Well completion and work over fluid and method of use
Patent 4175042 Issued on November 20, 1979. Estimated Expiration Date: 
November 11, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 11, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3246692 3319715 3675717 3852201 Magnesia stabilized additives for non-clay wellbore fluids Method of well drilling and composition therefor Clay-free thixotropic wellbore fluid Water loss reduction agents Well completion and workover method Patent #: 4046197 InventorAssigneeApplicationNo. 05/850639 filed on 11/11/1977US Classes:507/207, Lignin or humate component contains sulfur or is reacted with substance containing sulfur (e.g., lignosulfonate, etc.)166/305.1, Placing fluid into the formation507/109, Includes metal compound other than an alkali or alkaline earth metal compound (e.g., Al, Cr, Fe, Mn, Cu, etc.)507/110, Organic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, xanthan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbons507/111, Carbohydrate is starch or derivative thereof507/113, Carboxyalkylcellulose (e.g., CMC, CMHEC, etc.)507/115, Carbohydrate is hydroxyalkyl ether derivative (e.g., HPG, etc.)507/208, Includes metal compound other than an alkali or alkaline earth metal compound (e.g., Al, Cr, Fe, Mn, Cu, etc.)507/211, Carbohydrate is polysaccharide507/212, Polysaccharide is starch or derivative thereof507/213, Polysaccharide is a xanthan (e.g., scleroglucans, etc.)507/215, Carboxyalkylcellulose (e.g., CMC, CMHEC, etc.)507/216, Hydroxyalkylcellulose (e.g., HEC, etc.)507/217, Polysaccharide is hydroxyalkyl ether derivative (e.g., HPG, etc.)507/925COMPLETION OR WORKOVER FLUIDExaminersPrimary: Guynn, Herbert B.Attorney, Agent or FirmInternational ClassesC09K 8/60 (20060101)C09K 8/02 (20060101) C09K 8/90 (20060101) C09K 8/50 (20060101) C09K 8/514 (20060101) C09K 8/20 (20060101) C09K 8/08 (20060101) AbstractA nondamaging work over and completion fluid having water soluble bridging agents includes a saturated brine solution having at least one water soluble salt which is insoluble in the saturated brine solution and having particle size range of about 5 microns to about 800 microns and wherein greater than about 5% of the particles are coarser than 44 microns. Viscosifier and suspension additive is added to provide the desired viscosity and assist in maintaining the water soluble sized salt suspended in the saturated brine solution. If desired or necessary a fluid loss control agent may be added to enhance the fluid loss control or filtration control of the completion fluid.The invention may be practiced by pumping or discharging the fluid or a slug or pill of the fluid into an oil, gas, water, injection or storage well where operations are to be conducted in which it is desired to temporarily plug the permeable zone while such operations are carried out. Thereafter, the water soluble bridging agents are removed by connate water from the permeable zone, or a nonsaturated brine wash, or ordinary water circulated in the well.Other References
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