| With the prices of petroleum products rose step by step, using water injection to develop oil fields in the world became a hot spot once again. At present, even after the development of water was only 25% to 35% of crude oil on the ground floor, and the mining method has been still used by most of the countries. Because there was still oil in a large number of unused reservoir, or to use less oil exists. With the continued development of long-term oil field water injection into the middle and late stages of development, the rise aquifers appears integrated oil fields, oil field exploitation of the benefits would be worse year by year. Most of the countries through let the operation well of some of the levels block in a short-term temporary so as to the aim of the floor for the exploitation of crude oil enhance crude oil recovery. The research on temporary blocking agent oil has not stopped. The oil operations will be combined with environmental protection, not only developed a temporary closure on the project to meet the needs of the pollution is not geology, but in different conditions, the degradation of the material can be time-conditioned environment-friendly biodegradable oil production temporarily blocked Agent for the re-development of oil fields and enhanced oil recovery is of great significance.The skeleton support for the starch material, acrylic acid (sodium), acrylamide as a graft copolymer material has been studied through expansion of the water-absorbent polymer of a large number of experiments to study, and the experiment has been adopted by the graft copolymer of performance theory and expressions of good fit to investigated the mechanism of the reaction. In the experiment, the research has been mainly concentrated on the relationship between the main starch concentration, initiator concentration, the crosslinker concentration, reaction time, reaction temperature, solution pH value, temperature drying acrylic acid, acrylamide concentration and reaction temperature and the reaction rate. The degradation of the polymer degradation time has been studied through adding additives to different polymer materials. Adding to the polymer different inorganic mineral its polymer gel strength and degradation time have been examined. In additionally, the reaction copolymerization of acrylamide certain conditions have been optimized through comparison of the experimental starch-g-acrylic acid (sodium), and the technology have been tried in the second graft starch and acrylic acid (sodium), the second graft Copolymerization. Finally a new type of water-absorbent polymer-based expansion of the temporary blocking agent has been acquired, and the technical indicators have gotten as follows:Gelatin time in 1 hour to 10 hours was adjustable; There was a certain degree of anti-temperature, pressure gel strength was greater than 4MPa, settling time was greater than 2 days; The self-degradation time between 3 days and 15 days was adjustable; After the break plastic apparent viscosity was AV<30mPas.There was good water-soluble, temporary blocking higher rate of temporary blocking strength of a larger, better protection, cost-effective, with a wider scope of application in new temporary blocking agent. Not only from a practical point of view of the Earth environmental protection, but also the use of renewable resources inexhaustible supply of starch academic point of view, this blocking agent are of great significance.
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