US1894519A - Drill pipe protector - Google Patents

Drill pipe protector Download PDF

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US1894519A
US1894519A US447911A US44791130A US1894519A US 1894519 A US1894519 A US 1894519A US 447911 A US447911 A US 447911A US 44791130 A US44791130 A US 44791130A US 1894519 A US1894519 A US 1894519A
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Prior art keywords
wear
shaft
wear members
members
flanges
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US447911A
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William L Mclaine
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E M SMITH Co
RICHARD A SPERRY
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E M SMITH Co
RICHARD A SPERRY
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1042Elastomer protector or centering means
    • E21B17/105Elastomer protector or centering means split type

Definitions

  • My invention comprehends a simple form of devicevvhich may be secured to the drill shaft adjacent to the couplings and tool joints thereof, which device is formed principally of a resilient wear-resisting material and projects outwardly to such an extent that engagement of the couplings and tool joints of the drill shaft with the casing or open wall ofthe Well is prevented.
  • the drill pipe protector includes a plurality of wear members having projecting engagement portions formedof a resilient material, such as a rubber compound. especially adapted for relatively non-frictional engagement with the well casing or open wall of the well.
  • the engagement portions of the wear members project outwardly beyond the circumference ofthe couplings and tool jointsby which the pipes of the drill shaft are secured together and therefore prevent Wear on the drill shaft and reduce to a minimum the wear on the well casinor resulting from the operation ofl the drill shaft therein.
  • a further object of the invention is to provide a wear preventer having longitudinal circulation spaces or channels therein of ample size t-o permit a non-restricted flow of drilling mud upwardly around the drill shaft.
  • the replaceable Wear members are made of longitudinal form and are held in be forced inwardly against the surface of the drill shaft so as to securely hold the wear members in place.
  • Figure 1 is a fragmentary elevational section illustrating the manner in which my invention is. employed on a drill shaft within a Well.
  • Fig. 2 is an enlarged elevational view showing a preferred form of the invention mounted on a fragment of a drill shaft
  • Fig. 3 is a cross section'on a plane represented by the line 3-3 of Fig. 2.
  • y Fig. 4 is a perspective elevation of a wear member forming part of theinvention.
  • Fig. 1 shown a. portion of a casing 11 extending vertically within a well V12 which has been drilled by use of a drill bit 13 and other cooperating drilling tools.
  • the drillbit 13 is secured by means of a drill stem 14 to the lower end of a string of drill pipe or #ill shaft 15 consisting of lengths of dri pipe 16 secured together by means of sleeve couplings 17' ⁇ and tool joints V18.
  • 1t is impossible to operate a drill shaft, such as the drill shaft 15, concentrically within a well of any considerable depth. ln order tov prevent engagement of the.
  • protectors 20 of my invention are placed on the drill shaft l5 at suitable intervals, it being customary to place these protectors 20 adjacent to the couplingscompound, such body having an outer wearV receiving portion 23 of vertically elongated form and with rounded ends 24, as clearly shown in Figs. 2 and 4.
  • the members 22 also each have an inner or shaft engaging portion 25 which includes a laterally projecting flange .26, such flange 26 consisting of relatively narrow side portions 27 and end portions 28 which are preferably chamfered,
  • the inner face of the flange 26 is referably continuous with the inner face ,o the complete wear member 22 of which the flange 26 forms a part. rality of these wear members 22 are spaced around the exterior of the drill shaft 15 and are securely held against displacement by securing means 32 adapted to engage the outer faces 33 of thel flanges 26 and by inward pressure to compress the flanges 26 tightly against the shaft 15.
  • the simple form of securing means 32 shown in the drawing includes a pluralityl of arcuated plates 34 joined together by hinges 35 and each having an opening 36 therein of such size and configuration that an outer or wear receiving portion ofa wear member 22 may project therethrough.
  • the securing means 32 constitutes a cylindrical frame of ⁇ contractile character, and a simple device 37 is provided for circumferentially constricting this ,securing means or frame 32 around the flanges.,26 of the plurality of wear members 22.
  • the device 37 consists of a plurality of interengaging or dovetailing flat loops 40 and 41 formed on the longitudinal edges of the extreme plate members 43 and 44 of the assembly of plate members forming the se- A pluascesi@ and 44 whereby to produce a reduction in the I eective circumference of the securing means 32, which will result in clamping the flanges 26 of the wear members 22 tig itly against the shaft 15.
  • rlhe securing means 32 holds the wearl members 22 in such spaced relationship that circulation channels 50 exists between the opposing edges of the flanges 26, these channels 50 extending between the inner faces of the plate members 34 and the outer face of the shaft 15 and cooperate with the external vertical circulation channels formed by the circumferential spaces 52 existing between the outer or wear receiving portions of the wear members 22, thus giving ample space through whichthe upwardly moving drilling in ud may pass as it flows toward the mouth of the well or well casing.
  • the wear members 22 may be readily and economically replaced when they become worn and inay be made with the flanges 26 thereof arcuated, in the manner shown in the drawing, or flat, if desired, it being evide nt that when the securing means 32 is applied to an assembly of wear members 22, the
  • flanges 26 will be curved to arcuate form corresponding to the surface of the shaft 15.
  • a protector of the character described including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members having a shaft engaging portion for engaging said shaft and an outwardly projecting wear receiving portion; and means for clamping said lwear members inwardly against said shaft'with longitudinal spaces between the shaft engaging portions thereof to permit circulation of fluid longitudinally of said shaft.
  • a protector of the character described including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members having a shaft engaging portion for engaging said shaft and an outwardly projecting wear receiving portion; and a clamp of cylindrical form engaging external faces of said wear members for securing said wear members in spaced relationship on said shaft member and -with longitudinal spaces between the shaft engaging portions thereof to permit circulation of fluid longitudinally of said shaft.
  • a protector of the character described including: a lplurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members having a shaft engaging portion for engaging said shaft and an outwardly projecting wear receiving portion, said shaft engagin portions including laterally projecting anges extending laterally outward on four sides and being of less radial thickness than said,
  • clamp having an external circumference less than the circumference defined by the outer faces of said wear receiving portions of said Wear members and being adapted to engage4 said walls of said shaft engaging portions, the inner face of said clamp being spaced from the surface of said shaft member.
  • LA protector of the character described ⁇ 7 including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members consisting of a longitudinally elongated body of wear resisting material having a laterally projecting Harige at the inner portion thereof; and means for securing said wear mem- ⁇ bers, on said shaft member.
  • said means consisting of a cylindrical frame having a plurality of circumferentially spaced openings of a size to permit passage of the outer portions of said wear members, said frame engaging the outer faces of said flanges of said wear members and compressing said flanges against said shaft member.
  • a protector of the character described including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members consisting of a longitudinally elongated body of Wear resisting material having a laterally projecting Harige at the inner portion thereof; means for securing said wear members on said shaft member, said means consisting of a cylindrical frame having a plurality of circumferentially spaced openings of a size to permit passage'of the outer portions of said Wear members, said frame engaging the outer faces of said flanges of said wear members and compressing said flanges against said shaft member; and means for reducing the circumferential length of said frame whereby to constrict said frame around saidflanges of said wear members.
  • a protector ofthe character described including a plurality of Wear members adapted for placement on the, exterior of a shaft member, each of said wear members consisting of a longitudinally elongated body of wea-r resisting material ha/ving a laterally 'projecting flange at. the inner portion thereof: and means/for securing said wear members on said shaft member, said means consisting of a plurality of arcuated plates hinged one to the other and having openings therein through which the outer portions of said Wear members may project, said plates bearing against the outer faces of said flanges of said wear members and compressing said flanges against said shaft member.
  • a protector of the character described including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said Wear members consisting of a longitudinally elongated body of wear resisting material having a laterally project-ing iange at the inner portion thereof: means for securing said wear members on said shaft member, said means consisting of a plurality of arcuated plates hinged one to the other ⁇ and having openings therein through which the outer portions of said wear members may project, said plates bearing against the outer faces of said flanges of said Wear members and compressing said flanges against said shaft member; and locking means operated between the extreme plates of said securing means to circumferentially constrict said .securing means so as to clamp said flanges of said wear members against said shaft member.
  • a protector of the character described. including: a4 plurality of wear members adapted for placement-.on the exterior of a shaft member. each of said ⁇ wear members consisting of Aa longitudinally elongated body imV lli
  • said frame engaging the outer faces of said flanges of said wear members and compressing said fl'anges against said shaft mem-Y ber.
  • each of said Wear members consisting of a longitudinally elongated body of wear resisting material having a laterally projecting flange .at the inner portion thereof; and means for securing said wear members on said shaft member in such circumfcrentially spaced relationshipjthat longitudinal circulation channelswill exist between the edges of said flanges of said wear members, said means consisting of a plurality of ar'cuated plates hinged one to the other and having openings therein through which the outer portions of said wear members may project, said plates bearing against the outer faces of said flanges of said wear members and compressing said flanges against said shaft member.
  • each of said wear members consisting of a. longitudinally elongated body of Wear resisting material having -a laterthereof; means for securing said wear members on said shaft member in such circumferentially spaced relationship that longitudinal circulation channels will exist between the edges of said flanges of said wear members, said means consisting of'a plurality of arcuatcd plates hinged one to the other and havingl openings therein through which the outer portions of said wear members may project, said plates bearing against the outer faces of said flanges of said wear members and compressing said flanges against said shaft member; and locking means operated between the cumferentially constrictsaid securing means .so as to clamp said flanges of said wear members against said shaft member.
  • resisting material having a laterally projecting flange at the inner portion thereof which extends laterally outward in four directions and. adapted-to be compressed against the surface of a shaft member.
  • a wear member for a protector of the character described comprising an elongated body of lresilient Wear resisting material having a latsilient wear resisting material having a lat- 11.
  • a drill pipe protector the combination of: a plurality of wear members adapted for placementmn a drill pipe; separate means adaptedto engage said wear members p for clamping same to said drill pipe; and holding means cooperating betweensaid wear members and said separate meansfor holding said wear members in spaced relation l around said drill pipe.
  • a drill pipe protector the combination of: a plurality of wear members adapted for placement on a drill pipe; separate means adapted to engage said wear members -for clamping same to said drill pipe.,l said separate means including band means adapted to engage external surfaces of said wear members and constricting means for said band'ineans; and holding means for holding said wear members in predetermined positions on said drill pipe.

Description

' Jan.. 17, 1933. w. L, MLAINE' DRILL PIPE PROTECTOR Filed 'April 28, 1950 M ""lur mmh Qlllll Egg Imaam/Taza' Patented Jan. 17, 1933 UNITED-STATES PATENr orrlcla'.v
WILLIAM L. HCLAINE, OE LOS ANGELES. CALIFORNIA, ASSIGNOR OIF` ONE-THIRD TO RICHARD A. SPEBRY, .OF LOS ANGELES, CALIFORNIA, AND ONE-TBmD TO E. I. SMITH COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA DRILL PIPE Application filed April Q8,
the lower end of this drill shaft a drilling tool is secured. During the rotation of the drill shaft Within the Well, deflection occurs which brings portions of the drill shaft intoVf engagement with the casing of the well or with the open wall of the Well.- with the re' sult that the collars and tool vjoints of the drill shaft become rapidly worn so as to make replacement thereof frequently necessary, and in many instances the jvear on the casing is such that holes are formed thereinJ through which water may leak into the com- Ypleted well. these holes being hard to locate and difcult to cement-0E.
My invention comprehends a simple form of devicevvhich may be secured to the drill shaft adjacent to the couplings and tool joints thereof, which device is formed principally of a resilient wear-resisting material and projects outwardly to such an extent that engagement of the couplings and tool joints of the drill shaft with the casing or open wall ofthe Well is prevented. The drill pipe protector includes a plurality of wear members having projecting engagement portions formedof a resilient material, such as a rubber compound. especially adapted for relatively non-frictional engagement with the well casing or open wall of the well. The engagement portions of the wear members project outwardly beyond the circumference ofthe couplings and tool jointsby which the pipes of the drill shaft are secured together and therefore prevent Wear on the drill shaft and reduce to a minimum the wear on the well casinor resulting from the operation ofl the drill shaft therein.
It is'an object of the invention to make a Wearpreventer of extremely simple construction having the wear receiving parts thereof replaceable and having a simple device' PROTECTOR 1930. Serial No. 447,911.
for securing them in operative position on the drill shaft.
A further object of the invention is to provide a wear preventer having longitudinal circulation spaces or channels therein of ample size t-o permit a non-restricted flow of drilling mud upwardly around the drill shaft. Contributory to this feature of the invention, the replaceable Wear members are made of longitudinal form and are held in be forced inwardly against the surface of the drill shaft so as to securely hold the wear members in place. e
Further objects and advantages of the invention will be made evident throughout the following part of the specication.
Referring to the drawing whichis for il` lustrative purposes only, i
Figure 1 is a fragmentary elevational section illustrating the manner in which my invention is. employed on a drill shaft within a Well.
Fig. 2 is an enlarged elevational view showing a preferred form of the invention mounted on a fragment of a drill shaft Fig. 3 is a cross section'on a plane represented by the line 3-3 of Fig. 2.
y Fig. 4 is a perspective elevation of a wear member forming part of theinvention.
For the purpose of illustrating the utility of the invention I have Fig. 1 shown a. portion of a casing 11 extending vertically within a well V12 which has been drilled by use of a drill bit 13 and other cooperating drilling tools. The drillbit 13 is secured by means of a drill stem 14 to the lower end of a string of drill pipe or #ill shaft 15 consisting of lengths of dri pipe 16 secured together by means of sleeve couplings 17'` and tool joints V18. 1t is impossible to operate a drill shaft, such as the drill shaft 15, concentrically within a well of any considerable depth. ln order tov prevent engagement of the. couplings 17 and tool joints 13 ofthe drill shaft with the casing 11 or the open wall of the well, protectors 20 of my invention are placed on the drill shaft l5 at suitable intervals, it being customary to place these protectors 20 adjacent to the couplingscompound, such body having an outer wearV receiving portion 23 of vertically elongated form and with rounded ends 24, as clearly shown in Figs. 2 and 4. The members 22 also each have an inner or shaft engaging portion 25 which includes a laterally projecting flange .26, such flange 26 consisting of relatively narrow side portions 27 and end portions 28 which are preferably chamfered,
, as indicated at 30. The inner face of the flange 26 is referably continuous with the inner face ,o the complete wear member 22 of which the flange 26 forms a part. rality of these wear members 22 are spaced around the exterior of the drill shaft 15 and are securely held against displacement by securing means 32 adapted to engage the outer faces 33 of thel flanges 26 and by inward pressure to compress the flanges 26 tightly against the shaft 15. The simple form of securing means 32 shown in the drawing includes a pluralityl of arcuated plates 34 joined together by hinges 35 and each having an opening 36 therein of such size and configuration that an outer or wear receiving portion ofa wear member 22 may project therethrough. The portions of the arcuated plates 34 surrounding the openings 36 bear against the outer faces 33 of the flanges 26 and compress these flanges forcibly inwardly against the shaft 15, thus securing the wear members 22 in properly spaced positions on the shaft 15. The securing means 32 constitutes a cylindrical frame of `contractile character, and a simple device 37 is provided for circumferentially constricting this ,securing means or frame 32 around the flanges.,26 of the plurality of wear members 22. The device 37 consists of a plurality of interengaging or dovetailing flat loops 40 and 41 formed on the longitudinal edges of the extreme plate members 43 and 44 of the assembly of plate members forming the se- A pluascesi@ and 44 whereby to produce a reduction in the I eective circumference of the securing means 32, which will result in clamping the flanges 26 of the wear members 22 tig itly against the shaft 15. rlhe securing means 32 holds the wearl members 22 in such spaced relationship that circulation channels 50 exists between the opposing edges of the flanges 26, these channels 50 extending between the inner faces of the plate members 34 and the outer face of the shaft 15 and cooperate with the external vertical circulation channels formed by the circumferential spaces 52 existing between the outer or wear receiving portions of the wear members 22, thus giving ample space through whichthe upwardly moving drilling in ud may pass as it flows toward the mouth of the well or well casing. The wear members 22 may be readily and economically replaced when they become worn and inay be made with the flanges 26 thereof arcuated, in the manner shown in the drawing, or flat, if desired, it being evide nt that when the securing means 32 is applied to an assembly of wear members 22, the
flanges 26 will be curved to arcuate form corresponding to the surface of the shaft 15.
I claim as my invention:
1. A protector of the character described, including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members having a shaft engaging portion for engaging said shaft and an outwardly projecting wear receiving portion; and means for clamping said lwear members inwardly against said shaft'with longitudinal spaces between the shaft engaging portions thereof to permit circulation of fluid longitudinally of said shaft.`
2. A protector of the character described, including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members having a shaft engaging portion for engaging said shaft and an outwardly projecting wear receiving portion; and a clamp of cylindrical form engaging external faces of said wear members for securing said wear members in spaced relationship on said shaft member and -with longitudinal spaces between the shaft engaging portions thereof to permit circulation of fluid longitudinally of said shaft.
3. A protector of the character described, including: a lplurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members having a shaft engaging portion for engaging said shaft and an outwardly projecting wear receiving portion, said shaft engagin portions including laterally projecting anges extending laterally outward on four sides and being of less radial thickness than said,
wear members; and means of smaller circumference than the circumference defined by the outer faces of said wear receiving portions for engaging said flanges so as to secure` said wear members on said shaft.
4. A protector of the character described,
including: a plurality of wear members spaces between the shaft engagin portions' thereof to permit circulation of uid longitudinally along said shaft member, said clamp having an external circumference less than the circumferencedetined by the outer faces of said wear receiving portions of said wear members and being adapted to engage said Walls of said shaft engaging portions.
5. A protector of the character described,
including: a plurality of Wear members adad for placement on the exterior of a shaft member, each of said wear members having a shaft engaging portion for engaging said sha-ftmember and an outwardly projecting wear receiving portion, said shaft engaglng portions including walls of less radial thicmess than said wear members; and a clamp of cylindrical form for securing Said `Wear members in spaced relationship on said shaft member and with longitudinal spaces between the shaft' engaging portions thereof v'topermit circulation of fluid longitudinally along said shaft member, said.-
clamp having an external circumference less than the circumference defined by the outer faces of said wear receiving portions of said Wear members and being adapted to engage4 said walls of said shaft engaging portions, the inner face of said clamp being spaced from the surface of said shaft member.
(LA protector of the character described`7 including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members consisting of a longitudinally elongated body of wear resisting material having a laterally projecting Harige at the inner portion thereof; and means for securing said wear mem-` bers, on said shaft member. said means consisting of a cylindrical frame having a plurality of circumferentially spaced openings of a size to permit passage of the outer portions of said wear members, said frame engaging the outer faces of said flanges of said wear members and compressing said flanges against said shaft member.
7. A protector of the character described, including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said wear members consisting of a longitudinally elongated body of Wear resisting material having a laterally projecting Harige at the inner portion thereof; means for securing said wear members on said shaft member, said means consisting of a cylindrical frame having a plurality of circumferentially spaced openings of a size to permit passage'of the outer portions of said Wear members, said frame engaging the outer faces of said flanges of said wear members and compressing said flanges against said shaft member; and means for reducing the circumferential length of said frame whereby to constrict said frame around saidflanges of said wear members.
8. A protector ofthe character described, including a plurality of Wear members adapted for placement on the, exterior of a shaft member, each of said wear members consisting of a longitudinally elongated body of wea-r resisting material ha/ving a laterally 'projecting flange at. the inner portion thereof: and means/for securing said wear members on said shaft member, said means consisting of a plurality of arcuated plates hinged one to the other and having openings therein through which the outer portions of said Wear members may project, said plates bearing against the outer faces of said flanges of said wear members and compressing said flanges against said shaft member.
9. A protector of the character described, including: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said Wear members consisting of a longitudinally elongated body of wear resisting material having a laterally project-ing iange at the inner portion thereof: means for securing said wear members on said shaft member, said means consisting of a plurality of arcuated plates hinged one to the other `and having openings therein through which the outer portions of said wear members may project, said plates bearing against the outer faces of said flanges of said Wear members and compressing said flanges against said shaft member; and locking means operated between the extreme plates of said securing means to circumferentially constrict said .securing means so as to clamp said flanges of said wear members against said shaft member.
l0. A protector of the character described. including: a4 plurality of wear members adapted for placement-.on the exterior of a shaft member. each of said` wear members consisting of Aa longitudinally elongated body imV lli
bers, said frame engaging the outer faces of said flanges of said wear members and compressing said fl'anges against said shaft mem-Y ber.
includfng: a plurality of wear members adapted for placement on the exterior of a shaft member, each of said Wear members consisting of a longitudinally elongated body of wear resisting material having a laterally projecting flange .at the inner portion thereof; and means for securing said wear members on said shaft member in such circumfcrentially spaced relationshipjthat longitudinal circulation channelswill exist between the edges of said flanges of said wear members, said means consisting of a plurality of ar'cuated plates hinged one to the other and having openings therein through which the outer portions of said wear members may project, said plates bearing against the outer faces of said flanges of said wear members and compressing said flanges against said shaft member.
' 12. A protector of the character described,
" including: a plurality ofI wear members adapted for placement on the exterior of a ally projecting flange at the inner portion' shaft member, each of said wear members consisting of a. longitudinally elongated body of Wear resisting material having -a laterthereof; means for securing said wear members on said shaft member in such circumferentially spaced relationship that longitudinal circulation channels will exist between the edges of said flanges of said wear members, said means consisting of'a plurality of arcuatcd plates hinged one to the other and havingl openings therein through which the outer portions of said wear members may project, said plates bearing against the outer faces of said flanges of said wear members and compressing said flanges against said shaft member; and locking means operated between the cumferentially constrictsaid securing means .so as to clamp said flanges of said wear members against said shaft member.
resisting material having a laterally projecting flange at the inner portion thereof which extends laterally outward in four directions and. adapted-to be compressed against the surface of a shaft member.
14. As an article of manufacture, a wear member for a protector of the character described, comprising an elongated body of lresilient Wear resisting material having a latsilient wear resisting material having a lat- 11. A protector of the character described,
erally projecting flange at the inner portion thereof which extends laterally outward in 'four directions and is adapted to be com- -pe. l e
17. In a drill pipe protector the combination of: a plurality of wear members adapted for placementmn a drill pipe; separate means adaptedto engage said wear members p for clamping same to said drill pipe; and holding means cooperating betweensaid wear members and said separate meansfor holding said wear members in spaced relation l around said drill pipe.
18. ln a drill pipe protector the combination of: a plurality of wear members adapted for placement on a drill pipe; separate means adapted to engage said wear members -for clamping same to said drill pipe.,l said separate means including band means adapted to engage external surfaces of said wear members and constricting means for said band'ineans; and holding means for holding said wear members in predetermined positions on said drill pipe.
ln testimony whereof, l have hereunto set my hand at Los Angeles, California, this 22d day of April, 1930.
e WILLIAM L. MCLAINE.
'extreme plates of said 'securing means to cir-
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594551A (en) * 1950-03-15 1952-04-29 Gist Fred Morgan Centralizer and method of attaching
US2640735A (en) * 1947-02-17 1953-06-02 Hughes Tool Co Stabilizer for drill collars and drill pipe
US2722462A (en) * 1952-03-20 1955-11-01 Norman K Tschirley Drill pipe protector
US2754160A (en) * 1956-07-10 Well apparatus
US3080926A (en) * 1961-04-06 1963-03-12 Weatherford Oil Tool Company I Casing centralizer with replaceable wings
US3268275A (en) * 1965-05-11 1966-08-23 William N Laghlin Drill string protector and system
FR2307213A1 (en) * 1975-04-11 1976-11-05 Grace W R Ltd PROTECTION FOR PIPING
US5542454A (en) * 1994-04-08 1996-08-06 Hydrill Company Free flow low energy pipe protector
WO2010109229A3 (en) * 2009-03-27 2010-11-25 Caledus Limited Casing centraliser

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2754160A (en) * 1956-07-10 Well apparatus
US2640735A (en) * 1947-02-17 1953-06-02 Hughes Tool Co Stabilizer for drill collars and drill pipe
US2594551A (en) * 1950-03-15 1952-04-29 Gist Fred Morgan Centralizer and method of attaching
US2722462A (en) * 1952-03-20 1955-11-01 Norman K Tschirley Drill pipe protector
US3080926A (en) * 1961-04-06 1963-03-12 Weatherford Oil Tool Company I Casing centralizer with replaceable wings
US3268275A (en) * 1965-05-11 1966-08-23 William N Laghlin Drill string protector and system
FR2307213A1 (en) * 1975-04-11 1976-11-05 Grace W R Ltd PROTECTION FOR PIPING
US5542454A (en) * 1994-04-08 1996-08-06 Hydrill Company Free flow low energy pipe protector
WO2010109229A3 (en) * 2009-03-27 2010-11-25 Caledus Limited Casing centraliser

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