Acidizing plugging remover for removing oilfield pollution plugging

Abstract

The invention discloses an acidification blocking remover for removing oil field pollution blocking. The acidification blocking remover consists of the following components in percentage by weight: 6-10% of H5R, 3-7% of NH4HF2, 0.5-1.5% of retarding agent, 0.5-1.5% of corrosion inhibitor, 0.5-1.5% of iron ion stabilizer, 1-3% of clay stabilizer and the balance of water, wherein R is a phosphonate radical group. The acidification blocking remover disclosed by the invention can go deep into an oil layer to remove blocking, the acidification distance is relatively long, the effect is much better than that of traditional acidification using hydrochloric acid and mud acid, and the acidification blocking remover is particularly applicable to a sandstone reservoir with loose cement and structure.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, and relates to an acidizing and plugging-removing agent for removing oilfield pollution and plugging. Background technique [0002] In the process of oil field development, the oil layer often occurs pollution and blockage, which affects the normal development of the oil field. In order to ensure the normal production of the oil field, restore or increase the permeability of the formation, and realize the increase and stability of the oil well, the pollution blockage of the oil layer must be removed. Unblock the oil layer, improve the seepage capacity of the oil layer, and improve the development effect of the oil reservoir. [0003] The traditional plugging removal technology relies on acidizing the formation, and the most commonly used ones are mainly hydrochloric acid and earth acid (a mixture of hydrochloric acid and hydrofluoric acid). Both hydrochloric acid and earth acid are s...

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Problems solved by technology

[0003] The traditional plugging removal technology relies on acidizing the formation, and the most commonly used ones are mainly hydrochloric acid and earth acid (a mixture of hydrochloric acid and hydrofluoric acid). Both hydrochloric acid and earth acid are strong acids, which can quickly dissolve and consume oil reservoir rocks. , but the acidizing effect can only be good in the area near the wellbore, and the acidizing distance is very small. It can only remove the pollution in the area near the wellbore, but not the oil layer pollution and blockage in the far away area, and the acidizing effect is poor

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