Compound acid solution blocking remover for oilfield clogging

Abstract

The present invention discloses a compound acid solution blocking remover for oilfield clogging. The blocking remover comprises the following components by weight: 10-15% of hydrochloric acid, 8-12% of succinic acid, 2-5% of a stabilizer, 0.3-0.8% of a corrosion inhibitor, 0.5-1% of an additive and 70-80% of water. The product provided by the invention is a composite acid compounded from a plurality of organic and inorganic acids, corrosion inhibitor, stabilizer, and additives through the scientific process conditions, has the characteristics of chemical stability, high dissolution rate, low damage and corrosion resistance, can effectively relieve the blockage and damage caused by inorganic and organic matters in the formation, increase the permeability of the formation and reach the effect of increasing yield and injection of oil wells.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a composite acid plugging remover for oilfield plugging. Background technique [0002] During the production process of the oil well in the oil field production system, due to various reasons in the production process, the oil layer will be blocked, the permeability will decrease, and the production will decrease. With the development of the oil field, the reservoir has been damaged to varying degrees. In the early stage of development, inorganic plugging is the main problem. Conventional acidification plugging removal technology is used to improve the permeability of the reservoir and remove the plugging caused by inorganic substances, and good results have been achieved. With the continuous development of the oilfield, the injection water increases, the formation pressure and temperature decrease, and the phenomenon of cold damage to the reservoir becomes more and ...

AI Technical Summary

Problems solved by technology

However, the traditional "acidification plugging removal" in oilfields has poor plugging removal effect on this kind of high molecular polymer plugging.

In order to improve plugging removal efficiency, blindly increase the amount of acid, resulting in a small treatment radius, severe acid corrosion near the wellbore area, after acidizing operations, due to serious damage to the rock skeleton near the wellbore area, loss of balance, easy to cause sand production, damage to oil well equipment , pipelines, pumps, etc. are severely corroded, and may even cause formation deficiencies near the wellbore, casing deformation or failure

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