SLIDING CALIBRATOR-CENTRALIZER Russian patent published in 2019 - IPC E21B17/10 E21B7/28 

FIELD: oil and gas industry.

SUBSTANCE: proposal relates to oil and gas industry, namely to devices for increasing diameter of well in given interval. Calibrator-centralizer extending comprises housing with central through channel, blades provided with calibrating elements installed in housing slots with possibility of extension, and blade extension mechanism into working position, comprising hollow shaft with piston arranged in housing through passage. Hollow shaft has holes, and blades are equipped with shanks. Housing in upper part is equipped with connecting thread, shanks of blades are made in form of ledges in upper and lower parts of blades, arranged in upper and lower parts of housing slots respectively, and fixed against unauthorized removal to outside by sleeves, which are rigidly fixed in upper and lower parts of housing slots. Hollow shaft in upper part is made in the form of piston, in middle part has conical surface, and holes of hollow shaft are located in lower part radially at an angle relative to central axis and connect feed channel and slots of housing, in which blades are arranged. Hollow shaft interacts conically with blades by means of spring rings, spring-loaded in transport position by spring and is equipped with nozzle to create differential pressure for movement of hollow shaft into working position.

EFFECT: preventing jamming of the device in the well and obtaining a calibrated barrel of the required diameter, avoiding emergency situations in the well.

3 cl, 2 dwg