CA1179939A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Concentric tubing having bonded insulation with the annulus
Assignee: Chevron USA Inc
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Filing: 1982-06-14
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Granted: 1984-12-27
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Expires: 2002-06-14
Abstract
Abstract ABSTRACT OF THE DISCLOSURE An insulated concentric tubing well element having an inner tubing and an outer tubing with a substan-tially solid insulating material in the annulus between the inner and outer tubing. A bonding material fills the voids in the annu?s and the surface of the solid insulating material. The bonding material prevents movement within the annulus and seals the annulus. Calcium silicote is disclosed as a suitable material for the solid insulation and sodium silicate is disclosed as the bonding material. A method is disclosed for producing the complete well element.
Inventors
- 👤 Stanley O. Hutchison
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-01 20:00
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/16; F16L59/21; E; E21; E21B; E21B36/00; E21B36/003; F16L59/15; Y; Y10; Y10S; Y10S138/00; Y10S138/01; Y10S138/09
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
149 words
A method for heat curing an insulated concentric conductor tubing wherein said tubing prior to curing includes a first conductor, a second conductor within said first conductor, an annular space between said conductors, a substantially solid insulating material within said annular space, and a liquid bonding material within said annular space in contact with said solid insulating material; the method steps of: (a) heating said concentric tubing conductor to cause said liquid bonding material to foam and dehydrate; (b) controlling said heating to gradually displace the liquid phase of said liquid bonding material leaving a residual of solidified foamed impermeable bonding material, (c) monitoring the displacement of said liquid phase of said bonding material to determine when said foamed bonding material has dispersed within said annular space surrounding said solid insulating material, (d) and terminating said heating when said liquid phase has been completely displaced within said annular space.
Claim 2
Independent Claim
149 words
A method for heat curing an insulated concentric conductor tubing wherein said tubing prior to curing includes a first conductor, a second conductor within said first conductor, an annular space between said conductors, a substantially solid insulating material within said annular space, and a liquid bonding material within said annular space in contact with said solid insulating material; the method steps of: (a) heating said concentric tubing conductor to cause said liquid bonding material to foam and dehydrate; (b) controlling said heating to gradually displace the liquid phase of said liquid bonding material leaving a residual of solidified foamed impermeable bonding material, (c) monitoring the displacement of said liquid phase of said bonding material to determine when said foamed bonding material has dispersed within said annular space surrounding said solid insulating material, (d) and terminating said heating when said liquid phase has been completely displaced within said annular space.
Claim 3
Dependent Claim
32 words
The method of Claim 1 wherein said liquid bond-ing material is circulated through said annular space to establish complete liquid contact with said first and second conductors and said solid insulation material.
Claim 4
Dependent Claim
32 words
The method of Claim 2 wherein said circulation is terminated and said liquid bonding material stands in said annular space to partially penetrate said solid insu-lating material before said heating is initiated.
Claim 5
Dependent Claim
45 words
The heat curing method of Claim 1 wherein said concentric tubing conductor with said liquid bonding mate-rial in said annular space is heated both within said second conductor and outside said first conductor to maintain uniform heat application when foaming and dehydrating said bonding material.
Claim 6
Dependent Claim
56 words
The method of Claim 1 wherein said liquid bond-ing material is an aqueous solution containing sodium silicate and said monitored displacement is liquid sodium silicate displaced by foamed sodium silicate, said heating being controlled to terminate said heating when substan-tially all liquid sodium silicate has been displaced while foamed sodium silicate remains in said annular space.
Claim 7
Dependent Claim
77 words
An insulated concentric conductor tubing having a substantially solid insulation in the annular space between said concentric conductors comprising: (a) a first conductor, (b) a second conductor within said first conductor and establishing said annular space between said first and second conductors, (c) a preformed, substantially solid insulating material within said annular space; (d) and a bonding material within said annular space substantially completely filling said annular space not filled by said preformed substantially solid insulating material.
Claim 8
Dependent Claim
77 words
An insulated concentric conductor tubing having a substantially solid insulation in the annular space between said concentric conductors comprising: (a) a first conductor, (b) a second conductor within said first conductor and establishing said annular space between said first and second conductors, (c) a preformed, substantially solid insulating material within said annular space; (d) and a bonding material within said annular space substantially completely filling said annular space not filled by said preformed substantially solid insulating material.
Claim 9
Dependent Claim
16 words
The insulated concentric conductor tubing of Claim 6 wherein said solid insulating material is calcium silicate.
Claim 10
Dependent Claim
16 words
The insulated concentric conductor tubing of Claim 6 wherein said bonding material is foamed sodium silicate.
Claim 11
Dependent Claim
24 words
The insulated concentric. conductor tubing of Claim 6 wherein said solid insulating material is calcium silicate and said bonding material is foamed sodium sili-
Claim 12
Independent Claim
77 words
A method for construction of a finite length section of insulated concentric conductor tubing compris-ing the steps of: positioning a preformed solid material in the annular space between said concentric conductors, flowing a liquid bonding material into said annular space around said solid material and in contact with said concentric conductors within said annular space, and causing said liquid bonding material to solidify within said annular space in contact with said solid mate-rial and said concentric conductors.
Claim 13
Independent Claim
77 words
A method for construction of a finite length section of insulated concentric conductor tubing compris-ing the steps of: positioning a preformed solid material in the annular space between said concentric conductors, flowing a liquid bonding material into said annular space around said solid material and in contact with said concentric conductors within said annular space, and causing said liquid bonding material to solidify within said annular space in contact with said solid mate-rial and said concentric conductors.
Claim 14
Dependent Claim
12 words
The method of Claim 10 wherein said solid mate-rial is calcium silicate.
Claim 15
Dependent Claim
13 words
The method of Claim 10 wherein said liquid bonding material is sodium silicate.
Claim 16
Dependent Claim
15 words
The method of Claim 12 wherein said sodium sili-cate is solidified by heating said tubing.
Claim 17
Dependent Claim
29 words
The method of Claim 13 wherein said heating causes said sodium silicate to dehydrate and said heating is continued until a vapor phase of said sodium silicate has terminated.
Claim 18
Dependent Claim
84 words
The method of Claim 10 wherein said annular space containing said preformed solid material is initially totally exposed to atmospheric pres-sure, said liquid bonding material is flowed into said annular space to displace atmospheric gases within said annular space, said liquid bonding material is heated to become a dehydrated foamed material, said heating continuing until said dehydrated foamed material has completely filled said annular space previously occupied by said liquid bonding material, and said annular space is then sealed against expo-sure to atmospheric pressure.
Claim 19
Dependent Claim
30 words
The method of Claim 10 wherein said liquid bond-ing material is flowed into said annular space by circu-lating said liquid bonding material to insure complete filling of said annular space.
Claim 20
Dependent Claim
42 words
The method of Claim 16 with the additional step of letting said concentric conductor tubing stand after circulating said liquid bonding material in said annular space to permit said liquid bonding material to penetrate at least the surface of said solid material.
Claim 21
Dependent Claim
47 words
The method of Claim 13 wherein said concentric conductor tubing is heated at both ends, inside and out-side of said finite length section to uniformly heat said section, then heat is removed from inside said section while heated air is circulated through the inside of said section.
Claim 22
Dependent Claim
68 words
The method of Claim 13 wherein said concentric conductor tubing is heated uniformly to raise the tempera-ture of the annular space to a temperature to dehydrate said liquid bonding material, and then heat is applied to the exterior of said section while heated air is circu-lated through the inner tubing of said section and dehydration of said liquid bonding material is monitored at the outside of said section.
References Cited (Backward Citations)
No citation records indexed.
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