ALMAZ Oilfield Service

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Solutions for high-water-cut wells (downhole separation)

ALMAZ Oilfield Service professionals have developed several options of layouts for downhole separation

Solutions for high-water-cut wells (downhole separation)

We propose a simplified layout of downhole separation with a high-frequency emitter as a water separation accelerator for implementation.

The flow of gas-liquid mixture from the lower layer rises up the ESP along the tubing string 73, further along the tubing string 48 insert and further above the upper packer along the tubing string 73 it reaches the water separation accelerator zone. 

After treatment with high-frequency radiation, the flow is bypassed into the annular space, where the produced water begins to separate under the action of gravity with downward movement. After the hydraulic controller is opened, the produced water is disposed of in the upper layer. Instruments control the density and water content of the flow in the tubing and in the separation zone.


Restriction 1

Perforation and testing of the disposal layer for the intake of produced water, at the same time the layer shall absorb the required volume of water (50-100 m3/day) at a wellhead pressure of no more than 30-40 atm

Restriction 2

After acid treatment during well interventions to increase the injectivity, pumping of at least 200 m3/day is required to understand the injectivity value after saturation of the upper layer (after saturation, the injectivity often decreases to a value below the planned one, sometimes the layer ceases to absorb at a wellhead pressure of 30-40 atm)

Downhole separation assembly functions:

  1. It separates extraction layers and produced water disposal layers;
  2. The hydraulic controller passes the separated produced water into the upper layer;
  3. Instruments control water composition. If there is oil in produced water, the hydraulic valve closes.
  4. It is possible to take wellhead samples without produced water disposal and in the process of produced water disposal to the upper oil-bearing intake layer, to assess water cut.
  5. Water disposal for flow string 168 of no more than 80-100 m3 /day, for flow string 178 – no more than 120-150 m3/day.
  6. In case of stable emulsions, demulsifiers are injected in the water separation accelerator zone.
  7. Determination of the fluid flow rate at the ESP intake using the BINUS 5-700 system (intellectualization block for the lower level of wells operating in the range of 5-700 m3).
  8. Complete digitalization of the control process for the operation of the equipment complex based on the accurate determination of the wells flow rate using the BINUS system
  9. Data of all operating parameters (current, voltage, load factor, P, T, V, pump flow rate, etc.) are transmitted in real time.

ALMAZ Oilfield Service professionals have developed a downhole separation scheme designed to study the potential of the intake reservoir and the maximum volume of water separation in the well lift using demulsifiers and high-frequency emitters when there is no reliable data on the intake layer and the water separation rate. This scheme allows sampling of both gas-liquid mixture and produced water at the wellhead to assess the potential of downhole separation technology for different flow strings.

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