CA1157007A - Well drilling apparatus - Google Patents
Well drilling apparatusInfo
- Publication number
- CA1157007A CA1157007A CA000377872A CA377872A CA1157007A CA 1157007 A CA1157007 A CA 1157007A CA 000377872 A CA000377872 A CA 000377872A CA 377872 A CA377872 A CA 377872A CA 1157007 A CA1157007 A CA 1157007A
- Authority
- CA
- Canada
- Prior art keywords
- drilling
- axis
- drilling unit
- unit
- movement
- 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
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 265
- 230000033001 locomotion Effects 0.000 claims abstract description 95
- 229910052729 chemical element Inorganic materials 0.000 claims 6
- 229920000136 polysorbate Polymers 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 4
- 210000005069 ears Anatomy 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000009987 spinning Methods 0.000 description 2
- 244000261422 Lysimachia clethroides Species 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/14—Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole
-
- 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
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
- E21B3/022—Top drives
-
- 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
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
WELL DRILLING APPARATUS
Abstract of the Disclosure A well drilling system designed to eliminate the usual rotary table, kelly and kelly bushing, and including a drilling unit having a tubular part connectible to the upper end of the drill string and a motor for driving that tubular part rotatively, with the drilling unit being mounted by a guide structure for vertical movement, and in addition being mounted for movement transversely of the axis of the well from the normal drilling position to at least one laterally offset position. Preferably, the drilling unit is movable to two different laterally offset positions, in one of which the drilling unit is above a mousehole location to pick up or release a pipe section, and in the other of which the drilling unit is at an inactive location at which it may remain during a trip of the drill string into or out of the well.
Abstract of the Disclosure A well drilling system designed to eliminate the usual rotary table, kelly and kelly bushing, and including a drilling unit having a tubular part connectible to the upper end of the drill string and a motor for driving that tubular part rotatively, with the drilling unit being mounted by a guide structure for vertical movement, and in addition being mounted for movement transversely of the axis of the well from the normal drilling position to at least one laterally offset position. Preferably, the drilling unit is movable to two different laterally offset positions, in one of which the drilling unit is above a mousehole location to pick up or release a pipe section, and in the other of which the drilling unit is at an inactive location at which it may remain during a trip of the drill string into or out of the well.
Description
, "'` ~ ' "
1 Background of the Invention
1 Background of the Invention
2 This invention relates to improved well drilling apparatus
3 of a type adapted to eliminate the necessity for a rotary
4 table, kelly or kelly bushing.
Conventional rotary drilling as practiced for many years 6 has required the use of a rotary table containing an opening 7 through which a noncircular kelly pipe extends for engagement 8 with a kelly bushing mounted in the table, in a relation 9 driving the kelly bushing and connected drill string rotatively while permitting downward advancement of the kelly relative 11 to the table. Alternative-drilling systems have been proposed 12 in which the drive to the pipe string has been derived from 13 a drilling unit including a section of pipe connectable to ~ ;
14 the upper end of the drill string, and a motor for driving that pipe rotatively to turn the string. This entire powered 16 driliing assembly may then move upwardly and downwardly with 17 the string to drive the string very directly and positively 18 and without the necessity for a kelly and kelly bushing type 19 connection.
221 ,'' . ':
~ 2245 .
2 ~
-; ~ , . :
" ~ r~l 1 Summary of the Invention 2 Drilling apparatus embodying the present invention 3 utilizes a direct drive arrangement of this general type, 4 but ~hich is specially designed to facilitate the connection o aclditional pipe sections into the pipe string, and the 6 removal of sections from the string. The powered drive unit 7 of the apparatus can itself function as a portion of the 8 pipe handling equipment, moving pipe sections between a 9 mousehole location and the axis of the well during drilling, and can be removed to a retracted inactive position during a 11 trip of the string into or out of the well.
12 The powered drilling unit, including a preferably tubular 13 rotary element connectable to the drill string and a drive 14 motor, and also desirably including a swivel connected to the up~er end of the rotary element to supply drilling fluid 16 thereto, is guided for movement along the axis of the well by 17 a guide structure extending parallel to that axis. In addition 18 to this movement longitudinally of the well, the drilling unit 19 is also mounted for movement generally transversely of the well axis, between a drilling position of alignment with the 21 drill string and at least one and preferably two laterally 22 offset positions. In one of those positions, the drilling unit 23 is positioned over a mousehole location, to pick up a stand of 24 pipe, which may typically be either a single, double or triple joint stand, and then lift that pipe from the mousehole and move 26 it laterally back to alignment with the drill string for 27 connection thereto. The second of the laterally offset position~
28 may be at a different side of the well, at the usual rat hole 29 location, at which the drilling unit may be retained in an inactive position during a trip of the string into or out of 31 the well.
3811 The drilling unit m~y be mounted for it~ movement .
~ 3 7 1 longitudinally of the guide structure by a carriage structure, 2 desirably including two carriage units moving along two vertical 3 guide tracks. The shifting movement of the drilling unit 4 transversely of the well axis may be attained by mounting the drilling unit for transverse or horizontal movement relative 6 to the mentioned carriage structure, with this movement being 7 effected by appropriate motor means, and with the drilling 8 unit being releasably retainable in its drilling position by 9 latch means. .
The movement of the drilling unit to the other laterally 11 offset position, desirably at the usual rat hole location, 12 may be attained by mounting a lower portion of the guide 13 structure itself for lateral preferably swinging movement 14 relative to the upper portion of the guide structure and with Z~ t carrled drilling unit.
~;
1 Brief DescriPtion of the Drawings 2 The above and other features and objects of the invention 3 will be better understood from the following detailed 4 description of the typîcal embodiment illustrated in the accompanying drawings, in which:
6 Fig. 1 is a vertical section through a drill rig 7 embodying the invention and taken on line 1-1 of Fig. 2;
8 Fig. 2 is a vertical section taken on line 2-2 of Fig. l;
9 Fig. 3 is an enlarged view corresponding to a lower portion of Fig. 1, but with the drilling unit in its lowered 11 position;
12 Fig. 4 is a view taken on line 4-4 of Fig. 3;
13 Figs. 5 and 6 are horizontal sections taken on lines 14 5-5 and 6-6 respectively of Fig. l;
Fig. 7 is a section taken e~sentially on line 7-7 of 16 Fig. 3;
17 Fig. 8 is a fragmentary vertical section taken on line 8-8 18 of Fig. 7;
19 Fig. 9 is a vertical section taken partially on line 9-9 of Fig. 7;
21 Figs. 10, 11 and 12 are diagrammatic side view represen-22 tations of the condition of the apparatus at different stages 23 during the drilling operation; and 24 Figs. 13 and 14 are fragmentary diagrammatic front view il strations of the apparatus in two addltional conditions.
1 Description of the Preferred Embodiment 2 With reference first to Figs. 1 and 2, there is illustrated 3 somewhat diagrammatically at 10 a conventional well drilling 4 mast to which apparatus embodying the invention has been mounted. The drilling equipment includes a vertical guide 6 structure 11 and a powered drilling unit or sub 12 mounted by 7 the guide structure for movement along the vertical axis 13 8 of the well 14 and the tubular sectionally formed drill string 15 9 therein. ~he drilling unit is also mounted for movement from its Figs. l and 2 normal position of alignrnent with the drill 11 string to a forwardly offset position represented in Fig. 11 12 and a laterally offset position represented in Fig. 13.
13 The guide structure 11 includes two upper guide rails 16 14 which extend parallel to one another and to vertical axis 13 and may have the cross-section illustrated in Fig. 5, and 16 which are rigidly secured at spaced locations to horizontal 17 members 17 of the mast. Beneath rails 16, the guide structure 18 include~ two shorter lower rails 18 of the same cross-section 19 as upper rails 16 and aligned vertically therewith in the normal drilling position of Figs. 1 and 2 to form lower 21 continuations of rails 16 typically meeting the latter at 22 inclined edges 19 (Fig. 4).
23 The lower rails 18 are not rigidly secured to the mast, 24 but rather are connected together as an inte~ral structure, as by welding them to horizontal elements 20 and diagonal 26 braces 21, with this entire framework being rigidly connected 27 to a vertical member 22 having upper and lower aligned 28 vertical pins 23 and 24 receiva~le within openings in bearing 29 elements 25 and 26 mounted stationarily to the mast, in a relation mounting the two lower rail elements 18 and their 31 connected parts for swinging movement about a vertical axis 27 32 between the active full line position of Fig. 6 and the , ~ A . ~;; q ~ r ,1 1 inactive broken line position of that figure.
2 The drilling unit is mounted for its vertical mo~ement 3 by two similar carriage assemblies 28 and 29, each of which 4 includes two spaced parallel vertical side plates 30 having
Conventional rotary drilling as practiced for many years 6 has required the use of a rotary table containing an opening 7 through which a noncircular kelly pipe extends for engagement 8 with a kelly bushing mounted in the table, in a relation 9 driving the kelly bushing and connected drill string rotatively while permitting downward advancement of the kelly relative 11 to the table. Alternative-drilling systems have been proposed 12 in which the drive to the pipe string has been derived from 13 a drilling unit including a section of pipe connectable to ~ ;
14 the upper end of the drill string, and a motor for driving that pipe rotatively to turn the string. This entire powered 16 driliing assembly may then move upwardly and downwardly with 17 the string to drive the string very directly and positively 18 and without the necessity for a kelly and kelly bushing type 19 connection.
221 ,'' . ':
~ 2245 .
2 ~
-; ~ , . :
" ~ r~l 1 Summary of the Invention 2 Drilling apparatus embodying the present invention 3 utilizes a direct drive arrangement of this general type, 4 but ~hich is specially designed to facilitate the connection o aclditional pipe sections into the pipe string, and the 6 removal of sections from the string. The powered drive unit 7 of the apparatus can itself function as a portion of the 8 pipe handling equipment, moving pipe sections between a 9 mousehole location and the axis of the well during drilling, and can be removed to a retracted inactive position during a 11 trip of the string into or out of the well.
12 The powered drilling unit, including a preferably tubular 13 rotary element connectable to the drill string and a drive 14 motor, and also desirably including a swivel connected to the up~er end of the rotary element to supply drilling fluid 16 thereto, is guided for movement along the axis of the well by 17 a guide structure extending parallel to that axis. In addition 18 to this movement longitudinally of the well, the drilling unit 19 is also mounted for movement generally transversely of the well axis, between a drilling position of alignment with the 21 drill string and at least one and preferably two laterally 22 offset positions. In one of those positions, the drilling unit 23 is positioned over a mousehole location, to pick up a stand of 24 pipe, which may typically be either a single, double or triple joint stand, and then lift that pipe from the mousehole and move 26 it laterally back to alignment with the drill string for 27 connection thereto. The second of the laterally offset position~
28 may be at a different side of the well, at the usual rat hole 29 location, at which the drilling unit may be retained in an inactive position during a trip of the string into or out of 31 the well.
3811 The drilling unit m~y be mounted for it~ movement .
~ 3 7 1 longitudinally of the guide structure by a carriage structure, 2 desirably including two carriage units moving along two vertical 3 guide tracks. The shifting movement of the drilling unit 4 transversely of the well axis may be attained by mounting the drilling unit for transverse or horizontal movement relative 6 to the mentioned carriage structure, with this movement being 7 effected by appropriate motor means, and with the drilling 8 unit being releasably retainable in its drilling position by 9 latch means. .
The movement of the drilling unit to the other laterally 11 offset position, desirably at the usual rat hole location, 12 may be attained by mounting a lower portion of the guide 13 structure itself for lateral preferably swinging movement 14 relative to the upper portion of the guide structure and with Z~ t carrled drilling unit.
~;
1 Brief DescriPtion of the Drawings 2 The above and other features and objects of the invention 3 will be better understood from the following detailed 4 description of the typîcal embodiment illustrated in the accompanying drawings, in which:
6 Fig. 1 is a vertical section through a drill rig 7 embodying the invention and taken on line 1-1 of Fig. 2;
8 Fig. 2 is a vertical section taken on line 2-2 of Fig. l;
9 Fig. 3 is an enlarged view corresponding to a lower portion of Fig. 1, but with the drilling unit in its lowered 11 position;
12 Fig. 4 is a view taken on line 4-4 of Fig. 3;
13 Figs. 5 and 6 are horizontal sections taken on lines 14 5-5 and 6-6 respectively of Fig. l;
Fig. 7 is a section taken e~sentially on line 7-7 of 16 Fig. 3;
17 Fig. 8 is a fragmentary vertical section taken on line 8-8 18 of Fig. 7;
19 Fig. 9 is a vertical section taken partially on line 9-9 of Fig. 7;
21 Figs. 10, 11 and 12 are diagrammatic side view represen-22 tations of the condition of the apparatus at different stages 23 during the drilling operation; and 24 Figs. 13 and 14 are fragmentary diagrammatic front view il strations of the apparatus in two addltional conditions.
1 Description of the Preferred Embodiment 2 With reference first to Figs. 1 and 2, there is illustrated 3 somewhat diagrammatically at 10 a conventional well drilling 4 mast to which apparatus embodying the invention has been mounted. The drilling equipment includes a vertical guide 6 structure 11 and a powered drilling unit or sub 12 mounted by 7 the guide structure for movement along the vertical axis 13 8 of the well 14 and the tubular sectionally formed drill string 15 9 therein. ~he drilling unit is also mounted for movement from its Figs. l and 2 normal position of alignrnent with the drill 11 string to a forwardly offset position represented in Fig. 11 12 and a laterally offset position represented in Fig. 13.
13 The guide structure 11 includes two upper guide rails 16 14 which extend parallel to one another and to vertical axis 13 and may have the cross-section illustrated in Fig. 5, and 16 which are rigidly secured at spaced locations to horizontal 17 members 17 of the mast. Beneath rails 16, the guide structure 18 include~ two shorter lower rails 18 of the same cross-section 19 as upper rails 16 and aligned vertically therewith in the normal drilling position of Figs. 1 and 2 to form lower 21 continuations of rails 16 typically meeting the latter at 22 inclined edges 19 (Fig. 4).
23 The lower rails 18 are not rigidly secured to the mast, 24 but rather are connected together as an inte~ral structure, as by welding them to horizontal elements 20 and diagonal 26 braces 21, with this entire framework being rigidly connected 27 to a vertical member 22 having upper and lower aligned 28 vertical pins 23 and 24 receiva~le within openings in bearing 29 elements 25 and 26 mounted stationarily to the mast, in a relation mounting the two lower rail elements 18 and their 31 connected parts for swinging movement about a vertical axis 27 32 between the active full line position of Fig. 6 and the , ~ A . ~;; q ~ r ,1 1 inactive broken line position of that figure.
2 The drilling unit is mounted for its vertical mo~ement 3 by two similar carriage assemblies 28 and 29, each of which 4 includes two spaced parallel vertical side plates 30 having
5 the outline configuration illustrated in Fig. 4 and received
6 at opposite sides of the corresponding rail 16 or 18. These
7 two plates 30 of each carriage 28 or 29 are rigidl~ secured
8 together in any appropriate manner, and carry rollers coacting
9 with tracks 16 and 18 to guide the carriages for only vertical movement relative thereto. More particularly, as seen in 11 Figs. 4, 5 and 6, each of the carriages includes two pairs 12 o~ rollers 31 and 32 mounted to the side plates 30 and engaging 13 the back sides of the front flanges of the I-shaped beams or 14 tracks 16 and 18, with the rollers also including two additional pairs of rollers 33 and 34 between plates 30 engaging the 16 fronts of the same flanges. All of the rollers 31, 32, 33 17 and 34 are mounted to the carriage plates 30 for rotation 18 about parallel horizontal axes enabling the rollers to roll 19 upwardly and downwardly along the tracks with the flanges confined therebetween in effective guiding relation. At 21 opposite sides of the main web 34 of tracks 16 and 18, the 22 carriage plates 30 rotatably mount additional pairs of rollers 23 35 and 36 confining the web 34 therebetween and thus retaining 24 the carriages against lateral movement as they roll upwardly and downwardly.
26 The outer edges of plates 30 of each carriage 28 or 29 27 arP secured together by plates 37 (Fig. 3), to which angular 28 brace members 38 are rigidly secured. The outer ends o~
29 brace members 38 of the two carriage structures are connected to the outer extremities of two elongated horizontal guide 31 members 39 and 40, whose longitudinal axes 41 and 141 are 32 parallel to one another (Fig. 7). The inner extremities of 1 the two n,embers 39 and 40 are appropriately rigidly welded , 2 or otherwise secured to plates 30 of their respective 3 carriages, to be integral therewith. The vertical transverse 4 crossffectional configuration of guide member 39 may be as represented in Fig. 8, typically being of essentially 6 rectangular vertical section and having a series of rack teeth 7 42 extending along the inner side of member 39. The second 8 member 40 may be of similar vertical section, but have its 9 rack teeth 43 formed at the left side of member 40 rather than at the right side as in the case of member 39.
11 The drilling unit 12 includes a vertical pipe section 12 or sub 44 having a lower externally threaded pin portion 45 13 connectable into the upper end of drill string 15, and having 14 an upper internally threaded box end 46 into which the externally threaded rotatable~ stem 47 of a conventional 16 swivel 48 is connectable. Pipe section 44 contains a vertical 17 passage 49 through which circulating fluid flows downwardly 1 from the stem 47 of the swivel to the drill string for discharge 19 at the location of the bit, and for flow upwardly about the outside of the string during a drilling operation. The 21 non-rotating swivel body 50 has a bail 51 connectable to 22 the suspending hook 52 of a traveling block 53, which is 2 adapted to be raised and lowered in conventional fashion by 24 lines 54 extending about pulley wheels of the traveling block 53 and the upper crown block 55.
26 The rotary pipe section 44 is mounted rotatably to a 27 body 56 of the drilling unit, which body may be formed 28 sectionally as illustrated in Fig. 9 of top and bottom walls 29 57 and 58 and peripheral walls 59 all appropriately bolted or otherwise secured together to define an interior chamber 60 31 within which gears 61 and 62 are mounted. Two oppositely 3~ disposed roller thrust bearings 63 and 64 mount the part 44 .,,~ t~
1 for its desired rotation relative to bodies 56 about vertical 2 axis 13, and gear 61 is rigidly secured to part 44, and 3 keyed rotatively thereto, for rotation wi~h part 44. The 4 second and smaller gear 62 is connected to the drive shaft of a preferably electric motor 65, which is secured to the 6 underside of bottom wall 58 of body 56 with its axis 66 7 extending parallel to vertical axis 13. A brake 67 may be 8 carried at the underside of the motor for applying braking 9 fo-rce to prevent rotation of the motor and the part 44 when desired. This brake may include an externally cylindrical 11 drum 68 ~igidly secured to lower end 69 of ~he motor shaft, 12 with a non-rotating cylindrical housing 70 being disposed 13 about the drum and an annular inflatable bladder 71 being 14 confined within housing 70 and actuating cylindrically curving brake shoes 72 inwardly against drum 68 when the 16 bladder is inflated~
17 The drilling unit is mounted for horizontal sliding 18 movement relative to carriages 28 and 29 along a horizontal 19 axis 73 which is parallel to axes 41 and 141 (Fig. 7). To mount the drilling unit for this purpose, the body 56 of 21 that unit is provided with two oppositely laterally projecting 22 ears 74 and 75, containing guideway passages 76 and 77 within 23 which the two parallel guides 39 and 40 are slidably received.
24 The guideway 76 has a cross-section at locations 176 and 276 to closely slidably receive member 39, with the teeth of a 26 pinion wheel 78 driven by a motor 79 secured to body 56 27 being in engagement with the rack teeth 42 to power actuate 28 body 56 and the carried parts between the full line and broken 29 line positions of Fig. 6. The guideway 77 similarly closely slidably receives member 40, with a pinion 80 driven by a 31 second motor 81 engaging the rack teeth 43 to assist in 3~ powered actuation o the drilling unit between its two Fig. 6 1 positions. These two motors 79 and 81 may be energized in 2 contxolled unison, to drive their pinions simultaneously and 3 at corresponding rates, to thereby apply equal actuating ;
4 forces at opposite sides of the drilling unit. The two motor~
79 and 81 are reversible to power actuate the drilling unit 6 in either direction.
7 The body 56 of the drilling unit is xeleasably retainable 8 in the full line position of Fig. 6, in which rotary pipe 9 section 44 is aligned with and adapted to drive the drill string, with this retention being effected by a pair of latch 11 elements 84 mounted ~y pins 85 attached to ears 74 12 and 75 for swinging movement about parallel vertical axes 13 between the active full line positions of Fig. 7 and the 14 inactive broken line positions of that figure. Springs 86 yieldingly urge the latches to their active full line positions, 16 in which the latches engage vertical pins 87 rigidly secured 17 to the bodies of the carriages 28 and 29. When the drilling 18 unit is moved toward its full line position of Fig. 6, pins 87 19 engage camming surfaces 88 on the latches in a manner deflecting them toward their broken line positions to pass the pins, 21 following which the springs 86 return the latches to their 22 full line positions to then positively retain the drilling 23 unit in its inner position adjacent the carriages. The latch 24 elements may be releasable either manually or by powered means.
To describe the use of the illustrated equipment, assume 26 that the apparatus is initially in the condition of Fig. 1, 27 with the rotary pipe,section 44 of the drilling unit connected 28 threadedly to the upper end of drill string 15, and with the 29 lower track elements 18 in their position of alignment with upper track section9 16. Drilling fluid is supplied to swivel 31 48 through a flexible hose 89 connected to gooseneck 90, and 3~ flows downwardly through section 44 and the drill string to ~ t~
1 the bit. As motor 65 drives member 44 rotatively thro~gh gears 61 and 62, the rotation of element 44 drives the drill string and bit to drill the hole progressively more deeply 4 into the earth. As the drilling unit moves downwardly from 5 the E'ig. 1 position, the carriages 28 and 29 ultimately reach 6 the location of the lower guide rails or tracks 18, and move 7 onto those tracks and are directed downwardly thereby to the 8 Fig. 3 position at which it becomes desirable to connect 9 another stand of drill pipe into the string. With the apparatus in the Fig. 3 condition, the threaded joint between rotary 11 drive section 44 of the drilling unit and the upper section 12 of the drill string is broken, and completely s~un out by 13 left-hand rotation of section 44. The initial 30in~ breaking 14 rotation and the s~inning action may both be attained by an auxiliary joint making and breaking unit, or alternatively 16 the spinning action may be accomplished by utilizing a 17 reversible motor at 65 and reversing its direction of rotation 18 for unscrewing part 44 from the string.
19 After the drilling unit has thus been disconnected from ~ the upper end of the string, as represented in full lines 21 in Fig. 10, the drilling unit is actuated from that position 22 above the upper end of the drill string to the broken line 23 position of Figs. 6 and 10, by releasing latch elements 84 24 an2 energizing motors 79 and 81, so that the pinions driven by those motors act against racks 42 and 43 to shift the 26 drilling unit outwardly. This motion is limited by engagement 2~ of shoulders 89 on ears 74 and 75 with elementsl90 attached 28 to the ends of inclined brace elements 38 and members 39 and 29 40 of the carriages. In that outermost position represented in broken lines in Figs. 6 and 10, the rotary drive pipe 44 31 of the drilling unit is located directly above and in axial 3~ alignment with a stand of pipe 91 located within a mousehole 92 ' 1~
1 (Fiq. 4) formed in front of the pipe string. The axis 93 of 2 this mousehole may extend directly vertically and parallel to 3 the axis 13 of the well and drill pipe, and may be of a 4 depth to contain any desired number of pipe sections connected threadedly together in end to end relation. The present 6 apparatus is not limited to addition of pipe sections as only 7 single joints, but rather may add stands consisting of one, 8 two or three joints.
9 With the drilling unit in its broken line position of Figs. 4, 6 and 10, motor 65 is energized to screw the tubular 11 element 44 of the drilling unit into connection with the 12 upper end-of the-stand of pipe in the mousehole. After such 13 connection, and with the drilling unit still in its outward 14 position of alignment with the mousehole axis 93, the drilling unit is pulled upwardly along guide tracks 18 and onto and 16 along the upper longer guide tracks 16, until the entire length 17 of pipe within the mousehole is moved upwardly out of the 18 mousehole and to a level above the upper end of the drill string 19 This position is illustrated in full lines in Fig. 11. The two motors 79 and 81 are then energized in reverse direction, 21 to move the drilling unit inwardly relative to the carriage 22 structure and to the:broken line position of Fig. 11, so 23 that the pipe sections from the mousehole are now directly 24 above and in alignment with the upper end of the drill string.
The traveling block is then lowered slightly to move the 26 lower pin end of the pipe sections from the mousehole into 27 the upper end of the drill string, following which the threaded 28 connection may be completed by spinning the added pipe section 29 and then torquing it as necessary. After that connection is made, rotation of motor 65 can drive element 44 and the drill 31 string and car~ied bit, while drilling fluid iB forced 32 __ I ` 12 1 ¦ downwardly therethrough, to proceed with the drilling operation, 2 ¦ and with progressive lowering of the drilling unit as in the 3 ¦ first described drilling operation until the Fig. 3 position ¦ is again attained. During downward advancement of the 5 ¦ drilling unit, additional pipe of the desired length can be 6 ¦ placed in the mousehole for connection into the string on 7 the next lengthening operation.
8 ¦ When a round trip of the drill string becomes necessary, 9 ¦ the drilling unit of the present invention may be moved to
26 The outer edges of plates 30 of each carriage 28 or 29 27 arP secured together by plates 37 (Fig. 3), to which angular 28 brace members 38 are rigidly secured. The outer ends o~
29 brace members 38 of the two carriage structures are connected to the outer extremities of two elongated horizontal guide 31 members 39 and 40, whose longitudinal axes 41 and 141 are 32 parallel to one another (Fig. 7). The inner extremities of 1 the two n,embers 39 and 40 are appropriately rigidly welded , 2 or otherwise secured to plates 30 of their respective 3 carriages, to be integral therewith. The vertical transverse 4 crossffectional configuration of guide member 39 may be as represented in Fig. 8, typically being of essentially 6 rectangular vertical section and having a series of rack teeth 7 42 extending along the inner side of member 39. The second 8 member 40 may be of similar vertical section, but have its 9 rack teeth 43 formed at the left side of member 40 rather than at the right side as in the case of member 39.
11 The drilling unit 12 includes a vertical pipe section 12 or sub 44 having a lower externally threaded pin portion 45 13 connectable into the upper end of drill string 15, and having 14 an upper internally threaded box end 46 into which the externally threaded rotatable~ stem 47 of a conventional 16 swivel 48 is connectable. Pipe section 44 contains a vertical 17 passage 49 through which circulating fluid flows downwardly 1 from the stem 47 of the swivel to the drill string for discharge 19 at the location of the bit, and for flow upwardly about the outside of the string during a drilling operation. The 21 non-rotating swivel body 50 has a bail 51 connectable to 22 the suspending hook 52 of a traveling block 53, which is 2 adapted to be raised and lowered in conventional fashion by 24 lines 54 extending about pulley wheels of the traveling block 53 and the upper crown block 55.
26 The rotary pipe section 44 is mounted rotatably to a 27 body 56 of the drilling unit, which body may be formed 28 sectionally as illustrated in Fig. 9 of top and bottom walls 29 57 and 58 and peripheral walls 59 all appropriately bolted or otherwise secured together to define an interior chamber 60 31 within which gears 61 and 62 are mounted. Two oppositely 3~ disposed roller thrust bearings 63 and 64 mount the part 44 .,,~ t~
1 for its desired rotation relative to bodies 56 about vertical 2 axis 13, and gear 61 is rigidly secured to part 44, and 3 keyed rotatively thereto, for rotation wi~h part 44. The 4 second and smaller gear 62 is connected to the drive shaft of a preferably electric motor 65, which is secured to the 6 underside of bottom wall 58 of body 56 with its axis 66 7 extending parallel to vertical axis 13. A brake 67 may be 8 carried at the underside of the motor for applying braking 9 fo-rce to prevent rotation of the motor and the part 44 when desired. This brake may include an externally cylindrical 11 drum 68 ~igidly secured to lower end 69 of ~he motor shaft, 12 with a non-rotating cylindrical housing 70 being disposed 13 about the drum and an annular inflatable bladder 71 being 14 confined within housing 70 and actuating cylindrically curving brake shoes 72 inwardly against drum 68 when the 16 bladder is inflated~
17 The drilling unit is mounted for horizontal sliding 18 movement relative to carriages 28 and 29 along a horizontal 19 axis 73 which is parallel to axes 41 and 141 (Fig. 7). To mount the drilling unit for this purpose, the body 56 of 21 that unit is provided with two oppositely laterally projecting 22 ears 74 and 75, containing guideway passages 76 and 77 within 23 which the two parallel guides 39 and 40 are slidably received.
24 The guideway 76 has a cross-section at locations 176 and 276 to closely slidably receive member 39, with the teeth of a 26 pinion wheel 78 driven by a motor 79 secured to body 56 27 being in engagement with the rack teeth 42 to power actuate 28 body 56 and the carried parts between the full line and broken 29 line positions of Fig. 6. The guideway 77 similarly closely slidably receives member 40, with a pinion 80 driven by a 31 second motor 81 engaging the rack teeth 43 to assist in 3~ powered actuation o the drilling unit between its two Fig. 6 1 positions. These two motors 79 and 81 may be energized in 2 contxolled unison, to drive their pinions simultaneously and 3 at corresponding rates, to thereby apply equal actuating ;
4 forces at opposite sides of the drilling unit. The two motor~
79 and 81 are reversible to power actuate the drilling unit 6 in either direction.
7 The body 56 of the drilling unit is xeleasably retainable 8 in the full line position of Fig. 6, in which rotary pipe 9 section 44 is aligned with and adapted to drive the drill string, with this retention being effected by a pair of latch 11 elements 84 mounted ~y pins 85 attached to ears 74 12 and 75 for swinging movement about parallel vertical axes 13 between the active full line positions of Fig. 7 and the 14 inactive broken line positions of that figure. Springs 86 yieldingly urge the latches to their active full line positions, 16 in which the latches engage vertical pins 87 rigidly secured 17 to the bodies of the carriages 28 and 29. When the drilling 18 unit is moved toward its full line position of Fig. 6, pins 87 19 engage camming surfaces 88 on the latches in a manner deflecting them toward their broken line positions to pass the pins, 21 following which the springs 86 return the latches to their 22 full line positions to then positively retain the drilling 23 unit in its inner position adjacent the carriages. The latch 24 elements may be releasable either manually or by powered means.
To describe the use of the illustrated equipment, assume 26 that the apparatus is initially in the condition of Fig. 1, 27 with the rotary pipe,section 44 of the drilling unit connected 28 threadedly to the upper end of drill string 15, and with the 29 lower track elements 18 in their position of alignment with upper track section9 16. Drilling fluid is supplied to swivel 31 48 through a flexible hose 89 connected to gooseneck 90, and 3~ flows downwardly through section 44 and the drill string to ~ t~
1 the bit. As motor 65 drives member 44 rotatively thro~gh gears 61 and 62, the rotation of element 44 drives the drill string and bit to drill the hole progressively more deeply 4 into the earth. As the drilling unit moves downwardly from 5 the E'ig. 1 position, the carriages 28 and 29 ultimately reach 6 the location of the lower guide rails or tracks 18, and move 7 onto those tracks and are directed downwardly thereby to the 8 Fig. 3 position at which it becomes desirable to connect 9 another stand of drill pipe into the string. With the apparatus in the Fig. 3 condition, the threaded joint between rotary 11 drive section 44 of the drilling unit and the upper section 12 of the drill string is broken, and completely s~un out by 13 left-hand rotation of section 44. The initial 30in~ breaking 14 rotation and the s~inning action may both be attained by an auxiliary joint making and breaking unit, or alternatively 16 the spinning action may be accomplished by utilizing a 17 reversible motor at 65 and reversing its direction of rotation 18 for unscrewing part 44 from the string.
19 After the drilling unit has thus been disconnected from ~ the upper end of the string, as represented in full lines 21 in Fig. 10, the drilling unit is actuated from that position 22 above the upper end of the drill string to the broken line 23 position of Figs. 6 and 10, by releasing latch elements 84 24 an2 energizing motors 79 and 81, so that the pinions driven by those motors act against racks 42 and 43 to shift the 26 drilling unit outwardly. This motion is limited by engagement 2~ of shoulders 89 on ears 74 and 75 with elementsl90 attached 28 to the ends of inclined brace elements 38 and members 39 and 29 40 of the carriages. In that outermost position represented in broken lines in Figs. 6 and 10, the rotary drive pipe 44 31 of the drilling unit is located directly above and in axial 3~ alignment with a stand of pipe 91 located within a mousehole 92 ' 1~
1 (Fiq. 4) formed in front of the pipe string. The axis 93 of 2 this mousehole may extend directly vertically and parallel to 3 the axis 13 of the well and drill pipe, and may be of a 4 depth to contain any desired number of pipe sections connected threadedly together in end to end relation. The present 6 apparatus is not limited to addition of pipe sections as only 7 single joints, but rather may add stands consisting of one, 8 two or three joints.
9 With the drilling unit in its broken line position of Figs. 4, 6 and 10, motor 65 is energized to screw the tubular 11 element 44 of the drilling unit into connection with the 12 upper end-of the-stand of pipe in the mousehole. After such 13 connection, and with the drilling unit still in its outward 14 position of alignment with the mousehole axis 93, the drilling unit is pulled upwardly along guide tracks 18 and onto and 16 along the upper longer guide tracks 16, until the entire length 17 of pipe within the mousehole is moved upwardly out of the 18 mousehole and to a level above the upper end of the drill string 19 This position is illustrated in full lines in Fig. 11. The two motors 79 and 81 are then energized in reverse direction, 21 to move the drilling unit inwardly relative to the carriage 22 structure and to the:broken line position of Fig. 11, so 23 that the pipe sections from the mousehole are now directly 24 above and in alignment with the upper end of the drill string.
The traveling block is then lowered slightly to move the 26 lower pin end of the pipe sections from the mousehole into 27 the upper end of the drill string, following which the threaded 28 connection may be completed by spinning the added pipe section 29 and then torquing it as necessary. After that connection is made, rotation of motor 65 can drive element 44 and the drill 31 string and car~ied bit, while drilling fluid iB forced 32 __ I ` 12 1 ¦ downwardly therethrough, to proceed with the drilling operation, 2 ¦ and with progressive lowering of the drilling unit as in the 3 ¦ first described drilling operation until the Fig. 3 position ¦ is again attained. During downward advancement of the 5 ¦ drilling unit, additional pipe of the desired length can be 6 ¦ placed in the mousehole for connection into the string on 7 the next lengthening operation.
8 ¦ When a round trip of the drill string becomes necessary, 9 ¦ the drilling unit of the present invention may be moved to
10 ¦ an inactive position as represented in Figs. 13 and 14, to
11 ¦ allow the string to be pulled and reinserted into the well
12 ¦ by the traveling block and related equipment. To place the
13 ¦ apparatus in this condition, the drilling unit is first
14 ¦ lowered along the tracks to the position of Fig. 3 in which
15 ¦ the carriages 28 and 29 are connected entirely to the lower
16 ¦ sections 18 of the tracks. The track sections 18 and their
17 ¦ connected parts, including the carriages and the drilling unit,
18 ¦ are then swung about axis 27, as permitted by the pivotal
19 ¦ connections 23, 24, 25, and 26, and to the broken line position
20 ¦ of Fig. 6. Fig. 13 illustrates the parts during such movement,
21 ¦ and Fig. 14 represents the drilling unit in its completely
22 ¦ offset position (broken lines of Fig. 6), with the traveling
23 ¦ block detached from the swivel, and with an elevator 94
24 ¦ suspended by the traveling block to pull the drill string
25 ¦ upwardly to enable detachment of an upper section from the
26 ¦ remainder of the string in conventional manner. An entire
27 ¦ round trip of the string may be performed while the drilling
28 ¦ unit is in its Fig. 14 retracted position, follow~ng which
29 ¦ the drilling unit may be returned to its active position by
30 ¦ swinging of the lower track sections and carried parts to the
31 ¦ Fig. 1 condition for a further drilling operation~
32 ~ t~ 9~
1 ¦ While a certain specific embodiment of the present 2 ¦ invention has been disclosed as typical, the invention is 3 ¦ of course not limited to this particular form, but rather ~ ¦ is applicable broadly to all such variations as fall within 10 I he ffccpe of the appended claims.
l29 I
1 ¦ While a certain specific embodiment of the present 2 ¦ invention has been disclosed as typical, the invention is 3 ¦ of course not limited to this particular form, but rather ~ ¦ is applicable broadly to all such variations as fall within 10 I he ffccpe of the appended claims.
l29 I
Claims (22)
1. Well drilling apparatus comprising:
a drilling unit including an element adapted to be con-nected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said ele-ment and the connected string rotatively about said axis; and means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said guide structure including two elongated guide ele-ments extending essentially parallel to said axis and having up-per and lower portions;
said mounting means including two follower structures carrying said drilling unit and engaging said two guide elements respectively and guided by said elements for movement along said axis, and said mounting means including a connection mounting said lower portion of at least one of said guide elements carrying one of said follower structure, for pivotal movement relative to said upper portions of said elements and about a generally vertical axis in a relation swinging said drilling unit generally horizontally between said positions thereof.
a drilling unit including an element adapted to be con-nected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said ele-ment and the connected string rotatively about said axis; and means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said guide structure including two elongated guide ele-ments extending essentially parallel to said axis and having up-per and lower portions;
said mounting means including two follower structures carrying said drilling unit and engaging said two guide elements respectively and guided by said elements for movement along said axis, and said mounting means including a connection mounting said lower portion of at least one of said guide elements carrying one of said follower structure, for pivotal movement relative to said upper portions of said elements and about a generally vertical axis in a relation swinging said drilling unit generally horizontally between said positions thereof.
2. Well drilling apparatus comprising:
a drilling unit including an element adapted to be con-nected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said ele-ment and the connected string rotatively about said axis; and means movably mounting said drilling unit and includ-ing a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis:
said guide structure including two elongated essential-ly parallel guide elements extending essentially parallel to said axis and having upper and lower portions;
said mounting means including follower structures en-gaging said guide elements and guided thereby for movement axi-ally therealong and carrying said drilling unit;
said follower structures being movable axially between positions of guided engagement with said upper portions or said lower portions of the guide elements;
said mounting means including means rigidly securing said lower portions of the guide elements together, and a pivotal connection mounting said lower portions of the guide elements, carrying said follower structures and said drilling unit, for swinging movement generally transversely of said axis relative to said upper portions of the guide elements and between said drilling and laterally offset portions of the drilling unit.
a drilling unit including an element adapted to be con-nected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said ele-ment and the connected string rotatively about said axis; and means movably mounting said drilling unit and includ-ing a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis:
said guide structure including two elongated essential-ly parallel guide elements extending essentially parallel to said axis and having upper and lower portions;
said mounting means including follower structures en-gaging said guide elements and guided thereby for movement axi-ally therealong and carrying said drilling unit;
said follower structures being movable axially between positions of guided engagement with said upper portions or said lower portions of the guide elements;
said mounting means including means rigidly securing said lower portions of the guide elements together, and a pivotal connection mounting said lower portions of the guide elements, carrying said follower structures and said drilling unit, for swinging movement generally transversely of said axis relative to said upper portions of the guide elements and between said drilling and laterally offset portions of the drilling unit.
3. Well drilling apparatus comprising:
a drilling unit including an element adapted to be con-nected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said ele-ment and the connected string rotatively about said axis;
means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said guide structure including two elongated guide ele-ments extending essentially parallel to one another and to said axis;
said mounting means including two follower structures guided by said guide elements for movement therealong, and slid-ing connections between said drilling unit and said follower structures mounting the drilling unit for movement relative to the follower structures generally transversely of said axis be-tween said drilling and laterally offset positions of the drill-ing unit;
latch elements releasably connecting said drilling unit to said follower structures respectively and retaining the drill-ing unit against movement from said drilling position relative to the follower structures;
two motors carried by said drilling unit; and rack and pinion drives between said motors and said fol-lower structures for powered movement of the drilling unit rela-tive to the follower structures.
a drilling unit including an element adapted to be con-nected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said ele-ment and the connected string rotatively about said axis;
means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said guide structure including two elongated guide ele-ments extending essentially parallel to one another and to said axis;
said mounting means including two follower structures guided by said guide elements for movement therealong, and slid-ing connections between said drilling unit and said follower structures mounting the drilling unit for movement relative to the follower structures generally transversely of said axis be-tween said drilling and laterally offset positions of the drill-ing unit;
latch elements releasably connecting said drilling unit to said follower structures respectively and retaining the drill-ing unit against movement from said drilling position relative to the follower structures;
two motors carried by said drilling unit; and rack and pinion drives between said motors and said fol-lower structures for powered movement of the drilling unit rela-tive to the follower structures.
4. Well drilling apparatus comprising:
a drilling unit including an element adapted to be con-nected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said ele-ment and the connected string rotatively about said axis;
means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said mounting means including means mounting a first portion of said guide structure, carrying said drilling unit, for movement relative to a second portion of said guide structure in a relation moving the drilling unit from said drilling position to said laterally offset position, and additional means mounting said drilling unit for movement generally transversely of said axis relative to said first portion of the guide structure and between said drilling position and a second laterally offset po-sition;
motor means for moving said drilling unit relative to said first portion of the guide structure between said drilling position and said second laterally offset position; and latch means for releasably retaining said drilling unit against movement relative to said first portion of the guide structure between said drilling position and said second lateral-ly offset position.
a drilling unit including an element adapted to be con-nected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said ele-ment and the connected string rotatively about said axis;
means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said mounting means including means mounting a first portion of said guide structure, carrying said drilling unit, for movement relative to a second portion of said guide structure in a relation moving the drilling unit from said drilling position to said laterally offset position, and additional means mounting said drilling unit for movement generally transversely of said axis relative to said first portion of the guide structure and between said drilling position and a second laterally offset po-sition;
motor means for moving said drilling unit relative to said first portion of the guide structure between said drilling position and said second laterally offset position; and latch means for releasably retaining said drilling unit against movement relative to said first portion of the guide structure between said drilling position and said second lateral-ly offset position.
5. Well drilling apparatus comprising;
a drilling unit including an element adapted to be con-nected to the end of a drilling string for rotation therewith a-bout the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis;
means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said guide structure having an upper portion and a low-er portion;
said mounting means including follower means carrying said drilling unit and movable along said guide structure and en-gageable with either said upper portion thereof or said lower por-tion thereof, a connection mounting said lower portion of the guide structure with the follower means and drilling unit for movement between said drilling position and laterally offset po-sition of the drilling unit, the connecting means attaching said drilling unit to said follower means for movement relative to the follower means between said drilling position and a second later-ally offset position of the drilling unit.
a drilling unit including an element adapted to be con-nected to the end of a drilling string for rotation therewith a-bout the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis;
means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said guide structure having an upper portion and a low-er portion;
said mounting means including follower means carrying said drilling unit and movable along said guide structure and en-gageable with either said upper portion thereof or said lower por-tion thereof, a connection mounting said lower portion of the guide structure with the follower means and drilling unit for movement between said drilling position and laterally offset po-sition of the drilling unit, the connecting means attaching said drilling unit to said follower means for movement relative to the follower means between said drilling position and a second later-ally offset position of the drilling unit.
6. Well drilling apparatus as recited in claim 5, in-cluding powered means for actuating said drilling unit between said drilling and second laterally offset positions relative to the folower means, and latch means for releasably retaining the drilling unit against movement from said drilling position rela-tive to the follower means.
7. Well drilling apparatus comprising;
a drilling unit including an element adapted to be connected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis;
(Claim 7 continued) means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said guide structure including two vertically extending parallel tracks having relatively long upper portions and shorter lower portions;
said mounting means including two follower structures carrying said drilling unit and guided by said tracks for movement therealong and receivable in upper positions on said upper por-tions of the tracks and in lower positions on said lower portions of the tracks, means connecting said lower portions of the tracks rigidly together, a pivotal connection mounting said lower portions of the tracks for swinging movement with said follower structures and the drilling unit relative to said upper portions of the tracks and between positions in which said lower portions of the tracks are aligned with said upper portions of the tracks and said drill-ing unit is in its drilling position and said laterally offset position of the drilling unit, and connections between said drill-ing unit and said follower structures mounting the drilling unit for linear movement generally transversely of said axis between said drilling position and a mousehole position of the drilling unit offset from said first mentioned laterally offset position;
motor means for actuating said drilling unit from said drilling position to said mousehole position relative to said follower structures; and two latch elements releasably connecting said drilling unit to said follower structures respectively and retaining the drilling unit against movement from said drilling position rela-tive to the follower structures.
a drilling unit including an element adapted to be connected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis;
(Claim 7 continued) means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means being constructed to mount said drilling unit for movement between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis;
said guide structure including two vertically extending parallel tracks having relatively long upper portions and shorter lower portions;
said mounting means including two follower structures carrying said drilling unit and guided by said tracks for movement therealong and receivable in upper positions on said upper por-tions of the tracks and in lower positions on said lower portions of the tracks, means connecting said lower portions of the tracks rigidly together, a pivotal connection mounting said lower portions of the tracks for swinging movement with said follower structures and the drilling unit relative to said upper portions of the tracks and between positions in which said lower portions of the tracks are aligned with said upper portions of the tracks and said drill-ing unit is in its drilling position and said laterally offset position of the drilling unit, and connections between said drill-ing unit and said follower structures mounting the drilling unit for linear movement generally transversely of said axis between said drilling position and a mousehole position of the drilling unit offset from said first mentioned laterally offset position;
motor means for actuating said drilling unit from said drilling position to said mousehole position relative to said follower structures; and two latch elements releasably connecting said drilling unit to said follower structures respectively and retaining the drilling unit against movement from said drilling position rela-tive to the follower structures.
8. Well drilling apparatus comprising:
a drilling unit including an element adapted to be connected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement between a drilling position in which said element is aligned with and movable along said axis, a second position in which the element can pick up or deposit a length of pipe offset from the axis, and a third position different than said second position in which the drilling unit and said element and motor thereof are retracted to a side of the axis;
said mounting means including an elongated guide struc-ture guiding said drilling unit for said movement along said axis in said drilling position thereof;
said guide structure including two elongated guide elements extending essentially parallel to said axis and along which said drilling unit is movable and having upper and lower portions;
said mounting means including two follower structures carrying said drilling unit and engaging said two guide elements respectively and guided by said elements for movement along said axis, and a connection mounting said lower portion of at least one of said guide elements carrying one of said follower struc-tures for pivotal movement relative to sa-d upper portions of said guide elements and about a generally vertical axis in a re-lation. swinging said drilling unit generally horizontally between said first and third positions thereof.
a drilling unit including an element adapted to be connected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement between a drilling position in which said element is aligned with and movable along said axis, a second position in which the element can pick up or deposit a length of pipe offset from the axis, and a third position different than said second position in which the drilling unit and said element and motor thereof are retracted to a side of the axis;
said mounting means including an elongated guide struc-ture guiding said drilling unit for said movement along said axis in said drilling position thereof;
said guide structure including two elongated guide elements extending essentially parallel to said axis and along which said drilling unit is movable and having upper and lower portions;
said mounting means including two follower structures carrying said drilling unit and engaging said two guide elements respectively and guided by said elements for movement along said axis, and a connection mounting said lower portion of at least one of said guide elements carrying one of said follower struc-tures for pivotal movement relative to sa-d upper portions of said guide elements and about a generally vertical axis in a re-lation. swinging said drilling unit generally horizontally between said first and third positions thereof.
