Oil well acidification blockage removal equipment

Abstract

The invention relates to the technical field of oil well equipment and discloses an oil well acidification blockage removing device. The device comprises a shaft, wherein a front shell is movably installed in the shaft, an acid storage cavity is formed at the front end of the front shell, a bottom plate is movably installed at the bottom of the acid storage cavity, a connecting pipe is movably installed on the bottom plate, a water pump is fixedly installed in the middle of the connecting pipe, and the other end of the connecting pipe is fixedly connected to a connecting piece. According to the oil well acidification unblocking equipment, the acid storage cavity is formed at the front end of the shaft; the acid storage cavity is connected with a connecting shell through a water pump and aconnecting pipe; the bottom of the connecting shell is movably mounted at the upper part of an acid outlet, acid liquor is conveniently driven to be sprayed out of the through hole of the acid outletwhile a conveying cavity rotates, acidolysis treatment is conducted on blockages, a rotating impeller is installed at the front end of the rotating shaft, the acid liquor and liquid around the blockages are conveniently mixed through the rotating impeller, and better reaction between the acid liquor and the blockages is facilitated.

Description

technical field [0001] The invention relates to the technical field of oil well equipment, in particular to oil well acidizing and plugging removal equipment. Background technique [0002] At present, with the continuous development of oilfields, production well reservoirs will be blocked to varying degrees due to various reasons. Conventional plugging removal methods include acidification, deflagration fracturing, fracturing, etc. First, it is easy to cause artificial fractures to communicate with natural fractures and cause water channeling, so that the production wells can see water quickly; second, the stimulation action point cannot be accurately controlled, and it is difficult to achieve selective or uniform plugging removal. Retrofitting is relatively difficult, and the method of acidizing and plugging removal is generally adopted. The acidizing and plugging removal technology is an effective measure to decontaminate the oil and gas reservoirs near the wellbore and re...

AI Technical Summary

Problems solved by technology

[0002] At present, with the continuous development of oilfields, production well reservoirs will be blocked to varying degrees due to various reasons. Conventional plugging removal methods include acidification, deflagration fracturing, fracturing, etc. First, it is easy to cause artificial fractures to communicate with natural fractures and cause water channeling, so that the production wells can see water quickly; second, the stimulation action point cannot be accurately controlled, and it is difficult to achieve selective or uniform plugging removal. Retrofitting is relatively difficult, and the method of acidizing and plugging removal is generally adopted. The acidizing and plugging removal technology is an effective measure to decontaminate the oil and gas reservoirs near the wellbore and restore the productivity of oil and gas wells. It is an effective measure to restore the productivity of oil and gas wells. During the "Ninth Five-Year Plan" period, through a large number of laboratory experiments and field practices, a series of acidizing and plugging removal technologies suitable for different reservoir types and different plugging characteristics of Jidong Oilfield were formed.

[0003] At present, when the oil-water wells are injected into the oil-water well to remove plugging by acidification, hydrochloric acid is usually used as the spacer fluid first, and then an organic plugging-removing agent is used for plugging. When this method is used, the spacer fluid is injected unevenly, and the inside of the oil-water well cannot be evenly sprayed. Hydrochloric acid, which will pollute the nearby soil and destroy the ecological environment when using organic plugging remover. At the same time, when the inside of the oil and water well needs to be injected with hydrochloric acid, the amount of hydrochloric acid used is too large, causing unnecessary waste. At the same time, the organic plugging remover The injection is not uniform enough, which affects the effect of plugging removal, and after the plugging removal construction is completed, some blockages will not be carried out of the wellbore, and will re-enter the formation with the recovery of water injection, causing the formation to be blocked again, resulting in weakened construction effect

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