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| Number | Title | Issue Date |
| 6705398 | Fracture closure pressure determination A method for assessing the fracture pressure closure is proposed. This method includes first injecting a fluid into the formation at a first generally constant rate Q to create a fracture, and then, dropping the pumping rate to significantly smaller feed rate q so t... | 03/16/2004 |
| 6703352 | Viscoelastic surfactant fluids and related methods of use Viscoelastic surfactant based aqueous fluid systems useful as thickening agents in various applications, e.g. to suspend particles produced during the excavation of geologic formations. The surfactants are zwitterionic/amphoteric surfactants such as dihyd... | 03/09/2004 |
| 6667280 | Fluid system having controllable reversible viscosity This Invention relates to a novel reversible thickener, i.e., a fluid whose viscosity can be carefully modulated--from very low viscosity to sufficient viscosity to act as a barrier to further flow; particularly preferred embodiments are directed to fluid... | 12/23/2003 |
| 6660693 | Methods for dewatering shaly subterranean formations Methods are provided for increasing the production of hydrocarbons from shaly formations that contain adsorbed condensed hydrocarbon gases by treating such formations with dewatering compositions comprising surfactants that cause the surfaces of the forma... | 12/09/2003 |
| 6638896 | Fluids and techniques for hydrocarbon well completion The Invention relates to fluids and techniques to optimize/enhance the production of hydrocarbon from subterranean formations (e.g., "completion fluids"), in particular, fluids and techniques are. disclosed and claimed which remove wellbore damage and nea... | 10/28/2003 |
| 6632778 | Self-diverting resin systems for sand consolidation Herein is described a fluid that is useful in consolidating a formation without the use of a gravel pack and screen. In particular, the fluid is useful in consolidating heterogeneous formations where the permeability is not uniform over-the total formatio... | 10/14/2003 |
| 6616751 | Water-selective cementing composition A cementing composition comprising a hydraulic cement powder dispersed in a solvent that is miscible both with water and hydrocarbons to make a slurry. The cement powder can be made up simply of hydraulic cement materials or can be a mixture of such mater... | 09/09/2003 |
