US2274273A

US2274273A - Well spider

Info

Publication number: US2274273A
Application number: US378699A
Authority: US
Inventors: Earl J Miller
Original assignee: Bethlehem Steel Corp
Current assignee: Bethlehem Steel Corp
Priority date: 1941-02-13
Filing date: 1941-02-13
Publication date: 1942-02-24
Anticipated expiration: 1959-02-24

Description

E. -J. MILLER WELL SPIDER Feb.4 24, 1942.

wkmwm. Sw Nm@ Earl J. Willen Filed Feb. I3, 1941 Patented Feb. 24, 1942 WELL SPIDER.

Earl J. Millelgethlehem, Pa., assignor to Bethlehem Steel Company, a corporation of Penn- Sylvania Application February 13, 1941, seria1No.37s,s99

(o1. 2li- 263) 19 Claims.

My invention relates to new and useful improvements in casing and tubing spiders of the type used in oil eld operations, and particularly to a rugged and dependable spider which will operate automatically in sudden emergencies.

It is, of course, obvious and well known that a long string of casing, when suspended freely in a petroleum well of great depth, is an object of tremendous weight. A 15,000 foot string of 6- inch outside diameter casing, for example, is equivalent to a dead load of 330,000 pounds or 165 tons. During lowering and raising operations a spider may be continually called upon to support virtually the whole weight of such a string of casing while the topmost joints are being connected to or disconnected from the string. In addition, the lowering or raising of such a weight is difficult and dangerous, and a break in the lifting means, without somey such apparatus as the spider, might result in the loss beyond recovery or at least considerable damage to the whole expensive string of casing, followed by a costly fishing job ending perhapsfin entirely abandoning the well and redrilling. Months of work might then be rendered fruitless.

A spider is thus a device which will permit ready passage of well casing and couplings while operations are proceeding normally, but which will quickly and firmly grasp the casing when required, as in cases of sudden emergency. The gripping portions of a spider comprise the slips, two or more wedge-shaped pieces of steel, arcuate in form, with roughened tooth-like interior surfaces. The spider itself consists of a base, usual- 1y of cast steel, containing a tapered aperture in which the slips are contained, and operating means to release or engage the slips as needed. Such operating means have hitherto been of great variety, very often with springs or other undependable parts, and nearly all have been known to jam occasionally at critical' moments. My invention reduces this possibility to a minimum.

a smooth and more easily operated means of imparting motion of translation to the slips.

My invention having been thus generally described, I shall now in order to make my detailed description more clear refer to the sheet of drawings hereto annexed, in which like characters of reference indicate like parts, and which I desire to be read and considered asa part of this specification.

Figure 1 is a top plan view of an automatic well spider constructed in accordance with my invention;

Fig. 2 is a vertical longitudinal section; and

Fig. 3 is an end elevation thereof.

The base or body I of the spider is, as shown, preferably a one-piece box type steel casting, having transverse webs 2 and 3 if extreme strength is needed, and dispensing with said webs if a lighter weight spider isdesired. The spider is provided with protecting cover plates 4 and 5, slotted as at 6, 'I and 8 to allow necessary freedom to projecting operating parts, and fastened to the base by lag screws 9. Tracks or guideways I Il and I I are formed by welding or similarly attaching side plates I2 to which are welded bottom plates I3 centrally and longitudinally to the underside of each cover plate. Means of coupling with crane or elevator links (not shown) are afforded by lugs I4 and openings I5 in the base and openings I6 in the cover plates.

The downwardly decreasing hollow interiorly, uniformly tapered portion or bowl of the spider is shown at I1, and therein keyways I8 receive dovetailed keys I9 of driving slips 20 and 2| and floating

slips

22 and 23 with taper corresponding to the bowl. Said dovetailed keys seat upon ring seats 24, and are rigid enough to permit the spider to be used in place of back-up tongs whenever the string of casing 25 is sufliciently heavy not to turn in the slips, though their primary purpose is `to prevent rotation of the slips while allowing them full freedom for vertical reciprocation.

'Ihe inner faces of the tapered slips 20, 2|, 22 and 23 are deeply serrated as at 26 for firmer gripping of the casing 25. Said slips are also preferably of steel, cast or forged, cored and ribbed as at 2'I and 28 to reduce excess weight to Va minimum, and beveled at top and bottom as at 29 and 30 to lessen the possibility that a coupling might hang onto the slips while the casing is being raised or lowered.

Horizontally disposed dowel pins 3I secured to driving slips 20 and 2| and fitting loosely in aligned openings 32 of

floating slips

22 and 23 allow the slips to` be raised or lowered together and provide convenient points of engagement for lifting hooks or the like `when removing the slips from the bowl for changes or repairs. Goosenecks 33 and 34, projectingthrough cover slots 6 and l, are attached to driving slips 20 and 2I in recesses 35 of said slipsby pins 36, said pins being readily removable to permit quick changes of the slips to accommodate different sizes of casing or the like. When the slips are raised or lowered in use the opposite ends of said goosenecks move easily in tracks or guideways I and ll on rollers 31 attached to the goosenecks by shafts 38 in tubular end portions 39.

Projecting angularly from the spider through cover slot 8 is a. handle 40, of wood or other convenient material, which has its lower end seated in the socket of a lever 4| which is provided with

bell crank arms

42 and 43 and is mounted to rotate on the transverse shaft 44, being fas-V tened thereto by means of a setv screw 45. Said transverse shaft 44 is journaled in openings 46 in the sides of the base casing and is retained in position by means of set

collars

41 and 48. Clevises at each end of link 49 fastened by pins 50 and 5| connect bell crank arm 42 of the lever 4| to gooseneck 33. Integral clevis bell crank arm 43 of the lever 4l fastens by set screw 52- to pin 53 on which pivots by means of tapped coupling 54 the threaded connecting rod 55. This rod in turn is threaded onto coupling 53, pivoting on pin 51 in inverted bell crank 58. Said bell crank is fastened centrally by set screw 59 to transverse shaft 60 journaled in openings 6l in the sides of the base and is retained therein by set collars 62 and 63'. Clevises at each end of' link 64 fastened by

pins

65 and 66 connect end 61 of bell crank 58 to gooseneck 34.

Casing 25 cannot be dropped or lowered until handle 40 is drawn back since the weight of the casing and slips will normally hold the casing in position in the spider without manual attention. To release the casing the handle is retracted, which lifts the inner ends of

goosenecks

33 and 34 to raise simultaneously the driving slips 20 and 2|' and the connected

floating slips

22 and 23.

While for purposes of illustration I have described this invention in considerable detail, I wish it clearly understood that I may use if I so desire any or all such substitutions, modifications or equivalents thereof as are emb-raced within the scope of the invention or as are pointed out in the claims.

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is: l

1. A well spider comprising an elongated supporting base, a uniformly tapered bowl formed in the supporting base, gripping slips mounted in said bowl, a supporting'member pivoted to the slips at opposite sides of the bowl, a track for supporting and guiding the opposite end of each of the supporting members, and means connected to the intermediate portion of each supporting member for moving the slips upwardly and downwardly in the bowl.

2. A well spider comprising an elongated supporting base, a uniformly tapered bowl formed in the supporting base, gripping slips mounted in said' bowl, a curved arm pivoted to the slip at opposite sides of the bowl, a. track for supporting and guiding the opposite end of each of the curved arms, operating means connected to the intermediate portion of each curved arm for portion of each supporting member for moving the slips upwardly and downwardly in the bowl.

4. A well spider comprising a one-piece supporting base, a uniformly tapered bowl formed in the supporting base, gripping slips mounted v in said bowl, lifting members pivoted to the slips moving the slips upwardly and downwardly in at opposite sides of the bowl, rollers attached at the opposite end of each of the lifting members for supporting the same and means connected to the lifting members for vertically reciprocating the slips.

5. A well spider comprising a one-piece supporting base, an interiorly uniformly tapered bowl formed in the supporting base, quadrant gripping slips mounted in said bowl, gooseneck arms pivoted to the slips at opposite sides of the bowl, a track for guiding and supporting the opposite end of each of the gooseneck arms, and means connected to the intermediate portion of each gooseneck arm for upwardly and downwardly reciprocating the slips as required.

6. A well spider comprising a one-piece supporting base, a uniformly downwardly tapered bowl formed in the supporting base, gripping slips mounted in said bowl, gooseneck arms each pivoted to a slip at opposite sides of the bowl', rollers attached to the opposite ends of each of the gooseneck arms for movably supporting the same, a track for guiding the rollers, and means connected to the intermediate portion of each gooseneck arm for upwardly and downwardly reciprocating the slips.

'1. A well spider comprising an elongated substantially rectangular supporting base, a uniformly tapered bowl formed in the supporting base, gripping slips mounted in said bowl, a gooseneck arm pivoted to a slip at opposite sides of the bowl, rollers attached to the opposite ends of each of the gooseneck arms for movably supporting the same, protecting cover plates slottedA to admit the gooseneck arms, tracks for guiding the rollers attached beneath the cover plates, and means connected to the intermediate portion of each gooseneck arm for upwardly andl downwardly reciprocating the slips.

8. A well spider comprising an elongated substantially rectangular supporting base, a uniformly tapered bowl formed therein, gripping slips mounted in said bowl, gooseneck arms provided with tubular end portions pivoted at the other ends to slips at opposite sides of the bowl, shafts rotatably mounted in the tubular end portions, rollers on the ends of said shafts for movably supporting the gooseneck arms, tracks for guiding the rollers, and means connected to the intermediate portion of each gooseneck arm for upwardly and downwardly reciprocating the slips.

9. A well spider comprising an elongated substantially rectangular supporting base, a uniformly tapered bowl formed in the supporting base, gripping slips mounted in said bowl, supporting members pivoted to the slips at opposite sides of the bowl, a track comprising a bottom and side plates for guiding the opposite ends of each of the supporting members, and means connected to the intermediate portion of each supporting member for moving the slips upwardly and downwardly in the bowl.

10. A well spider comprising a substantially rectangular supporting base, a uniformly downwardly tapered bowl formed in the supporting base, gripping slips mounted in said bowl, supporting members pivoted to the slips at opposite sides of the bowl, partially enclosed box-like trackways for guiding the opposite ends of each of the supporting members, and means connected member for moving the slips upwardly and downwardly in the bowl.

11. A well spider comprising a substantially rectangular supporting base, a uniformly downwardly tapered bowl formed in the supporting base, gripping slips mounted in said bowl, supporting members pivoted to the slips at opposite sides of the bowl, cover plates for protecting the interior of the spider, a track disposed below and parallel to each cover plate for guiding the opposite ends of each of the supporting members, and means connected to the intermediate portion of each supporting member for moving the slips upwardly and downwardly in the bowl.

12. A well spider comprising a substantially rectangular supporting base, a uniformly downwardly tapered bowl formed in the supporting base, gripping slips mounted in said bowl, supporting members pivoted to the slips at opposite sides of the bowl, cover plates for protecting the interior of the spider, a trackway made integral with the cover plate by welding or the like for guiding the opposite ends of each of the supporting members, and means connected to the intermediate portion of each supporting member for moving the slips upwardly and downwardly in the bowl.

13. A well spider comprising a supporting base of substantially rectangular horizontal section, a uniformly downwardly convergent bowl formed in the supporting base, gripping slips mounted in said bowl, supporting members pivoted to the slips at opposite sides of the bowl, cover plates for protecting the spider, a longitudinal trackway adapted for guiding the opposite end of each of the supporting members, and means connected to the intermediate portion of each supporting member for moving the slips upwardly and downwardly in the bowl. f

14. A well spider comprising a supporting base of substantially rectangular horizontal section, a uniformly downwardly convergent bowl formed inthe supporting base, gripping slips mounted in the said bowl, dovetail keys on the slips to prevent the rotation thereof, keyways in the bowl for engaging the dovetail keys, seatsy for supporting the dovetail keys, a lifting member pivoted to the slips, a track for guiding the opposite end of rectangular supporting base, a uniformly downwardly convergent bowl formed in the supporting base, quadrant grippingA slips mounted in said bowl, bevels at top andA bottom vof. each slip to permit freer passage through the slips, a supporting member pivoted to the slipsv at opposite sides of the bowl, a track for guiding the opposite end of each of the supporting members, and means connected to the intermediate portion of each supporting member for moving the slips upwardly and downwardly in the bowl.v

16. A well spider comprising a substantially rectangular supporting base, a uniformly, interiorly tapered bowl formed therein, tapered interlocking slips beveled at the top and bottom within said bowl, gooseneck arms pivotally connected at one end of each arm to said slips, a roller at the other end of each gooseneckV arm, tracks for guiding the rollers, an operating lever mounted pivotally on the base, an inverted lever arm also mounted pivotally on the base at the opposite end, means connecting the operating lever with the inverted lever arm, and means connecting the operating lever and inverted lever arm with their respective gooseneck arms for simultaneously raising or lowering the slips to release or grip any inserted tubular object as desired.

17. A well spider comprising a substantially rectangular base frame, a uniformly, interiorly tapered bowl therein, correspondingly tapered interlocking slips within the bowl, gooseneck arms connected to said slips, rollers at the other end of each gooseneck arm, protecting cover plates above the frame, guideways formed integral with the cover plates to direct the movement of the rollers, an operating lever mounted pivotally in the frame, a lever arm similarly mounted at the other end of the frame and invertedwith relation to the operating lever,.` rigid linking means connecting operating lever with inverted lever arm, and linking means connecting operating lever and inverted lever arm with their respective gooseneck arms for simultaneously raising and releasing the slips.

18. A well spider comprising a supporting boxlike base, a bowl formed therein converging uniformly within from top to bottom, vertical side walls formed integrally with said base and bowl, driving and floating slips inserted within said bowl, dowel pins connecting said slips, gooseneck arms pivotally connected to the driving slips, rollers at the far end of each such arm supporting said arm, guideways in which the rollers may roll freely, openings in the said vertical side walls, transverse shafts journaled pivotally in said openings, an operating lever provided with bellcrank arms mounted pivotally on one shaft, a bell-crank mounted pivotally on the other shaft and inverted with vrelation to the operating lever, rigid means connecting the upper bell-crank arm of the operating lever with the lower arm of the inverted bell crank, means connecting the lower bell-crank arm of the operating lever with the adjacent gooseneck arm, and means connecting the upper arm of the inverted bell-crank with the gooseneck arm adjacent thereto.

19. A well spider comprising a base frame having transverse bracing bottom webs, a central uniformly, interiorly tapered bowl therein, tapered `interlocking serrated quadrant slips within said bowl, gooseneck arms connected pivotally to said slips, a roller at the other end of each gooseneck arm, guideways in which the rollers may roll freely, openings in the sides of the base frame, transverse shafts journaled in said openings,`set-collars holding said shafts in position, an operating lever mounted pivotally on one transverse shaft, a bell-crank mounted pivotally on the other transverse shaft and inverted with relation to the operating lever, a rod connecting `operating lever with the bell-crank, and connecting links from operating lever and bell-crank to their respectively adjacent gooseneck arms for simultaneously raising and releas-