Oil well chemical gorge and disgorge yield increasing and inverse direction regulating block connection working process

Abstract

The invention relates to a technique combining the chemical huff and puff stimulation and the reversed plugging control. The technique adopts slug-type injection mode, including active agent slug, water plugging profile modification agent slug an displacement fluid slug, and includes the following steps: (1) firstly, injecting the active agent into the oil production layer, (2) injecting the water plugging profile modification agent 0-20 hours later, (3) then using excessive displacement fluid to lift all chemical agents to a place which is more than 3m away from well bore, and then using water to displace the excessive displacement fluid to the stratum and finally closing the well for 1 to 2 days for condensation. The purpose of the technique is to combine the huff and puff of the active agent with high oil-washing efficiency and low interfacial tension and the reversed profile control and flooding of the oil well, thus not only increasing the conformance factor of the injection of the water but also improving the oil displacement efficiency and extending the life circle.

Description

Technical field: [0001] The invention relates to a method for increasing the recovery rate of an oil well in the field of oil recovery, in particular to an oil well chemical huff and puff increase production and reverse plugging regulation combined operation process. Background technique: [0002] In low-permeability and fractured oilfields, not only the reservoir physical properties are poor, but the formation energy is insufficient. In the later stage of oilfield water injection development, due to the serious heterogeneity of the oil layer, when the oil layer has high water content, there is still part of the thickness in the layer that has not been washed by water; the water wash in the layer is uneven, and generally Segmented water washing occurs; there is a strong water washing section in the layer, but the thickness is generally thin; the degree of water washing in the lower oil layer is high, especially the regular oil layer; so after water flooding, there is more res...

AI Technical Summary

Problems solved by technology

However, the traditional injection well profile control and oil well water plugging can increase the sweep coefficient of the injected water, but cannot improve the oil washing efficiency of the injected water, and its effect is insufficient in terms of improving the recovery factor.

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