METHOD OF CLEANING AND MAINTENANCE OF WELLS AND PIPELINES Russian patent published in 2015 - IPC E21B37/00 B08B9/02 

FIELD: mining.

SUBSTANCE: method presumes the action in view of types of deposits on the cleaned surface by setting of the respective values of physical parameters of the effecting working medium, geometry of a cavitator and its position with reference to the cleaned surface: $$\overline{x},$$ P_c and Ps, where $$\overline{x}$$ - relative distance from the cavitator outlet to the cleaned surface, P_c - dynamic pressure downstream the cavitator, Ps - static pressure in the flooded cavity. Values of the parameters $$\overline{x}$$ and Pc are pre-set within the limits: $$\overline{x}=5-\mathrm{50,}$$ P_c=5-45 MPa. Static pressure P_s in the flooded cavity is pre-set according to the condition $$P_s=\mathrm{0,075}{P}_c\exp (-\mathrm{0,4}\sqrt{\overline{x})}$$ with providing of pulsation of the jet cavitating flow with a variable frequency and achievement of a resonance of layers of deposits. The pulsation of the jet cavitating flow is provided using a sweep generator. Occurrence of resonance of layers of deposits is identified by growth of concentration of pollution of destroyed layers in the taken-away flow, the frequency of pulsation of the jet cavitating flow is registered, at this frequency the cleaned surface is processed further.

EFFECT: improvement of efficiency of cleaning and maintenance of wells and pipelines increases.

9 cl, 5 dwg