DEVICE FOR WELL CEMENTING Russian patent published in 2013 - IPC E21B33/14 

FIELD: oil and gas industry.

SUBSTANCE: device for well cementing includes a hollow body, with radial holes, hollow millable pins, placed into radial holes, a cementing basket with spring tabs, a differential bushing placed outside the body above the cementing basket oppositely to the hollow millable pins, pressing with the lower part the spring tabs along their outer surface to the outer surface of the body and forming a tight circular cavity with the latter by the upper part. At the same time the device is made as capable of communicating the body cavity via cavities of the pins with the circular cavity in the working position of the device, displacement of the differential bushing into the extreme upper position, release of spring tabs and subsequent riveting of the differential bushing into the extreme lower position for final opening of spring tabs.

EFFECT: increased reliability of operation of a device and higher extent of overlapping of a circular space of a well in a zone of a device to control sedimentation events in process of cement mortar setting.

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