This patented remotely controlled completion system used in three-reservoir waterflood injection wells for reservoir pressure maintenance includes three mechanical packers with their controlled electric valves (CEV) for simultaneous multi-reservoir injection (MRI) into three reservoirs through a single tubing string. A reagent is injected through the wellhead and a single tubing string into the upper CEV and the lower TMUs for real-time measurement of pressure, flow rate and temperature (P, Q and T) and flow-rate control using CEVs separately for three reservoirs. 


  • For cost reduction in multi-reservoir fields and waterflood injection wells penetrating reservoirs with different properties;
  • To use currently inactive wells and reservoirs for reservoir pressure maintenance;
  • To shut in a reservoir in an injection well for maintenance and workover operations in responding production wells with no well killing


  • The entire system, including controlled electric valves (CEV), is controlled in real time remotely or from Geonik‘s control station;
  • Two-way communication to obtain injection data from telemetry units (TMU) with Р, C and T gauges and precise opening and closing regulation of CEVs through logging cable;
  • Dynamic testing of each reservoir with recording of pressure fall-off curves by shutting in one of the reservoirs;
  • The system is run and set in the well in two stages: (1) setting a two-packer system and (2) running an SIMU and the upper packer on tubing for connection to the two-packer system;
  • Real-time injection management of each reservoir using downhole gauge and flow-meter data from TMUs;
  • Lower TMU with the upper packer can be retrieved from the well without the lower two-packer system;
  • No additional tubing used with hydraulic valves for multi-reservoir injection is required due to ease of installation and high performance of the system.
Item code Casing string, mm/inn CEV seat diameter mm/in Pressure difference at CEV, MPa/psi Maximum temperature (°C/F)

TMU w/gauges

Tubing thread diameter mm/inn Downhole environment
Nominal diameter Wall thickness
MRI-3CEV-3TMU-118 140/5.51 6-8/0.2-0.3 12/0.47; 20/0.78 ⃰ 30/


120/248; 150/302 ⃰ 73/2.87 Formation water


Associated gas

Gas condensate

Natural gas

146/5.74 9-11/0.35-0.43
MRI-3CEV-3TMU-120 146/5.74 6,5-10/


12/0.47; 20/0.78 ⃰ 30/


120/248; 150/302 ⃰ 73/2.87
MRI-3CEV-3TMU-140 168/6.61 8-11/


12/0.47; 20/0.78 ⃰ 30/


120/248; 150/302 ⃰ 73/2.87
178/7 13-15/


MRI-3CEV-3TMU-145 168/6.61 7,3-8/


12/0.47; 20/0.78 ⃰ 30/


120/248; 150/302 ⃰ 73/2.87
178 11.5–12.7

* by personal request