DE29821854U1 - Double drill pipe - Google Patents

Double drill pipe

Info

Publication number
DE29821854U1
DE29821854U1 DE29821854U DE29821854U DE29821854U1 DE 29821854 U1 DE29821854 U1 DE 29821854U1 DE 29821854 U DE29821854 U DE 29821854U DE 29821854 U DE29821854 U DE 29821854U DE 29821854 U1 DE29821854 U1 DE 29821854U1
Authority
DE
Germany
Prior art keywords
drill pipe
double drill
inner tube
pipe according
tube
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
Application number
DE29821854U
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE29821854U priority Critical patent/DE29821854U1/en
Publication of DE29821854U1 publication Critical patent/DE29821854U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/18—Pipes provided with plural fluid passages

Description

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßtThe description text was not recorded electronically

Claims (8)

1. Doppelbohrrohr mit einem Außenrohr (11) und einem darin angeordneten Innenrohr (20), wobei das Außenrohr und das Innenrohr relativ zueinander drehbar sind und axial zusam­ menwirkende Blockierteile (24, 25; 26, 27) aufweisen, welche so angeordnet sind, daß das Innenrohr (20) in Grenzen ver­ schiebbar ist, dadurch gekennzeichnet, daß das Innenrohr (20) in dem Außenrohr (11) unverlierbar enthalten ist, und daß das axiale Spiel (a + b) des Innen­ rohres (20) kleiner ist als die Überlappungslänge (c) zweier miteinander verbundener Innenrohre (20).1. Double drill pipe with an outer tube ( 11 ) and an inner tube ( 20 ) arranged therein, the outer tube and the inner tube being rotatable relative to one another and having axially interacting blocking parts ( 24 , 25 ; 26 , 27 ) which are arranged such that the inner tube ( 20 ) can be pushed ver within limits, characterized in that the inner tube ( 20 ) is captively contained in the outer tube ( 11 ) and that the axial play (a + b) of the inner tube ( 20 ) is smaller than that Overlap length (c) of two interconnected inner tubes ( 20 ). 2. Doppelbohrrohr nach Anspruch 1, dadurch gekennzeichnet, daß das Innenrohr an beiden Enden komplementäre Steckver­ binder (21, 22) aufweist.2. Double drill pipe according to claim 1, characterized in that the inner pipe has complementary fastex binder ( 21 , 22 ) at both ends. 3. Doppelbohrrohr nach Anspruch 1 oder 2, dadurch gekenn­ zeichnet, daß das Außenrohr (11) einen Rohrkörper (12) aufweist, der an mindestens einem Ende mit einer Rohrmuffe (13, 14) abgeschlossen ist.3. Double drill pipe according to claim 1 or 2, characterized in that the outer pipe ( 11 ) has a tubular body ( 12 ) which is closed at at least one end with a pipe sleeve ( 13 , 14 ). 4. Doppelbohrrohr nach Anspruch 3, dadurch gekennzeichnet, daß der Rohrkörper (12) an beiden Enden jeweils mit einer Rohrmuffe (13, 14) abgeschlossen ist, und daß die Rohrmuf­ fen benachbarter Außenrohre (11a, 11b) miteinander ver­ schraubbar sind.4. Double drill pipe according to claim 3, characterized in that the tubular body ( 12 ) is closed at both ends with a pipe sleeve ( 13 , 14 ), and that the Rohrmuf fen adjacent outer pipes ( 11 a, 11 b) are screwed together ver. 5. Doppelbohrrohr nach Anspruch 4, dadurch gekennzeichnet, daß der Rohrkörper (12) an beiden Enden gleiche Muffenan­ schlußteile aufweist. 5. Double drill pipe according to claim 4, characterized in that the tubular body ( 12 ) has the same sleeve parts at both ends. 6. Doppelbohrrohr nach einem der Ansprüche 3-5, dadurch ge­ kennzeichnet, daß die Rohrmuffe (13, 14) eine Anschlag­ schulter (24, 26) für radiale Ansätze (25, 27) des Innenroh­ res (20) aufweist.6. Double drill pipe according to one of claims 3-5, characterized in that the pipe sleeve ( 13 , 14 ) has a stop shoulder ( 24 , 26 ) for radial approaches ( 25 , 27 ) of the inner tube res ( 20 ). 7. Doppelbohrrohr nach einem der Ansprüche 1-6, dadurch ge­ kennzeichnet, daß der Innendurchmesser des Innenrohres (20) mindestens 25%, vorzugsweise mindestens 70%, des Innendurchmessers des Außenrohres (11) beträgt.7. Double drill pipe according to one of claims 1-6, characterized in that the inner diameter of the inner tube ( 20 ) is at least 25%, preferably at least 70%, of the inner diameter of the outer tube ( 11 ). 8. Doppelbohrrohr nach einem der Ansprüche 1-7, dadurch ge­ kennzeichnet, daß das Innenrohr (20) in keiner Stellung aus dem Außenrohr (11) heraus vorsteht.8. Double drill pipe according to one of claims 1-7, characterized in that the inner tube ( 20 ) does not protrude from the outer tube ( 11 ) in any position.
DE29821854U 1998-12-08 1998-12-08 Double drill pipe Expired - Lifetime DE29821854U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29821854U DE29821854U1 (en) 1998-12-08 1998-12-08 Double drill pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE29821854U DE29821854U1 (en) 1998-12-08 1998-12-08 Double drill pipe

Publications (1)

Publication Number Publication Date
DE29821854U1 true DE29821854U1 (en) 2000-04-20

Family

ID=8066343

Family Applications (1)

Application Number Title Priority Date Filing Date
DE29821854U Expired - Lifetime DE29821854U1 (en) 1998-12-08 1998-12-08 Double drill pipe

Country Status (1)

Country Link
DE (1) DE29821854U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635317A (en) * 2012-04-27 2012-08-15 中国地质大学（武汉） Anti-burying drill rod during collapse of well wall

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065807A (en) * 1958-06-30 1962-11-27 Gas Drilling Services Co Dual passage well drilling pipe
DE4211081C1 (en) * 1992-04-03 1993-09-16 Ing. G. Klemm Bohrtechnik Gmbh, 57489 Drolshagen, De Multiple drill pipe - allows limited inner pipe projection to facilitate coupling to other drill pipes
DE19718897A1 (en) * 1997-05-03 1998-11-05 Pumpenboese Stahl Gmbh & Co Kg Double-walled pipe for drilling wells in geological structures

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065807A (en) * 1958-06-30 1962-11-27 Gas Drilling Services Co Dual passage well drilling pipe
DE4211081C1 (en) * 1992-04-03 1993-09-16 Ing. G. Klemm Bohrtechnik Gmbh, 57489 Drolshagen, De Multiple drill pipe - allows limited inner pipe projection to facilitate coupling to other drill pipes
DE19718897A1 (en) * 1997-05-03 1998-11-05 Pumpenboese Stahl Gmbh & Co Kg Double-walled pipe for drilling wells in geological structures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635317A (en) * 2012-04-27 2012-08-15 中国地质大学（武汉） Anti-burying drill rod during collapse of well wall
CN102635317B (en) * 2012-04-27 2014-07-02 中国地质大学（武汉） Anti-burying drill rod during collapse of well wall

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Legal Events

Date Code Title Description
R163 Identified publications notified
R207 Utility model specification

Effective date: 20000525

R156 Lapse of ip right after 3 years

Effective date: 20020702