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US3926257A
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US
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Well cementing processes
Assignee: Engie SA
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Filing: 1974-05-14
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Granted: 1975-12-16
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Expires: 1994-05-14
Abstract
Abstract A cementing process wherein a foaming agent is added to the cement slurry prior to injecting the latter into a well. This foaming agent cooperates with the gas which escapes from a gas-containing formation to form a foam barrier which prevents any subsequent migration of gas during the setting of the cement.
Inventors
- 👤 Jacques Marrast
- 👤 Louis Minssieux
- 👤 Eric Blondin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:25
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B38/00; C04B38/10; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C09K8/467; C09K8/473; C09K8/493; C09K8/50; C09K8/516; C09K8/518; E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
59 words
IN A PROCESS FOR CEMENTING A CASING IN A WELL TRAVERSING AT LEAST ONE GAS-CONTAINING FORMATION IN WHICH CEMENT IS PLACED IN THE ANNULUS FORMED BETWEEN THE WELLBORE AND THE CASING THE IMPROVEMENT WHEREIN CEMENTING IS EFFECTED BY INJECTING A CEMENT SLURRY CONTAINING A FOAMING AGENT WHICH BY COOPERATING WITH THE GAS OF THE FORMATION PRODUCES A FOAM BARRIER
Claim 2
Dependent Claim
59 words
IN A PROCESS FOR CEMENTING A CASING IN A WELL TRAVERSING AT LEAST ONE GAS-CONTAINING FORMATION IN WHICH CEMENT IS PLACED IN THE ANNULUS FORMED BETWEEN THE WELLBORE AND THE CASING THE IMPROVEMENT WHEREIN CEMENTING IS EFFECTED BY INJECTING A CEMENT SLURRY CONTAINING A FOAMING AGENT WHICH BY COOPERATING WITH THE GAS OF THE FORMATION PRODUCES A FOAM BARRIER
Claim 3
Dependent Claim
21 words
A cementing process according to claim 1, wherein a compound for accelerating the cement setting is incorporated to the cement slurry.
Claim 4
Dependent Claim
29 words
A cementing process according to claim 1, wherein the foaming agent consists of a monophasic aqueous solution containing at least one ionic surfactant and at least one non-ionic surfactant.
Claim 5
Dependent Claim
13 words
A cementing process according to claim 3, wherein the ionic surfactant is anionic.
Claim 6
Dependent Claim
13 words
A cementing porcess according to claim 3, wherein the ionic surfactant is cationic.
Claim 7
Dependent Claim
35 words
A cementing process according to claim 3, wherein the non-ionic surfactant is selected from the group consisting of ethoxy alkylphenols, ethoxy fatty alcohols, condensation products of ethylene oxide with glycolpropylene and esters of ethoxy sorbitol.
Claim 8
Dependent Claim
38 words
A cementing process according to claim 4, wherein the anionic surfactant is selected from the group consisting of sulfates of fatty alcohols, sulfates of polyethoxy fatty alcohols, sulfates of ethoxy alkylphenols and phosphoric esters of ethoxy fatty alcohols.
Claim 9
Dependent Claim
16 words
A cementing process according to claim 5, wherein the cationic surfactant is a quaternary ammonium salt.
Claim 10
Dependent Claim
30 words
A cementing process according to claim 1 to wherein the cement slurry is prepared by first admixing cement and water and then incorporating said foaming agent into the resulting mixture.
Claim 11
Dependent Claim
30 words
A cementing process according to claim 1 to wherein said foaming agent is formed of at least one oxyethylene aliphatic compound and at least one sulfate of polyethoxy fatty alcohol.
Claim 12
Dependent Claim
27 words
A cementing process according to claim 1 to wherein the aqueous phase of the cement slurry contains from 0.1 to 5 percent by weight of foaming agent.
Claim 13
Dependent Claim
25 words
A cementing process according to claim 11, wherein the aqueous phase of the cement slurry contains from 0.5 to 2 weight percent of foaming agent.
Claim 14
Dependent Claim
27 words
A cementing process according to claim 1, wherein cementing is effected by injecting a cement composition consisting essentially of an aqueous cement slurry and a foaming agent.
Claim 15
Dependent Claim
26 words
A cementing process according to claim 13, wherein cementing is effected by injecting a cement composition consisting of an aqueous cement slurry and a foaming agent.
Claim 16
Dependent Claim
92 words
In a process for cementing a casing in a well traversing at least one gas-containing formation in which cement is placed in the annulus formed between the wellbore and the casing, the improvement comprising injecting into said annulus a cement slurry containing a foaming agent capable of producing in said cement slurry before complete setting thereof a foam barrier if gas from said formation begins to diffuse through said cement slurry said foam barrier being sufficiently stable to prevent migration of gas through said foam barrier during setting of the cement slurry.
Claim 17
Dependent Claim
92 words
In a process for cementing a casing in a well traversing at least one gas-containing formation in which cement is placed in the annulus formed between the wellbore and the casing, the improvement comprising injecting into said annulus a cement slurry containing a foaming agent capable of producing in said cement slurry before complete setting thereof a foam barrier if gas from said formation begins to diffuse through said cement slurry said foam barrier being sufficiently stable to prevent migration of gas through said foam barrier during setting of the cement slurry.
Claim 18
Dependent Claim
24 words
The process of claim 15, wherein a composition consisting essentially of an aqueous cement slurry and said foaming agent is injected into said annulus.
Claim 19
Dependent Claim
23 words
The process of claim 16, wherein a composition consisting of said aqueous cement slurry and said foaming agent is injected into said annulus.
Claim 20
Dependent Claim
100 words
In a process for cementing a casing in a well traversing at least one gas-containing formation in which cement is placed in the annulus formed between the wellbore and the casing, the improvement comprising injecting into the annulus a cement slurry containing an organic component consisting essentially of a foaming agent in an amount sufficient to form a foam within the pores of the cement slurry prior to complete setting thereof upon contact of said cement slurry with gas from said formation, said foam being sufficiently stable to form a foam barrier materially reducing the gas permeability of said cement.
Claim 21
Dependent Claim
100 words
In a process for cementing a casing in a well traversing at least one gas-containing formation in which cement is placed in the annulus formed between the wellbore and the casing, the improvement comprising injecting into the annulus a cement slurry containing an organic component consisting essentially of a foaming agent in an amount sufficient to form a foam within the pores of the cement slurry prior to complete setting thereof upon contact of said cement slurry with gas from said formation, said foam being sufficiently stable to form a foam barrier materially reducing the gas permeability of said cement.
Claim 22
Dependent Claim
14 words
The process of claim 18, wherein said organic component consists of said foaming agent.
Claim 23
Dependent Claim
26 words
The process of claim 18, wherein said foaming agent is composed of a mixture of at least one ionic surfactant and at least one non-ionic surfactant.
Claim 24
Dependent Claim
39 words
The process of claim 20, wherein said ionic surfactant is selected from the group consisting of sulfates of fatty alcohols, sulfates of polyethoxy fatty alcohols, sulfates of ethoxy alkylphenols, phosphoric esters of ethoxy fatty alcohols and quaternary ammonium salts.
Claim 25
Dependent Claim
33 words
The process of claim 21, wherein said non-ionic surfactant is selected from the group consisting of ethoxy alkylphenols, ethoxy fatty alcohols, condensation products of ethylene oxide and glycolpropylenes and esters of ethoxy sorbitol.
Claim 26
Dependent Claim
33 words
The process of claim 20, wherein said non-ionic surfactant is selected from the group consisting of ethoxy alkylphenols, ethoxy fatty alcohols, condensation products of ethylene oxide and glycolpropylenes and esters of ethoxy sorbitol.
Claim 27
Dependent Claim
25 words
The process of claim 20, wherein said foaming agent comprises at least one oxyethylene aliphatic compound and at least one sulfate of polyethoxy fatty alcohol.
Claim 28
Dependent Claim
30 words
The process of claim 18, wherein said cement slurry contains 0.1 to 5 weight percent of said foaming agent based on the weight of the aqueous phase of said slurry.
Claim 29
Dependent Claim
30 words
The process of claim 25, wherein said cement slurry contains 0.5 to 2 weight percent of said foaming agent based on the weight of the aqueous phase of said slurry.
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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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |