US3697141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill pipe wear sleeve
Assignee: Smith International Inc
•
Filing: 1970-05-21
•
Granted: 1972-10-10
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Expires: 1990-05-21
Abstract
Abstract A metal drill pipe is provided with a metal wear sleeve and an elastomer insert between the wear sleeve and the pipe. The sleeve is mechanically interlocked to the insert, e.g., by a thread on the inside of the sleeve. The sleeve is made in sections welded together while clamped against the insert with sufficient force to press the thread into the insert. The insert is secured against axial motion on the pipe by cement. There is a mechanical interlock between the insert and the cement, e.g., serrations on the inner periphery of the insert, the cement being applied to the inner periphery of the insert before curing, or a thread formed on the outer periphery of the cement which is cured on the pipe before the insert is compressed thereagainst during application of the sleeve to the insert. The cement extends beyond the ends of the wear sleeve to protect the pipe against corrosion due to well fluid trapped around the pipe adjacent a sleeve end. The sleeve is provided with annular grooves therearound at each end; the grooves increase the flexibility of the sleeve and also serve as wear indicators.
Inventors
- 👤 William R Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:24
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
413 words
Drill pipe made of strong metal and of elongated tubular configuration and having tool joints at the ends thereof, said drill pipe having intermediate the ends of the pipe between the tool joints a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the portion of the pipe therewithin, a tubular insert of elastic material under compression between the sleeve and the drill pipe, said insert having an elastic modulus less than that of the metal of the pipe, said insert being held against axial movement relative to said pipe with cement, and mechanical interlock means distributed over axially extending area between the inner periphery of said sleeve and the outer periphery of said insert, said mechanical interlock means including indenting means on the inner periphery of the sleeve to indent the outer periphery of the insert, said insert having a less indented outer peripheral surface when in an unstressed state than when under compression and indented by said indenting means, the material of said insert being an elastomer and the outer periphery of said insert being smooth when unstressed, e.g., when said insert is relieved of the compression between said sleeve and said pipe, the inner periphery of the sleeve being unbonded to the outer periphery of the insert, said indenting means having a radial extent of 0.05 to 0.25 inches and a frequency of between four and 100 interruptions per inch in at least one direction and extending over at least 50 square inches, and mechanical interlock means between the surface at the inner periphery of said insert and the surface at the outer periphery of said cement, the last said mechanical interlock means including indenting means on at least one of said surfaces, the interface between said cement and said pipe being smooth compared to said surface including the last said indenting means, the last said indenting means having a radial extent of 0.05 to 0.25 inches and a frequency in at least one direction of between four and 100 interruptioNs per inch and extending over at least 50 square inches, and the said indenting means of the mechanical interlock means between said cement and said insert being preformed on the outer periphery of the cement to indent the inner periphery of the elastomeric insert, said insert having a less indented inner peripheral surface when in an unstressed state than when under compression and indented by said indenting means of said cement.
Claim 2
Dependent Claim
413 words
Drill pipe made of strong metal and of elongated tubular configuration and having tool joints at the ends thereof, said drill pipe having intermediate the ends of the pipe between the tool joints a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the portion of the pipe therewithin, a tubular insert of elastic material under compression between the sleeve and the drill pipe, said insert having an elastic modulus less than that of the metal of the pipe, said insert being held against axial movement relative to said pipe with cement, and mechanical interlock means distributed over axially extending area between the inner periphery of said sleeve and the outer periphery of said insert, said mechanical interlock means including indenting means on the inner periphery of the sleeve to indent the outer periphery of the insert, said insert having a less indented outer peripheral surface when in an unstressed state than when under compression and indented by said indenting means, the material of said insert being an elastomer and the outer periphery of said insert being smooth when unstressed, e.g., when said insert is relieved of the compression between said sleeve and said pipe, the inner periphery of the sleeve being unbonded to the outer periphery of the insert, said indenting means having a radial extent of 0.05 to 0.25 inches and a frequency of between four and 100 interruptions per inch in at least one direction and extending over at least 50 square inches, and mechanical interlock means between the surface at the inner periphery of said insert and the surface at the outer periphery of said cement, the last said mechanical interlock means including indenting means on at least one of said surfaces, the interface between said cement and said pipe being smooth compared to said surface including the last said indenting means, the last said indenting means having a radial extent of 0.05 to 0.25 inches and a frequency in at least one direction of between four and 100 interruptioNs per inch and extending over at least 50 square inches, and the said indenting means of the mechanical interlock means between said cement and said insert being preformed on the outer periphery of the cement to indent the inner periphery of the elastomeric insert, said insert having a less indented inner peripheral surface when in an unstressed state than when under compression and indented by said indenting means of said cement.
Claim 3
Dependent Claim
252 words
Drill pipe made of strong metal and of elongated tubular configuration and having tool joints at the ends thereof, said drill pipe having intermediate the ends of the pipe between the tool joints a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the portion of the pipe therewithin, a tubular insert of elastic material between the sleeve and the drill pipe, said insert having an elastic modulus less than that of the metal pipe, said insert being held against axial movement relative to said pipe by cement therebetween, and mechanical interlock means between the surface at the inner periphery of said insert and the surface at the outer periphery of said cement, said mechanical interlock means including indenting means on at least one of said surfaces, the interface between said cement and said pipe being smooth compared to said surface including said indenting means, said indenting means having a radial extent of 0.05 to 0.25 inches and frequency in at least one direction of between four and 100 interruptions per inch and extending over at least 50 square inches, the material of the insert being an elastomer and said indenting means being preformed in said cement at the outer periphery thereof to indent the inner periphery of the elastomeric insert, said insert being under compression against said groove means, said insert having a less indented inner peripheral surface when in an unstressed state than when under compression between said sleeve and said cement.
Claim 4
Dependent Claim
252 words
Drill pipe made of strong metal and of elongated tubular configuration and having tool joints at the ends thereof, said drill pipe having intermediate the ends of the pipe between the tool joints a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the portion of the pipe therewithin, a tubular insert of elastic material between the sleeve and the drill pipe, said insert having an elastic modulus less than that of the metal pipe, said insert being held against axial movement relative to said pipe by cement therebetween, and mechanical interlock means between the surface at the inner periphery of said insert and the surface at the outer periphery of said cement, said mechanical interlock means including indenting means on at least one of said surfaces, the interface between said cement and said pipe being smooth compared to said surface including said indenting means, said indenting means having a radial extent of 0.05 to 0.25 inches and frequency in at least one direction of between four and 100 interruptions per inch and extending over at least 50 square inches, the material of the insert being an elastomer and said indenting means being preformed in said cement at the outer periphery thereof to indent the inner periphery of the elastomeric insert, said insert being under compression against said groove means, said insert having a less indented inner peripheral surface when in an unstressed state than when under compression between said sleeve and said cement.
Claim 5
Dependent Claim
290 words
Drill pipe made of strong metal and of elongated tubular configuration, said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the pipe, a tubular insert of elastomeric material around the drill pipe inside the sleeve, said insert having an elastic modulus of less than 10 percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, indentations distributed over an axially extended area of the inner periphery of said elastomeric insert and distributed annularly about the insert axis, said indentations having a radial extent in the range of 0.05 to 0.25 inches and a frequency in at least one direction in the range of four to 400 interruptions per inch and extending over at least 50 square inches, tough elastic cement filling said indentations and in contact with and adhered to the outer periphery of said pipe, said cement and insert being under compression between said pipe and said wear sleeve, indenting means distributed over an axially extended area of the inner periphery of said wear sleeve and distributed annularly about the axis thereof, said indenting means having a radial extent in the range of 0.05 to 0.25 inches and a frequency in at least one direction in the range of four to 400 interruptions per inch and extending over at least 50 square inches, said indenting means functioning to form indentations in the outer periphery of said elastomeric insert by being pressed thereagainst, and stress formed indentations in the outer periphery of said insert which indentations do not exist absent the pressure of said indenting means against said outer periphery of the insert.
Claim 6
Dependent Claim
290 words
Drill pipe made of strong metal and of elongated tubular configuration, said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the pipe, a tubular insert of elastomeric material around the drill pipe inside the sleeve, said insert having an elastic modulus of less than 10 percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, indentations distributed over an axially extended area of the inner periphery of said elastomeric insert and distributed annularly about the insert axis, said indentations having a radial extent in the range of 0.05 to 0.25 inches and a frequency in at least one direction in the range of four to 400 interruptions per inch and extending over at least 50 square inches, tough elastic cement filling said indentations and in contact with and adhered to the outer periphery of said pipe, said cement and insert being under compression between said pipe and said wear sleeve, indenting means distributed over an axially extended area of the inner periphery of said wear sleeve and distributed annularly about the axis thereof, said indenting means having a radial extent in the range of 0.05 to 0.25 inches and a frequency in at least one direction in the range of four to 400 interruptions per inch and extending over at least 50 square inches, said indenting means functioning to form indentations in the outer periphery of said elastomeric insert by being pressed thereagainst, and stress formed indentations in the outer periphery of said insert which indentations do not exist absent the pressure of said indenting means against said outer periphery of the insert.
Claim 7
Dependent Claim
299 words
Drill pipe made of strong metal and of elongated tubular configuration, said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the pipe, a tubular insert of elastomeric material around the drill pipe inside the sleeve, said insert having an elastic modulus of less than ten percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, cement means securing said elastomer insert to said pipe, said insert being under compression between said cement means and said metal sleeve, indentations distributed over an axially extended area of the interface between the inner periphery of said elastomeric insert and said cement means and distributed annularly about the insert axis, said indentations having a radial extent in the range of 0.05 to 0.25 inches and a frequency in at least one direction in the range of four to 400 interruptions per inch and extending over at least 50 square inches, said indentations being in both said cement and said insert and being correlative, indenting means distributed over an axially extended area of the inner periphery of said wear sleeve and distributed annularly about the axis thereof, said indenting means having a radial extent in the range of 0.05 to 0.25 inches and a frequency in at least one direction in the range of four to 400 interruptions per inch and extending over at least 50 square inches, said indenting means functioning to form indentations in the outer periphery of said elastomeric insert by being pressed thereagainst, and stress formed indentations in the outer periphery of said insert which indentations do not exist absent the pressure of said indenting means against said outer periphery of the insert.
Claim 8
Dependent Claim
299 words
Drill pipe made of strong metal and of elongated tubular configuration, said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the pipe, a tubular insert of elastomeric material around the drill pipe inside the sleeve, said insert having an elastic modulus of less than ten percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, cement means securing said elastomer insert to said pipe, said insert being under compression between said cement means and said metal sleeve, indentations distributed over an axially extended area of the interface between the inner periphery of said elastomeric insert and said cement means and distributed annularly about the insert axis, said indentations having a radial extent in the range of 0.05 to 0.25 inches and a frequency in at least one direction in the range of four to 400 interruptions per inch and extending over at least 50 square inches, said indentations being in both said cement and said insert and being correlative, indenting means distributed over an axially extended area of the inner periphery of said wear sleeve and distributed annularly about the axis thereof, said indenting means having a radial extent in the range of 0.05 to 0.25 inches and a frequency in at least one direction in the range of four to 400 interruptions per inch and extending over at least 50 square inches, said indenting means functioning to form indentations in the outer periphery of said elastomeric insert by being pressed thereagainst, and stress formed indentations in the outer periphery of said insert which indentations do not exist absent the pressure of said indenting means against said outer periphery of the insert.
Claim 9
Dependent Claim
210 words
Drill pipe made of strong metal and of elongated tubular configuration. said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the pipe, a tubular insert of elastomeric material around the drill pipe inside the sleeve, said insert having an elastic modulus of less than ten percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, a layer of tough elastic polymer cement around the pipe inside said insert, mechanical interlock means distributed over axially extending area between the inner periphery of said sleeve and outer periphery of said insert comprising indenting means on the inner periphery of the sleeve to indent the outer periphery of the insert, and mechanical interlock means between the inner periphery of said insert and the outer periphery of said cement comprising interengaged indentations on the outer periphery of the cement and the inner periphery of the insert, said insert being under compression between said sleeve and cement sufficient to cause said indenting means to indent the surface of the insert adjacent to said indenting means beyond the degree of smoothness of said surface when said compression is relieved.
