Composite blocking remover for oil well and application method thereof

Abstract

The invention relates to a composite blocking remover for oil well and an application method thereof. The composite blocking remover comprises two ingredients of A and B in a ratio of 1:5-8; the ingredient A comprises, by weight, 20-50 parts of chlorine dioxide maternal, 1-4 parts of heat-resistant agent, 10-20 parts of organic clay stabilizer, 5-10 parts of chlorine dioxide synergist and 5-10 parts of inorganic salt; and the ingredient B comprises, by weight, 30-60 parts of hydrophosphate, 2-6 parts of corrosion inhibitor, 1-5 parts of iron ion complexing agent, 5-12 parts of de-emulsifier, 4-12 parts of osmotic agent and 60-180 parts of water. The application method comprises steps that the ingredient A and the ingredient B are measured according to a formula and mixed with water; and the mixed liquor is injected into an oil well immediately. According to the invention, construction inconvenience and potential safety hazard caused by surface activation can be avoided, and construction frequency is reduced, so as to raise blocking removal effects by times.

Description

technical field [0001] The invention relates to a compound plugging remover for oil wells, belonging to the technical field of oilfield chemical additives. Background technique [0002] Oil wells mainly use strong acids such as earth acid and hydrochloric acid for acidification and plugging removal, but they can only remove most of the inorganic substances that block the bottom layer, and have no obvious effect on bacteria, polymers, etc.; or use quaternary ammonium salts , aldehyde, and ketone non-oxidizing fungicides for sterilization, but the action time of non-oxidizing fungicides is slow, and it is easy to make bacteria resistant, so the effect is not obvious. [0003] Chlorine dioxide compound plugging removal technology uses the strong oxidizing property of chlorine dioxide to remove blockage of organic polymers in fracturing fluid and drilling fluid, kill bacteria, dissolve iron scale, etc.; use its compound acid to remove most of the inorganic clogging of things. ...

AI Technical Summary

Problems solved by technology

Although the chlorine dioxide plugging remover has been applied in a small range and has achieved certain effects, since the chlorine dioxide plugging remover used in the oilfield plugging removal is used after adding acid to the stable chlorine dioxide solution, if it is directly After activation on the ground, it is injected into the bottom of the well. Because the concentration is too high and the smell is too choking, it will cause certain harm to the ground staff. If the concentration of chlorine dioxide is too high, it will cause corrosion of the well pipe and may cause an explosion if the concentration of chlorine dioxide is too high. The chlorine concentration is too low, there is 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 for oil well deblocking. The dosage of chlorine dioxide is very small. Large, high cost, so the chlorine dioxide compound plugging removal technology has not been able to achieve large-scale application