WELL PUMPING UNIT FOR SIMULTANEOUS SEPARATE DEVELOPMENT OF TWO RESERVOIRS Russian patent published in 2011 - IPC F04B47/02 

FIELD: gas-and-oil producing industry.

SUBSTANCE: pumping unit consists of flow string with sub bushing at lower end wherein cylinder of upper pump is secured with its upper ends. A solid jacket is installed outside the cylinder with a circular gap. Radial channels are made in the sub bushing above the level of the upper pump cylinder. Lower ends of the upper pump cylinder and the jacket are secured in a sub wherein there are made radial and vertical channels and a unit for rod packing. The rod connects plungers of the upper and lower pumps. The rod is solid with diametre not less, than diametre of the lower pump plunger. The upper end of lower pump cylinder enveloped with a bearing pipe is fastened to the lower part of the sub via a solid branch and the bearing pipe. A shank end with filter at the end and a packer is connected to the lower end of the bearing pipe. The packer is arranged between upper and lower reservoirs. Discharge output of the upper pump is tied with a string of hollow rods; at a wellhead the string is introduced into a system of upper reservoir production collection. Discharge output of the lower pump is connected with internal cavity of flow strings via vertical channels of the sub, circular cavity between the cylinder of the upper pump and its jacket and via radial channels of the sub bushing. At the wellhead the flow strings are communicated with a system of lower reservoir production collection.

EFFECT: simplification of unit assembly in well; development of bottomhole zone without unit lifting and without packer break; killing both upper and lower reservoirs; drainage of fluid from pipes of unit at its lifting to surface during repair operations.

6 cl, 1 dwg