METHOD AND DEVICE FOR MAINTAINING SUB-COOLED FLUID TO ESP SYSTEM
First Claim
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1. A method of producing wellbore fluid comprising:
- a) pumping wellbore fluid with an electrical submersible pump (ESP) assembly;
b) measuring fluid temperature and pressure before it enters the ESP assembly;
c) adding a subcooled margin to the measured fluid temperature to obtain a subcooled margin fluid temperature and identifying the fluid vapor pressure at the subcooled margin fluid temperature to define a subcooled pressure; and
d) controlling the pump so that the fluid pressure entering the ESP assembly is at least as great as the subcooled fluid pressure.
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Abstract
A method of operating an electrical submersible pumping system that includes realtime monitoring of the wellbore fluid and adjusting pump speed so the fluid entering the pump remains subcooled. The method can include adding sensors within the wellbore and digitally storing fluid data accessible by a pump controller. The pump speed can be increased or decreased by adjusting the frequency of the electrical power delivered to the pump motor.
25 Citations
13 Claims
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1. A method of producing wellbore fluid comprising:
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a) pumping wellbore fluid with an electrical submersible pump (ESP) assembly; b) measuring fluid temperature and pressure before it enters the ESP assembly; c) adding a subcooled margin to the measured fluid temperature to obtain a subcooled margin fluid temperature and identifying the fluid vapor pressure at the subcooled margin fluid temperature to define a subcooled pressure; and d) controlling the pump so that the fluid pressure entering the ESP assembly is at least as great as the subcooled fluid pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of producing fluid from a wellbore comprising:
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providing a submersible pump in the wellbore; pumping fluid with the pump; measuring fluid pressure and temperature flowing to the pump; defining a fluid subcooled pressure to be the fluid vapor pressure at a temperature exceeding the measured temperature by a subcooled margin value; comparing the measured pressure and the subcooled pressure; injecting steam into a formation adjacent the wellbore; and lowering the pump speed if the subcooled pressure exceeds the measured pressure. - View Dependent Claims (12, 13)
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Specification