Acidizing blocking remover, preparation method thereof and blockage removing method applying the same

Abstract

Relating to the field of oilfield development, the invention discloses an acidizing blocking remover, a preparation method thereof and a blockage removing method applying the same. The acidizing blocking remover comprises a component A, a component B, a component C and a component D. Specifically, the component A includes hydrochloric acid, xylene and water; the component B includes a mud acid / organic acid system; the component C includes additives, a composition capable of producing hydrofluoric acid and water; and the component D includes hydrochloric acid and water. The construction processincludes: step 1: injecting a pre-flushing liquid with a mass concentration of 2-5% into a water injection well; step 2: squeezing the component A into the stratum at a displacement of 1-1.5 cubic meter / min; step 3: reducing the displacement, and squeezing the component B into the stratum at a displacement of 1-1.2 cubic meter / min; step 4: squeezing the component C into the stratum at a displacement of 1-1.5 cubic meter / min; and step 5: adding the component D into the well. Combination of the whole components can achieve a good treatment effect on mixed plugging of old wells, and the acidizing blocking remover is suitable for wells with a deep blocking section, a large blockage removing radius and a large blocking remover dosage.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to an acidizing plugging-removing agent, a preparation method thereof and a plugging-removing method using the acidizing plugging-removing agent. Background technique [0002] With the progress of oilfield exploration and development, various measures such as drilling, cementing, well completion, fracturing, and water injection may cause damage to the oil layer, thus leading to blockage of the oil layer. When the oil layer is clogged, it will lead to the failure of water injection and oil production, which will eventually lead to a great waste of oil and gas resources. Therefore, the protection of oil and gas reservoirs has attracted more and more attention from all walks of life, and has become an important research content in the process of oil and gas development. [0003] There are two main reasons for oil well plugging. One is the mud pollution near the wellbore ...

AI Technical Summary

Problems solved by technology

However, this acidifier has low dissolution ability to cuttings minerals, and has little ability to dissolve inorganic salt precipitation with low solubility in water.

[0007] Based on the above-mentioned technical defects, it is necessary to further develop a new combination of acid solutions to improve the problems of fast reaction speed, short action distance and poor plugging effect of existing acid solutions.

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