New continuous production stabilization and efficient interactive blockage removal method for high water later oil reservoir of oil field
2011
The invention provides a new continuous production stabilization and efficient interactive blockage removal method for the high water later oil reservoirs of an oil field. The method comprises the following steps of (1) backwashing a well for two days, and filling clear water in the wellhole; (2) calculating and preparing a corresponding amount of acid-resistant and oil soluble temporary plugging agent before the well is backwashed completely; (3) squeezing the temporary plugging agent from a sleeve, and replacing the temporary plugging agent by clear water until the temporary plugging agent enters the strata completely; (4) closing the well and waiting on cement for one day; and (5) continuously removing the blockages in an acidizing manner by adopting the conventional blockage removal technology. The problem that the tar productivity of high water oil well is not high by the conventional acidic blockage removal technology is solved; the temporary plugging agent is used for blocking a high-permeability layer; the pollution to a low permeability layer is relieved; the low permeability layer is released; and the high permeability layer is not polluted; the blockage removal is interacted, so that the aim of improving the tar productivity is finally fulfilled, and technical assurance is provided for stabilizing production of high water oil fields.
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