EP0352427B1 - Drilling device - Google Patents
Drilling device Download PDFInfo
- Publication number
- EP0352427B1 EP0352427B1 EP89109334A EP89109334A EP0352427B1 EP 0352427 B1 EP0352427 B1 EP 0352427B1 EP 89109334 A EP89109334 A EP 89109334A EP 89109334 A EP89109334 A EP 89109334A EP 0352427 B1 EP0352427 B1 EP 0352427B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drilling
- core
- drilling tool
- component unit
- rock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
- E21B25/04—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe the core receiver having a core forming cutting edge or element, e.g. punch type core barrels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
Definitions
- the invention relates to a drilling tool in an embodiment according to the preamble of claim 1, as is known from the older German patent application P 37 01 914.7.
- the invention has for its object to provide a drilling tool that facilitates and accelerates the drilling of stone cores and reduces the cost of obtaining rock samples.
- the invention also aims to provide a simplified and cheaper method for obtaining rock samples, and it achieves this object with the features of claim 6. With regard to further refinements of the method, reference is made to claims 7 to 9.
- the invention enables rock samples to be obtained over a considerable depth of formation without the main borehole having to be drilled after each drilling of a rock core.
- a core hole with a usually much smaller diameter can extend beyond the bottom of the main hole for a length of, for example, one hundred or more meters are driven without having to carry out additional drilling in the meantime.
- the drilling is stopped due to the information provided by the rock samples, there is no need to re-drill, which saves considerable costs.
- the core borehole produced in a core drilling process of the type according to the invention receives a continuous course because the unchanged position of the outer tube of the drilling tool supporting the core drilling device means that the core bores run under constant conditions.
- the outer tube of the drilling tool forms a kind of underground replacement for a shutdown rotary table.
- the insertion of an extension piece in the assembly to be drawn up after each core extraction is extremely simple and quick to carry out, and when removing the extension pieces inserted one after the other after completion of a core drilling process and before re-drilling the main bore, groups of extension pieces can be removed and independently of the unit to be used again be screwed apart.
- the extraction of rock samples according to the invention also makes it possible not only to use the conventional drill bit formed by a roller chisel for re-drilling the main bore, but instead to use a rotary drill bit designed as a solid drilling tool as part of the drilling tool, which combines higher drilling performance with far greater stability and is suitable, save every second round trip required when using drill bits for re-drilling.
- the drilling tool shown in Fig. 1 has an outer tube 1 which can be connected to a drill string, not shown. At the lower end, a roller drill bit 2 is attached, which is used to drill an annular space or the main drill hole for repositioning the outer tube 1.
- a structural unit 3 consisting of a motor 4 and a core drilling device 5. This structural unit 3 is axially displaceable. While the motor 4 is secured against rotating, the core drilling device 5 is rotatably arranged.
- the core drilling device 5 itself consists of a core tube 7 carrying a drill bit 6 and an inner tube 8 rotatably supported therein.
- a drilling fluid distributor 9 is arranged between the motor 4 and the core drilling device 5, which distributes the drilling fluid emerging from the motor 4 into a first flow, which is between the outer tube 1 and the core tube 7 flows, and divides into a further stream between the core tube 7 and the inner tube 8.
- the current flowing between the outer tube 1 and the core tube 7 is controlled by a spring-loaded valve 10 so that it remains the same despite decreasing throttling action of the flow path due to increasing exposure of the core drilling device 5.
- the motor 4 is provided with a collar 11 which fills the annular space between its housing and the outer tube 1.
- the collar 11 is sealed with respect to the outer tube 1 and, with further housing areas of the motor 4, forms partial areas which are the cross-sectional area fill an inner passage area 12 of the outer tube 1.
- a catching device 13 is provided, which is used to pull out the entire structural unit 3 after drilling a core.
- the catching device 13 serves as a means for adjusting the axial feed force by opposing the core drilling device 5 with a retaining force which is fed to it via a cable 14 leading through the drill string by means of a winch located on the drilling tower.
