Apparatus for analysis and control of a reciprocating pump...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science

Reexamination Certificate

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C702S187000, C702S188000, C702S189000

Reexamination Certificate

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08036829

ABSTRACT:
An instrumentation system for assessing operation of a reciprocating pump system which produces hydrocarbons from a non-vertical or a vertical wellbore. The instrumentation system periodically produces a downhole pump card as a function of a directly or indirectly measured surface card and a friction law function from a wave equation which describes the linear vibrations in a long slender rod. A control signal or command signal is generated based on characteristics of the downhole pump card for controlling the pumping system. It also generates a pump and well analysis report that is useful for a pump operation and determination of its condition.

REFERENCES:
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patent: 3343409 (1967-09-01), Gibbs
patent: 5252031 (1993-10-01), Gibbs
patent: 5431230 (1995-07-01), Land et al.
patent: 7212923 (2007-05-01), Gibbs et al.
patent: 2005/0155759 (2005-07-01), Bramlett et al.
International Search Report issued in PCT/US2009/062185, on Dec. 22, 2009.
Xu, J., “A Method for Diagnosing the Performance of Sucker Rod String in Straight Inclined Wells,” Society of Petroleum Engineers International, SPE26970, Tongji University, 1994.
Xu, Jun, “A New Approach to the Analysis of Deviated Rod-Pumped Wells,” Society of Petroleum Engineers International, SPE 28697, Tongji University, 1994.
Dacunha, J. J., “Modelling a Finite-Length Sucker Rod Using the Semi-Infinite Wave Equation and a Proof to Gibbs' Conjecture,” SPE International, SPE 108762, Lufkin Automation, 2007.

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