| US 7,514,392 B2 | ||
| Shale hydration inhibition agent and method of use | ||
| Arvind D. Patel, Sugarland, Tex. (US); and Emanuel Stamatakis, Houston, Tex. (US) | ||
| Assigned to M-I L.L.C., Houston, Tex. (US) | ||
| Filed on May 06, 2005, as Appl. No. 11/123,394. | ||
| Application 11/123394 is a continuation in part of application No. 10/958635, filed on Oct. 05, 2004, granted, now 7,312,183. | ||
| Prior Publication US 2006/0073983 A1, Apr. 06, 2006 | ||
| Int. Cl. C09K 8/035 (2006.01) | ||
| U.S. Cl. 507—239 [507/129; 507/248] | 4 Claims |
| 1. A water-base well bore fluid for use in a subterranean well penetrating through one or more subterranean formations containing
a shale which swells in the presence of water, wherein the fluid comprises:
an aqueous based continuous phase;
a weighting agent; and
a shale hydration inhibition agent having the formula:
 in which R and R′ independently selected from hydrogen, methyl, ethyl or propyl, R″ is a bridging group having 1 to 20 carbon
atoms and n has a value from 1 to 4 and X is an amine, hydroxyl, alkoxy, carboxy group, in which at least one of the amine
functional groups have been reacted with a predetermined amount of C1 to C25 carboxylic acid; and
wherein the concentration of shale hydration inhibition agent is from about 0.5 to about 20 pounds per barrel of the water
base well bore fluid.
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