Adaptive pump control for positive displacement pump failure modes
First Claim
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1. A method, comprising:
- detecting a failure mode of a fluid flow controller configured to control fluid flow between first and second chambers of a downhole positive displacement pump and a flow line, wherein the positive displacement pump comprises a piston moving in an axial reciprocating motion; and
adjusting operation of the downhole positive displacement pump based on the detected failure mode such that the downhole positive displacement pump piston operates differently in different axial directions.
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Abstract
Detecting a failure mode of a fluid flow controller configured to control fluid flow between first and second chambers of a downhole positive displacement pump and a flow line, wherein the positive displacement pump comprises a piston moving in an axial reciprocating motion, and subsequently adjusting operation of the downhole positive displacement pump based on the detected failure mode such that the downhole positive displacement pump piston operates differently in different axial directions.
29 Citations
20 Claims
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1. A method, comprising:
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detecting a failure mode of a fluid flow controller configured to control fluid flow between first and second chambers of a downhole positive displacement pump and a flow line, wherein the positive displacement pump comprises a piston moving in an axial reciprocating motion; and adjusting operation of the downhole positive displacement pump based on the detected failure mode such that the downhole positive displacement pump piston operates differently in different axial directions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method, comprising:
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detecting a clogging of a fluid flow controller in a downhole positive displacement pump that is in a failure mode as a result of being clogged in an open position; and unclogging the fluid flow controller by adjusting an operating rate of the positive displacement pump so that the operating rate of a first stroke of the positive displacement pump is different from the operating rate of a second stroke of the positive displacement pump, resulting in passing fluid through the fluid flow controller at an increased speed, wherein; in the failure mode, the first stroke corresponds to fluid flowing from a flow line through the fluid flow controller into a first chamber of the downhole positive displacement pump; and in the failure mode, the second stroke corresponds to; fluid not flowing from the flow line through the flow controller into a second chamber of the positive displacement pump;
orfluid flowing into the second chamber from an inadvertent source. - View Dependent Claims (19, 20)
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Specification