DEVICE FOR SEGREGATING STRATA Russian patent published in 1997 - IPC

FIELD: well drilling. SUBSTANCE: device has at least two packer units. The units are interconnected through a tube with a hole in its wall. A valve is installed in the hole. The valve overlaps the hole in the tube when liquid pressure is arisen. Packer units have a case and sealing member with upper and lower supports. The supports are placed on the trunk with holes in its wall. The telescopic trunk is instaled on hollow rod. The rod is made in each packer unit in the form of a pipe branch with a hole in its wall and external ledge on lower end. Pipe branch upper end of the upper packer unit is adopted for being connected to pipe string used to lower the device into the well. Upper ends of the subsequent packer units are connected to lower end of the string used to interconnect the packer units. Hydraulic chambers are used by the trunks of each packer unit together with their cases. They are open to each other in operation through the holes in the trunk walls and pipe branches to their hollow. Pistons are installed in the chambers. They are interacted with lower supports of the sealing members in packaging and dispackaging the packer units. EFFECT: multiple use of the device is provided. 2 dwg