Novel calcium precipitation-free acidizing blockage remover for horizontal well in ultra-low-permeability oil field and preparation method thereof

Abstract

The invention discloses a novel calcium precipitation-free acidizing blockage remover for a horizontal well in an ultra-low-permeability oil field. The novel calcium precipitation-free acidizing blockage remover is prepared from, by weight, the following raw materials: 1-2 parts of polyoxypropylene glycerol ether, 3-5 parts of glycidol, 10-14 parts of methyl methacrylate, 0.1-0.2 part of a catalyst, 2-3 parts of a corrosion inhibitor, 1-4 parts of a clay stabilizer, 100-130 parts of a mixed acid and 3-5 parts of sodium hypochlorite. The blockage remover also has a good scale inhibition function, and protective film can be formed on the metal surface by adopting epoxy modification, so that metal corrosion is effectively inhibited. In addition, the acidizing blockage remover is free of calcium precipitation, good in treatment effect and high in quality.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a novel calcium-free precipitation acidification plugging remover for horizontal wells in ultra-low permeability oilfields and a preparation method thereof. Background technique [0002] Oil well oil layer pollution is the most common production problem commonly encountered in new and old oil fields. The direct consequence of oil layer pollution will reduce the fluid production of oil wells, and in severe cases it will cause oil wells to stop production, resulting in huge economic losses. Oil layer pollution is the production process of oil fields. Inevitably, acidizing plugging removal is the most commonly used economical and effective method to decontaminate oil reservoirs at home and abroad, and it has been developed for nearly a hundred years. At present, the acidizing plugging remover commonly used in domestic oilfields consists of three slugs of pre-acid, main ...

AI Technical Summary

Problems solved by technology

At present, the acidizing plugging remover commonly used in domestic oilfields consists of three slugs of pre-acid, main acid and post-acid, which need to be configured separately when used in the field. The on-site injection procedure is complicated, and there are several main disadvantages: ①Many slugs , the on-site liquid mixing intensity is high, and there is a certain risk of environmental pollution; ②There are many liquid mixing tanks, which occupy the construction site; ③The construction period is long, the construction is complicated, and the construction cost is high