for generating pressure pulses in a drilling fluid flowing through a drill pipe string 1 comprises in particular a tubular casing 2 which is supported in a stationary manner in the drill pipe string 1 with a constriction, which in the illustrated example has a separate end on the front end in the direction of flow 4 Housing 2 attached ring body 3 is formed.
  • a support body 5 is supported in a stationary manner, which is essentially tubular and has a foot part 6 and a tube extension 7, which has a diameter which is below the diameter of the constriction 3 of the housing 2 and through the constriction 3 through the flow direction 4 to in the high pressure area of the flowing drilling fluid is preferred.
  • a substantially tubular main valve body 8 is supported on the carrier body 5, which, like the carrier body 5, is arranged coaxially in the housing 2 and axially from its illustrated starting position, defined by a shoulder 9 of the carrier body 5, against the flow direction 4 of the drilling fluid into an upper operating end position is movable.
  • the main valve body 8 defines between itself and the housing 2 an external flow channel 10 for the drilling fluid and between a tapering front end 11 and the constriction 3 a throttle section with a variable flow cross-section depending on the position of the main valve body 8.
  • the carrier body 5 has in the area of its foot part 6 a sliding guide area 13, on which the rear area of the main valve body 8 is slidably supported.
  • This sliding guide area 13 is preferably provided with a hard covering, e.g. a separate sleeve made of tungsten carbide, which, as armouring, reduces wear in the sliding guide area. This is particularly important for drilling fluid that contains abrasive particles such as sand.
  • the front end 11 of the main valve body 8, which tapers against the direction of flow 4, is also supported and guided on the tubular extension 7 in the region of a second sliding guide 14, which can also be formed by a hard metal sleeve or another armored hard metal coating.
  • the assignment of the tubular extension 7 to the carrier body 5 enables a substantial simplification of the shape of the main valve body 8.
  • the main valve body 8 can present a lower moment of inertia and accordingly react more sensitively to pressure differences which act on it.
  • the simplification in shape reduces the wear to which the main valve body 8 is exposed during operation, in particular in drilling fluid with abrasive particles such as sand.
  • the carrier body 5 delimits a coaxial, continuous internal flow channel 15, the inlet opening of which is arranged centrally and in the flow direction 4 in front of the constriction 3 of the housing 2 and is formed by a number of radially oriented bores 16. These bores 16 are made in an attachment part 17 arranged on the end of the tubular extension 7, the upper end of which is designed as a coupling pin 18 for a drawing tool.
  • the attachment part 17 has a rear end face 19, which forms a securing stop for the main valve body 8 and prevents the main valve body 8 from sliding off the carrier body 5 against the direction of flow 4, which is possible with the drill pipe string 1 aligned horizontally under certain pressure conditions and then not when the clear inner diameter of the ring body 3 exceeds the outer diameter of the main valve body 8.
  • the bores 16 defining the inlet opening for the inner flow channel 15 are preceded by a common sieve 20, the outer surface of which is coaxially aligned and aligned with the outer surface of the attachment part 17.
  • the outer surface of the screen 20 is therefore flowed over in parallel over the entire axial length of the drilling fluid, so that the screen is exposed to constant self-cleaning. This is particularly important when the drilling fluid is offset with sealing additives.
  • An annular space 21 is provided behind the sieve 20, from which the bores 16 open, so that all of them Bores 16 remain operational even if the screen 20 should be temporarily partially blocked.
  • the inner flow channel 15 has an extension 22 in the region of the foot part 6 of the carrier body 5, and the extension 22 is connected via connecting channels 23 to a pressure chamber 24 which is provided between the tubular extension 7 of the carrier body 5 and the main valve body 8. Accordingly, a pressure prevails in the pressure chamber 24 which corresponds to the pressure in the drilling fluid in the internal flow channel 15 at the level of the branch of the connecting channels 23.
  • the inner flow channel has an outlet opening in the form of a valve opening 25 in a valve seat part 26 screwed into the extension 22 of the inner flow channel 15.
  • This valve opening 25 can be closed by means of a valve body 27, which can be moved from its open position to a closed position by means of a drive (not shown), for example formed by an electromagnet.
  • the parts 26, 27 form an auxiliary valve, through which the flow through the inner flow channel 15 with drilling fluid can be released or blocked.
  • the auxiliary valve 26, 27 is controlled by a device (not illustrated in more detail) for determining measurement data from the borehole, which is arranged downstream of the carrier body 5, and the pressure pulses initiated by the auxiliary valve 26, 27 in the drilling fluid are received above ground by a pressure sensor and one Evaluation device supplied.
  • a device not illustrated in more detail
  • the auxiliary valve 26, 27 is closed due to activation by the measuring device.
  • the internal flow channel 15 and thus in the pressure chamber 24 builds accordingly a pressure which corresponds to the pressure of the drilling fluid at the level of the inlet opening of the internal flow channel 15.
  • This pressure prevailing in the pressure chamber 24 exerts hydraulic forces directed against the flow direction 4 on the main valve body 8, the sum of which exceeds the sum of the forces acting in the flow direction on the main valve body 8 located in the starting position.
  • the hydraulic forces acting axially in the flow direction 4 on the main valve body 8 are composed of static and dynamic forces which are derived from the pressure and flow conditions in the external flow channel 10, 12.
  • the hydraulically effective dimensions are coordinated with one another in such a way that the total results against all flow forces acting on the main valve body 8 against the direction of flow 4 at the time when the main valve body 8 follows the closing of the auxiliary valve 26, 27 begins to move upward from its starting position, is initially relatively small, then increases with increasing stroke length and finally decreases again until it reaches the value zero.
  • the main valve body 8 assumes its operating pulse position which determines the pressure pulse, in which the main valve body 8 floats in the drilling fluid without a stop.
  • the pressure in the pressure chamber increases 24 again a value at which the sum of the forces acting in the flow direction 4 on the main valve body 8 exceeds the sum of the forces acting against the flow direction 4, with the result that the main valve body 8 returns to its illustrated starting position and is ready for a new pressure pulse generating work cycle .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Geophysics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Details Of Valves (AREA)
  • Sliding Valves (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Erzeugung von Druckpulsen in einem einen Bohrrohrstrang durchströmende Bohrspülungsmedium in einer Ausbildung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for generating pressure pulses in a drilling fluid flowing through a drill pipe string in an embodiment according to the preamble of claim 1.

Bei bekannten Vorrichtungen dieser Art (DE-C-37 15 514, US-A-3 958 217) ist der Hauptventilkörper im Bereich seines in Strömungsrichtung rückwärtigen Endes auf dem Trägerkörper axial verschieblich abgestützt und geführt. Der Hauptventilkörper weist dabei an seiner der Strömung zugewandten Stirnseite einen Rohrfortsatz auf, der einen den Durchmesser der Engstelle unterschreitenden Durchmesser hat, sich entgegen Strömungsrichtung durch die Engstelle hindurch erstreckt und im Bereich seines Endes Seitenschlitze aufweist, welche die Eintrittsöffnung für den Innenströmungskanal bilden.In known devices of this type (DE-C-37 15 514, US-A-3 958 217), the main valve body is supported and guided axially displaceably on the carrier body in the region of its rearward end in the direction of flow. The main valve body has a tubular extension on its end facing the flow, which has a diameter below the diameter of the constriction, extends through the constriction against the direction of flow and has side slots in the region of its end, which form the inlet opening for the internal flow channel.

Der Erfindung liegt die Aufgabe zugrunde, eine besonders einfache, verschleißarme und funktionssichere Vorrichtung der genannten Art zu schaffen, und die Erfindung löst diese Aufgabe durch eine Vorrichtung mit den Merkmalen des Anspruchs 1. Hinsichtlich wesentlicher weiterer Ausgestaltungen wird auf die Ansprüche 2 bis 8 verwiesen.The invention has for its object to provide a particularly simple, low-wear and reliable device of the type mentioned, and the invention solves this problem by a device with the features of claim 1. With regard to essential further embodiments reference is made to claims 2 to 8.

Die Zuordnung des Rohrfortsatzes zum Trägerkörper macht die Druckentnahme vor der Engstelle des Gehäuses von der Stellung und von Bewegungen des Hauptventilkörpers unabhängig und damit von daraus resultierenden Schwankungen frei. Zugleich vereinfacht sich die Ausbildung des Hauptventilkörpers, der daher geringerem Verschleiß unterliegt und eine erhöhte Ansprechempfindlichkeit bietet. Die Doppelführung des Hauptventilkörpers wirkt Kippbewegungen und daraus resultierenden Klemmerscheinungen entgegen, so daß die Vorrichtung zuverlässig auch in sandhaltigen Bohrspülungsmedien sowie in Bohrrohrsträngen für Richtungs-, insbesondere Horizontalbohrungen, Verwendung finden kann. Bei vereinfachter Möglichkeit zur Kabelumführung und zur Herstellung einer mechanischen und/oder elektrischen Verbindung mit der Vorrichtung oberhalb des Gehäuses ist ferner die besonders interessante Möglichkeit gegeben, den Hauptteil der Vorrichtung als aufziehbare Baueinheit auszubilden.The assignment of the tube extension to the support body makes the pressure withdrawal before the constriction of the housing independent of the position and movements of the main valve body and thus free of the resulting fluctuations. At the same time, the design of the main valve body is simplified, which is therefore less subject to wear and offers increased sensitivity. The double guidance of the main valve body counteracts tilting movements and the resulting clamping phenomena, so that the device can also be used reliably in drilling fluid containing sand and in drill pipe strands for directional, in particular horizontal, drilling. With a simplified possibility for cable routing and for establishing a mechanical and / or electrical connection to the device above the housing, there is also the particularly interesting possibility of designing the main part of the device as a pull-up unit.

Weitere Einzelheiten ergeben sich aus der nachfolgenden Beschreibung und der Zeichnung, in der ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in einem abgebrochenen Längsschnitt veranschaulicht ist.Further details result from the following description and the drawing, in which an embodiment of the device according to the invention is illustrated in a broken longitudinal section.

Die in der Zeichnung veranschaulichte Vorrichtung zur Erzeugung von Druckpulsen in einem einen Bohrrohrstrang 1 durchströmenden Bohrspülungsmedium umfaßt im einzelnen ein im Bohrrohrstrang 1 ortsfest abgestütztes rohrförmiges Gehäuse 2 mit einer Engstelle, die bei dem dargestellten Beispiel von einem gesonderten, auf das in Strömungsrichtung 4 vordere Ende des Gehäuses 2 aufgesetzten Ringkörper 3 gebildet ist.The device illustrated in the drawing for generating pressure pulses in a drilling fluid flowing through a drill pipe string 1 comprises in particular a tubular casing 2 which is supported in a stationary manner in the drill pipe string 1 with a constriction, which in the illustrated example has a separate end on the front end in the direction of flow 4 Housing 2 attached ring body 3 is formed.

Im Gehäuse 2 ist ein Trägerkörper 5 ortsfest abgestützt, der im wesentlichen rohrförmig ausgebildet ist und einen Fußteil 6 sowie einen Rohrfortsatz 7 aufweist, der einen den Durchmesser der Engstelle 3 des Gehäuses 2 unterschreitenden Durchmesser aufweist und durch die Engstelle 3 hindurch entgegen Strömungsrichtung 4 bis in den Hochdruckbereich des strömenden Bohrspülungsmediums vorgezogen ist.In the housing 2, a support body 5 is supported in a stationary manner, which is essentially tubular and has a foot part 6 and a tube extension 7, which has a diameter which is below the diameter of the constriction 3 of the housing 2 and through the constriction 3 through the flow direction 4 to in the high pressure area of the flowing drilling fluid is preferred.

Auf dem Trägerkörper 5 ist ein im wesentlichen rohrförmiger Hauptventilkörper 8 abgestützt, der ebenso wie der Trägerkörper 5 koaxial im Gehäuse 2 angeordnet ist und axial aus seiner dargestellten, durch eine Schulter 9 des Trägerkörpers 5 definierten Ausgangslage entgegen der Strömungsrichtung 4 des Bohrspülungsmediums in eine obere Betriebsendstellung verschieblich ist. Der Hauptventilkörper 8 begrenzt zwischen sich und dem Gehäuse 2 einen Außenströmungskanal 10 für die Bohrspülung und zwischen einem sich verjüngenden vorderen Ende 11 und der Engstelle 3 eine Drosselstrecke mit in Abhängigkeit von der Stellung des Hauptventilkörpers 8 veränderlichem Durchflußquerschnitt.A substantially tubular main valve body 8 is supported on the carrier body 5, which, like the carrier body 5, is arranged coaxially in the housing 2 and axially from its illustrated starting position, defined by a shoulder 9 of the carrier body 5, against the flow direction 4 of the drilling fluid into an upper operating end position is movable. The main valve body 8 defines between itself and the housing 2 an external flow channel 10 for the drilling fluid and between a tapering front end 11 and the constriction 3 a throttle section with a variable flow cross-section depending on the position of the main valve body 8.

