Method for determining well productivity using automatic downtim

Details Method for determining well productivity using automatic downtim Method for determining well productivity using automatic downtim

1997-08-12

1999-02-16

Tsay, Frank

Wells

Processes

With indicating, testing, measuring or locating

16625002, E21B 4700

Patent

active

058710477

ABSTRACT:
A method is presented to estimate the productivity index, PI, and the well condition, s, of a pumping well utilizing the knowledge of pump runtime versus downtime. Runtime and downtime may be constantly and automatically recorded and transmitted to a central location. A model runtime is computed assuming the two unknowns, PI and s. The model is then compared with the actual runtime data. A nonlinear optimization technique is used to search for the unknown parameters such that the differences between the measured data and the numerically simulated data are minimized in a least-squares fashion. The proposed estimation procedure is an economical and accurate method for monitoring the behavior of a well resevoir system during runtime.

REFERENCES:
patent: 4507055 (1985-03-01), Fair et al.
patent: 5547029 (1996-08-01), Rubbo et al.
patent: 5699246 (1997-12-01), Plasek et al.
L. G. Alexander, "Determination of the Gas-Free Liquid Level and the Annular Gas Flow Rate For a Pumping Well", Apr.-Jun., 1976, The Journal of Canadian Petroleum, pp. 66-70.
James N. McCoy, "Analyzing well performance X", Apr.-Jun., 1978, The Journal of Canadian Petroleum, pp. 80-91.
E. R. Brownscombe, "Afterflows and Buildup Interpretation on Pumping Wells", Feb, 1982, Society of Petroleum Engineers, pp. 397-405.

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