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US3877522A Expired / Lapsed US ⏱️ 0.0 years remaining

Use of radiation-induced polymers in cement slurries

Assignee: Zeneca Inc
•
Filing: 1972-11-06
•
Granted: 1975-04-15
•
Expires: 1992-11-06
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Abstract

Abstract Water loss from cement slurries is reduced by incorporating within a cement slurry a polymer obtained as a product of radiation-induced polymerization of acrylamide and/or methacrylamide and acrylic acid, methacrylic acid, and/or alkali metal salts thereof. The polymerization is preferably carried out in 10-60% aqueous monomer solution with gamma radiation. The aqueous monomer solution preferably contains 25-99% acrylamide and 75-1% sodium acrylate. The polymer can be present in concentration of about 0.001 to about 3.0 weight percent, based on the aqueous phase of the slurry.

Inventors

  • 👤 Bruce L Knight
  • 👤 John S Rhudy
  • 👤 William B Gogarty

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 06:18
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B24/2652; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/52; C08F220/54; C08F220/56; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C09K8/467; C09K8/487; C09K8/50; C09K8/504; C09K8/506; C09K8/508; C09K8/5083; E; E21; E21B; E21B43/00; C04B2103/00; C04B2103/46

Claims Analysis

Total Claims: 18
Claim 1
Independent Claim 148 words
IN THE PROCESS OF CEMENTING A WELL IN FLUID COMMUNICATION WITH A SUBTERRANEAN RESEVOIR WHEREIN A CEMENT SLURRY IS INJECTED DOWN THE WELL BORE, THE CEMENT SLURRY CONTAINING A HIGH MOLECULAR WEIGHT POLYMER DISSOLVED IN THE WATER PHASE OF THE CEMENT SLURRY TO INHIBIT FLUID LOSS FROM THE CEMENT SLURRY, THE STEP COMPRISING INCORPORATING WITHIN THE AQUEOUS PHASE OF THE CEMENT SLURRY A POLMER OBTAINED AS A PRODUCT OF HIGH ENERGY IONIZATION RADIATION POLYMERIZATION OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE AND METHACRYLAMIDE AND AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID, METHACRYLIC ACID, ALKALI METAL ACRYLATE, AND ALKALI META METHACRYLATE IN CONCENTRATIONS OF ABOUT 10% TO ABOUT 60% BY WEIGHT DISSOLVED MONOMER IN AN AQUEOUS MEDIUM, THE RADIATION INTENSITY BEING ABOUT 250 TO ABOUT 1,000,000 RADS/HR AND THE RADIATION DOSE BEING ABOUT 500 RADS TO ABOUT 300,000 RADS.
Claim 2
Dependent Claim 148 words
IN THE PROCESS OF CEMENTING A WELL IN FLUID COMMUNICATION WITH A SUBTERRANEAN RESEVOIR WHEREIN A CEMENT SLURRY IS INJECTED DOWN THE WELL BORE, THE CEMENT SLURRY CONTAINING A HIGH MOLECULAR WEIGHT POLYMER DISSOLVED IN THE WATER PHASE OF THE CEMENT SLURRY TO INHIBIT FLUID LOSS FROM THE CEMENT SLURRY, THE STEP COMPRISING INCORPORATING WITHIN THE AQUEOUS PHASE OF THE CEMENT SLURRY A POLMER OBTAINED AS A PRODUCT OF HIGH ENERGY IONIZATION RADIATION POLYMERIZATION OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE AND METHACRYLAMIDE AND AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID, METHACRYLIC ACID, ALKALI METAL ACRYLATE, AND ALKALI META METHACRYLATE IN CONCENTRATIONS OF ABOUT 10% TO ABOUT 60% BY WEIGHT DISSOLVED MONOMER IN AN AQUEOUS MEDIUM, THE RADIATION INTENSITY BEING ABOUT 250 TO ABOUT 1,000,000 RADS/HR AND THE RADIATION DOSE BEING ABOUT 500 RADS TO ABOUT 300,000 RADS.
Claim 3
Dependent Claim 13 words
The process of claim 1 wherein one of the monomers is acrylic acid.
Claim 4
Dependent Claim 13 words
The process of claim 1 wherein one of the monomers is methacrylic acid.
Claim 5
Dependent Claim 13 words
The process of claim 1 wherein one of the monomers is sodium acrylate.
Claim 6
Dependent Claim 13 words
The process of claim 1 wherein one of the monomers is sodium methacrylate.
Claim 7
Dependent Claim 12 words
The process of claim 1 wherein one of the monomers is acrylamide.
Claim 8
Dependent Claim 18 words
The process of claim 1 wherein the polymer is a copolymer obtained by copolymerizing acrylamide and sodium acrylate.
Claim 9
Dependent Claim 20 words
The process of claim 1 wherein the radiation intensity is within the range of about 1,000 to about 300,000 rads/hr.
Claim 10
Dependent Claim 20 words
The process of claim 1 wherein the radiation dose is within the range of about 1,000 to about 100,000 rads.
Claim 11
Dependent Claim 22 words
The process of claim 1 wherein the aqueous medium is at a pH within the range of about 3 to about 13.
Claim 12
Dependent Claim 22 words
The process of claim 1 wherein the pH of the aqueous medium is within the range of about 8 to about 11.
Claim 13
Dependent Claim 126 words
In the process of cementing a well in fluid communication with a subterranean reservoir wherein a cement slurry is injected down the well bore, the cement slurry containing a high molecular weight polymer dissolved in the aqueous phase of the cement slurry to inhibit fluid loss from the slurry, the step comprising incorporation within the water of the cement slurry a polymer obtained as a product of radiation copolymerization of an aqueous solution comprised of about 10 to about 60% of a mixture of about 25 to about 99% of acrylamide and about 75 to about 1% of sodium acrylate, the radiation intensity being within the range of about 250 to about 1,000,000 rads/hr. and the radiation dose being about 500 rads to about 300,000 rads.
Claim 14
Dependent Claim 126 words
In the process of cementing a well in fluid communication with a subterranean reservoir wherein a cement slurry is injected down the well bore, the cement slurry containing a high molecular weight polymer dissolved in the aqueous phase of the cement slurry to inhibit fluid loss from the slurry, the step comprising incorporation within the water of the cement slurry a polymer obtained as a product of radiation copolymerization of an aqueous solution comprised of about 10 to about 60% of a mixture of about 25 to about 99% of acrylamide and about 75 to about 1% of sodium acrylate, the radiation intensity being within the range of about 250 to about 1,000,000 rads/hr. and the radiation dose being about 500 rads to about 300,000 rads.
Claim 15
Dependent Claim 20 words
The process of claim 12 wherein the copolymer obtained from the radiation polymerization is in the form of a gel.
Claim 16
Dependent Claim 27 words
The process of claim 12 wherein the aqueous medium contains from about 85% to about 45% of acrylamide and about 15% to about 55% of sodium acrylate.
Claim 17
Dependent Claim 11 words
The process of claim 12 wherein the radiation is gamma radiation.
Claim 18
Dependent Claim 20 words
The process of claim 12 wherein the sodium acrylate is present in a concentration of about 20% to about 50%.

References Cited (Backward Citations)

US3114419A Cited
US3152641A Cited
US3336979A Cited
US3493529A Cited
US3502149A Cited
US3490533A Cited
US3749172A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-04-14 1978-10-14 1979-04-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-04-14 1982-10-14 1983-04-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-04-14 1986-10-14 1987-04-15 $7700.00 Window Closed / Lapsed

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