Der Trägerkörper 5 weist im Bereich seines Fußteils 6 einen Gleitführungsbereich 13 auf, auf dem sich der rückwärtige Bereich des Hauptventilkörpers 8 verschieblich abstützt. Dieser Gleitführungsbereich 13 ist bevorzugt mit einem Hartbelag, z.B. einer gesonderten Hülse aus Wolframkarbid, versehen, der als Panzerung den Verschleiß im Gleitführungsbereich herabsetzt. Dies ist insbesondere bei Bohrspülungsmedien, die abrasive Partikel wie Sand mit sich führen, von Bedeutung.The carrier body 5 has in the area of its foot part 6 a sliding guide area 13, on which the rear area of the main valve body 8 is slidably supported. This sliding guide area 13 is preferably provided with a hard covering, e.g. a separate sleeve made of tungsten carbide, which, as armouring, reduces wear in the sliding guide area. This is particularly important for drilling fluid that contains abrasive particles such as sand.

Auch das sich entgegen Strömungsrichtung 4 verjüngende vordere Ende 11 des Hauptventilkörpers 8 ist auf dem Rohrfortsatz 7 im Bereich einer zweiten Gleitführung 14 abgestützt und geführt, die ebenfalls von einer Hartmetallhülse oder einem sonstigen panzernden Hartmetallbelag gebildet sein kann. Durch diese Doppelführung des Hauptventilkörpers 8, der seinerseits vollständig aus einem Hartmetall, z.B. Wolframkarbid, bestehen kann, werden Kippbewegungen mit der Folge eines Verklemmens des Hauptventilkörpers 8 auf dem Trägerkörper 5 wirksam auch dann vermieden, wenn die Vorrichtung in einem horizontalen Bohrrohrstrang, für den die erfindungsgemäße Vorrichtung besonders geeignet ist, zum Einsatz kommt.The front end 11 of the main valve body 8, which tapers against the direction of flow 4, is also supported and guided on the tubular extension 7 in the region of a second sliding guide 14, which can also be formed by a hard metal sleeve or another armored hard metal coating. This double guidance of the main valve body 8, which in turn can consist entirely of a hard metal, for example tungsten carbide, effectively prevents tilting movements with the result of the main valve body 8 becoming jammed on the carrier body 5 even when the device is in a horizontal drill pipe string for which the device according to the invention is particularly suitable is used.

Die Zuordnung des Rohrfortsatzes 7 zum Trägerkörper 5 ermöglicht eine wesentliche Vereinfachung der Gestalt des Hauptventilkörpers 8. Infolge dieser Vereinfachung kann der Hauptventilkörper 8 ein geringeres Massenträgheitsmoment darbieten und dementsprechend empfindlicher auf Druckdifferenzen reagieren, die auf ihn einwirken. Insbesondere aber vermindert die Vereinfachung in der Gestalt den Verschleiß, dem der Hauptventilkörper 8 im Betrieb, insbesondere in Bohrspülungsmedien mit abrasiven Partikeln wie Sand, ausgesetzt ist.The assignment of the tubular extension 7 to the carrier body 5 enables a substantial simplification of the shape of the main valve body 8. As a result of this simplification, the main valve body 8 can present a lower moment of inertia and accordingly react more sensitively to pressure differences which act on it. In particular, however, the simplification in shape reduces the wear to which the main valve body 8 is exposed during operation, in particular in drilling fluid with abrasive particles such as sand.

Der Trägerkörper 5 umgrenzt einen koaxialen, durchgehenden Innenströmungskanal 15, dessen Eintrittsöffnung zentral und in Strömungsrichtung 4 vor der Engstelle 3 des Gehäuses 2 angeordnet und von einer Anzahl von radial ausgerichteten Bohrungen 16 gebildet ist. Diese Bohrungen 16 sind in einem auf dem Ende des Rohrfortsatzes 7 angeordneten Aufsatzteil 17 angebracht, dessen oberes Ende als Kupplungszapfen 18 für ein Ziehwerkzeug ausgebildet ist. Der Aufsatzteil 17 weist eine rückwärtige Stirnfläche 19 auf, die einen Sicherungsanschlag für den Hauptventilkörper 8 bildet und verhindert, daß der Hauptventilkörper 8 vom Trägerkörper 5 entgegen Strömungsrichtung 4 abgleitet, was bei horizontal ausgerichtetem Bohrrohrstrang 1 unter bestimmten Druckverhältnissen und dann nicht ausgeschlossen ist, wenn der lichte Innendurchmesser des Ringkörpers 3 den Außendurchmesser des Hauptventilkörpers 8 überschreitet.The carrier body 5 delimits a coaxial, continuous internal flow channel 15, the inlet opening of which is arranged centrally and in the flow direction 4 in front of the constriction 3 of the housing 2 and is formed by a number of radially oriented bores 16. These bores 16 are made in an attachment part 17 arranged on the end of the tubular extension 7, the upper end of which is designed as a coupling pin 18 for a drawing tool. The attachment part 17 has a rear end face 19, which forms a securing stop for the main valve body 8 and prevents the main valve body 8 from sliding off the carrier body 5 against the direction of flow 4, which is possible with the drill pipe string 1 aligned horizontally under certain pressure conditions and then not when the clear inner diameter of the ring body 3 exceeds the outer diameter of the main valve body 8.

Zur Herabsetzung von Verstopfungsgefahren ist den die Eintrittsöffnung für den Innenströmungskanal 15 definierenden Bohrungen 16 ein gemeinsames Sieb 20 vorgeordnet, dessen Außenfläche koaxial ausgerichtet ist und mit der Außenfläche des Aufsatzteils 17 fluchtet. Die Außenfläche des Siebs 20 wird daher in voller axialer Länge parallel von dem Bohrspülungsmedium überströmt, so daß das Sieb einer ständigen Selbstreinigung ausgesetzt ist. Dies ist insbesondere bei Versatz des Bohrspülungsmediums mit dichtenden Zusätzen von Bedeutung. Hinter dem Sieb 20 ist ein Ringraum 21 vorgesehen, aus dem die Bohrungen 16 ausmünden, so daß sämtliche Bohrungen 16 auch dann betriebsbereit bleiben, wenn das Sieb 20 vorübergehend partiell verstopft sein sollte.To reduce the risk of clogging, the bores 16 defining the inlet opening for the inner flow channel 15 are preceded by a common sieve 20, the outer surface of which is coaxially aligned and aligned with the outer surface of the attachment part 17. The outer surface of the screen 20 is therefore flowed over in parallel over the entire axial length of the drilling fluid, so that the screen is exposed to constant self-cleaning. This is particularly important when the drilling fluid is offset with sealing additives. An annular space 21 is provided behind the sieve 20, from which the bores 16 open, so that all of them Bores 16 remain operational even if the screen 20 should be temporarily partially blocked.

Der Innenströmungskanal 15 weist im Bereich des Fußteils 6 des Trägerkörpers 5 eine Erweiterung 22 auf, und die Erweiterung 22 steht über Verbindungskanäle 23 mit einer Druckkammer 24 in Verbindung, die zwischen dem Rohrfortsatz 7 des Trägerkörpers 5 und dem Hauptventilkörper 8 vorgesehen ist. In der Druckkammer 24 herrscht dementsprechend ein Druck, der dem Druck im Bohrspülungsmedium im Innenströmungskanal 15 in Höhe des Abzweigs der Verbindungskanäle 23 entspricht.The inner flow channel 15 has an extension 22 in the region of the foot part 6 of the carrier body 5, and the extension 22 is connected via connecting channels 23 to a pressure chamber 24 which is provided between the tubular extension 7 of the carrier body 5 and the main valve body 8. Accordingly, a pressure prevails in the pressure chamber 24 which corresponds to the pressure in the drilling fluid in the internal flow channel 15 at the level of the branch of the connecting channels 23.

Der Innenströmungskanal weist im Bereich des Fußteils 6 des Trägerkörpers 5 eine Austrittsöffnung in der Gestalt einer Ventilöffnung 25 in einem in die Erweiterung 22 des Innenströmungskanals 15 eingeschraubten Ventilsitzteils 26 auf. Diese Ventilöffnung 25 ist mittels eines Ventilkörpers 27 verschließbar, der mittels eines nicht näher dargestellten, beispielsweise von einem Elektromagneten gebildeten Antriebs aus seiner dargestellten Offenstellung in eine Schließstellung bewegbar ist. Die Teile 26,27 bilden ein Hilfsventil, durch das die Durchströmung des Innenströmungskanals 15 mit Bohrspülungsmedium freigeb- oder absperrbar ist.In the region of the foot part 6 of the carrier body 5, the inner flow channel has an outlet opening in the form of a valve opening 25 in a valve seat part 26 screwed into the extension 22 of the inner flow channel 15. This valve opening 25 can be closed by means of a valve body 27, which can be moved from its open position to a closed position by means of a drive (not shown), for example formed by an electromagnet. The parts 26, 27 form an auxiliary valve, through which the flow through the inner flow channel 15 with drilling fluid can be released or blocked.

