A wellhead corrosion inhibitor atomization injection process and device

Abstract

The invention discloses a process and a device for atomizing and injecting wellhead corrosion inhibitors, and belongs to the field of safety technologies for oil and gas wells. The process is characterized by comprising accurately computing the usage of the corrosion inhibitors by the aid of formulas during construction; delivering the required corrosion inhibitors to an annular body by the aid of an anticorrosion centrifugal pump; providing the corrosion inhibitors to four atomizing nozzles under distribution effects of the annular body; atomizing the corrosion inhibitors in oil jacket annular spaces by the aid of the four atomizing nozzles under the effects of the pressures of the anticorrosion centrifugal pump; allowing the atomized corrosion inhibitors to downwardly flow under the effect of the gravity along the annular spaces; allowing the atomized corrosion inhibitors to flow out of an oil pipe along with oil and gas so as to form a uniform protective film on each of the inner wall of a casing and the inner and outer walls of the oil pipe. The process and the device have the advantage that the usage of the corrosion inhibitors can be effectively reduced, and accordingly the downhole string corrosion protection cost can be lowered; the process is unaffected by the types of well sections, the corrosion inhibitors can completely cover the inner wall of the casing and the outer wall of the oil pipe, and the corrosion inhibitor films are good in integrity; the device is used for implementing the process for atomizing and injecting the wellhead corrosion inhibitors.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well safety, and in particular relates to a wellhead corrosion inhibitor atomization filling process and device. Background technique [0002] In the process of oil and gas extraction, the oil casing string is the main production channel for oil and gas to move from the bottom of the well to the surface. Since the bottom of the production well is in a state of high temperature and high pressure, this will make the downhole CO 2 / H 2 S corrosive gas or downhole steam expands and moves upward, and enters the oil casing annulus to cause corrosion damage to the oil casing and destroy the integrity of the wellbore, thereby reducing the service life of the downhole tubing string and endangering the production safety of the wellbore. At present, the injection of corrosion inhibitor is one of the main technical measures for the protection of the oil casing annulus. Usually, the corrosion inhibitor i...

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Problems solved by technology

[0003] However, the above-mentioned method of injecting corrosion inhibitor injection has the following disadvantages: 1. The corrosion inhibitor smear is affected by different types of well sections, and the corrosion inhibitor cannot completely cover the inner wall of the casing and the outer wall of the tubing, and the corrosion inhibitor does not Evenly applied, the integrity of the film is poor; 2. This method uses a large amount of corrosion inhibitor, which increases the cost of downhole pipe string corrosion protection

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