COILED TUBING FOR FORMING OF GRAVEL FILTER IN WELL Russian patent published in 2008 - IPC E21B43/04 

FIELD: mining; engines and pumps.

SUBSTANCE: coiled tubing for forming gravel filter in well includes pumping aggregate rigidly tied with suction pipeline and exhaust line connected to receiving capacity, and it also includes pressure pipeline. The pressure pipeline is equipped with mixer, pressure gauge, ultra sonic flow meter and sampler successively installed before a distributing unit. On both sides of the mixer taps and tee pieces are installed which connect the pressure pipeline with a side branch containing filter with taps on its input and output, while a back-pressure valve is installed at the output of the mixer. The exhaust line is connected to the receiving capacity. Coiled tubing additionally contains the distributing unit connected with tube space of a well via a communicating line and also with annular space of the well via a communicating line. The distributing unit is made of four connected to one other tee pieces with taps between them forming a closed circuit. One tee piece is rigidly connected to the pressure pipeline, the second one is connected with tube space of the well via a communicating line, the third one is connected with annular space of the well via a communicating line, and the fourth one is connected to the exhaust line.

EFFECT: upgraded quality of forming gravel filter.

1 dwg