Das Hilfsventil 26,27 wird durch eine nicht näher veranschaulichte Vorrichtung zur Ermittlung von Meßdaten aus dem Bohrloch, die stromab des Trägerkörpers 5 angeordnet ist, gesteuert, und die durch das Hilfsventil 26,27 initiierten Druckpulse im Bohrspülungsmedium werden von einem Drucksensor oberirdisch empfangen und einer Auswertevorrichtung zugeleitet. Insoweit kann auf die Darstellungen und Darlegungen in der DE-C-37 15 514 verwiesen werden.The auxiliary valve 26, 27 is controlled by a device (not illustrated in more detail) for determining measurement data from the borehole, which is arranged downstream of the carrier body 5, and the pressure pulses initiated by the auxiliary valve 26, 27 in the drilling fluid are received above ground by a pressure sensor and one Evaluation device supplied. In this respect, reference can be made to the representations and explanations in DE-C-37 15 514.

Zur Erzeugung eines Druckpulses im Bohrspülungsmedium wird aufgrund einer Ansteuerung durch die Meßvorrichtung das Hilfsventil 26,27 geschlossen. Im Innenströmungskanal 15 und damit in der Druckkammer 24 baut sich dementsprechend ein Druck auf, der dem Druck des Bohrspülungsmediums in Höhe der Eintrittsöffnung des Innenströmungskanals 15 entspricht. Dieser in der Druckkammer 24 herrschende Druck übt auf den Hauptventilkörper 8 entgegen der Strömungsrichtung 4 gerichtete hydraulische Kräfte aus, deren Summe die Summe der in Strömungsrichtung auf den in der Ausgangsstellung befindlichen Hauptventilkörper 8 wirkenden Kräfte übersteigt. Die axial in Strömungsrichtung 4 auf den Hauptventilkörper 8 wirkenden hydraulischen Kräfte setzen sich aus statischen und dynamischen Kräften zusammen, die sich aus den Druck- und Strömungsverhältnissen im Außenströmungskanal 10,12 ableiten.To generate a pressure pulse in the drilling fluid, the auxiliary valve 26, 27 is closed due to activation by the measuring device. In the internal flow channel 15 and thus in the pressure chamber 24 builds accordingly a pressure which corresponds to the pressure of the drilling fluid at the level of the inlet opening of the internal flow channel 15. This pressure prevailing in the pressure chamber 24 exerts hydraulic forces directed against the flow direction 4 on the main valve body 8, the sum of which exceeds the sum of the forces acting in the flow direction on the main valve body 8 located in the starting position. The hydraulic forces acting axially in the flow direction 4 on the main valve body 8 are composed of static and dynamic forces which are derived from the pressure and flow conditions in the external flow channel 10, 12.

Unmittelbar nach Schließen des Hilfsventils 26,27 bewegt sich der Hauptventilkörper 8 daher mit einer aus der herrschenden Differenz der Axialkräfte resultierenden Beschleunigung entgegen Strömungsrichtung 4, und mit dieser Bewegung verändern sich die in Strömungsrichtung 4 auf den Hauptventilkörper 8 wirkenden hydraulischen Kräfte, da sich durch die Annäherung des Hauptventilkörpers 8 an die Engstelle 3 der Durchflußquerschnitt und die Strömungsverhältnisse in der Drosselstrecke 12 verändern.Immediately after the auxiliary valve 26, 27 closes, the main valve body 8 therefore moves against the flow direction 4 with an acceleration resulting from the prevailing difference in the axial forces, and with this movement the hydraulic forces acting on the main valve body 8 in the flow direction 4 change, as a result of the Approach of the main valve body 8 to the constriction 3 of the flow cross-section and the flow conditions in the throttle section 12 change.

