Wellhead high-pressure-spraying agentia adding method and device for water injection wells

Abstract

The invention discloses a wellhead high-pressure-spraying agentia adding method and device for water injection wells. The wellhead high-pressure-spraying agentia adding method and device are designed for fixed-point agentia adding for the single water injection well and unpowered agentia adding at a high-pressure wellhead, namely, one end of a negative-pressure generating cavity is connected with a pressure pipeline with a nozzle, the other end of the negative-pressure generating cavity is sequentially connected with a throat pipe, a diffuser and a discharge pipe, and two ends of an agentia adding pipeline are respectively connected with an agentia storage tank and the negative-pressure generating cavity. The wellhead high-pressure-spraying agentia adding method includes that an anti-corrosion coating layer is surfaced on the inner wall of the nozzle at first, then a spraying device is arranged at the wellhead, high-pressure fluid is input so as to enable the negative-pressure generating cavity to generate negative pressure, and liquid agentia is sucked into the throat pipe and is injected into the water injection well through the discharge pipe after energy conversion. The wellhead high-pressure-spraying agentia adding method is simple to operate, energy-saving and lower in consumption. Technical process and the device are simplified. Since no motion parts are installed in the nozzle, the high-pressure-spraying agentia adding device is reliable to operate, leakproof and low in cost. The anti-corrosion coating layer of the nozzle has high density and uniformity, is resistant to washout and high pressure, can effectively protect the base body of the nozzle, and is easy to process and low in maintenance workload, and the service life of the device can be prolonged by 5-10 times of that of existing devices.

Description

technical field [0001] The invention relates to a high-pressure jet dosing method at the wellhead of a water injection well and a dosing device thereof, belonging to the technical field of high-pressure water injection dosing in oil fields. Background technique [0002] In the process of oilfield water injection, it is usually necessary to add agents such as corrosion inhibitors, bactericides, and scale inhibitors. The agent is injected into the water injection pipeline by a chemical dosing pump, and then injected into the water injection well after being pressurized by the water injection pump. [0003] At present, the dosing methods of water injection wells are usually divided into two types: one is to use a low-pressure dosing pump before boosting in the water injection station; the other is to fill with a high-pressure dosing pump at the wellhead of the water injection well. However, with the further development of the oil field, the environmental conditions are getting ...

AI Technical Summary

Problems solved by technology

However, with the in-depth development of the oil field, the environmental conditions are getting worse and worse, and the above methods have shown some incompatibility.

The in-station dosing method is only suitable for the whole block or well group. The dosing cost is high, and the pertinence is not strong, and single well dosing cannot be realized. Although the wellhead high-pressure dosing pump can meet the single well dosing, and is highly targeted, The dosage of chemicals is low, but high-pressure metering pumps need to be installed on site, which increases the workload of safety, management and maintenance and industrial power consumption

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