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US 5,015,151 AGranted
Motor controller for electrical submersible pumps
AssigneeShell Oil Company
InventorsDale R. Snyder, Jr., Joe H. Haws
Life of this patent
Estimating the term…
Abstract
Differential motor load drops are employed to indicate gas lock or pump off of an electrical submersible pump.
Claims36
A method for measuring differential pump fluid power output comprising:
- (a) measuring pump motor power consumption at timed intervals;
- (b) determining a recent pump motor power consumption from the measurements;
- (c) determining a previous pump motor power consumption from the measurements;
- (d) deriving the difference between steps (b) and (c), the difference being indicative of differential pump fluid power output;
- and
- (e) shutting the pump down when said differential exceeds a predetermined amount for a predetermined length of time.
3 more elements
A method for detecting loss of pump fluid power output comprising:
- (a) measuring pump motor power consumption at timed intervals;
- (b) determining a recent pump motor power consumption from the measurements;
- (c) determining a previous pump motor power consumption from the measurements;
- (d) deriving the difference between steps (b) and (c), the difference being indicative of loss of pump fluid power output when said difference exceeds a predetermined quantity;
- and
- (e) shutting the pump motor down when said difference is detected which exceeds a predetermined quantity for a predetermined length of time.
3 more elements
Apparatus for measuring differential pump fluid power output comprising:
- (a) means for measuring pump motor power consumption at timed intervals;
- (b) means for determing a recent pump motor power consumption from the measurements;
- (c) means for determing a previous pump motor power consumption from the measurements;
- (d) means for deriving the difference between steps (b) and (c), the difference being indicative of loss of differential pump fluid power output when said difference exceeds a predetermined quantity;
- and
- (e) means for shutting the pump motor down when said difference exceeds said predetermined quantity.
3 more elements
(Twice amended) Apparatus for detecting loss of pump fluid power output comprising:
- (a) means for measuring pump motor power consumption at timed intervals;
- (b) means for determining a recent pump motor power consumption from the measurements;
- (c) means for determining a previous pump motor power consumption from the measurements;
- (d) means for deriving the difference between steps (b) and (c), the difference being indicative of loss of pump fluid power output when said difference exceeds a predetermined quantity;
- and (e) means for shutting the pump motor down when said loss of pump fluid power output is detected which exceeds a predetermined quantity for a predetermined length of time.
2 more elements
A method for detecting electrical submersible pump motor underload, comprising:
- (a) measuring pump motor loads at timed intervals;
- (b) determining a recent pump motor load from the measurements;
- (c) determining a previous pump motor load from the measurements;
- (d) deriving the difference between steps (b) and (c), the difference being indicative of pump motor underloaded when said difference exceeds a predetermined quantity;
- and
- (e) shutting the pump motor down when said under-load is detected.
3 more elements
A method for detecting electrical submersible pump motor underloaded, comprising:
- (a) measuring pump motor loads at timed intervals;
- (b) determining a recent pump motor load from the measurements;
- (c) determining a previous pump motor load from the measurements;
- (d) deriving the difference between steps (b) and (c), the difference being indicative of pump motor underload when said difference exceeds a predetermined quantity;
- and
- (e) shutting the pump motor down when said underload is detected which exceeds a predetermined length of time.
3 more elements
A method for detecting electrical submersible pump motor underload, comprising:
- (a) measuring motor current at timed intervals;
- (b) determining the most recent motor current from the measurements;
- (c) determining a moving average of the previous motor current from the measurements;
- (d) derving the difference between steps (b) and (c), the difference being indicative of pump motor underload when said difference exceeds a predetermined quantity;
- and
- (e) shutting the pump motor down when said difference exceeds one percent and wherein oil is being pumped in a non-gassy pumping condition.
3 more elements
A method for detecting electrical submersible pump motor underload, comprising:
- (a) measuring motor current at timed intervals;
- (b) determining the most recent motor current from the measurements;
- (c) determining a moving average of the previous motor current from the measurements;
- (d) deriving the difference between steps (b) and (c), the difference being indicative of pump motor underload when said difference exceeds a predetermined quantity;
- and
- (e) shutting the pump motor down when said difference exceeds one percent for more than two seconds and wherein oil is being pumped in a gassy pumping condition.
3 more elements
An apparatus for detecting electrical submersible pump motor underload, comprising:
- (a) means for measuring pump motor loads at timed intervals;
- (b) means for determining a recent pump motor load from the measurements;
- (c) means for determining a previous pump motor load from the measurements;
- (d) means for deriving the difference between steps (b) and (c), the difference being indicative of pump motor underload when said difference exceeds a predetermined quantity;
- and (e) means for shutting the pump motor down when said underload is detected.
2 more elements
An apparatus for detecting electrical submersible pump motor underload, comprising:
- (a) means for measuring pump motor loads at timed intervals;
- (b) means for determining a recent pump motor load from the measurements;
- (c) means for determining a previous pump motor load from the measurements;
- (d) means for deriving the difference between steps (b) and (c), the difference being indicative of pump motor underload when said difference exceeds a predetermined quantity;
- and
- (e) means for shutting the pump motor down when said underload is detected which exceeds a predetermined length of time.
3 more elements
An apparatus for detecting electrical submersible pump motor underload, comprising:
- (a) means for measuring motor current at timed intervals;
- (b) means for determining the most recent motor current from the measurements;
- (c) means for determining a moving average of the previous motor current from the measurements;
- (d) means for deriving the difference between steps (b) and (c), the difference being indicative of pump motor underload when said difference exceeds a predetermined quantity;
- and
- (e) means for shutting the pump motor down when said difference exceeds one percent and wherein oil is being pumped in a non-gassy pumping condition.
3 more elements
An apparatus for detecting electrical submersible pump motor underload, comprising:
- (a) means for measuring motor current at timed intervals;
- (b) means for determining the most recent motor current from the measurements;
- (c) means for determining a moving average of the previous motor current from the measurements;
- (d) means for deriving the difference between steps (b) and (c), the difference being indicative of pump motor underload when said difference exceeds a predetermined quantity;
- and
- (e) means for shutting the pump motor down when said difference exceeds one percent for more than two seconds and wherein oil is being pumped in a gassy pumping condition.
3 more elements
Dependencies are inferred from the claim text.