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AssigneeInstitut Francais du Petrole
InventorsHenri Cholet, Francois-Jean Trocqueme, Jean Garraux
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A control process for a rotary pump which is immersed in a fluid produced by a well involves the use of a rotary pump driven by a variable speed motor and comprises the steps of acting upon the rotational speed of the motor according to a pressure difference which exists between the pressure of the fluid measured in the proximity of the pump and the production pressure of the well. The production pressure P of the well being given by the formula: P=P.sub.G -Q/I.sub.p wherein P.sub.G is equal to the pressure of the unused deposit; that is, the pressure of the fluid deposit when the fluid deposit is at rest and there is no production of the well, Q equals the pump flow rate according to the motor rotation speed and I.sub.p is equal to the well productivity indication. The apparatus for carrying out the process includes, in combination, a helicoid rotary pump and an electric motor driving the pump at a speed proportional to the frequency of the electric current fed to the motor and is provided with an arrangement for automatically adjusting the flow delivered by the pump. The adjusting arrangement includes at least one pressure sensor delivering a signal linked to the submergence level of the pump in service and a set of electric circuits for processing the measuring and control signal of the frequency of the current supplied to the motor according to the value of the measuring signal.
A pumping device, especially for pumping of a very viscous fluid containing a sizeable proportion of gas, particularly for the production of petrol, the pumping device comprising a unit immersed in the fluid, said unit including at least one delivery pump coupled to an electric drive motor, the delivery pump having at least one admission opening and one opening communicating with a fluid delivery pipe, characterized in that the pumping device includes at least one volumetric helicoid rotary pump and a motor for driving the helicoid rotary pump at a speed substantially proportional to a frequency of an electric current feeding the motor, and means for automatically adjusting a flow delivered by the helicoid rotary pump, said adjusting means comprising at least one pressure sensor means for deliverying an electric measuring signal linked to a dynamic submergence level of the helicoidal rotary pump in service and a set of electrical circuit means for determining a production pressure from a flow rate of the helicolidal rotary pump and for processing a measuring and control signal of the frequency of the current supplying the drive motor of the helicoidal rotary pump in accordance with a determined pressure differential of said measuring signal and said production pressure.
A control process of a rotary expansible chamber pump immersed in a fluid produced by a well, the pump being rotary driven by a variable speed motor, characterized in that the process comprises determining a pressure differential .DELTA.p existing between a pressure of the fluid measured in a proximity of the rotary pump and a production pressure P of the well, with the production pressure P of the well being determined in accordance with the following relationship:
Dependencies are inferred from the claim text.