CHEMICAL INJECTOR Russian patent published in 2010 - IPC E21B23/06 E21B33/12 

FIELD: oil and gas production.

SUBSTANCE: invention refers to oriented injections of various chemicals in preset intervals of a well in processing a bottomhole with acid and other solutions, and also in squeeze cementing for liquidation of behind-the-casing flows and limitation of water inflow to the well by selective injection of plugging solutions. The chemical injector comprises a hollow integrated body with radial holes and a seat on a lower end face for a free gate, upper and lower packing units, a valve unit in-between and an anchor unit of ram holder with the rams arranged under the lower packing unit. The anchor unit is supplied with a ring cone fixed on the body by shear elements, a ring forming an annular space with the body wherein there are mounted a differential bushing, an attached nut and a clamp in the form of a cutting spring ring notched on the internal surface, interconnected with the body. The ring cone is spring-assisted and also interacts with the differential bushing. In the ram holder, there is a spring-assisted clamp. On the external surface of the body, there is an annular groove for the clamp under the ram holder.

EFFECT: improved reliability and functionality of the device.

6 dwg