Thickened oil well polymer plugging remover

Abstract

The invention discloses a thickened oil well polymer plugging remover. The plugging remover is prepared from the following materials in percentage by mass: 0.5 to 5.0 percent of gel breaker, 1.0 to 10.0 percent of cleaning agent, 0.1 to 5.0 percent of clay stabilizer, 0.1 to 5.0 percent of iron ion stabilizer, 0.1 to 5.0 percent of surfactant, 0.1 to 5.0 percent of corrosion inhibitor, 0.1 to 5.0 percent of bactericide and the balance of water, wherein the gel breaker is prepared from 30 to 70 percent of gel breaker I and 30 to 70 percent of gel breaker II, the gel breaker I is one or more of ammonium persulfate, sodium thiosulfate, potassium periodate and potassium monopersulfate, and the gel breaker II is one or more of calcium peroxide, potassium peroxodisulfate, sodium periodate and iron sulfide. The thickened oil well polymer plugging remover is suitable for solving the plugging problem caused by a thickened oil well polymer, has a better plugging removal effect than a conventional single oxidizer or single acid liquor, and has the advantages of good plugging removal effect, strong corrosion resistance, long period of validity, safety and the like.

Description

technical field [0001] The invention belongs to the technical field of oil well chemistry, and more specifically relates to a heavy oil oil well polymer plug-removing agent. Background technique [0002] Heavy oil well polymer refers to a class of additives used in the process of oil drilling, production and transportation, water quality treatment and enhanced oil recovery. However, with the continuous increase of polymer injection volume and the prolongation of injection time, heavy oil wells will be blocked. With the long-term accumulation of bottom hole plugs, most polymer injection wells have experienced a sharp increase in injection pressure and a sharp drop in water absorption index of oil layers. And other problems seriously affect the polymer flooding effect. In addition, heavy oil has poor fluidity in reservoirs and well bores, and is easy to wrap with plugs to form oil scale, which further aggravates the pollution near the wellbore and affects the production of he...

AI Technical Summary

Problems solved by technology

However, in actual formations, most heavy oil wells have complicated causes of clogging, and most of the clogs are stable systems composed of high molecular polymers, oil scales, and inorganic scales in different proportions.

Especially for the blockage of heavy oil wells, on the one hand, the blockage and the heavy oil wrap each other, which makes the fluidity of the blockage poor and aggravates the blockage of the heavy oil well; on the other hand, the high viscosity of the heavy oil makes the injection The flow is difficult, the probability of contact with the blockage is greatly reduced, and the difficulty of degrading the blockage is increased, resulting in low efficiency or even ineffectiveness of the commonly used blockage removal measures such as a single strong oxidant

[0005] In addition, the currently commonly used strong oxidant blockage remover products are highly corrosive to pipelines and have poor stability. They are prone to lose activity after long-term storage, and the release rate of active components in the formation is not easy to control. There are certain safety hazards. Colloidal asphaltenes and other organic matter are not effective in removing plugs and are likely to cause secondary damage to the reservoir

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