downhole device

Abstract

The device is used in technical operations during well completion. The device acts as a sealing device by using a seal ( 5 ). The seal ( 5 ) divides the well into an upper cavity ( 16 ) and a lower cavity ( 17 ). The seal ( 5 ) includes a collet ( 7 ) that comprises segments ( 8 ), a liner ( 10 ), springs ( 11 ) and a casing ( 6 ). The segments ( 8 ) are capable of separating upon interaction with the well equipment (drilling column ( 19 )) and are provided with additional seals ( 9 ). The casing ( 6 ) is situated in the lower portion of the collet ( 7 ) and enables the movement of the segments ( 8 ) upon the separation thereof The seal ( 5 ) is situated in a threaded ( 2, 3 ) housing ( 1 ). The housing ( 1 ) is secured in a roller bearing ( 4 ). The device further includes an adjustment insert ( 12 ) that is capable of interacting with the well equipment upon the is installation thereof and of moving the same so as to open the channel of a hydraulic connection ( 13 ) between the well opening, the upper cavity, the lower cavity and the producing formation. This technical solution makes it possible to carry out any well completion operation, prevent the inflow of formation fluids and increase the yield of the well, well completion being carried out without the generation of overbalance on the formation. 3 dependent claims, 7 figures.

1 . Downhole device comprising: a housing; a bearing assembly; and a seal connected with the well equipment, where the sealing feature of the device is provided by means of a seal separating the well into the upper and lower cavities, with the presence of hydraulic connection between the well opening and the upper cavity and between the lower cavity and the producing formation, correspondingly, containing the collet with segments in the lower part capable of separating at interaction with the well equipment and provided with the additional seals on the lateral surfaces, with the liner on the external surfaces, springs and encasing located in the lower part and providing arrangement of segments at their separation, and located in the housing having the upper thread and fastened in the bearing assembly; at that, the device is additionally equipped with the locating insert capable of interacting with the well equipment during its installation and of moving the same so as to open the channel of a hydraulic connection between the well opening, the upper cavity, the lower cavity and the producing formation. 
     
     
         2 . The device as per  claim 1 , where the bearing assembly comprises an oil-filled sealed bearing. 
     
     
         3 . The device as per  claim 1 , where the liner is made of a strong flexible material. 
     
     
         4 . The device as per claim, where a lower thread is additionally provided on the housing.