Separated injection oil well composite blocking remover and injection method thereof

Abstract

The invention relates to a separated injection oil well composite blocking remover and an injection method thereof. The separated injection oil well composite blocking remover comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1: 1; the component A comprises the following raw materials of: by weight, 50-90 parts of hydrochloric acid, 20-50 parts of hydrofluoric acid, 15-35 parts of acetic acid, 4-10 part of a corrosion inhibitor, 2-6 parts of an iron ion complexing agent and 2-8 parts of an osmotic agent; and the component B comprises the following raw materials of: by weight, 5-10 parts of chlorine dioxide matrix, 10-30 parts of a clay stabilizer, 1-5 parts of a chlorine dioxide synergist and 5-10 parts of inorganic salt. The injection method provided by the invention comprises the steps of respectively diluting the component A and the component B into injection water and carrying out separated injection by isolation water circulation. According to the invention, construction troubles and security hidden troubles caused by well activation can be avoided, and chlorine dioxide can be effective at a low concentration. In addition, oil well plug removal of inorganic substance and organic matter can be accomplished at a time so as to save the construction number.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemical additives, and in particular relates to a segmented injection type oil well composite plugging remover and an injection method thereof. 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. Reservoir blockages can be divided into two categories: inorganic matter and organic matter. The traditional "acidification plugging removal" process has different degrees of dissolution ...

AI Technical Summary

Problems solved by technology

If the chlorine dioxide preparation is directly injected into the bottom of the well after being activated on the ground, the concentration is too high and the smell is too strong, which will cause certain harm to the ground workers. If the concentration of chlorine dioxide is too low, there will be no possibility of explosion, and the operation is very safe, but the effect is not obvious. There is also a technology of injecting raw materials into the bottom of the well to generate chlorine dioxide at the bottom of the well for unblocking oil wells. The dosage of chlorine oxide is large and the cost is high, so the chlorine dioxide compound plugging removal technology has not been able to achieve large-scale application