DEVICE FOR CEMENTING SHANK END IN WELL Russian patent published in 2011 - IPC E21B17/06 E21B33/14 

FIELD: oil and gas production.

SUBSTANCE: invention refers to device designed for cementing shank end in well. The device consists of shank end with a funnel on top and with a pressure seat beneath, and also of pipe string with a nipple pressure tight interacting with the funnel of the shank end. A disconnector interconnects an upper part of the shank end and a lower part of the pipe string and is made in form of a hollow case with a circular waist wherein there are made radial windows and with a hollow bush inserted into the circular waist and performing pressure tight travels downwards limited with a stop. The hollow bush is fixed with a shear element. Also, the hollow bush with conic external surface narrowing upwards in its lower section has radial channels coming out from the circular waist of the hollow case, when the hollow bush travels downwards. A seat for fall ball is made beneath the hollow bush. In transport position holders entering outside into a circular groove of the funnel are arranged in radial windows of the hollow case; from inside the holders, when sliding, interact with conic surface of the hollow bush. The holders travel inside under force of conic surface of the hollow bush transferred downwards and in working position they come out from interaction with the circular groove of the funnel.

EFFECT: simple design and reduced number of round trips which reduces material expenditures and total time for operations.

2 dwg