Patent RU-2360103-C1 (RU)
Inventor: SHENGUR NIKOLAJ VLADIMIROVICH
IPC: E21B43/18
Filed: 2007-12-11
Granted: 2009-06-27
Abstract: FIELD: mining. 
     SUBSTANCE: packer and jet pump assembled on flow string are lowered into well; notably, jet pump is equipped with channels for working agent supply and for produced fluid pumping-out. The jet pump and the packer are arranged over the level of perforation of a cased pipe in the zone of the production reservoir. Further the latter is packer-released. Depression in the production reservoir is created by means of influencing upon it with pressure of working agent supplied into the nozzle of the jet pump at specified pressure. Repression in the production reservoir is formed by influencing on it with pressure of working agent developed in under-packer space. Also pressure of working agent in the production reservoir is set higher, than pressure of the reservoir. Described above cycle of effecting bottomhole zone of the production reservoir with depression and repression is repeated. Consumption and pressure of production fluid under the packer are measured; and by value of growth of well yield at preset pressure of production fluid there is determined the degree of recovery of permeability of bottomhole zone of the production reservoir. Effect onto the reservoir is stopped, when well yield turns stable; working agent for creating depression is supplied through annular space, through the outlet of the jet pump and via the channel for production fluid pumped out the well. The assembly consists of a flow string, of an upper cylinder case, of a packer with a central channel disconnecting annular space with under-packer zone and of a jet pump installed in the upper cylinder case, the suction chamber of which is communicated with the under-packer zone, while the outlet is communicated with annular space. The assembly also consists of an upper divider of flows installed in the upper cylinder case. The divider of flows consists of lengthwise and radial hydraulic channels, of a lower cylinder case, the upper end of which is connected to the lower end of the packer, while the lower end of the flow divider is connected with a consumption and pressure metre, and of a lower flower divider installed in a lower cylinder case. In the lower flow divider there are made radial and lengthwise hydraulic channels, and an intermediary channel in form of a pipe assembled in the central channel of the packer and connected with upper and lower flow distributors. Further the assembly consists of back valves, the first of which is installed before the nozzle of the jet pump, the second one is installed between the intermediary channel and the upper flow distributor, the third one is installed before the corresponding lengthwise channel of the lower flow distributor, and the fourth back valve is installed before the radial channels of the lower flow divider. The lengthwise and radial channels in the flow divider are made so, that the flow string is hydraulically connected with annular space via the back valve, the jet pump, and the radial channels of the upper flow divider. The inlet of the jet pump is hydraulically connected with under-packer zone via the corresponding channels of the upper flow divider, the central packer channel, the corresponding channels of the lower flow divider, and the third back valve. The central channel of the packer is connected with the flow string through the corresponding lengthwise channels of the lower flow divider, the fourth back valve, the radial channels of the lower flow divider, the intermediary channel, the second back valve, and the corresponding channels of the upper flow divider. 
     EFFECT: increased efficiency of treatment of bottomhole zone of reservoir, intensification of hydraulic effect and improved operational characteristics. 
     6 cl, 2 dwg