This paper will outline the results of a field feasibility study to utilize hydraulic turbine applications for power recovery in water injection systems. The working principle of hydraulic turbine includes recovering excessive and unutilized energy in liquid flow systems. This is achieved through converting unexploited injection system pressure to electrical power generated by rotating turbines.

The powered water injection systems are often restricted to meet injection targets as part of the reservoir injection strategy to support oil production. Pressure losses in powered water injection systems take place at surface chokes that regulate injection target rates. Expected pressure losses in an injection flowline was determined through the analysis of frictional and gravitational pressure losses. The injection pump performance curves were also factored in as part of this rigorous evaluation. The feasibility study has been conducted with flexibility in mind to account for future changes in reservoir injection/production strategies.

Field-A candidates were explored and vetted to ascertain the achievability of applying this innovative power recovery concept on existing injection systems. A systematic candidate selection roadmap was established. The objective of this conceptual roadmap is to provide a means for conducting the primary assessment of candidate injection systems in Field-A. Several suitable injection systems were selected after a prudent evaluation of possible power recovery turbines candidates in Field-A. The expected power saving realized from applying hydraulic turbines was quantified in terms of net present value and return on investment. The economic impact from converting this pressure to power a hydraulic turbine was established, bearing in mind:

  1. The initial capital investment.

  2. Payback period.

  3. The projected inflation rate.

  4. The equivalent gas sales required to generate this power.

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