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.