Claim 10
Dependent Claim
210 words
Drill pipe made of strong metal and of elongated tubular configuration. said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the pipe, a tubular insert of elastomeric material around the drill pipe inside the sleeve, said insert having an elastic modulus of less than ten percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, a layer of tough elastic polymer cement around the pipe inside said insert, mechanical interlock means distributed over axially extending area between the inner periphery of said sleeve and outer periphery of said insert comprising indenting means on the inner periphery of the sleeve to indent the outer periphery of the insert, and mechanical interlock means between the inner periphery of said insert and the outer periphery of said cement comprising interengaged indentations on the outer periphery of the cement and the inner periphery of the insert, said insert being under compression between said sleeve and cement sufficient to cause said indenting means to indent the surface of the insert adjacent to said indenting means beyond the degree of smoothness of said surface when said compression is relieved.
Claim 11
Dependent Claim
42 words
Drill pipe according to claim 5 wherein said sleeve extends axially beyond said insert at each end thereof to protect the insert, and said cement coats said pipe in the annulus between said sleeve and pipe beyond the ends of said insert.
Claim 12
Dependent Claim
29 words
Drill pipe according to claim 5 wherein said cement coats said pipe adjacent the ends of the sleeve beyond the ends of said sleeve out from inside the sleeve.
Claim 13
Dependent Claim
30 words
Drill pipe according to claim 5 wherein said insert extends axially beyond said sleeve at each end thereof to protect said pipe adjacent the ends of the sleeve against corrosion.
Claim 14
Dependent Claim
24 words
Drill pipe according to claim 8 wherein said cement coats said pipe adjacent the ends of said insert beyond the ends of said insert.
Claim 15
Dependent Claim
24 words
Drill pipe according to claim 5 wherein the lay of said mechanical interlock means is primarily transverse to the axis of said drill pipe.
Claim 16
Dependent Claim
41 words
Drill pipe according to claim 5 wherein said mechanical interlock means in part is of a lay primarily parallel to the axis oF the drill pipe and in part of a lay primarily transverse to the axis of the drill pipe.
Claim 17
Dependent Claim
24 words
Drill pipe according to claim 5 wherein the lay of said mechanical interlock means is primarily parallel to the axis of said drill pipe.
Claim 18
Dependent Claim
15 words
Drill pipe according to claim 12 wherein said mechanical interlock means includes a fluted surface.
Claim 19
Dependent Claim
28 words
Drill pipe according to claim 5 wherein the lay of said mechanical interlock means has substantial components both parallel and transverse to the axis of said drill pipe.
Claim 20
Dependent Claim
15 words
Drill pipe according to claim 14 wherein said mechanical interlock means includes a dimpled surface.
Claim 21
Dependent Claim
38 words
Drill pipe according to claim 5 wherein the first said mechanical interlock means includes a threaded surface that is axially grooved and the second said mechanical interlock means includes a surface that is serrated annularly and grooved axially.
Claim 22
Dependent Claim
40 words
Drill pipe according to claim 5 wherein said sleeve includes flexure groove means in said outer periphery thereof to decrease the rigidity of the sleeve and thereby reduce stress concentration in the pipe when the pipe bends inside the sleeve.
Claim 23
Dependent Claim
46 words
Drill pipe according to claim 5 wherein each of said indenting means has a radial extent of 0.05 to 0.25 inches and a frequency in at least one direction each of between four and 100 interruptions per inch and extends over at least 50 square inches.
Claim 24
Dependent Claim
34 words
Drill pipe according to claim 5 wherein said cement is an epoxy cement that is stable at temperatures of up to 350* F. and said insert is bonded to said pipe with said cement.
Claim 25
Dependent Claim
49 words
Drill pipe according to claim 5 wherein the outer periphery of said insert is smooth when unstressed, e.g., when said insert is relieved of the compression between said sleeve and said pipe, and wherein the inner periphery of the sleeve is unbonded to the outer periphery of the insert.
Claim 26
Dependent Claim
31 words
Drill pipe according to claim 5 wherein the indenting means of the mechanical interlock means between said insert and said cement is preformed on the inner periphery of the elastomeric insert.
Claim 27
Dependent Claim
278 words
Drill pipe made of strong metal and of elongated tubular configuration, said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the pipe, a tubular insert of elastomeric material under compression between the sleeve and the drill pipe, said insert having an elastic modulus of less than ten percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, said insert being held against axial movement relative to said pipe with cement, mechanical interlock means distributed over axially extending area between the inner periphery of said sleeve and outer periphery of said insert comprising indenting means on the inner periphery of the sleeve to indent the outer periphery of the insert, said insert having a less indented outer peripheral surface when in an unstressed state than when under compression and indented by said indenting means, mechanical interlock means between the surface at the inner periphery of said insert and the surface at the outer periphery of said cement, the last said mechanical interlock means including indenting means on at least one of said surfaces, the interface between said cement and said pipe being smooth compared to said surface including the last said indenting means, the indenting means of the mechanical interlock means between said cement and said insert being preformed on the outer periphery of the cement to indent the inner periphery of the elastomeric insert, said insert having a less indented inner peripheral surface when in an unstressed state than when under compression and indented by said indenting means of said cement.
Claim 28
Dependent Claim
278 words
Drill pipe made of strong metal and of elongated tubular configuration, said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameter larger than the outer diameter of the pipe, a tubular insert of elastomeric material under compression between the sleeve and the drill pipe, said insert having an elastic modulus of less than ten percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, said insert being held against axial movement relative to said pipe with cement, mechanical interlock means distributed over axially extending area between the inner periphery of said sleeve and outer periphery of said insert comprising indenting means on the inner periphery of the sleeve to indent the outer periphery of the insert, said insert having a less indented outer peripheral surface when in an unstressed state than when under compression and indented by said indenting means, mechanical interlock means between the surface at the inner periphery of said insert and the surface at the outer periphery of said cement, the last said mechanical interlock means including indenting means on at least one of said surfaces, the interface between said cement and said pipe being smooth compared to said surface including the last said indenting means, the indenting means of the mechanical interlock means between said cement and said insert being preformed on the outer periphery of the cement to indent the inner periphery of the elastomeric insert, said insert having a less indented inner peripheral surface when in an unstressed state than when under compression and indented by said indenting means of said cement.
Claim 29
Dependent Claim
213 words
Drill pipe made of strong metal and of elongated tubular configuration, said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameTer larger than the outer diameter of the pipe, a tubular insert of elastomeric material around the drill pipe inside the sleeve, said insert having an elastic modulus of less than 10 percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, a layer of tough elastic polymer cement around the pipe inside said insert, mechanical interlock means distributed over axially extending area between the inner periphery of said sleeve and outer periphery of said insert comprising indenting means on the inner periphery of the sleeve to indent the outer periphery of the insert, and mechanical interlock means between the inner periphery of said insert and the outer periphery of said cement comprising indenting means on the outer periphery of the cement to indent the inner periphery of the insert, said insert being under compression between said sleeve and cement sufficient to cause both of said indenting means to indent the surfaces of the insert adjacent to said indenting means beyond the degree of smoothness of said surfaces when said compression is relieved.
Claim 30
Dependent Claim
213 words
Drill pipe made of strong metal and of elongated tubular configuration, said drill pipe having intermediate the ends of the pipe a wear sleeve made of strong metal and having an inner diameTer larger than the outer diameter of the pipe, a tubular insert of elastomeric material around the drill pipe inside the sleeve, said insert having an elastic modulus of less than 10 percent of that of the metal of the pipe and a maximum elongation of at least 50 percent, a layer of tough elastic polymer cement around the pipe inside said insert, mechanical interlock means distributed over axially extending area between the inner periphery of said sleeve and outer periphery of said insert comprising indenting means on the inner periphery of the sleeve to indent the outer periphery of the insert, and mechanical interlock means between the inner periphery of said insert and the outer periphery of said cement comprising indenting means on the outer periphery of the cement to indent the inner periphery of the insert, said insert being under compression between said sleeve and cement sufficient to cause both of said indenting means to indent the surfaces of the insert adjacent to said indenting means beyond the degree of smoothness of said surfaces when said compression is relieved.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |