DEVICE FOR CEMENTATION OF CASING STRING IN WELL Russian patent published in 1999 - IPC

FIELD: oil and gas production industry. SUBSTANCE: this relates to drilling of oil and gas wells. Device is made up of casing string, shoe, sleeve, stop ring. Included in device setup is hydrodynamic emitter which is made in the form of at least one system of rotor and stator. Blades of rotor and stator have openings. Openings of rotor and stator are asymmetrical. Hydrodynamic emitter is located between stop ring and shoe. Made in casing string above emitter is opening intended for directing flow of hydraulic pulses into annular space. Application of aforesaid embodiment of device improves quality of cementation due to subjecting plugging solution to effective treatment in annular space by pulses of hydrodynamic waves. EFFECT: higher efficiency. 4 dwg