Preparing of compound organic blocking remover and application of compound organic blocking remover to low-permeability oil field

Abstract

The invention discloses a compound organic blocking remover which is composed of body liquid and protection liquid. The body liquid is composed of organic acid, a surfactant and an anti-scaling agent.The protection liquid is composed of an anticrustator, an anti-swelling agent and water. During preparing and using, all the components are evenly mixed according to the mass percentages of the formula; the compound organic blocking remover is diluted with water and injected and reversely discharged separately in use, so the blocking removal aim can be realized. When the liquid gradually enters ashaft bottom, the temperature gradually rises, and diffusion is intensified; in an oil well, organic matter, bacteria blocking removers and the anti-swelling agent are added to the oil well at the same time in cooperation with the organic blocking remover, and stratum clay swelling and clay fine migration are restrained. The surfactant has a cleaning effect on the oil well; by adding the protection liquid, the corrosion of a solution to devices and pipelines is relieved.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to the preparation and application of a composite organic plugging remover in low-permeability oilfields. 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 ...

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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