DEVICE FOR INTERVAL FORMATION TREATMENT IN OPEN HORIZONTAL SHAFT OF WELL Russian patent published in 2017 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: device for interval formation treatment in an open horizontal shaft of well comprises the main packer with cup-type seal and feedthrough body, additional packer with additional cup-type seal and cylindrical bushing, a hollow shaft with radial channels connecting the feedthrough body of the main packer and a cylindrical bushing of the additional packer, placed at different length exceeding formation treatment interval, the length of the hollow shaft covers the treated formation interval in a horizontal well by the main and additional packers. Cup-type seals of the main and additional packers are made as the main and additional rubber inflatable elements with respective inner cavities interconnected hydraulically by a tube. A hollow bushing is telescopically inserted into the cylindrical bushing of the additional packer, it is equipped with a radial opening having in its initial position a hydraulic connection with inner cavity of the additional inflated rubber element of the additional packer by a circular rabetting and hydraulic channel made in the additional packer cylindrical bushing. The hollow bushing is provided with an annular groove outside and is supported by spring in upward direction in regards to the additional packer cylindrical bushing. A stopper is installed in the hollow bushing opposite its radial hole, it is fixed by destructible element in the initial position, a shear ring is fixed behind the stopper in the additional packer cylindrical bushing, having the opportunity to interact wit the stopper after the opening of the hollow shank radial hole. A hollow case is telescopically installed on the hollow bushing, equipped with an inner circular breakdown with a locking split ring installed in it. The hollow case is fixed in an initial position in regards to the hollow bushing by a shear pin. In the operating position after the destruction of the shear element the hollow bushing may be moved axially downwards in regard to the hollow body and cylindrical bushing of the auxiliary packer by compression of the spring, fixation of the locking split ring, installed in the inner circular breakdown of the hollow case, to the outer annular groove of the hollow bushing, tight cutoff of the radial surface of the hollow bushing by the additional packer cylindrical bushing, destruction of the shear ring fixed to the hole bushing with the stopper, movement of the hole bushing up to the stop to the inner step of the main packer feedthrough body with fluid communication through the radial openings in the hollow barrel to the treated bed.

EFFECT: increasing operating efficiency of the device.

3 dwg