- values between a maximum value and zero can be set for the resulting axial feed force. The maximum value is obtained when the axial feed force is determined at an undiminished level by the drilling fluid pressure above the assembly 3 in connection with the reaction surfaces.
- the outer tube 1 is provided in its upper region with a longitudinal groove profile 30 illustrated at 30. Near its upper end, the structural unit 3 has a wedge region 31 which is in rotationally locking engagement with the longitudinal groove region 30 of the outer tube 1.
- connection means 32, 33 and 34, 35 which, as in the exemplary embodiments shown, are preferably designed as screw threads.
- the parts of the assembly can either be directly connected via their connecting means 32, 33 or 34, 35 or connected via extension pieces 36 or 37, which are preferably designed as tubular bodies and are provided with corresponding connecting means at their ends.
- the separation point between the catching device 13 and the upper end of the motor 4, but there is also the possibility of the separation point 2 in the upper region of the core drill pipe 7 between its connection to the motor 4 and the bearing device 38 for the inner pipe 8.
- the length of the extension pieces 36 and 37 shown broken off preferably corresponds at least substantially to the length of the core receiving space of the inner tube 8.
- extension pieces 36 and 37 can be interposed between the connection means 32, 33 and 34, 35, so that during a core drilling process a corresponding number of rock cores can be drilled and brought to light in immediate succession until a re-drilling the main hole is required.
- the number of interchangeable extension pieces 36; 37 and thus the length of a drivable core borehole essentially depends on material strength, type of rock formations and, if applicable, the length over which a main bore can be drilled using the drill bit 2 or a solid drilling tool used instead of this, until a round trip is required for the entire drill string due to wear of the drill bit or the rotary drill bit used as a solid drilling tool.
Description
Die Erfindung betrifft ein Bohrwerkzeug in einer Ausgestaltung gemäß dem Oberbegrifff des Anspruchs 1, wie es aus der älteren deutschen Patentanmeldung P 37 01 914.7 bekannt ist.The invention relates to a drilling tool in an embodiment according to the preamble of
Der Erfindung liegt die Aufgabe zugrunde, ein Bohrwerkzeug zu schaffen, das das Erbohren von Gesteinskernen erleichtert und beschleunigt sowie die Kosten für die Gewinnung von Gesteinsproben mindert.The invention has for its object to provide a drilling tool that facilitates and accelerates the drilling of stone cores and reduces the cost of obtaining rock samples.
Die Erfindung löst diese Aufgabe mit den Merkmalen des Anspruchs 1. Hinsichtlich weiterer Ausgestaltungen wird auf die Ansprüche 2 bis 5 verwiesen.The invention solves this problem with the features of
Die Erfindung bezweckt ferner die Schaffung eines vereinfachten und verbilligten Verfahrens zur Gewinnung von Gesteinsproben, und sie löst diese Aufgabe mit den Merkmalen des Anspruchs 6. Hinsichtlich weiterer Ausgestaltungen des Verfahrens wird auf die Ansprüche 7 bis 9 verwiesen.The invention also aims to provide a simplified and cheaper method for obtaining rock samples, and it achieves this object with the features of
Die Erfindung ermöglicht es, Gesteinsproben über eine erhebliche Formationstiefe zu gewinnen, ohne daß nach jedem Erbohren eines Gesteinskerns das Hauptbohrloch nachgebohrt werden muß. Eine Kernbohrung mit üblicherweise wesentlich geringerem Durchmesser kann dabei über die Sohle des Hauptbohrloches hinaus an einer Länge von beispielsweise hundert oder mehr Meter vorgetrieben werden, ohne zwischenzeitlich Nachbohrarbeiten auszuführen. In Fällen, in denen aufgrund der durch die Gesteinsproben vermittelten Informationen die Bohrung abgebrochen wird, erübrigt sich ein Nachbohren, wodurch erhebliche Kosten eingespart werden. Zugleich verringert sich die Bohrzeit, auch dann, wenn ein Nachbohren im Zuge des Fortsetzens des Bohrvorhabens erforderlich wird, weil eine Nachbohrung über eine Strecke, die einem Vielfachen einer Kernlänge entspricht, schneller ausführbar ist als eine Vielzahl von Nachbohrvorgängen über Bohrstrecken von Kernlängen. Das bei einem Kernbohrvorgang erfindungsgemäßer Art erzeugte Kernbohrloch erhält einen kontinuierlichen Verlauf, weil durch die unveränderte Stellung des die Kernbohreinrichtung abstützenden Außenrohres des Bohrwerkzeugs die Kernbohrungen unter gleichbleibenden Bedingungen ablaufen. Das Außenrohr des Bohrwerkzeugs bildet dabei gewissermaßen einen unter Tage befindlichen Ersatz für einen stillgesetzten Drehtisch.The invention enables rock samples to be obtained over a considerable depth of formation without the main borehole having to be drilled after each drilling of a rock core. A core hole with a usually much smaller diameter can extend beyond the bottom of the main hole for a length of, for example, one hundred or more meters are driven without having to carry out additional drilling in the meantime. In cases where the drilling is stopped due to the information provided by the rock samples, there is no need to re-drill, which saves considerable costs. At the same time, the drilling time is reduced, even if re-drilling becomes necessary in the course of the continuation of the drilling project, because re-drilling over a distance that is a multiple of a core length can be carried out faster than a large number of re-drilling operations over drilling distances of core lengths. The core borehole produced in a core drilling process of the type according to the invention receives a continuous course because the unchanged position of the outer tube of the drilling tool supporting the core drilling device means that the core bores run under constant conditions. The outer tube of the drilling tool forms a kind of underground replacement for a shutdown rotary table.
Das Einfügen eines Verlängerungsstückes in der nach jeder Kerngewinnung aufzuziehenden Baueinheit ist außerordentlich einfach und schnell durchführbar, und beim Entfernen der hintereinander eingefügten Verlängerungsstücke nach Abschluß eines Kernbohrvorganges und vor einem Nachbohren der Hauptbohrung können jeweils Gruppen von Verlängerungsstücke entfernt und unabhängig von der wieder zum Einsatz kommenden Baueinheit auseinandergeschraubt werden. Die erfindungsgemäße Gewinnung von Gesteinsproben ermöglicht es auch, zum Nachbohren der Hauptbohrung nicht nur die übliche von einem Rollenmeißel gebildete Bohrkrone zu verwenden, sondern stattdessen einen als Vollbohrwerkzeug ausgebildeten Drehbohrmeißel als Bestandteil des Bohrwerkzeugs einzusetzen, der höhere Bohrleistungen mit weitaus höherer Standfestigkeit verbindet und geeignet ist, jeden zweiten bei Einsatz von Bohrkronen für das Nachbohren erforderlichen Roundtrip einzusparen.The insertion of an extension piece in the assembly to be drawn up after each core extraction is extremely simple and quick to carry out, and when removing the extension pieces inserted one after the other after completion of a core drilling process and before re-drilling the main bore, groups of extension pieces can be removed and independently of the unit to be used again be screwed apart. The extraction of rock samples according to the invention also makes it possible not only to use the conventional drill bit formed by a roller chisel for re-drilling the main bore, but instead to use a rotary drill bit designed as a solid drilling tool as part of the drilling tool, which combines higher drilling performance with far greater stability and is suitable, save every second round trip required when using drill bits for re-drilling.
Zur Änderung der Länge erbohrbarer Kerne ist es bekannt (US-A-3 485 310), das Außen- und das Innenrohr eines Kernbohrwerkzeugs mit aufziehbarer Innenrohreinheit durch Einfügen bzw. Entfernen von Zwischenrohrsegmenten zu verändern.To change the length of drillable cores, it is known (US Pat. No. 3,485,310) to change the outer and inner tubes of a core drilling tool with a retractable inner tube unit by inserting or removing intermediate tube segments.
Weitere Einzelheiten und Vorteile ergeben sich aus der nachfolgenden Beschreibung und der Zeichnung, in der zwei Ausführungsbeispiele des Gegenstandes der Erfindung näher veranschaulicht sind. In der Zeichnung zeigen:
- Fig. 1
- einen schematischen Längsschnitt durch eine erste Ausführung eines erfindungsgemäßen Kernbohrwerkzeuges zu Beginn eines Kernbohrvorganges, und
- Fig. 2
- eine Darstellung ähnlich Fig. 1 einer zweiten Ausführung des Kernbohrwerkzeuges nach der Erfindung am Ende eines Kernbohrwerkzeuges.
- Fig. 1
- a schematic longitudinal section through a first embodiment of a core drilling tool according to the invention at the beginning of a core drilling process, and
- Fig. 2
- a representation similar to FIG. 1 of a second embodiment of the core drilling tool according to the invention at the end of a core drilling tool.
Das in Fig. 1 dargestellte Bohrwerkzeug besitzt ein Außenrohr 1, welches mit einem nichtdargestellten Bohrstrang verbindbar ist. Am unteren Ende ist eine Rollenbohrkrone 2 angebracht, die zum Aufbohren eines Ringraums bzw. des Hauptbohrloches für das Nachsetzen des Außenrohrs 1 dient. Innerhalb des Außenrohrs 1 befindet sich eine Baueinheit 3 bestehend aus einem Motor 4 und einer Kernbohreinrichtung 5. Diese Baueinheit 3 ist axial verschiebbar. Während der Motor 4 gegen Mitdrehen gesichert ist, ist die Kernbohreinrichtung 5 drehbar angeordnet. Die Kernbohreinrichtung 5 selbst besteht aus einem eine Bohrkrone 6 tragenden Kernrohr 7 und einem darin drehbar abgestützten Innenrohr 8. Zwischen dem Motor 4 und der Kernbohreinrichtung 5 ist ein Bohrspülungsverzweiger 9 angeordnet, der die aus dem Motor 4 austretende Bohrspülung in einen ersten Strom, der zwischen dem Außenrohr 1 und dem Kernrohr 7 fließt, und in einen weiteren Strom zwischen dem Kernrohr 7 und dem Innenrohr 8 aufteilt. Der zwischen dem Außenrohr 1 und dem Kernrohr 7 fließende Strom wird durch ein federbelastetes Ventil 10 so gesteuert, daß er trotz abnehmender Drosselwirkung des Strömungsweges infolge zunehmender Exposition der Kernbohreinrichtung 5 gleich bleibt.The drilling tool shown in Fig. 1 has an
Um eine unerwünschte Umgehung des Motors 4 durch die Bohrspülung zu verhindern, ist der Motor 4 mit einen Kragen 11, der den Ringraum zwischen seinem Gehäuse und dem Außenrohr 1 ausfüllt, versehen. Der Kragen 11 ist gegenüber dem Außenrohr 1 abgedichtet und bildet mit weiteren Gehäusebereichen des Motors 4 Teilflächen, die die Querschnittsfläche eines inneren Durchgangsbereichs 12 des Außenrohrs 1 ausfüllen. Diese Teilflächen ergeben die Reaktionsflächen des über der Einheit 3 anstehenden Bohrspülungsdrucks und erzeugen die Axialvorschubkraft für die Baueinheit 3.In order to prevent undesired bypassing of the motor 4 by the drilling fluid, the motor 4 is provided with a
Im oberen Bereich des Motors 4 ist eine Fangeinrichtung 13 vorgesehen, die zum Herausziehen der gesamten Baueinheit 3 nach Erbohren eines Kerns dient. Die Fangeinrichtung 13 dient als Mittel zur Einstellung der Axialvorschubkraft, indem sie der Kernbohreinrichtung 5 eine Rückhaltekraft entgegensetzt, die ihr über ein durch den Bohrstrang führendes Seil 14 mittels einer am Bohrturm befindlichen Winde zugeführt wird. Je nach Höhe der Rückhaltekraft sind für die resultierende Axialvorschubkraft Werte zwischen einem Maximalwert und Null einstellbar. Der Maximalwert ergibt sich dann, wenn die Axialvorschubkraft in unverminderter Höhe durch den über der Baueinheit 3 anstehenden Bohrspülungsdruck in Verbindung mit den Reaktionsflächen bestimmt wird.In the upper area of the motor 4, a
Das Außenrohr 1 ist in seinem oberen Bereich mit einem bei 30 veranschaulichten Längsnutprofil 30 versehen. Nahe ihrem oberen Ende weist die Baueinheit 3 einen Keilbereich 31 auf, der mit dem Längsnutbereich 30 des Außenrohres 1 in Drehsicherungseingriff steht.The
Unterhalb dieses Keilstücks 31 befindet sich eine Trennstelle mit einander zugewandten Anschlußmitteln 32, 33 bzw. 34, 35, die wie bei den dargestellten Ausführungsbeispielen bevorzugt als Schraubgewinde ausgebildet sind. An dieser Trennstelle können die Teile der Baueinheit über ihre Anschlußmittel 32, 33 bzw. 34, 35 entweder unmittelbar verbunden sein oder über Verlängerungsstücke 36 bzw. 37 verbunden werden, die vorzugsweise als Rohrkörper ausgebildet und an ihren Enden mit entsprechenden Anschlußmitteln versehen sind.Below this
Bei der Ausführung nach Fig. 1 befindet sich die Trennstelle zwischen der Fangeinrichtung 13 und dem oberen Ende des Motors 4, jedoch besteht auch die Möglichkeit, die Trennstelle gemäß der Ausführung nach Fig. 2 im oberen Bereich des Kernbohrrohres 7 zwischen dessen Verbindung mit dem Motor 4 und der Lagervorrichtung 38 für das Innenrohr 8 anzuordnen. Die Länge der abgebrochen dargestellten Verlängerungsstücke 36 bzw. 37 entspricht bevorzugt zumindest im wesentlichen der Länge des Kernaufnahmeraumes des Innenrohres 8.In the embodiment according to FIG. 1 there is the separation point between the
Im Verlaufe eines Kernbohrvorganges können eine Mehrzahl von Verlängerungsstücken 36 bzw. 37 zwischen die Anschlußmittel 32, 33 bzw. 34, 35 zwischengesetzt werden, so daß während eines Kernbohrvorganges eine entsprechende Mehrzahl von Gesteinskernen in unmittelbarer Aufeinanderfolge erbohrt und zutage gefördert werden können, bis ein Nachbohren der Hauptbohrung erforderlich wird. Die Anzahl von zwischensetzbaren Verlängerungsstücken 36;37 und damit die Länge eines vortreibbaren Kernbohrloches hängt im wesentlichen von Materialfestigkeiten, Art der Gesteinsformationen und ggfs. davon ab, über welche Länge eine Hauptbohrung mit Hilfe der Bohrkrone 2 oder eines statt dieser verwendeten Vollbohrwerkzeugs nachgebohrt werden kann, bis wegen Verschleiß der Bohrkrone oder des als Vollbohrwerkzeug Verwendung findenden Drehbohrmeißels ein Roundtrip für den gesamten Bohrstrang erforderlich wird.In the course of a core drilling process, a plurality of
Claims (9)
- A drilling tool consisting of an outer tube (1) adapted for connection to a drill string and, non-rotatably but axially displaceably disposed in the outer tube (1), a component unit (3) having reaction surfaces subject to the pressure of the drilling mud for generating an axial thrust force acting on the component unit (3) in the direction of the well bottom, and with means for its adjustment, in which the component unit (3) comprises core drilling means (5) which in turn has, carrying a drill bit (6), a rotatably driven core barrel (7) and an inner tube (8) supported therein in freely rotatable manner, a motor (4) driven by drilling mud and coupled with the core drilling means (5), and a catching means (13) for raising the component unit (3), characterised in that the component unit (3) comprises, below the area (31) of its rotation-locking engagement with the outer tube (1) and above the device for mounting the inner tube (8), a point of separation with mutually facing connecting means (32, 33; 34, 35), between which it is possible to introduce the at least one tubular extension piece (36; 37) for the component unit (3).
