Deep fluid diversion method

Abstract

The invention provides a deep fluid diversion method, which belongs to the field of petroleum extraction. By the method, a thermodynamics condition and a dynamic condition of a reaction are changed by adjusting the content of precipitated ions in injected water or / and adding an anti-scale agent with a certain concentration, so that the process of a precipitation reaction in stratum porous media can be effectively controlled, precipitates can be generated in a presumptive area on the deep part of a stratum, and the aim of deep profile control of fluid diversion can be fulfilled. By the method, the limitation that an inorganic precipitation plugging agent can only be used for profile control over water plugging in a near well is eliminated, and the application range of the inorganic precipitation plugging agent is expanded; the method has an important significance for improving water drive effects of high-water-cut reservoirs and particularly improving the water drive effects of high-temperature and high-salinity reservoirs, is suitable for various water injection reservoirs, and is easy to operate; and during operation implementation, a common water injection process can be kept unchanged by only adjusting ingredients of the injected water, and high efficiency and long-acting effects can be ensured at the same time.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a deep liquid flow diversion method, which is used for the liquid flow diversion in the deep part of inorganic precipitation. Background technique [0002] Water plugging and profile control of oil-water wells is one of the important technical means to control water, stabilize oil and improve water flooding in severely heterogeneous reservoirs. Its research and application began in my country in the late 1950s, and has been improving for decades. Waterflooding plays an important role in the development effect of various heterogeneous reservoirs. At present, my country's water flooding oilfields generally enter the high water-cut or ultra-high water-cut production period. Long-term water injection scours lead to the formation of large pores and channeling, and the injection water is seriously inefficient. Water or high-dose treatment technology can no lon...

AI Technical Summary

Problems solved by technology

However, it is generally believed that the inorganic precipitation reaction is an ionic reaction, the reaction speed is fast, and it is difficult to control. The depth of the inorganic precipitation plugging agent entering the formation is limited and it is not suitable for deep treatment. It is also very difficult to inject system formulations

Therefore, the reported inorganic precipitation plugging agents used in mines are mainly silicate precipitation plugging agents produced by the reaction of water glass and divalent ions such as calcium and magnesium. Most of the plugging agents are used for near-well profile control and water plugging Inorganic precipitates such as BaSO4, CaSO4, and CaCO3, which are easy to form during water injection, are used as plugging agents for profile control and water plugging only at the conceptual stage, and neither experimental research nor field application has been reported.

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