Study On Optimization Of Deep Adjusting

Since our country most of oilfields have come into late stage of development,using water injection have stepped into high-aquifer stage. Retardation crosslinking deep adjusting agent is able to improve the heterogeneity of formation, raise sweep efficiency of polymer driving, and then reach the aim of enhancing oil recovery.The researches should be conducted in the following aspects when it comes to optimization of formula:1the influence of concentration of primary agent to gel time and viscosity.2the influence of concentration of crosslinking agent to gel time and viscosity.3the influence of concentration of stabilizer to gel time and viscosity.4the influence of usage of dominating agent to gel time.5the influence of PH value to gel time.6the measurement of thermal stability.7the measurement of shearing resistance.8the comparison between polymer viscosity and adjusting agent viscosity before geling. following above aspects, we can ascertain formula, and than conduct properties evaluation of retardation crosslinking adjusting agent.The purpose of deep adjusting will be sent to the deep formation with the constant migration of injecting water, so that the changing flow of injected water in the reservoir, the maximum increase the swept volume of the injected water, the blocking agent must meet theto block maintained, able to move ". Therefore, the use of flexible microgel as the optimal solution.Flexible microgel formation after absorbing water, the volume expansion, gathered in the pore throat blockage. But certain working pressure can break through the plugging of the pore throat through a pore throat, elastic deformation does not change, the next two pore throats are again the formation of the block, and so on ad infinitum, until from output production wells to solve the problem of a breakthrough in polymer flooding is not valid.