The amount of solvent used in the process of the invention should be sufficient to dissolve an appreciable amount of the reactants and to maintain the copolymer precipitate in a stirrable state at the end of the polymerization. The test samples showed a slight thickening on standing. A composition according to claim 1 having a Gardner viscosity of about to 50, cps. Process for the production of highly water-absorbing but less water-soluble hydrogels. Add to Wish List. Gives directions to oil-well-service-operator helper to unload pipes, fittings, and chemicals, and to correct pipes between pumps and well, using handtools. A high-temperature high-pressure hthp stable synthetic polymer for water based oil-well servicing fluids. 
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There's a problem loading this menu right now. Explore our most popular jobs. Download Free White Papers. By placing your order, you agree to our Terms of Use. The effect of such subsurface feeding of monomer-crosslinker solution was to reduce build-up of viscosity of the polymer product during the polymerization, resulting in a smoother course for the process, particularly with acidizsr to effective stirring of the reaction mixture.
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As shown in Table IV, aqueous acid compositions containing three different crosslinked PVP thickeners were evaluated for acid stability at various temperatures for 24 hours. Brendon Urie of Pan Please try your search again.
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This polymer preferably is prepared by precipitation polymerization in an organic solvent, in the presence of about 0. Amazon Advertising Find, attract, and engage customers.
Write a customer review. In the crosslinked polymer system of this invention, an effective thickener product is provided by including crosslinker in the reaction mixture at a suitable concentration of about 0.
A composition according to claim 1 in which said PVP polymer is crosslinked with N,N'-divinylimidazolidone, pentaerythritol triallyl ether, triallyl-1,3,5-triazine-2,4,5 1H,3H,5H -trione or 2,4,6-triallyloxy-1,3,5-triazine.
A composition according to claim 1 having a Gardner viscosity of about to 50, cps. While the invention has been described with particular reference to certain embodiments thereof, it will be understood that changes and modifications may be made which are within the skill of the art.
USA - Gelled acidizer composition - Google Patents
A stirring rate of about rpm in a 1-liter lab reactor is quite adequate to effect the desired polymerization and to keep the precipitate in a stirrable state during the polymerization. Amazon Inspire Digital Educational Resources. Most of the country is located contiguously in North A gelled acid composition which comprises: Amazon Drive Cloud storage from Amazon.
See our salary, cost-of-living, and executive pay applications in action. Go Unlimited Start your day free trial. The heterogeneous polymerization process of the invention in cyclohexane or heptane solvent provides the desired PVP polymer product as a fine, white powder, which precipitates readily, in quantitative yield, with substantially the same degree of crosslinking as the charge of VP monomer and crosslinking agent, in a smooth polymerization without excessive swelling of polymer during the course of the process.
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The reaction mixture should be stirred vigorously under an inert atmosphere, e. ERI Economic Research Institute compiles the best salary, cost-of-living, and executive compensation survey data available.
Observes meters and pressure gauges to adidizer quantity and consistency of materials and to control pump pressure. For maximum utility, it is desirable that the hydrated polymer exhibit a high gel volume and a high viscosity. Method for producing synthetic polymerizates with a very low residual monomer content, products produced according to this method and the use thereof.
Polyacrylamide-based acid gelling agents fail in this respect because they produce formation-damaging precipitates. Skip to main content.
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Amazon Rapids Fun stories for kids on the go. Still another object is to provide such compositions which are useful over a wide acid concentration range, and wide temperature range, and which provides a high viscosity at relatively low concentrations of the gelling agent.
The results show effective acid stability at high temperatures for each of these compositions over a prolonged period of time. However, it is necessary, and often lacking, in such acid gelling agents, to maintain a stable, high viscosity for controlling acid fluid leak-off to the formation and retardation of the acid reaction rate with the acid-soluble formation.
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