9. Well drilling apparatus comprising:
a drilling unit including an element adapted to be connected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means including a connection mounting a a first portion of said guide structure, carrying said drilling unit, for movement with the drilling unit relative to a second portion of the guide structure in a relation shifting said drilling unit between said drilling position and a laterally offset position in which said drilling unit is shifted to a side of said axis.
a drilling unit including an element adapted to be connected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means movably mounting said drilling unit and including a guide structure which in a predetermined drilling position of the unit guides it for movement along said axis;
said mounting means including a connection mounting a a first portion of said guide structure, carrying said drilling unit, for movement with the drilling unit relative to a second portion of the guide structure in a relation shifting said drilling unit between said drilling position and a laterally offset position in which said drilling unit is shifted to a side of said axis.
10. Well drilling apparatus as recited in claim 9, in which said connection mounts said first portion of said guide structure, carrying said drilling unit, for pivotal movement relative to said second portion of said guide structure in a relation swinging said drilling unit between said positions thereof.
11. Well drilling apparatus as recited in claim 9, in which said connection is a pivotal connection mounting said first portion of said guide structure, carrying said drilling unit, for pivotal movement about a generally vertical axis rela-tive to said second portion of said guide structure in a relation swinging said drilling unit generally horizontally relative to said second portion of the guide structure between said drilling and laterally offset positions.
12. Well drilling apparatus as recited in claim 9, in which said mounting means include a follower structure carrying said drilling unit and engaging said guide structure and guided thereby for movement with the drilling unit along said axis, and which is movable with said first portion of the guide structure and said drilling unit relative to said second portion of the guide structure between said drilling and laterally offset posi-tions of the drilling unit.
13. Well drilling apparatus as recited in claim 9, in which said mounting means include means mounting said drilling unit for movement generally transversely of said axis relative to said first portion of the guide structure and between said drilling position and a second laterally offset position.
14. Well drilling apparatus comprising:
an upwardly projecting drill rig mast;
hoisting mechanism suspended by said mast and operable to support the weight of a drill string extending along a pre-determined axis and move the string upwardly and downwardly;
a mousehole offset from said axis for holding a pipe sec-tion to be added to or which has been removed from the string;
a drilling unit including an element adapted to be connected to the end of the drill string for rotation therewith about said axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means movably mounting said drilling unit and including a plurality of elongated tracks extending essentially parallel to said axis and which in a predetermined drilling position of the unit guide it for movement along said axis;
said mounting means including means mounting a lower port on of at least one of said tracks, carrying said drilling unit, for pivotal movement about a generally vertical axis with the drilling unit relative to an upper portion of the same track in a relation swinging the drilling unit generally horizontally between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis and do not obstruct upward or downward move-ment of said string along said axis by said hoisting mechanism;
said mounting means being constructed to also mount said drilling unit for movement between said drilling position and a second laterally offset position different than said first laterally offset position and in which said element is above and aligned with said mousehole.
an upwardly projecting drill rig mast;
hoisting mechanism suspended by said mast and operable to support the weight of a drill string extending along a pre-determined axis and move the string upwardly and downwardly;
a mousehole offset from said axis for holding a pipe sec-tion to be added to or which has been removed from the string;
a drilling unit including an element adapted to be connected to the end of the drill string for rotation therewith about said axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means movably mounting said drilling unit and including a plurality of elongated tracks extending essentially parallel to said axis and which in a predetermined drilling position of the unit guide it for movement along said axis;
said mounting means including means mounting a lower port on of at least one of said tracks, carrying said drilling unit, for pivotal movement about a generally vertical axis with the drilling unit relative to an upper portion of the same track in a relation swinging the drilling unit generally horizontally between said drilling position and a laterally offset position in which said drilling unit and said element and motor thereof are shifted to a side of said axis and do not obstruct upward or downward move-ment of said string along said axis by said hoisting mechanism;
said mounting means being constructed to also mount said drilling unit for movement between said drilling position and a second laterally offset position different than said first laterally offset position and in which said element is above and aligned with said mousehole.
15. Apparatus for drilling a well along a predetermined axis by rotation of a drill string about said axis comprising:
an upwardly projecting drill rig mast;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said means being constructed to also mount said drilling unit for lateral movement relative to said mast along a first path from said drilling position to a first laterally offset position at a first side of said axis in which the drilling unit does not obstruct movement of the drill string into or out of the well along said axis by other equipment suspended from the mast, and for additional lateral movement relative to the mast along a second path to a second laterally offset position, at a second side of said axis in which said element can pick up a length of pipe offset from said axis;
said mounting means including means mounting a first portion of said guide structure carrying said drill-ing unit for movement relative to a second portion thereof in a relation moving said drilling unit to one of said laterally offset positions.
an upwardly projecting drill rig mast;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said means being constructed to also mount said drilling unit for lateral movement relative to said mast along a first path from said drilling position to a first laterally offset position at a first side of said axis in which the drilling unit does not obstruct movement of the drill string into or out of the well along said axis by other equipment suspended from the mast, and for additional lateral movement relative to the mast along a second path to a second laterally offset position, at a second side of said axis in which said element can pick up a length of pipe offset from said axis;
said mounting means including means mounting a first portion of said guide structure carrying said drill-ing unit for movement relative to a second portion thereof in a relation moving said drilling unit to one of said laterally offset positions.
16. Apparatus for drilling a well along a predetermined axis by rotation of a drill string about said axis comprising:
an upwardly projecting drill rig mast;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said means being constructed to also mount said drilling unit for lateral movement relative to said mast along a first path from said drilling position to a first laterally offset position at a first side of said axis in which the drilling unit does not obstruct movement or the drill string into or out of the well along said axis by other equipment suspended from the mast, and for additional lateral movement relative to the mast along a second path to a second laterally offset position, at a second side of said axis in which said element can pick up a length of pipe offset from the axis;
said mounting means including means mounting a first portion of said guide structure near the lower end thereof carrying said drilling unit for pivotal movement relative to an upper portion of the guide structure and about a generally vertical axis in a relation swinging the drilling unit generally horizontally between said drilling position and said first laterally offset position.
an upwardly projecting drill rig mast;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said means being constructed to also mount said drilling unit for lateral movement relative to said mast along a first path from said drilling position to a first laterally offset position at a first side of said axis in which the drilling unit does not obstruct movement or the drill string into or out of the well along said axis by other equipment suspended from the mast, and for additional lateral movement relative to the mast along a second path to a second laterally offset position, at a second side of said axis in which said element can pick up a length of pipe offset from the axis;
said mounting means including means mounting a first portion of said guide structure near the lower end thereof carrying said drilling unit for pivotal movement relative to an upper portion of the guide structure and about a generally vertical axis in a relation swinging the drilling unit generally horizontally between said drilling position and said first laterally offset position.
17. Apparatus as recited in claim 16, in which said means mounting said drilling unit for movement relative to said mast include means mounting said drilling unit for movement relative to said first portion of the guide struc-ture to said second laterally offset position.
18. Apparatus as recited in claim 15, in which said mounting means include means mounting said drilling unit for movement relative to said first por-tion of the guide structure to said second laterally offset position.
19. Well drilling apparatus comprising:
an upwardly projecting drill rig mast;
hoisting mechanism suspended by said mast and operable to support the weight of a drill string extending along a predetermined axis and move the string upwardly and downwardly;
a mousehole offset from said axis for holding a pipe section to be added to or which has been removed from the string;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said means being constructed to also mount said drilling unit for lateral movement relative to said mast along a first path from said drilling position to a first laterally offset position at a first side of said axis in which the drilling unit does not obstruct movement of the drill string into or out of the well along said axis by said hoisting mechanism sus-pended from the mast, and for additional lateral movement relative to the mast along a second path to a second laterally offset position, different than said first laterally offset position and at a second side of said axis, and in which said element is above and aligned with said mousehole;
said guide structure being constructed to guide said drilling unit for movement axially of said mousehole in said second laterally offset position of the drilling unit.
an upwardly projecting drill rig mast;
hoisting mechanism suspended by said mast and operable to support the weight of a drill string extending along a predetermined axis and move the string upwardly and downwardly;
a mousehole offset from said axis for holding a pipe section to be added to or which has been removed from the string;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said means being constructed to also mount said drilling unit for lateral movement relative to said mast along a first path from said drilling position to a first laterally offset position at a first side of said axis in which the drilling unit does not obstruct movement of the drill string into or out of the well along said axis by said hoisting mechanism sus-pended from the mast, and for additional lateral movement relative to the mast along a second path to a second laterally offset position, different than said first laterally offset position and at a second side of said axis, and in which said element is above and aligned with said mousehole;
said guide structure being constructed to guide said drilling unit for movement axially of said mousehole in said second laterally offset position of the drilling unit.
