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| Number | Title | Issue Date |
| 5629271 | Methods of reducing fluid loss and polymer concentration of well drilling and servicing fluids The invention provides methods for (1) reducing the fluid loss of and (2) reducing the concentration of polymer required to provide a desired degree of fluid loss control to, a well drilling and servicing fluid which contains at least one polymeric viscos... | 05/13/1997 |
| 5514644 | Polysaccharide containing fluids having enhanced thermal stability The invention provides (1) a method of increasing the thermal stability of an aqueous polysaccharide-containing fluid by adding thereto magnesia and a thiosulfate salt; (2) a drilling, completion, or workover fluid comprising an aqueous liquid, a water so... | 05/07/1996 |
| 4822500 | Saturated brine well treating fluids and additives therefore Disclosed are well working and treating fluids comprising a saturated aqueous saline solution, a particulate water soluble salt which is insoluble in the saturated saline solution, xanthomonas gum, and an epichlorohydrin crosslinked hydroxypropyl starch d... | 04/18/1989 |
