Using method of water injection well chemical scale inhibition and removing device

Abstract

The invention relates to a using method of a water injection well chemical scale inhibition and removing device. According to the technical scheme, the using method comprises the following steps that(1), the chemical scale inhibition and removing device is assembled; (2), when oilfield reinjection water is injected through a water injection string from a well head, the chemical scale inhibition and removing device is in a work waiting state; and (3), after scale occurs to a water nozzle of an eccentric water distributor, hydrochloric acid is controlled to be pushed out by a floating piston tobe dispersed to the scaled water nozzle and the scaled positions of a sleeve and the water injection string, and thus the scale is subjected to chemical reaction continuously to be dissolved. The using method has the beneficial effects that in this way, scale inhibition can be achieved through the small amount of hydrochloric acid, and whole injected liquid does not need to be acidized; and additionally, the scale inhibition effect of the eccentric water distributor is good, thus the working time can be prolonged, frequent well stopping for work due to the scaling problem is avoided, and thework cost is lowered greatly.

Description

technical field [0001] The invention relates to a water injection well descaling device and method, in particular to a method for using a water injection well chemical anti-scaling and descaling device. Background technique [0002] In the process of oilfield development, water is injected into the reservoir through special water injection wells to maintain or restore the pressure of the reservoir, so that the reservoir has a strong driving force, so as to increase the production speed and recovery rate of the reservoir. However, at present, the liquid injected into the formation through water injection wells is generally oilfield produced water, which contains relatively high calcium ions and magnesium ions. With the injection of water, due to the increase of temperature and pressure, the temperature rises to 100 degrees, and carbonic acid gradually forms Calcium, magnesium carbonate, and then deposited in the inner cavity of the water injection column and the faucet of the...

AI Technical Summary

Problems solved by technology

However, the existing problems are: first, the entire water injection pipe is full of hydrogen ions, which is easy to oxidize and corrode the water injection pipe string; second, the acidification volume of water injection wells is increasing, and repeated acidification wells are increasing year by year, but the injection effect is getting worse and worse , the effective period of acidification is getting shorter and shorter

The third is that the formation fluids are all acidified, so that the oil produced in the later stage has a higher acid content, which will affect the refining equipment in the later stage and increase the cost of refining

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