Oil well pipe sleeve scale cleaning method

Abstract

The invention discloses an oil well pipe sleeve scale cleaning method. The oil well pipe sleeve scale cleaning method comprises the following steps: installing and setting a coiled tubing and a high pressure pump; installing a coiled tubing guide rail; installing a wellhead bracket and a wellhead injection head; connecting a ground to the coiled tubing and a Phi 42mm rotating nozzle to test pressure and spraying, wherein the output test pressure of the high pressure pump is 30Mpa, and the spraying test is 35L / min; inputting a Phi 16mm coiled tubing and a Phi 42mm rotary nozzle, starting thehigh pressure pump after the rotary nozzle enters a blowout preventer, pressurizing 15Mpa to test the blowout preventer; continuing to input the coiled tubing and the rotating nozzle, continuing to perform deepening and flushing, and lifting the movable coiled tubing by 5 m after every drilling footage of 10 m, wherein the pump must not be stopped during staying in the well; and continuing to input the coiled tubing to perform flushing after upward movement and dropping of the removed scale in the sleeve are stable is stable. The oil well pipe sleeve scale cleaning method is suitable for sleeve descaling of producing wells in water flooding, ternary composite flooding, polymer flooding and other oil field production manners, and has an obvious descaling effect.

Description

technical field [0001] The invention relates to the technical field of petroleum equipment, in particular to a method for cleaning fouling of oil well casings. Background technique [0002] With the development of tertiary oil recovery, the ASP and polymer flooding methods are gradually popularized. The fouling phenomenon of oil wells in this oil recovery method is becoming more and more serious. The scaling on the casing wall and the inner and outer walls of the tubing is very serious, which seriously affects the normal production of the oil field. At present, there is no effective method for casing descaling. Generally speaking, the more conventional method is to use chemical agents or mechanical grinding. [0003] For three-element and polymer flooding production wells (oil wells), mechanical grinding and chemical agent methods are generally used for casing wall scaling, but the effect is not good. Mechanical grinding needs to be overhauled, which is costly, time-consumi...

AI Technical Summary

Problems solved by technology

[0003] For three-element and polymer flooding production wells (oil wells), mechanical grinding and chemical agents are generally used for casing wall scaling, and the effect is not good.

Mechanical grinding needs to be overhauled, which is costly, time-consuming, and inefficient. The well site occupies a large area and needs to be equipped with a large pool. It can be worn through, causing casing change and affecting oil field production

Chemical descaling, incomplete, takes a long time, pollutes the formation, damages the casing, and affects the normal production of the oil field

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