US3882665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible pumping strand and method of making
Assignee: WILLIAMSPORT WIREROPE WORKS Inc A CORP OF PA
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Filing: 1974-02-19
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Granted: 1975-05-13
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Expires: 1994-02-19
Abstract
Abstract A flexible pumping strand is formed from a plurality of steel wires stranded or held together within an abrasion resistant flexible outer plastic jacket perforated at intervals along its length, each of the plurality of steel wires being coated with an imperforate corrosion resistant plastic bonded to the surface of the wire. A method of forming the flexible pumping strand and the perforations in the outer coating of the strand involving the use of steam induced perforation during extrusion of the plastic jacket over the strand is also disclosed.
Inventors
- 👤 Charles R Hughes
- 👤 James M Doll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/06; D07B1/0693; D07B1/16; D07B1/162; D07B7/00; D07B7/02; D07B7/14; D07B7/145; D07B2201/00; D07B2201/20; D07B2201/2001; D07B2201/201; D07B2201/2012; D07B2201/2015; D07B2201/2042; D07B2201/2044; D07B2201/2083; D07B2201/2084; D07B2205/00; D07B2205/20; D07B2205/2046
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
113 words
A flexible pumping strand comprising: a. a plurality of wires collected together into a linear member, b. a polymeric coating on the exterior of each of said wires, said polymer being substantially inert to an oil well fluid, substantially impermeable to the water and gaseous corrodants and being resistant to fretting and abrasion between said wires, c. said polymeric coating being closely bonded to the surface of said wires through a thin film of an intermediate primer, d. an outer plastic jacket coating the outside of said strand, e. said outer plastic jacket having perforations throughout its length such that free passage of an oil well fluid through the plastic jacket is assured.
Claim 2
Dependent Claim
113 words
A flexible pumping strand comprising: a. a plurality of wires collected together into a linear member, b. a polymeric coating on the exterior of each of said wires, said polymer being substantially inert to an oil well fluid, substantially impermeable to the water and gaseous corrodants and being resistant to fretting and abrasion between said wires, c. said polymeric coating being closely bonded to the surface of said wires through a thin film of an intermediate primer, d. an outer plastic jacket coating the outside of said strand, e. said outer plastic jacket having perforations throughout its length such that free passage of an oil well fluid through the plastic jacket is assured.
Claim 3
Dependent Claim
20 words
A flexible pumping strand according to claim 1 wherein the polymeric coating on the wires is comprised of a fluoropolymer.
Claim 4
Dependent Claim
17 words
A flexible pumping strand according to claim 2 wherein the flexible pumping strand is a helical strand.
Claim 5
Dependent Claim
31 words
A flexible pumping strand according to claim 3 wherein the flexible pumping strand has opposite rotations in different lays and the outside of the outer jacket has a smooth cylindrical surface.
Claim 6
Dependent Claim
39 words
A flexible pumping strand according to claim 3 wherein the polymeric coating on the wires is comprised essentially of a polymer selEcted from the group consisting of polyvinylidene fluoride, polychlorotrifluoroethylene, a copolymer of tetrafluoroethylene and hexafluoropropylene, polyethylenechlorotrifluoroethylene and polyethylenetetrafluoroethylene.
Claim 7
Dependent Claim
50 words
A flexible pumping strand according to claim 5 wherein the fluoropolymer is bonded to the surface of the underlying wire at least in part through an intermediate film of a fused coating of a polymer having a similar fluoropolymer composition applied initially in a dispersed condition in an organic solvent.
Claim 8
Dependent Claim
37 words
A flexible pumping strand according to claim 6 wherein the fluoropolymer is bonded to the surface of the underlying wire through an intermediate film comprised of two primary coats one of which is an epoxy base primer.
Claim 9
Dependent Claim
27 words
A flexible pumping strand according to claim 7 wherein the perforations in said outer plastic jacket are from one-eighth inch in diameter to one-half inch in diameter.
Claim 10
Dependent Claim
33 words
A flexible pumping strand according to claim 8 wherein the perforations in said outer strand jacket are spaced apart along the longitudinal extent of the strand at intervals no greater than 30 feet.
Claim 11
Dependent Claim
38 words
A flexible pumping strand according to claim 3 wherein the flexible pumping strand has opposite rotations in different layers of wires in the strand and the outside of the outer plastic jacket has a substantially smooth outer surface.
Claim 12
Dependent Claim
95 words
A flexible pumping strand comprising: a. a plurality of wires collected together to form an extended linear member, b. a polymeric coating on the exterior surface of said wires which is substantially inert to oil well fluid, substantially impermeable to water and corrosion inducing gases and resistant to fretting and abrasion between the wires, c. an outer abrasion resistant plastic jacket covering the outside of said strand, d. said outer abrasion resistant plastic jacket having perforations throughout its length such that the free passage of an oil well fluid through said plastic jacket is assured.
Claim 13
Dependent Claim
95 words
A flexible pumping strand comprising: a. a plurality of wires collected together to form an extended linear member, b. a polymeric coating on the exterior surface of said wires which is substantially inert to oil well fluid, substantially impermeable to water and corrosion inducing gases and resistant to fretting and abrasion between the wires, c. an outer abrasion resistant plastic jacket covering the outside of said strand, d. said outer abrasion resistant plastic jacket having perforations throughout its length such that the free passage of an oil well fluid through said plastic jacket is assured.
Claim 14
Dependent Claim
17 words
A flexible pumping strand according to claim 11 wherein said polymeric coating of (b) is a fluoropolymer.
Claim 15
Dependent Claim
16 words
A flexible pumping strand according to claim 12 wherein said fluoropolymer is comprised of polyvinylidene fluoride.
Claim 16
Dependent Claim
15 words
A flexible pumping strand according to claim 12 wherein said fluoropolymer is comprised of polychlorotrifluoroethylene.
Claim 17
Dependent Claim
20 words
A flexible pumping strand according to claim 12 wherein said fluoropolymer is comprised of a copolymer of tetrafluoroethylene and hexafluoropropylene.
Claim 18
Dependent Claim
15 words
A flexible pumping strand according to claim 12 wherein said fluoropolymer is comprised of polyethylenechlorotrifluoroethylene.
Claim 19
Dependent Claim
15 words
A flexible pumping strand according to claim 12 wherein said fluoropolymer is comprised of polyethylenetetrafluoroethylene.
Claim 20
Dependent Claim
24 words
A flexible pumping strand according to claim 12 wherein the fluoropolymer is tightly bonded to said wire surface by an intermediate film of polymer.
Claim 21
Dependent Claim
37 words
A flexible pumping strand according to claim 18 wherein the primer constitutes at least in part a fused film of a polymer similar in composition to the polymeric protective coating applied to the surface of the wire.
Claim 22
Dependent Claim
36 words
A flexible pumping strand according to claim 19 wherein the polymer is bonded to the surface of the wire through an intermediate film comprised of two primary coats one of which is an epoxy base primer.
Claim 23
Dependent Claim
49 words
A flexible pumping strand according to claim 20 wherein the perforations in said outer plastic jacket are from one-eighth inch in diameter to one-half inch in diameter and the said perforations are spaced apart on said longitudinal extent of said strand at intervals no greater than about thirty feet.
Claim 24
Independent Claim
87 words
A method of making flexible pumping strand comprising: a. coating a plurality of wires with a fluoropolymer, b. stranding said plurality of wires into a wire strand, c. contacting the wires of said strand with a vaporizable liquid, and d. pressure extruding an outer jacket of polymer about said strand under a pressure Such that the coatings on the wires are temporarily compressed during said extrusion step and the heat of the extrusion causes vaporization of said liquid and perforation of said soft jacket prior to hardening.
Claim 25
Independent Claim
87 words
A method of making flexible pumping strand comprising: a. coating a plurality of wires with a fluoropolymer, b. stranding said plurality of wires into a wire strand, c. contacting the wires of said strand with a vaporizable liquid, and d. pressure extruding an outer jacket of polymer about said strand under a pressure Such that the coatings on the wires are temporarily compressed during said extrusion step and the heat of the extrusion causes vaporization of said liquid and perforation of said soft jacket prior to hardening.
Claim 26
Dependent Claim
54 words
A method of making flexible pumping strand according to claim 22 additionally comprising initially applying a primer to the surfaces of the wires by contacting the surfaces of the wires with a dispersion of a polymer similar in composition to the fluoropolymer with which the wires are to be coated and fusing said polymer.
Claim 27
Dependent Claim
85 words
A method of making flexible pumping strand according to claim 23 where the primer is applied in a two step operation comprising initially contact the wire surface with a film of an epoxy base composition, heat curing the epoxy composition, applying a film of a dispersion in an organic solvent of a polymer having a composition similar to the composition of the protective fluoropolymer coating which is to be applied to the wire and fusing said film of polymer to the surface of the wire.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |