APPLICATION OF NEW LJ SERIES OF COMPOSITE INJECTION INCREASE AGENT IN KERAMAYI OILFIELD

This paper introduces the injection increase mechanism, property and action of new LJ series of composite injection increase agent, introduces the application of them in the underinjected wells in both new and old blocks of Keramayi ollfield and Cainan Oilfield.The injection increase agent had been used for treating the underinjected wells for 57times,and the efficiency was more than 98%. The field application of the agent showed that it had removed the plug of the lnjection layers, satisfied the requirements of the injection allocation. Comparing with the method of fracturing and injection increase, it has the characteristics of removing plug of thicker layers and being suitable for several injection layers at the same time. The LJ series of composite injection increase agent is composed of 2 parts. Thepreconditioning agent LJ-2, which is with good permeableness and dispersion actions;andthe main conditioning agent LJ-3, which can dredge the pores and throats by means of preventing the clay grains from migrating, swelling, and by means of dissolving themicroorganisms’ body and injected particles in the water.