Bei dem dargestellten Ausführungsbeispiel sind wie bei dem Ventil nach der DE-C-37 15 514 die hydraulisch wirksamen Abmessungen so aufeinander abgestimmt, daß die entgegen Strömungsrichtung 4 Gesamtresultierende aller auf den Hauptventilkörper 8 wirkenden Kräfte zu dem Zeitpunkt, an dem sich der Hauptventilkörper 8 nach dem Schließen des Hilfsventils 26,27 aus seiner Ausgangsstellung aufwärts zu bewegen beginnt, zunächst verhältnismäßig klein ist, dann mit zunehmender Hubweglänge größer wird und schließlich wieder abnimmt, bis sie den Wert Null erreicht. In der Stellung, in der die Gesamtresultierende aller auf den Hauptventilkörper 8 einwirkenden Kräfte den Wert Null hat, nimmt der Hauptventilkörper 8 seine druckpulsbestimmende Betriebsendstellung ein, in der der Hauptventilkörper 8 anschlagsfrei im Bohrspülungsmedium schwebt.In the illustrated embodiment, as with the valve according to DE-C-37 15 514, the hydraulically effective dimensions are coordinated with one another in such a way that the total results against all flow forces acting on the main valve body 8 against the direction of flow 4 at the time when the main valve body 8 follows the closing of the auxiliary valve 26, 27 begins to move upward from its starting position, is initially relatively small, then increases with increasing stroke length and finally decreases again until it reaches the value zero. In the position in which the total resultant of all the forces acting on the main valve body 8 has the value zero, the main valve body 8 assumes its operating pulse position which determines the pressure pulse, in which the main valve body 8 floats in the drilling fluid without a stop.

Nach Öffnen des Hilfsventils 26,27 nimmt der Druck im Druckraum 24 wieder einen Wert an, bei dem die Summe der in Strömungsrichtung 4 auf den Hauptventilkörper 8 wirkenden Kräfte die Summe der entgegen Strömungsrichtung 4 wirkenden Kräfte übersteigt mit der Folge, daß der Hauptventilkörper 8 in seine dargestellte Ausgangsstellung zurückkehrt und für ein erneutes druckpulserzeugendes Arbeitsspiel bereit ist.After opening the auxiliary valve 26, 27, the pressure in the pressure chamber increases 24 again a value at which the sum of the forces acting in the flow direction 4 on the main valve body 8 exceeds the sum of the forces acting against the flow direction 4, with the result that the main valve body 8 returns to its illustrated starting position and is ready for a new pressure pulse generating work cycle .

Claims (8)

  1. A device for generating pressure pulses in a drilling mud medium flowing through a drill pipe (1) for the remote transmission of measured data, with a valve disposed in the drill pipe (1) and which comprises a rigidly supported tubular housing (2), a tubular main valve body (8) disposed coaxially with the housing (2), leaving an outer flow passage (10) and, adapted for displacement axially out of a starting position defined by an abutment (9) and against the direction of flow (4) of the drilling mud into an upper extreme operating position, a tubular carrier body (5) which is rigidly disposed coaxially in the main valve body (8), and an auxiliary valve (26, 27), whereby between a constriction (3) in the housing (2) and the main valve body (8) there is a throttle path (12) in the outer flow passage (10) the through-flow cross-section of which varies as a function of the position of the main valve body (8), the carrier body (5) and the main valve body (8) defining an inner flow passage (15) the inlet aperture of which is central and in the direction of flow (4) is upstream of the constriction (3) in the housing (2) at the end of a tubular extension piece (7) the diameter of which is less than the diameter of the constriction (3) in the housing (2) while its outlet orifice is situated in the region of the root portion (6) of the carrier body (5) and can be opened and closed by means of the auxiliary valve (26, 27), characterised in that the carrier body (5) is provided with the tubular extension (7) which forms a second sliding guide (14) for, engaging around it, the front end (11) of the main valve body (8), a pressure chamber (24) which is connected by passages to the inner flow passage (15) being constructed between the tubular extension (7) of the carrier body (5) and the main valve body (8).
  2. A device according to Claim 1, characterised in that the tubular extension (7) has in the region of the sliding guide (14) for the front end (11) of the main valve body (8) a surfacing reinforcement formed by a hard lining.
  3. A device according to Claim 1 or 2, characterised in that the inlet aperture of the inner flow passage (15) is formed by a number of radially aligned bores (16) provided in an attachment part (17) disposed on the end of the tubular projection (7).
  4. A device according to Claim 3, characterised in that upstream of the bores (16) is a common filter (20) the outer surface of which is coaxial with and substantially aligned in respect of the outer surface of the attachment part (17).
  5. A device according to Claim 4, characterised in that the bores (16) discharge from an annular space (21) disposed behind the filter (20).
  6. A device according to one of Claims 1 to 5, characterised in that between the end of the tubular extension (7) and the region of the sliding guide (14) there is a retaining abutment (19) for the main valve body (8).
  7. A device according to Claim 6, characterised in that the retaining abutment (19) is constituted by the attachment body (17).
  8. A device according to one of Claims 1 to 7, characterised in that the end of the tubular carrier body (5) or of the attachment body (17) is provided with a journal (18) to which a pulling tool can be connected.
EP90110691A 1989-08-16 1990-06-06 Device for creating pressure impulses in drilling mud Expired - Lifetime EP0413097B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3926908A DE3926908C1 (en) 1989-08-16 1989-08-16
DE3926908 1989-08-16

