| This paper developed a high- intensity graft copolymers as deep plugging agent, and conduct the laboratory testing, performance evaluation and field test. The plugging agent is made from starch, acrylamide, crosslinker, control agents into the composition of rubber, gelling time more than 12-17 hours at 80℃, and the strength change little in 6-month. It has a high viscosity, good transport characteristics, injection-selective, anti-shearing and sealing off the intensity with the slug became apparent depth of the superposition effect, after into gel, it formered the rigid skeleton of the natural polymer, another flexible polymer side chain of hardness and softness of the three-dimensional cross-linked macromolecular network copolymer, it has a high elasticity and strength of the materials. And the retention capacity of stratum strong, generated in the formation of new graft polymers can flocculation of clay itself, it can cemente loose quartz sand into a core lead to block in pore and further reduce permeability of the high penetration.layer. Based on the Graft copolymer in combination with the features and blocking technology, optimization of construction and slug design, realize water well deep pluging. Five wells were test in field, through construction of injection pressure and bottom back pressure to control injection flow rate, so that blocking agents have moved into primary and secondary pore of the process operations, with an average injection of high-strength blocking agent 105 m3. after Profile control, the well regions improvement in oil production, integrated water fell by an average 4.1%, accumulation increasing oil 3545 t, and the validity period of pluging more than 12 months...
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