US4065318A
Expired / Lapsed
US
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Well cementing
Assignee: REED LIGNIN Inc A CORP OF DE
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Filing: 1976-03-29
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Granted: 1977-12-27
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Expires: 1996-03-29
Abstract
Abstract Wells and like borings into the earth's surface, especially those for the production of petroleum and gas, are very well and efficaciously cemented with cement compositions or pastes containing, as their effective gel control and cement set retardation agent, an additive that is a resulfonated, alkaline oxidized, hydrolyzed, partially desulfonated lignosulfonate product.
Inventors
- 👤 William John Detroit
- 👤 Michael Elliot Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:40
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C04; C04B; C04B24/00; C04B24/16; C04B24/18
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
126 words
In a cementing composition comprised of a hydraulic cement, a retarding agent additive therefor which is, in an amount between about 0.05 percent and about 3 percent based on cement composition weight; an alkaline oxidized, hydrolyzed, partially desulfonated and subsequently resulfonated lignosulfonate, said resulfonated lignosulfonate having substituted herein as the resulfonation units, those of the formula: --(CH 2 ) x --SO 3 H, wherein x has a numerical integral value from 0 to 3, and alkali metal salt derivatives thereof; said resulfonated lignosulfonate containing, on a percent by weight basis, based on lignosulfonate weight, between about 11/2 percent and about 15 percent of total sulfur in combined organic sulfonic sulfonate form; said lignosulfonate prior to resulfonation having a relative molecular size of substantially 1000 to 20,000.
Claim 2
Dependent Claim
126 words
In a cementing composition comprised of a hydraulic cement, a retarding agent additive therefor which is, in an amount between about 0.05 percent and about 3 percent based on cement composition weight; an alkaline oxidized, hydrolyzed, partially desulfonated and subsequently resulfonated lignosulfonate, said resulfonated lignosulfonate having substituted herein as the resulfonation units, those of the formula: --(CH 2 ) x --SO 3 H, wherein x has a numerical integral value from 0 to 3, and alkali metal salt derivatives thereof; said resulfonated lignosulfonate containing, on a percent by weight basis, based on lignosulfonate weight, between about 11/2 percent and about 15 percent of total sulfur in combined organic sulfonic sulfonate form; said lignosulfonate prior to resulfonation having a relative molecular size of substantially 1000 to 20,000.
Claim 3
Dependent Claim
25 words
The composition of claim 1, wherein there is between about 23/4 and about 10 wt. % of said total combined sulfur in said lignosulfonate additive.
Claim 4
Dependent Claim
25 words
The composition of claim 1, wherein there is between about 41/2 and about 61/2 wt. % of said total combined sulfur in said lignosulfonate additive.
Claim 5
Dependent Claim
25 words
The composition of claim 1, wherein said resulfonation unit in the lignosulfonate additive is a sulfomethyl group of the formula --(CH 2 )SO 3 H.
Claim 6
Dependent Claim
18 words
The composition of claim 1 wherein said lignosulfonate additive is in the form of an alkali metal salt.
Claim 7
Dependent Claim
17 words
The composition of claim 1 wherein said lignosulfonate additive is in the form of a sodium salt.
Claim 8
Dependent Claim
19 words
The composition of claim 1 containing between about 0.2 and 1.5 wt. % of said lignosulfonate retarding agent additive.
Claim 9
Dependent Claim
19 words
The composition of claim 1 containing between about 0.3 and 1 wt. % of said lignosulfonate retarding agent additive.
Claim 10
Independent Claim
110 words
A method or preparing cementing compositions which comprises adding to and dispersing in a hydraulic cement mixture of at least about 0.05 percent, based on resulting composition weight, of a retarding agent for the composition which is an alkaline oxidized, hydrolyzed, partially desulfonated and subsequently resulfonated lignosulfonate, said resulfonated lignosulfonate havine substituted therein as the resulfonation units, those of the formula: --(CH 2 ) x --SO 3 H, wherein x has a numerical integral value from 0 to 3, and alkali metal salt derivatives thereof; said resulfonated lignosulfonate containing, based on lignosulfonate weight, between about 11/2 percent and about 15 percent of total sulfur in combined organic sulfonic sulfonate form.
Claim 11
Independent Claim
110 words
A method or preparing cementing compositions which comprises adding to and dispersing in a hydraulic cement mixture of at least about 0.05 percent, based on resulting composition weight, of a retarding agent for the composition which is an alkaline oxidized, hydrolyzed, partially desulfonated and subsequently resulfonated lignosulfonate, said resulfonated lignosulfonate havine substituted therein as the resulfonation units, those of the formula: --(CH 2 ) x --SO 3 H, wherein x has a numerical integral value from 0 to 3, and alkali metal salt derivatives thereof; said resulfonated lignosulfonate containing, based on lignosulfonate weight, between about 11/2 percent and about 15 percent of total sulfur in combined organic sulfonic sulfonate form.
Claim 12
Dependent Claim
105 words
In a cementing composition comprised of a hydraulic cement, a retarding agent additive therefor, in an amount of at least 0.05 percent based on cement composition weight, which is a lignosulfonate derived from sulfite waste liquor that has been subjected to alkaline oxidation, hydrolysis and partial desulfonation with subsequent resulfonation; said lignosulfonate prior to resulfonation containing combined organic sulfonic sulfur after partial desulfonation of between about 0.5 percent and about 5.0 percent when calculated on the basis of the amount of sulfur present by weight in said lignosulfonate and containing from about 1.5 percent to about 15 percent by weight upon completion of said resulfonation.
Claim 13
Dependent Claim
105 words
In a cementing composition comprised of a hydraulic cement, a retarding agent additive therefor, in an amount of at least 0.05 percent based on cement composition weight, which is a lignosulfonate derived from sulfite waste liquor that has been subjected to alkaline oxidation, hydrolysis and partial desulfonation with subsequent resulfonation; said lignosulfonate prior to resulfonation containing combined organic sulfonic sulfur after partial desulfonation of between about 0.5 percent and about 5.0 percent when calculated on the basis of the amount of sulfur present by weight in said lignosulfonate and containing from about 1.5 percent to about 15 percent by weight upon completion of said resulfonation.
Claim 14
Dependent Claim
63 words
A cementing composition as claimed in claim 10 wherein said lignosulfonate prior to resulfonation is characterized by a relative molecular size within the range of 1000 to 20,000 and said resulfonation is undertaken in an aqueous medium and in the presence of a reactant composition comprising about 5 percent to about 40 percent by weight of said desulfonated lignosulfonate of alkali metal sulfite.
Claim 15
Dependent Claim
16 words
A cementing composition as claimed in claim 11 wherein said sulfite is an alkali metal bisulfite.
Claim 16
Dependent Claim
14 words
A cementing composition as claimed in claim 12 wherein said sulfite is sodium bisulfite.
Claim 17
Dependent Claim
36 words
A cementing composition as claimed in claim 13 wherein said reactant composition includes one or more aldehydes of the formula: ##STR2## wherein R is hydrogen or an alkyl group containing from 1 to 3 carbon atoms.
Claim 18
Dependent Claim
13 words
A cementing composition as claimed in claim 14 wherein said aldehyde is formaldehyde.
Claim 19
Dependent Claim
30 words
A cementing composition as claimed in claim 15 wherein said formaldehyde is present in an amount by weight of said partially desulfonated lignosulfonate of about 1.5 percent to 12 percent.
Claim 20
Dependent Claim
22 words
A cementing composition as claimed in claim 16 wherein said aldehyde is present with an alkali metal bisulfite in approximately stoichiometric proportions.
Claim 21
Dependent Claim
23 words
A cementing composition as claimed in claim 17 wherein said stoichiometric proportions of aldehyde to bisulfite may vary by up to 20 percent.
Claim 22
Dependent Claim
36 words
A cementing composition as claimed in claim 10 wherein said retarding agent is characterized in being substantially completely soluble in each of aqueous saline solutions and acid media having a pH of at least about 1.5.
Claim 23
Dependent Claim
56 words
A cementing composition as claimed in claim 10 wherein said lignosulfonate prior to resulfonation is characterized by a pH in aqueous solution of 8.5 percent to 9.2 percent; a total sulfur content of 2.5 percent to 2.9 percent by weight; the absence of reducing sugars; and a lignosulfonate content of at least 99 percent by weight.
Claim 24
Dependent Claim
25 words
A cementing composition as claimed in claim 10 wherein said lignosulfonate is further characterized by a methoxyl content of from 12.4 to 12.9 weight percent.
Claim 25
Dependent Claim
18 words
A cementing composition as claimed in claim 20 wherein said lignosulfonate has a relative molecular size of 4200.
Claim 26
Dependent Claim
19 words
A cementing composition as claimed in claim 20 wherein said lignosulfonate has a relative molecular size of about 3500.
Claim 27
Dependent Claim
33 words
A cementing composition as claimed in claim 10 wherein said combined organic sulfonic sulfur is present in said lignosulfonate prior to resulfonation in a range of between about 1.75 percent and 3.25 percent.
Claim 28
Dependent Claim
33 words
A cementing composition as claimed in claim 24 wherein said combined organic sulfonic sulfur is present in said lignosulfonate prior to resulfonation in a range of between about 2.2 percent and 2.8 percent.
Claim 29
Dependent Claim
23 words
A method as claimed in claim 9 wherein said lignosulfonate prior to resulfonation has a relative molecular size of substantially 1000 to 20,000.
Claim 30
Dependent Claim
37 words
A method as claimed in claim 9 wherein said total sulfur in combined organic sulfonic sulfur form is present upon completion of resulfonation in an amount by weight of from about 2.75 percent to about 10 percent.
Claim 31
Dependent Claim
41 words
A method as claimed in claim 9 wherein said resulfonation is undertaken in an aqueous medium and in the presence of a reactant composition comprising about 5 percent to 40 percent, by weight of said desulfonated lignosulfonate, of alkali metal sulfite.
Claim 32
Dependent Claim
15 words
A method as claimed in claim 28 wherein said alkali metal sulfite is sodium bisulfite.
Claim 33
Dependent Claim
12 words
A method as claimed in claim 29 wherein said aldehyde is formaldehyde.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |