Injection process for polymer solution with special seepage characteristic

Abstract

This invention relates to a polymer solution with a special seepage property and its preparation method characterizing in including the following components matched in mass percentage: partial hydrolyzed PAA: 0.05-0.15%, mineralization regulator: 0.02-0.5% and rest is water.

Description

Technical field: [0001] The invention relates to an auxiliary agent for oil flooding in an oil field, which is mainly used for polymer flooding in medium and low permeability sandstone reservoirs, in particular to a polymer solution with special seepage characteristics and a preparation method thereof. Background technique: [0002] At present, the eastern oilfields in China have entered the middle and late stage of ultra-high water cut development, and the task of "controlling water and stabilizing oil" is very arduous. In recent years, through the application of polymer flooding technology, the trend of excessively fast rise of oilfield comprehensive water cut has been effectively suppressed, the decline rate of crude oil production has been significantly reduced, and good economic and social benefits have been achieved. With the continuous expansion of the application scale of polymer flooding technology in oil fields, the number of remaining main oil layers that can be u...

AI Technical Summary

Problems solved by technology

Since polymer flooding in low-permeability reservoirs is still in the exploration and test stage, the amount of polymer used is small, and 500×10 4 ~1000×10 4 The cost of polymer is higher, and the direct use of 1500×10 4 ~3500×10 4 The polymer will block the pores again, making injection difficult

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