20. Apparatus as recited in claim 19, including powered means for moving said drilling unit between said drilling position and said second laterally offset position.
21. Apparatus for drilling a well by rotation of a drill string about an axis comprising:
an upwardly projecting drill rig mast;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said mounting means including a connection mounting at least a portion of said guide structure, carrying said drilling unit, for movement with the drilling unit relative to said mast in a relation shifting said drilling unit between said drilling pos-ition and a laterally offset position in which said drilling unit is shifted to a side of said axis.
an upwardly projecting drill rig mast;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said mounting means including a connection mounting at least a portion of said guide structure, carrying said drilling unit, for movement with the drilling unit relative to said mast in a relation shifting said drilling unit between said drilling pos-ition and a laterally offset position in which said drilling unit is shifted to a side of said axis.
22. Well drilling apparatus comprising:
an upwardly projecting drill rig mast;
hoisting mechanism suspended by said mast and operable to support the weight of a drill string extend-ing along a predetermined axis and move the string upwardly and downwardly;
a mousehole offset from said axis for holding a pipe section to be added to or which has been removed from the string;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said means being constructed to also mount said drilling unit for lateral movement relative to said mast along a first path from said drilling position to a first laterally offset position at a first side of said (Claim 22 continued) axis in which the drilling unit does not obstruct movement of the drill string into or out of the well along said axis by said hoisting mechanism suspended from the mast, and for additional lateral movement relative to the mast along a second path to a second laterally offset position, different than said first laterally offset position and at a second side of said axis, and in which said element is above and aligned with said mousehole;
said guide structure being constructed to guide said drilling unit for movement axially of said mousehole in said second laterally offset position of the drilling unit;
said means including means mounting at least a portion of said guide structure carrying said drilling unit for movement with the drilling unit relative to said drill rig mast in a relation moving said drilling unit to one of said laterally offset positions.
an upwardly projecting drill rig mast;
hoisting mechanism suspended by said mast and operable to support the weight of a drill string extend-ing along a predetermined axis and move the string upwardly and downwardly;
a mousehole offset from said axis for holding a pipe section to be added to or which has been removed from the string;
a drilling unit including an element adapted to be connected to the end of said drill string for rota-tion therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; and means mounting said drilling unit for movement relative to said mast and including an elongated guide structure which in a predetermined drilling position of the unit guides it for movement along said axis to drill a well;
said means being constructed to also mount said drilling unit for lateral movement relative to said mast along a first path from said drilling position to a first laterally offset position at a first side of said (Claim 22 continued) axis in which the drilling unit does not obstruct movement of the drill string into or out of the well along said axis by said hoisting mechanism suspended from the mast, and for additional lateral movement relative to the mast along a second path to a second laterally offset position, different than said first laterally offset position and at a second side of said axis, and in which said element is above and aligned with said mousehole;
said guide structure being constructed to guide said drilling unit for movement axially of said mousehole in said second laterally offset position of the drilling unit;
said means including means mounting at least a portion of said guide structure carrying said drilling unit for movement with the drilling unit relative to said drill rig mast in a relation moving said drilling unit to one of said laterally offset positions.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16775880A | 1980-07-14 | 1980-07-14 | |
| US6/167,758 | 1980-07-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1157007A true CA1157007A (en) | 1983-11-15 |
Family
ID=22608705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000377872A Expired CA1157007A (en) | 1980-07-14 | 1981-05-20 | Well drilling apparatus |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5748094A (en) |
| CA (1) | CA1157007A (en) |
| DE (1) | DE3125013C2 (en) |
| FR (1) | FR2486584A1 (en) |
| GB (1) | GB2079817B (en) |
| NO (1) | NO157988C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4421179A (en) * | 1981-01-23 | 1983-12-20 | Varco International, Inc. | Top drive well drilling apparatus |
| GB2178780A (en) * | 1985-08-05 | 1987-02-18 | Vetco Offshore Ind Inc | Side drive drilling |
| CA1335732C (en) * | 1989-02-08 | 1995-05-30 | Allan S. Richardson | Drilling rig |
| IT227642Y1 (it) * | 1992-09-23 | 1997-12-15 | Soilmec Spa | Attrezzatura di stivaggio e manovra delle aste per impianti di trivel- lazione. |
| DE69220014T2 (en) * | 1991-12-24 | 1997-11-20 | Soilmec Spa | Hydraulic drill with telescopic tower |
| US6082225A (en) * | 1994-01-31 | 2000-07-04 | Canrig Drilling Technology, Ltd. | Power tong wrench |
| US5755296A (en) * | 1994-09-13 | 1998-05-26 | Nabors Industries, Inc. | Portable top drive |
| NO301435B1 (en) * | 1995-10-20 | 1997-10-27 | Tom Toralv Roeynestad | Device at drilling rig with drill tower |
| US5921329A (en) * | 1996-10-03 | 1999-07-13 | Sundowner Offshore Services, Inc. | Installation and removal of top drive units |
| IT1292791B1 (en) * | 1997-06-20 | 1999-02-11 | Soilmec Spa | MANEUVERING EQUIPMENT FOR AUCTIONS USED IN DRILLING SYSTEMS |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2792198A (en) * | 1953-03-30 | 1957-05-14 | Longyear E J Co | Portable drill rig |
| US3302735A (en) * | 1964-07-31 | 1967-02-07 | Ingersoll Rand Co | Rock drilling apparatus |
| AU410508B1 (en) * | 1966-03-09 | 1971-02-10 | Odgers Drilling Inc | Drill rig |
| FR92130E (en) * | 1966-06-30 | 1968-09-27 | Benoto Sa | Apparatus for transforming a drill, of any type, into a rotary drill |
| US3685596A (en) * | 1970-10-29 | 1972-08-22 | Robert A Collins | Method and means for boring earth |
| AU460673B2 (en) * | 1971-04-30 | 1975-04-16 | Longyear (Australia) Pty. Ltd | Dual purpose drill rig |
| US3758059A (en) * | 1971-10-06 | 1973-09-11 | Mindrill Ltd | Drilling apparatus |
| US3835940A (en) * | 1973-03-23 | 1974-09-17 | Smith International | Earth drilling apparatus and method |
| US4371041A (en) * | 1978-09-15 | 1983-02-01 | Drill Systems, Inc. | Multi-purpose mobile drill rig |
| GB2043745B (en) * | 1979-03-09 | 1982-12-22 | Hydraulic Drilling Equipment L | Carriage for mounting a rotary head on a drilling rig |
| US4262754A (en) * | 1979-05-15 | 1981-04-21 | Southern Iowa Manufacturing Co. | Rotary drilling device with pivoting drill head assembly |
-
1981
- 1981-05-20 CA CA000377872A patent/CA1157007A/en not_active Expired
- 1981-06-10 GB GB8117831A patent/GB2079817B/en not_active Expired
- 1981-06-17 NO NO812046A patent/NO157988C/en not_active IP Right Cessation
- 1981-06-25 DE DE3125013A patent/DE3125013C2/en not_active Expired
- 1981-07-06 FR FR8113230A patent/FR2486584A1/en active Granted
- 1981-07-14 JP JP56109913A patent/JPS5748094A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5748094A (en) | 1982-03-19 |
| NO157988B (en) | 1988-03-14 |
| GB2079817B (en) | 1985-01-16 |
| GB2079817A (en) | 1982-01-27 |
| FR2486584A1 (en) | 1982-01-15 |
| FR2486584B1 (en) | 1984-10-12 |
| NO157988C (en) | 1988-06-22 |
| JPS612152B2 (en) | 1986-01-22 |
| DE3125013A1 (en) | 1982-03-25 |
| NO812046L (en) | 1982-01-15 |
| DE3125013C2 (en) | 1984-09-20 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |