New continuous production stabilization and efficient interactive blockage removal method for high water later oil reservoir of oil field

Abstract

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.

Description

technical field [0001] The invention relates to an acidizing plug-removing technology in the field of oil recovery. Background technique [0002] At present, many oilfields in China have entered the medium and high water cut period one after another, but the underground recoverable reserves are still relatively large. Due to the high seepage resistance, high energy consumption, low formation pressure and flowing pressure of low permeability oilfields, the potential for further increase in production pressure difference Small, after the oil well breaks through water, the general liquid production rate and oil production rate will drop significantly, and it is difficult to maintain stable production, which seriously affects the economic benefits of the oil field. For water-producing wells, if measures are not taken in time, some high-yield wells will be transformed into wells with no industrial value, and at the same time, the reservoir structure may be damaged, resulting in s...

AI Technical Summary

Problems solved by technology

[0002] At present, many oilfields in China have successively entered medium and high water cut periods, but the underground recoverable reserves are still relatively large. Due to the high seepage resistance, high energy consumption, low formation pressure and flowing pressure of low permeability oilfields, the potential for further increase in production pressure difference Small, after the oil well breaks through water, the general liquid production and oil production will drop significantly, and it is difficult to maintain stable production, which seriously affects the economic benefits of the oil field

For water-producing wells, if measures are not taken in time, some high-yield wells will be transformed into wells with no industrial value. At the same time, the reservoir structure may be damaged, resulting in sand production in oil wells, increased liquid density and volume, and increased bottom-hole oil pressure. , changed the original oil outlet route; the increase in the amount of injected water also caused different degrees of pollution and clogging in the oil layer, and the problem of pollution and clogging became more and more serious with the prolongation of production time. less effective

The existing technology at home and abroad cannot solve the corresponding field problems well, so it is necessary to study a new type of acid-resistant oil-soluble plugging agent, combined with acidification plugging solution, to form a new plugging removal technology

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