DEVICE FOR INTERVAL HYDRAULIC FRACTURING OF FORMATION Russian patent published in 2017 - IPC E21B43/26 E21B43/112 

FIELD: oil and gas industry.

SUBSTANCE: device for performing interval-by-interval fracturing of the formation comprises a tubing string with a hollow cylindrical body connected to packer through a tail-piece at the bottom. A hollow bushing is mounted radially and rigidly in the hollow cylindrical body. A piston-punch is positioned inside the hollow bushing for limited radial movement, and configured as a cone narrowing outwards with a throttling L-shaped channel in the center. At that, the piston-punch is equipped with external radial groove communicating with the throttling L-shaped channel. The piston-punch is spring-loaded by a spring inside from the sleeve rigidly fixed in the end of the hollow bushing. In this case, a radial channel is made in the hollow bushing. In the initial position the radial and the throttling L-shaped channels are hermetically separated from each other, in the working position the vertical and throttling L-shaped channels are hydraulically communicated with each other by means of a radial groove connecting the hollow cylindrical body cavity with rock of production reservoir. A dynamic anchor is installed in the upper part of the hollow cylindrical body, and a subsurface gauge is installed under the packer.

EFFECT: improved performance of the device when conducting hydraulic fracturing of the formation.

2 dwg