Cement composition

• US 2,852,402 A
• Filed: 01/03/1955
• Issued: 09/16/1958
• Est. Priority Date: 01/03/1955
• Status: Expired due to Term

• Current Assignee: Francis J. Shell
• Original Assignee: Francis J. Shell
• Inventors: Shell, Francis J.
• Application Number:
  US03/479,360
• Time in Patent Office: 1,352 Days
• US Class Current: 106/730
• CPC Class Codes: C04B 14/08 Diatomaceous earth
• CPC Class Codes: C04B 22/124 Chlorides of ammonium or of the alkali or alkaline earth metals, e.g. calcium chloride
• CPC Class Codes: C04B 24/383 Cellulose or derivatives thereof
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: E21B 33/02 Surface sealing or packing
• CPC Class Codes: E21B 33/16 using plugs for isolating cement charge; Plugs therefor stage cementing E21B33/146; spacer compositions C09K8/424

Claims

1. A CEMENT COMPOSITION AQUEOUS SLURRY COMPRISING A MAJOR PORTION OF A DRY HYDRAULIC CEMENT MIXED WITH MINOR WEIGHT PERCENTAGES OF THE WEIGHT OF SAID DRY HYDRAULIC CEMENT OF 0.1 TO 10% OF A WATER LOSS REDUCING AGENT CONSISTING OF ACID CARBOXYALKYL HYDROXYETHYL CELLULOSE MIXED ETHERS IN WHICH THE ALKYL GROUP CONTAINS 1 TO 2 CARBON ATOMS, THE TOTAL SUBSTITUTION PER ANHYDROGLUCOSE UNIT OF THE CELLULOSE OF CARBOXYALKYL AND HYDROXYETHYL GROUPS IS BETWEEN 0.5 TO 1.75, THE HYDROXYETHYL SUBSTITUTION IS FROM 0.35 TO 1.35, AND THE CARBOXYALKYL SUBSTITUTION IS FROM 0.15 TO 1.2, AND SALTS OF SAID MIXED ETHERS, SUFFICIENT WATER TO MAKE SAID SLURRY FLUID, AND FROM 500 TO 20,000 PARTS PER MILLION BY WEIGHT SODIUM CHLORIDE IN SAID WATER AS A SECOND WATER LOSS REDUCING AGENT.