The article describes the dual production technology developed with application of new generation tools for process control and formation parameters monitoring with separate metering of production from each reservoir, as well as the results of the technology pilot tests.
Assemblies 1PROK-ORE with electric controlled valve KPUE-102 described herein were developed for dual production from wells.
Electric valve KPUE-102 allows full closing, opening and choking of tubing bore for lower formation product with remote control of these functions from ESP control panels.
These assemblies are designed for:
- production from two formations with one ESP,
- isolation of upper or lower formation for separate metering of produced fluids,
- measuring of pressure build-up curve of the isolated formation.
Besides, the presented devices help to optimize the fluid recovery from formations in order to achieve maximum flow rates.
For formations operation monitoring purposes the control station supplies power to KPUE valve motor via the ESP motor power cable. This closes the tubing bore, then pressure rises up to the actual formation pressure value of the lower reservoir. A pressure sensor installed in the KPUE valve transmits the pressure readings to the data receiving and processing unit.
This procedure is repeated regularly, e.g. twice a month.
After the pressure measurement the pump operation continues. The process is maintained due to availability of a device eliminating ESP motor current impact onto the KPUE valve operation. At this time the pump in low frequency mode pumps fluid from the upper reservoir. A pressure sensor installed in the submersible telemetry unit records the annular pressure. The required pressure is maintained by predetermining the permissible pressure loss below KPUE valve for optimal operation of the lower formation.
Thus, electric KPUE valve performs two functions: the first one is measuring the lower reservoir formation pressure during pump operation; the second one is shutting off the fluid flow from the lower reservoir.
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