Abstract: The medical resource for chronic pain patients are forecasted using a method or computer software product to improve accuracy in forecasting medical resources, decrease the time required to forecast medical resources, and many other benefits. Desired patient indicia including direct medical indicia, indirect medical indicia, and non-medical indicia are selected to serve as independent variables. At least one chronic pain indication is selected to serve as a dependent variable. A chronic pain forecasting model is created using the patient indicia and the chronic pain indication. The chronic pain forecasting model is applied to a chronic pain patient indicia to create a patient forecast. Many different embodiments of the chronic pain patient dynamic medical resources forecaster method and software product are possible.

Abstract: A clay-free, i.e., non-argillaceous brine wellbore fluid having unstructured viscosity and improved water loss properties from an additive composition present in an amount of 0.1 to 3 weight % based on wellbore fluid and consisting essentially of 15 to 95 weight % of guar gum or hydroxyalkyl guar gum and 5 to 85 weight % of a water soluble salt, preferably alkaline earth salt of lignosulfonate.

Abstract: A clay-free, i.e., non-argillaceous wellbore fluid, having unstructured viscosity is obtained by combining water with an additive composition comprising guar gum and at least 10 weight percent of magnesia or magnesium hydroxide based on the weight of guar gum.

Abstract: A clay-free, i.e., non-argillaceous brine wellbore fluid having unstructured viscosity and improved water loss properties from an additive composition present in an amount of 0.1 to 3 weight % based on wellbore fluid and consisting essentially of 15 to 95 weight % of guar gum or hydroxyalkyl guar gum and 5 to 85 weight % of a water soluble salt, preferably alkaline earth salt of lignosulfonate.

Abstract: Starch derivatives have been found to be effective water loss control additives in clay-free wellbore fluids. Generally the starch derivatives are starch ethers, starch esters and partially oxidized starch. The starch derivatives can be added to the wellbore fluid in either the gelatinized or ungelatinized form. Unlike ordinary unmodified starch, the starch derivatives are soluble in acids, stable in the presence of calcium chloride, do not undergo retrogradation and are stable at higher temperatures than unmodified starch.

Abstract: A clay-free, i.e., non-argillaceous wellbore fluid, having unstructured viscosity is obtained by combining water with an additive composition comprising hydroxy alkyl guar gum and at least 10 weight percent of magnesia or magnesium hydroxide based on the weight of hydroxy alkyl guar gum.

Abstract: Starch derivatives have been found to be effective water loss control additives in clay-free wellbore fluids. Generally the starch derivatives are starch ethers, starch esters and partially oxidized starch. The starch derivatives can be added to the wellbore fluid in either the gelatinized or ungelatinized form. Unlike ordinary unmodified starch, the starch derivatives are soluble in acids, stable in the presence of calcium chloride, do not undergo retrogradation and are stable at higher temperatures than unmodified starch.

Abstract: Starch derivatives have been found to be effective water loss control additives in clay-free wellbore fluids. Generally the starch derivatives are starch ethers, starch esters and partially oxidized starch. The starch derivatives can be added to the wellbore fluid in either the gelatinized or ungelatinized form. Unlike ordinary unmodified starch, the starch derivatives are soluble in acids, stable in the presence of calcium chloride, do not undergo retrogradation and are stable at higher temperatures than unmodified starch.

Abstract: The additives are employed in non-clay wellbore fluids, as for example, in clear water, brines or emulsions used for drilling, well completion, workover, fracturing, and such stimulation operations as diverting injected flood fluids and acids or solvents. The basic additive may be a single organic material added primarily as a hydroxyalkyl cellulose viscosifier, hydroxyethyl cellulose (HEC) for example, stabilized with magnesia.Other conventional additives include natural gums, artificial gums, cellulose derivatives such as polyanionic cellulose polymers and anionic heteropolysaccharides, and pseudoplasticity-imparting gums and polymers such as hydrolyzed polyamides, lignosulfonate salts, same being used primarily for control of either viscosity or fluid loss, although such may have some controlling effect on both quantities.In general the magnesia stabilizer causes the viscosifier basic additive to act more quickly in absorbing water to thicken the wellbore fluid.