Alkaline blocking remover, preparation method thereof and alkaline blocking removal method in near-oil-well zone

Abstract

The invention relates to the field of oil well blocking removal, and particularly discloses an alkaline blocking remover and a preparation method thereof, and an alkaline blocking removal method in an area near an oil well. The alkaline blocking remover comprises alkaline earth metal hydroxide, an oil displacement surfactant, a clay stabilizer, an iron ion stabilizer, a crude oil demulsifier, a discharge aiding agent and water. The invention relates to a preparation method of the alkaline blocking remover, which comprises the following steps: sequentially adding and dissolving the alkaline earth metal hydroxide, the oil displacement surfactant, the clay stabilizer, the iron ion stabilizer, the crude oil demulsifier and the discharge aiding agent into water to prepare the alkaline blocking remover. The alkaline blocking removal method for the near-oil-well zone comprises the following steps that S1, injecting the alkaline blocking remover into an oil well; and S2, adopting the alkaline blocking remover to corrode the oil well blockage, and after corrosion of the oil well blockage is completed, carrying out flowback. The alkaline blocking remover does not change a rock structure during unblocking, sand production is not increased after unblocking, and the problems that the near wellbore area of an oil layer is blocked and sand production is serious after unblocking can be solved.

Description

technical field [0001] The present application relates to the field of plugging removal of oil wells, more specifically, it relates to an alkaline plugging removal agent and a preparation method thereof, and an alkaline plugging removal method near oil wells. Background technique [0002] In the process of oilfield development and production, damage and blockage occur in the near-well zone of the oil layer, which seriously affects the production of the oil well, and even makes the oil well produce no oil. The plugging removal measures applied in the oil layer near the wellbore are basically classified into two categories: physical vibration method and chemical method. The physical vibration method utilizes the effect of vibration waves to excite the medium in the vibration field, and realizes oil layer plugging removal through denudation, disintegration, reduction of capillary force, and removal of the "Jiamin effect"; chemical method uses acidic plugging agent to dissolve, ...

AI Technical Summary

Problems solved by technology

[0004] However, in the actual plugging removal process, after chemical plugging removal or combined chemical and physical vibration methods are used to remove plugging, some oil wells will produce sand due to acidification. It drives up the production cost, and in extreme cases, the well wall collapses and the oil well is scrapped, which brings huge losses to the oil field

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