Composite acid blockage removing agent for oil well

Abstract

The invention relates to a composite acid blockage removing agent for an oil well. The composite acid blockage removing agent consists of the following materials in parts by weight: 50-90 of hydrochloric acid, 20-50 of hydrofluoric acid, 15-35 of acetic acid, 15-35 of nitric acid, 4-10 of corrosion inhibitor, 2-8 of penetrant, 5-10 of inorganic salt, 12-25 of oxidant and 10-30 of clay stabilizer.The composite acid blockage removing agent for the oil well acid provided by the invention achieves the simultaneous removal of inorganic and organic blockage for the oil well, can clean the oil well, has a good anti-corrosion effect, can reduce the number of times of blockage removing construction and has very broad application prospects.

Description

technical field [0001] The invention relates to an oil well compound acid plugging remover, which belongs to the technical field of oilfield chemical additives. Background technique [0002] The oil extraction industry is a complex system engineering, and keeping the oil and water wells unimpeded is the central link of the oil extraction engineering. In the process of drilling, oil testing, well workover and oil production, drilling fluid, well killing fluid, well flushing fluid, injected water and polymers and other liquids that enter the well will cause damage to the formation, causing blockage of oil and gas production channels, resulting in oil well production reduction or Production stopped and the wells were underfilled. In the process of oil production in oil fields, the acidizing treatment process has been used to unblock the formation near the bottom of the well, expand the original pores and fractures in the formation to improve the permeability of the formation, ...

AI Technical Summary

Problems solved by technology

In the process of drilling, oil testing, well workover and oil production, drilling fluid, well killing fluid, well flushing fluid, injected water and polymers and other liquids that enter the well will cause damage to the formation, causing blockage of oil and gas production channels, resulting in oil well production reduction or Shutdown, underfilling of wells

In the process of oil production in oil fields, the acidizing treatment process has been used to unblock the formation near the bottom of the well, expand the original pores and fractures in the formation to improve the permeability of the formation, thereby increasing the water injection volume of the water well and the recovery factor of the oil well. A large number of practices have proved that acidizing treatment can only solve the damage caused by carbonate scale to water wells and oil well formations, while formation plugging caused by coking of heavy hydrocarbons and polymers, ferrous sulfide and bio-organic matter brought in during oil production is Invalid