Time setting clay cement and method of correcting lost circulation

• US 2,861,636 A
• Filed: 04/18/1952
• Issued: 11/25/1958
• Est. Priority Date: 04/18/1952
• Status: Expired due to Term

• Current Assignee: Messenger, Joseph U.
• Original Assignee: Messenger, Joseph U.
• Inventors: Messenger, Joseph U.
• Application Number:
  US03/283,129
• Time in Patent Office: 2,412 Days
• US Class Current: 166/292
• CPC Class Codes: C04B 14/10 Clay sepiolite C04B14/042; grog C04B18/025
• CPC Class Codes: C04B 22/16 containing phosphorus in the anion, e.g. phosphates
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 7/345 Hydraulic cements not provided for in one of the groups C04B7/02 - C04B7/34
• CPC Class Codes: C09K 8/42 Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells compositions for plastering C09K8/50
• CPC Class Codes: C09K 8/845 containing inorganic compounds
• CPC Class Codes: E21B 21/003 Means for stopping loss of drilling fluid plastering the borehole wall E21B33/138

Claims

5. A METHOD OF CORRECTING LOST RETURNS OF DRILLING FLUID IN THE DRILLING OF A WELL INTO THE EARTH COMPRISING PLACING IN SAID WELL AT A LOCATION WHERE DRILLING FLUID IS BEING LOST FROM SAID WELL INTO AN EARTH FORMATION A SLURRY OF CLAY CEMENT COMPRISING A CLAY HAVING GEL STRENGTH PROPERTIES, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACTIVATED SILICA, ACTIVATED ALUMINA, AND SILICA-ALUMINA IN AN AMOUNT NOT GREATER THAN ABOUT 10 PERCENT BY WEIGHT OF SAID CLAY CEMENT, SAID SILICA-ALUMINA HAVING THE FORMULA MA(SIO2)B(A12O3)C(H2O)D, WHERE M IS SELECTED FROM THE GROUP CONSISTING OF THE ALKALI AND ALKALINE EARTH METALS AND A=0-0.08, B=0.7-1.56, C=0.02-0.4, AND D=0.25-1.0, AND WATER IN AN AMOUNT NOT GREATER THAN ABOUT 65 PERCENT BY WEIGHT OF SAID SLURRY.