DEVICE FOR CONTROL OVER WELL CEMENTING Russian patent published in 2011 - IPC E21B33/68 

FIELD: oil and gas production.

SUBSTANCE: device consists of measuring unit with flow metre, pressure and temperature sensors pressure tight installed in mouths of main coupling positioned between two sections of flow string with quick-split connecting members. Also, here is introduced an additional coupling with a density sensor mounted on it, including an emitter, an overlaid detecting unit and a computer station. The additional coupling can be matched with the main one or spaced from it in axial direction. In its central part the additional coupling has a mouth comprising a plug with the emitter. On external side of the additional coupling at the point of the detecting unit location there is made a groove attenuating emission flow; distance between the emitter and internal surface of the coupling exceeds internal diametre of the flow string.

EFFECT: accuracy of grout mix density control and improved operational parametres.

4 cl, 4 dwg