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EP0413097A1 EP0413097A1 (en) 1991-02-20
EP0413097B1 true EP0413097B1 (en) 1993-04-21

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EP90110691A Expired - Lifetime EP0413097B1 (en) 1989-08-16 1990-06-06 Device for creating pressure impulses in drilling mud

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US (1) US5040155A (en)
EP (1) EP0413097B1 (en)
CA (1) CA2023351C (en)
DE (1) DE3926908C1 (en)
NO (1) NO175014C (en)

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US7428922B2 (en) * 2002-03-01 2008-09-30 Halliburton Energy Services Valve and position control using magnetorheological fluids
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US8138943B2 (en) * 2007-01-25 2012-03-20 David John Kusko Measurement while drilling pulser with turbine power generation unit
US7958952B2 (en) * 2007-05-03 2011-06-14 Teledrill Inc. Pulse rate of penetration enhancement device and method
US7836948B2 (en) 2007-05-03 2010-11-23 Teledrill Inc. Flow hydraulic amplification for a pulsing, fracturing, and drilling (PFD) device
US8174929B2 (en) 2007-07-02 2012-05-08 Schlumberger Technology Corporation Spindle for mud pulse telemetry applications
GB0807878D0 (en) * 2008-04-30 2008-06-04 Wavefront Reservoir Technologi System for pulse-injecting fluid into a borehole
MX2010007238A (en) * 2008-01-17 2010-08-13 Wavefront Reservoir Technologi System for pulse-injecting fluid into a borehole.
MX2011006666A (en) * 2008-12-17 2011-09-06 Gabor Vecseri High pressure fast response sealing system for flow modulating devices.
US8720572B2 (en) * 2008-12-17 2014-05-13 Teledrill, Inc. High pressure fast response sealing system for flow modulating devices
US9581267B2 (en) 2011-04-06 2017-02-28 David John Kusko Hydroelectric control valve for remote locations
US9133664B2 (en) 2011-08-31 2015-09-15 Teledrill, Inc. Controlled pressure pulser for coiled tubing applications
US9309762B2 (en) 2011-08-31 2016-04-12 Teledrill, Inc. Controlled full flow pressure pulser for measurement while drilling (MWD) device
US10633968B2 (en) 2011-12-23 2020-04-28 Teledrill, Inc. Controlled pressure pulser for coiled tubing measurement while drilling applications
US9702204B2 (en) 2014-04-17 2017-07-11 Teledrill, Inc. Controlled pressure pulser for coiled tubing measurement while drilling applications
EP3492691A1 (en) 2011-12-23 2019-06-05 Teledrill Inc. Controlled full flow pressure pulser for measurement while drilling (mwd) device
US8534381B1 (en) * 2012-01-06 2013-09-17 Aim Directional Services, LLC High LCM positive pulse MWD component
US9644440B2 (en) 2013-10-21 2017-05-09 Laguna Oil Tools, Llc Systems and methods for producing forced axial vibration of a drillstring
CA2935828C (en) 2015-07-16 2018-06-05 Drilformance Technologies, Llc Hydraulically actuated apparatus for generating pressure pulses in a drilling fluid
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DE3715512C1 (en) * 1987-05-09 1988-10-27 Eastman Christensen Co., Salt Lake City, Utah, Us

Also Published As

Publication number Publication date
NO903578L (en) 1991-02-18
NO175014C (en) 1994-08-17
NO903578D0 (en) 1990-08-15
EP0413097A1 (en) 1991-02-20
CA2023351A1 (en) 1991-02-17
CA2023351C (en) 1996-02-06
DE3926908C1 (en) 1990-10-11
NO175014B (en) 1994-05-09
US5040155A (en) 1991-08-13

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