Patent US3578084A successfully refreshed from Google Patents.
US3578084A
Expired / Lapsed
US
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Thermal well completion method and apparatus
Assignee: ExxonMobil Upstream Research Co
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Filing: 1969-06-23
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Granted: 1971-05-11
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Expires: 1989-06-23
Abstract
Abstract A method and apparatus for attaching subsurface cementing devices to the periphery of free moving casing for use in thermal wells. Centralizers, wall scratchers, cement baskets, and the like are secured to the free-moving casing by means of a fusible material which is rigid at normal subsurface temperatures and which is deformable at thermal treatment temperatures.
Inventors
- 👤 Caurino C Bombardieri
- 👤 James F Tod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:52
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
148 words
Apparatus for attaching a subsurface cementing device to the outer periphery of a free-moving section of a piPe to be subjected to an elevated heat-treating temperature in a thermal well, said cementing device having at least one collar adapted to be slidably mounted around said pipe prior to introducing said pipe into the well, said apparatus comprising: a sleeve adapted to fit circumferentially around said pipe and composed of heatsensitive material rigid at normal subsurface temperatures and deformable at a temperature above said normal subsurface temperature but substantially below said elevated heat-treating temperature; and means for securing said sleeve to said pipe in engaging relation to said collar whereby said device and said pipe are maintained in fixed relation at normal subsurface temperatures and are relatively movable at temperatures equal to and greater than said temperature above said normal subsurface temperature but substantially below said elevated heat-treating temperature.
Claim 2
Dependent Claim
148 words
Apparatus for attaching a subsurface cementing device to the outer periphery of a free-moving section of a piPe to be subjected to an elevated heat-treating temperature in a thermal well, said cementing device having at least one collar adapted to be slidably mounted around said pipe prior to introducing said pipe into the well, said apparatus comprising: a sleeve adapted to fit circumferentially around said pipe and composed of heatsensitive material rigid at normal subsurface temperatures and deformable at a temperature above said normal subsurface temperature but substantially below said elevated heat-treating temperature; and means for securing said sleeve to said pipe in engaging relation to said collar whereby said device and said pipe are maintained in fixed relation at normal subsurface temperatures and are relatively movable at temperatures equal to and greater than said temperature above said normal subsurface temperature but substantially below said elevated heat-treating temperature.
Claim 3
Dependent Claim
16 words
The invention as recited in claim 1 wherein said sleeve is composed of a low-melting alloy.
Claim 4
Dependent Claim
25 words
The invention as recited in claim 2 wherein said alloy is a bismuth alloy fusible at temperatures from about 100* F. to about 300* F.
Claim 5
Dependent Claim
29 words
The invention as recited in claim 2 wherein said bismuth alloy contains seven to eight parts bismuth, four parts lead, two parts tin, and one to two parts cadmium.
Claim 6
Dependent Claim
15 words
The invention as recited in claim 1 wherein said heat-sensitive material is a thermoplastic resin.
Claim 7
Dependent Claim
40 words
The invention as recited in claim 1 wherein said sleeve is disposed intermediate said collar and said pipe, and said means for securing said sleeve includes clamping means mounted on said collar for applying a compressive force to said sleeve.
Claim 8
Dependent Claim
44 words
The invention as recited in claim 1 wherein said sleeve is mounted on said pipe in end-to-end abutting relation to said collar, and said means for securing said sleeve includes clamping means mounted on said sleeve for grippingly securing said sleeve about said pipe.
Claim 9
Dependent Claim
95 words
A centralizer for attachment to the outer periphery of pipe to be subjected to an elevated heat-treating temperature in a thermal well, said centralizer comprising: a pair of spaced collars particularly sized to fit about the periphery of said pipe at a longitudinally spaced interval, at least one of said collars being composed of heat-sensitive material rigid at normal subsurface temperatures and deformable at a temperature above said normal subsurface temperatures but substantially below said elevated heat-treating temperature; means for securing said one collar to said pipe; and outwardly bowed spring members interconnecting said collars.
