US3742562A - Well pipe supporting unit - Google Patents
Well pipe supporting unit Download PDFInfo
- Publication number
- US3742562A US3742562A US00186096A US3742562DA US3742562A US 3742562 A US3742562 A US 3742562A US 00186096 A US00186096 A US 00186096A US 3742562D A US3742562D A US 3742562DA US 3742562 A US3742562 A US 3742562A
- Authority
- US
- United States
- Prior art keywords
- slips
- posts
- movement
- cam
- supporting unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/02—Rod or cable suspensions
- E21B19/06—Elevators, i.e. rod- or tube-gripping devices
- E21B19/07—Slip-type elevators
Definitions
- Green ABSTRACT A unit for supporting a well pipe and including a body structure carrying a plurality of pipe gripping slips which are supported by individual vertically movable r carriers preferably taking the form of upwardly projecting and vertically moveable posts. These carriers are actuable by an essentially annular cam which is shiftable arcuately about the axis of the gripped pipe by power actuated means.
- the slips are suspended from the carriers in a manner enabling the slips to move radially outwardly to laterally retracted positions as they are shifted upwardly. 7
- the present invention provides an improved well pipe supporting unit which is especially well adapted for supporting these extremely long strings of casing or .the suspended pipe. Similarly, the casing may in some other well pipe.
- the mechanical construction and method of operation of these supporting units are such as to maximize the load supporting capacity of the units while avoiding an excessive increase in their size or weight.
- the devices are very positively and quickly actuable by built-in powered means between gripping and released conditions. Certain particular features of the invention relate to a preferred manner in which the slips may be cammed inwardly toward a pipe first at a relatively rapid rate to effectively center the pipe in the device, and then at a reduced rate to set the slips in final gripping condition.
- a unit embodying the inven-' tion includes a slip actuating cam structure which extends and moves arcuately about the'axis of the gripped pipe.
- a plurality of slips are mounted movably to the body of the device by individual carrier parts, preferably taking the form of vertically moveable posts slidably received within and projecting upwardly from mounting sockets or guideways in the body structure.
- the body structure is formed as a plurality of body sections which are openable to a condition allowing removal of the unit laterally from about a pipe, and the cam structure may be formed similarly as a plurality of sections mounted to the various body sections respectively.
- Piston and cylinder mechanisms or other power units are mounted on the different body sections for actuating the corresponding cam sections relative thereto.
- FIG. 1 is a somewhat diagrammatic representation of a portion of a well drilling rig having an elevator constructed in accordance with the invention
- FIG. 2 is a fragmentary perspective view of the elevator of FIG. 1, with one-half of the upper cover removed to reveal the inner mechanism of the apparatus;
- FIG. 3 is a plan view of the elevator taken on line 33 of FIG. 1;
- FIG. 4 is an enlarged horizontal section taken on line 4-4 of FIG. 2 just beneath the top wall of the cover part;
- FIG. 5 is an enlarged fragmentary vertical section taken on line 5-5 of FIG. 4;
- FIG. 5a is a horizontal section taken on line 5a'-5a of FIG. 5;
- FIG. 6 is a fragmentary view similar to a portion of FIG. 4, but showing the slips in their retracted positions;
- FIG. 7 is a fragmentary vertical section taken on line 77 of FIG. 6;
- FIG. 8 is a fragmentary vertical section taken on line 8-8 of FIG. 7;
- FIG. 9 is a fragmentary view of the cam taken essentially on line 9-9 of FIG. 5;
- FIG. 10 is a view similar to FIG 9 but taken on line 10-10 of FIG. 7;
- FIG. 11 is an enlarged fragmentary vertical section taken on line 1111 of FIG. 4;
- FIG. 12 is a view taken on line 1212 of FIG. 4.
- FIG. 13 is a fragmentaryvertical section taken on line 1313 of FIG. 5.
- FIG. 1 I have shown at 10 a well pipe supporting unit constructed in accordance with the invention and illustrated as it appears when in use as an elevator, for suspending and moving vertically a string of easing or other well pipe, .the upper stand of which is represented at 11.
- the casing extends downwardly along a vertical axis 12 through the usual rotary table represented diagrammatically at 13, and into the well.
- Elevator 10 is itselfsuspended and actuated upwardly and downwardly by the conventional hoisting mechanism of the rig, including a power actuated block and tackle 14 whose traveling block 15 carries a main hook 16 having two smaller side hooks 16a supporting the elevator through a pair of vertical support rods 18.
- support rods 18 may be detached from the remainder of the unit, and the unit may then be supported on the rotary table in appropriate manner to suspend the pipe 11 in stationary position.
- Unit 10 includes a generally annular rigid and very strong body 19 extending about the suspended casing 11 and its axis 12, and preferably consisting of two identical complementary essentially semicircular halves or sections 20 and 21 meeting'in the vertical diametrical plane represented at 22 in FIG. 4.
- these body sections have interfitting connector or hinge lugs 23 (see FIG. 12), containing vertically aligned registering cylindrical apertures or passages 24 within which two vertical externally cylindrical hinge or connector pins 25 are removably received to releasably secure the two body sections together in their FIG. 4 assembled relation.
- These pins 25 are centered about and extend vertically along two parallel vertical axes 26 and 27 (FIG.
- Pins 25 are of course close fits within the apertures 24, and may have slightly enlarged upper heads 28 limiting downward movement of the pins relative to the body sections in the FIG. 12 assembled condition of the parts, with one or both of the pins desirably having a loop or bail 29 at its upper end by which the pin may be grasped to pull it upwardly from the body sections and thus detach the body sections for removal laterally from about the casing.
- body sections 20 and 21 carry two identical upstanding suspension lugs 30 and 31, having aligned openings 32 receiving a horizontal pin 33 about which a lower eye portion 34 of one of the rods 18 is received in suspending relation.
- a spacer bushing 35 may be received about each of the pins 33 and between lugs 30 and 31, with pin 33 desirably having an enlarged head 36 at one of its ends adapted to be detachably connected to the associated lug 31 by a screw or other fastener 37.
- the two body sections will ordinarily be left in their connected assembled condition, with the body and carried parts being removed from about the casing by withdrawing unit upwardly past the upper end of the casing. If circumstances arise in which it becomes necessary to remove the unit 10 from about the casing by movement in a lateral direction, the two'pins 33 maybe detached from the body sections, and one of the vertical pins 25 may then be withdrawn upwardly out of its position of connection to the hinge or connector lugs 23, to thus release the two body sections and 21 for relative opening or swinging movement about the second of the two vertical pins as a hinge, and to an open position such as that represented in broken lines in FIG. 3, in which the entire unit may be easily moved laterally from about the casing.
- the two body sections 20 and 21 carry two complementary semicircular downwardly projecting centering or locating elements 38, suitably secured to the body sections as by bolts 39, and having downwardly flaring frustoconical portions 40 which are engageable with the upper end of the casing as the unit 10 is moved downwardly about the casing, to automatically deflect the unit 10 laterally to a properly centered relation with respect to the pipe.
- the two semicircular elements of course meet or substantially meet in the same plane 22 of FIG. 4 in which the body sections 20 and 21 meet.
- slips 41 At their radially outer sides, slips 41 have downwardly tapering frustoconical wedge surfaces 43, 44, and 45 which engage correspondingly shaped wedge surfaces 46, 47, and 48 (FIG. 5) on the body sections 20 and 21, to cam or wedge the slips radially inwardly relative to the body section upon'downward movement of the slips, and thus support the casing.
- the camming surfaces on the slips and body sections are formed in stepped fashion, as seen in FIG. 5, so that when the slips are moved upwardly a relatively short distance to the FIG. 7 inactive position, the stepped interfitting relationship between the slips and body sections enables the slips to move radially outwardly far enough to allow movement of the entire assembly upwardly past the upper end of the casing.
- Each of the slips 41 is suspended by an individual hanger 49 (FIGS. 5, 7, 8, and 13), which as seen best in FIG. 13 has a horizontal base portion 50 secured by screws 51 to the upper surface 42 of the slip.
- Two parallel vertical portions 52 of the bracket project upwardly in spaced relation, and may be interconnected by a cross web 53.
- the upstanding portions 52 of bracket 49 form a recess or guideway 54 de-- fined by two parallel planar inner surfaces 55 lying in planes which are parallel to and spaced equally in opposite directions from a vertical diametrical plane 56 containing the main vertical axis 12 of the tool.
- the two upstanding portions 52 preferably extend angularly radially outwardly as they advance upwardly above a location 57' near the level of cross web 53.
- each of these-posts57 is externally cylindrical and centered about a vertical axis 58 extending parallel to main vertical axis 12.
- the four axes 58 of the four posts 57 are equally spaced circularly about axis 12, with two of the posts being carried by body sec tion 20, and the other two posts being carried by body section 21, as seen best in FIG. 4.
- Each of the posts 57 is received telescopically within a coacting vertical cylindrical passage or guideway 59 in the corresponding body section, and is a sufficiently close fit in that passage to effectively guide the post for only vertical movement.
- a portion or all of the passage 59 may be lined by an appropriate bushing 60 to enhance the'effectiveness of the mounting of the post.
- a coil spring 61 is contained within the lower portion of each of the passages 59, and is seated at its lower end-on a reduced diameter shoulder portion 62 of passage 59, so that the spring yieldingly urges the associated post 57 upwardly from the FIG. 5 position toward a position just short of or under the FIG. 7 setting of the post.
- the force ofeach spring 60 is just sufficient to overcome the weight of the associated slip 41, bracket 59, and the bracket engaging structure carried at the upper end of the post.
- That bracket engaging structure at the upper end of each post includes a head element 63, which is' appropriately rigidly connected to the upper end of the associated post 57, as by providing head 63 with a vertical cylindrical passage 64 in which the upper end of the post is a tight forced or friction fit holding the parts in the illustrated assembled relation.
- this part may be of square cross section, up to the level 66 of FIG. 5, to have a planar vertical radially inner surface 67 and a parallel planar vertical radially outer surface 68, both of which are perpendicular to the previously mentioned radially extending'vertical plane 56.
- each of the heads 63 has a roller 70 mounted to turn relative to head 63 about a horizontal axis 71 (FIG. 5) which lies in the plane 56 of FIG. 5a.
- This A. roller 70 is received and closely confined within a vertical guideway 72 in an upstanding bifurcated guide element 73 projecting upwardly from a horizontal plate 74 secured rigidly to the upper surface 75 of the corresponding one of the two body sections m 21.
- the vertical guideway 72 thus guides roller 70 for only vertical movement, and thereby prevents post 57 from turning about its axis 58 upon upward movement of the post and carried structure.
- each of the post carried head elements 63 has a generally radially inwardly projecting arm 76, having parallel planar opposite side faces 77 which lie in two vertical planes parallel to the plane 56 of FIG. 13 and spaced very slightly from surfaces 55 of bracket 49, to allow movement of bracket 49 radially inwardly and outwardly relative to main axis 12 and relative to the post carried head element 63.
- the spaced upperportions 52' of the bracket 49 carry at their inner sides two pairs of guide rollers 78, with one of the pairs being carried by each of the projections 52 and with these rollers turning about two axes 79 and 80 as seen in FIGS.
- rollers are received and confined within two parallel coacting track guideways 81 formed in the opposite sides of arm 76 of head element 63, to hold each bracket 49 and carried slip 41 in a fixed orientation with respect to the corresponding post 57 while guiding the bracket and slip for its generally radial movement.
- the tracks 81 are inclined slightly, and the axes 79 and of the rollers 78 are correspondingly offset vertically as well as horizontally, to guide the brackets and slips for movement along slightly inclined paths which advance downwardly as the slips move radially outwardly.
- the weight of the slips will by gravity cause the slips and their brackets 49 to move radially outwardly to their laterally retracted positions of FIG.' 7.
- The'two cam sections 83 and 84 are actuable in unison between their discussed different settings of FIGS. 4 and 6 by means of two power actuated units, preferably taking the form of two piston and cylinder mechanisms 89 carried by the two body sections 20 and 21 respectively. More particularly, the cylinder of each of the mechanisms 89 may be secured pivotally at 90 to a portion of the previously mentioned plate 74 carried by one of the body sections, whilethe piston rod of that mechanism 89 may be secured pivotally at 91 to a portion of the associated cam section 83 or 84.
- An appropriate control valve diagrammatically represented at 92 in FIG. 4 supplies pressurized fluid to the two piston and cylinder mechanisms 89 simultaneously to actuate them at the same time in either desired direction.
- each of the plates 74 may carry several circularly spaced rollers 93 (FIG. 11) at the underside of the associated cam section 83 or 84, received and confined within an arcuate bottom recess or guideway 94 in that cam section, and may also carry a second group of circularly spaced rollers 95 for engaging an arcuate guide surface 96 formed at the upper side of-a flange 97 on the corresponding cam section 83 or 84.
- rollers 93 turn about horizontal axes 98 which extend radially outwardly from the main vertical axis 12 of the, tool, while rollers 95 turn about vertical axes 99, and have inclined annular frustoconical bearing surfaces 100 engaging the correspondingly inclined surfaces 96 on the cam sections.
- the cam sections are provided with four camming slots or guideways 101 (FIGS. 5, 7, 9, and 10), which receive four cam follower rollers 102 mounted rotatably to the four head elements 63 carried by the four posts 57 respectively.
- Each of these rollers 102 may turn about the corresponding radial axis 56 of FIG. 5a, and project radially inwardly from the inner surface 67 of the corresponding head 63.
- each c'am slot 101 has a camming surface'103 defining the upper side or edge of the slot and which is inclined to advance vertically as it advances arcuately about axis 12, upon arcuate movement of cams 83 and 84 from the FIG. 10 position to the FIG. 9 position, each roller 102 engages the corresponding cam surface 103 and is'deflected downwardly thereby, against the resistance offered by the associated spring 61, to thus cause downward shifting move-ment of the slips in response to predetermined arcuate movement of the cam sections.
- a camming surface'103 defining the upper side or edge of the slot and which is inclined to advance vertically as it advances arcuately about axis 12, upon arcuate movement of cams 83 and 84 from the FIG. 10 position to the FIG. 9 position, each roller 102 engages the corresponding cam surface 103 and is'deflected downwardly thereby, against the resistance offered by the associated spring 61, to thus cause downward shifting move-ment of the slips in response to predetermined ar
- surface 103 has two portions of different inclination, including a first portion of relatively great inclination from point 203 to point 303, and a second and preferably shorter portion of reduced inclination from point 303 to the extremity 403 of the'slot.
- the slips are first cammed downwardly at a relatively rapid rate, with resultant rapid radially inward movement of the. slips, and are then cammed very slowly downwardly and inwardly as the follower moves along the reduced inclination surface to the final pipe gripping position of FIG. 9.
- the initial rapid movement allows for positive forced centering of the pipe by the slips, even though the pipe may initially be offset a substantial distance from a properly centered position of alignment with the well axis, while the final slow movement permits a more gradual but still positive and forced ultimate setting of the slips into gripping contact with the pipe.
- each cam follower 102 is received within a shallow detenting notch 105 formed in an upwardly facing horizontal surface 106 which merges with the inclined bottom edge wall 206 of the corresponding slot 101.
- springs 60 urge the slips and cam followers 102 upwardly only to approximately the level of the follower 102 in FIG. 10, so that the weight of the slips and associated parts can maintain the followers 102 in detenting positions within notches 105.
- the body sections may carry two complementary essentially semicircular covers 107, secured by bolts 108 to the top of the body sections, and meeting in the previously mentioned plane of separation 22.
- the inner edges of these covers may carry two semicircular complementary flange elements defining together an opening dimensioned to receive the well casing 11, and to pass its upper enlarged tool joint end.
- the casing When the slips have thus been engaged with the-casing 11, the casing can be moved upwardly or downwardly as desired to add or subtract a length of pipe by actuation of the suspending hoist mechanism 14.
- the cam follower rollers In the FIG. 9 position of the cam mechanism, in which the slips are set tightly against the casing, the cam follower rollers are not normally at the end of their range of possible movement beyond points 303, but rather have remaining and unused space for overtraveling movement beyond that set position, in order to allow for effective gripping of pipes of different external diameters.
- the operator actuates the control valve to move the cam sections arcuately back to the setting of FIGS. 6, 7, and 10, to return the posts and carried parts back upwardly to the FIG. 7 position, with resultant automatic radially outward retraction of the slips by gravity as the hanger-rollers 78 move outwardly along the inclined guideway tracks 81.
- Engagement of the cam followers 102 with inclined surfaces 206 of the slots cams the followers and slips upwardly in a positive manner during such slipreleasing actuation.
- the slips are actuated to their retracted positions, the two pins 33 and one of the pins 25 are removed as previously described, and the entire assembly may then be swung open to the broken line position of FIG. 3.
- a well pipe supporting unit comprising a body structure to extend about a pipe, a plurality of slips movable upwardly and downwardly relative to said body structure between lower active pipe gripping positions and upper retracted positions, inclined surfaces for deflecting said slips inwardly against a pipe upon downward movement of the slips, an actuating structure extending generally arcuately about the axis of said pipe and' mounted to turn about said axis relative to said body structure and said slips, a plurality of generally vertical slip carrier posts mounted to said body structure at circularly spaced locations for longitudinal upward and downward movement relative to the body structure along individual axes, coacting cam means on said posts and said actuating structure operable to cam the posts upwardly and downwardly in response to turning movement of the actuating structure about said pipe axis, and a plurality of connections suspending upper portions of said slips from said different posts respectively for upward and downward movement therewith and for radially outward and inward movement relative to said-posts upon said upward and downward movements respectively.
- connections include inclined track means carried by said posts, and hangers projecting upwardly from and suspending said slips and engaging and suspended by and movable along said track means.
- said body structure includes a plurality of complementary body sections relatively movable to an open condition enabling movement of the body structure from about the pipe, said actuating structure being essentially annular and including a plurality of complementary essentially arcuate sections carried by said body sections respectively for relative opening movement therewith, there being a plurality of powered mechanisms carried by said body sections respectively for moving said sections of the actuating structure arcuately relative thereto.
- cam means include a plurality of inclined cam surfaces and engaging followers, said cam surfaces having first portions of relatively abrupt inclination acting upon initial arcuate movement said actuating structure to cause movement of the slips downwardly and inwardly at a relatively rapid rate, and said cam surfaces having second portions of less abrupt inclination acting to then automatically convert to a slower rate of downward and inward. movement of the slips upon further downward movement of the actuating structure.
- said actuating structure extends essentially arcuately about the axis of said pipe and has said camming surface formed thereon, said cam follower being connected to said one of the slips for movement therewith.
Abstract
Description
Claims (16)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18609671A | 1971-10-04 | 1971-10-04 |
Publications (1)
Publication Number | Publication Date |
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US3742562A true US3742562A (en) | 1973-07-03 |
Family
ID=22683645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00186096A Expired - Lifetime US3742562A (en) | 1971-10-04 | 1971-10-04 | Well pipe supporting unit |
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Country | Link |
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US (1) | US3742562A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2905214A1 (en) * | 1978-02-13 | 1979-08-16 | Varco Int | CATCHING WEDGE ARRANGEMENT |
US4203182A (en) * | 1978-02-13 | 1980-05-20 | Varco International, Inc. | Slip assembly |
US4253219A (en) * | 1979-02-14 | 1981-03-03 | Varco International, Inc. | Well slip assembly |
DE3030174A1 (en) * | 1979-12-07 | 1981-06-11 | Varco International Inc., Orange, Calif. | INTERCEPTIONAL WEDGE ARRANGEMENT |
US4715456A (en) * | 1986-02-24 | 1987-12-29 | Bowen Tools, Inc. | Slips for well pipe |
US4844489A (en) * | 1987-10-23 | 1989-07-04 | Acker Drill Co. | Chuck apparatus and method |
GB2292179A (en) * | 1994-08-12 | 1996-02-14 | Downhole Products Uk Ltd | A gripping device |
US5860760A (en) * | 1994-08-12 | 1999-01-19 | Downhole Products Plc | Gripping device |
US6494298B1 (en) * | 2000-05-17 | 2002-12-17 | Inventio Ag | High efficiency shoes for a jack arrester |
US6637526B2 (en) | 1999-03-05 | 2003-10-28 | Varco I/P, Inc. | Offset elevator for a pipe running tool and a method of using a pipe running tool |
US20100059231A1 (en) * | 2008-09-10 | 2010-03-11 | Benson Thomas | Methods and apparatus for supporting tubulars |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1909601A (en) * | 1927-03-29 | 1933-05-16 | Nat Supply Co | Mechanically operated slip type elevator |
US2126933A (en) * | 1935-08-12 | 1938-08-16 | Hydril Co | Well drilling equipment |
US2641816A (en) * | 1946-10-21 | 1953-06-16 | Mission Mfg Co | Power operated slip |
US2810552A (en) * | 1952-01-14 | 1957-10-22 | Nat Supply Co | Slip operating mechanism for rotary machines |
US3029488A (en) * | 1959-05-20 | 1962-04-17 | Dowty Rotol Ltd | Earth boring equipment |
US3230389A (en) * | 1962-05-23 | 1966-01-18 | Westinghouse Air Brake Co | Transistorized current transfer apparatus |
-
1971
- 1971-10-04 US US00186096A patent/US3742562A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1909601A (en) * | 1927-03-29 | 1933-05-16 | Nat Supply Co | Mechanically operated slip type elevator |
US2126933A (en) * | 1935-08-12 | 1938-08-16 | Hydril Co | Well drilling equipment |
US2641816A (en) * | 1946-10-21 | 1953-06-16 | Mission Mfg Co | Power operated slip |
US2810552A (en) * | 1952-01-14 | 1957-10-22 | Nat Supply Co | Slip operating mechanism for rotary machines |
US3029488A (en) * | 1959-05-20 | 1962-04-17 | Dowty Rotol Ltd | Earth boring equipment |
US3230389A (en) * | 1962-05-23 | 1966-01-18 | Westinghouse Air Brake Co | Transistorized current transfer apparatus |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2905214A1 (en) * | 1978-02-13 | 1979-08-16 | Varco Int | CATCHING WEDGE ARRANGEMENT |
US4203182A (en) * | 1978-02-13 | 1980-05-20 | Varco International, Inc. | Slip assembly |
US4253219A (en) * | 1979-02-14 | 1981-03-03 | Varco International, Inc. | Well slip assembly |
DE3030174A1 (en) * | 1979-12-07 | 1981-06-11 | Varco International Inc., Orange, Calif. | INTERCEPTIONAL WEDGE ARRANGEMENT |
US4715456A (en) * | 1986-02-24 | 1987-12-29 | Bowen Tools, Inc. | Slips for well pipe |
US4844489A (en) * | 1987-10-23 | 1989-07-04 | Acker Drill Co. | Chuck apparatus and method |
GB2292179A (en) * | 1994-08-12 | 1996-02-14 | Downhole Products Uk Ltd | A gripping device |
GB2292179B (en) * | 1994-08-12 | 1997-10-22 | Downhole Products Uk Ltd | A gripping device |
US5860760A (en) * | 1994-08-12 | 1999-01-19 | Downhole Products Plc | Gripping device |
US6637526B2 (en) | 1999-03-05 | 2003-10-28 | Varco I/P, Inc. | Offset elevator for a pipe running tool and a method of using a pipe running tool |
US6494298B1 (en) * | 2000-05-17 | 2002-12-17 | Inventio Ag | High efficiency shoes for a jack arrester |
US20100059231A1 (en) * | 2008-09-10 | 2010-03-11 | Benson Thomas | Methods and apparatus for supporting tubulars |
EP2163722A1 (en) * | 2008-09-10 | 2010-03-17 | Weatherford Lamb, Inc. | Method and apparatus for supporting tubulars |
AU2009212960B2 (en) * | 2008-09-10 | 2011-03-31 | Weatherford Technology Holdings, Llc | Methods and apparatus for supporting tubulars |
US7926577B2 (en) | 2008-09-10 | 2011-04-19 | Weatherford/Lamb, Inc. | Methods and apparatus for supporting tubulars |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TICOR TITLE INSURANCE COMPANY OF CALIFORNIA, A CA. Free format text: SECURITY INTEREST;ASSIGNOR:VARCO INTERNATIONAL, INC., A CA. CORP.;REEL/FRAME:004666/0813 Effective date: 19861014 Owner name: TICOR TITLE INSURANCE COMPANY OF CALIFORNIA, 333 S Free format text: SECURITY INTEREST;ASSIGNOR:VARCO INTERNATIONAL, INC., A CA. CORP.;REEL/FRAME:004666/0813 Effective date: 19861014 |
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AS | Assignment |
Owner name: VARCO INTERNATIONAL, INC., A CA. CORP.,CALIFORNI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TICOR TITLE INSURANCE COMPANY OF CALIFORNIA, A CA. CORP.;REEL/FRAME:004702/0972 Effective date: 19870317 Owner name: VARCO INTERNATIONAL, INC., 800 NORTH ECKHOFF STREE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TICOR TITLE INSURANCE COMPANY OF CALIFORNIA, A CA. CORP.;REEL/FRAME:004702/0972 Effective date: 19870317 |