ADJUSTABLE STRING DISCONNECTOR Russian patent published in 2019 - IPC E21B17/06 E21B23/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to equipment of oil and gas industry as part of sets of underground equipment, namely for disconnection of above-packer part of tubing string and packer section. Disconnector of an adjustable column comprises a body with a thread and a seal, a gripping element in form of a collet with resilient blades and connected to the body, inside of which there is a sealing element, a threaded tip installed inside the housing. In the lower part the disconnector of the column is equipped with a threaded tip, having a cutting edge directed downwards, wherein gripping element has shear bolts with heads screwed from inner side into threaded holes made in bulges formed by outer protrusions of collet lobes middle part, in an amount determining required separation force, wherein the shape of the shear screw head is selected such that when the head of the shear head touches the force below the shear force, the cutting edge does not touch the surface of the shear screw.

EFFECT: elimination of influence of accuracy of parts manufacture, spread of parameters of gripper of gripping element on stability of value of disconnection force, reducing them mainly to spread of parameters of shear bolts and to execution of cutting edge, allows to correct value of disconnection force by simple change of quantity of shear bolts without change of design.

1 cl, 3 dwg