Claim 10
Dependent Claim
95 words
A centralizer for attachment to the outer periphery of pipe to be subjected to an elevated heat-treating temperature in a thermal well, said centralizer comprising: a pair of spaced collars particularly sized to fit about the periphery of said pipe at a longitudinally spaced interval, at least one of said collars being composed of heat-sensitive material rigid at normal subsurface temperatures and deformable at a temperature above said normal subsurface temperatures but substantially below said elevated heat-treating temperature; means for securing said one collar to said pipe; and outwardly bowed spring members interconnecting said collars.
Claim 11
Dependent Claim
32 words
The invention as recited in claim 8 wherein said one collar is composed of a bismuth alloy having a melting temperature in the range from about 100* F. to about 300* F.
Claim 12
Dependent Claim
93 words
Apparatus for positioning devices on the outer periphery of pipe to be subjected to an elevated heat-treating temperature in a thermal well, said apparatus comprising: a collar sized to fit about the periphery of said pipe and adapted to clampingly engage a portion of said device maintaining said device in fixed relation on said pipe, said collar being composed of heat-sensitive material rigid at normal subsurface temperatures and deformable at a temperature above said normal subsurface temperature but substantially below said elevated heat-treating temperature; and means for securing said collar to said pipe.
Claim 13
Dependent Claim
93 words
Apparatus for positioning devices on the outer periphery of pipe to be subjected to an elevated heat-treating temperature in a thermal well, said apparatus comprising: a collar sized to fit about the periphery of said pipe and adapted to clampingly engage a portion of said device maintaining said device in fixed relation on said pipe, said collar being composed of heat-sensitive material rigid at normal subsurface temperatures and deformable at a temperature above said normal subsurface temperature but substantially below said elevated heat-treating temperature; and means for securing said collar to said pipe.
Claim 14
Independent Claim
90 words
A method for attaching a collared device to a free-moving section of pipe to be used in thermal wells, said method comprising the steps of: positioning said device on said pipe wherein said device collar is disposed circumferentially around said pipe; pouring a molten fusible material in the annulus separating said collar and said pipe, said material having a melting temperature above normal subsurface temperatures but substantially below the maximum heat-treating of the well temperature; and permitting said alloy to solidify whereby said device is firmly bonded to said pipe.
Claim 15
Independent Claim
90 words
A method for attaching a collared device to a free-moving section of pipe to be used in thermal wells, said method comprising the steps of: positioning said device on said pipe wherein said device collar is disposed circumferentially around said pipe; pouring a molten fusible material in the annulus separating said collar and said pipe, said material having a melting temperature above normal subsurface temperatures but substantially below the maximum heat-treating of the well temperature; and permitting said alloy to solidify whereby said device is firmly bonded to said pipe.
Claim 16
Dependent Claim
21 words
The inveNtion as recited in claim 11 wherein said alloy is a bismuth alloy having a melting temperature below 200* F.
Claim 17
Dependent Claim
30 words
The invention as recited in claim 12 wherein said alloy is composed of seven to eight parts bismuth, four parts lead, two parts tin, and one to two parts cadmium.
Claim 18
Independent Claim
114 words
A method of cementing pipe in a well bore comprising: placing said pipe in the well bore, said pipe having an upper section peripherally coated with a lubricating material, a lower section free of said lubricating material, and a cementing device bonded to said pipe in said upper section by heat-sensitive material rigid at normal subsurface temperatures in the well bore and having sufficient mechanical strength to maintain said device in fixed relation on said pipe at said normal subsurface temperatures; forming a cement sheath about said lower section and a portion of said upper section including said cementing device, and melting said heat-sensitive material permitting relative movement of said pipe and said device.
Claim 19
Independent Claim
114 words
A method of cementing pipe in a well bore comprising: placing said pipe in the well bore, said pipe having an upper section peripherally coated with a lubricating material, a lower section free of said lubricating material, and a cementing device bonded to said pipe in said upper section by heat-sensitive material rigid at normal subsurface temperatures in the well bore and having sufficient mechanical strength to maintain said device in fixed relation on said pipe at said normal subsurface temperatures; forming a cement sheath about said lower section and a portion of said upper section including said cementing device, and melting said heat-sensitive material permitting relative movement of said pipe and said device.
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |