Cement compositions and process of cementing wells

• US 2,880,096 A
• Filed: 12/06/1954
• Issued: 03/31/1959
• Est. Priority Date: 12/06/1954
• Status: Expired due to Term

• Current Assignee: James R. Hurley
• Original Assignee: James R. Hurley
• Inventors: Hurley, James R.
• Application Number:
  US03/473,174
• Time in Patent Office: 1,576 Days
• US Class Current: 166/293
• CPC Class Codes: C04B 14/08 Diatomaceous earth
• CPC Class Codes: C04B 14/10 Clay sepiolite C04B14/042; grog C04B18/025
• CPC Class Codes: C04B 22/00 Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators , shrinkage compensating agents
• CPC Class Codes: C04B 24/383 Cellulose or derivatives thereof
• CPC Class Codes: C04B 28/04 Portland cements
• CPC Class Codes: C09K 8/46 containing inorganic binders, e.g. Portland cement

Claims

1. A CEMENT COMPOSITION CONSISTING ESSENTIALLY OF A MAJOR PORTION OF A DRY HYFRAULIC CEMENT MIXED WITH MINOR WEIGHT PERCENTAGES OF THE WEIGHT OF SAID DRY HYDRAULIC CEMENT OF 0.1 TO 10% OF A CEMENT THICKENING TIME EXTENDING AND WATER LOSS REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF ACID CARBOXALKYL HYDROXYETHYL CELLULOSE MIXED ETHERS IN WHICH THE ALKYL GROUP CONTAINS ONE TO TWO CARBON ATOMS, THE TOTAL SUBSSTITUTION PER ANHYDROGLUCOSE UNIT OF THE CELLULOSE OF CARBOXYALKYL AND HYDROXYETHYL GROUPS IS BETWEEN 0.5 TO 1.75 THE HYDROXYALKYL SUBSTITUTION IS FROM 0.15 TO 1.2, AND SALTS OF SAID MIXED ETHERS, AND 0.3 TO 10% OF A CEMENT THICKENING TIME REDUCING AGENT HAVING SUBSTANTIALLY NO EFFECT ON SAID WATER LOSS CONSISTING OF AN ALKALI METAL ALUMINATE.