WO1997049891A1 - Tube de forage destine a la formation de trains de tiges - Google Patents

Tube de forage destine a la formation de trains de tiges Download PDF

Info

Publication number
WO1997049891A1
WO1997049891A1 PCT/SE1997/001085 SE9701085W WO9749891A1 WO 1997049891 A1 WO1997049891 A1 WO 1997049891A1 SE 9701085 W SE9701085 W SE 9701085W WO 9749891 A1 WO9749891 A1 WO 9749891A1
Authority
WO
WIPO (PCT)
Prior art keywords
drill
valve body
seat
restriction
tube
Prior art date
Application number
PCT/SE1997/001085
Other languages
English (en)
Inventor
Per-Olof Liljebrand
Urban Olsson
Rainer Beccu
Original Assignee
Sandvik Ab (Publ)
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 Sandvik Ab (Publ) filed Critical Sandvik Ab (Publ)
Priority to AU32821/97A priority Critical patent/AU712137B2/en
Priority to EP97928611A priority patent/EP0907820B1/fr
Priority to CA002258164A priority patent/CA2258164C/fr
Priority to AT97928611T priority patent/ATE257214T1/de
Priority to DE69727056T priority patent/DE69727056D1/de
Publication of WO1997049891A1 publication Critical patent/WO1997049891A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems

Definitions

  • This invention relates to a drill tube for forming drill strings, comprising a through channel intended for passing flushing liquid, inside of which there is a restriction which forms a seat for a valve body serving as a check valve
  • the invention further relates to a valve body per se
  • Drill strings composed of such drill tubes are in practice often used for percussive top hammer drilling, the drill string having the purpose of transferring percussion energy from a top hammer to a drill bit in the free end of the drill string
  • the individual drill tube usually has a female thread formed at an end intended to receive a male thread at an opposite end of another drill tube
  • These threads are formed at production in particular end pieces in which reduced or necked sections of the flushing liquid channel are included, the end pieces being joined to a longer tube having a larger cross-section area, by friction welding
  • a drill tube of the kind initially referred to is previously disclosed in EP- B-0 126 740 (see particularly figures 4 to 9)
  • water possibly together with certain additives, e g to improve the greasing is usually used as a flushing liquid
  • the d ⁇ ll tubes are of a relatively large inner diameter, the channel of each tube holds a considerable amount of flushing liquid
  • the drill string is elongated by means of further d ⁇ ll tubes which are connected to the drill string by the above- mentioned threaded joints
  • the drill string When drilling in rocks, the drill string may not only be directed downwards but also upwards as well as substantially horizontally
  • the flushing liquid remains in the individual drill tube of the d ⁇ ll string when a new drill tube is to be connected because otherwise the entire channel in the drill string would first have to be emptied and then be refilled with flushing liquid in connection with each shift occasion
  • a check valve has previously been arranged in the type of drill tubes which are used for drilling in the direction upwards More precisely, a ball which is allowed to abut against the lower reduction of the individual drill tube has been used for this purpose
  • flushing liquid is fed in with a relatively high pressure in the lower end of the drill tube, the ball will be lifted and float in the liquid column inside the tube, the liquid being able to pass freely out through the opposite, upper end of the tube
  • an annoying disadvantage of this kind of check valve is that drill tubes with a permanent built-in valve ball can only be used for drilling in the direction upward
  • a primary object of the invention is to create a drill tube which may be used for upwardly directed as well as downwardly directed drilling and, on one side, has a reliably working check valve function at upwardly directed drilling at the same time as the tube, at downwardly directed drilling, admits a free flow of flushing liquid through the flushing liquid channel
  • the drill tube should be able to be used universally for drilling in all arbitrary directions
  • a check valve arrangement at a connection between two tubes, the connection between the tubes being achieved by friction welding, is previously known in SE-B-456 269
  • the arrangement includes a ball and a holder which is mounted in connection with an internal welding bead which is formed in connec- tion with the friction welding, the holder being axially locked by said bead
  • Fig 1 is a view of a drill tube according to the invention shown partly in a longitudinal section, the tube being shown in a cut state
  • Fig 2 is an enlarged section A-A in Fig 1
  • Fig 3 is a view corresponding to Fig 1 showing an alternative embodiment of the invention
  • reference numeral 1 generally designates a drill tube which is composed of two end pieces 2, 3 and a proper tube part 4, positioned therebetween A cavity 5 with a schematically shown internal thread or female thread 6 is recessed in the first-mentioned end piece 2
  • the opposite end piece 3 has a male-like spigot 7 on the outside of which an external thread or male thread designated 8 is formed
  • the end pieces 2, 3 are connected to the intermediate tube part 4 via conventional friction weldings 9
  • Such welding seams are produced by bringing two metal bodies adjoining each other to rotate relative to each other while gradually increasing the temperature in the interface between the bodies, the bodies being pressed together when the material in the interface has obtained an appropriate temperature (around 1 200°C)
  • beads designated 10 and 10' respectively are formed on the inside of the tube walls
  • the first end piece 2 has a cavity 11 turned towards the tube part 4 which communicates with the cavity 5 via a restricted channel section 12 delimited by a ring-formed material portion 13 on the inside of the otherwise tubular end piece 2
  • a cone-shaped surface 14 constitutes a transition between the cavity 1 1 and the channel section 12
  • the second end piece 3 comprises a cavity 11' turned towards the tube part 4 which, via a cone-shaped or otherwise narrowing surface 14' transform into a restricted channel section 12' having a smaller diameter than the cavity 11 Said channel section 12' extend the whole way through the male-like portion 7
  • the inner diameter of the cavities 11 , 11' correspond to the inner diameter of the proper tube part 4
  • the shown drill tube may have a length within the range of 1 ,5 - 2 meter and an outer diameter within the range of 50 - 100 mm Then the inner diameter of the proper tube part amounts to about 2/3 of the outer diameter of the tube part (for e g a tube having the outer diameter 90 mm, the inner diameter is approx 60 mm)
  • the through flushing liquid channel which is formed by the cavity in the tube part 4 as well as the cavities 11 , 11' and the restricted sections 12, 12' in the end pieces 2, 3 is in its entirety designated 15 in Fig 1 As far as the shown drill tube has been described hitherto, the same is in all essentials previously known
  • a check valve, in its entirety designated 16, which includes a front skittle member 17 as well as a shaft 18 extending backwards therefrom is arranged in the channel 15
  • the free end portion in the very front of the skittle member 17 has, in the shown example, a partially spherical surface 19 which may turn into a sealing engagement with the cone surface 14 serving as a seat
  • the skittle member 17 is in other respects in all essentials cylinder-shaped
  • the front end portion may also be cone-shaped (e g for a sharp-edged seat)
  • the shaft 18 includes a central portion 20 from which three wings 21 serving as blocking elements protrude between which equally many grooves or cavities designated 22 are delimited
  • the rounded bottoms of said grooves designated 23 extend not only along the shaft but also along the major part of the cyhnd ⁇ c skittle member 17, as may be seen in Fig 1
  • the wing-formed blocking elements 21 which in the shown example have a relatively long axial extension, have an outer radius which is smaller than the inner radius of the tube channel 15 On the other side, the outer radius of each one of the blocking element is larger than the outer radius of the portion engaging in the skittle member
  • the shaft 18 has a plane end surface 24
  • the shape of said end surface may be modified most considerably
  • the surface in question may be made concave, preferably deeply concave
  • the total cross-sectional area of all grooves 22 is at least as large as the cross-sectional area of one of the restricted sections 12, 12' of the channel Most suitably, the total cross-sectional area of the grooves is considerably larger than the above- mentioned restricted section
  • the drill tube 1 is shown with the end piece 2 turned downwards and the end piece 3 turned upwards
  • the drill tube may (when said tube constitutes a part of a composed drill string) be used for upwardly directed drilling (at arbitrary angles between the ground plane and the vertical plane)
  • flushing liquid is then fed in the direction from the bottom part of the drill string towards the drill bit at the upper end of the drill string
  • the valve body 16 will fall down by its own weight to the lower end of the wide channel section and seal against the seat surface 14
  • the valve body will be lifted from the seat and kept floating in the liquid column inside the tube (normally, the valve body is so heavy that it is kept floating in the lower half of the drill tube)
  • the flow of flushing liquid is disrupted in connection with coupling another drill tube at the lower end of the drill
  • the valve body according to the invention also enables downwardly directed drilling with one and the same drill tube Namely, if the drill tube is turned downwards in a drill string (at an arbitrary angle from the ground plane to the vertical plane), the wing-formed blocking elements 21 of the valve body will be stopped either against the welding bead 10' (if the outer radius of the blocking element is larger than the inner radius of the bead) or towards the cone-shaped surface 14' in connection with the channel section 12' (if the outer radius of the blocking element is smaller than the inner radius of the bead) In doing so the flushing liquid may pass freely via the grooves 22 without the valve body sealing against the welding bead or the coned surface In other words, the valve body admits a free flow of flushing liquid to the drill bit in connection with a downwardly directed drilling
  • a substantial advantage of the invention is that one and the same drill tube may be used for arbitrary drilling directions without the operator having to think about the check valve body When a check valve effect is needed, vjz_
  • a valve body 16' has a skittle member with a cone-shaped sealing surface 19' for co-operation with the welding bead 10 instead of the coned surface 14 in connection with the channel section 12
  • a satisfactory sealing effect is achieved, as it is acceptable that a smaller amount of water percolates during the relatively short period of time which is required for connecting another drill tube on a drill string
  • the valve body has a different number of blocking elements than three
  • the blocking elements may be formed as relatively thin, finger-like organs which are mutually separated and extend backwards from the skittle member or a common shaft Neither do the blocking elements need to have the same large axial length as the wings which have been exemplified in the drawings
  • Another feasible embodiment is to make the valve body so that it may be built-in and retained in one of the end pieces of the drill tube, more precisely between the valve seat and a welding bead or another restriction
  • the skittle member sealing against the valve seat may be small (e g ball-like) and furnished with blocking elements in the form of fingers or tines
  • the total length of the valve body must then of course be at least somewhat smaller than the distance between the valve seat and the welding bead so that the valve body may move between closing and opening positions.
  • the valve body may be mounted by being pressed pass the welding bead while elastically deforming the elements, and then said elements are widened again so as to be blocked against the bead.
  • the primary function of the elements is to stop or block the valve body against a restriction in the flushing liquid channel distanced from the valve seat and preferably also steer the valve body so that the sealing surface of the skittle member with reliability is brought into engagement with the valve seat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Check Valves (AREA)
  • Drilling Tools (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Tubes (AREA)

