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Use of Downhole Electric Motor, Coupled to Downhole Hydraulic Turbine to Generate Disclosure Number: IPCOM000035622D
Publication Date: 2005-Jan-27

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The purpose is to make use of gravity feed injection wells to convert injection fluid movement to electrical energy. By coupling an efficient slim hydraulic turbine to a slim electrical motor, this can be accomplished efficiently. The water rate is controlled at surface using a choke to limit the turbine speed to operate motor at synchronous speed (based on the turbine characteristics). This may be most applicable in geothermal operations where injectivity is high and reinjection is part of process. Detailed Description of the invention(s): 1.Describe the invention in detail. Describe the preferred manner of practicing the invention including listing the steps, method, composition and operation of the invention. Point out features that are believed to be new and how the invention overcome the disadvantages of the old manner. Attach electronic documents such as sketches, drawings, photographs, logs, etc., as needed. Non-electronic documents must be sent to the Legal Department representatives. Install downhole system comprised of electric submersible motor, seal, hydraulic turbine configured to achieve rotational speed of 3600rpm at design rate and pressure for the setting depth. Motor selected to deliver horsepower achievable with selected turbine at design rate and pressure. Equipment run on jointed tubing designed to handle design rate and pressure. Tubine suspended from well with tubing hanger at wellhead. Cable connected to surface electrical system provided by electrical generator partner. Injection rate can be controlled by surface flowline choke. Rate controlled by monitoring injection rate via meter. Additionally downhole sensor for turbine speed can be utilized to manage injection rate. Power fluid needs to be free from large particles, and non scaling. If there is scaling tendancy, scale inhibition treatment is required. 2.Describe any alternate constructions, methods, compositions or processes of the invention (oven if such alternate embodiments will possibly never become commercialized, e.g., manufactured, used or sold) an alternative is to use a down hole Centrilift pump instead of turbine. This would be dramatically worse in efficiency. An alternative is to include a gear box so that the turbine could be designed to operate at much higher rotational speeds, thereby generating more horsepower. Example is to modify Centrilift gearboxes used for ESRCP applications to 3:1 and design turbine to operate at 12,000rpm, where it is more efficient. 3.Are further developments of the invention planned in the near future? No