- A drilling tool according to Claim 1, characterised in that the point of separation is disposed between the catching means (13) and the motor (4).
- A drilling tool according to Claim 1, characterised in that the point of separation is disposed in the upper part of the core barrel (7) between its connection to the motor (4) and the device (38) for mounting the inner tube (8).
- A drilling tool according to one of Claims 1 to 3, characterised in that provided as a connecting means are screw threads (32, 33; 34, 35) which can be connected either directly to one another or respectively to corresponding screw threads on the ends of the extension pieces (36; 37).
- A drilling tool according to one of Claims 1 to 4, characterised in that the extension pieces (36; 37) are of a length which corresponds substantially to the length of the core-receiving space in the inner tube (8), its outside diameter being thereby one which corresponds to the outside diameter of the component unit (3) in the region of the points of separation.
- A method of extracting rock samples from a main underground bore hole created by a drilling tool, wherein by a separately and directly driven core drilling means of reduced diameter and adapted to be advanced axially out of the drilling tool, cylindrical rock cores can be drilled out and conveyed to the surface by a raising of the core drilling means and wherein after the core drilling process the main bore hole is re-drilled by the drilling tool, characterised in that after raising of the core drilling means with a rock core contained therein, the core drilling means is lengthened in the region above the space for accommodating a drilled out core by the insertion of an extension piece and after the core drilling means has been lowered into the drilling tool a next rock core is drilled out directly and in that the main bore hole is only re-drilled after a plurality of rock cores have been extracted one after another.
- A method according to Claim 6, characterised in that re-drilling of the main bore takes place after in each case a successive extraction of 15 to 30 rock cores.
- A method according to Claim 6 or 7, characterised in that a drill bit is used for re-drilling the main bore.
- A method according to Claim 6 or 7, characterised in that instead of the drill bit as a constituent part of the drilling tool, a rotary drilling bit constructed as a complete drilling tool is used for re-drilling the main bore.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3825225 | 1988-07-25 | ||
| DE3825225A DE3825225A1 (en) | 1988-07-25 | 1988-07-25 | DRILLING TOOL |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0352427A2 EP0352427A2 (en) | 1990-01-31 |
| EP0352427A3 EP0352427A3 (en) | 1991-05-15 |
| EP0352427B1 true EP0352427B1 (en) | 1994-03-02 |
Family
ID=6359498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89109334A Expired - Lifetime EP0352427B1 (en) | 1988-07-25 | 1989-05-24 | Drilling device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4969528A (en) |
| EP (1) | EP0352427B1 (en) |
| CA (1) | CA1320944C (en) |
| DE (1) | DE3825225A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3902869C1 (en) * | 1989-02-01 | 1990-04-12 | Eastman Christensen Co., Salt Lake City, Utah, Us | |
| NL1016545C2 (en) * | 2000-11-03 | 2002-05-07 | Fugro Eng Bv | A rotatable core drilling device and a rotatable core drilling system equipped with such a rotatable core drilling device. |
| US6729416B2 (en) | 2001-04-11 | 2004-05-04 | Schlumberger Technology Corporation | Method and apparatus for retaining a core sample within a coring tool |
