High temperature, low density cementing method

• US 3,876,005 A
• Filed: 03/18/1974
• Issued: 04/08/1975
• Est. Priority Date: 01/24/1972
• Status: Expired due to Term

• Current Assignee: Arnold Fincher, Pat J. Broussard
• Original Assignee: Arnold Fincher, Pat J. Broussard
• Inventors: Fincher, Arnold, Broussard, Pat J.
• Primary Examiner(s): Novosad, Stephen J.
• Application Number:
  US05/452,108
• Time in Patent Office: 386 Days
• Field of Search: 166/292,293 106/97,89,120
• US Class Current: 166/292
• CPC Class Codes: C04B 18/08 Flue dust , i.e. fly ash
• CPC Class Codes: C04B 22/064 of the alkaline-earth metals
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C09K 8/46 containing inorganic binders, e.g. Portland cement
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A well bore penetrating a subterranean formation is cemented by placing a cementing composition comprising hydraulic cement, pozzolanic material, lime and water in the annulus defined by the conduit disposed in the well bore and maintaining the composition in the annulus until the composition hardens.

Claims

1. A METHOD OF CEMENTING A CONDUIT DISPOSED IN A WELL BORE PENETRATING A SUBSTERRANEAN FORMATION WHICH COMPRISES THE STEPS OF:

A. PLACING A CEMENTING COMPOSITION IN THE ANNULUS DEFINED BY THE CONDUIT DISPOSED IN THE WEL BORE, AND B. MAINTAINING SAID COMPOSITION IN SAID ANNULUS UNTIL SAID CEMENTING COMPOSITION HARDENS, WHEREIN SAID CEMENTING COMPOSITION COMPRISES A MIXTURE OF ABOUT 40 TO ABOUT 50 PARTS BY WEIGHT HYDRAULIC CEMENT, ABOUT 15 TO ABOUT 25 PARTS BY WEIGHT LINE, ABOUT 100 PARTS BY WEIGHT POZZOLANIC MATERIAL, AND AT LEAST SUFFICIENT WATER TO FORM A SLURRY.

2. The method of cementing a conduit disposed in a well bore as defined in claim 1 wherein said cementing composition comprises sufficient water to form a slurry having a density of about 12 to about 14.5 pounds per gallon.

3. The method of cementing a conduit disposed in a well bore as defined by claim 1 wherein said cementing composition comprises sufficient water to form a slurry having a density of about 12.7 to about 13.5 pounds per gallon.

4. The method of cementing a conduit disposed in a well bore as defined in claim 1 wherein said hydraulic cement is Portland cement.

5. The method of cementing a conduit disposed in a well bore as defined in claim 4 wherein said hydraulic cement is Portland cement selected from the group consisting of API Class A, B, C, D, E, F, G, and H cement and mixtures of these classes of cement.

6. The method of cementing a conduit disposed in a well bore as defined in claim 1 wherein said pozzolanic material is fly ash.

7. The method of cementing a conduit disposed in a well bore as defined in claim 1 wherein said cementing composition comprises a mixture of about 42 parts by weight Portland cement, about 21 parts by weight lime, about 100 parts by weight fly ash and sufficient water to form a slurry having a density of about 12 to about 14.5 pounds per gallon.