HORIZONTAL WELL FORMATION TREATMENT DEVICE Russian patent published in 2015 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: horizontal well formation treatment device includes a packer containing a through-way housing in an axial direction, which has a shaped slot on outer surface, a yoke with a pin and slips; with that, the pin is installed into the shaped slot and has a possibility of being moved along the shaped slot trajectory, an elastic cuff located between upper and lower supports. The upper support of the packer housing is rigidly connected to a disconnector. The disconnector includes a shaft with radial holes, with upper and lower threads and a spool-type valve located inside the shaft and a shear element connected to it. The spool-type valve is provided with an axial central hole and a mounting seat for a free-fall element dropped inside the device prior to treatment of the formation located above the packer. The lower ring is made in the form of a cover plate screwed on the lower thread of the disconnector shaft. The cover plate is equipped from below with external thread for connection to the passage-through packer housing, and the cover plate is equipped in its centre with a pin rigidly fixed on it and directed towards the spool-type valve, as well as axial holes in a circumferential direction. Carrying capacity of these holes is higher than that of the central hole of the spool-type valve, and the pin has a possibility of tight interaction with the axial central hole of the spool-type valve after the free-fall element is put on the seat of the spool-type valve and axial movement of the spool-type valve relative to the disconnector shaft. The elastic cuff is made in the form of two sealing rubber elements separated from each other with a metal washer. Upper and lower supports are made in the form of plates with a possibility of preventing flowing of the sealing rubber elements beyond their limits at fitting of the packer. Upper and lower supports are provided with flattened cones put at fitting of the packer on the sealing elements of the elastic cuff. The flattened cone of the upper support is directed with its apex in a downward direction, and the flattened cone of the lower support is directed with its apex in an upward direction. The disconnector shaft is provided with two internal annular grooves provided with split-type spring stop rings having a possibility of fixation of the upper end face of the spool-type valve after axial movement of the spool-type valve relative to the disconnector shaft. The free-fall element is made in the form of a stock provided from below with a semi-sphere above which there rigidly installed on the stock is a split-type centraliser made from reinforced rubber, and above the centraliser there rigidly installed on the stock is a solid sealing rubber ring.

EFFECT: horizontal well formation treatment device allows eliminating non-tight fit of the packer of the device in a horizontal formation of the well or loss of tightness of the packer during operation of the device, as well as enlarging functional capabilities of operation of the device and improving its operating reliability.

6 dwg