US3757873A - Adjustable mast for drilling on hoisting with rigid stay - Google Patents

Adjustable mast for drilling on hoisting with rigid stay Download PDF

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Publication number
US3757873A
US3757873A US00186974A US3757873DA US3757873A US 3757873 A US3757873 A US 3757873A US 00186974 A US00186974 A US 00186974A US 3757873D A US3757873D A US 3757873DA US 3757873 A US3757873 A US 3757873A
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United States
Prior art keywords
drilling
machine assembly
drilling machine
pivot connection
mast
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Expired - Lifetime
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US00186974A
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English (en)
Inventor
K Bice
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MINDRILL Ltd
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MINDRILL Ltd
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Publication date
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    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E21B7/024—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting having means for adapting to inclined terrain; having means for stabilizing the vehicle while drilling
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E21B7/021—With a rotary table, i.e. a fixed rotary drive for a relatively advancing tool

Definitions

  • ABSTRACT A base has rails extending longitudinally in one direction and a drilling machine assembly is supported on the rails for movement in this direction between a forward drilling position and a retracted hoisting position, the drilling machine assembly including a drilling head to grip and rotate an upright drill rod when in the drilling position.
  • Power means are provided to move the drilling machine between its two positions.
  • An upright mast has its lower end pivotally connected to the drilling machine assembly by a first pivot connection to move back and forth with the assembly, and a rigid stay is pivotally connected at its upper end, by a second pivot connection, to an upper part of the mast and is pivotally connected, at its lower end, by a third pivot connection to an anchorage fixed relative to the base, so that the mast is rotated about the second pivot axis upon movement of the drilling machine assembly between the drilling and hoisting positions.
  • a hoist sheave support is suspended from the mast for swinging about the second pivot connection, and hoist sheaves are mounted on the sheave support.
  • the first pivot connection When the drilling machine assembly is in the drilling position, the first pivot connection is spaced forwardly through a preselected distance from a vertical plane through the second pivot connection and, when the drilling machine assembly is in the hoisting position, the first pivot connection is spaced an equal distance rearwardly from this vertical plane, which assures that the second pivot connection and the sheaves remain in the same location for both the drilling and hoisting positions of the drilling machine assembly.
  • the invention has particular but not exclusive application to small drilling rigs and is concerned with rigs of the type incorporating a drilling machine which can be mobed back and forth between a forward drilling position and a rearward hoisting position.
  • the drilling machine assembly usually comprises a drive motor which drives a hoist drum at the rear of the assembly and a drilling head at the front of the assembly.
  • the machine assembly is located in its forward position and the drilling head is then located directly over the hole being drilled.
  • the drilling head grips and rotates the drill string which extends downwardly through it and the drill rod is supported by a hoisting rope passed over one or more sheaves at the top of a mast andthen down to the hoist drum.
  • the whole drilling machine assembly is drawn or racked back to its rearward position and the drill string is hoisted directly by the hoist rope past the retracted drilling head.
  • the hoist rope connected to the drill string must be accurately aligned with it so that the head sheave wheel from which it extends must be very accurately positioned with respect to the hole.
  • this head sheave wheel must be in precisely the same position during both drilling and hoisting operations.
  • at least the top part of the mast must be accurately located in the same position for both operations. In order to achieve this it is usual to provide a large and robust support frame firmly set on the ground.
  • the present invention provides an arrangement whereby the respective head sheave wheel is accurately positioned without the need for a complicated supporting frame.
  • the arrangement according to the present invention can also be such as to avoid fouling of the mast by the top drill rod when the. drilling machine assembly is drawn backto its hoisting position.
  • drilling apparatus comprising a base, a drilling machine assembly mounted on the base and including a drilling head, an upright mast pivotally connected at its lower end to the machine assembly by a first pivot connection, an arm pivotally connected at one end by a second pivot connection to an upper part of the mast and pivotally connected at its other end by a third pivot connection to a fixed anchorage, and hoist sheave means supported from said part of the mast, and wherein the drilling machine assembly is movable transversely of the mast from a drilling position in which the first pivot connection is in a first position and the second pivot connection is in a second position to a hoisting position in which the first pivot connection is in a third position spaced from the first position and spaced from the second position by a distance equal to the distance between the first and second positions so that the second pivotconnection is disposed in said second position.
