Hydraulic jet casing descaling device and process method for applying hydraulic jet casing descaling device

Abstract

The invention belongs to the technical field of casing descaling in oil and water wells, and particularly relates to a hydraulic jet casing descaling device and a process method for applying the hydraulic jet casing descaling device. The hydraulic jet casing descaling device comprises a sand pot, a sand mixing truck, a pump truck, a liquid supplying pump, a water tank and a spraying gun; the liquid supplying pump conveys water in the water tank into the sand mixing truck, quartz sand from the sand pot and water are mixed by the sand mixing truck and then conveyed to the pump truck, the spraying gun is down to a downhole through an oil tube, water mixed with the quartz sand is pressurized by the pump truck through the oil tube and is conveyed to the spraying gun, high-pressure water is jet through a spraying nozzle on the spraying gun to form high-speed jet, so that scales on a well wall are broken and separated from a casing wall, the water sprayed from the spraying nozzle returns back to the water tank from a wellhead. According to the hydraulic jet casing descaling device and the process method for applying the hydraulic jet casing descaling device, a spiral spraying nozzle distribution method is adopted, descaling without dead angles is ensured, meanwhile, descaling is complete, the efficiency is high, crushing, cleaning and scraping are completed once, meanwhile, dirt in a shot hole can be effectively cleaned, a seepage channel is improved, and the descaling effect is excellent through field application.

Description

technical field [0001] The invention belongs to the technical field of oil-water well casing descaling, and in particular relates to a hydraulic jet casing descaling device and a process method using the device. Background technique [0002] ASP flooding technology is a commonly used oil displacement technology in oilfield production. During the application of this technology, the problem of casing fouling will occur. After the ASP flooding system is injected into the formation, it breaks the ion balance of the formation, and undergoes complex chemical reactions with formation fluids and rocks. Due to changes in temperature, pressure, ion composition and other factors, inorganic salts deposit in the wellbore. Severe fouling occurs. The main components of scale are composed of non-crystalline silica scale, silicate scale and carbonate scale. The scale is dense, hard and difficult to remove. Scaling in the oil well will damage the production layer, reduce the oil recovery ra...

AI Technical Summary

Problems solved by technology

Chemical descaling uses chemicals to dissolve the scale on the inner wall of the casing. The disadvantage of this method is that it will not only produce new deposits and new scale, but also cause different degrees of environmental pollution.

Mechanical descaling is to use turbo drills to mill scales. The disadvantages of this method are: slow descaling speed and low efficiency; the torque of the turbo drill will damage the thread of the oil pipe; Secondary grinding and milling, the operation cost is relatively high; it will have a certain blocking effect on the blast hole, which will affect the liquid output

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