| DE20107024U1 (en) * | 2001-04-24 | 2001-07-26 | Hilti Ag | Tool to remove a core |
| US7431107B2 (en) * | 2003-01-22 | 2008-10-07 | Schlumberger Technology Corporation | Coring bit with uncoupled sleeve |
| US7562725B1 (en) * | 2003-07-10 | 2009-07-21 | Broussard Edwin J | Downhole pilot bit and reamer with maximized mud motor dimensions |
| US20050133267A1 (en) * | 2003-12-18 | 2005-06-23 | Schlumberger Technology Corporation | [coring tool with retention device] |
| US7762328B2 (en) * | 2006-09-29 | 2010-07-27 | Baker Hughes Corporation | Formation testing and sampling tool including a coring device |
| CN101769135B (en) * | 2010-01-07 | 2012-10-17 | 中国地质大学（武汉） | Blocking ball device for horizontal well core drill |
| EP2569504B1 (en) * | 2010-02-03 | 2019-11-06 | 1461160 Alberta Ltd | System and method for conducting drilling and coring operations |
| US8739899B2 (en) * | 2010-07-19 | 2014-06-03 | Baker Hughes Incorporated | Small core generation and analysis at-bit as LWD tool |
| US8613330B2 (en) | 2011-07-05 | 2013-12-24 | Schlumberger Technology Corporation | Coring tools and related methods |
| US9752411B2 (en) | 2013-07-26 | 2017-09-05 | National Oilwell DHT, L.P. | Downhole activation assembly with sleeve valve and method of using same |
| US9494004B2 (en) | 2013-12-20 | 2016-11-15 | National Oilwell Varco, L.P. | Adjustable coring assembly and method of using same |
| US11506001B2 (en) | 2020-12-31 | 2022-11-22 | Rus-Tec Engineering, Ltd. | System and method of obtaining formation samples using coiled tubing |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2898086A (en) * | 1954-12-02 | 1959-08-04 | Jersey Prod Res Co | Method of drilling |
| US2910273A (en) * | 1956-01-19 | 1959-10-27 | Neyrpic Ets | Corer for turbine driven well drilling units |
| US2915285A (en) * | 1956-05-23 | 1959-12-01 | Jersey Prod Res Co | Coring subterranean formations |
| US2944792A (en) * | 1956-05-28 | 1960-07-12 | Neyrpic Ets | Turbines for drilling and coring |
| US3485310A (en) * | 1968-01-22 | 1969-12-23 | Vincent Milosevich | Wire line core barrel apparatus |
| US3903975A (en) * | 1972-08-23 | 1975-09-09 | Tigre Tierra | Drilling apparatus with down-the-hole motor |
| US3990524A (en) * | 1974-06-03 | 1976-11-09 | Tigre Tierra, Inc. | Down-the-hole motor for rotary drill rod and process for drilling using the same |
| DE2919007C2 (en) * | 1979-05-11 | 1982-07-22 | Christensen, Inc., 84115 Salt Lake City, Utah | Core drilling equipment for rock boreholes |
| US4518050A (en) * | 1983-06-30 | 1985-05-21 | Chevron Research Company | Rotating double barrel core sampler |
| DE3613265A1 (en) * | 1986-04-19 | 1987-10-22 | Christensen Inc Norton | CORE DRILLING TOOL FOR STONE DRILLING |
| DE3701914C1 (en) * | 1987-01-23 | 1988-05-19 | Eastman Christensen Co | Directly driven core drilling tool |
| DE3729138A1 (en) * | 1987-09-01 | 1989-04-20 | Bergbau Bohrgesellschaft Rhein | Method and drilling rig for producing underground transverse bores, in particular horizontal core bores for obtaining soil samples, from the surface |
-
1988
- 1988-07-25 DE DE3825225A patent/DE3825225A1/en active Granted
-
1989
- 1989-05-24 EP EP89109334A patent/EP0352427B1/en not_active Expired - Lifetime
- 1989-07-18 US US07/381,489 patent/US4969528A/en not_active Expired - Fee Related
- 1989-07-24 CA CA000606476A patent/CA1320944C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE3825225C2 (en) | 1991-05-23 |
| DE3825225A1 (en) | 1990-02-01 |
| EP0352427A3 (en) | 1991-05-15 |
| EP0352427A2 (en) | 1990-01-31 |
| CA1320944C (en) | 1993-08-03 |
| US4969528A (en) | 1990-11-13 |
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