  • the sheave means is in the same position for the drilling and hoisting positions of the drilling machine assembly.
  • said first and third positions are spaced one to
  • FIG. 1 is a side elevation of a drilling apparatus shown in condition for drilling operations
  • the illustrated apparatus comprises a drilling machine assembly denoted generally as ll and mounted on a fixed base 12 in a manner to be described below.
  • the machine assembly 11 is of conventional construction comprising a drive motor 13 which drives a hoist 14 and a drilling head 16.
  • An upright mast 17 is pivotally connected at its lower end to the machine assembly 1 1 by a pivot connection 18.
  • mast 17 is of light-weight box girder construction comprising longitudinal stringers 19 and lattice bracing members 21, but its lower end is formed by a bracket 22 connected to the machine assembly 11 by a pivot pin forming the pivot connection 18 about an axis 24.
  • the upper part of mast 17 is pivotally connected at 26 to the upper end of a stay arm 27 which is inclined at an acute angle to the mast and is pivotally connected at its bottom end to an anchor 29 by a pivot connection 28.
  • Anchor 29 is carried byamount 31 which is fixed relative to the machine base 12 either by being connected directly to it or by being set firmly in the ground.
  • Arm 27 comprises a central girder section 32, a bottom adjustment portion 33.and an upper portion 34.
  • the lower adjustment portion 33 comprises a screw threaded stem 36 clamped to the bottom of the arm portion 32 by lock nuts 37 and screw-fitted into an internal thread socket member 38 which is connected to the anchor 29 by a ball joint forming the pivot connection 28.
  • the upper part 34 of arm 27 is bifurcated so as to have two end portions 41 extending one to either side of the upper part of the mast and pivotally connected at their upper ends to the mast by a composite pivot pin 42.
  • the composite pivot pin comprises a central tube 43 to which the upper ends of the arm parts 41 are clamped by studs 44.
  • 'Pivot tube 43 extends through a bearing tube 46 which is fixed between side plates 47 on the upper part of the mast.
  • a cradle 49 carrying a pair of head sheaves 50, 51 hangs from the pivot bearing tube 46 at the upper end of the mast.
  • the cradle 49 comprises a frame 52 in which the sheaves 50, 51 are journalled and a pair of yoke members 53.
  • the yoke members are of generally inverted U-shape and extend over the pivot bearing tube 46 so that the whole cradle 49 hangs freely from the pivot bearing tube and is free to swing under gravity about the axis 48 of the tube.
  • a cable 55 extends from the hoist 14 to the sheave 50. It passes around sheaves S and 51 and then downwardly to a connection to the top drill rod whence it supports the drill string.
  • FIG. 1 shows the apparatus in a condition ready for drilling.
  • the main part of the mast is vertical and the sheave 51 is positioned directly above the hole being drilled so that the drill string is supported by cable 55 in accurate alignment with the hole.
  • the whole of the machine assembly 11 is drawn back along base 12 and away from the hole to the position shown in FIG. 2.
  • the drilling head 16 is thus drawn back from its position over the hole and the drill rods can be hoisted directly past it.
  • the sheave 51 should be accurately positioned directly over the hole not only during drilling operations but also during hoisting. It is therefore most desirable that the position of the sheave 51 be in precisely the same position when the drilling machine is drawn back for hoisting operations as when it is in its forward position for drilling.
  • the geometry of the illustrated arrangement is carefully arranged to produce this result.
  • the forward and rear positions of the pivot connection 18 both lie on the same circular arc centered on the position of axis 48. In other words, even after pivot connection 18 has moved from its forward position to its rear position, it is spaced by the same distance from the original position of axis 48. Therefore the effect of the linking of the mast to stay arm 27 is that the pivot connection 26 at the top of the mast will he in precisely the same place for the two po sitions of the drilling machine assembly although it may in fact move while the machine assembly is being moved between these forward and back positions.
  • the drilling machine assembly could be drawn back away from the hole in a straight horizontal path. In this case the pivot position 26 would in fact move upwardly through the first half of the movement of the assembly and would then return back to its original position. Because the position of the pivot bearing tube 16 is precisely the same for the forward and back positions of the drilling machine the sheave carriage 49 also hangs in precisely the same position although the mast has moved relative to it.
  • the drilling machine assembly 11 is in fact not drawn back in a straight horizontal path.
  • the assembly 11 is mounted on the base 12 via front support collars 61 and rear support collars 62 which slide on front tubular rails 63 and rear tubular rails 64 fitted to the base.
  • the rear rails 64 are inclined upwardly and rearwardly so that the whole of the drilling machine assembly 11 is canted when it is drawn back to its rear position.
  • the arrangement is such that the pivot connection 18 adopts position 57 when the assembly 11 is drawn back to its fullest extent, i.e., the same position which it would adopt if the assembly were drawn back in a straight line.
  • the canting of the assembly 11 is provided in order to avoid the top of the drill string from fouling the mast during racking back. It is usual to leave the top drill rod engaged with the drilling head during racking back to avoid the necessity to break the water supply and control connections made to it.
  • the top drill rod 60 is unscrewed from the remainder of the drill string and is then drawn back with the drilling head and out of the way before the remainder of the drill string 65 is hoisted as shown in FIG. 2. Ifthe drilling machine assembly 11 were drawn back in a straight path the top of its top rod would foul the top of the mast. However, in the illustrated arrangement the tilting of the drilling machine assembly 11, and therefore the drilling head 16, is sufficient to cant the top drill rod so that it clears the mast.
  • the drilling head tilts through a rather smaller angle than does the mast as the drilling machine assembly is racked back.
  • the top drill rod 60 is generally parallel with the front face of the mast but when assembly 1 1 has been racked back it is inclined to the front face of the mast. This is necessary to allow the remainder of the drill string 65 to be hoisted without fouling the top of drill rod 60.
  • the tilting movement of the drilling head 16 in fact corresponds to swinging movement about a pivot located about twice as far away as the top of the mast.
  • the machine assembly 11 is driven backwardly and forwardly along the rails 63,64 by operation of a double acting hydraulic ram 66 pivotally connected between the assembly and the base 12.
  • support collars 61, 62 are not cylindrical but their internal surfaces are conically tapered at their ends 61A, 61B, 62A, 62B and that the rails are mounted between members which define similarly tapered plugs 68A, 68B, 69A, 69B.
  • the tapered ends 61A, 62A engage the tapered plugs 68A, 69A whereby the machine assembly is positively located and firmly locked in position merely by maintaining hydraulic pressure of the ram 66.
  • the assembly is positively located and firmly locked in its rearward position by the engagement of the tapered surfaces 61B, 623 with the plugs 68B, 693. There is therefore no need to fasten and unfasten clamping means before and after each racking operation as in conventional apparatus.
  • Drilling apparatus comprising in combination, a base; rail means mounted on said base to extend longitudinally in one general direction; a drilling machine assembly supported on said rail means for movement back and forth in said general direction; stop means limiting movement of said drilling machine assembly along said rail means between a forward drilling position and a retracted hoisting position; said drilling machine assembly including a drilling head to grip and rotate an upright drill rod when in thedrilling position; power means operaable to move said drilling machine assembly between its drilling and hoisting positions; an upright mast having its lower end pivotally connected to said drilling machine assembly at a first pivot connection, to move back and forth with said drilling machine assembly; a rigid stay having one end pivotally connected, by a second pivot connection, to an upper part of said mast, and having its other end pivotally connected, by a third pivot connection, to an anchorage fixed relative to said base, whereby said mast is rotated about said second pivot connection responsive to movement of said drilling machine assembly between its drilling and hoisting positions; a hoist sheave support suspended from the upper part of said mast
  • said first pivot connection is in a first position and said second pivot connection is in a second position and, when said drilling machine assembly is in its hoisting positio, said first pivot connection is in a third position spaced from said second position by a distance equal to the spacing between said first and second positions, whereby said mast and said stay serve as a linkage assuring said second pivot connection remaining in said second position so that the location of said sheave means is identical in both the back and forth in said general direction; stop means limiting movement of said drilling machine assembly along said rail means between a forward drilling position and a retracted hoisting position; said drilling machine assembly including a drilling head to grip and rotate an upright drill rod when in the drilling position; power means operable to move said drilling machine assembly between its drilling and hoisting positions; an upright mast having its lower end pivotally connected to said drilling machine assembly at a first pivot connection, to move back and forth with said drilling machine assembly; a rigid stay having one end pivotally connected, by a second pivot-connection, to an
  • Drilling apparatus as claimed in claim 2, in which said drilling machine assembly includes a winch drum and said sheave means comprises a pair of sheave wheels mounted for rotation on said sheave support; one of said sheave wheels being located directly above said winch drum when said drilling machine assembly is in its hoisting position; the other of said sheave wheels being located directly above the drill hole during both the drilling and hoisting operations.
  • Drilling apparatus as claimed in claim 2, in which said drilling machine assembly in moving from the drilling position to the hoisting position rotates about a horizontal transverse axis to tilt said drilling head in the same direction as the direction of tilt of said mast away from its original upright position resulting from said movement of said drilling machine assembly.
  • Drilling apparatus as claimed in claim 4, in which the angle through which said drilling head'is tilted is less than the angle through which said mast is tilted.
US00186974A 1970-10-06 1971-10-06 Adjustable mast for drilling on hoisting with rigid stay Expired - Lifetime US3757873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU276670 1970-10-06

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JP (2) JPS5130522B1 (ja)
CA (3) CA945539A (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102061882A (zh) * 2010-11-29 2011-05-18 连云港黄海机械股份有限公司 一种多功能自走式塔机一体岩芯钻机
CN104278946A (zh) * 2014-10-19 2015-01-14 唐浪钦 插接组装式水井钻机
CN106337658A (zh) * 2016-08-25 2017-01-18 四川诺克钻探机械有限公司 一种千米级岩心钻机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE538633C2 (sv) * 2013-03-01 2016-10-04 Atlas Copco Rock Drills Ab Borrarrangemang och förfarande vid borrarrangemanget
CN105386723A (zh) * 2015-12-18 2016-03-09 黄朝阳 长螺旋桅杆可旋转式钻机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3254242A (en) * 1963-05-23 1966-05-31 Bell Telephone Labor Inc Delay timing circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3254242A (en) * 1963-05-23 1966-05-31 Bell Telephone Labor Inc Delay timing circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102061882A (zh) * 2010-11-29 2011-05-18 连云港黄海机械股份有限公司 一种多功能自走式塔机一体岩芯钻机
CN102061882B (zh) * 2010-11-29 2013-09-25 连云港黄海机械股份有限公司 一种多功能自走式塔机一体岩芯钻机
CN104278946A (zh) * 2014-10-19 2015-01-14 唐浪钦 插接组装式水井钻机
CN106337658A (zh) * 2016-08-25 2017-01-18 四川诺克钻探机械有限公司 一种千米级岩心钻机
CN106337658B (zh) * 2016-08-25 2018-06-29 四川诺克钻探机械有限公司 一种千米级岩心钻机

Also Published As

Publication number Publication date
JPS5130522B1 (ja) 1976-09-01
JPS5210801B1 (ja) 1977-03-26
CA946822A (en) 1974-05-07
CA953706A (en) 1974-08-27
CA945539A (en) 1974-04-16

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