Abstract

Dans un premier aspect, l'invention concerne un tube de forage formant un train de tiges, lequel comprend un canal (15) destiné au passage de liquide d'évacuation, à l'intérieur duquel se trouve un étranglement formant un siège (14) destiné à un corps (16) de soupape servant de clapet de retenue. Ledit tube de forage comprend, outre un élément de quille (17) partiellement sphérique venant au contact du siège (14), au moins deux éléments de blocage (21) séparés tangentiellement. La raison d'être de ces éléments est, lorsque du liquide d'évacuation est acheminé du siège de soupape vers un second étranglement situé à une certaine distance de celui-ci, de stopper le corps de soupape contre ledit second étranglement sans former d'étanchéité contre ce dernier. Par conséquent, on peut utiliser un et même tube de forage pour un forage dirigé aussi bien vers le haut que vers le bas. Dans un second aspect, l'invention concerne le corps de soupape en tant que tel.
PCT/SE1997/001085 1996-06-24 1997-06-18 Tube de forage destine a la formation de trains de tiges WO1997049891A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU32821/97A AU712137B2 (en) 1996-06-24 1997-06-18 Drill tube for forming drill strings
EP97928611A EP0907820B1 (fr) 1996-06-24 1997-06-18 Tube de forage destine a la formation de trains de tiges
CA002258164A CA2258164C (fr) 1996-06-24 1997-06-18 Tube de forage destine a la formation de trains de tiges
AT97928611T ATE257214T1 (de) 1996-06-24 1997-06-18 Bohrrohr für bohrgestänge
DE69727056T DE69727056D1 (de) 1996-06-24 1997-06-18 Bohrrohr für bohrgestänge

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9602472-4 1996-06-24
SE9602472A SE506855C2 (sv) 1996-06-24 1996-06-24 Borrör för bildande av borrsträngar samt ventilkropp för sådant borrör

Publications (1)

Publication Number Publication Date
WO1997049891A1 true WO1997049891A1 (fr) 1997-12-31

Family

ID=20403117

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/001085 WO1997049891A1 (fr) 1996-06-24 1997-06-18 Tube de forage destine a la formation de trains de tiges

Country Status (7)

Country Link
EP (1) EP0907820B1 (fr)
AT (1) ATE257214T1 (fr)
AU (1) AU712137B2 (fr)
DE (1) DE69727056D1 (fr)
SE (1) SE506855C2 (fr)
WO (1) WO1997049891A1 (fr)
ZA (1) ZA975507B (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE922221C (de) * 1952-09-09 1955-01-10 Baker Oil Tools Inc Rohrschuh fuer den Einbau von Rohrstraengen in mit Fluessigkeit gefuellte Tiefbohrloecher
WO1987000572A1 (fr) * 1985-07-19 1987-01-29 Drilex Uk Limited Sous-ensemble a chute de boule pour un appareil de fond
US5174392A (en) * 1991-11-21 1992-12-29 Reinhardt Paul A Mechanically actuated fluid control device for downhole fluid motor
WO1994025723A1 (fr) * 1993-04-27 1994-11-10 Sandvik Ab Element tubulaire de forage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE922221C (de) * 1952-09-09 1955-01-10 Baker Oil Tools Inc Rohrschuh fuer den Einbau von Rohrstraengen in mit Fluessigkeit gefuellte Tiefbohrloecher
WO1987000572A1 (fr) * 1985-07-19 1987-01-29 Drilex Uk Limited Sous-ensemble a chute de boule pour un appareil de fond
US5174392A (en) * 1991-11-21 1992-12-29 Reinhardt Paul A Mechanically actuated fluid control device for downhole fluid motor
WO1994025723A1 (fr) * 1993-04-27 1994-11-10 Sandvik Ab Element tubulaire de forage

Also Published As

Publication number Publication date
AU712137B2 (en) 1999-10-28
SE9602472L (sv) 1997-12-25
ATE257214T1 (de) 2004-01-15
AU3282197A (en) 1998-01-14
DE69727056D1 (de) 2004-02-05
EP0907820A1 (fr) 1999-04-14
EP0907820B1 (fr) 2004-01-02
SE506855C2 (sv) 1998-02-16
SE9602472D0 (sv) 1996-06-24
ZA975507B (en) 1998-01-23

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