Under-pressure dosing device for oil well casing

The invention relates to the technical field of petroleum production matching, and particularly discloses an oil well casing pipe under-pressure chemical feeding device which comprises a casing pipe, a chemical feeding device and a chemical feeding device. The oil way pipe is positioned in the sleeve; the bin body structure is arranged in the casing pipe; the under-pressure medicine supply device is arranged in the bin body structure; the mixing device is arranged outside the sleeve; the under-pressure chemical supply device comprises an adjusting device, a chemical supply device, a chemical supply device, a chemical supply device, a chemical supply device and a chemical supply device, the dosing pipe assemblies are connected with the adjusting device and used for being matched with the adjusting device to guide out the medicament under pressure, the device is reasonable in design, low-resistance rapid guide-in of internal dosing equipment is achieved through matching of the adjusting device and the dosing pi